Search found 60 matches

by FrancovS
Mon Jul 25, 2011 7:46 pm UTC
Forum: Serious Business
Topic: Is health care a fundemental human right?
Replies: 247
Views: 30328

Re: Is health care a fundemental human right?

I was under the (possibly mistaken) impression that fundamental rights weren't initially thought as, as Le1bn1z put it, "things which are "good" or "nice" to have". Instead, they were limitations to legislation, in order to make it impossible for some group to destroy d...
by FrancovS
Fri Jul 08, 2011 8:36 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0922: "Fight Club"
Replies: 124
Views: 25703

Re: 0922: "Fight Club"

I agreed with the comic, but not with the alt-text. Fight Club is awesome, but what you should like about it is not what it says about society or consumerism. What makes it so great (IMO, one of the best movies ever made) is how Brad Pitt's character rubs you in weird, wrong ways. It really is about...
by FrancovS
Thu Jul 07, 2011 1:27 am UTC
Forum: Science
Topic: Electronic equivalent of a syphon
Replies: 11
Views: 3807

Re: Electronic equivalent of a syphon

I really don't get what you mean by "an effect similar to a Zener diode". If you mean "conduct after a certain threshold", it sounds like a Schmitt trigger using an op-amp would do it.
by FrancovS
Thu Jun 16, 2011 7:31 pm UTC
Forum: Science
Topic: Wait, can free will exist?
Replies: 247
Views: 27221

Re: Wait, can free will exist?

This consciousness or free will may be external to the universe, like an astral body that exists in a more fundamental plane of existence. The catch is that this more fundamental plane of existence is also either deterministic or random. If it's not random, then you could predict how your soul woul...
by FrancovS
Wed Jun 08, 2011 4:42 pm UTC
Forum: Mathematics
Topic: Is there an intuitive appeal for multiplication of integers?
Replies: 22
Views: 3781

Re: Is there an intuitive appeal for multiplication of integ

To ease the introduction, I'd advise you to focus on showing that -(-x) = x. I believe multiplication follows pretty easy from that, as it's pretty much repeating additions. I'd do that by interpreting the outer minus sign as "taking out stuff", and the inner one as "stuff that has in...
by FrancovS
Tue May 31, 2011 8:27 pm UTC
Forum: Religious Wars
Topic: Proper Orientation (of TP)
Replies: 34
Views: 10590

Re: Proper Orientation (of TP)

Well, it's not really about inertia. The idea is to hold the roll in place with your palm/wrist and pull it with your fingers. It's unwieldy to do when the paper is in the over position.
by FrancovS
Wed May 11, 2011 11:37 pm UTC
Forum: Serious Business
Topic: What do you think of this quote about "evil"?
Replies: 75
Views: 35123

Re: What do you think of this quote about "evil"?

For this thread, let's please agree to consider as evil the perpetration of violence against people for reasons other than actual self-defense--in other words, violence against the innocent. That's what you meant, right? In this case, it is pretty clear that one can do evil without claiming to be f...
by FrancovS
Fri Mar 18, 2011 8:50 am UTC
Forum: Mathematics
Topic: The Mathematics of Perspective
Replies: 35
Views: 6186

Re: The Mathematics of Perspective

Just as with computer graphics, the idea with a photograph is that looking at the photograph should look as much as possible like looking at the subject of the photograph. Isn't the only way to achieve this the "screen as a window" model? I mean, I always thought that correct perspective ...
by FrancovS
Mon Feb 14, 2011 10:52 pm UTC
Forum: Science
Topic: Capacitance - Radio Squelch Phenomenon
Replies: 26
Views: 6122

Re: Capacitance - Radio Squelch Phenomenon

Assume the tuning capacitor is between the inductor and the ground. In this case, the charge buildup in the antenna could stop current from flowing through the diode. A resistance in parallel with the tuning capacitor could fix this (and there are designs with that resistance). Now, for some reason ...
by FrancovS
Sun Feb 13, 2011 10:20 pm UTC
Forum: Science
Topic: Capacitance - Radio Squelch Phenomenon
Replies: 26
Views: 6122

