Hello. I received a emonTx 3.4.1 a few weeks ago programmed to node id 8. I'm trying to modify the sketch (emonTx V3.4 Discrete Sampling V2.30 RFM69CW) to ignore the switch and use node id 9. The serial monitor seems to show that the emonTx is happy with this, but the emonBase isn't seeing this emonTx then. I can modify the sketch to specify node id 8 and the emonBase sees this emonTx without problems again. Restarting the emonBase hasn't helped.
What might be causing me to be unable to switch the node id of the emonTx?
I think I saw somewhere an explanation why recently shipped emonTx's use nodes 7/8 yet they used to ship as nodes 9/10 and the documentation speaks of only nodes 9/10. I've not been able to find that information tonight though. Could someone point out the explanation?
Thanks.
Re: Changing TX NodeID in software
If you take out the lines that change the NodeID based on the switch selection, then the nodeID will be and remain as it was initialised when the variable was created. If you want to be really sure, change the definition to be "const", which will cause an error if the code subsequently tries to change it.
Then in emonHub, you edit the config file to create a section that responds to the new nodeID. If there isn't a section that defines how the data from a node will be handled, that node is ignored.
Re: Changing TX NodeID in software
Thanks. In my case the problem was my emonhub.conf file for node 9 listed old firmware string and old datacode string. Apparently emonhub will ignore the incoming transmission if ?one or both? of these are not set right. ( It wasn't even listing the ?ignored? node 9 transmission in the debug mode emonhub log.)
Re: Changing TX NodeID in software
Yes, emonHub will ignore ANY inconsistency in the data. Unless you use the form that is common for each field (i.e. datacode = in the singular) then the count for each must exactly match the number of data items sent.
I wrote this formal definition a few days ago, it's yet to be verified/approved by Paul (pb66), so don't rely on it being totally accurate:
[[10]]
A numeric NodeID. This identifies the node to emonHub, and every node within your system must have a unique ID. There may be only one definition for each NodeId. The NodeID is programmed into the node firmware, either in the sketch and/or by switches.
nodename =
A text string, for your benefit in identifying each node.
firmware =
A text string specifying the sketch running on the node. (At present, this is for information only. At some future time, it might be used to auto-configure emonHub and/or the sketch.)
hardware =
Indicates the host environment.
[[[rx]]]
Must be "rx"
"rx" - emonHub receives the data from this node.
names =
A comma-separated list of names identifying the meaning of the data values. There must be exactly one name for each item of data, and except where the short form is used, each name on the list must have a corresponding datacode, scale and unit specified.
datacodes =
A comma-separated list of code letters from the table. Each code letter must exactly match the corresponding data item sent by the node both in type and in its position within the list.
short form: If all data items are of the same type, "datacodes = [a list]" can be replaced by (for example) "datacode = h"
default: if nothing is specified, "datacode = h" is used. "datacodes = [a list]" will override "datacode = [one code]"
scales =
A comma-separated list of multipliers. The value received from the node is multiplied by this coefficient and passed forwards to emoncms for logging and display. e.g, a voltage received as the integer 23153 with a multiplier 0.01 is passed forwards as the floating point value 231.53 A value of 1 should be used when no scaling is to be applied.
short form: If all data items require the same multiplier, "scales = [a list]" can be replaced by (for example) "scale = 1"
units =
A comma-separated list of engineering units to describe the data. Common units are W, kW, V, A, C, %.
Re: Changing TX NodeID in software
"If there isn't a section that defines how the data from a node will be handled, that node is ignored."
Actually it is the nodes module that ignores the data if there is no entry in emonhub.conf, emonhub will still process data without an entry in the [nodes] section of emonhub.conf, it will then publish and/or send that data to emoncms(s) but the nodes module will only process nodes that have an entry in emonhub.conf.
emonhub will not be able to pass data IF it has been specifically defined and the data received doesn't fit, the legacy method of processing all data using default values can be overridden by specifying the exact definition of the node, but if that is then not adhered to it will discard the packet as being "wrong" by the definition given.
"In my case the problem was my emonhub.conf file for node 9 listed old firmware string and old datacode string. Apparently emonhub will ignore the incoming transmission if ?one or both? of these are not set right. ( It wasn't even listing the ?ignored? node 9 transmission in the debug mode emonhub log.)"
The firmware version is not used or even read by emonhub as yet (future feature) it is only read and displayed by the nodes module and it has no verification process. The datacode string will cause a packet to be discarded but it will provide details of that in the log, the scales should also provide a log entry if the packet gets discarded.The names and units are not used in emonhub and have no error checks.
"emonHub will ignore ANY inconsistency in the data"
This is the appearance and may even be true in some instances for the "emonpi" variant of emonhub, I haven't tried every scenario but, emonHub is (was?) designed NOT to impose any mandatory configuration requirements whilst providing the facility to do so if the user wishes or if the application demands. emonhub should also provide in-depth logging of all steps, under no circumstance should emonhub just "ignore" data and this is true in most instances as we know emonhub.logs are probably the most valuable asset we have when debugging an emonBase and traffic from connected nodes.
Robert - Most of those definitions seem like a pretty accurate current status. The important parts are the [[node]] which must be a unique section heading in the conf and currently, yes it is closely tied with the 1-31 node ids of the rfm2pi, but the node ids can relate to any interfacer and therefore could be any number since the 32 node limit has been changed in emoncms to be a count not a max node id. In fact the nodes in emoncms no longer even need to be numbers they can be names, emonhub does currently have some filtering to accommodate the 1-31 rule but that can be removed when some node id to node name mapping is introduced.
And datacode(s), there is a basic check within emonhub to check the total data size if "datacodes" is provided so if a node of 2 longs is defined and a node of int,long,int is passed emonhub cannot tell the difference it is still 8 bytes, but the output will be very different to what is expected. So the important fact here is that the datacode array exactly matches the sketches typedef struct (payload).
If there are no datacode(s) defined then emonhub will use a default, this default can be set for the node in question by using datacode (no plural) in the nodes conf or if it is not defined there it will fall back to the interfacers default which is 'h' for the commonly used rfm2pi interfacer, but it is '0' for the serial and socket interfacers.
Scales are not yet implemented in v1.2, but in the "emonpi" variant scale(s) is pretty straight forward and applies the same scale vs scales logic but the validation is done on the number of scales equaling the number of decoded values rather than total (data)size.
The rest is pretty much (currently) eye candy for the nodes module and have no checks in emonhub, for the data to be displayed correctly in the nodes module though you would need to ensure each values datacode, scale, name and unit all align.
The [[[rx]]] is only used in the "emonpi" version, the original version has the datacodes in the [[node]] section. and to me the [[[tx]]] and [[[rx]]] do actually seem the wrong way round, since we are defining "the node" and the nodes "tx" payload definition is labeled "rx", ie from emonhub's position not the nodes position. This may well be changed in v2 as part of a larger overhaul as the whole [nodes] section is under re-evaluation.
Paul.
Re: Changing TX NodeID in software
Robert, I like that you describe how a field is used. Perhaps you could also indicate how the units field is or might eventually be used?
Anyway, it will be good to have a document like this.
Thanks!!


Preparation time
less than 30 mins
Cooking time
30 mins to 1 hour
Serves
Serves 2
Stir-fried chicken smothered in a sticky, sweet pineapple sauce with a kick of ginger and chilli. A dish to rival any takeaway, and it's really easy to make too!
Grate the ginger into a clean tea towel. Gather up the edges and squeeze the juice into a bowl. Discard the ginger fibres.
Put the sushi rice in a heavy-based deep saucepan, about 25cm/10in in diameter. Add the chicken stock, ginger juice, rice wine, five-spice and 300ml/10fl oz water and season with a pinch of sea salt and the white pepper. Bring to the boil, add the goji berries and cover with a tight-fitting lid. Reduce the heat to a light simmer and cook for 15–20 minutes, or until all the water has gone, the base is slightly golden and the rice is toasted – when lifted out, it should come out as one whole layer of rice.
Remove the pan from the heat and keep it half-covered. (This will keep the rice warm while allowing the steam to escape, keeping the bottom crispy.)
Meanwhile, to make the pineapple chicken, put the chicken in a bowl and season with salt and black pepper. Add the cornflour, mix well to coat and set aside.
Whisk together all the sauce ingredients in a small jug and set aside.
Heat a wok over a high heat until smoking. Add the rapeseed oil and chillies and fry for a few seconds. Add the chicken and stir-fry for 2–3 minutes. As it starts to turn opaque, add the rice wine and cook for 2–3 minutes, or until chicken is cooked through.
Add the pineapple and red pepper and cook for 30 seconds. Pour in the sauce, bring to the boil and simmer until the volume has reduced by half and the sauce is slightly sticky and thick. Add the spring onion and cashews (if using) and cook for 20 seconds, stirring well.
Transfer the chicken to a serving plate, garnish with the fresh coriander and serve immediately with the rice.


Who Are We?
Providence Restoration was founded on the unwavering commitment of providing the highest quality service, building long term relationships with our customers and investing in talented and motivated team members who embrace mutual respect and trust. We believe our word and handshake hold great value and customer satisfaction remains at the core of our business.
Providence Restoration delivers an unmatched level of commitment that is evident in everything that we do. We pride ourselves on being accountable, communicating exceedingly well, providing innovative solutions and the relentless pursuit of achieving superior results.
A spirit of Always Serving others is at the heart of our culture. Providence Restoration is on the front line of many devastating events that leave families and individuals in desperate circumstances. We believe in helping those in need by acts of kindness and charitable contributions. We encourage our team members to donate their time and get involved in church and community organizations that support the causes they’re passionate about, improving other people’s lives in ways both great and small. We’ve found that Always Serving others isn’t just rewarding, it’s contagious. Providence Restoration is Always Serving.


