quarterwave

14 ms·

61.
by quarterwave 12y ago
Very good question. Here's the gist of it, a rough way of thinking about it. A time varying electromagnetic field is produced by moving charges (except for a minor distinction about steady currents). The direction of motion of the char
62.
by quarterwave 12y ago
The probabilities discussed in this paper seem to have an L1 flavour (Manhattan distance) while those in quantum mechanics come from L2 functions (Pythagorean distance).
63.
by quarterwave 12y ago
Interesting stuff, reminds me of the analog circuit optimizer a few weeks back. Compared with (say) the evolution of a flying squirrel, are there aspects to this method that might be called 'genetic'? Also, is the design method ex
64.
by quarterwave 12y ago
Good point. It comes down to how well the analog cancellation will attenuate the in-band blocker (cf. IIP3 spec of the RF LNA).
65.
by quarterwave 12y ago
After my family started buying dresses online (average $20 per item), I started paying more attention. Online shopping in India not only provides a vast range across vendors, it also saves the cost and hassle of travelling to a big store -
66.
by quarterwave 12y ago
The analogy with license plate detection appears quite accurate. At first glance this scheme appeared akin to gathering wifi MAC address broadcasts, but the picture of the box shown in the article has a Tx antenna co-ax connector (looks lik
67.
by quarterwave 12y ago
A bandgap circuit subtracts log(A.x) and log(B.x) to get a ratio log(A/B) that is independent of x (x>0), and to achieve this topology by evolution is a striking result. The question is whether one would trust the resultant topology
68.
by quarterwave 12y ago
In II-1-5 [1] we learn that magnetism is a relativistic effect whose strength is v^2/c^2. This ratio is a very small number for the electron drift velocities associated with typical currents in copper wires, yet we perceive magnetic fo
69.
by quarterwave 12y ago
Looks like multi-core asynchronous with load balancer wins even in the laser world.
70.
by quarterwave 12y ago
'Enigma' the novel by Robert Harris on which that movie was based, is superb though. Definitely makes 1943 seem like 1943. Another book worth reading is David Kahn's historical account 'Seizing the Enigma.'
71.
by quarterwave 12y ago
Growing up in the early 70's (1970's, that is) I got a small book as birthday present: 'Let's go to the moon'. It was about a bunch of racoons that build a lunar rocket, and a sly fox named Reynard up to no good. Wo
72.
by quarterwave 12y ago
You know my methods Watson, what can you deduce? Well, Holmes, from the range, it appears to be a point-to-point radio rather than an ad-hoc network. The length (6 inches) favours the 40MHz ISM band, with a low-gain integrated antenna &
73.
by quarterwave 12y ago
How quickly does a model's accuracy and precision improve with increasing sample size? Indeed, there are counter examples (like the periodogram estimator for psd) where variance does not decrease with window length. We often don't
74.
by quarterwave 12y ago
The 2008 crisis showed that systemic risk in the repackaging business far outweighs the fine print in retail investment products. If people are upset it's not due to their ignorance but because of the feigned ignorance of those exp
75.
by quarterwave 12y ago
I was curious how feathers -> flight evolved, came across this article: http://dinosaurs.about.com/od/thedinobirdconnection/a/origin...
76.
by quarterwave 12y ago
Reminded me of the discussion about "The 'underlying' unity of nature" in the Feynman Lectures on Physics: http://www.feynmanlectures.caltech.edu/II_12.html#Ch12-S7
77.
by quarterwave 12y ago
“Can you give me a simple, concrete explanation of how quantum computers work?” http://michaelnielsen.org/blog/quantum-computing-for-everyon...
78.
by quarterwave 12y ago
To estimate an answer for the first problem: consider two cylinders with zero volume, the one equatorial (r=R) and the other polar (r=0). Both correspond to zero volume. Hence the maximum volume occurs (hand wave) for a height somewhere bet
79.
by quarterwave 12y ago
This is indeed true. However in quite a few places the practicality of prepaid metal gas cylinders beats installing electric utility lines & meters, ensuring efficient transformers, preventing pilfering/meter tampering, etc.
80.
by quarterwave 12y ago
Several languages use compound nouns, proper and common. These cause pronunciation problems when the phrase is read atomically, instead of by parsing. For example, German armbunduhr is easily understood as arm+bund+uhr = clock around arm, o
81.
by quarterwave 12y ago
The 741 has quite a few current mirrors for bias/gain, so the bias points would be much more sensitive to transistor parameter mismatch than to wiring neatness. Also, discrete PNP transistors tend to be different from the lateral PNP&#
82.
by quarterwave 12y ago
In his autobiography 'Wings of Fire', A.P.J.Abdul Kalam, himself an ISRO rocket scientist & program director who later became a highly popular President of India (he draws crowds to this day, several years after office), quote
83.
by quarterwave 12y ago
The first question to ask may well be "why does my problem need computation on a commodity cluster?". A massive multi-player spaceship battle may be best served by a HPC environment, using C++ and MPI. There's probably only a
84.
by quarterwave 12y ago
Are Erlang-based start-ups more likely to be acquired because Erlang has gained a Jedi Knight reputation for "sorcerer's ways"?
85.
by quarterwave 12y ago
The research paper referenced above indicates a 0.5/sec sampling rate. Would a battery-backed inverter be able to sufficiently attenuate the power signature on this time-scale?
86.
by quarterwave 12y ago
Good point: "I may be more acceptant of sentences with weird grammar."
87.
by quarterwave 12y ago
The Borg from Star Trek TNG?
88.
by quarterwave 12y ago
Interestingly enough, organic LED (OLED) technology uses dyes instead of semiconductor materials. OLED display panels can be 'printed' like ink-jet printers. http://en.wikipedia.org/wiki/OLED
89.
by quarterwave 12y ago
When (if at all) will it be feasible for a bunch of kids in a garage to make a feature-length realistic-cgi movie? Assume computing on the public cloud, movie budget $1M.
90.
by quarterwave 12y ago
Very nice! I assume clicking inside the panel is like throwing a pebble in a pond? Is this correct?

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