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    If multiple universes exist, would they have the same physical laws ours does?

    Obviously, the true answer is that I have no idea, but if by multiple universes you are referring to the many-worlds interpretation of Quantum Mechanics, it might depend on which Universe you are referring to. In the many-worlds interpretation, all possible events do indeed occur, but in...
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    How do rechargeable batteries recharge?

    Most of the electrochemical reactions used in batteries are reversible. However, some require very precise charging conditions (voltage and current regulation) to avoid excessive formation of heat and hydrogen gas, a potentially explosive combination. Battery design (size, layout...
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    Notebooks recommendations?

    I'm in the market for a new notebook, but I really prefer Pointstick devices (Trackpoint, TouchStyk, etc...) to Touchpads. Does anyone have a list of models with Pointsticks or dual input devices (both Pointstick and Touchpad)? A few that I know of include: HP - nc8430, nx9420, nc6400...
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    Economic Myth -- Arizona, Texas, Georgia booming and packed full of good jobs?

    I moved to Texas last year after 8 years in Arizona. I know nothing about Georgia, but as for Texas and Arizona, I'd say your friends' assessment about the states of these economies are pretty true. Both places are booming like crazy. What I'm not so sure about are the availability of good...
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    Highly Technical books

    As for advanced mathematics, you need to understand that in many ways mathematics is really about abstraction and short cuts. For instance, when learning to add, you probably first learned 2+2 = 4 by lifting two fingers on one hand and two fingers on the other and counting the total number of...
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    Highly Technical books

    Like f95toli, I agree that it is good for you to read these books to get some of the general ideas. The problem is that because the results of QM are strongly linked to the mathematics rather than intuition, with these books you will only learn about the "what" (the conclusions of QM), but not...
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    Highly Technical books

    Feynmann's "Lectures on Physics" are pretty good too. These were basically compiled from class notes for a college physics course at Caltech, designed to give freshmen (ie. beginners) a taste of advanced physics. Since they are designed for freshmen, they do not delve too deeply into the math...
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    Is radioactive decay truly random?

    > The very first line of the OP's post is wrong. Technically, you are right, but assuming the poster meant atoms of the same isotope in their ground state (which is usually implied in such a statement), he is basically correct about their being indistinguishable. > QM, for example, is a...
  9. C

    Americans... you all confuse me.

    Fine, why don't you give us a list of significant accomplishments by Mr. Clinton that were not a direct result of his having to compromise with a Republican-dominated congress?
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    Americans... you all confuse me.

    To the OP: Yeah, your friend from Oklahoma needs to get an education. Clinton was a potential disaster, but not because of Monica. Rather, because of things like an ill-conceived (at the time) National health-care plan, plans to increase taxes and expand government spending for social...
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    Who makes the best BBQ?

    I recently moved to Austin, TX and there's some decent BBQ around here, but there's nothing like a good Argentine Asado. Ranged cattle, not corn-fed, killed the day you bought the meat. Lightly seasoned with salt and perhaps a little garlic... Cooked over a well controlled flame. Pure...
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    High K gate metal candidates

    AFAIK, electrically FUSI gates show a lot of promise. For example IMEC has shown some really promising data for both nmos and pmos on a few devices. However, there is a major problem in terms of manufacturability. FUSI gates are formed by depositing a layer of polysilicon and then of nickel...
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    Is radioactive decay truly random?

    But, the theory implies that such ignorance or randomness may be an integral part of nature (not just a consequence of our ignorance or the incompleteness of a theory).
  14. C

    Reaction Kinetics

    Kinetic data can be pretty hard to find in the literature. Also, you need to be careful that any published data matches the conditions you are interested in. I'd start out checking at NIST, although most of their data are for gas-phase reactions: NIST (http://www.nist.gov/srd/chemkin.htm)...
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    Is radioactive decay truly random?

    Agreed!:D
  16. C

    High K gate metal candidates

    Each of the mentioned metals have relatively high work functions, which is why they are used. The problem is they are not terribly stable and tend to react with the HfO2 and the underlying silicon during subsequent high temperature (eg. 1000C) anneals for dopant diffusion/activation. These...
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    Is radioactive decay truly random?

    The distinction that I'm really trying to make is that there are two types of randomness encountered in nature. The first, which I will call pseudo-randomness, arises due to our ignorance about the exact initial state of the system (eg. the positions and momenta of all particles in the system)...
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    Is radioactive decay truly random?