Each specified header will be decorated with a prepended numeration.
Headline 1
Headline 2
Headline 3
Headline 4
Headline 5
Headline 6
Here we test, a link and other formattings such as
bold, italic or
deleted text
. You may also use formattings for maths 2
2 = 4 or chemical formulas like CO2.
Or you may edit tables as you do in office products.


IAmAChannel Properties
The
IAmAChannel
type exposes the following members.
Properties
Name
Description
Length
Gets the length.
Name
Gets the name.
See Also
IAmAChannel Interface
paramore.brighter.commandprocessor Namespace


EVP_PKEY_fromdata_init, EVP_PKEY_fromdata, EVP_PKEY_fromdata_settable - functions to create keys and key parameters from user data
#include <openssl/evp.h>
int EVP_PKEY_fromdata_init(EVP_PKEY_CTX *ctx);
int EVP_PKEY_fromdata(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey, int selection,
OSSL_PARAM params[]);
const OSSL_PARAM *EVP_PKEY_fromdata_settable(EVP_PKEY_CTX *ctx, int selection);
The functions described here are used to create new keys from user provided key data, such as n, e and d for a minimal RSA keypair.
These functions use an EVP_PKEY_CTX context, which should primarily be created with EVP_PKEY_CTX_new_from_name(3) or EVP_PKEY_CTX_new_id(3).
The exact key data that the user can pass depends on the key type. These are passed as an OSSL_PARAM(3) array.
EVP_PKEY_fromdata_init() initializes a public key algorithm context for creating a key or key parameters from user data.
EVP_PKEY_fromdata() creates the structure to store a key or key parameters, given data from params, selection and a context that's been initialized with EVP_PKEY_fromdata_init(). The result is written to *ppkey. selection is described in "Selections". The parameters that can be used for various types of key are as described by the diverse "Common parameters" sections of the EVP_PKEY-RSA(7), EVP_PKEY-DSA(7), EVP_PKEY-DH(7), EVP_PKEY-EC(7), EVP_PKEY-ED448(7), EVP_PKEY-X25519(7), EVP_PKEY-X448(7), and EVP_PKEY-ED25519(7) pages.
EVP_PKEY_fromdata_settable() gets a constant OSSL_PARAM(3) array that describes the settable parameters that can be used with EVP_PKEY_fromdata(). selection is described in "Selections".
Parameters in the params array that are not among the settable parameters for the given selection are ignored.
The following constants can be used for selection:
Only key parameters will be selected.
Only public key components will be selected. This includes optional key parameters.
Any keypair components will be selected. This includes the private key, public key and key parameters.
These functions only work with key management methods coming from a provider. This is the mirror function to EVP_PKEY_todata(3).
EVP_PKEY_fromdata_init() and EVP_PKEY_fromdata() return 1 for success and 0 or a negative value for failure. In particular a return value of -2 indicates the operation is not supported by the public key algorithm.
These examples are very terse for the sake of staying on topic, which is the EVP_PKEY_fromdata() set of functions. In real applications, BIGNUMs would be handled and converted to byte arrays with BN_bn2nativepad(), but that's off topic here.
#include <openssl/evp.h>
/*
* These are extremely small to make this example simple. A real
* and secure application will not use such small numbers. A real
* and secure application is expected to use BIGNUMs, and to build
* this array dynamically.
*/
unsigned long rsa_n = 0xbc747fc5;
unsigned long rsa_e = 0x10001;
unsigned long rsa_d = 0x7b133399;
OSSL_PARAM params[] = {
OSSL_PARAM_ulong("n", &rsa_n),
OSSL_PARAM_ulong("e", &rsa_e),
OSSL_PARAM_ulong("d", &rsa_d),
OSSL_PARAM_END
};
int main()
{
EVP_PKEY_CTX *ctx = EVP_PKEY_CTX_new_from_name(NULL, "RSA", NULL);
EVP_PKEY *pkey = NULL;
if (ctx == NULL
|| EVP_PKEY_fromdata_init(ctx) <= 0
|| EVP_PKEY_fromdata(ctx, &pkey, EVP_PKEY_KEYPAIR, params) <= 0)
exit(1);
/* Do what you want with |pkey| */
}
#include <openssl/evp.h>
#include <openssl/param_build.h>
#include <openssl/ec.h>
/*
* Fixed data to represent the private and public key.
*/
const unsigned char priv_data[] = {
0xb9, 0x2f, 0x3c, 0xe6, 0x2f, 0xfb, 0x45, 0x68,
0x39, 0x96, 0xf0, 0x2a, 0xaf, 0x6c, 0xda, 0xf2,
0x89, 0x8a, 0x27, 0xbf, 0x39, 0x9b, 0x7e, 0x54,
0x21, 0xc2, 0xa1, 0xe5, 0x36, 0x12, 0x48, 0x5d
};
/* UNCOMPRESSED FORMAT */
const unsigned char pub_data[] = {
POINT_CONVERSION_UNCOMPRESSED,
0xcf, 0x20, 0xfb, 0x9a, 0x1d, 0x11, 0x6c, 0x5e,
0x9f, 0xec, 0x38, 0x87, 0x6c, 0x1d, 0x2f, 0x58,
0x47, 0xab, 0xa3, 0x9b, 0x79, 0x23, 0xe6, 0xeb,
0x94, 0x6f, 0x97, 0xdb, 0xa3, 0x7d, 0xbd, 0xe5,
0x26, 0xca, 0x07, 0x17, 0x8d, 0x26, 0x75, 0xff,
0xcb, 0x8e, 0xb6, 0x84, 0xd0, 0x24, 0x02, 0x25,
0x8f, 0xb9, 0x33, 0x6e, 0xcf, 0x12, 0x16, 0x2f,
0x5c, 0xcd, 0x86, 0x71, 0xa8, 0xbf, 0x1a, 0x47
};
int main()
{
EVP_PKEY_CTX *ctx;
EVP_PKEY *pkey = NULL;
BIGNUM *priv;
OSSL_PARAM_BLD *param_bld;
OSSL_PARAM *params = NULL;
int exitcode = 0;
priv = BN_bin2bn(priv_data, sizeof(priv_data), NULL);
param_bld = OSSL_PARAM_BLD_new();
if (priv != NULL && param_bld != NULL
&& OSSL_PARAM_BLD_push_utf8_string(param_bld, "group",
"prime256v1", 0)
&& OSSL_PARAM_BLD_push_BN(param_bld, "priv", priv)
&& OSSL_PARAM_BLD_push_octet_string(param_bld, "pub",
pub_data, sizeof(pub_data)))
params = OSSL_PARAM_BLD_to_param(param_bld);
ctx = EVP_PKEY_CTX_new_from_name(NULL, "EC", NULL);
if (ctx == NULL
|| params == NULL
|| EVP_PKEY_fromdata_init(ctx) <= 0
|| EVP_PKEY_fromdata(ctx, &pkey, EVP_PKEY_KEYPAIR, params) <= 0) {
exitcode = 1;
} else {
/* Do what you want with |pkey| */
}
EVP_PKEY_free(pkey);
EVP_PKEY_CTX_free(ctx);
OSSL_PARAM_free(params);
OSSL_PARAM_BLD_free(param_bld);
BN_free(priv);
exit(exitcode);
}
#include <openssl/evp.h>
#include <openssl/core.h>
/* Program expects a key type as first argument */
int main(int argc, char *argv[])
{
EVP_PKEY_CTX *ctx = EVP_PKEY_CTX_new_from_name(NULL, argv[1], NULL);
const OSSL_PARAM *settable_params = NULL;
if (ctx == NULL)
exit(1);
settable_params = EVP_PKEY_fromdata_settable(ctx, EVP_PKEY_KEYPAIR);
if (settable_params == NULL)
exit(1);
for (; settable_params->key != NULL; settable_params++) {
const char *datatype = NULL;
switch (settable_params->data_type) {
case OSSL_PARAM_INTEGER:
datatype = "integer";
break;
case OSSL_PARAM_UNSIGNED_INTEGER:
datatype = "unsigned integer";
break;
case OSSL_PARAM_UTF8_STRING:
datatype = "printable string (utf-8 encoding expected)";
break;
case OSSL_PARAM_UTF8_PTR:
datatype = "printable string pointer (utf-8 encoding expected)";
break;
case OSSL_PARAM_OCTET_STRING:
datatype = "octet string";
break;
case OSSL_PARAM_OCTET_PTR:
datatype = "octet string pointer";
break;
}
printf("%s : %s ", settable_params->key, datatype);
if (settable_params->data_size == 0)
printf("(unlimited size)\n");
else
printf("(maximum size %zu)\n", settable_params->data_size);
}
}
The descriptor OSSL_PARAM(3) returned by EVP_PKEY_fromdata_settable() may also be used programmatically, for example with OSSL_PARAM_allocate_from_text(3).
EVP_PKEY_CTX_new(3), provider(7), EVP_PKEY_gettable_params(3), OSSL_PARAM(3), EVP_PKEY_todata(3), EVP_PKEY-RSA(7), EVP_PKEY-DSA(7), EVP_PKEY-DH(7), EVP_PKEY-EC(7), EVP_PKEY-ED448(7), EVP_PKEY-X25519(7), EVP_PKEY-X448(7), EVP_PKEY-ED25519(7)
These functions were added in OpenSSL 3.0.
Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at https://www.openssl.org/source/license.html.


