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. C

    B What you think of Scale Symmetry?

    After 3 hours of google search. I found out scale symmetry is related to dimensional transmutation that can replace the supersymmetric particles that can solve the Hierarchy Problem of the Higgs (this is the hottest thing in LHC and physics right now). Scale symmetry is the key to understand all...
  2. ATY

    How Accurate is the Integral Length Calculation in Turbulence Studies?

    . ##\require{color} \color{white} \colorbox{crimson} {Mod Note: to see images in this post displayed correctly, click on Reply and view this in editor}## Hey guys, I need your help. It is about the integral length of turbulence flow. So we got data from some wind measurement, recorded at...
  3. C

    B How Does Changing Gravity and Speed of Light Affect the Planck Scale?

    If gravity becomes stronger. would the Planck length becomes longer or bigger? Would speed of light c also have the same effect of changing the Planck length size? Would anyone know any java website that can make you adjust the strength of gravity and c and see how big or small the Planck scale...
  4. ReneVeerman

    Freshwater (industrial scale) from seawater, on sunlight

    i have this idea to produce fresh water for farming and all the other uses of fresh water, from seawater, on sunlight, using mostly/only off-the-shelf parts.. i am currently not able to pursue this idea myself due to financial constraints, so i thought i'd float the idea here looking for some...
  5. C

    I Exploring the Behavior of Sin2thw with Respect to Scale

    Hi, everybody! I can not really understand the particular behavior of the sin2thw with respect to the scale (like on the plot below). Clearly there are three regimes from the left to the right: a plato, a degradation and a steep rise. But why exactly does the curve behave like this? The...
  6. F

    I Hubble parameter in terms of the scale factor

    From Introduction to Cosmology by Matt Roos, he wanted to derive the Hubble parameter in terms of the scale factor. From the Friedmann's equation, ##\frac{R'^2 + kc^2}{R^2} = \frac{8πG}{3}ρ## The density parameter is ##~Ω(a) = \frac{8πG}{3H_o^2}ρ(a)~## and let ##~Ω_k = \frac{-kc^2}{H_o^2}##...
  7. GIM

    I QCD scale and massless limit of u & d quarks

    Hello! Could anybody help me? My wondering seems so trivial, but I can't skip it. They say that since u and d quarks are much lighter than QCD scale(~200MeV), in reality we can consider the QCD Lagrangian has an approximate global chiral symmetry with respect to these two flavors. At first, it...
  8. doublee89

    A Normalization and Scaling with Matrices

    Hey everyone, I understand how to normalize a second order system, but I wanted to know if the same steps are taken when the parameters of the system are not scalar but matrices. For example where the parameter phi, and gamma are both 3x3 matrices and X is a 3x1 vector. From what I've see...
  9. P

    I Scale factor/redshift formula wrong at the end?

    In this video: The professor at the end (at about 7:28), used the formula for scale factor and redshift as a(t) = 1/z, instead of the actual one a(t) = 1/1+z. And when we apply both of them, they give very different results. So, how could the professor use the first formula, which we were...
  10. G

    B Below and above the Planck Scale

    Below Planck scale means inside the Planck scale, and above Planck scale means outside of Planck scale? If the term is correct.. why doesn't quantum gravity theory like Loop Quantum Gravity affect low energy experiments above the Planck scale (outside of Planck scale)? Quantum field theory is...
  11. H

    B Difference Between dB and dBA Scales Explained

    Please can someone explain the difference between the decibel (dB) scale and the adjusted decibel scale (dBA scale) and why the dBA scale is used in preference to the dB scale. I've been stuck on this for ages and can't seem to understand the difference
  12. woof123

    MHB What is the justification for A being a scale drawing of B and an enlargement?

    I'm not following what justifications mean and which one is bigger or smaller... There is a drawing in this problem but here's the rest: "The scale factor from A to B is 41.6%. Justify why A is a scale drawing of B and why it's an enlargement of B. Include the scale factor in your justification"
  13. Ken Gallock

    B Is it possible to do experiment on the Planck scale?

