andlier
Joined 12 years ago
Karma
99
Submissions
30
Member since
Mar 3
Embedded systems hacker, especially miniature hardware electronics and wireless systems.
View on Hacker NewsRecent submissions
Comment · 2 months ago
Same, wanted to read it, but ended up just being flabbergasted about the image-rendering, was it my screen? was it intentional, by design? Just closed the page without reading a word and came here to check if other people had the same impression...
Comment · 1 year ago
Fun fact, there are databases of the exact frequency vs. time and it can be used to accurately time stamp audio/video recordings by correlating the ~50/60hz noise in the recording with the database. Good writeup on the technique and how it has been used in court cases: https://robertheaton.com/enf/
Comment · 4 years ago
A political bet, with enough funding it might make it so… https://www.washingtonpost.com/climate-solutions/japan-hydro...
Comment · 5 years ago
This reminded me of the extended range with reversed ski box for tesla. https://electrek.co/2020/03/24/tesla-model-3-roof-rack-box-r...
Comment · 7 years ago
No sure how these guys (https://www.xethru.com/) are doing financially, but they sell development kits for respiration sensors etc.
Comment · 8 years ago
Microplastics from car tyres seems to be a big source as well: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5664766/
Comment · 8 years ago
Protactinium
Comment · 8 years ago
After a quick napkin calculation+google it seems the sun has around 20kW of power per square centimeter. So not entirely unfeasible that a cooler star, or a nuclear reactor is closer to the typical 10-100W/cm2 of a modern cpu/gpu. Still some orders of magnitude off from our closest star. (Hope calculation is correct)
Comment · 8 years ago
The issue with the «chopping» is noise level. Counter rotating propellers are more efficient than a single propeller. «Contra-rotating propellers have been found to be between 6% and 16% more efficient than normal propellers.» https://en.m.wikipedia.org/wiki/Contra-rotating_propellers
Comment · 8 years ago
“Simply put, unleaded fuel burns less smoothly than leaded and the toluene and benzene, which is added to the fuel to act as a lead substitute, burns to form what are called peroxides. Unfortunately peroxides are inherently unstable and explode, forming shock waves that cause detonation. This explains why engines designed to run on unleaded from the outset feature sophisticated knock sensors, which retard the ignition setting at the onset of harmful detonation.”
https://www.classiccars4sale.net/classic-car-how-to-guides/r...
Comment · 8 years ago
Zero Kelvin is still a different league of special scientifically speaking.
Comment · 8 years ago
Resistive power losses in the battery pack, drive inverter, motor, and associated wiring are proportional to the square of the current. Doubling the motor current doubles the torque but quadruples the losses.
Comment · 8 years ago
Actually most new (<5 year old) petrol cars use direct injection which emits much more fine soot particles than diesel with particle filter. In EU particle filter for petrol cars is only mandatory from 2017. Also worrysome that most of the particles are of the ultrafine type which is the most dangerous in terms of cancer-risk etc. https://www.transportenvironment.org/press/new-petrol-engine...
Comment · 9 years ago
Apparently this discussion has been on here before: https://news.ycombinator.com/item?id=11896883
Comment · 9 years ago
ehh, muddy.ashes.pardon maps to US Holocaust Memorial Museum... (https://www.ushmm.org/) insensitive for sure, is that just a coincidence?