We care deeply about our environment and work hard to do what we can, not only to mitigate our impact but help preserve and nurture what we have. We do regular land and sea ‘clean ups’, have a coral nursery and help out with many other artificial reef projects. We have a dedicated conservation instructor on staff, and are also involved in reef monitoring and surveying for a number of bodies too. We actively promote recycling and the reduction of plastic consumption and waste.
There are countless dive trip operators and agents out there. As with any other industry, there are good and there are bad. We work with only the best scuba operators to ensure that you spend a hassle-free vacation DIVING.
We hope this answers many of questions you may have had about diving with us. However if you have any further questions or require more details on any of our dives or courses, please do contact us and we will be only too happy to assist you.
We carefully craft your individual journey or group trip, ensuring you experience the very best DIVING adventures below the waves.
If you’re an adventurer at heart with a passion for the environment, with Our marine conservation programs, You can have a great experience, get certified and save the ocean at the same time.
Interested in learning to scuba dive? You’ve come to the right place...Scuba lessons unlock the door to new adventures and amazing animal encounters. By the end of your scuba certification course, you’ll see our ocean planet through new eyes.
We own and operate specialized equipment used to perform a wide range of offshore platform structural repairs, inspection services, pipeline repairs and re-routes, grouting repairs, and specialized hyperbaric and wet welding....Our diving services also include non-asset work performed to meet various government and customer requirements.
we believe in managing our business in a way that promotes safety, health, the environment, and strong ethics, while supporting the communities in which we live and work. Our Core Values are at the heart of everything we do.
We are committed to responsible business practices within our organization and throughout our supply chain around the world. We strive to continually improve within the areas of human rights, labor standards and the environment and to work against any form of corruption.
pieces of plastic pollution find their way into our ocean daily
Tonnes float on the surface
Marine Mammals are killed by Ocean plastic every year
square kilometers is The Great Pacific Garbage Patch
You can learn to dive in just about all of our destinations! There are a couple of options as to how you breakup your course but learning to dive is easy, safer than ever and can be done by almost anyone.
We understand that many divers do not necessarily have all their own equipment or want to travel with heavy bags. We can pre book equipment for liveaboards. From larger tanks to full kit or rebreather tanks, remember to add any kit extras onto your booking before you travel. Resort based holidays will normally be able to provide rental kit locally at very reasonable costs but do check at the time of booking.
If you are looking for a special trip that you will always remember then look no further. The Maldives is a classic destination with white sands, awesome diving and both liveaboard and shorebased options. Seychelles is a romantic break away from the world or take a look at Redsea for a secluded resort getaway. Likewise, Panama ticks all the boxes. If you fancy a liveaboard, then why not spoil yourself with one of The 5 star boats and sail some of the most beautiful and remote locations around the World.
We always have cracking deals for anyone looking to make serious savings. Last minute travel specials are advertised on our special offer page and we mail out regular updates of the up and coming deals. Simply fill in our online form and we will make sure you don't miss a beat.


Browser: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.66 Safari/535.11
My BBLog Addon Version is: 1
when on inline youtube (i think thats what it's called) the videos overlap the bar at the bottom of the page where there's game manager and coms centre and covers it over. It's only a slight problem and it's a really good add on otherwise!
BrainFooLong
Administrator
Hi!
Isn't possible to fix, i cannot modify the youtube videos in the frame.
Greetz
BrainFooLong
Administrator
It's fixable. My mistake. In the next update its fixed.
Topicstarter
Guest
Another similar problem is that if a box comes up (eg. do you want to close the game?) it appears behind the videos so it's hard to see unless you scroll to the right place
BrainFooLong
Administrator
All overlapping videos are fixed in next update.
Greetz


Hijax is the progressive enhancement concept of intercepting link clicks via JavaScript.
The links (anchors) include normal href
values that work
just as well for browsers that have JavaScript disabled as they do for
search engine bots. When JavaScript is present (in a normal web browser) the
click action on the link is intercepted or "hijacked" and an Ajax request is
initiated rather than allow the standard full-browser request for the page.
The following code listing demonstrates how you can select all relative links in jQuery:
var selector = '#content-container a[href^="/"], ' + '#content-container a[href^="' + window.location.origin + '"]'; $(selector).on('click', function (e) { e.preventDefault(); var href = this.getAttribute('href'); // do some processing here return false; });
The Hijax approach is often used in conjunction with either the hash/hash-bang or history implementations to keep the URL updated during Ajax requests. Read more on the architectural overview.


"It is important to stay low sometimes"
You must have something to hold on to. But what matters is the perspective.


Behavior
Coffing's smile suggests that he is always happy and curious about everything and everywhere, even if he was hit by another Pokemon.


Medikal Gifts Mmebusem Bike After MTN 4Syte Music Video Awards-Photos
by BB JonesOne of the biggest performances recorded at the 2019 4Syte Music Video Awards which was held on November 16 at the Kempinski Hotel in Accra was that of Medikal.
The rapper appeared on stage with new internet sensation, Mmebusem aka local Jesus, sending the crowd into a state of frenzy.
Their well rehearsed stagecraft excited the audience and it made Medikal arguably the standout performer of the evening.
It seems Medikal was so impressed with what Mmebusem brought to the table so he decided to reward him handsomely after the show.
In a new photo, the local Jesus is seen posing with a beautiful bike which seems to be a gift from the VGMA Best Rapper of the Year.
See below:


{% extends 'base.html'%} {% import 'bootstrap/wtf.html' as wtf %} {% block content %}
{{ comment.comment }}
No comments currently


I picked up a cheap Grinding Wheel at the Store, but it lacked an Arbor. I tried using a bolt, but it would not run true because no bolt had the exact diameter. So I made this Arbor on the Lathe. The Thread is M12.


July 12, 2021
Neuroplasticity
-
How does understanding the principles of neuroplasticity benefit people?
When people learn how their brain works, they become more motivated and open to learning, knowing that everyone possesses the ability to learn.
Being actively aware of how you learn benefits the learning process.
It is also something that aids in the recovery after accidents, or to overcome disabilities.
How might I engage with the principles of neuroplasticity for my own benefit?
Doing these reflections is a very effective way of engaging with neuroplasticity. Reflecting on new material allows me to traverse the pathways I have just made and strengthen them, allowing me to digest the information more effectively.
What are some of the ways to increase my neuroplasticity?
Practice what I have learnt over the day.
Think about how I could apply the new information into something practical, or into a personal project going forward.
A link to a resource that I found particularly useful!
TEDx Vancouver, Dr. Lara BoydGrowth Mindset
-
What is it and why is it relevant?
It’s a way of thinking. To understand and accept that we may not know everything, but we all possess the ability to grow and learn new things to become better.
Everyone is unique in their way of learning. It is important to understand what is most effective for you.
It’s oozing with positive VIBES and motivation!
Did anything surprise or change for me?
Prior to knowing about the two mindsets, I think there are times where I would fall into the fixed category. I will make active efforts to change my way of thinking until it becomes natural.
I found it to be a positive and inspirational topic and fuel for motivation.
How will I integrate a growth mindset into my learning journey?
One aspect of Carol Deck’s Ted Talk that I found fascinating was her example of the power of the word “yet”. It leaves a pathway open to success. I know that there will be aspects to this course that I will struggle in, but I will choose to embrace the challenge and persevere through obstacles, knowing that I will get there in my own time.
Ted Talk with Carol DweckAnother link to a resource that you found particularly useful!
Neat little animation about developing a Growth MindsetBlend with your learning plan and strategies
Reflecting on how these understandings may shape or influence my learning plan and strategy.
Understanding Neuroplasticity and developing a Growth Mindset are important for motivation. Covering both of these topics was a positive and inspirational experience that got me pumped for learning!
When my code breaks (which is always!), I will remain positive! Or at the very least delay frustration because I know that I WILL understand why and fix it (eventually)!


