Scale Definition and 743 Threads

The Southern California Linux Expo (SCALE) is an annual Linux, open source and free software conference held in Los Angeles, California, since 2002. Despite having Linux in its name, SCALE covers all open source operating systems and software. It is a volunteer-run event.
The event features an expo floor with both commercial and non-profit exhibitors, as well as 4 days of seminars on the topic of Linux and Open Source software. Sessions and presentations cover a broad spectrum of topics and technical levels.
SCALE grew out of a series of LUGFests put on by the Simi Conejo Linux Users Group in the late 90s. There were four of them, held every 6 months at the Nortel development facility in Simi Valley, California. They ended when Nortel closed that facility in 2001. Subsequently, members from SCLUG, USCLUG and UCLALUG organized to create a more regional event, which they named the Southern California Linux Expo.
Companies, organizations and projects represented at SCALE include Linux-based projects such as Debian, Gentoo Linux, the Fedora Project, KDE and GNOME, other open-source operating systems including NetBSD and FreeBSD, software projects such as Django, open-source database systems such as MySQL and PostgreSQL, other open-source applications such as Drupal, Inkscape, MythTV and The Document Foundation, activist organizations such as Software Freedom Law Center and the Electronic Frontier Foundation, major technology companies such as IBM, HP and Sharp, web companies including Google, Facebook and eHarmony, and internet projects including OpenStreetMap.

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  1. jbrussell93

    Length contraction on quantum scale?

    How can relativistic length contraction be measured at the quantum scale? Since a Planck length by definition cannot be divided, how can something that is 1 Planck length, traveling near the speed of light, contract with respect to an observer? In other words, how can an observer possibly...
  2. A

    Is My Peer Review Taking Longer Than Usual?

    I sent a paper in for peer review to the journal "General Relativity and Gravitation" 30/10 2011. On 12/11 2011 they sent it out for peer review. Then 5/12 2011 they sent it out for peer review again, obviously one of the referees could not make up his mind or something so they sent it to a...
  3. D

    Why do MOSFETs scale better than BJTs?

    I've read in several places that MOSFETs scale, while BJTs and JFETs do not. I'm curious how a MOSFET scales better, and what is meant by "better", as in do they lose frequency response, power capability, etc. more so than MOSFETs when scaled? Obviously to me a clue is that both a BJT and...
  4. E

    Current value of the scale factor(R₀)?

    What is the current value of the scale factor(R₀)? a= R(t)/R₀ Give me the number.
  5. S

    Unraveling the Mysteries of Planck Scale Physics and Quantum Gravity

    Quantum Gravity only becomes a problem when we probe below the Planck scale. This is because we don't know what occurs inside a singularity in a Black Hole or in the initial condition of the Big Bang when the universe was supposed to be in Planck density. The Planck scale is also the origin of...
  6. C

    How Does Moving a Boat Affect Scale Readings and Torque?

    Homework Statement A trailer carrying a boat is supported by a scale which initially reads 48kg. The boat is moved 0.15m further back on the trailer. The scale now reads 37kg. What is the mass of the boat? Homework Equations torque = F(perpendicular) * d For...
  7. R

    Multimeter Ohms exponential scale; formula?

    Homework Statement Hi, I'm asking the usual "what formula gives me these results" question, but with a twist; I'm attempting to make a "virtual" analogue multimeter that replicates a physical piece of equipment, for training purposes. The idea is that a random MegaOhm value will be generated...
  8. S

    Help Needed: Calculating Universe Temperature at Star System Scale

    Hi I am new to this site and I really need help I missed this class and of course my book doesn't have this formula so if anyone could tell me it that would be great. The temperature of the universe is now 2.725 K, and its scale size is 100 Mly. How hot was the universe when its length...
  9. K

    Why Planck Scale? Reasons & String Theory

    What are the reasons for scientists believing the Planck scale is the smallest unit of length? I have been hearing a lot of this length scale recently and i know we can't even do expiremental research at these small of levels. I'm wondering where they got the idea that strings [from string...
  10. R

    Deriving a scale factor expression for FLRW model

    Hello, I am reading this paper about quantum gravity, trying and failing to follow along in the derivation of this, eq (204) p. 72, expression for the scale factor: a(t) = a_1 \left( 1 + \frac 3 2 ( 1 + \omega ) H_1 (t - t_1) \right)^{\frac 2 {3(1+\omega)}} (I'm not sure what the...
  11. M

    How Does the Kardashev Scale Classify Civilizations?

