Make a logo with Inkscape
I am not a graphic designer, but I would like to add my own images to the web page I’m going to do. Some months ago I learnt the basics of Inkscape and GIMP, the free software alternatives to Illustrator and Photoshop, so now it’s time to use them for real.
The first thing that I’m going to do is very simple, but also powerful. My friend has a logo that are 2 images combine. I will get some examples from the web and use them as a model to copy the stroke and create my own one.
To achieve this, I will use different layers in Inkscape. In the first and second layer I will put the examples and in the third and fourth layer I will create my own designs. After the copies are done, I will hide the two first layers to have only the final design with the 2 image together (one behind the other).
The first thing that I will do is to import the example image (File-> Import) that will be in the first layer. I will create the second layer and import the second example image. After that, I will go to ‘Layers’ pallet and add 2 more layers, the first one for the image that will be in the background and the last one for the image that will be in the foreground.
For security, the best thing is to lock the layers where I want to draw and when I draw, I have to make sure that the design is done in the correct layer (I have to click in the layer that I want to activate and it will have a different color than the others).
With the Bezier curves tool (Shift+F6) I click around all the stroke until I reach the beginning, then with nodes edition tool (F2) I select all the nodes that I want to smooth and after that, I click in autosmooth the nodes selected (this tool is displayed below the menus in the top when F2 is activated). Finally I have to move and readjust a little the nodes that don’t have the appropiate result until everything is smooth and curved.
After drawing the 2 images and hiding the first 2 layers, I can export the result as png or save it as svg.
I can use this logo with the page title to use it in the cover photo and in the profile picture in social networks. For facebook for example the cover photo is lately saved with the size 828px x 315px and the profile photo with the size 168px x 168px, so exporting as png in Inkscape should have in consideration the final size to have the best resolution. The best thing is to scale the image to the final size before exporting, but also save the svg version to be able to keep working with the logo in Inkscape in the future.


{% extends "layout.html" %} {% block content %}
I have to figure out how this will work
List of common drinks here
custom drink maker


On the first floor of ⊥IW.kilo there is a computer in the southwest corner whose screen is turned on. If we use that computer we'll be transported to a room in ⊥IW.kilo that has a giant Staples Easy button guarded by some size gates.
The room layout is shown below with the size change devices details marked. Note that the Easy button requires a teammate of size XL to step on it.
When we enter this room we are automatically set to size M. In order to have a teammate of size XL reach the Easy button we need a total of 4 teammates to perform the following:
When the Easy button is pressed, it makes the classic "That was easy." sound effect and we complete the field goal, obtaining the answer THINKING OF.


Crystal Collector
INSTRUCTIONS
Click on a crystal to add points
If you match the number, you win
If you surpass the total number, you lose
The values of the crystals are not set
Number To Get
Wins
Losses
Total Score


At least three dead after Oklahoma Walmart shooting
by Jackie SaloThree people were killed in a shooting inside a Walmart in Oklahoma, according to a report.
The shooting occurred just before 10 a.m. Monday at the store in Duncan, about 89 miles south of Oklahoma City, news station KOKH reported.
The suspect was believed to have been at large based off 911 calls — but police later confirmed the person was dead, the Duncan Banner reported.
Nearby schools were placed on lockdown as authorities investigated the fatal shooting, the newspaper said.
The incident comes after 22 people were killed in August at another Walmart in El Paso, Texas in one of the deadliest mass shootings in US history.


Kyulu Jonah
Triangle Tracker
This will decide,
after getting your input 3 times,
whether your triangle
is a
scalene, isosceles, equiangular
or
not a triangle
(two side equal to or are less
than the third side when combined). Refresh the page.


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| PREV NEXT | FRAMES NO FRAMES |
| Classes in com.orm.androrm used by com.orm.androrm | |
|---|---|
| ComposedStatement
This is the abstract superclass of all composed statements. |
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| DatabaseAdapter
This class provides access to the underlying SQLite database. |
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| DatabaseField
This interface has to be implemented by all classes, that will represent fields of the underlying database. |
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| DataField
This class is the superclass for all database fields, that need a real field in the database. |
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| Filter
A Filter is used by Filter Sets
to create complex queries on the database. |
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| FilterSet
Filter Sets are a mechanism, to execute complex queries on the model classes in a very easy manner by using the field names in these classes. |
|
| ForeignKeyField
The foreign key field can be used to build a relation between two models. |
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| JoinStatement
This class is the abstract representation of a JOIN statement. |
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| Limit
Class representing the LIMIT statement of the database. |
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| Model
This is the superclass of all models, that can be stored/ read to/ from the database automatically. |
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| NoSuchFieldException
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| Relation
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| SelectStatement
By utilizing this class you can build complex select statements. |
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| Statement
This class is the superclass of all statements. |
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| TableDefinition
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| Where
Class representing the WHERE clause of the database. |
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| XToManyRelation
This interface has to be implemented by all relations, that point to many other instances. |
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The API is already built for you and not part of the exercise.
However, if you’re interested to learn how to build an API like this you can follow this series of videos: https://aka.ms/NodeBeginner (videos 17 through 21 covers this exact API).
You can also take a look at this interactive tutorial: https://aka.ms/learn/express-api
Make sure you have Node.js installed.
api
folder, then run
npm install
.
npm start
.The server should start listening on port 5000
.
Note: all entries are stored in-memory and are not persisted, so when the server is stopped all data is lost.
| Route | Description |
|---|---|
| GET /api/ | Get server info |
| POST /api/accounts/ |
Create an account, ex:
{ user: 'Yohan', description: 'My budget', currency: 'EUR',
balance: 100 }
|
| GET /api/accounts/:user | Get all data for the specified account |
| DELETE /api/accounts/:user | Remove specified account |
| POST /api/accounts/:user/transactions |
Add a transaction, ex:
{ date: '2020-07-23T18:25:43.511Z', object: 'Bought a book',
amount: -20 }
|
| DELETE /api/accounts/:user/transactions/:id | Remove specified transaction |


Borchester City Council is committed to providing quality housing for all residents and aims to complete a further 400 homes by the end of 2018.
Read more


TUTORTOWN can also help facilitate distance learning by helping home schooled children find appropriate tutors in the subject they need help in. Many home schooled students do not live near major cities and need the help of a tutor via email or the internet. TUTORTOWN offers rewarding marketing opportunities. The site's exploding popularity makes it an excellent advertising site for educational products and services of all types. Join us in the evolution of education. Join TUTORTOWN explore your teaching skills.