Furry Boat Party
Estrel Berlin — 13 August 2019 — Departure 19:00 CEST
Estrel Berlin — 13 August 2019 — Departure 19:00 CEST
Hot Summer Nights is an exclusive party on a large boat. From the Estrel dock to the Spree and back, through the German Capital, take in the sunset and mingle on the upper deck, retreat to the lounge and dancefloor with live DJs.
The first edition of Hot Summer Nights will depart at 19:00 CEST, starting from the Estrel hotel. For 4 hours we will entertain you with music, events and a beautiful sightseeing over the Spree river in Berlin.
The location is one of the larger ships of the Stern und Kreis Company. All ships are equipped with a bar, outdoor area and plenty of space to chill, dance and suit.
On the boat we have a fully equipped bar with all kinds of drinks available. Want a drink after fursuiting or dancing? No problem! But keep in mind that the bar takes cash only and is operated by the ship company – You can't bring your own drinks.
Do boats and fursuits work? Of course they do! We make sure that it's very easy to bring your stuff on the boat, and we will have a fursuit lounge with basic supplies. Water for suiters is provided, but please don't bring your own drinks. We do understand that you maybe don't want to suit during the whole trip. Simply change out of suit and we keep guard.
For this party you don't have to travel at all! The boat will depart from the Estrel, at the beergarden pier. Also it will bring us all back there. Please mind that check-in (getting your badge and goodies) will be done before boarding and also close to the hotel. More info about that will be released later.
All profits we make will be donated to the charity of Eurofurence. These are profits from the normal tickets, but especially the VIP upgrade can help the charity a lot.
€25
+€15
€35
The VIP upgrade is our name for the good old sponsor upgrade. With this upgrade you not only get special goodies, but you also support us so that we can make it the best party ever! The upgrade is not limited to a maximum amount and can always be bought later in the user area. Downgrading is not possible but transferring it to someone else is. Just send us an email.
Before you register it is important that you are familiar with our Code of Conduct and Terms and Conditions. They explain the rules for keeping it a fun and awesome party.
Want to see who is going to party hard with us? Check out our Attendees List!
If you have any questions or can't wait until the party is starting, then join our Telegram group @summerboat.
We wanted to do something special for celebrating the 25th edition of Eurofurence and the 5th edition in Berlin, the cities that knows how to party! So why not on a boat? We can show you around Berlin via the beautiful Spree river and in the mean time chill, party and suit up. Basically we have a fursuitwalk (without walking) and party in one. Throw in a beautiful sunset and the best DJs and it's a perfect experience you don't want to miss.
Early Bird tickets cost €25. When there are no more available, you can purchase a Normal ticket for €35. There are only 100 early bird tickets available. We also offer a VIP upgrade for €15. You get a special gift and a super limited VIP badge, but you also help us to make the party even more awesome.
You need to be 18 years or older on the day of the party. We are serving alcohol on board and legalwise it's best to keep it 18+. We do not make exceptions for it. Period.
Yes! Simply login with your account details, go to 'Edit Details' and tick the box for VIP upgrade in the user area. Fill in your password below and click submit. You will receive an email as a confirmation. Payment of the VIP Upgrade will be required at our Check-in desk when you pick up your badge.
On Tuesday 13th August (afternoon) you can pick up your Summerboat badge at our Check-in counter (near the EF Reg desk).
In the evening you will find our Info & Check-in desk in the beergarden near the boat. Please make sure you
bring your ID or Passport with you. The badge is your entrance to the party so please do not lose it.
Keep in mind: Badge pickup and Check-in before Boarding!
All profits will go to charity! The more VIP upgrades we sell, the more we’ll be able to donate! Thank you for considering being generous! The total amount of raised funds will be announced and published by the end of Eurofurence 25.
There will be a dancefloor, lounge area and even a fursuit lounge. Of course you can also just chill outside with a drink and enjoy the sunset over Berlin.
We'll also be playing some games and events including fursuit limbo, dance-off, and more. Stay tuned for more events like a photoshoot and karaoke.
Expect all kinds of music for the perfect night of lounging and chilling. Think: "Beach Club in Berlin". To get you in the mood we are creating a Spotify playlist you can listen to. The playlist is just a small peek into the music styles our DJs play.  You can find the playlist here.
The chance of getting seasick on this boat is very minimal. This is because the speed and the size of the boat make it impossible to feel any waves from other boats on the Spree. We do advise to talk with your doctor in case you get seasick very easily. It will be smooth sailing!
We are an independent team of organisers, officially acknowledged and supported by Eurofurence. We want to offer Early Arrival attendees a party to kick off your convention experience! Ticket payment will be handled by the official Eurofurence Reg system starting on 25th March 2019; VIP upgrade you will directly pay to Eurofurence Charity.
Curious husky that loves to organize stuff. Originally from Netherlands, now lives in Berlin, Germany. Started with organizing the Furrave for many years, now expanding to Berlin and Germany. Loves gaming, fursuits and parties!
I'm literally a dragon, like, actually in real life. I do computer things in my free time and, obviously, code a lot. This draggo is making sure that everything technical works smoothly.
The one and only Berlin-living American Akita Dog. Originally from Melbourne but moved to Berlin. Always looking out for food and more food! Responsible for all the beautiful colors you can see here on the website and at the party.
Internet dog personality. I'm from the Netherlands but I deserted to Switzerland many moons ago. I know a lot of people and I shout a lot while trying to be as useful as I can. That you are reading this, means I did my job right.
Half dog half werewulf, living in Berlin and loves to organize things for (not only) furries. Active in Eurofurence staff as well. Very nice to talk to and can be critical in the good way.
A German black wolf from Stuttgart who can speak many languages if given cider. Wise and smart but loves to play tricks on people.
Want to be part of the ship crew? We are always looking for more people to improve the party. You will be part of an awesome team who loves to think out of the box. Everything is possible! Are you interested? Click the button below to contact us!
Volunteer


Joined a large organization
2021
Joined SquareTrade, owning the Data Platform, managing data pipeline integrations that support 50+ retail partners and merchant integrations (e.g Amazon, Apple). Core of the entire warranty claim lifecycle for 120m+ customers. Not my jam.


Posted on January 1, 2021 at 12:00 PM
I’m not one of those naturally high scorers. My PSAT score in 10th grade was a 1240.  I mainly struggled on the English section and breezed through the math section which is the easiest or most masterable section. For all those out there who struggle in English and breeze through the math, this is the resource page for you!! This article is primarily intended for students in the 1100-1400s range. If I was able to turn my score around, there is no reason why you can’t. This article will go through the topic about score ranges and the looming question of whether you should retake the SAT.
If you're looking to see which test is easier, there is no general answer. Both are equivalent in difficult for the average population, however there are key differences which may affect your performance.
A standardized test has a purpose of comparing you to students from across the nation, and thus if one was easier, its scores wouldn't be valued as much, so let's dig into which one you should take.
If you struggle in Reading, this section could be a game changer, so let's compare the reading sections.
| SAT | Qualities |
|---|---|
| More Time | With 52 questions in 65 minutes. Although this is because of question difficulty, you get more time to read the passsages. If you are slow at reading or skimming, this is one reason to consider SAT |
| More Complicated Passages | The SAT reading section is the hardest section on the whole test to master. The passages are more difficult to comphrend and the questions are also more inference-type rather than straight from the text. If you struggle with comphrension, it may be a reason to consider the ACT. However, it is masterable with enough effort. | Deeper and more subjective-like questions | The questions have similar answer choices, and students often struggle to pick the right one. This requires deeper practice, but the curve is more forgiving as a result compared to the ACT. If you make silly mistakes a lot, maybe prefer the SAT because you can miss 5-7 and still get a 350/400. |
| Science Passage Majority | 3 of the 5 passages are definitely either science or social science. If you're good at nonfiction passages, you may want to consider the SAT. Although the ACT also has a devoted section for scientific experiment comphrension: the sciecne section. See how you perform on the Reading + Science Section and compare them to your reading score and weight which works better. |
| Weightage | The SAT reading section is out of 400 points, which is 25% of the total 1600 possible points. If you're bad at Reading, I suggest the SAT because the ACT has another section called the science section, which is just reading comphrension for science. |
| ACT | Qualities | |
|---|---|---|
| Less Time | With 40 questions in just 35 minutes, this section requires extremely quick reading. Although the questions are more straightforward, teaching yourself to read faster is a tough skill. So I recommend that you give it a shot and see if you can read fast enough. The SAT is better in this department. | |
| Passages | The passages are of generally equivalent difficulty compared to the SAT. Although time is much less, so you have to comphrend much quicker. Again, if you're slow, give SAT a point. | Surface Level and Objective Questions | The questions are much more straightforward, but stil require good comphrension. If you usually take your time with questions and need to verify or properly eliminate and check the passage alot, you might want to go with the SAT; on the ACT you won't have much time to decide. |
| Preparation | The ACT reading is masterable, but when under extreme time pressure, it's sometimes difficult to apply what you have learned. The SAT reading is harder to master, but it's easier to apply what you learned due to the extra time. | |
| Weightage | There is one reading section and one science section which is heavy in reading comphrension. This totals to 50% of the test, therefore I would reccommend SAT if you're bad at Reading. |
| SAT | Qualities |
|---|---|
| More Time | With 44 questions in 35 minutes. Although this is because of question difficulty, you get more time to read the passsages and think about the questions. |
| More Complicated Questions | The SAT writing section is extremeley masterable, HOWEVER, there is a subset of questions that require native familiarity. This involves idioms or word choice, something that you develop over time with intuition. If you aren't a native speaker, this stop you from maxing your score. |
| Predictable Passage Themes | After doing 5-10 real practice test, you'll start seeing patterns, this is often what drives improvement to the point of missing ~3 questions |
| Weightage | Equal to ACT weightage. |
| ACT | Qualities |
|---|---|
| Less Time | A whopping 75 questions in just 45 minutes!!! The pacing is much quicker, and you are still expected to comphrend the passage and answer similar questions to the SAT. Timing wise, this section is brutal. Missing even a couple of questions will take your score down to 33. |
| Less Complicated Passages | The passages are more straightforward, but less predictable. You regardless have to comphrend them in higher time pressure. | Surface Level and Basic Grammar is More Prevalent | There are more grammar based questions but they are still imbedded with tricks to knock of points on your score. |
| Weightage | Same as SAT |
| SAT | Qualities |
|---|---|
| Weightage | On the SAT, math is weighted at 50%, more than the 25% on the ACT |
| Difficulty | Much easier than the ACT. Basic topics. |
| Word Problems | The problems aren't as straightforward, but they have more basic topics as mentioned before. More on the concept, less with the numbers/calculation |
| Preparation | Easier to prepare for since the topics are from lower level classes like Algebra I and Geometry |
| Timing | Total of 58 questions in 80 minutes. Less time pressure than the SAT, despite the easier questions. |
| ACT | Qualities |
|---|---|
| Weightage | On the SAT, math is weighted at 50%, more than the 25% on the ACT |
| Difficulty | Harder than the SAT. Tests Trigonometry and some Precalc topics |
| Word Problems | Problems are more straightforward, but harder concepts |
| Preparation | Harder to prepare for since the content tested is more vast. |
| Timing | 60 questions in 60 minutes. More time pressure than the SAT, despite the harder questions. |
In the end, you need to consider the differences above and take a diagnostic test. Naturally, you will score low in both tests before preparing. Don't just compare the scores though, you want to consider scores you could have after preparing: this can be done by looking at the differences above and judging which test matches you better.
You can convert scores using this article If you still have trouble deciding, you can email us at<EMAIL_ADDRESS>and tell us your specific situation.
If you enjoyed or benefitted from this comphrensive guide, please check out more specific advice and resources we have.