    I wasn't sure where to put this post, but I'm interested in the Kardashev Scale and what the different Types of Civilization are in relation to us. I'm only somewhat familiar with Types 1-3 but am interested if it can go higher than that and how it can be described.
  12. I

    Scale Reading of Normal Force: Due by Midnight

    Remember that a scale records the value of the normal force, not a person’s actual weight. Draw a FBD. Rotate your coordinate system. A 61 kg student weighs himself by standing on a scale mounted on a skateboard that is rolling down an incline, as shown. Assume there is no friction so...
  13. T

    Calculate the height of a building using scale measurements

    Homework Statement Supposedly, I put an object on a scale inside the elevator of a building, the scale reads m1. I start the elevator to the top of the building, during acceleration, the scale reads m2. As the elevator normalized, the scale reads m1. During the deceleration at the top, the...
  14. J

    Universe expansion + light speed limit -> scale factor linear in time?

    The Hubble parameter is defined by: H(t) = a'(t) / a(t) where a is the scale factor which is a function of cosmological time t. This definition is equivalent to the Hubble relation: v(t) = H(t) r(t) where v(t) and r(t) are the proper velocity and distance of an object at...
  15. bohm2

    Wave-particle duality at Macro scale?

    No-one is suggesting that this is exactly the same as the wave-particle duality that exists at the quantum scale (e.g. non-locality) but I thought these papers looking at the behaviour of “walking droplets” that can be seen at the macroscale were very interesting: Quantum mechanics writ...
  16. A

    What is reflection and refraction of light at the microscopic scale?

    I'm not asking for what reflection and refraction are or the usual law governing it, but I would like to understand what they represent at the quantum atomic, molecular level? In a mirror is it about photons absorbed and emitted with the same wavelength and same direction through atomic electron...
  17. miraiw

    Change of coordinates resulting in scale

    Homework Statement Consider q: ℝ^{2}→ℝ q(x,y) = \left[x\ y\right] S \left[\stackrel{x}{y}\right] Show that with the change of coordinates \left[\stackrel{x}{y}\right] = Q\left[\stackrel{x'}{y'}\right] that q(x,y) =\lambda_{1}x'^{2} + \lambda_{2}y'^{2} Homework Equations S =...
  18. G

    Aspiring to build working scale models

    I will be entering university in an aerospace engineering program next year but I want to get a head start on it right now. What I mean by that is start building basic rockets and planes, or even more basic than that, I don't know. Why I am here is to ask for guidance on where to start. I...
  19. T

    What Is the Explanation for Quantum Mechanics at the Quantum Scale?

    Hello everyone, thanks for reading. We all know that Quantum mechanics can be "ignored" when working with systems in which the typical distances and energies are big enough (compared to h, or other quantum constants). However, when I try to think of an explanation for it I'm not sure I hit...
  20. B

    Should I Scale My Boundary Condition Values for Problem Where I Scaled Interior?

    Hello all: I would very much appreciate advice on setting up a problem. Apologies in advance... This is probably a silly question--I'm more of a chemist than an engineer/math person! I have written a code for calculating changes in concentration/mass within a domain over time, as new...
  21. B

    How to Calculate Net Force on Elevator Moving Downward with Upward Acceleration?

    Homework Statement A weighs 600 N on an elevator when it is stationary. Each elevator accelerates according to the specified arrow that is drawn next to it. In all cases where the elevator is moving, it is moving downward. Find net force, if the elevator is accelerating 2.0 m/s/s upward, even...
  22. C

    "Scale in Elevator: Should Student Worry?

    Homework Statement A person stands on an scale in an elevator. If the scale reads zero, should the student worry? Explain. Homework Equations The Attempt at a Solution I think the student would be in free fall and he should worry. The only force acting on the elevator would...
  23. J

    Theoretical Particles @ Planck Scale: Is there a maximum wavelength of light?