| Book of Mormon |
Annotations |
|
Chapter 32
|
This chapter features some of the cognitive biases
encouraged by Mormon instructions on how to learn the truth about LDS
teachings.
The analogy of treating the word of God as a seed may demonstrate how
mindfully practicing a principle may uplift or inspire you, but how do you
think these techniques would work if applied by religions with beliefs that
are mutually exclusive of LDS truth claims?
|
|
1 And it came to pass that they did go forth, and began to
preach the word of God unto the people, entering into their synagogues, and
into their houses; yea, and even they did preach the word in their streets.
|
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|
2 And it came to pass that after much labor among them,
they began to have success among the poor class of people; for behold, they
were cast out of the synagogues because of the coarseness of their apparel—
|
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3 Therefore they were not permitted to enter into their
synagogues to worship God, being esteemed as filthiness; therefore they were
poor; yea, they were esteemed by their brethren as dross; therefore they were
poor as to things of the world; and also they were poor in heart.
|
|
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4 Now, as Alma was teaching and speaking unto the people
upon the hill Onidah, there came a great multitude unto him, who were those
of whom we have been speaking, of whom were poor in heart, because of their
poverty as to the things of the world.
|
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5 And they came unto Alma; and the one who was the
foremost among them said unto him: Behold, what shall these my brethren do,
for they are despised of all men because of their poverty, yea, and more
especially by our priests; for they have cast us out of our synagogues which
we have labored abundantly to build with our own hands; and they have cast us
out because of our exceeding poverty; and we have no place to worship our
God; and behold, what shall we do?
|
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6 And now when Alma heard this, he turned him about, his
face immediately towards him, and he beheld with great joy; for he beheld
that their afflictions had truly humbled them, and that they were in a
preparation to hear the word.
|
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7 Therefore he did say no more to the other multitude; but
he stretched forth his hand, and cried unto those whom he beheld, who were
truly penitent, and said unto them:
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8 I behold that ye are lowly in heart; and if so, blessed
are ye.
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9 Behold thy brother hath said, What shall we do?—for we
are cast out of our synagogues, that we cannot worship our God.
|
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10 Behold I say unto you, do ye suppose that ye cannot
worship God save it be in your synagogues only?
|
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11 And moreover, I would ask, do ye suppose that ye must
not worship God only once in a week?
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12 I say unto you, it is well that ye are cast out of your
synagogues, that ye may be humble, and that ye may learn wisdom; for it is
necessary that ye should learn wisdom; for it is because that ye are cast
out, that ye are despised of your brethren because of your exceeding poverty,
that ye are brought to a lowliness of heart; for ye are necessarily brought
to be humble.
|
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13 And now, because ye are compelled to be humble blessed
are ye; for a man sometimes, if he is compelled to be humble, seeketh
repentance; and now surely, whosoever repenteth shall find mercy; and he that
findeth mercy and endureth to the end the same shall be saved.
|
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14 And now, as I said unto you, that because ye were
compelled to be humble ye were blessed, do ye not suppose that they are more
blessed who truly humble themselves because of the word?
|
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15 Yea, he that truly humbleth himself, and repenteth of
his sins, and endureth to the end, the same shall be blessed—yea, much more
blessed than they who are compelled to be humble because of their exceeding
poverty.
|
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16 Therefore, blessed are they who humble themselves without
being compelled to be humble; or rather, in other words, blessed is he that
believeth in the word of God, and is baptized without stubbornness of heart,
yea, without being brought to know the word, or even compelled to know,
before they will believe.
|
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|
17 Yea, there are many who do say: If thou wilt show unto
us a sign from heaven, then we shall know of a surety; then we shall believe.
|
Alma 32:17-19
Apparently a sign would lead to knowledge, and with knowledge there is no
cause to believe. So a sign must not be the same as evidence because with
sufficient evidence I have cause to believe. For example, the evidence for
the germ theory of disease is overwhelming, so I believe it.
Book of Mormon examples of evidence leading to belief in a good way:
2 Ne 11:4, 6-7 - Nephi’s “soul delighteth in proving unto [his] people the
truth.”
Helaman 5:50 - Prisoners see sons of Helaman, Nephi and Lehi, encircled as if
by fire; see angels; and hear voices. When the prisoners told the Lamanites
about this, “the more part of the Lamanites were convinced of them, because
of the greatness of the evidences.”
We are not to seek after signs, but proof and evidence seems to be good
according to the Book of Mormon, so should we not seek evidence?
|
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18 Now I ask, is this faith? Behold, I say unto you, Nay;
for if a man knoweth a thing he hath no cause to believe, for he knoweth it.
|
Annotation for Alma 32:17-19 above
|
|
19 And now, how much more cursed is he that knoweth the
will of God and doeth it not, than he that only believeth, or only hath cause
to believe, and falleth into transgression?
|
Annotation for Alma 32:17-19 above
|
|
20 Now of this thing ye must judge. Behold, I say unto
you, that it is on the one hand even as it is on the other; and it shall
be unto every man according to his work.
|
If Mormonism is true, and believing that Mormonism is true
is the result of putting enough work into it, then we can always say a person
who fails to believe didn’t work hard enough to believe in Mormonism. This
type of situation is often called a double bind—a situation in which you are
given a choice or dilemma, but there is no good choice. Either way, you fail.
If someone spends what they believe to be sufficient effort to learn whether
the Book of Mormon is what it claims, and they conclude it is not, then
according to this verse, they have not exerted enough effort. The double bind
is that if they fail to put more effort into studying the Book of Mormon,
their conclusion about the Book of Mormon is due to their lack of effort. If
they decide to study the Book of Mormon further, they are likely to think
they are wasting their time.
Consider the effect of Jehovah’s Witness (JW) missionaries teaching a person
their conclusion about the JW Church shall be unto them according to their work,
and that if they put enough work into it, they will reach the “right”
conclusion—that the JW Church is Jehovah’s only authorized organization. What
kind of effect or influence might this have on a person studying with the
Jehovah’s Witnesses?
|
|
21 And now as I said concerning faith—faith is not to have
a perfect knowledge of things; therefore if ye have faith ye hope for things
which are not seen, which are true.
|
Doesn’t this idea of faith work equally well for Islam
which claims Jesus is not a Christ? Does it not work just as well for
Catholicism which claims exclusive apostolic authority?
|
|
22 And now, behold, I say unto you, and I would that ye
should remember, that God is merciful unto all who believe on his name;
therefore he desireth, in the first place, that ye should believe, yea, even
on his word.
|
Encouraging biases - Leveraging desire for social
reciprocity and suggesting reward for belief.
This verse reminds a believer of God’s mercy for
believers. The message is at least two-fold here.
First, a believer is reminded of a debt of gratitude. As a
social being, a believer in God’s mercy will want to reciprocate, so it
primes a believing reader to want to do what the Lord wants, and this verse
says God wants the person to believe what is claimed to be the word of God.
Another message in this verse is that a person who
believes in God will receive God’s mercy (and the obvious
correlate: that a person who does not believe in God will not
receive God’s mercy). If accepted by the reader, this could promote reward
anticipation for belief or fear and guilt for disbelief. All of this, if
believed to some extent, promotes a desire to believe further, hence it
encourages motivated reasoning followed by the blatant admonition to “let
this desire work in you, even until ye believe.” (See Alma 32:27)
|
|
23 And now, he imparteth his word by angels unto men, yea,
not only men but women also. Now this is not all; little children do have
words given unto them many times, which confound the wise and the learned.
|
|
|
24 And now, my beloved brethren, as ye have desired to
know of me what ye shall do because ye are afflicted and cast out—now I do
not desire that ye should suppose that I mean to judge you only according to
that which is true—
|
|
|
25 For I do not mean that ye all of you have been
compelled to humble yourselves; for I verily believe that there are some
among you who would humble themselves, let them be in whatsoever
circumstances they might.
|
|
|
26 Now, as I said concerning faith—that it was not a
perfect knowledge—even so it is with my words. Ye cannot know of their surety
at first, unto perfection, any more than faith is a perfect knowledge.
|
|
|
27 But behold, if ye will awake and arouse your faculties,
even to an experiment upon my words, and exercise a particle of faith,
yea, even if ye can no more than desire to believe, let this desire work
in you, even until ye believe in a manner that ye can give place for a
portion of my words.
|
The use of the word “experiment” may give an impression
that the process described here for developing faith is somehow similar to
the scientific method, but the verses actually encourage something quite
different from a scientific experiment. The scientific method would promote
careful experiments to minimize the effects of biases and help sort through
the facts regardless of which religious claim is investigated. These verses
promote biases that could encourage belief in whatever faith was being
investigated using these principles.
Rather than a scientific experiment, it’s more like being
given a sample of a product, told what the product is supposed to do, and
encouraged to look for anything that might support the claims of the product
manufacturer. It’s like leveraging placebo effect, without control groups, to
convince someone of the product claims rather than looking at the evidence.
The instruction to “let this desire to believe work in
you” is the essence of motivated reasoning (see also Alma 32:22).
“Motivated reasoning refers to the unconscious tendency of individuals to
process information in a manner that suits some end or goal extrinsic to the
formation of accurate beliefs” (Dan Kahan, the Elizabeth K. Dollard Professor
of Law and Professor of Psychology at Yale Law School, “Motivated reasoning & its cognates”).
The danger of motives for reasoning other than getting at the truth is that
it encourages all sorts of biases in favor of supporting the motive, even at
the expense of truth. Motivated reasoning is a sort of catalyst for the
biases. As Yale neurologist Dr. Steven Novella explained, motivated reasoning
“is a catchall covering the suite of biases and cognitive flaws that lead
people to arrive at confident conclusions they wish to be true, rather than
objectively following facts and logic wherever it leads” (“Solution Aversion and Motivated Reasoning”).
What if you took the admonition to desire to believe and
applied it to the teachings of some other religion that claims to be the only
true religion of God? Isn’t the following likely? “People may ultimately come
to believe that the weight of evidence supports the position that they
already wanted to believe was true. And they will believe this without
recognizing that their own desires influenced the evaluation of the evidence”
(Art Markman Ph.D.,  Now, if ye
give place, that a seed may be planted in your heart, behold, if it be a true
seed, or a good seed, if ye do not cast it out by your unbelief, that ye will
resist the Spirit of the Lord, behold, it will begin to swell within your
breasts; and when you feel these swelling motions, ye will begin to say
within yourselves—It must needs be that this is a good seed, or that the word
is good, for it beginneth to enlarge my soul; yea, it beginneth to enlighten
my understanding, yea, it beginneth to be delicious to me.
|
Alma 32:28-35
Yet there are lots of contradictory “seeds” that cause this swelling and
enlightened understanding and that begin to be delicious to their recipients.
Some of these seeds are that Catholicism is the only true religion, others
that only Islam is God’s religion, and yet others that only Mormonism is the
true religion of God. By the explanation in this verse, although they
contradict each other, they are all good “seeds” since many are enlarged and
enlightened by these various, contradictory teachings.
Also, according to these verses, the seed will grow, unless you cast it out
by your unbelief and resistance to the Spirit of the Lord. This teaches that
if you study the Book of Mormon, but do not conclude it is what it claims to
be, you are to blame for casting it out. This type of situation is often
called a double bind—a situation in which you are given a choice or dilemma,
but there is no good choice. Either way, you fail.
If someone studies the Book of Mormon, and they conclude it is not what it
claims, then according to these verses, they cast out the teaching with their
unbelief. The dilemma is that they either stop trying to believe and are
accused of casting out the word, or they continue trying to believe even if
they justifiably think they have done their due diligence.
Consider the effect of Jehovah’s Witness (JW) missionaries teaching a person
they will know the JW Church is Jehovah’s only authorized organization as
long as they don’t cast out the truth of the Jehovah’s Witnesses by their
unbelief. What kind of effect or influence might this have on a person
studying with the Jehovah’s Witnesses?
|
|
29 Now behold, would not this increase your faith? I say
unto you, Yea; nevertheless it hath not grown up to a perfect knowledge.
|
Annotation for Alma 32:28-35 above
|
|
30 But behold, as the seed swelleth, and sprouteth, and
beginneth to grow, then you must needs say that the seed is good; for behold
it swelleth, and sprouteth, and beginneth to grow. And now, behold, will not
this strengthen your faith? Yea, it will strengthen your faith: for ye will
say I know that this is a good seed; for behold it sprouteth and beginneth to
grow.
|
Annotation for Alma 32:28-35 above
|
|
31 And now, behold, are ye sure that this is a good seed?
I say unto you, Yea; for every seed bringeth forth unto its own likeness.
|
Annotation for Alma 32:28-35 above
|
|
32 Therefore, if a seed groweth it is good, but if it
groweth not, behold it is not good, therefore it is cast away.
|
Annotation for Alma 32:28-35 above
|
|
33 And now, behold, because ye have tried the experiment,
and planted the seed, and it swelleth and sprouteth, and beginneth to grow,
ye must needs know that the seed is good.
|
Annotation for Alma 32:28-35 above
|
|
34 And now, behold, is your knowledge perfect? Yea, your
knowledge is perfect in that thing, and your faith is dormant; and this
because you know, for ye know that the word hath swelled your souls, and ye
also know that it hath sprouted up, that your understanding doth begin to be
enlightened, and your mind doth begin to expand.
|
Annotation for Alma 32:28-35 above
Also, consider the reasoning in verse 34. If your knowledge is perfect in a
thing, your faith is dormant in that thing. If you know beyond a shadow of a
doubt that Jesus is the Christ, then, by the reasoning of this verse, is your
faith in Christ not dormant?
|
|
35 O then, is not this real? I say unto you, Yea, because
it is light; and whatsoever is light, is good, because it is discernible,
therefore ye must know that it is good; and now behold, after ye have tasted
this light is your knowledge perfect?
|
Annotation for Alma 32:28-35 above
|
|
36 Behold I say unto you, Nay; neither must ye lay aside
your faith, for ye have only exercised your faith to plant the seed that ye
might try the experiment to know if the seed was good.
|
|
|
37 And behold, as the tree beginneth to grow, ye will say:
Let us nourish it with great care, that it may get root, that it may grow up,
and bring forth fruit unto us. And now behold, if ye nourish it with much
care it will get root, and grow up, and bring forth fruit.
|
The more care you provide a seed of any tree, the more
likely a tree will sprout from it. If a person takes care of the word as
taught by Catholicism, Hinduism, Scientology, etc. in this way, isn’t it more
likely the person will end up believing the religion they are studying is the
only true religion?
|
|
38 But if ye neglect the tree, and take no thought for its
nourishment, behold it will not get any root; and when the heat of the sun
cometh and scorcheth it, because it hath no root it withers away, and ye
pluck it up and cast it out.
|
Alma 32:38-40
According to these verses, if the seed withers, it could be because of your
neglect or because your ground was barren. This teaches that if you study the
Book of Mormon, but do not conclude it is what it claims to be, you are to
blame for your neglect or your barren ground (unfit heart?). This type of
situation is often called a double bind—a situation in which you are given a
choice or dilemma, but there is no good choice. Either way, you fail.
If someone studies the Book of Mormon, and they conclude it is not what it
claims, then according to these verses, the seed did not grow because of
neglect or barren ground. The dilemma is that they either stop trying to
believe and are accused of neglect or barren ground, or they continue trying
to believe even if they justifiably think they have already done their due
diligence.
Consider the effect of Jehovah’s Witness (JW) missionaries teaching a person
they will know the JW Church is Jehovah’s only authorized organization as
long as they don’t neglect the JW teachings or have barren ground. What kind
of effect or influence might this have on a person studying with the Jehovah’s
Witnesses?
|
|
39 Now, this is not because the seed was not good, neither
is it because the fruit thereof would not be desirable; but it is because
your ground is barren, and ye will not nourish the tree, therefore ye cannot
have the fruit thereof.
|
Annotation for Alma 32:38-40 above
|
|
40 And thus, if ye will not nourish the word, looking
forward with an eye of faith to the fruit thereof, ye can never pluck of the
fruit of the tree of life.
|
Annotation for Alma 32:38-40 above
|
|
41 But if ye will nourish the word, yea, nourish the tree
as it beginneth to grow, by your faith with great diligence, and with
patience, looking forward to the fruit thereof, it shall take root; and
behold it shall be a tree springing up unto everlasting life.
|
Alma 32:41-43
The more care you provide a seed or seedling of any tree, the more likely a
tree will sprout and grow to provide some benefit. If a person takes care of
the word as taught by Catholicism, Hinduism, Scientology, etc. in this way,
isn’t it more likely the person will end up believing the religion they are
studying is God’s only sanctioned religion?
|
|
42 And because of your diligence and your faith and your
patience with the word in nourishing it, that it may take root in you,
behold, by and by ye shall pluck the fruit thereof, which is most precious,
which is sweet above all that is sweet, and which is white above all that is
white, yea, and pure above all that is pure; and ye shall feast upon this
fruit even until ye are filled, that ye hunger not, neither shall ye thirst.
|
Annotation for Alma 32:41-43 above
|
|
43 Then, my brethren, ye shall reap the rewards of your
faith, and your diligence, and patience, and long-suffering, waiting for the
tree to bring forth fruit unto you.
|
Annotation for Alma 32:41-43 above
|