Bit-Wise Aggregate Functions
Topics
Amazon Redshift supports the following bit-wise aggregate functions:
-
BIT_AND
-
BIT_OR
-
BOOL_AND
-
BOOL_OR
BIT_AND and BIT_OR
The BIT_AND and BIT_OR functions run bit-wise AND and OR operations on all of the values in a single integer column or expression. These functions aggregate each bit of each binary value that corresponds to each integer value in the expression.
The BIT_AND function returns a result of 0
if none of the bits is set to
1 across all of the values. If one or more bits is set to 1 across all values, the
function returns an integer value. This integer is the number that corresponds to
the
binary value for the those bits.
For example, a table contains four integer values in a column: 3, 7, 10, and 22. These integers are represented in binary form as follows:
| Integer | Binary value |
|---|---|
| 3 | 11 |
| 7 | 111 |
| 10 | 1010 |
| 22 | 10110 |
A BIT_AND operation on this dataset finds that all bits are set to 1
in
the second-to-last position only. The result is a binary value of 00000010
,
which represents the integer value 2
; therefore, the BIT_AND function
returns 2
.
If you apply the BIT_OR function to the same set of integer values, the operation
looks for any value in which a 1
is found in each
position. In this case, a 1
exists in the last five positions for at least
one of the values, yielding a binary result of 00011111
; therefore, the
function returns 31
(or 16 + 8 + 4 + 2 + 1
).
BOOL_AND and BOOL_OR
The BOOL_AND and BOOL_OR functions operate on a single Boolean or integer column or
expression. These functions apply similar logic to the BIT_AND and BIT_OR functions.
For
these functions, the return type is a Boolean value (true
or
false
):
-
If all values in a set are true, the BOOL_AND function returns
true
(t
). If any value is false, the function returnsfalse
(f
). -
If any value in a set is
true
, the BOOL_OR function returnstrue
(t
). If no value in a set istrue
, the function returnsfalse
(f
).
NULLs in Bit-Wise Aggregations
When a bit-wise function is applied to a column that is nullable, any NULL values are eliminated before the function result is calculated. If no rows qualify for aggregation, the bit-wise function returns NULL. The same behavior applies to regular aggregate functions. For example:
select sum(venueseats), bit_and(venueseats) from venue where venueseats is null; sum | bit_and ------+--------- null | null (1 row)
DISTINCT Support for Bit-Wise Aggregations
Like other aggregate functions, bit-wise functions support the DISTINCT keyword. However, using DISTINCT with these functions has no impact on the results. The first instance of a value is sufficient to satisfy bitwise AND or OR operations, and it makes no difference if duplicate values are present in the expression being evaluated. Because the DISTINCT processing is likely to incur some query execution overhead, do not use DISTINCT with these functions.


--- layout: home_page title: "Hello, Internet Traveler." comments: false sharing: false footer: false ---
I'm a Southern-raised entrepreneur, writer, and aspiring programmer who doesn't watch television. Learn more about me or reach out and say hello.


Class WebhookBounceRecipientPayload
BOUNCE_RECIPIENT webhook payload. Sent to your webhook url endpoint via HTTP POST when an email caused a bounce to occur for a recipient. Save the recipient to a ban list of your server and avoid email them again.
Inherited Members
Namespace: mailslurp.Model
Assembly: mailslurp.dll
Syntax
[DataContract(Name = "WebhookBounceRecipientPayload")]
public class WebhookBounceRecipientPayload : IEquatable<WebhookBounceRecipientPayload>, IValidatableObject
Constructors
View SourceWebhookBounceRecipientPayload()
Initializes a new instance of the WebhookBounceRecipientPayload class.
Declaration
[JsonConstructor]
protected WebhookBounceRecipientPayload()
WebhookBounceRecipientPayload(string, Guid, EventNameEnum, string, string)
Initializes a new instance of the WebhookBounceRecipientPayload class.
Declaration
public WebhookBounceRecipientPayload(string messageId = null, Guid webhookId = default, WebhookBounceRecipientPayload.EventNameEnum eventName = (WebhookBounceRecipientPayload.EventNameEnum)0, string webhookName = null, string recipient = null)
Parameters
| Type | Name | Description |
|---|---|---|
| string | messageId | Idempotent message ID. Store this ID locally or in a database to prevent message duplication. (required). |
| Guid | webhookId | ID of webhook entity being triggered (required). |
| WebhookBounceRecipientPayload.EventNameEnum | eventName | Name of the event type webhook is being triggered for. (required). |
| string | webhookName | Name of the webhook being triggered. |
| string | recipient | Email address that caused a bounce. Make note of the address and try not to message it again to preserve your reputation. (required). |
Properties
View SourceEventName
Name of the event type webhook is being triggered for.
Declaration
[DataMember(Name = "eventName", IsRequired = true, EmitDefaultValue = true)]
public WebhookBounceRecipientPayload.EventNameEnum EventName { get; set; }
Property Value
| Type | Description |
|---|---|
| WebhookBounceRecipientPayload.EventNameEnum | Name of the event type webhook is being triggered for. |
MessageId
Idempotent message ID. Store this ID locally or in a database to prevent message duplication.
Declaration
[DataMember(Name = "messageId", IsRequired = true, EmitDefaultValue = true)]
public string MessageId { get; set; }
Property Value
| Type | Description |
|---|---|
| string | Idempotent message ID. Store this ID locally or in a database to prevent message duplication. |
Recipient
Email address that caused a bounce. Make note of the address and try not to message it again to preserve your reputation.
Declaration
[DataMember(Name = "recipient", IsRequired = true, EmitDefaultValue = true)]
public string Recipient { get; set; }
Property Value
| Type | Description |
|---|---|
| string | Email address that caused a bounce. Make note of the address and try not to message it again to preserve your reputation. |
WebhookId
ID of webhook entity being triggered
Declaration
[DataMember(Name = "webhookId", IsRequired = true, EmitDefaultValue = true)]
public Guid WebhookId { get; set; }
Property Value
| Type | Description |
|---|---|
| Guid | ID of webhook entity being triggered |
WebhookName
Name of the webhook being triggered
Declaration
[DataMember(Name = "webhookName", EmitDefaultValue = true)]
public string WebhookName { get; set; }
Property Value
| Type | Description |
|---|---|
| string | Name of the webhook being triggered |
Methods
View SourceEquals(WebhookBounceRecipientPayload)
Returns true if WebhookBounceRecipientPayload instances are equal
Declaration
public bool Equals(WebhookBounceRecipientPayload input)
Parameters
| Type | Name | Description |
|---|---|---|
| WebhookBounceRecipientPayload | input | Instance of WebhookBounceRecipientPayload to be compared |
Returns
| Type | Description |
|---|---|
| bool | Boolean |
Equals(object)
Returns true if objects are equal
Declaration
public override bool Equals(object input)
Parameters
| Type | Name | Description |
|---|---|---|
| object | input | Object to be compared |
Returns
| Type | Description |
|---|---|
| bool | Boolean |
Overrides
View SourceGetHashCode()
Gets the hash code
Declaration
public override int GetHashCode()
Returns
| Type | Description |
|---|---|
| int | Hash code |
Overrides
View SourceToJson()
Returns the JSON string presentation of the object
Declaration
public virtual string ToJson()
Returns
| Type | Description |
|---|---|
| string | JSON string presentation of the object |
ToString()
Returns the string presentation of the object
Declaration
public override string ToString()
Returns
| Type | Description |
|---|---|
| string | String presentation of the object |
Overrides
View SourceValidate(ValidationContext)
To validate all properties of the instance
Declaration
public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
Parameters
| Type | Name | Description |
|---|---|---|
| ValidationContext | validationContext | Validation context |
Returns
| Type | Description |
|---|---|
| IEnumerable<ValidationResult> | Validation Result |


§349-9 County functions. Each county may establish a county office on aging and a county council on aging pursuant to the Older Americans Act of 1965, as amended. [L 1976, c 217, pt of §2; am L 1979, c 136, §1(2)]


In 2012, a friend and I were crossing the road, when a truck crashed into us. It took me almost 9 months to learn how to walk again and changed my life forever.
So every day, I wake up wanting to make a difference. To me, meaning comes from giving back to society in a sustainable way while being able to provide for myself and my family. Through growing or rebuilding products and my entrepreneurial experiences in the past 15+ years globally, my passion lies in helping for-profit startups innovate towards driving meaningful change. I have held managerial and leadership roles internationally, working across a range of corporate and startup environments.
At Seldon, I lead the product management team, comprising product, design and developer relations, where I enable the company to innovate towards ethical change with a profitable business model.
I also previously co-founded and currently head the board of directors for a technology venture builder consultancy, Rosetta Digital, providing product management, engineering, design, marketing and strategy services globally.
Check out my portfolio for more information about my past work.
HQ London | Global Impact
Responsible for product management, design, developer relations and product marketing at the machine-learning scale-up.
• Chair of Board of Directors, Atlas Rosetta & Rosetta Digital
• Advisor, Harvard Business Review
• Business Mentor, IoT Tribe Accelerator
• ANHW SF and UK Leadership Team, HBS Alumni
• Mentor, MentorCruise
HQ Bristol | Global Impact
Co-founded a tech venture builder consultancy.
• Advisor, Harvard Business Review
• Business Mentor, IoT Tribe Accelerator
• ANHW SF and UK Leadership Team, HBS Alumni
• Co-Founder, Safeguard Scholar
• Co-Founder, OSEAN - Overseas South East Asian Network
• Founders' Network, TechNation
HQ San Francisco | Global Impact
Headed product delivery to ease discoverability and reduce time to launch products for all customers.
• YWCA Silicon Valley Tribute to Women Award 2019
• SAP Team Innovation Award 2020
• ANHW SF and UK Leadership Team, HBS Alumni
• ADSK Partnership Manager, Women in Product
• Professional Mentor, TechWomen
• Volunteer Regional Events Organiser, CMU Alumni
• Advisor, DSO
HQ Silicon Valley | Global Impact
Ran product across content security, analytics and cloud microservices by boosting email security.
• Advisor, DSO
• Volunteer Regional Events Organiser, CMU Alumni
Based in New York | Americas Impact
Managed a team spearheading digital transformation to reduce inefficiencies in Operations IT globally.
• Engagement Lead, DSO
• Volunteer Regional Events Organiser, CMU Alumni
HQ Washington DC | Global Impact
Built a tech, marketing and business strategy non-profit international development consultancy.
HQ Singapore | Asian Impact
Pioneered building websites to meet a budding demand for Singaporean small businesses to have simple e-commerce marketplaces.