    First time poster so please be gentle... E = h * f f = c / wavelength 1) Is there a theoretical limit on maximum f (minimum wavelength of Planck length)? 2) Is there a theoretical limit on minimum f of 1 (maximum wavelength of c)? (ie// the maximum distance that a photon can cover in...
  24. D

    Understanding the Scale 1:10 of a Circular Model Railway Track

    Because I cannot draw a picture in this problem, I will do my best to describe it in words. This problem is about a circular railway track. The diagram that goes with it shows one of the 15 curved pieces. Its width is MEASURED 1 cm and its arc length of the inner edge is MEASURED 30 cm...
  25. G

    Time scale for the rapid transient

    Homework Statement Time scale for the rapid transient (overdamped bead on a rotating hoop). The governing equation m*r*φ'' = -b*φ' - m*g*sinφ + m*r*(ω^2)*sinφ*cosφ, can be reduced to ε(d^2φ/dτ^2) + dφ/dτ = f(φ). Using phase plane analysis it can be shown that the equation ε(d^2φ/dτ^2)...
  26. K

    How do measure and know about the vast scale of the Universe?

    To start, I'm not at all knowledgeable in physics; completely ignorant. Now, I know I could go ahead and research this on my own, but I've always felt like asking an actual interactive human being is the best way to gain direction compared to a lifeless search engine or book. So how do we know...
  27. C

    Large Scale Uncertainty Principle

    Hi, I was watching Through the Wormhole two weeks ago (I think it was a re-run), and they were talking about the uncertainty principle, and how it was impossible to prove due to the change in momentum of a particle when hit with an observation device, such as light. I think the guy was using...
  28. R

    PH Scale: Understanding Its Mechanism

    What is the mechanism of pH scale?
  29. P

    Need very fast answer please. very easy if you know how to read a vernier scale.

    i know how to read these scales, but this problem was really hard to see for me. can you guys see if it lines up at .44mm or .46 mm? I attached drawing
  30. P

    Scale invariance and bubble universes

    Max Tegmark has provided a four part taxonomy of multiverse theories (http://arxiv.org/abs/astro-ph/0302131). The first type can be labeled the "bubble universe" multiverse, in which universes like ours are scattered throughout an infinite space in every direction. Going the other direction...
  31. S

    The kelvin scale - how could it have been defined?

    Hey, I know that the kelvin scale uses the absolute zero as its null point. If so, I wonder why the scale needs to be defined using the triple point of water. I mean, the absolute zero serves the purpose of defining the kelvin scale already, doesn't it?
  32. ArcanaNoir

    What is the impact of other forces on measuring gravity on a very small scale?

    Hi.. umm, I'm from the math department, and um...I'm shy... hello physics people... So I saw this thing on tv, I think it was Through the Wormhole..I'm not sure..and um, don't judge me for watching "science for the uneducated masses"... But anyway, they were talking about gravity, and...
  33. K

    Perhaps we do see quantum behavior at the macroscopic scale

    Okay, I will preface this by saying that I have no formal education in physics. I am just a regular man with an active mind and healthy dose of curiosity. There may be some errors in my terminology, but hopefully you'll get what I am saying. Heck, maybe this is already a well known hypothesis...
  34. Z

    The Scale Factor & Universe Entropy: Examining Heat Death

    Empirical evidence supports that the scale factor is proportional to the following. a(t) = e^(HT) Where the distance between any two objects are D(t) = a(t)Δx Where x does not measure physical distance, but a conventional coordinate distance. This means that eventually any physical distance...
  35. T

    Astronomy - Distance with different scale factors

    Homework Statement Expansion of the universe is described by the scale factor R(t), where t is the time after the Big Bang. For a flat universe the scale factor is today R(t)=C_{1}\cdot t^{\frac{2}{3}} When the Universe was radiation dominated, for t <200,000 years, the scale factor was...
  36. N

    Mathematica Multi scale analysis using mathematica

    I am doing multi scale analysis while solving a particular nonlinear PDE. I am trying to check a solution I have for a particular set of boundary conditions and governing equation, to a given order. Is there a simple way to sort scales on Mathematica? For example, if our small parameter is...
  37. D

    Is body to body gravity scale independent?