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Working with electrical equipment can be dangerous if not used properly. Because electrical hardware has played a large role in our project, we thoroughly educated users on safety within the lab. It is essential to ensure that wires are protected and electrical circuits are not exposed to liquid, especially since liquid cultures are vital to the setup. Improper care around electrical devices could cause serious injury.
The device contains glass, which could break and harm the user if the setup were knocked over. Therefore, the setup must be kept away from potentially hazardous objects on a flat and dry surface. The surrounding area must be kept clean and free of clutter. Our lab members have been trained in clean-up protocols for broken glass and liquid spills.
While biological waste like E. coli, genetically engineered yeast, and synthetic media pose only a small risk to humans, animals, and the environment, it is still important to keep these items contained during use and waste disposal. Biological waste and media are bleached and and waste bags are autoclaved before disposal in order to prevent their release into the environment.
While Violacein and its related forms have not fully been investigated, they have been declared non-hazardous according to Regulation (EC) No 1272/2008. ("Violacein 548-54-9 MSDS, Safety Technical Specifications _ MSDS").
As we move forward with our automated culture system, user safety protocols will be developed to ensure proper operation by manufacturers who implement our system in their bioprocesses.
What risks does your project pose at the laboratory stage? What actions are you taking to reduce those risks?
Our project is BioSafety Level 1. We work with common lab strains of yeast and E. coli, which are kept in closed containers and always handled with gloves. Closed-toe shoes are required in our lab. We autoclave all biohazard waste. When running gel electrophoresis, we use Sybr Safe, which is a mutagen. To minimize exposure, we wear gloves and work in a contained space (fume hood) and use equipment that is not used for other experiments. Chloroform is occasionally used in a hood to contain fumes.
What risks might your project pose, if it were fully developed into a real product that real people could use? What future work might you do to reduce those risks?
If developed into a commercial product, engineered yeast could be released into the environment, with unknown consequences. Although we expect that our yeast would pose no health threat, environmental risk could be minimized by the addition of a genetic killswitch into our system.
Do the biological materials used in your lab work pose any of the following risks?
A. Risks to the safety and health of team members or others working in the lab?
Using E. coli poses a potential risk to the health and safety of our team members working in the lab if it is handled improperly or consumed. It may cause irritation to skin, eyes, and respiratory tract and may adversely affect kidneys.
Using Sybr Safe and Ethidium Bromide to make gels poses health risks because both chemicals are mutagens.
B. Risks to the safety and health of the general public, if released by design or by accident?
The risks to the safety and health of the general public are the same as those for individuals directly working with these biological materials.
C. Risks to the environment, if released by design or by accident?
Sybr Safe and Ethidium Bromide both cause risks to the environment because they are both mutagens.
D. Risks to security through malicious misuse by individuals, groups, or countries?
There is slight concern for the misuse of our systems, since any gene could be substituted in place of the existing outputs.
What safety training have you received (or plan to receive in the future)? Provide a brief description, and a link to your institution's safety training requirements, if available.
All students working in lab have completed online courses in biosafety, chemical safety, fire extinguisher safety, globally harmonized system, and electrical safety as required by the University of Washington and administered by our department of Environmental Health and Safety. All student members of our team have been trained by student advisers during in-person safety orientations in our labspace, which covered fire and earthquake safety, chemical spills, locations of safety equipment, autoclave safety, waste disposal rules, and personal protective equipment. Our team leadership also ran extensive lab training that covered sterile technique and basic protocols. Advisers have been trained by their respective labs in accordance with the University of Washington Environmental Health and Safety Committee's regulations. Regular EH&S inspections ensure that the lab is up to university lab standards.
Under what biosafety provisions will/do you work?
A. Please provide a link to your institution biosafety guidelines.
Environmental Health and Safety at the University of Washington
B. Does your institution have an Institutional Biosafety Committee, or an equivalent group? If yes, have you discussed your project with them?
The University of Washington Environmental Health and Safety (UW EHS) committee determines biosafety regulations and guidelines for all labs associated with our campus. We have not discussed this specific iGEM project with members of the EHS committee; however, we are working closely with our sponsor labs and have been trained according to the guidelines which they follow.
C. Does your country have national biosafety regulations or guidelines? If so, please provide a link to these regulations or guidelines if possible?
The United States of America has national biosafety regulations and guidelines determined by the Centers for Disease Control and Prevention (CDC). Specifics about their guidelines can be found on their biosafety page.
D. Does your country have national biosafety regulations or guidelines? If so, please provide a link to these regulations or guidelines if possible?
The United States of America has national biosafety regulations and guidelines determined by the Centers for Disease Control and Prevention (CDC). Specifics about their guidelines can be found on their biosafety page.
E. According to the WHO Biosafety Manual, what is the BioSafety Level rating of your lab?
The BioSafety Level of our lab is category 2. The lab room used is equipped to deal with category 2 hazards; for example, it contains a fume hood. However, for this project, only category 1 cells were used; namely, non-pathogenic E. coli and yeast.


#include <array_ops.h>
Splits a tensor into num_split
tensors along one dimension.
Arguments:
[-rank(value), rank(value))
.Returns:
OutputList
: Tensors whose shape matches that of value
except along axis
, where their sizes are size_splits[i]
.
Constructors and Destructors |
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|---|---|
SplitV(const ::tensorflow::Scope & scope, ::tensorflow::Input value, ::tensorflow::Input size_splits, ::tensorflow::Input axis, int64 num_split)
|
Public attributes |
|
|---|---|
operation
|
|
output
|
Public functions |
|
|---|---|
operator[](size_t index) const
|
Operation operation
::tensorflow::OutputList output
SplitV( const ::tensorflow::Scope & scope, ::tensorflow::Input value, ::tensorflow::Input size_splits, ::tensorflow::Input axis, int64 num_split )
::tensorflow::Output operator[]( size_t index ) const


Introduction
This is the post explaining my third work term at Arctic Wolf Networks in Waterloo. This was my third co-op and my first real introduction to being a developer in a professional environment. This post should help you see what I learned and how I grew as a developer over the 4 months I was there.
Employer Info
Arctic Wolf Networks is Cyber Security company that offers SOC (Security Operations Center) as a Service. They collect logs, packets, and other data, analyze this data and then provide it to a Security Engineer to take a look at. They are currently a company of ~250 people but are quickly growing. All of R&D is based out of Waterloo, but they also have employees in California, Utah, and in Minnesota.
Job Description
I was hired as a software developer and was placed on two different teams, Lümberjacks and The Precogs. My duties on both teams were pretty similar, I wrote and updated parsers for different log lines we recieved from customers. Some of my other duties involved creating summary reports of important events that were given to customers weekly.
The beginning of the work term went smoothly, as onboarding took less than a week. I was actively contributing within a week of starting work. The first few weeks were all about coming up to speed with parsing using Python at Arctic Wolf. I learned about Grok patterns and learned a lot more Regex. For the first sprint I was just fixing simple parser errors but after that I got to do some more interesting things.
After the first sprint, the two teams felt like I was ready to start taking on harder problems such as writing new parsers from scratch. This was much more interesting, as I got to look into log lines, find the valuable security information within them and parse it into a JSON object to be later put into Elastic Search for the Security Engineers to look at. I learned a lot about both techniques for parsing and about security from doing this.
My final big project was to write a parser for a log source which was a log collection agent. The log source sent us lots of different kinds of log lines and the parser needed to find out which log line was which and successfully parse each line. This originally was expected to take 2 sprints (~6 weeks) due to the ocmplexity of the task. I felt as if this should not take this long and ended up solving this problem in only one week, impressing everyone at the company which made me feel amazing.
Overall, I enjoyed the work term and found parsing to be an interesting challenge to take on, although I would not like to do another work term of parsing.
Goals
For this work term, I had 3 main goals I wished to accomplish. My first goal was to become more comfortable and proficient with my oral communication skills in larger groups of people. My second goal was to more thoughroughly understand how software development happens in the industry, such as procedures, technologies etc. My final goal was to learn to when to ask questions when I am stuck versus working through it myself.
My first goal for the term was to become more comfortable and proficient with my oral communication skills. To accomplish this goal, I made sure to do my best to speak up in meetings when I felt I had something to contribuate, and went out of my way to volunteer to run meetings when it was needed. The first few meetings I ran I felt nervous and awkward but over time I felt comfortable. The more I ran meetings and spoke up in meetings the more I felt like I was contributing to the team. Overall, I feel like I achieved this goal.
My second goal for the work term was to gain a better understanding of the processes and technologies used in the industry. Throughout the term I learned more and more about the processes and the technology used in the industry, especially around Python. I learned about chef, Jenkins, AWS and GitHub. I learned about the agile development process and how it is used effectively. This was very useful as I am in Computer Science and have not taken the Software Engineering courses that teach this in school. Overall I feel like I achieved this goal and I became fully comforatable with these new processes and technologies.
My final goal for the term was to learn when to ask questions versus solving the problem myself. This has been an issue for me in the past, as I would often sit at my desk stuck on a problem for days because I felt like I should be able to solve it, when it could have only taken 5 minutes if I had asked a question sooner. This term I went out of my way to really think about when to ask for assistance versus when to solve the problem myself, and I feel like I did this effectively. Everyone on my team was impressed by how quickly I was getting things done due to me figuring out when to ask questions. I am happy to say that I accomplished this goal, and it greatly helped me throughout the term.
Conclusion
Arctic Wolf Networks was my first real development based co-op and I learned so much from it. Everyone on both teams I worked on were nice and super supportive and really helped me along my way. Arctic Wolf as a company is amazing, full of really smart, nice people. The culture is incredible, the managers are amazing and the office space is really nice. I am happy to say that I will be returning to Arctic Wolf for my next co-op term, working on a new team and continuing to learn all about new technologies.
Acknowledgments
To begin, I'd like to thank both teams I worked for over the summer. Both teams were very friendly and supportive as I came up to speed and made me feel welcome.
I'd like to thank my manager Jen who helped me come up to speed and feel welcome. Jen was an amazing manager and I would love to work under her again. Jen also helped me find a job on a new team for the future work term which I am very grateful for.
I'd also like to thank Matt and Akshay who both helped mentor me throughout the term. Matt was my official mentor and was always there with advice and help when I needed it. Akshay was not officially a mentor but was on the two teams I was on and taught me lots about parsers.
Finally, I'd like to thank Ray who is taking a chance and offered me a job on his team for the Winter and Summer. I am very excited to work under him and to continue to learn.