The JSP 2.0 specification provides a portable API for evaluating
"EL Expressions": The classes and interfaces in the
javax.servlet.jsp.el
package describe and define programmatic
access to the Expression Language evaluator.
The
org.apache.commons.el
and
org.apache.commons.el.parser
packages provide an implementation of this API.


Setup WiFi Network
Available Networks:
Network Setup:
Leave password empty if unsecured WiFi network.


Significant Figures Calculator
Sun, Mar 11, 2018
Simple Bitcoin Tracker
Mon, Mar 5, 2018
An Alternative to the Standard Homework Model
Wed, Oct 25, 2017
Exploring the Methane-Ethane Eutectic System
Wed, Oct 25, 2017


Part 1. Interacting with AI: It’s all about the might of the Reset button and the importance of leveling the playfield
My favorite childhood game was Monopoly. I still play it in an app, on my iPad, in a standalone mode, against the virtual, algorithm-based AI “opponents”. Gaming against a machine is a lost cause. AI studies my, and other Human players, behavior and playing style. If I find a way to win a round, the next round, the simplest AI adjusts and reacts differently. It knows my tricks and tactics, and always patches the loopholes that led me to a win, annihilating my future chances
The dices start to fall to machine’s advantage one time after another, but Eureka! There is a solution, if I shutdown the app, on a restart – it goes back one move, and allows me to re-roll the dices, giving me a second, third or n-time chance of hard resetting machine’s logic. Like flying back in time, and asking roulette dealer to spin again, until you get the number you like. It did work for some time, until the next version of the Monopoly app had fixed that “bug”. Now, no matter how many times I shutdown the app, it rolls the dices to get the same “random” number that makes me to lose
Revising the rules of the game is natural to a human kind. New laws, amendments, earmarks, taxes and tax cuts, benefits and restrictions, games and cheats. Our survivalist behavior is to outsmart others. We excelled at tricking and dominating other species and our own. Can we outsmart a higher intelligence?
Humans use ANY means to achieve their goals.  Competing against other Humans
If resetting power or changing rules are what we do to dominate machines, what should we do to survive, compete and prosper among our kind?  Before figuring out how to live with artificial or higher intelligence we need to figure out how to survive and live well among our species. Unfortunately for us, the stakes to stay alive are rising. It’s not anymore down to our physical strength, IQ or even wealth. We are at the mercy of other Humans or AI legacy rules defining our habitat, limiting our behavior, giving/restricting the access to knowledge and resources, and provisioning us with air, water and food
Why did Steve Ballmer (former head of Microsoft) buy LA Clippers basketball team, for his retirement years, instead of buying some computer gaming company, which would have been at least relevant to his entire life’s technical management expertise? Computer gaming company would be competing with products and services against other code-based products and services; thus, their competition will be against technology, not against other Humans. In a virtual basketball game anything is possible, but try to jump 10 feet high if you are a human. Limited abilities of humans allow other humans to compete with them, you can be smarter than a fifth grader in calculating your chess moves, but try to outplay a Deep Blue chess computer. Basically, we are vultures feasting on weaknesses of others
Billionaires buy sports team for the same reason high stakes poker players play against each other rather than trying to win against casino. It is an easy choice based on probability of winning. What are your chances to win against a casino, when playing by casino’s rules? You are playing against algorithms. But what are your chances against other human players, especially if you make others agree on your set of rules? There are always will be other human players who would do worse than you
The strategy to prosper is to play against other humans on your own rules. Additional leverage is to weaken or distract the opponent, set parties (competing with you) against each other, get some money leverage (ex: financing) they cannot get, or, in an absolutely worst-case scenario, set up a reason to exit from the game (say a fight at the table) then to switch to another table where you can start anew
Part 3. Human corrals
Basketball teams are small human enterprises. Think of them as a hired 5 players at a 6 persons poker table, where you also pay with your money their leveraged bets. Casino wins regardless. Those 5 players are like high paid actors, and you are the ultimate sucker. At least you had fun, did you?
Same participation logic, works in politics. You vote in a political theater, getting entertained by politicians, sole role of whose is to keep you engaged, to spend your time and money, and make you believe in a fairy tale spectacle they play, without 3 points shots or penalty throws
In the age of information technology and pandemics, the circus comes to your couch. It is safe to play, dial the number, mail-in the check, here is your coupon, fundraising link, instant loan, voting bulletin, lottery ticket, a chance to contribute to a world you know - from information fed into your brain. Those poor chicklets never seen sun, but they get plenty of UV from the lamp above, and they look healthy and happy
From AI perspective – Humans are biowaste. We are getting farmed and raised intellectually inept without the ability to use our natural talents in avoidance's sake of touching the chicken in the next cage. With atrophied brains, sterilized stomachs, weakened muscles and genetically modified blood cells and limbs, we cannot process or digest natural food, survive in the wild, and understand the raw information without it being pre-chewed for our tastes. We are bound and locked in a tiny corral of the metaverse with no way out


--- layout: docpage title: "Documentation" is_homepage: false is_sphinx_doc: true doc-parent: "Troubleshooting" doc-title: "Find The Misbehaving Nodes" doc-header-links: ' ' doc-search-path: "../search.html" extra-footer: ' ' ---
The first step to troubleshooting a Cassandra issue is to use error messages, metrics and monitoring information to identify if the issue lies with the clients or the server and if it does lie with the server find the problematic nodes in the Cassandra cluster. The goal is to determine if this is a systemic issue (e.g. a query pattern that affects the entire cluster) or isolated to a subset of nodes (e.g. neighbors holding a shared token range or even a single node with bad hardware).
There are many sources of information that help determine where the problem lies. Some of the most common are mentioned below.
Clients of the cluster often leave the best breadcrumbs to follow. Perhaps client latencies or error rates have increased in a particular datacenter (likely eliminating other datacenter’s nodes), or clients are receiving a particular kind of error code indicating a particular kind of problem. Troubleshooters can often rule out many failure modes just by reading the error messages. In fact, many Cassandra error messages include the last coordinator contacted to help operators find nodes to start with.
Some common errors (likely culprit in parenthesis) assuming the client has similar error names as the Datastax drivers:
SyntaxError
(client). This and other QueryValidationException
indicate that the client sent a malformed request. These are rarely server
issues and usually indicate bad queries.UnavailableException
(server): This means that the Cassandra
coordinator node has rejected the query as it believes that insufficent
replica nodes are available. If many coordinators are throwing this error it
likely means that there really are (typically) multiple nodes down in the
cluster and you can identify them using nodetool status If only a single coordinator is throwing this error it may
mean that node has been partitioned from the rest.OperationTimedOutException
(server): This is the most frequent
timeout message raised when clients set timeouts and means that the query
took longer than the supplied timeout. This is a client side timeout
meaning that it took longer than the client specified timeout. The error
message will include the coordinator node that was last tried which is
usually a good starting point. This error usually indicates either
aggressive client timeout values or latent server coordinators/replicas.ReadTimeoutException
or WriteTimeoutException
(server): These
are raised when clients do not specify lower timeouts and there is a
coordinator timeouts based on the values supplied in the cassandra.yaml
configuration file. They usually indicate a serious server side problem as
the default values are usually multiple seconds.If you have Cassandra metrics reporting to a centralized location such as Graphite or Grafana you can typically use those to narrow down the problem. At this stage narrowing down the issue to a particular datacenter, rack, or even group of nodes is the main goal. Some helpful metrics to look at are:
Cassandra refers to internode messaging errors as “drops”, and provided a number of Dropped Message Metrics to help narrow down errors. If particular nodes are dropping messages actively, they are likely related to the issue.
For timeouts or latency related issues you can start with Table
Metrics by comparing Coordinator level metrics e.g.
CoordinatorReadLatency
or CoordinatorWriteLatency
with their associated
replica metrics e.g. ReadLatency
or WriteLatency
. Issues usually show
up on the 99th
percentile before they show up on the 50th
percentile or
the mean
. While maximum
coordinator latencies are not typically very
helpful due to the exponentially decaying reservoir used internally to produce
metrics, maximum
replica latencies that correlate with increased 99th
percentiles on coordinators can help narrow down the problem.
There are usually three main possibilities:
It’s important to remember that depending on the client’s load balancing
behavior and consistency levels coordinator and replica metrics may or may
not correlate. In particular if you use TokenAware
policies the same
node’s coordinator and replica latencies will often increase together, but if
you just use normal DCAwareRoundRobin
coordinator latencies can increase
with unrelated replica node’s latencies. For example:
TokenAware
+ LOCAL_ONE
: should always have coordinator and replica
latencies on the same node rise togetherTokenAware
+ LOCAL_QUORUM
: should always have coordinator and
multiple replica latencies rise together in the same datacenter.TokenAware
+ QUORUM
: replica latencies in other datacenters can
affect coordinator latencies.DCAwareRoundRobin
+ LOCAL_ONE
: coordinator latencies and unrelated
replica node’s latencies will rise together.DCAwareRoundRobin
+ LOCAL_QUORUM
: different coordinator and replica
latencies will rise together with little correlation.Sometimes the Table query rate metrics can help
narrow down load issues as “small” increase in coordinator queries per second
(QPS) may correlate with a very large increase in replica level QPS. This most
often happens with BATCH
writes, where a client may send a single BATCH
query that might contain 50 statements in it, which if you have 9 copies (RF=3,
three datacenters) means that every coordinator BATCH
write turns into 450
replica writes! This is why keeping BATCH
’s to the same partition is so
critical, otherwise you can exhaust significant CPU capacitity with a “single”
query.
Once you have narrowed down the problem as much as possible (datacenter, rack , node), login to one of the nodes using SSH and proceed to debug using logs, nodetool, and os tools. If you are not able to login you may still have access to logs and nodetool remotely.


