"200 Calories" on a nutrition label doesn't describe the total flammable caloric content. I explore the differences between digestible and flammable calories using a homemade calorimeter with glass windows.
Monday, February 22, 2021
Sunday, January 17, 2021
Join me in brainstorming and building a bite force sensor that allows paraplegic musicians to smoothly control an expression pedal. This video will include construction tips and tricks, methods, material selection, and a little design philosophy.Tiny linear potentiometer used in final design: https://www.digikey.com/en/products/detail/bourns-inc/3046L-1-103/3781580 Spring-loaded linear potentiometer: https://www.digikey.com/en/products/detail/tt-electronics-bi/404R10KL1-0/2408603 Sil-Poxy for bonding silicone rubber to itself and other materials: https://www.smooth-on.com/product-line/sil-poxy/ Sorta Clear 40 - Platinum-cure silicone molding: https://www.smooth-on.com/products/sorta-clear-40/ Light-cure 3311 adhesive: https://www.mcmaster.com/1700A253/ (expensive, but this tube will last a long time) Blue lasers on eBay "5mW" *wink* https://www.ebay.com/itm/3-Packs-900Mile-Strong-Laser-Pointer-Pen-Green-Blue-Red-Light-Visible-Beam-Lazer/174479770737 Braided shield, highly flexible, 4-conductor cable: https://www.digikey.com/en/products/detail/tensility-international-corp/30-00218/5270175 Fabric reinforced silicone sheet: https://www.mcmaster.com/8612K51/ Mechanical CAD on github: https://github.com/benkrasnow/BiteSensor Support Applied Science on Patreon: https://www.patreon.com/AppliedScience
Sunday, November 15, 2020
Notes: 1. The Rugate filters look especially good in polarized light because the reflection from the silicon wafer is reduced, but the reflection from the filter remains strong. I noticed this while holding the wafer in front of my computer monitor. Later, when showing it to friends, the color intensity was poor. Their monitor must have been horizontally polarized, so holding the wafer low, and tilting it upward didn't work! Some monitors are horizontally polarized, and some are vertical. 2. The magnet used to hold down the PTFE cup to the wafer may have a very slight impact on the etch process. The dramatic shift in filter performance at the periphery is due to O-ring restricting the conductive etchant to a sharp edge, creating an electrical field concentration. Outstanding visual Fourier series tutorial:http://www.jezzamon.com/fourier/index.html LR-1 spectrometer: http://www.aseq-instruments.com/LR1.html p-type wafers on eBay. (You have to hunt around and check the photos for info on the label attached to the box of wafers. Be sure to get wafers less than 0.01 ohm-cm) eg https://www.ebay.com/itm/25-silicon-wafer-P-type-150mm-100-sumco/263441166009 n-type wafers are photosensitive during the etch process. Online graphing calculator page from this video: https://www.desmos.com/calculator/hiju8zdqfz Original Desmos page that I used: https://www.desmos.com/calculator/qpnz9celzf Code for Keithley 2450 control and processing.org waveform generation: https://github.com/benkrasnow/Porous_Silicon_Optics Fourier transform to understand optical coatings: http://www.willeyoptical.com/pdfs/92_180.pdf Porous silicon refs: https://www.rp-photonics.com/rugate_filters.html https://www.intechopen.com/books/porosity-process-technologies-and-applications/porous-silicon https://sci-hub.se/https://doi.org/10.1016/j.mee.2011.03.143 https://sci-hub.se/https://doi.org/10.1080/10408436.2010.495446 https://sci-hub.se/https://doi.org/10.1007/978-3-319-71381-6_2 https://sci-hub.se/https://doi.org/10.1364/AO.44.005415 https://sci-hub.se/10.1364/OE.16.015531 https://sci-hub.se/https://doi.org/10.1002/adma.19940061214 https://sci-hub.se/https://doi.org/10.1063/1.2906337
Sunday, September 20, 2020
A special 100nm thick window allows 25 KeV electrons to pass from a vacuum tube to the atmosphere where they hit a fluorescent screen -- a CRT in air!
Tuesday, September 8, 2020
Cerasolzer technical info: http://cerasolzer.com/cerasolzer/basic_info_gb.html
S-bond technical info: https://www.s-bond.com/solutions-and-service/ultrasonic-soldering/ultrasonic-solder-materials/
Overview of active soldering process: https://sci-hub.tw/10.5772/intechopen.82382
Another good overview: https://www.intechopen.com/books/recent-progress-in-soldering-materials/recent-advances-in-solderability-of-ceramic-and-metallic-materials-with-application-of-active-solder
Discussion of Sn - La solders: https://www.hindawi.com/journals/amse/2015/269167/
Sn - Ti phase diagram: https://sci-hub.tw/https://doi.org/10.1007/s11669-010-9663-2
This patent has the key list of ingredients (not just broad ranges) listed at paragraph 45: https://patents.google.com/patent/US20160204303A1/en