fsh

56 ms·

751.
by fsh 5y ago
This is not a random experiment, so statistical methods (Bayesian or other) do not apply. I really wish that this meme of throwing around big words like "Bayesian reasoning" or "Priors" completely out of context will dis
752.
by fsh 5y ago
The essential difference is that you have to put in energy to pump the fluid through the tube. Essentially a vortex tube is simply a very inefficient refrigerator that is fully in agreement with the second law of thermodynamics. With Maxwel
753.
by fsh 5y ago
People love making fun of the bad orbital mechanics in Gravity, but Interstellar is no better. In the beginning they need a Saturn V-size rocket to leave earth orbit. Later they simply decide to leave the laws of physics behind and start zi
754.
by fsh 5y ago
Except that I can easily run a full bitcoin node on my desktop but not an ethereum node. What is the point of having a cryptocurrency if I have to trust someone else to run the software for me?
755.
by fsh 5y ago
Scientist seem to be a lot more worried about B.1.351 than B.1.617. Of course newspapers will always hype up the latest thing that was discovered.
756.
by fsh 5y ago
Sure, but they still draw orders of magnitude more current than an LED bulb with a bad power factor.
757.
by fsh 5y ago
I wonder if the power factor really matters for something as low power as an LED bulb. The grid has to be able to handle the many-kW loads from high-power appliances (ovens, stoves, kettles, car chargers, etc.) anyway. Doubling the current
758.
by fsh 5y ago
Most interpretations of QM make identical predictions for the outcome of any possible experiment. This makes the field fundamentally philosophical rather than scientific.
759.
by fsh 5y ago
No, these fields are all local. Disturbances propagate at the speed of light and an event in one place cannot cause an effect in another place instantaneously.
760.
by fsh 5y ago
It is worth noting that this was claimed in exactly one publication from researchers that are not experts in the field. The publication has meanwhile earned an expression of concern [1] by the publisher that unfortunately does not give much
761.
by fsh 5y ago
The US Navy is not exactly known for great cost efficiency or safety.
762.
by fsh 5y ago
None of this makes any sense. In modern smartphones, the PCBs (i.e. the parts that get hot and contain the sensors and other components) are usually screwed into the frame without any glue. Only the battery, display, and back covers are glu
763.
by fsh 5y ago
Where does this crazy idea come from that you have to glue shut a device to make it waterproof? A rubber gasket and a few screws work just as well without compromising repairability. Wristwatches have been constructed like this for centurie
764.
by fsh 5y ago
This is addressed in the article: Now, there have been debates over the years about whether you’d get a more effective vaccine that way, with a “replication-competent” adenovirus, but generally it’s believed that you can do fine with the “
765.
by fsh 5y ago
Could you give some citations for studies on radiation workers? The permissible doses in most countries are extremely low and there are not that many people working in the industry. This makes me wonder they manage to achieve statistically
766.
by fsh 5y ago
I would guess that the size of the pharmaceutical industry relative to the population is the main factor.
767.
by fsh 6y ago
Solar shingles have been on the market from several companies for many years. They have never really taken off since they are a lot more expensive and have worse performance than regular solar panels.
768.
by fsh 6y ago
The PE connection is exclusively for grounding exposed metal parts and is not allowed to carry any current during normal operation. Using it to discarge capacitors would probably trip the RCD circuit in a modern installation. What you real
769.
by fsh 6y ago
Current quantum computers are way to small and noisy for any practical applications. To give an example, the largest number ever factored using Shor's algorithm on a quantum computer (without cheating) is 15. These cloud services might
770.
by fsh 6y ago
Could you cite where exactly the cable warns about this possibility? I could not find such a statement in the text.
771.
by fsh 6y ago
This is already the case on earth. UTC is defined at sea level and clocks run faster at higher elevations due to the lower gravitational redshift. This effect is easily observable with atomic clocks and has to be taken into account in any a
772.
by fsh 6y ago
I don't buy the argument in the article. The purpose of a battery is to store energy to be used later and potentially elsewhere. There is no way to regain the energy that was turned into heat while mining bitcoins, so bitcoin is not a
773.
by fsh 6y ago
The gravitational force would indeed be zero and a pendulum clock would not work. But the gravitational redshift between to locations is given by the potential difference, not by the local force. The potential difference between the surface
774.
by fsh 6y ago
A pendulum is a mechanical oscillator in which gravity provides the restoring force. For small oscillation amplitudes, the oscillation frequency of a pendulum of length l is 1/(2 pi) sqrt(g/l), where g is the gravitational acceler
775.
by fsh 6y ago
This is because Shortt clocks are pendulum clocks whose oscillation period directly depends on the gravitational acceleration. Quarz oscillators and atomic clocks are not affected by this.
776.
by fsh 6y ago
Gravitational force can be measured very accurately by dropping a retroreflector in a vacuum chamber and measuring the acceleration with a laser interferometer. The clock comparisons explained in the article measure the difference in gravit
777.
by fsh 6y ago
The stadium seems to be about 160 m from the closest part of JILA. Assuming that 100000 people arrive in a 2000 kg car each, the gravitational redshift would be around 1E-21. This is about 1000 smaller than the stability of the best JILA op
778.
by fsh 6y ago
GNSS and clock comparisons measure slightly different things and are complementary. GNSS gives the position of the receiver in space relative to some defined coordinate system. This allows accurate mapping of the earth's surface and me
779.
by fsh 6y ago
For example it could just read all the passwords from the password manager's UI.
780.
by fsh 6y ago
Fleischmann and Pons had a lab sponsored by IMRA (the research division of Toyota) where they were supposed to repeat their experiment. They spent 12 million dollars without getting any believable results. The idea that their research was s

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