    In the case of a simulation of Brownian motion, my understanding is that you are treating the interaction between the solvent (small molecules) and the target substance (usually a large molecule or particle) in some average way to make the problem computationally tractable. In other words, you...
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    Is radioactive decay truly random?

    The "randomness" of diffusion processes, seems to stem more for the complex interaction of a large number of particles that is too difficult for us to track and uncertainty of initial conditions, than from something inherently random in the process. In other words, deterministic models using...
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    Is radioactive decay truly random?

    Randomness, or at least uncertainty, is a fundamental tenet of quantum theory, which is the best model of the Universe that we have at this time. So far, any and all attempts to discover such "hidden variables" as you describe have failed. Does that mean, they do not exist? Well, we can't be...
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    First fully end-to-end quantum computer is a reality UPDATED

    Isn't next-nearest neighbor interaction enough? It's been a few years since I've studied quantum computers, but as I recall, there are techniques (at least for some systems) by which the next-nearest neighbor interaction can be used to couple in additional qubits. In other words, couple A to B...
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    High K gate metal candidates

    @verndewd - Regarding PolySi/HfO2 The issue isn't that PolySi can't bond to HfO2, but that the highly-reducing silane ambient used to deposit PolySi causes reduction of the HfO2 surface, leading to the formation of Hf silicide (or at least Hf-Si bonding). These Hf-Si bonds result in...
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    Socket 775 board that supports 2 x16 PCI-E cards??

    Currently, 975x supports 8x/8x, while P965 supports 16x/4x. I think RD600 supports 8x/8x. So, the only true 16x/16x support is in the nF 680i boards. As for performance, 16x/16x > 8x/8x > 16x/4x. However, the differences appear to be small for current generation graphics cards and are...
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    Mobo for a Core 2 Duo Vista Build

    You'll be hard pressed to find everything you want for <$130. Especially, the 1394 is hard to find on a sub-$130 board. Your best bet is probably to spend a little more (still <$150) for either the ASUS P5B-E or P5N-E. Both are good overclockers and highly upgradeable. The choice really...
  25. C

    Working Model of the Universe

    An "accurate" model of the hydrogen atom including both electronic and nuclear properties probably wouldn't be that hard to develop and possibly already exists. The problem is that such a model is not terribly useful, except as a pedagogical exercise. For most applications, the coupling...
  26. C

    Is a Power State Other Than 0 and 1 Possible?

    Another variant of the bit is the qubit, which occurs in quantum computing. A qubit can be placed in an indeterminate state (essentially taking on both 0 and 1 values simultaneously). Reading the value of the qubit, simply causes it to revert randomly to one of the two possible states, which...
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    Working Model of the Universe

    Define accurate? Very accurate models of the electronic properties of the hydrogen atom are available. Significantly less accurate, but still quite useful models of the electronic behavior of all atoms are available in the various Quantum Chemistry software packages (eg. Gaussian, GAMESS...
  28. C

    Water well below freezing point.

    TheYak - Actually, you are the one who has it backwards. Water freezes/melts at lower temperatures while under pressure. This is one reason why ice skating works, since the pressure under the skate causes a small amount of the ice to melt, creating a very slick surface. Note that water is...
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    In a normal fireplace with normal wood, on average what temperature would a plate be under the burning wood?

    For an upper limit, you can use the adiabatic flame temperature. This is a theoretical number calculated by assuming that all of the heat produced by combustion goes into heating just the combustion products (the gases released upon combustion) with no losses. Essentially, this is the highest...
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    P965, 975X, or 650i I Can't Seem to Choose

    Help me out here guys. I'm just not seeing the advantages of the 975x over P965. Is it maturity and stability? In that case, I see your point, although with the latest BIOS releases, most of the bugs appear to be worked out for the P965. Is there something else I'm missing? Performance at...
  31. C

    The Unofficial ASUS P5N-E SLI 650i Board Thread

    I'd bet 412.5 is an Asus BIOS limitation, not an Nvidia limit. Think about it, the 680i has plenty of high-end features to distinguish it from the 650i (Eg. 2x16PCIe+1x8PCIe vs. 1x16 or 2x8PCIe, dual gigabit ethernet vs. single, advanced networking features, etc...). Nvidia has no need to...
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