    Hi. I was wondering if experiments on the Planck length (about 10-35 m) are possible or not. If it is possible, what kind of experiment would that be? If it's not, then what is the problem? Or what is need to be done? Thanks.
  14. G

    Kelvin thermodynamics temperature scale

    The thermal efficiency of a reversible heat engine is solely a function of the temperature of the two reservoirs. η = f(θH,θC) = 1 - (QC/QH) (QC/QH) = 1 - f(θH,θC) (QC/QH) = Ψ(θH,θC) The simplest function that can be used is T1/T2 (QC/QH) = T1/T2 In order to define the Kelvin scale we assign a...
  15. S

    Scale Invariant Classical Field Theory

    Homework Statement A class of interesting theories are invariant under the scaling of all lengths by ##x^{\mu} \rightarrow (x')^{\mu}=\lambda x^{\mu}## and ##\phi(x) \rightarrow \phi'(x) = \lambda^{-D}\phi(\lambda^{-1}x)##. Here ##D## is called the scaling dimension of the field. Consider...
  16. B

    I Factor of how much linear size scale has changed

    Question: By what factor has the linear size-scale of the Universe changed between when the light was emitted from the galaxy and now? The question gives the red shift z and I have the equation linear size scale = 1 / 1 + z and I know how to calculate the linear size scale. But I'm a little...
  17. P

    Estimate time scale of expansion of a star

    Homework Statement A star experiences a sudden increase in pressure to a new value P'. Taking the average density as ρ and the radius R, estimate the time scale of expansion of the star. (Ignore gravity altogether). Homework Equations The only thing I can see in my notes that may (or may not)...
  18. Jonas Hall

    A Functional equation f(x)^n f(a - x) = 1

    Hi, In a problem I have been working on for a while now I have found that I want to find the function satisfying the functional relation f(x)n f(a - x) = 1 for n = 1 I believe I have proven that f(x) = x/(a - x). On this page is an answer I do not quite understand. One of the prerequisits...
  19. T

    I Uncertainty in Scale Measurement

    Having a bit of trouble estimating total scale uncertainty. In this experiment, I used four precision weights (error << scale resolution). Each weight has a known mass and is weighted on a scale 20 different times. Therefore, for each weight, I have a mean scale measurement, a standard...
  20. B

    Is grading on a scale a flawed method for evaluating student performance?

    I have always thought that grading on a scale is stupid. When a teacher/professor grades tests based on a scale, the teacher grades each student based on their performance compared to other students. This is a stupid way to do things because it can both cause some students who know the...
  21. Buzz Bloom

    I Cosmology Large Angular Scale Surveyor

    In the spring 2016 issue of the Johns Hopkins Magazine, there is a non-technical article (in graphic novel format) about a new instrument, dubbed CLASS, which is intended to detect "pinwheel patterns" caused by gravitational waves originating in the inflation era acting on the CBR. If these...
  22. U

    At what scale is the charge of an electron -2e?

    The charge of an electron is -e in energy scales well into the atomic scale. At infinitesimal scales it becomes infinite. This relation must be continuous for re-normalization to work, thus the intermediate value theorem asserts that it attains all values between at some energy level. I want to...
  23. C

    Brainstorming: Large scale piezoelectricity generation

    Hello all; Just thought I'd throw a brainstorming question to all you smart guys out there about a subject I know only from the youtube videos I've just come across. Large scale electricity generation from piezoelectricity. I'm aware that this technology is used mostly on a small scale...
  24. Ontophobe

    Does Kinetic Energy Indicate Temperature or Velocity Based on Scale?

    On very small scales, an object's kinetic energy tells you its temperature, and on larger scales, an object's kinetic energy tells you its velocity. Where's the cut off? I mean, velocity is relativistic, but temperature... isn't... is it? Also, black body radiation decreases a body's temperature...
  25. T

    Can one photon be heard by multiple listeners on a radio station?