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|
PX4 Firmware
PX4 Autopilot Software http://px4.io
|
#include <parameters/param.h>
Go to the source code of this file.
Functions | |
| PARAM_DEFINE_FLOAT (LPE_FLW_OFF_Z, 0.0f) | |
| Optical flow z offset from center. More... | |
| PARAM_DEFINE_FLOAT (LPE_FLW_SCALE, 1.3f) | |
| Optical flow scale. More... | |
| PARAM_DEFINE_FLOAT (LPE_FLW_R, 7.0f) | |
| Optical flow rotation (roll/pitch) noise gain. More... | |
| PARAM_DEFINE_FLOAT (LPE_FLW_RR, 7.0f) | |
| Optical flow angular velocity noise gain. More... | |
| PARAM_DEFINE_INT32 (LPE_FLW_QMIN, 150) | |
| Optical flow minimum quality threshold. More... | |
| PARAM_DEFINE_FLOAT (LPE_SNR_Z, 0.05f) | |
| Sonar z standard deviation. More... | |
| PARAM_DEFINE_FLOAT (LPE_SNR_OFF_Z, 0.00f) | |
| Sonar z offset from center of vehicle +down. More... | |
| PARAM_DEFINE_FLOAT (LPE_LDR_Z, 0.03f) | |
| Lidar z standard deviation. More... | |
| PARAM_DEFINE_FLOAT (LPE_LDR_OFF_Z, 0.00f) | |
| Lidar z offset from center of vehicle +down. More... | |
| PARAM_DEFINE_FLOAT (LPE_ACC_XY, 0.012f) | |
| Accelerometer xy noise density. More... | |
| PARAM_DEFINE_FLOAT (LPE_ACC_Z, 0.02f) | |
| Accelerometer z noise density. More... | |
| PARAM_DEFINE_FLOAT (LPE_BAR_Z, 3.0f) | |
| Barometric presssure altitude z standard deviation. More... | |
| PARAM_DEFINE_FLOAT (LPE_GPS_DELAY, 0.29f) | |
| GPS delay compensaton. More... | |
| PARAM_DEFINE_FLOAT (LPE_GPS_XY, 1.0f) | |
| Minimum GPS xy standard deviation, uses reported EPH if greater. More... | |
| PARAM_DEFINE_FLOAT (LPE_GPS_Z, 3.0f) | |
| Minimum GPS z standard deviation, uses reported EPV if greater. More... | |
| PARAM_DEFINE_FLOAT (LPE_GPS_VXY, 0.25f) | |
| GPS xy velocity standard deviation. More... | |
| PARAM_DEFINE_FLOAT (LPE_GPS_VZ, 0.25f) | |
| GPS z velocity standard deviation. More... | |
| PARAM_DEFINE_FLOAT (LPE_EPH_MAX, 3.0f) | |
| Max EPH allowed for GPS initialization. More... | |
| PARAM_DEFINE_FLOAT (LPE_EPV_MAX, 5.0f) | |
| Max EPV allowed for GPS initialization. More... | |
| PARAM_DEFINE_FLOAT (LPE_VIS_DELAY, 0.1f) | |
| Vision delay compensaton. More... | |
| PARAM_DEFINE_FLOAT (LPE_VIS_XY, 0.1f) | |
| Vision xy standard deviation. More... | |
| PARAM_DEFINE_FLOAT (LPE_VIS_Z, 0.5f) | |
| Vision z standard deviation. More... | |
| PARAM_DEFINE_FLOAT (LPE_VIC_P, 0.001f) | |
| Vicon position standard deviation. More... | |
| PARAM_DEFINE_FLOAT (LPE_PN_P, 0.1f) | |
| Position propagation noise density. More... | |
| PARAM_DEFINE_FLOAT (LPE_PN_V, 0.1f) | |
| Velocity propagation noise density. More... | |
| PARAM_DEFINE_FLOAT (LPE_PN_B, 1e-3f) | |
| Accel bias propagation noise density. More... | |
| PARAM_DEFINE_FLOAT (LPE_PN_T, 0.001f) | |
| Terrain random walk noise density, hilly/outdoor (0.1), flat/Indoor (0.001) More... | |
| PARAM_DEFINE_FLOAT (LPE_T_MAX_GRADE, 1.0f) | |
| Terrain maximum percent grade, hilly/outdoor (100 = 45 deg), flat/Indoor (0 = 0 deg) Used to calculate increased terrain random walk nosie due to movement. More... | |
| PARAM_DEFINE_FLOAT (LPE_FGYRO_HP, 0.001f) | |
| Flow gyro high pass filter cut off frequency. More... | |
| PARAM_DEFINE_INT32 (LPE_FAKE_ORIGIN, 0) | |
| Enable publishing of a fake global position (e.g for AUTO missions using Optical Flow) by initializing the estimator to the LPE_LAT/LON parameters when global information is unavailable. More... | |
| PARAM_DEFINE_FLOAT (LPE_LAT, 47.397742f) | |
| Local origin latitude for nav w/o GPS. More... | |
| PARAM_DEFINE_FLOAT (LPE_LON, 8.545594) | |
| Local origin longitude for nav w/o GPS. More... | |
| PARAM_DEFINE_FLOAT (LPE_X_LP, 5.0f) | |
| Cut frequency for state publication. More... | |
| PARAM_DEFINE_FLOAT (LPE_VXY_PUB, 0.3f) | |
| Required velocity xy standard deviation to publish position. More... | |
| PARAM_DEFINE_FLOAT (LPE_Z_PUB, 1.0f) | |
| Required z standard deviation to publish altitude/ terrain. More... | |
| PARAM_DEFINE_FLOAT (LPE_LAND_Z, 0.03f) | |
| Land detector z standard deviation. More... | |
| PARAM_DEFINE_FLOAT (LPE_LAND_VXY, 0.05f) | |
| Land detector xy velocity standard deviation. More... | |
| PARAM_DEFINE_FLOAT (LPE_LT_COV, 0.0001f) | |
| Minimum landing target standard covariance, uses reported covariance if greater. More... | |
| PARAM_DEFINE_INT32 (LPE_FUSION, 145) | |
| Integer bitmask controlling data fusion. More... | |
| PARAM_DEFINE_FLOAT | ( | LPE_FLW_OFF_Z | , |
| 0. | 0f | ||
| ) |
Optical flow z offset from center.
Local Position Estimator m -1 1 3
| PARAM_DEFINE_FLOAT | ( | LPE_FLW_SCALE | , |
| 1. | 3f | ||
| ) |
Optical flow scale.
Local Position Estimator m 0.1 10.0 3
| PARAM_DEFINE_FLOAT | ( | LPE_FLW_R | , |
| 7. | 0f | ||
| ) |
Optical flow rotation (roll/pitch) noise gain.
Local Position Estimator m/s / (rad) 0.1 10.0 3
| PARAM_DEFINE_FLOAT | ( | LPE_FLW_RR | , |
| 7. | 0f | ||
| ) |
Optical flow angular velocity noise gain.
Local Position Estimator m/s / (rad/s) 0.0 10.0 3
| PARAM_DEFINE_FLOAT | ( | LPE_SNR_Z | , |
| 0. | 05f | ||
| ) |
Sonar z standard deviation.
Local Position Estimator m 0.01 1 3
| PARAM_DEFINE_FLOAT | ( | LPE_SNR_OFF_Z | , |
| 0. | 00f | ||
| ) |
Sonar z offset from center of vehicle +down.
Local Position Estimator m -1 1 3
| PARAM_DEFINE_FLOAT | ( | LPE_LDR_Z | , |
| 0. | 03f | ||
| ) |
Lidar z standard deviation.
Local Position Estimator m 0.01 1 3
| PARAM_DEFINE_FLOAT | ( | LPE_LDR_OFF_Z | , |
| 0. | 00f | ||
| ) |
Lidar z offset from center of vehicle +down.
Local Position Estimator m -1 1 3
| PARAM_DEFINE_FLOAT | ( | LPE_ACC_XY | , |
| 0. | 012f | ||
| ) |
Accelerometer xy noise density.
Data sheet noise density = 150ug/sqrt(Hz) = 0.0015 m/s^2/sqrt(Hz)
Larger than data sheet to account for tilt error.
Local Position Estimator m/s^2/sqrt(Hz) 0.00001 2 4
| PARAM_DEFINE_FLOAT | ( | LPE_ACC_Z | , |
| 0. | 02f | ||
| ) |
Accelerometer z noise density.
Data sheet noise density = 150ug/sqrt(Hz) = 0.0015 m/s^2/sqrt(Hz)
Local Position Estimator m/s^2/sqrt(Hz) 0.00001 2 4
| PARAM_DEFINE_FLOAT | ( | LPE_BAR_Z | , |
| 3. | 0f | ||
| ) |
Barometric presssure altitude z standard deviation.
Local Position Estimator m 0.01 100 2
| PARAM_DEFINE_FLOAT | ( | LPE_GPS_DELAY | , |
| 0. | 29f | ||
| ) |
GPS delay compensaton.
Local Position Estimator sec 0 0.4 2
| PARAM_DEFINE_FLOAT | ( | LPE_GPS_XY | , |
| 1. | 0f | ||
| ) |
Minimum GPS xy standard deviation, uses reported EPH if greater.
Local Position Estimator m 0.01 5 2
| PARAM_DEFINE_FLOAT | ( | LPE_GPS_Z | , |
| 3. | 0f | ||
| ) |
Minimum GPS z standard deviation, uses reported EPV if greater.
Local Position Estimator m 0.01 200 2
| PARAM_DEFINE_FLOAT | ( | LPE_GPS_VXY | , |
| 0. | 25f | ||
| ) |
GPS xy velocity standard deviation.
EPV used if greater than this value.
Local Position Estimator m/s 0.01 2 3
| PARAM_DEFINE_FLOAT | ( | LPE_GPS_VZ | , |
| 0. | 25f | ||
| ) |
GPS z velocity standard deviation.
Local Position Estimator m/s 0.01 2 3
| PARAM_DEFINE_FLOAT | ( | LPE_EPH_MAX | , |
| 3. | 0f | ||
| ) |
Max EPH allowed for GPS initialization.
Local Position Estimator m 1.0 5.0 3
| PARAM_DEFINE_FLOAT | ( | LPE_EPV_MAX | , |
| 5. | 0f | ||
| ) |
Max EPV allowed for GPS initialization.
Local Position Estimator m 1.0 5.0 3
| PARAM_DEFINE_FLOAT | ( | LPE_VIS_DELAY | , |
| 0. | 1f | ||
| ) |
Vision delay compensaton.
Set to zero to enable automatic compensation from measurement timestamps
Local Position Estimator sec 0 0.1 2
| PARAM_DEFINE_FLOAT | ( | LPE_VIS_XY | , |
| 0. | 1f | ||
| ) |
Vision xy standard deviation.
Local Position Estimator m 0.01 1 3
| PARAM_DEFINE_FLOAT | ( | LPE_VIS_Z | , |
| 0. | 5f | ||
| ) |
Vision z standard deviation.
Local Position Estimator m 0.01 100 3
| PARAM_DEFINE_FLOAT | ( | LPE_VIC_P | , |
| 0. | 001f | ||
| ) |
Vicon position standard deviation.
Local Position Estimator m 0.0001 1 4
| PARAM_DEFINE_FLOAT | ( | LPE_PN_P | , |
| 0. | 1f | ||
| ) |
Position propagation noise density.
Increase to trust measurements more. Decrease to trust model more.
Local Position Estimator m/s/sqrt(Hz) 0 1 8
| PARAM_DEFINE_FLOAT | ( | LPE_PN_V | , |
| 0. | 1f | ||
| ) |
Velocity propagation noise density.
Increase to trust measurements more. Decrease to trust model more.
Local Position Estimator (m/s)/s/sqrt(Hz) 0 1 8
| PARAM_DEFINE_FLOAT | ( | LPE_PN_B | , |
| 1e- | 3f | ||
| ) |
Accel bias propagation noise density.
Local Position Estimator (m/s^2)/s/sqrt(Hz) 0 1 8
| PARAM_DEFINE_FLOAT | ( | LPE_PN_T | , |
| 0. | 001f | ||
| ) |
Terrain random walk noise density, hilly/outdoor (0.1), flat/Indoor (0.001)
Local Position Estimator (m/s)/(sqrt(hz)) 0 1 3
| PARAM_DEFINE_FLOAT | ( | LPE_T_MAX_GRADE | , |
| 1. | 0f | ||
| ) |
Terrain maximum percent grade, hilly/outdoor (100 = 45 deg), flat/Indoor (0 = 0 deg) Used to calculate increased terrain random walk nosie due to movement.
Local Position Estimator % 0 100 3
| PARAM_DEFINE_FLOAT | ( | LPE_FGYRO_HP | , |
| 0. | 001f | ||
| ) |
Flow gyro high pass filter cut off frequency.
Local Position Estimator Hz 0 2 3
| PARAM_DEFINE_FLOAT | ( | LPE_LAT | , |
| 47. | 397742f | ||
| ) |
Local origin latitude for nav w/o GPS.
Local Position Estimator deg -90 90 8
| PARAM_DEFINE_FLOAT | ( | LPE_LON | , |
| 8. | 545594 | ||
| ) |
Local origin longitude for nav w/o GPS.
Local Position Estimator deg -180 180 8
| PARAM_DEFINE_FLOAT | ( | LPE_X_LP | , |
| 5. | 0f | ||
| ) |
Cut frequency for state publication.
Local Position Estimator Hz 5 1000 0
| PARAM_DEFINE_FLOAT | ( | LPE_VXY_PUB | , |
| 0. | 3f | ||
| ) |
Required velocity xy standard deviation to publish position.
Local Position Estimator m/s 0.01 1.0 3
| PARAM_DEFINE_FLOAT | ( | LPE_Z_PUB | , |
| 1. | 0f | ||
| ) |
Required z standard deviation to publish altitude/ terrain.
Local Position Estimator m 0.3 5.0 1
| PARAM_DEFINE_FLOAT | ( | LPE_LAND_Z | , |
| 0. | 03f | ||
| ) |
Land detector z standard deviation.
Local Position Estimator m 0.001 10.0 3
| PARAM_DEFINE_FLOAT | ( | LPE_LAND_VXY | , |
| 0. | 05f | ||
| ) |
Land detector xy velocity standard deviation.
Local Position Estimator m/s 0.01 10.0 3
| PARAM_DEFINE_FLOAT | ( | LPE_LT_COV | , |
| 0. | 0001f | ||
| ) |
Minimum landing target standard covariance, uses reported covariance if greater.
Local Position Estimator m^2 0.0 10 2
| PARAM_DEFINE_INT32 | ( | LPE_FLW_QMIN | , |
| 150 | |||
| ) |
Optical flow minimum quality threshold.
Local Position Estimator 0 255 0
| PARAM_DEFINE_INT32 | ( | LPE_FAKE_ORIGIN | , |
| 0 | |||
| ) |
Enable publishing of a fake global position (e.g for AUTO missions using Optical Flow) by initializing the estimator to the LPE_LAT/LON parameters when global information is unavailable.
Local Position Estimator 0 1
| PARAM_DEFINE_INT32 | ( | LPE_FUSION | , |
| 145 | |||
| ) |
Integer bitmask controlling data fusion.
Set bits in the following positions to enable: 0 : Set to true to fuse GPS data if available, also requires GPS for altitude init 1 : Set to true to fuse optical flow data if available 2 : Set to true to fuse vision position 3 : Set to true to enable landing target 4 : Set to true to fuse land detector 5 : Set to true to publish AGL as local position down component 6 : Set to true to enable flow gyro compensation 7 : Set to true to enable baro fusion
default (145 - GPS, baro, land detector)
Local Position Estimator 0 255 0 fuse GPS, requires GPS for alt. init 1 fuse optical flow 2 fuse vision position 3 fuse landing target 4 fuse land detector 5 pub agl as lpos down 6 flow gyro compensation 7 fuse baro