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{% extends '!layout.html' %} {% block header %} {% if branch == "master" %}
Warning
You are reading the docs for the (unreleased) master branch. See also the docs for the latest release.
Info
You are reading the docs for the {{ branch }} release. See also the docs for the master branch.


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Hi, I'm Manali - A User Experience Designer and a Frontend Developer. Graduate student of Human Computer Interaction from Indiana University, Indianapolis. I am actively looking for full-time positions as a User Experience Designer/User Researcher.
I like minimalist design approach of iOS designs as well as intuitive designs of Andriod. Can't wait to get my hands dirty in designing for Wearable Devices and Augmented Reality. I believe there is a lot of data lying around for people to give it a meaning with data visualization. So that makes it another area of my interest. To keep my brain sharp, I practice frontend development skills by taking up development work in the Convergent Media and Exploratory Technology Lab as a Research Assistant.
 I like to interact with people from different cultures, enjoy the local food and dance, and understand their behaviour.


_XCTAssertionType Constants Reference
| Declared in | XCTestAssertionsImpl.h |
|---|
_XCTAssertionType
Definition
typedef NS_ENUM(NSUInteger, _XCTAssertionType ) {
_XCTAssertion_Fail,
_XCTAssertion_Nil,
_XCTAssertion_NotNil,
_XCTAssertion_EqualObjects,
_XCTAssertion_NotEqualObjects,
_XCTAssertion_Equal,
_XCTAssertion_NotEqual,
_XCTAssertion_EqualWithAccuracy,
_XCTAssertion_NotEqualWithAccuracy,
_XCTAssertion_GreaterThan,
_XCTAssertion_GreaterThanOrEqual,
_XCTAssertion_LessThan,
_XCTAssertion_LessThanOrEqual,
_XCTAssertion_True,
_XCTAssertion_False,
_XCTAssertion_Throws,
_XCTAssertion_ThrowsSpecific,
_XCTAssertion_ThrowsSpecificNamed,
_XCTAssertion_NoThrow,
_XCTAssertion_NoThrowSpecific,
_XCTAssertion_NoThrowSpecificNamed,
};
Constants
_XCTAssertion_Fail
-
Declared In
XCTestAssertionsImpl.h
. _XCTAssertion_Nil
-
Declared In
XCTestAssertionsImpl.h
. _XCTAssertion_NotNil
-
Declared In
XCTestAssertionsImpl.h
. _XCTAssertion_EqualObjects
-
Declared In
XCTestAssertionsImpl.h
. _XCTAssertion_NotEqualObjects
-
Declared In
XCTestAssertionsImpl.h
. _XCTAssertion_Equal
-
Declared In
XCTestAssertionsImpl.h
. _XCTAssertion_NotEqual
-
Declared In
XCTestAssertionsImpl.h
. _XCTAssertion_EqualWithAccuracy
-
Declared In
XCTestAssertionsImpl.h
. _XCTAssertion_NotEqualWithAccuracy
-
Declared In
XCTestAssertionsImpl.h
. _XCTAssertion_GreaterThan
-
Declared In
XCTestAssertionsImpl.h
. _XCTAssertion_GreaterThanOrEqual
-
Declared In
XCTestAssertionsImpl.h
. _XCTAssertion_LessThan
-
Declared In
XCTestAssertionsImpl.h
. _XCTAssertion_LessThanOrEqual
-
Declared In
XCTestAssertionsImpl.h
. _XCTAssertion_True
-
Declared In
XCTestAssertionsImpl.h
. _XCTAssertion_False
-
Declared In
XCTestAssertionsImpl.h
. _XCTAssertion_Throws
-
Declared In
XCTestAssertionsImpl.h
. _XCTAssertion_ThrowsSpecific
-
Declared In
XCTestAssertionsImpl.h
. _XCTAssertion_ThrowsSpecificNamed
-
Declared In
XCTestAssertionsImpl.h
. _XCTAssertion_NoThrow
-
Declared In
XCTestAssertionsImpl.h
. _XCTAssertion_NoThrowSpecific
-
Declared In
XCTestAssertionsImpl.h
. _XCTAssertion_NoThrowSpecificNamed
-
Declared In
XCTestAssertionsImpl.h
.


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Dillon Drenzek
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@string/logo-type is an educational ecosystem targeted at children of all ages
@string/logo-type offers apps for education and adaptable quizzes for evaluation. Quiz results can be stored for apps behavior refinement.
@string/logo-type is not meant to replace formal education but to satisfy intrinsic interests and curiosity and keep the mind in shape.
@string/learn-by-playing
@string/learn-by-playing-summary1
Do not forget the fun part. Focus on playing and get learning as byproduct.
for all ages
Learning is an ongoing process lasting for entire life and this is what makes us homo sapiens.
Learning helps shaping young minds and keeping in shape experienced ones.
@string/three-no
- @string/no-ads
- @string/no-in-app-payment
- @string/no-spyware
have fun and learn by playing
Play is a vital part of humans social, cognitive, physical and emotional development. And this is true for all superior mammalian species; anybody saw a puppy playing and learning.
Is like brain needs a reason to memorize facts and having fun is a good reason indeed. Just focus on playing and brain will do its job effortlessly. Learning should not be a job or a task.
pleasure leads to repetition and repetition leads to mastery
for children of all ages
Children are such curious creatures. They explore, question, and wonder, and by doing so, learn. Lets keep alive the child from us; is our best part.
Learning is an ongoing process lasting for entire life and this is what makes us humans. @string/site-name helps shaping young minds and keeping in shape the experienced ones.
Curiosity is the driving force of intellect.Pam Schiller
@string/three-no-description
NO ADS
@string/no-ads-description No Ads Manifest.
NO IN-APP PAYMENT
@string/no-in-app-payment-description
NO SPYWARE
@string/no-spyware-description


Piping to 'rm', a command that doesn't read stdin. Wrong command or missing xargs?
ls | echo # Want to print result
cat files | rm # Want to delete items from a file
find . -type f | cp dir # Want to process 'find' output
rm file | true # Want to ignore errors
ls
cat files | while IFS= read -r file; do rm -- "$file"; done
find . -type f -exec cp {} dir \;
rm file || true
You are piping to one of several commands that don't read from stdin.
This may happen when:
echo
where cat
was intended.|
on the previous line.xargs
, because stdin should be passed as positional parameters instead (use xargs -0
if at all possible).||
instead of |
Check your logic, and rewrite the command so data is passed correctly.
If you've overridden a command to return output, you can either rename it to make this obvious, or [[ignore]] this message.


Here are all the command line parameters for the Dark Forces executable:
(ordered by probable usefulness)
| Parameter | Description |
| -ugob | use an user gob file (where gob=your gob file) |
| -shots | enable screen shot mode (use Print Screen key) |
| -c | disable cutscenes |
| -llevel | play a particular level (where level=yourlevel) |
| -xd | specify CD-ROM drive letter (where d=drive) |
| -f | don't check to see if FILES= is set high enough |
| -t | autotest mode (runs all levels briefly) |
| -g | create a text file with a list of all files that were opened during the running of the game |


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[gecode-users] CSPs with bulky static data
Christian Schulte
schulte at imit.kth.se
Fri Jul 28 13:45:12 CEST 2006
Dear Torsten,
yes indeed you only need to copy data structures that contain variables
(which are typically just arrays of variables). Anything else is under your
control.
A more general basline is: whatever you want to be specific to a space you
have to copy yourself. The rest you just share among all spaces.
Cheers
Christian
-----Original Message-----
From: users-bounces at gecode.org [mailto:users-bounces at gecode.org] On Behalf
Of Torsten Anders
Sent: Friday, July 28, 2006 1:11 PM
To: users at gecode.org
Subject: [gecode-users] CSPs with bulky static data
Dear all,
I am an Oz programmer with no experience in Gecode yet, please forgive
my newbie question.
Many of my Oz CSPs eat *very* much memory because I am using large data
structures. Still, most data does not change at all during the search
process, but is still copied because it is part of the script. I do
understand that the Oz constraint store _implicitly_ incorporates
whatever value is part of the script (computational spaces in Oz
encapsulate speculative computations on any Oz data and each variable
can cause a fail).
I saw that in Gecode, on the other hand, variables are _explicitly_
handed to the computational space. Does this mean that the Gecode user
has explicit control what variable is incorporated in the constraint
store (and is copied during the search process)? In other words, can a
Gecode CSP involve large (mainly static) data structures without
copying all the static data?
Thank you very much!
Best,
Torsten
PS: I figure I could at least reduce my problem also within Oz by
putting my data structure outside the script and communicating between
my script and this data only via a port. Yet, that complicates the
definition of the CSP. Moreover, I need potentially all information
contained in the data structure, e.g., to decide to which variables I
what to apply constraints. I do not know whether this communication via
a port also affects what is stored in the constraint store.
--
Torsten Anders
Sonic Arts Research Centre Queen's University Belfast Frankstr. 49
D-50996 Köln
Tel: +49-221-3980750
http://www.torsten-anders.de
http://strasheela.sourceforge.net
_______________________________________________
Gecode users mailing list
users at gecode.org https://www.gecode.org/mailman/listinfo/gecode-users
More information about the gecode-users
mailing list