    In my undergraduate days I remember learning about the double slit experiment etc. in quantum mechanics. And I'm only now starting to learn about the Standard model. So there are these fields; higgs, electro-magnetic, strong and weak nuclear. So if a photon is a perturbation in the...
  26. Henry T

    Safety of a Small Scale Electrolysis Experiment

    I'm going to perform a small scale electrolysis experimenter of water. I want to find out how the rates of the gases are produced when the amount of electrolyte added to the water is changed. I'm going to use baking soda (NaHCO3) as the electrolyte but I just wanted to make sure that I won't be...
  27. S

    Can an Atom's Valence Electrons Be Used as a Radial Antenna?

    As any RF engineer knows the radial antenna is something pure theoretical. But as someone who loves physics an idea came to my mind. Please tell me if this would work and if not, why does it fail to work. So: Assuming we have an atom with 8 valence electrons which is hit with 8 photons with...
  28. chris2112

    Light Waves on Macroscopic Scale: Distinguishing from Matter Waves?

    scientists have observed light acting as waves on a macroscopic scale before the quantum characteristics of particles were discovered. My question is what sets apart the macroscopic wavelike characteristcs of light apart from other matter waves? This may be a stupid question but can the...
  29. T

    Time dependence of the Ratio Hubble length to scale factor

    Let's assume a universe like ours which after inflation expands decelerated and accelerated thereafter. How will the ratio Hubble length ##1/H## to scalefactor ##a## evolve over time? And how could one calculate the time dependence of this ratio. Any help appreciated.
  30. S

    Negative scale factor RW metric with scalar field

    Homework Statement The aim is to find a solution for the scale factor in a Robertson Walker Metric with a scalar field and a Lagrange multiplier. Homework Equations I have this action S=-\frac{1}{2}\int...
  31. C

    Equilibrium Question Involving boat and scale

    Homework Statement A trailer carrying a boat is supported by a scale which initially reads 48 kg. The boat (and therefore its centre of gravity) is moved 0.15 m further back on the trailer. The scale now reads 37 kg. Find the mass of the boat (Ignore the 6.0 m distance because it was not given...
  32. P

    Using calibration data for a beam scale -- How to apply?

    Homework Statement I attached the full document, buy I just want to know about : "Using calibration procedure determine: a) Sensitivity (mV/gr) b) Overall instrument error (gr) c) Linearity error %FSO d) Hysteresis error %FSO e) Precision error %FSO" Homework EquationsThe Attempt at a...
  33. Elvis 123456789

    Normal force reading on a scale -- How and why?

    Homework Statement let's say you have a regular bathroom scale, which we know measures the normal force that it exerts on a person aka. apparent weight. Now let's say that we didn't know that it measured the normal force when a object was on it. Obviously we still know that the only two forces...
  34. A

    Thin Load Cells for Small Weigh Scale Project

    Hi, I'm doing a project and an looking at building a small weigh scale and measure about 40lbs max (even lesser is ok as I'm learning). I'm looking for load cell thickness of 5mm or less (:smile:). I've one kitchen scale that I opened but that load cell is bigger. I looked at the web and found...
  35. M

    Qualitative explanation of scale dependence

    Hi all -- can anyone offer a qualitative explanation of why it is that couplings run with the energy in *relativistic* quantum theory, and not in non-relativistic? Some insight here would be much appreciated. Thanks.
  36. jeremyskate

    Thermodynamics resistance temperature scale

    Homework Statement IMPORTANT:There is an error in the statement.α and β are in C not K 2. Homework Equations R=Ro(1 +αt+βt2) The Attempt at a Solution I really don't know what to do because if I isolate t in the equation it will give me the temperature on the ideal gas scale whereas the...
  37. V

    Equilibrium of forces lab- Sources of error spring scale

    I'm doing a lab where we use three strings connected to a ring, with each string attached to separate spring scales. What would be sources of error in this? And how does friction affect my results?
  38. P

    How to maintain commercial scale CSTR temperature?