Re: Capacitance - Radio Squelch Phenomenon

I always assumed that your hand just discharges static electricity that gathers in the antenna due something only allowing a one-way current flow in the amplifier circuit under certain circumstances... maybe by connecting a resistor to the antenna and to the ground you'd get the same improvement. T...
by FrancovS
Sat Feb 12, 2011 12:28 am UTC
Forum: Science
Topic: Capacitance - Radio Squelch Phenomenon
Replies: 26
Views: 6122

Re: Capacitance - Radio Squelch Phenomenon

I always assumed that your hand just discharges static electricity that gathers in the antenna due something only allowing a one-way current flow in the amplifier circuit under certain circumstances... maybe by connecting a resistor to the antenna and to the ground you'd get the same improvement.
by FrancovS
Wed Jan 12, 2011 5:19 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0841: "Audiophiles"
Replies: 266
Views: 51854

Re: 0841: "Audiophiles"

crazy math. This is not possible analog circuits are capable of doing unbelievably crazy and even impossible math. In the case of signal reconstruction from samples even a simple HW analog lowpass filter does a lot of good job. The resulting signal faithfully corresponds to the original except for ...
by FrancovS
Mon Jan 10, 2011 6:39 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0841: "Audiophiles"
Replies: 266
Views: 51854

Re: 0841: "Audiophiles"

A signal that does not contain frequencies above some limit information between the samples what information is there "between the samples" in a singal which does not contain frequencies above x Hz and is sampled at 2*x Hz ? Information that cannot be retrieved by simply using zero order ...
by FrancovS
Mon Jan 10, 2011 4:37 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0841: "Audiophiles"
Replies: 266
Views: 51854

Re: 0841: "Audiophiles"

(...) So if you correctly sample the signal at a frequency slightly higher than the double of said limit, you'll be able to reproduce the signal perfectly +- a quantization noise dependent on the used bit depth. Wait. Even with oversampling in the recording process, when you try to reproduce a sign...
by FrancovS
Sun Jan 09, 2011 8:24 pm UTC
Forum: Hardware
Topic: YALT (Yet Another Laptop Thread)
Replies: 19
Views: 2076

Re: YALT (Yet Another Laptop Thread)

by build quality, I mean the details making difference. Ah, I get it now. In tech blogs, I usually see "build quality" being, to some extent, related to durability, which is kind of gimmicky: it feels solid, so it will last long. In this case, the UL80 is good, I guess. The charger is not...
by FrancovS
Sun Jan 09, 2011 1:51 am UTC
Forum: Hardware
Topic: YALT (Yet Another Laptop Thread)
Replies: 19
Views: 2076

Re: YALT (Yet Another Laptop Thread)

To be honest, I really don't understand what "build quality" really means. The laptop is glossy and seems plastic-y, but when i handle it it feels quite solid and well built. The only parts that seems vaguely fragile are the part above the keyboard, which flexes a little (but it really see...
by FrancovS
Sat Jan 08, 2011 9:02 am UTC
Forum: Hardware
Topic: YALT (Yet Another Laptop Thread)
Replies: 19
Views: 2076

Re: YALT (Yet Another Laptop Thread)

I bought an Asus UL80 a few time ago. It is a spec beast considering the size, price and the and battery life. What I don't like about it is: -ASUS software. Changing from integrated to discrete is awful because it messes up with the taskbar. That quickbooting linux thing is useless. -The integrated...
by FrancovS
Fri Jan 07, 2011 8:47 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0841: "Audiophiles"
Replies: 266
Views: 51854

Re: 0841: "Audiophiles"

It does not deal only with sine waves. You should give a look at the wikipedia article about Fourier series. Basically, the idea is that you can make a excellent approximation of a square wave, for example, by adding sine waves of different frequencies. After it stops feeling cheaty, give a look at ...
by FrancovS
Fri Jan 07, 2011 5:20 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0841: "Audiophiles"
Replies: 266
Views: 51854

Re: 0841: "Audiophiles"

With a sampling frequency of 100 Hz, for example, a 48Hz signal would be terribly reproduced, even though it could be recovered mathematically from the samples. I would be more credulous, if not for the second part. If you can "recovery mathematically" the original waveform, by definition...
by FrancovS
Fri Jan 07, 2011 1:41 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0841: "Audiophiles"
Replies: 266
Views: 51854

Re: 0841: "Audiophiles"