    I'm working on a gravity simulator and I can't help but feel that I've done something wrong. Extremely large bodies take a longer time to fall into each other than smaller ones. Is this right? Like for example, if you had to bodies of solar mass at 1 AU apart, would it take a longer, shorter or...
  38. S

    Can the magnetive field of a pedometer be cancelled at a very small scale

    Homework Statement Okay , i am trying to know if a compass will work alongside a pedometer , under a very weak battery. What i mean by this is that will there be a large scale interference if the compass is placed next to it. I am trying to do such since, according to my schoolwork have to...
  39. N

    A cylinder full of water on a scale

    if we have cylinder full of water on a scale the we heat it, does the scale show any difference in weight of cylinder? water don't evaporate.
  40. A

    The origin of degree scale in angles

    A student showed me a problem, this week, it was: What is the number of regular polygons whose intern angle is an integer number? I used the equation i=180 (n-2)/n, where i is the internal angle of the polygon and n is the number of the sides of the polygon. After some trials, i got to the...
  41. A

    Mathematica How to make my own color scale (ColorData) on Mathematica

    Dear All, I started to use Mathematica to make some plots I usually did with gnuplot. I know it has some great color schemes, but I would like to be able to use the same I was using in gnuplot. The question is: how could I create a color scheme? In gnuplot I just used the following command set...
  42. N

    Confused about entropy trumping evolution on universal scale

    As the title says, I am confused - very confused. I know that the 2nd law of thermo means that the universe is increasingly disordered on a universal scale, even though there has been an apparent increase in order since the "Big Bang." Does that mean entropy isn't exactly synonymous with a...
  43. A

    Does This Cosmological Model Re-Collapse?

    Hello. I have been working through some questions and answers to do with cosmology. One of them asks you to consider a model where: \Omega_{MO}=3 \Omega_{\Lambda O}=0.01 \Omega_{RO}=0 and asks you to show mathematically that the model re-collapses. Following through the math, I get three...
  44. J

    Solving Balance Scale Math: X vs Y Weight Difference

    I was trying to figure out the following - assume you have an old fashioned balance scale, with two pans hanging from a lever with a fulcrum in the middle of the lever. On one side you have a weight of X, and on the other side you have a weight Y. If Y is big enough, that side of the scale...
  45. W

    Musical scale in magnetic field vibrations theory101

    hi this is word21. I have a question to anyone who can help in any way.is there a mathmatic form. that is best to use to asign integrals to musical scales as in a=x number
  46. M

    Why are quantum fluctuations amplified when viewed on a smaller scale?

    Why are quantum fluctuations amplified when viewed on a smaller scale? I read about this in 'elegant universe' but the book never answered my question.
  47. E

    What is Discrete Scale Relativity?

    I recently heard of this theory: Discrete Scale Relativity which can be found here: http://www.science20.com/discrete_scale_relativity/blog/discrete_scale_relativity-78208 and http://www3.amherst.edu/~rloldershaw/ What are the issues with this theory and why has it not picked up more...
  48. B

    On a scale of 1-100 how bad is my graphics card?

    1 being the worst you can buy right now, 100 the best you can buy right now i got a mobile intel R 4 series express chipset family with a booster: nvidia geforce G210M cuda 512Mb i think that's right. >.> could be wrong though :s the dxdiag window thing just says the mobile intel r 4 stuff but...
  49. K

    Impact of quantum effects on macro scale objects

    Not long ago I was arguing with someone on the Internet (where everyone is wrong) about impact of quantum effects on macro scale objects. Imagine ice-hockey table (one with almost no friction) with number of pucks on it. If you'll hit one of them it is safe to say that pucks' paths are very...
  50. C

    How to change scale for fringe levels at ls prepost

    hi all.. i facing problem to get a good contour..because the scale at fringe levels so big. for example: level 8 = 1.224e+037 level 9 = 6.122e+036 level 10 = 0 i have 4500 element that the value from 0 to 6.122e+37..so the result that i got all in blue color because have a big difference...
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