Assembly Instructions
You will need:
- 1 DaisyDriver PCB
- (optional) 1 DaisyDriver solder stencil
- 1 BoM, as listed in the DaisyDriver design files
- 200 ml Isopropanol
- Solder paste
- 2 hotplates capable of maintaining temperatures of 50℃ to 400℃
- 1 steel or aluminium plate large enough to support the DaisyDriver
- 2 pairs of spade tipped tweezers
- 1 pair safety glasses
- 1 pair heat resistant gloves
Soldering Procedure
- Set one hotplate next to the other and ensure the tops are clean and free from distortion. Turn one on to 100℃, and the other to 350℃. Allow ample time for them to come to temperature.
- Apply solder paste using either a stencil or an applicator syringe. A stencil is recommended due to the high accuracy of paste deposition it offers, as well as the superior evenness of the applied paste thickness.
- Place surface mount components on the board, noting that slight errors in the positions of the components will generally be corrected by the surface tension of the solder at reflow.
- Wearing the safety gloves and glasses, position the metal plate on the 100℃ plate, and allow it to come to temperature. Note that thermal distortion of the plate may initially occur, which can be corrected by pressing down on the corners of the plate with the tweezers.
- Once the plate has come to temperature, place the PCB on it and wait for up to two minutes for it to heat up. During this time, thermal distortions can be corrected by pushing gently on the corners of the PCB, in the same manner as step 4. The solder paste may change slightly in appearance, and the flux may activate.
- Once the PCB has come to temperature on the 100℃ metal plate, transfer the PCB on the metal plate to the 350℃ hotplate. Correct thermal distortions as before, and observe the pads of the PCB carefully. The solder paste should begin to melt within 2 minutes, and be fully molten within 3. Any pads that do not reflow within 3 minutes can be corrected by hand using a rework station. Take care also that the silkscreen is not scorched before the PCB reflows; if this occurs, then a redesign of the board may be necessary.
- Transfer the PCB and the metal plate back to the 100℃ hotplate for approximately one minute and then to a wire rack. This step is to avoid thermal shock to the components. Once the PCB has cooled to around 50℃, the metal plate can be safely extracted.
- Repeat steps 1-7 with all further PCBs to be soldered, then turn off the hotplates and allow them to cool. Wash the PCBs with isopropanol and allow to dry.
- Solder any remaining through-hole components in by hand.


|
cds
1.2.0
|
Array of Hazard Pointer guards. More...
#include <cds/gc/hp.h>
Data Structures | |
| struct | rebind |
Rebind array for other size Count2 . More... |
Public Member Functions | |
| template<typename T > | |
| T | protect (size_t nIndex, std::atomic< T > const &toGuard) |
Protects a pointer of type atomic<T*> | |
| template<typename T , class Func > | |
| T | protect (size_t nIndex, std::atomic< T > const &toGuard, Func f) |
Protects a pointer of type atomic<T*> | |
| template<typename T > | |
| T * | assign (size_t nIndex, T *p) |
Store to the slot nIndex . | |
| template<typename T , int BITMASK> | |
| T * | assign (size_t nIndex, cds::details::marked_ptr< T, BITMASK > p) |
Store marked pointer p to the guard. | |
| void | clear (size_t nIndex) |
Clear value of the slot nIndex . | |
| template<typename T > | |
| T * | get (size_t nIndex) const |
Get current value of slot nIndex . | |
| size_t | capacity () const |
| Capacity of the guard array. | |
| Public Member Functions inherited from cds::gc::hzp::AutoHPArray< Count > | |
| AutoHPArray (ThreadGC &mgr) | |
Allocates array of HP guard from mgr . | |
| ~AutoHPArray () | |
| Frees array of HP guard. | |
| ThreadGC & | getGC () const |
| Returns thread GC. |
Array of Hazard Pointer guards.
This class is a wrapper for hzp::AutoHPArray template. Template parameter Count
defines the size of HP array.
|
inline |
Store to
the slot nIndex
.
The function equals to a simple assignment, no loop is performed.
|
inline |
Store marked pointer p
to the guard.
The function equals to a simple assignment of p.ptr()
, no loop is performed. Can be used for a marked pointer that cannot be changed concurrently.
|
inline |
Protects a pointer of type atomic<T*>
Return the value of toGuard
The function tries to load toGuard
and to store it to the slot nIndex
repeatedly until the guard's value equals toGuard
|
inline |
Protects a pointer of type atomic<T*>
Return the value of toGuard
The function tries to load toGuard
and to store it to the slot nIndex
repeatedly until the guard's value equals toGuard
The function is useful for intrusive containers when toGuard
is a node pointer that should be converted to a pointer to the value type before guarding. The parameter f
of type Func is a functor that makes this conversion:
Really, the result of f( toGuard.load() )
is assigned to the hazard pointer.


What is the running time for Insertion Sort when the input array has values that are in reverse sort order?
\Theta(n^2)
\Theta(n)
\Theta(\log n)
\Theta(n \log n)
On each iteration, the i
th record will have
to move to the start of the array.
This is the worst case.


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Below Are Some Of Few Projects I Have Managed To Developed
I have also attained different Institute of learning as described Below
As a Graduate, I had a passion of taking a course in programming to enhance my career path, I have been part timing with different companies ranging from Tech, Agric and SME’s. However, is from these companies that influenced me to continue with programming and my idols like founder of Microsoft (Bill Gate), founder of Alibaba.com and Founder of Facebook(Mark Zarburg) all these were my aspirant to me
In fact, what I want to express formally here is how wonderful programming is! The only regret I have is not taking it much earlier (if only I had done such a course a ago!!). And indeed now I enjoy at it’s pre-stage of programming
In addition, a lot of the stuff here can be applied back in business context throughout East Africa. Not everything but quite a fair bit in general. In nut-shell, upon completion, I would like to develop and design approach of changing my community through technology so that access to market, information and services are easily availed near them.
Below are some of my Hobbies outside Job Content
My Updated Skills


{% include get-widget-data-and-options widget="search" include=include %} {%- if widget_options.inline -%}{%- else -%}


Gather together your evidence and any other information you need.
You'll have a 'to-do' on your Universal Credit account to arrange an interview to confirm your identity.
When you do that mention you also need an interview to prove you can apply for benefits in the UK. This may happen at the same time as your identity interview or on a different day.
Bring the evidence listed above to your interview.
Save and return to Universal Credit
You'll be able to see this information again from your Universal Credit 'to-do' at any time.


Get HummingbirdView Documentation
Version 1.0
Often, developers use only 10% of the features of a framework 90% of the time. Hummingbird is a compact framework that only concentrates on the most heavily used features - from grids and buttons to tabs and accordions.
Hummingbird is built fluidly and in an hierarchical manner, transitioning easily from big screens to tablets and smartphones, with no effort at all and no need for writing lots of addtional lines of media queries.
Built with object-oriented principles in mind, most of the properties of this framework are set at lower levels and inherited by higher level elements. Customisation of elements is done by general modifiers that can be mixed on the same element, making the code reusable.


New electrodes could increase efficiency of electric vehicles and aircraft
| Source: | Texas A&M University |
| Summary: | The rise in popularity of electric vehicles and aircraft presents the possibility of moving away from fossil fuels toward a more sustainable future. While significant technological advancements have dramatically increased the efficiency of these vehicles, there are still several issues standing in the way of widespread adoption. |
The rise in popularity of electric vehicles and aircraft presents the possibility of moving away from fossil fuels toward a more sustainable future. While significant technological advancements have dramatically increased the efficiency of these vehicles, there are still several issues standing in the way of widespread adoption.
One of the most significant of these challenges has to do with mass, as even the most current electric vehicle batteries and supercapacitors are incredibly heavy. A research team from the Texas A&M University College of Engineering is approaching the mass problem from a unique angle.
Most of the research aimed at lowering the mass of electric vehicles has focused on increasing the energy density, thus reducing the weight of the battery or supercapacitor itself. However, a team led by Dr. Jodie Lutkenhaus, professor in the Artie McFerrin Department of Chemical Engineering, believes that lighter electric vehicles and aircraft can be achieved by storing energy within the structural body panels. This approach presents its own set of technical challenges, as it requires the development of batteries and supercapacitors with the same sort of mechanical properties as the structural body panels. Specifically, batteries and supercapacitor electrodes are often formed with brittle materials and are not mechanically strong.
In an article published in Matter, the research team described the process of creating new supercapacitor electrodes that have drastically improved mechanical properties. In this work, the research team was able to create very strong and stiff electrodes based on dopamine functionalized graphene and Kevlar nanofibers. Dopamine, which is also a neurotransmitter, is a highly adhesive molecule that mimics the proteins that allow mussels to stick to virtually any surface. The use of dopamine and calcium ions leads to a significant improvement in mechanical performance.
In fact, in the article, researchers report supercapacitor electrodes with the highest, to date, multifunctional efficiency (a metric that evaluates a multifunctional material based on both mechanical and electrochemical performance) for graphene-based electrodes.
This research leads to an entirely new family of structural electrodes, which opens the door to the development of lighter electric vehicles and aircraft.
While this work mostly focused on supercapacitors, Lutkenhaus hopes to translate the research into creating sturdy, stiff batteries.
make a difference: sponsored opportunity
Story Source:
Materials provided by Texas A&M University.
Note: Content may be edited for style and length.
Journal Reference:
- Paraskevi Flouda, Smit A. Shah, Dimitris C. Lagoudas, Micah J. Green, Jodie L. Lutkenhaus. Highly Multifunctional Dopamine-Functionalized Reduced Graphene Oxide Supercapacitors. Matter, 2019; DOI: 10.1016/j.matt.2019.09.017
Cite This Page:
| MLA | Texas A&M University. "New electrodes could increase efficiency of electric vehicles and aircraft." ScienceDaily. ScienceDaily, 22 November 2019. <www.sciencedaily.com/releases/2019/11/191122122513.htm>. |
| APA | Texas A&M University. (2019, November 22). New electrodes could increase efficiency of electric vehicles and aircraft. ScienceDaily. Retrieved November 25, 2019 from www.sciencedaily.com/releases/2019/11/191122122513.htm |
| Chicago | Texas A&M University. "New electrodes could increase efficiency of electric vehicles and aircraft." ScienceDaily. www.sciencedaily.com/releases/2019/11/191122122513.htm (accessed November 25, 2019). |