Tara O'Shea, Rebecca Moore and Carlos Souza on NextGenMap and forest monitoring
On a panel moderated by Tara O'Shea (Planet), Rebecca Moore (Google) and Carlos Souza (Imazon) converse about NextGenMap's ability to revolutionize our abilities to monitor forests. Historically, monitoring forests and land-use change has involved a compromise between the resolution and frequency of available satellite images and limited computing capacity for analysis. Recent developments in satellite imagery, machine learning and land use classification offer new opportunities to disrupt these limitations. NexGenMap is an R&D effort to leverage these developments to monitor forests and land use to sustain our world's most important terrestrial carbon sinks.


a tree structure of bodies connected by joints that is treated as a unit by the dynamics solver
More...
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| virtual void | release ()=0 |
| | Releases the PxBase instance, please check documentation of release in derived class. More...
|
| |
| virtual void | setArticulationFlags (PxArticulationFlags flags)=0 |
| | Sets flags on the articulation. More...
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| |
| virtual void | setArticulationFlag (PxArticulationFlag::Enum flag, bool value)=0 |
| | Raises or clears a flag on the articulation. More...
|
| |
| virtual PxArticulationFlags | getArticulationFlags () const =0 |
| | return PxArticulationFlags More...
|
| |
| virtual PxU32 | getDofs () const =0 |
| | returns the total Dofs of the articulation More...
|
| |
| virtual PxArticulationCache * | createCache () const =0 |
| | create an articulation cache More...
|
| |
| virtual PxU32 | getCacheDataSize () const =0 |
| | Get the size of the articulation cache. More...
|
| |
| virtual void | zeroCache (PxArticulationCache &cache)=0 |
| | zero all data in the articulation cache beside the cache version More...
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| |
| virtual void | applyCache (PxArticulationCache &cache, const PxArticulationCacheFlags flag, bool autowake=true)=0 |
| | apply the user defined data in the cache to the articulation system More...
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| |
| virtual void | copyInternalStateToCache (PxArticulationCache &cache, const PxArticulationCacheFlags flag) const =0 |
| | copy the internal data of the articulation to the cache More...
|
| |
| virtual void | releaseCache (PxArticulationCache &cache) const =0 |
| | release an articulation cache More...
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| |
| virtual void | packJointData (const PxReal *maximum, PxReal *reduced) const =0 |
| | reduce the maximum data format to the reduced internal data More...
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| |
| virtual void | unpackJointData (const PxReal *reduced, PxReal *maximum) const =0 |
| | turn the reduced internal data to maximum joint data format More...
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| |
| virtual void | commonInit () const =0 |
| | initialize all the common data for inverse dynamics More...
|
| |
| virtual void | computeGeneralizedGravityForce (PxArticulationCache &cache) const =0 |
| | determine the statically balance of the joint force of gravity for entire articulation. External force, joint velocity and joint acceleration are set to zero, the joint force returned will be purely determined by gravity. More...
|
| |
| virtual void | computeCoriolisAndCentrifugalForce (PxArticulationCache &cache) const =0 |
| | determine coriolise and centrifugal force. External force, gravity and joint acceleration are set to zero, the joint force return will be coriolise and centrifugal force for each joint. More...
|
| |
| virtual void | computeGeneralizedExternalForce (PxArticulationCache &cache) const =0 |
| | determine joint force change caused by external force. Gravity, joint acceleration and joint velocity are all set to zero. More...
|
| |
| virtual void | computeJointAcceleration (PxArticulationCache &cache) const =0 |
| | determine the joint acceleration for each joint This is purely calculates the change in joint acceleration due to change in the joint force More...
|
| |
| virtual void | computeJointForce (PxArticulationCache &cache) const =0 |
| | determine the joint force This is purely calculates the change in joint force due to change in the joint acceleration This means gravity and joint velocity will be zero More...
|
| |
| virtual void | computeDenseJacobian (PxArticulationCache &cache, PxU32 &nRows, PxU32 &nCols) const =0 |
| | compute the dense Jacobian for the entire articulation in world space More...
|
| |
| virtual void | computeCoefficientMatrix (PxArticulationCache &cache) const =0 |
| | compute the coefficient matrix for contact force. More...
|
| |
| virtual bool | computeLambda (PxArticulationCache &cache, PxArticulationCache &initialState, const PxReal *const jointTorque, const PxU32 maxIter) const =0 |
| | compute the lambda value when the test impulse is 1 More...
|
| |
| virtual void | computeGeneralizedMassMatrix (PxArticulationCache &cache) const =0 |
| | compute the joint-space inertia matrix More...
|
| |
| virtual void | addLoopJoint (PxJoint *joint)=0 |
| | add loop joint to the articulation system for inverse dynamic More...
|
| |
| virtual void | removeLoopJoint (PxJoint *joint)=0 |
| | remove loop joint from the articulation system More...
|
| |
| virtual PxU32 | getNbLoopJoints () const =0 |
| | returns the number of loop joints in the articulation More...
|
| |
| virtual PxU32 | getLoopJoints (PxJoint **userBuffer, PxU32 bufferSize, PxU32 startIndex=0) const =0 |
| | returns the set of loop constraints in the articulation More...
|
| |
| virtual PxU32 | getCoefficientMatrixSize () const =0 |
| | returns the required size of coeffient matrix in the articulation. The coefficient matrix is number of constraint(loop joints) by total dofs. Constraint Torque = transpose(K) * lambda(). Lambda is a vector of number of constraints More...
|
| |
| virtual void | teleportRootLink (const PxTransform &pose, bool autowake)=0 |
| | teleport root link to a new location More...
|
| |
| virtual PxSpatialVelocity | getLinkVelocity (const PxU32 linkId)=0 |
| | return the link velocity in world space with the associated low-level link index(getLinkIndex()). More...
|
| |
| virtual PxSpatialVelocity | getLinkAcceleration (const PxU32 linkId)=0 |
| | return the link acceleration in world space with the associated low-level link index(getLinkIndex()) More...
|
| |
| virtual PxScene * | getScene () const =0 |
| | Retrieves the scene which this articulation belongs to. More...
|
| |
| virtual void | setSolverIterationCounts (PxU32 minPositionIters, PxU32 minVelocityIters=1)=0 |
| | Sets the solver iteration counts for the articulation. More...
|
| |
| virtual void | getSolverIterationCounts (PxU32 &minPositionIters, PxU32 &minVelocityIters) const =0 |
| | Retrieves the solver iteration counts. More...
|
| |
| virtual bool | isSleeping () const =0 |
| | Returns true if this articulation is sleeping. More...
|
| |
| virtual void | setSleepThreshold (PxReal threshold)=0 |
| | Sets the mass-normalized energy threshold below which an articulation may go to sleep. More...
|
| |
| virtual PxReal | getSleepThreshold () const =0 |
| | Returns the mass-normalized energy below which an articulation may go to sleep. More...
|
| |
| virtual void | setStabilizationThreshold (PxReal threshold)=0 |
| | Sets the mass-normalized kinetic energy threshold below which an articulation may participate in stabilization. More...
|
| |
| virtual PxReal | getStabilizationThreshold () const =0 |
| | Returns the mass-normalized kinetic energy below which an articulation may participate in stabilization. More...
|
| |
| virtual void | setWakeCounter (PxReal wakeCounterValue)=0 |
| | Sets the wake counter for the articulation. More...
|
| |
| virtual PxReal | getWakeCounter () const =0 |
| | Returns the wake counter of the articulation. More...
|
| |
| virtual void | wakeUp ()=0 |
| | Wakes up the articulation if it is sleeping. More...
|
| |
| virtual void | putToSleep ()=0 |
| | Forces the articulation to sleep. More...
|
| |
| virtual PxArticulationLink * | createLink (PxArticulationLink *parent, const PxTransform &pose)=0 |
| | adds a link to the articulation with default attribute values. More...
|
| |
| virtual PxU32 | getNbLinks () const =0 |
| | returns the number of links in the articulation More...
|
| |
| virtual PxU32 | getLinks (PxArticulationLink **userBuffer, PxU32 bufferSize, PxU32 startIndex=0) const =0 |
| | returns the set of links in the articulation More...
|
| |
| virtual void | setName (const char *name)=0 |
| | Sets a name string for the object that can be retrieved with getName(). More...
|
| |
| virtual const char * | getName () const =0 |
| | Retrieves the name string set with setName(). More...
|
| |
| virtual PxBounds3 | getWorldBounds (float inflation=1.01f) const =0 |
| | Retrieves the axis aligned bounding box enclosing the articulation. More...
|
| |
| virtual PxAggregate * | getAggregate () const =0 |
| | Retrieves the aggregate the articulation might be a part of. More...
|
| |
| virtual PxArticulationImpl * | getImpl ()=0 |
| |
| virtual const PxArticulationImpl * | getImpl () const =0 |
| |
| virtual | ~PxArticulationBase () |
| |
| virtual PxArticulationJointBase * | createArticulationJoint (PxArticulationLink &parent, const PxTransform &parentFrame, PxArticulationLink &child, const PxTransform &childFrame)=0 |
| |
| virtual void | releaseArticulationJoint (PxArticulationJointBase *joint)=0 |
| |
| virtual const char * | getConcreteTypeName () const =0 |
| | Returns string name of dynamic type. More...
|
| |
| template<class T > |
| T * | is () |
| |
| template<class T > |
| const T * | is () const |
| |
| PX_FORCE_INLINE PxType | getConcreteType () const |
| | Returns concrete type of object. More...
|
| |
| PX_FORCE_INLINE void | setBaseFlag (PxBaseFlag::Enum flag, bool value) |
| | Set PxBaseFlag. More...
|
| |
| PX_FORCE_INLINE void | setBaseFlags (PxBaseFlags inFlags) |
| | Set PxBaseFlags. More...
|
| |
| PX_FORCE_INLINE PxBaseFlags | getBaseFlags () const |
| | Returns PxBaseFlags. More...
|
| |
| virtual bool | isReleasable () const |
| | Whether the object is subordinate. More...
|
| |
a tree structure of bodies connected by joints that is treated as a unit by the dynamics solver
Articulations are more expensive to simulate than the equivalent collection of PxRigidDynamic and PxJoint structures, but because the dynamics solver treats each articulation as a single object, they are much less prone to separation and have better support for actuation. An articulation may have at most 64 links.
- See also
- PxArticulationJoint PxArticulationLink PxPhysics.createArticulation


