What is Scale: Definition and 743 Discussions

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. A

    Meaning of Scale of an events/process in MonteCarlo

    Meaning of "Scale" of an events/process in MonteCarlo Hi there I do have this question - I often hear that "this depends on the scale of the process" for example when it comes to match the matrix-elements with a parton-shower program (I am new to MonteCarlo world) so, what does "scale"...
  2. C

    Using the Ideal Gas temperature scale

    Homework Statement Below is some values of the observed values of pressure P of a gas in a constant volume gas thermometer at an unknown temperature and at the triple point of water as the mass of the gas used is reduced. ##P_{TP}## (torr) | 100 | 200 | 300 | 400 ##P## (torr)...
  3. R

    Very Small Scale Power Generation in Rural Asia

    Hi, I volunteer for a small group who try and help the families who live in the rural parts of Sri-Lanka We have built and donated a large number of solar powered lanterns but during the rainy season (or even on cloudy days) we don't get enough sunshine for the lights to work for their...
  4. E

    What is the weight and scale reading during elevator acceleration?

    Homework Statement A 65-kg woman descends in an elevator that briefly acclerates at 0.20g downward when leaving a floor. She stands on a scale that reads in kg. (a) During this acceleration, what is her weight and what does the scale read? Homework Equations ƩF = ma mg - Fn =...
  5. G

    Does mass depend on energy scale?

    In MS-bar scheme, the mass m is not the physical mass but runs with scale. The physical mass should however be constant. In that sense it seems you can't just regard mass as another coupling constant. Physical coupling constants must be defined at some scale, while the physical mass is...
  6. marcus

    Which: scale or years? as parameter of change

    The first stars formed when distances were 9% of their present size. The solar system began forming when distances were 70% of what they are now. Andromeda galaxy will make a first pass through Milkyway when they're 129% of present. Which do you find more meaningful and intuitive for...
  7. marcus

    Switch to scale factor time (universe its own clock)

    Switch to scale factor "time" (universe its own clock) In a sense the universe is its own clock and the pointer-hand is the scalefactor, as in: "when distances were 0.1 what they are today" "when distances were 0.3 what they are today" "when distances were 0.9 what they are today" For some...
  8. G

    Commercial Scale Desalination via Electrolysis

    Gday all, ive been trying to find out why electrolysis isn't used / less feasible than RO in sea water desalination? The chemistry for NaCl electrolysis is well understood and thus works, so why is it not feasible/less feasible than say RO whereby we are essentially pumping water through a...
  9. C

    Dimensional regularization and renormalization scale.

    Hi. I have observed that Ryder in his book on QFT before doing dimensional regularization introduces a scale ##\mu## in order to keep the coupling constant dimensionless in the lagragnian. However in two other books; Weinberg and Peskin and Schroeder, they do not introduce this scale in the same...
  10. B

    MHB Calculating Scale on a School Map

    Not sure if this is the right category but i need help. On a map of a school, 3 inches represents 9 feet. How many inches would represent 1 foot 6 inches?
  11. B

    Scale Design Using an Angle Measurement for Weight

    Homework Statement I have to design a scale to weigh something under 1kg and all am given is a yard stick, 10 ft of fishing line, a 500g known standard mass, and a protractor. Use an angle measurement for weight. Don't just balance weights on a see-saw Homework Equations - The...
  12. M

    Quantum Scale, Statistical Physics

    So the probabilistic studying of Quantum statistics of Böse-Einstein suggests that we permutate the number of objects (objects, are the blocks (Gi-1), and the particles in the boxes Ni) and divide those by Ni! And (Gi-1)! Because these particles are identical. But the case of Fermi-Dirac, where...
  13. C

    Accelerator size and probe scale relationship?

    Wondering if anyone has developed a scaling heuristic for the relationship between size of accelerator and smallest size that can be probed with it. With so many data points, something ought to emerge, perhaps a modified power law. Adding a time axis could make a Moore's "law" projection for...
  14. S

    Large Scale anomaly in Planck data

    Just watching tweets come out of the conference, apparently there is a large scale anomaly that has come out of PLanck . One tweet says challenge to inflation, another says could be pre big bang physics. Obvioulsy I am just reading tweets, so not sure what's real yet. But this could be exciting...
  15. M

    Requirements for Water Spout pressure trick, at 100 scale?

    Hello this is my first post, so if I am supposed to move this to another forum section please advise I would be happy to http://foryourwater.com/mm5/graphics/00000001/3_gallon_dispensing_water_bottle_lg.jpg As for my question, I am referencing the example of a water dispenser above, after...
  16. atyy

    Strings without low scale supersymmetry

    Are there stringy candidates for reproducing the SM and dark matter etc without low scale supersymmetry?
  17. F

    How does electroplating work at the atomic scale?

    Hi, I am trying to understand how electroplating works. With help of this wikipedia diagramm (http://upload.wikimedia.org/wikipedia/commons/thumb/b/b6/Copper_electroplating.svg/471px-Copper_electroplating.svg.png) I have already figured out (correct me if I am wrong) that it works something...
  18. N

    What Does the Scale Read When the Elevator Moves Downward?

    Homework Statement Harold has a mass of 72.2 kg, and is standing on a scale in an elevator cab. What will the scale read if the elevator is moving downwards at a constant 0.050 m/s?Homework Equations The Attempt at a Solution Since the scale has a normal force upward and Harold has an...
  19. K

    How do you use vector scale diagrams to find total displacement?