Nyquist-Shannon theorem is a source of lots of bullshit from EE teachers because it really cannot be applied to real life audio reproduction in the way most people try to. It is about reconstruction of mathematical functions, so you must have all the (infinite) samples before talking about recoveri...
by FrancovS
Tue Jan 04, 2011 6:11 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0841: "Audiophiles"
Replies: 266
Views: 51854

Re: 0841: "Audiophiles"

Nyquist-Shannon theorem is a source of lots of bullshit from EE teachers because it really cannot be applied to real life audio reproduction in the way most people try to. It is about reconstruction of mathematical functions, so you must have all the (infinite) samples before talking about recoverin...
by FrancovS
Mon Dec 27, 2010 7:03 am UTC
Forum: Hardware
Topic: How much use can a processor take?
Replies: 15
Views: 3277

Re: How much use can a processor take?

There is a lifetime, but it is longer than that of the motherboard in most cases. Heat in itself is not a problem. The problem is that the temperature changes, causing expansion and contraction. Wait, wait. So, in theory, I could increase the lifetime of a processor by keeping it hotter than usual ...
by FrancovS
Sat Dec 25, 2010 2:15 am UTC
Forum: Science
Topic: Squirting
Replies: 19
Views: 2930

Re: Squirting

<snip> I will insist on trying to make an analogy to electrical phenomena. If I take my hot cathode and cool it down, I limit the current, which results in a smaller voltage drop across the resistor, and this accounts for the increased energy of each individual electron emitted from the CRT. I have...
by FrancovS
Sun Dec 05, 2010 12:07 am UTC
Forum: Music
Topic: Most Overrated Artists/Songs
Replies: 241
Views: 33474

Re: Most Overrated Artists/Songs

I find it hard to say bands are overrated because I feel like if I feel that way, I simply don't fully understand the context in which it was made, or the music itself. Same with underrated bands too. We just think things at the whims of our prejudice. Well, the point of discussing music is pretty ...
by FrancovS
Wed Nov 24, 2010 12:17 am UTC
Forum: Mathematics
Topic: Fractal-like circle thingy
Replies: 26
Views: 2836

Re: Fractal-like circle thingy

Had a similar doubt once, and It gets a lot more intuitive if you think of the limit from another perspective: it is not the final result, it is the trend of the process. And in this process, the shape is always made of tiny squarey things. However, in the sense of which points are contained in the...
by FrancovS
Tue Nov 23, 2010 4:05 pm UTC
Forum: Mathematics
Topic: Fractal-like circle thingy
Replies: 26
Views: 2836

Re: Fractal-like circle thingy

Had a similar doubt once, and It gets a lot more intuitive if you think of the limit from another perspective: it is not the final result, it is the trend of the process. And in this process, the shape is always made of tiny squarey things. However, in the sense of which points are contained in the ...
by FrancovS
Fri Oct 15, 2010 5:39 am UTC
Forum: Science
Topic: questions about a piece of paper (messing around with elec.)
Replies: 6
Views: 969

Re: questions about a piece of paper (messing around with el

Well, if by "ground" you mean, well, ground, nothing would happen. But if you mean a common referential, you could get some current. 20 volts is too little.
by FrancovS
Fri Oct 08, 2010 3:36 am UTC
Forum: News & Articles
Topic: Hey folks, let's violently slaughter our political opponents
Replies: 25
Views: 3412

Re: Hey folks, let's violently slaughter our political oppon

It was, quite obviously, a parody of the attitude people attribute to the stereotypical wild-eyed enviro-nut. They're using the hyperbole of the example to show they are not actually like that and do, in fact, have a sense of humour. That wasn't the point. At least not the main one: the people who ...
by FrancovS
Thu Sep 23, 2010 3:53 am UTC
Forum: News & Articles
Topic: Intel wants to charge $50 to use your CPU fully
Replies: 99
Views: 9667

Re: Intel wants to charge $50 to use your CPU fully

Keep in mind that perfect competition and innovation are at odds with each other. That pretty much nails it. I'd add a possible corollary: in innovation intensive markets, which are monopolistics by nature, it doesn't make sense to rant against government intervention, since the main reason to avoi...
by FrancovS
Wed Sep 22, 2010 2:20 am UTC
Forum: News & Articles
Topic: Intel wants to charge $50 to use your CPU fully
Replies: 99
Views: 9667

