~j0ule

[url=https://sci-hub.se/10.1007/s12274-018-2139-0]https://sci-hub.se/10.1007/s12274-018-2139-0[/url] "Low-cost room-temperature sodium-ion batteries (SIBs) are expected to promote the development of stationary ene rgy storage applications. Howeve

This is a list of active, and solved, or wontfix issues for Civilpedia. Development help is welcome! Please reach out to @joule if interested.   [b]Feedback & Improvements[/b] [ul][li]Use SMS not email, with active hours[/li][/ul]

[m]⍁LaTeX{} + e^{i⍁pi} + 1 = NaN[/m] Just sit ⍁ right back and you'll hear a tale a [b]tale of[/b] a fateful ⍁ trip, that [i]started[/i] from this [url=https://frozen.port]frozen port,[/url] aboard this [u]fun road[/u] trip.&#

I hope to share with you a sunbeam of warmth in our world of cold and darkness. [img]../storage/fragment_images/45021105101430650_c1c2e338ae21da28e4392743d527f3aa.jpg[/img]May you find this to be as helpful, as I have found these truths to be myself!&

Lately I've been putting the finishing touches on this website. Some clever java-script hacks to allow the back button to work with endless scrolling. Another neat javascript thing I implemented was loading images asynchronously as you scroll down a

I did some experiments today with trying to detect propane using a 3.33um filter. This filter is selective for methane, which should be inside "natural gas" in detectable amounts. My first experiment was to see if I could see the gas c

The control PCB for the HandyVent is a simple circuit board made with through-hole components that are easy to solder. This short page will help you understand how to build it.  [img]../storage/fragment_images/10973986380014022_70ab1fa4b23a0295627249

Both face shields, and the PET plastic sheets which they are made from are in short supply right now. This project will let you build a face shield from any thin translucent plastic, even a bread bag, by spreading the plastic tightly with a 3D printed pa

It is a tale very commonly told that Lead Acid batteries are a “cheaper” solution than Lithium batteries for off-grid and solar storage. As of 2019 that is patently false, and the purpose of this article is to explain how this remarkable fact comes to

In 1895, a professor by the name of Wilhelm Conrad Rontgen discovered a source of invisible rays which were capable of penetrating materials not normally translucent to ordinary light. Not only this, but these mysterious rays also caused certain chemicals

The goal of this project was to build an inexpensive portable x-ray machine, since such a device didn’t seem to exist! Odd, since such a machine could prove to be very useful in remote or underequipped areas such as army camps or poorer countries. T

Invented in 1913 by William D. Coolidge, the Coolidge tube is by far the most popular method used to generate x-rays. Essentially it’s just a thermionic diode, but one optimized for high voltages and high powers. Like a thermionic diode a Coolidge tube

The 2x2A is a vacuum rectifier that, before the advent of the silicon diode, was used to rectify the high voltage needed for fun things such as television tubes. Now the silicon diode replaced the 2×2 nearly 40 years ago at the time of this writing, but

Fields are an imaginary concept where, at every point in space (be it 2d, 3d, or any-d), there exists a value at that point. What this value represents is up to you, as fields are only imaginary abstractions! (yes, including electric fields too). [t]S

Sets are a tool that we can use to keep track of objects. Whether the objects are numbers, kites, rocks, or starfish, it doesn't matter! A set is a very helpful abstraction that makes it easy for us to describe large collections of objects by their p

The decimal numerals themselves have no real meaning. After all, what is "the number 5?" Has anyone ever seen, heard or touched a "number 5?" [img|h=200]../storage/fragment_images/34676523710326480_88919ab90b0838c8ed7740c711af054d

[b]Q: What is Polaris?[/b] A: Polaris is an open source augmented reality headset meant as a development platform for interaction prototyping. [img]../storage/fragment_images/60059467839583336_3759e61d96ee5798a9c6ee9245b1b71b.jpg[/img][b]Q: How ca

It's just about nightfall, and a bright orange sky casts long shadows upon a meandering road. Two hitchhikers, weary from a long day of collecting fruit, hoist upon their shoulders burlap sacks, and head toward a nearby cavern. "Ada?"&#

This is a short how-to guide on creating a positive pressure PPE suit, as imagined by [url=https://robots-everywhere.com/re_wiki/pub/web/Cookbook.SaltMask.html]Matteo Borri[/url]. Positive pressure suits are very handy for isolating yourself from toxi

Nonionizing radiation, the stuff of microwave, infrared and visible light doesn’t have the energy needed to break chemical bonds, so we may sit out in the sun and get bombarded with a thousand watts and feel no ill effects. Once we reach ultraviolet tho

A camera that captures video footage of CO2, NOx, SO2 and other gas emissions from from vehicles, power plants, gas flares, would be pretty cool. Let's make one! [img]../storage/fragment_images/63957192955728260_037c0ce694352e685bb52f296e103ded.j

With the spread of COVID-19 there is a need for ventilators to help people with severe lung inflammation survive the disease. The USA healthcare system has a big shortage of these now when they are needed dearly. We set out to design a [b]reusable[/

Disposable cameras are a great source of moderately high voltage inverters. The flash circuit takes 1.5V and turns it into anywhere from 300 to 350 volts, and what's nice about these cameras is that you can go to any pharmacy, and if you ask nicely,

Never put an electrolytic capacitor in backwards. [youtube]3b7mjukhTyQ[/youtube][t]Why it happens[/t]Electrolytic capacitors are constructed using an electrolyte-soaked piece of paper between two strips of aluminum foil. One piece of foil is oxidized