dhdc

6 ms·

1.
by dhdc 4y ago
Un-paywalled: http://archive.today/geASm
2.
by dhdc 4y ago
The joke is that the Nobel prize in chemistry is often awarded to non-chemists.
3.
by dhdc 4y ago
All first five titles in the Touhou series can only run on PC98. The sixth title is the first one to run on windows. There was also a large amount of revamp of the settings, backgrounds and characters. The first 5 titles have settings so di
4.
by dhdc 4y ago
Kuramoto-Sivashinsky is another fun equation with biharmonic operator.
5.
by dhdc 4y ago
Turbulence is unsolved because Navier-Stokes is unsolved.
6.
by dhdc 4y ago
Can you not tell it's sarcasm?
7.
by dhdc 4y ago
> In 20 years Matlab will be as legacy as Fortran is now Not if MathWorks keep offering discounts to universities for putting MATLAB in the courses, gotta get those undergrads "hooked" early before graduating.
8.
by dhdc 4y ago
Which of course is brought to you by Stephen Wolfram, president, CEO and founder of Wolfram Research Inc., designer of Wolfram Language™ which is available in Wolfram Mathematica™.
9.
by dhdc 4y ago
Counter example: MATLAB. Proprietory software, proprietory language, yet it remains unrivalled in control engineering, DSP, communication systems and so on. I genuinely hope that Octave can take off and trade blows with MATLAB face to face,
10.
by dhdc 4y ago
In a sense, Kolmolgorov complexity and Shannon entropy can basically be considered as equivalent concepts: they both define the minimum amount of information required to fully define a given piece of data.
11.
by dhdc 4y ago
The theorem you are looking for is Shannon's Source Coding Theorem[1]. It basically states that no encoding scheme can losslessly compress data beyond the given data's Shannon entropy. [1]: https://en.m.wikipedia.org&#x
12.
by dhdc 4y ago
I'm afraid there really isn't any hobbiest simulators out there. A lot of these arrangements rely on the intrinsic characteristics and geometry of the MOSFETs used.
13.
by dhdc 4y ago
The ZVA is an vector network analyzer, not an oscilloscope. Don't get me wrong, the ZVA is still an extremely impressive piece of engineering, but not even close to what Keysight had achieved with the UXR.
14.
by dhdc 4y ago
> With any three things, you have harmony to humans. In math, specifically dynamical systems, a lot of interesting stuff starts appearing after some variable goes up from 2 to 3, such as Period 3 Implies Chaos [1] for discrete maps, and
15.
by dhdc 4y ago
I fully agree with what you said about AC/DC, just want to point out that DC benefits superconductors as well since superconductors have critical current densities where they lose their super conductivity.
16.
by dhdc 4y ago
> But then there is the tradeoff of the popularity and availability of 12VDC devices due to RV/Boating. Which is exactly why we need to get away from those 12V old garbages asap. 12V is so bloody wasteful, in terms of both wasted po
17.
by dhdc 4y ago
Since we are doing DC-DC, I'd say we go with the highest DCV we can get away with. 12V is just simply too low and the associated I^2R losses will be unacceptable.
18.
by dhdc 4y ago
> Not to mention that circuit breakers are harder in DC. [Citation needed]
19.
by dhdc 4y ago
> DC-AC-DC "sandwiches" Couldn't have said it better, I had a good laugh.
20.
by dhdc 4y ago
To transfer an equivalent amount of power to a given load, AC has a peak to peak voltage of about 170V compared to DC's constant 120V.
21.
by dhdc 4y ago
> If wikipedia is to be believed, DC is better in terms of conductor material costs and transmission losses than AC, at least for long distance high-power high-voltage transmission lines. This is correct. DC is a much better choice for l
22.
Looking Under the Hood of the Generalized Stokes Theorem(galileo-unbound.blog)
1 points by dhdc 4y ago|0 comments
23.
by dhdc 4y ago
Ignoring impedance and assuming the microwave oven is rated at 1kW. 1kilowatt = 60dBm. A typical WiFi receivers works fine at -60dBm = 1 nanowatt. 60-(-60)=120dB, or 12 orders of magnitude. To put that into persepective, a WiFi receiver wor
24.
by dhdc 4y ago
Oscilloscopes often pick up some small voltage at 60Hz when the probe isn't connected to anything, and that voltage increases when a human touches the probe by acting as an antenna. But this is because of the scope's high input i
25.
by dhdc 4y ago
Its typical.
26.
by dhdc 4y ago
How does a student living on their own has to do with anything about microwaves having "lethal potentials"? And what does the high-voltage capacitor has to do with sheet metals? I'm sorry, but I really cannot follow your logi
27.
by dhdc 4y ago
The point of a microwave to have a faraday cage is not for preventing interference with wifi; the cage is there for preventing the microwave microwaving the user. At an average power of 1000W, even a thousand-fold attenuation (-30dB) means
28.
by dhdc 4y ago
As long as the hole size in the faraday cage is much smaller than the wavelength, it will work. The front mesh of a microwave typically has openings on the order of millimeters, which is still good enough for 5GHz.
29.
by dhdc 4y ago
A "high" from a random RF meter doesn't mean anything. Give me numbers in dBm/MHz.
30.
by dhdc 4y ago
A faraday cage does not require grounding to work, but its still recommanded to properly ground microwaves. Also, unless your electrician had a catastrophic fuck up, the metal cage will never be at live voltage, with or without grounding.

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