--- layout: newsstory title: VERY POOR match: Yeltz 0 Margate 3 ---
I can't remember if I've ever felt so downbeat about our prospects for the rest of the season. For as long as I've supported the Yeltz (over 17 years now) we've always had a pretty good side with the potential to win things. I have no confidence at all that the next 7 months aren't going to be one long relegation battle .
I hoped that last week's FA Cup debacle would be the turning point, but unfortunately it's got worse . A spineless 3-0 defeat at home to Margate . After the win at Atherstone and creditable draw with Boston, we've slipped back again to our early season form. Come on.
On a (slightly) brighter note, Catalogue Man Paul Harding has finally signed for Dulwich Hamlet after being on loan there for a while. Good riddance. Also, I believe we've got a match next weekend against Dorchester , rearranaged to take advantage of our free FA Cup weekend.


--- layout: post title: What is new in iPhone5 permalink: what-is-new-in-iphone5/ date: 2012-11-25 12:11:31.000000000 +08:00 categories: - apple - gadgets tags: - iphone 5 features - iphone 5 review status: publish type: post published: true meta: review_rating: '' _edit_last: '2' _wpas_done_all: '1' _thumbnail_id: '616' _wpas_skip_1611607: '1' _wpas_skip_2203490: '1' author: Darwin Biler uri: https://plus.google.com/117859824066667225419/ _wpas_skip_2452381: '1' _wpas_skip_2452385: '1' _wpas_skip_2452386: '1' dsq_thread_id: '3023894060' cleaned: true ---
A faster processor means more powerful phone. The A6 processor compared to A5(used by iPhone 4S) and A4 (used by iPhone 4) is a lot faster with the blazing speed of 1.3 GHz with a dual-core CPU. The previous one which is A5 is only about 800 Mhz (iPhone4s) to 1 Ghz (iPad 2) which is a big difference. The SDRAM is is also a lot faster since iPhone 5 has
1GB of LPDDR2 SDRAM compared to iPhone4s which had only 512MB of LPDDR2 SDRAM.
4G LTE means a faster network connection, with this technology, mobile users will gonna have faster Internet access. Although it means that your carrier should also provide a 4G signal in able for you to utilize this technology. So there is no real use, if your country doesn't have 4G available yet.
iPhone 5 has 4-inch (diagonal) Retina display with a resolution of 1136x640. While the iPhone 4 and iPhone4s has only 3.5-inch (diagonal) Retina display with a 960-by-640 resolution. That means the display of iPhone 5 is sharper and can display more information without pixelating.
Photo Credit: http://www.cnet.com
Yes, you have to change your phone number if you want to use an iPhone 5. Existing SIM card is not compatible with iPhone 5. It is using a "nano-SIM", while the iPhone 4, iPhone 4s and iPad is using "micro-sim". Nano-SIM is a lot smaller than micro-sim. The regular SIM size that we used to know can be cut to have a micro-sim, but unfortunately, regular sim card cannot be cut for you to convert it to a nano-sim. So you have to buy a new sim card if you will use an iPhone 5.
Photo Credit: http://www.cnet.com
On iPhone 4 and 4s, the front camera is just VGA camera. iPhone 5 now uses 1.2 Megapixel camera on the front, featuring a 720p (HD) video recording capability.
Photo Credit: http://www.cnet.com
The connector was trimmed down from 30-pin to 8-pin connector, called "Lightning". There is no real improvement in speed but just a mere reduction of space occupied by the connector itself. That would mean, you cannot reuse the charger/ connector you have for previous iPod Touch/ iPhone 4 (although there is an adapter that you can buy).
Photo Credit: http://www.cnet.com
There is a new design for the earpods. With better bass quality and clean pleasant sound. It first also better in your ear. There is a built-in microphone and controls for your music player.
Photo Credit: http://www.cnet.com
iPhone 3GS and lower has a shiny metal plate on its back, then on iPhone 4 and iPhone 4S, they have a glass back which makes it seems very fragile. On iPhone 5, the aluminum metal was brought back but not with a shiny one, but with an anodized aluminum, although the top and bottom part remains a glass.
Photo Credit: http://www.cnet.com


'Egos Would Get The Better Of Ireland' – Gatland On Ireland's World Cup
by Sean McMahonWarren Gatland believes that Ireland’s ego was one of the contributing factors to their downfall in 2019 which ultimately culminated in another quarter-final exit at the World Cup.
The former Wales head coach was speaking to Off The Ball during the promotion of his new autobiography, ‘Pride and Passion’.
On Ireland’s disappointing World Cup, Gatland first offered the opinion that some players were on the pitch based on reputation rather than form.
“I’m not on the inside, I’m looking from the outside at it,” Gatland said.
“The only question I would ask is had two or three of those players who have been brilliant over the years just gone a little bit past it? That’s the only thing I’m saying. Was there one or two younger players who if they had been given the opportunity could have been stars?”
Gatland continued:
“I think over the last two or three years they became more predictable. They found a formula that was successful for them and they stuck to it, went away from it and they kept coming back to it. It was hard to play against, it was hard to stop. They played very direct. A lot of stuff off nine.
“When we played Ireland, the biggest thing we spoke about was keeping discipline. Trying not to give away penalties because they’d kick to the corner and then their ability to keep the ball in your 22 for phase after phase, it’s difficult to get off them. If you concede a penalty it’s either three points or kick for the corner again and then you’re conceding seven points. That’s hard to stop.”
A really interesting insight is how Gatland and other Six Nations coaches used the media as an attempt to goad Ireland out of playing to their strengths.
And it worked.
“Sometimes what happened and it wasn’t whether it was me or Eddie Jones, you could talk Ireland out of playing that way. Egos would get the better of Ireland and they would go and try to play a different way and be more expansive. They sometimes did [change tactics after comments in the media] and to their detriment.”
“If you look at England, John Mitchell came out and said before the first game of the Six Nations, ‘we can’t let Ireland bore us to death’.”


## Overview
* Hand presence technology for use with Oculus Rift.
* Launched on December 6, 2016 for $199 with sensor.
* On July 14, 2017 Oculus began to include Touch with the $400 Rift bundle.
* Ment to directly compete with VIVE Controller.
## How does it work?
The Touch Controllers are fitted with a series infrared LEDs. IR cameras are used to capture these LEDs and determine the position of the controllers.
![LEDs](images/controllerleds.gif)
Sensor Setup Screen
## Gestures
Thanks to the buttons on the Touch Controllers being capacitive advanced gesture controll is possible.
![Gestures](images/gesture.gif)
## Uses
Thanks to the prevalence of the Oculus Rift Platform and powerful Oculus OVRInput API, Touch brings meaningful interaction to a huge number of applications including:
* NVIDIA HOLODECK
* Engage Education Platform
* Soundstage VR
* Calcflow
* Applications made with A-frame
Why is it a good use of VR?
It's Intuative and Imersive Expression
It also makes interations in social VR more natural!
## Weaknesses
* Requires 3 cameras for 360 tracking.
* Bottom three fingers move together.
* Only tracks hands.
* Still too expensive to be completely mainstream.
Sickness/Nausea
I have been using the Oculus Touch Controllers for about 6 months and they have not added any discomfort to my VR expierence.
Rating: 0/10
## Similar Devices
* HTC VIVE Controllers
* PSVR Move Controllers
* Windows Mixed Reality Controllers
* And Valve's response... The Knuckles Controller
![knuckles](images/knuckles.gif)
## Conclusion
Oculus Touch is the current standard for VR hand presence technology. The advances it has made will only continue to be built upon to further our interactions with the virtual world.
## References
* https://www.oculus.com/blog/oculus-touch-launches-today/
* https://www.vrfocus.com/2015/06/palmer-luckey-explains-oculus-rifts-constellation-tracking-and-fabric/
* https://developer.oculus.com/documentation/unity/latest/concepts/unity-ovrinput/
* https://trentm95.github.io/CS4331-VR/Student'sChoice/
## Questions?