    I'm currently doing a design for my final year studies and it's regarding esterification process. My proposed reactor is CSTR, operating at a temperature of 60C and 400 kPa. Reactants are methanol and jatropha oil with sulphuric acid catalyst. For a commercial scale production of biodiesel...
  39. newjerseyrunner

    Over what scale is curvature measurable

    Imagine I have three space probes that I send out radially. They have a superluminal way to determine each other's relative position to each other instantaneously. If each one measures the relative position of the other two and comes up with an angle for them, how far away would they have to...
  40. BiGyElLoWhAt

    On a scale of 1 to String, how speculative is this?

    http://arxiv.org/abs/1503.09158 Is this a legitimite thing? I've never heard of 4th color charge or quark-lepton unification.
  41. B

    MATLAB Want gray scale image of a matrix in matlab

    I am creating a gray-scale image of a 2000*2000 matrix using mat2gray and imshow command.But highest number of matrix entries that imshow can implement is 500*500 approximately.After that it shows------ "Warning: Image is too big to fit on screen; displaying at 8% > In...
  42. N

    Calculating time in a logarithmic scale

    Hi Everyone, I have a question about logarithmic sampling. I think I might have to go and review my Z-transforms, but maybe not. The reason I am doing this is because I am automating equipment which records the data over time, but I want the sampling to be done logarithmically. If I have an...
  43. S

    Nano Fusion? Micro Fusion? Fusion Learning Source?

    When experimenting with fusion, why do we always go so big and make extremely expensive reactors that take years to create and even construct facilities for? I've seen some failed attempts at making fusion happen in carbon nanotubes, failing in the sense that the carbon nanotubes are just...
  44. I

    Understanding dual basis & scale factors

    I'm confused by the following passage in our book (translated). An alternative too choosing the normed tangent vectors ##\vec e_i = \frac{1}{h_1}\frac{\partial \vec r}{\partial u_i}## with scale factors ##h_i = \left| \frac{\partial \vec r }{\partial u_i} \right| ## is to choose the normal...
  45. gatita0225

    What is the magnitude of the aftershock

    Homework Statement An earthquake with a magnitude of 5.4 is 39 times as intense as an aftershock that occurs 5 hours later. What is the magnitude of the aftershock. Homework Equations m=log_10(i/i_0) The Attempt at a Solution I know that I what to find the magnitude m=log_10(39/i_0) I am...
  46. L

    Kinetic Energy - use a log scale or not?

    Homework Statement Lets say we have a series of balls and an eggs. All items have equal mass but are traveling at different velocities. Thus they have differing kinetic energies. Now, for each 'ball' object we have, we want to find an egg object with a similar kinetic energy. Let's say...
  47. T

    Quantum entanglement on a cosmological scale?

    This is a physics question but since it is on a 'universal' scale, I will ask it here. Quantum entanglement. I was watching a panel discussion with Leonard Suskind and others leading theoretical physicists...also watched a Nova program presented by David Green, etc. In both there was a...
  48. A

    Find λ for Non-Uniform Scale & Shear Transformation

    Homework Statement Find the two numerical values of λ such that \left(\begin{array}{cc}4&3\\1&2\end{array}\right) \left(\begin{array}{cc}u\\1\end{array}\right) =λ \left(\begin{array}{cc}u\\1\end{array}\right) Hence or otherwise find the equations of the two lines through the origin which...
  49. I

    Understanding the Planck Scale

    Hi, So I am a little confused on the Planck scale. Correct me if I'm wrong (I hope this doesn't sound idiotic) but I believe that any field on a classical scale should be able to be quantized and work on a quantum scale/Planck scale, where the Planck length and the Planck time are the...
  50. C

    How Does a Scale Work? | Curious Posts

    Hi and welcome to my curious posts :) If a scale measures force then i assume it's measuring mass*acceleration, so does that mean that the scale is actually measuring my mass (like a balance does ), and then multiplying it by a 9.8m/s^2? Or how exactly is it built/programmed to work?
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