Re: Intel wants to charge $50 to use your CPU fully

Well, to me it's clear that what annoys people is not the possibility of upgrading your machine; it's the fact that Intel is intentionally crippling their products in order to be able to charge a premium for the unharmed one. What annoys me about this (as Zamfir put it) "price discrimination&qu...
by FrancovS
Wed Sep 22, 2010 1:08 am UTC
Forum: Mathematics
Topic: Integral problem
Replies: 10
Views: 2209

Re: Integral problem

I once asked my teacher the exact same question: what is dx, exactly. He couldn't provide me a good answer, but I will tell you the only satisfactory one I found. d[anything] is notation, so you must understand what it is trying to convey. dx in the context of an integration means that you are integ...
by FrancovS
Sat Sep 11, 2010 4:04 am UTC
Forum: Science
Topic: Question on transformers (not from cybertron)
Replies: 9
Views: 1309

Re: Question on transformers (not from cybertron)

Ah, I understand now, so you design it so that whenever the secondary coil has a short circuit the induction in the first coil is big enough to not blow up your circuit. Well, no. I'm not sure that you understand how transformers work. If the secondary is a short, in a situation where the windings ...
by FrancovS
Fri Sep 10, 2010 12:56 am UTC
Forum: Science
Topic: Question on transformers (not from cybertron)
Replies: 9
Views: 1309

Re: Question on transformers (not from cybertron)

The primary acts as a inductor when the secondary is open. So it's inductance must be big enough to only allow a small current. Ideal transformers have infinite inductance; the basic idea is that current will only flow through the primary if the secondary "counters" the flux change, by gen...
by FrancovS
Thu Aug 19, 2010 3:03 pm UTC
Forum: Science
Topic: Reducing the effects of acceleration on the human body
Replies: 123
Views: 17043

Re: Reducing the effects of acceleration on the human body

SlyReaper mentioned using an artificial heart, but how about replacing blood by other fluid? Something more viscous might help spread the forces, and a more homogeneous liquid wouldn't suffer the centrifuge effect.
by FrancovS
Thu Aug 19, 2010 3:31 am UTC
Forum: Mathematics
Topic: Confused by infinity.
Replies: 58
Views: 6191

Re: Confused by infinity.

I will try to explain this in a way which hopefully will be easier for people who are not math-savvy. neoliminal, when you are dealing with countable infinite sets (as the natural numbers, the integers, the even numbers, the primes, the rationals...) you can always make a list, as you did, that pair...
by FrancovS
Wed Aug 18, 2010 1:43 am UTC
Forum: Mathematics
Topic: Is every electric field possible?
Replies: 2
Views: 972

Re: Is every electric field possible?

Well, I kinda mis-explained the problem. I wouldn't even have gone so far: I could simply argue that an constant field Ex = 1 (x component) has zero divergence, so no charge originates it, so it can't exist. My goal with this problem is to know which field patterns can be generated in practice. Sinc...
by FrancovS
Tue Aug 17, 2010 6:32 pm UTC
Forum: Mathematics
Topic: Is every electric field possible?
Replies: 2
Views: 972

Is every electric field possible?

This is a problem about electrostatics I've been trying to solve. I believe it has been solved before, but I couldn't find anything about it. So here we go: I want to know if any vector field with zero curl can be an electric field, in the sense that it can be generated by a charge distribution with...
by FrancovS
Thu Aug 12, 2010 2:02 am UTC
Forum: Mathematics
Topic: You can solve any rubik's cube in 20 moves.
Replies: 27
Views: 5021

Re: You can solve any rubik's cube in 20 moves.

I've just realized that there are 20 deattachable pieces in a rubik's cube. Mere coincidence? Probably :/...
by FrancovS
Wed Aug 11, 2010 6:33 pm UTC
Forum: Mathematics
Topic: a million positive divisors
Replies: 22
Views: 3761

Re: a million positive divisors

Yes, I am aware of that, but I tried to make it easier to grasp. The capital pi scares people.
by FrancovS
Wed Aug 11, 2010 4:02 pm UTC
Forum: Mathematics
Topic: a million positive divisors
Replies: 22
Views: 3761

Re: a million positive divisors

The idea is basically to use combinatorics. If a number has a prime factorization of n distinct primes, it has 2^n divisors because each prime will or will not appear (2 possibilities). You can't do that if the prime factors have been repeated, because different combinations may result in the same n...

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