Here are two examples that make use of much of what you have learned in the last couple of chapters.
Paul Ehrenfest proposed a number of models for the diffusion of gas particles, one of which we will study here.
The model says that there are two containers containing a total of $N$ particles. At each instant, a container is selected at random and a particle is selected at random independently of the container. Then the selected particle is placed in the selected container; if it was already in that container, it stays there.
Let $X_n$ be the number of particles in Container 1 at time $n$. Then $X_0, X_1, \ldots$ is a Markov chain with transition probabilities given by:
\begin{equation} P(i, j) = \begin{cases} \frac{N-i}{2N} & \text{if } j = i+1 \\ \frac{1}{2} & \text{if } j = i \\ \frac{i}{2N} & \text{if } j = i-1 \\ 0 & \text{otherwise} \end{cases} \end{equation}The chain is clearly irreducible. It is aperiodic because $P(i, i) > 0$.
Question. What is the stationary distribution of the chain?
Answer. We have computers. So let's first find the stationary distribution for $N=100$ particles, and then see if we can identify it for general $N$.
N = 100
s = np.arange(N+1)
def trans_probs(i, j):
if j == i:
return 1/2
if j == i+1:
return (N-i)/(2*N)
elif j == i-1:
return i/(2*N)
else:
return 0
tbl = Table().states(s).transition_function(trans_probs)
ehrenfest = tbl.toMarkovChain()
Plot(ehrenfest.steady_state(), edges=True)
That looks suspiciously like the binomial (100, 1/2) distribution. In fact it is the binomial (100, 1/2) distribution. Since you've guessed it, all you have to do is plug it into the balance equations and check that they work out.
The balance equations are:
\begin{align*} \pi(0) &= \frac{1}{2}\pi(0) + \frac{1}{2N}\pi(1) \\ \pi(j) &= \frac{N-(j-1)}{2N}\pi(j-1) + \frac{1}{2}\pi(j) + \frac{j+1}{2N}\pi(j+1), ~~~ 1 \le j \le N-1 \\ \pi(N) &= \frac{1}{2N}\pi(N-1) + \frac{1}{2}\pi(N) \end{align*}You have already guessed the solution by looking at the answer calculated for $N=100$. But if you want to start from scratch, you'll have to simplify the balance equations and try to write all the elements of $\pi$ in terms of $\pi(0)$. You will get:
\begin{align*} \pi(1) &= N\pi(0) \\ \\ \pi(2) &= \frac{N(N-1)}{2} \pi0 = \binom{N}{2} \pi(0) \end{align*}and so on by induction:
$$ \pi(j) = \binom{N}{j} \pi(0) $$In other words, the stationary distribution is proportional to the binomial coefficients. So $\pi(0) = 1/2^n$ to make all the elements sum to 1, and the distribution is binomial $(N, 1/2)$.
Suppose I run the lazy reflecting random walk from the previous section for a long time. As a reminder, here is its stationary distribution.
stationary = refl_walk.steady_state()
stationary
Question 1. Suppose that every time the chain is in state 4, I win $\$4$; every time it's in state 5, I win $\$5$; otherwise I win nothing.
Answer 1. In the long run, the chain is in steady state. So I expect that on 62.5% of the moves I will win nothing; on 25% of the moves I will win $\$4$; and on 12.5% of the moves I will win $\$5$. My expected long run average reward per move is $\$1.625$.
0*0.625 + 4*0.25 + 5*.125
Question 2. Suppose that every time the chain is in state $i$, I toss $i$ coins and record the number of heads. In the long run, how many heads do I expect to get on average per move?
Answer 2. Each time the chain is in state $i$, I expect to get $i/2$ heads. When the chain is in steady state, the expected number of coins I toss at any given move is 3. So, by iterated expectations, the long run average number of heads I expect to get is 1.5.
stationary.expected_value()/2
If that seems artificial, consider this: Suppose I play the game above, and on every move I tell you the number of heads that I get but I don't tell you which state the chain is in. I hide the underlying Markov Chain. If you try to recreate the sequence of steps that the Markov Chain took, you are working with a Hidden Markov Model. These are much used in pattern recognition, bioinformatics, and other fields.


Our data comes from scores and rankings taken from the annual Gallup World Survey. The overall Happiness Score is calculated as a combination the following values: GDP Per Capita, Healthy Life Expectancy, Social Support, Freedom to Make Life Choices, Generosity, and Perception of Governmental Corruption. These variables are used to reflect what has been broadly found in the research literature to be important in explaining national-level differences in life evaluations.
Overall Happiness: Measured as the culmination of sentiment of several values, all of which play a part in the notion of Happiness.
GDP: Gross Domestic Product, the total value of goods produced and services provided in a country during one year.
Social Support: The provision of assistance of comfort to others, typically to help them cope with biological, psychological, and social stressors.
Life Expectancy: The average period that a person may expect to live.
Freedom: The power or right to act, speak, or think as one wants without hinderance or restraint.
Generosity: The quality of being kind and generous to citizens.
Corruption: The level of dishonesty or fraudulent conduct by those in power.
By clicking the Find Your Home tab, you will be given the opportunity to choose the values important to you, your business, and your family.


The internet says LGPL does not prevent commercial use in any way, see e.g. answers.google.com/answers/threadview/id/439136.html Only a few open-source licenses limit by use case, and none of them are considered "free" by organisations like FSF. If you want to use a free license, the kind of split you want to achieve is usually done by having a strong free copyleft license, which does not prevent commercial use, but is off-putting to commercial users. Then your alternative could be worth purchasing for them, to avoid need to open-source their own code


|
What
is it going to be like working in the Microsoft .NET environment?
Some
people will be shocked at the extent of the change. This isn't just
an upgrade between versions of the same product... Visual Studio.NET
is a new platform, it is not a language.
An
open platform is in - People will find that the .Net framework
environment opens up some of the complexities hidden in Visual Basic
6, resulting in greater challenges but with new benefits.
Stricter rules are in - Visual Studio.NET is more serious, and
difficult
to compile than the Visual Basic 6 due to a tightening of some programming
rules such as variable usage. Gone is the traditional variant declaration.
New web services are in - The .Net architectures most welcome
and significant Internet development incorporates new web services
that finally puts the flawed DCOM model to rest.
(Excerpts
from pages 20-22 of "Systems Developer" June 2001)
Special Offer: The full 4 page article can be found in your FREE
copy of the Systems Developer magazine. Systems
Developer is a new monthly IT magazine written for Australia's software
developers, published by Informa Publishing. You can receive the
first edition free by filling out a form on the Systems Developer
website.
Cheers until next time,
Adam
Got
a comment for Adam? Email Adam
|


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Please use the following links to upgrade your browser:
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Kiqstnd is a prototype bike parking locator for use in City of Philadelphia! The entire version of this app was developed in a little over 12 hours -- which means that it's very rough and not ready for primetime. It was made to demostrate the possiblity of making a bike parking locator that uses real data provided by the City. Not only does it allow a user to search for bike parking locations, it also shows them thefts that have happened nearby a specific location. The other feature is to give users the ability to add bike parking locations themselves (think crowd sourcing).
Search Instructions (and viewing theft data):
Add Parking Instructions:
Refresh the Bike Parking Data from the City
The app is the result of collaboration between Brian Kenny, Brad Steinberg, and Jeff Maher (with guidance from Dave Walk) at the #apps4philly Transit Hackathon in conjunction with Code for Philly (a Code for America Brigade). Future development is planned and we're happy to work with others, so let us know if you want to join in. Or don't, and just fork the project on GitHub (warning: the code is very ugly right now).
This app would not be possible without the awesome work of the City of Philadelphia that provided open bike data sets. The original data sets we use can be found here:
Lastly, the app makes use of the PHL Bike Theft REST API, a project created by the same group during the same weekend. It can be found here.


Decorate interface for parallel computation#
- class sage.parallel.decorate.Fork(timeout=0, verbose=False)#
Bases:
object
A
fork
decorator class.
- class sage.parallel.decorate.Parallel(p_iter='fork', ncpus=None, **kwds)#
Bases:
object
Create a
parallel
-decorated function. This is the object created byparallel()
.
- class sage.parallel.decorate.ParallelFunction(parallel, func)#
Bases:
object
Class which parallelizes a function or class method. This is typically accessed indirectly through
Parallel.__call__()
.
- sage.parallel.decorate.fork(f=None, timeout=0, verbose=False)#
Decorate a function so that when called it runs in a forked subprocess.
This means that it will not have any in-memory side effects on the parent Sage process. The pexpect interfaces are all reset.
INPUT:
f
– a functiontimeout
– (default: 0) if positive, kill the subprocess after this many seconds (wall time)verbose
– (default:False
) whether to print anything about what the decorator does (e.g., killing the subprocess)
Warning
The forked subprocess will not have access to data created in pexpect interfaces. This behavior with respect to pexpect interfaces is very important to keep in mind when setting up certain computations. It’s the one big limitation of this decorator.
EXAMPLES:
We create a function and run it with the
fork
decorator. Note that it does not have a side effect. Despite trying to change the global variablea
below ing
, the variablea
does not get changed:sage: a = 5 sage: @fork ....: def g(n, m): ....: global a ....: a = 10 ....: return factorial(n).ndigits() + m sage: g(5, m=5) 8 sage: a 5
We use
fork
to make sure that the function terminates after 100 ms, no matter what:sage: @fork(timeout=0.1, verbose=True) ....: def g(n, m): return factorial(n).ndigits() + m sage: g(5, m=5) 8 sage: g(10^7, m=5) Killing subprocess ... with input ((10000000,), {'m': 5}) which took too long 'NO DATA (timed out)'
We illustrate that the state of the pexpect interface is not altered by forked functions (they get their own new pexpect interfaces!):
sage: gp.eval('a = 5') '5' sage: @fork() ....: def g(): ....: gp.eval('a = 10') ....: return gp.eval('a') sage: g() '10' sage: gp.eval('a') '5'
We illustrate that the forked function has its own pexpect interface:
sage: gp.eval('a = 15') '15' sage: @fork() ....: def g(): return gp.eval('a') sage: g() 'a'
We illustrate that segfaulting subprocesses are no trouble at all:
sage: cython('def f(): print(<char*>0)') # optional - sage.misc.cython sage: @fork ....: def g(): ....: os.environ["CYSIGNALS_CRASH_NDEBUG"]="yes" # skip enhanced backtrace (it is slow) ....: f() sage: print("this works"); g() # optional - sage.misc.cython this works... ------------------------------------------------------------------------ Unhandled SIG... ------------------------------------------------------------------------ 'NO DATA'
- sage.parallel.decorate.normalize_input(a)#
Convert
a
to a pair(args, kwds)
using some rules:if already of that form, leave that way.
if
a
is a tuple make(a,{})
if
a
is a dict make(tuple(),a)
otherwise make
((a,),{})
INPUT:
a
– object
OUTPUT:
args
– tuplekwds
– dictionary
EXAMPLES:
sage: sage.parallel.decorate.normalize_input( (2, {3:4}) ) ((2, {3: 4}), {}) sage: sage.parallel.decorate.normalize_input( (2,3) ) ((2, 3), {}) sage: sage.parallel.decorate.normalize_input( {3:4} ) ((), {3: 4}) sage: sage.parallel.decorate.normalize_input( 5 ) ((5,), {})
- sage.parallel.decorate.parallel(p_iter='fork', ncpus=None, **kwds)#
This is a decorator that gives a function a parallel interface, allowing it to be called with a list of inputs, whose values will be computed in parallel.
Warning
The parallel subprocesses will not have access to data created in pexpect interfaces. This behavior with respect to pexpect interfaces is very important to keep in mind when setting up certain computations. It’s the one big limitation of this decorator.
INPUT:
p_iter
– parallel iterator function or string:'fork'
– (default) use a new forked subprocess for each input'multiprocessing'
– use multiprocessing library'reference'
– use a fake serial reference implementation
ncpus
– integer, maximal number of subprocesses to use at the same timetimeout
– number of seconds until each subprocess is killed (only supported by ‘fork’; zero means not at all)
Warning
If you use anything but
'fork'
above, then a whole new subprocess is spawned, so none of your local state (variables, certain functions, etc.) is available.EXAMPLES:
We create a simple decoration for a simple function. The number of cpus (or cores, or hardware threads) is automatically detected:
sage: @parallel ....: def f(n): return n*n sage: f(10) 100 sage: sorted(list(f([1,2,3]))) [(((1,), {}), 1), (((2,), {}), 4), (((3,), {}), 9)]
We use exactly two cpus:
sage: @parallel(2) ....: def f(n): return n*n
We create a decorator that uses three subprocesses, and times out individual processes after 10 seconds:
sage: @parallel(ncpus=3, timeout=10) ....: def fac(n): return factor(2^n-1) sage: for X, Y in sorted(list(fac([101,119,151,197,209]))): print((X,Y)) (((101,), {}),<PHONE_NUMBER>719 *<PHONE_NUMBER>03194129) (((119,), {}), 127 * 239 * 20231 * 131071 *<PHONE_NUMBER>7 *<PHONE_NUMBER>37) (((151,), {}), 18121 * 55871 * 165799 * 2332951 *<PHONE_NUMBER>388253664437433) (((197,), {}), 7487 *<PHONE_NUMBER>7912886929710867041891989490486893845712448833) (((209,), {}), 23 * 89 * 524287 *<PHONE_NUMBER>4681 *<PHONE_NUMBER>147247 *<PHONE_NUMBER>323960232319657) sage: @parallel('multiprocessing') ....: def f(N): return N^2 sage: v = list(f([1,2,4])); v.sort(); v [(((1,), {}), 1), (((2,), {}), 4), (((4,), {}), 16)] sage: @parallel('reference') ....: def f(N): return N^2 sage: v = list(f([1,2,4])); v.sort(); v [(((1,), {}), 1), (((2,), {}), 4), (((4,), {}), 16)]
For functions that take multiple arguments, enclose the arguments in tuples when calling the parallel function:
sage: @parallel ....: def f(a,b): return a*b sage: for X, Y in sorted(list(f([(2,3),(3,5),(5,7)]))): print((X, Y)) (((2, 3), {}), 6) (((3, 5), {}), 15) (((5, 7), {}), 35)
For functions that take a single tuple as an argument, enclose it in an additional tuple at call time, to distinguish it as the first argument, as opposed to a tuple of arguments:
sage: @parallel ....: def firstEntry(aTuple): return aTuple[0] sage: for X, Y in sorted(list(firstEntry([((1,2,3,4),),((5,6,7,8),)]))): print((X, Y)) ((((1, 2, 3, 4),), {}), 1) ((((5, 6, 7, 8),), {}), 5)
The parallel decorator also works with methods, classmethods, and staticmethods. Be sure to apply the parallel decorator after (“above”) either the
classmethod
orstaticmethod
decorators:sage: class Foo(): ....: @parallel(2) ....: def square(self, n): ....: return n*n ....: @parallel(2) ....: @classmethod ....: def square_classmethod(cls, n): ....: return n*n sage: a = Foo() sage: a.square(3) 9 sage: sorted(a.square([2,3])) [(((2,), {}), 4), (((3,), {}), 9)] sage: Foo.square_classmethod(3) 9 sage: sorted(Foo.square_classmethod([2,3])) [(((2,), {}), 4), (((3,), {}), 9)] sage: Foo.square_classmethod(3) 9
Warning
Currently, parallel methods do not work with the multiprocessing implementation.


