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…
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...
No sure how these guys (https://www.xethru.com/) are doing financially, but they sell development kits for respiration sensors etc.
Microplastics from car tyres seems to be a big source as well: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5664766/
Protactinium
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…
“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…
Zero Kelvin is still a different league of special scientifically speaking.
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.
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…
Apparently this discussion has been on here before: https://news.ycombinator.com/item?id=11896883
ehh, muddy.ashes.pardon maps to US Holocaust Memorial Museum... (https://www.ushmm.org/) insensitive for sure, is that just a coincidence?
Even if we covered the earth in windmills, we'd still only affect the lowest 100-200m of the atmosphere. And windmills can only extract 50% of the winds energy. I'm thinking a forest full of trees might even reduce the…
Me five. This isn't the first time I've had this happen.
I'm happy with my Yaesu VX-6R, bought it 11 years ago, same day I got my license. Incredibly sturdy and amazing build quality, submersible to 1 meter, die-cast aluminium and O-ring sealed ear-plug/antenna connections.…
If each cell is connected to the bus bars with fuse wire (like in the Tesla battery pack for instance) this connection diagram seems valid. Same way it is connected in the car/powerwall packs that tesla makes at least.
I'm a bit tired of all these CO2 comparisons regarding electric vehicles. If we put the CO2 emissions aside, there are so many other benefits moving to EV's. Especially reduced local pollution in cities such as NOx, VOC…
[0] Estimate about half of the particulate emissions comes from non-combustion sources (brake wear, tire/road wear, dust re-suspension). Interestingly 16-55% of these particle emissions in city-areas comes from brake…
I'm trying https://www.jottacloud.com now, they have an unlimited plan for ~$70/year. Funny story; They previously had a clause in the terms about restricting storage space for users with abnormal usage patterns. A…
Just be sure to read the datasheet carefully. That particular capacitor is only ~120uF at typical 3.3V DC voltage. At 5V DC (which isn't really advisable for a 6.3V rated cap) it is only 88uF.
This: https://www.lhup.edu/~dsimanek/museum/DDWFTTW.htm
There is a fascinating BBC-documentary about chemical warfare history and the british Porton Down military research facility, hosted by Michael Mosley [0]. There is a part where the researcher actually makes sarin and…
The headline and article are a bit misleading, the share of completely electric cars (no internal combustion engine) is actually dropping compared to last year as there are some newly introduced tax-reductions and…
You are correct, the link to powertechsystems.eu has those erroneous percentage calculations.
40kg for lead acid equals 13.6kg for lithium so that's 66% lighter.
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…
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...
No sure how these guys (https://www.xethru.com/) are doing financially, but they sell development kits for respiration sensors etc.
Microplastics from car tyres seems to be a big source as well: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5664766/
Protactinium
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…
“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…
Zero Kelvin is still a different league of special scientifically speaking.
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.
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…
Apparently this discussion has been on here before: https://news.ycombinator.com/item?id=11896883
ehh, muddy.ashes.pardon maps to US Holocaust Memorial Museum... (https://www.ushmm.org/) insensitive for sure, is that just a coincidence?
Even if we covered the earth in windmills, we'd still only affect the lowest 100-200m of the atmosphere. And windmills can only extract 50% of the winds energy. I'm thinking a forest full of trees might even reduce the…
Me five. This isn't the first time I've had this happen.
I'm happy with my Yaesu VX-6R, bought it 11 years ago, same day I got my license. Incredibly sturdy and amazing build quality, submersible to 1 meter, die-cast aluminium and O-ring sealed ear-plug/antenna connections.…
If each cell is connected to the bus bars with fuse wire (like in the Tesla battery pack for instance) this connection diagram seems valid. Same way it is connected in the car/powerwall packs that tesla makes at least.
I'm a bit tired of all these CO2 comparisons regarding electric vehicles. If we put the CO2 emissions aside, there are so many other benefits moving to EV's. Especially reduced local pollution in cities such as NOx, VOC…
[0] Estimate about half of the particulate emissions comes from non-combustion sources (brake wear, tire/road wear, dust re-suspension). Interestingly 16-55% of these particle emissions in city-areas comes from brake…
I'm trying https://www.jottacloud.com now, they have an unlimited plan for ~$70/year. Funny story; They previously had a clause in the terms about restricting storage space for users with abnormal usage patterns. A…
Just be sure to read the datasheet carefully. That particular capacitor is only ~120uF at typical 3.3V DC voltage. At 5V DC (which isn't really advisable for a 6.3V rated cap) it is only 88uF.
This: https://www.lhup.edu/~dsimanek/museum/DDWFTTW.htm
There is a fascinating BBC-documentary about chemical warfare history and the british Porton Down military research facility, hosted by Michael Mosley [0]. There is a part where the researcher actually makes sarin and…
The headline and article are a bit misleading, the share of completely electric cars (no internal combustion engine) is actually dropping compared to last year as there are some newly introduced tax-reductions and…
You are correct, the link to powertechsystems.eu has those erroneous percentage calculations.
40kg for lead acid equals 13.6kg for lithium so that's 66% lighter.