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Register for the next Advanced Teen Astronomy Camp
The next Advanced Teen Astronomy Camp is scheduled for
June 19-26, 2019
The Advanced Teen Astronomy Camp is quantitative in its approach. Students are required to have completed satisfactorily either Algebra II or Geometry in school. Attendance at the Beginning Astronomy Camp is not necessary and does not automatically qualify a student for the Advanced Camp.
Students should be between the ages of 14 and 18 years. Some exceptions are made in special circumstances by Dr. McCarthy, the Camp Director.
Beginning in January 2019, qualified applicants will be accepted on a first-come, first-served basis until the Camp is full. Admission is limited to 25 students. To be successful applications must follow all the stated directions. Applications will be judged competitively based on the quality of their essays, ability to follow directions, and teacher recommendations. Prospective students must contact the Camp Director before applying.
Entrance into the Advanced Teen Camp is increasingly competitive. In 2018, the Camp was filled by mid-January and only 30% of all applications could be accommodated. We strongly urge students to adhere to the specific entrance requirements, to follow directions exactly, and to do the best job possible on the essay. Although we want former students to reapply, preference will be given to new students. Former Advanced Campers wishing to reapply must write about a research project which could be accomplished using Camp equipment and which could also involve other Campers. See the essay topics for more information.
June 19-26, 2019
The Advanced Teen Astronomy Camp is quantitative in its approach. Students are required to have completed satisfactorily either Algebra II or Geometry in school. Attendance at the Beginning Astronomy Camp is not necessary and does not automatically qualify a student for the Advanced Camp.
Students should be between the ages of 14 and 18 years. Some exceptions are made in special circumstances by Dr. McCarthy, the Camp Director.
Beginning in January 2019, qualified applicants will be accepted on a first-come, first-served basis until the Camp is full. Admission is limited to 25 students. To be successful applications must follow all the stated directions. Applications will be judged competitively based on the quality of their essays, ability to follow directions, and teacher recommendations. Prospective students must contact the Camp Director before applying.
Entrance into the Advanced Teen Camp is increasingly competitive. In 2018, the Camp was filled by mid-January and only 30% of all applications could be accommodated. We strongly urge students to adhere to the specific entrance requirements, to follow directions exactly, and to do the best job possible on the essay. Although we want former students to reapply, preference will be given to new students. Former Advanced Campers wishing to reapply must write about a research project which could be accomplished using Camp equipment and which could also involve other Campers. See the essay topics for more information.
Parents
Before Applying, you must consider your child's transportation to and from Astronomy Camp. We require that students arrive in
Tucson on the first day (June 19) of Camp before 3 pm Tucson time. On the last day (June 26), we will be driving two
hours from a remote mountain site to Tucson, so students cannot depart on airline flights any earlier than 2:00 pm
Tucson time. Limitations in airline schedules may make these arrangements difficult depending on your location. Although we can
accommodate a few students arriving one day early and/or departing one day late, such arrangements are inconvenient and will necessitate
additional cost to you.
Please email Dr. McCarthy, if you have travel concerns and questions.
Also, please note the following:
Please email Dr. McCarthy, if you have travel concerns and questions.
Also, please note the following:
- The tuition fee of $1250 includes all expenses during the Camp session such as room, board, materials, and local travel.
- Travel arrangements must be confirmed with Dr. McCarthy no later than April 15.
- Scholarship notification will made no later than March 4.
To Apply
In order to apply, first the student applicant must email Dr. McCarthy to confirm space is available and then mail the following six items in a single mailing to the address shown below. We will then send you follow-up information.
The remainder of the $1250 tuition fee must be received no later than April 15. Cancellation after this date will result in a forfeiture of 50% of the tuition fee.
Mail the above six items together to:
- Parents: Please read the above admonition about travel to/from Tucson.
- The completed application form
- A typewritten essay of at least 1200 words on one of three topics
- A confidential, sealed letter of recommendation from either a science or math teacher. In addition to describing the student's strengths, this letter should also address how the Astronomy Camp experience could benefit the student (e.g., socially, personally, academically, etc.)
- Your deposit in the amount of $250 (payable to Astronomy Camp) unless you are a scholarship applicant. [The full tuition is $1250; $50 is a non-refundable handling fee.]
- The signed disclaimer form
- Scholarship Application form (if necessary).
Mail the above six items together to:
Dr. Don McCarthy
Advanced Astronomy Camp for Teens
Steward Observatory
933 N. Cherry Ave.
Tucson, AZ 85721-0065
Advanced Astronomy Camp for Teens
Steward Observatory
933 N. Cherry Ave.
Tucson, AZ 85721-0065
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Site Design by Jacob Omann. Maintained by Astronomy Camp. Updated December 30, 2018
All Images, Media and Content - Copyright © 2019 Astronomy Camp
Site Design by Jacob Omann. Maintained by Astronomy Camp. Updated December 30, 2018


Maharashtra Government formation: Shiv Sena will have its CM at any cost, says Sanjay Raut
The BJP on November 10 announced that it would not form government in Maharashtra in view of the ally Shiv Sena's stand to not join them in the efforts
Reacting to the BJP's announcement that it would not form government in Maharashtra, senior Shiv Sena leader Sanjay Raut on November 10 said the party would install its chief minister at any cost.
"Maharashtra will have Sena's chief minister at any cost. Uddhav Thackeray on Sunday informed the party MLAs that Sena will have its chief minister," Raut told reporters.
The BJP on November 10 announced that it would not form government in Maharashtra in view of the ally Shiv Sena's stand to not join them in the efforts.
"How will BJP have its chief minister when they are not staking a claim to form government," Raut said.
The Shiv Sena has shifted most of its 56 MLAs to a hotel in suburban Malad, apparently to guard them against 'poaching' attempts. Sena chief Thackeray had held a meeting with his legislators at the hotel earlier in the day.Get access to India's fastest growing financial subscriptions service Moneycontrol Pro for as little as Rs 599 for first year. Use the code "GETPRO". Moneycontrol Pro offers you all the information you need for wealth creation including actionable investment ideas, independent research and insights & analysis For more information, check out the Moneycontrol website or mobile app.


The Stock Market Game
Warning : You can not save your game.
Disclosure : The stock data is from yahoo finance. Please see their fine print to see what the limitations are of this data. I can not guarantee accuracy of the data.
This is a simple game that is a project of mine. It is by no means a complete application. Enjoy.
×


Setting up Rails Apps with Passenger and Apache in Arch Linux, Ruby, Rails, Apache
Difficulty: 2
Time: 30 minutes
This article guides you on how to deploy Rails Apps with Passenger and Apache™ in Arch Linux. You will need at least one GB of RAM in a virtual server to run the Passenger commands, which consumes a lot of memory. It is assumed that the user has sudo
privileges to access the virtual server.
This guide includes development library installation and ad hoc compilation on the machine, hence it is not recommended to use this tutorial in a production environment.
To setup your Arch Linux server, refer to the article: initial Server Setup - Arch Linux. You need to ensure that the fully qualified domain name (FQDN) points to the server. After you have setup the Arch Linux server, you will need to install Ruby on Rails using RVM - Arch Linux. You may also refer to deploy Rails Apps with Passenger and NGINX - Arch Linux link.
LoadModule passenger_module /home/Logged_in_User/.rvm/gems/Installed_ruby_Version/gems/passenger-5.0.15/buildout/apache2/mod_passenger.so <IfModule mod_passenger.c> PassengerRoot /home/Logged_in_User/.rvm/gems/Installed_ruby_Version/gems/passenger-5.0.15 PassengerDefaultRuby /home/Logged_in_User/.rvm/gems/Installed_ruby_Version/wrappers/ruby </IfModule>
ServerName www.example.com:80 Include conf/extra/httpd-vhosts.conf
<VirtualHost *:80> ServerName www.mydomain.com //your server name DocumentRoot /var/www/html/HelloWorld/public //your rail application path <Directory /var/www/html/HelloWorld/public> AllowOverride all Options -MultiViews </Directory> </VirtualHost>
In this article, we reviewed the steps involved in setting up your Rails application with Passenger and Apache to make it more secure and reliable in a Arch Linux distribution.