    Just a quick question. When you are given two vectors, let's say 5m (E32N) and 6m (S23E) and we are to find the total displacement. Do you draw the first vector and then attach the second vector to do the head of the first vector? or have both vectors start a the origin.
  20. A

    Scale factors and the Jacobian Matrix

    So here is my problem: I'm very bad when using coordinates others than cartesian ones, and I know taking Mechanics of Lagrange and Hamilton and I fin difficult to find the velocities expressions in curvilinear coordinates. So here is my question: is there anyway to relate the scale factors...
  21. P

    RC-Blimp propulsion system on larger a larger scale

    Hi everyone, and thanks for reading my very first post in Physics Forums! I have been researching a way to construct a single person aircraft with vertical take-off and landing using a propulsion system similar to that of an RC-blimp. I found a video on youtube that illustrates the principle...
  22. A

    Insight on holography at the planck scale

    Part of my basic understanding of the holographic principal is that the amount information in a given area of space is less than the surface area that surrounds that region (measured in Planck units squared). The exception being that in the case of a black hole the information stored within an...
  23. X

    Difference in shape, LxWxH, most similar proportions, regardless of scale

    this is not actually for homework, I am no longer in school, this is for a small application I am trying to write that compares dimensions. However, I believe this is the appropriate spot to post after reading the rules. Homework Statement okay, so let's say you got a shape, for example a...
  24. B

    Pressure At Surface And Scale Height

    Please can someone tell me if my thinking here is right... I've got a planet with an atmospheric pressure at 6km of 0.5 P0 and at 8km of 0.4 P0 (P0 = pressure at the surface). I want to work out the scale height of the atmosphere. Given scale height = λ and for height above surface...
  25. C

    Question about gravity on the large scale.

    I was thinking about olbers paradox and how I could apply it to gravity. We assume that their are an infinite amount of planets and that they are all about the same mass or we will just pick a minimum mass. And we assume they are evenly distributed. So the gravitational field falls off...
  26. C

    Large Scale <-> Small Scale failure of intuition.

    If at very large scales of matter our intuitive logic fails to explain it (Black Holes) and at very small scales of matter untuition again fails (Quantum effects) then is there a connection between those two groups of phenomena?
  27. Pythagorean

    News Politics of Scale: US Republic Unmanageable at Large Scale

    This video puts forth the idea that an institution the size of the US (in terms of population) is unmanageable as a republic as the concept because a republic was designed for a smaller scale.
  28. DiracPool

    Is The Solar System Scale Invariant? A Thought Experiment

    Just a thought experiment. Imagine you made scale models of the sun and the planets with the relational standard of measure being a sun the size of a basketball. Now assume that the sun and the planets were all built to scale with the appropriate diameters, densities and masses of the actual 8...
  29. B

    How to scale a velocity profile

    Hello, I am reading a paper in which the author describes how he scales the velocity profile of a car. He is doing this so that he can compare the velocity profiles of cars. This is an extract from the text: The first methodology consisted of evaluating the similarities between...
  30. H

    Calculating the scale factor (cosmology) for a universe starting at the Big Bang

    Homework Statement Show that by using the Friedmann-equation you can determine the scale factor for a Universe in it's early stages (starting with the Big Bang) to: Homework Equations The equation for the scale factor: Where r(t) is the distance from us to a given galaxy to the time t...
  31. Chronos

    Is a tabletop search for Planck scale signals feasible

    This paper - http://arxiv.org/abs/1211.3816 - by Beckenstein is fascinating. I would like to know if the experimental test proposal is realistic.
  32. F

    Why does a Scale Balance Horizontally?

    This may seem like a really dumb question, but I can't figure out what the answer is, so please just bear with me. Why does a balance that is equal come out straight? If one side is tilted slightly lower than another, shouldn't it just stay that way since the masses are the same on either...
  33. G

    True Stress-Strain Curve on the Log Scale: Which portion is the plastic region?

    My math is a little weak, so I'm having a hard time finding the elastic and plastic regions on this curve. Any further help will also be appreciated!
  34. C

    Does standing on bathroom scale depress or compress spring

    I am unsure how bathroom scales work. Does your weight compress or depress the spring? Do scales measure the upward or downward force? Please explain in detail.
  35. C

    Person sitting on scale on roller coaster

    Homework Statement A 120 pound person is sitting on a scale during a roller coaster ride. As the roller coaster goes over the top of a curve whose radius is 30 feet, the scale indicates a force of 25 pounds. The average speed of the roller coaster doesn't change while over this curve...
  36. D

    Scale on Top of Rollercoaster

    Homework Statement You take a bathroom scale onto a stand-up rollercoaster (the riders are always in a standing position). Before the ride starts, you stand on the scale and note that it reads 65 kg. The ride starts and at the top of the first loop you are upsidedown and your scale reads...
  37. P

    Determinism & Scale: Quantum Effects on Macroscopic Objects

    Hi everybody, there is this question that is bugging me and since I neither seem to know enough about physics to find out the answer myself nor to have the time to acquire said knowledge I will try to ask it here. Objects of the microscopic world famously behave in an indeterministic way...
  38. J

    Computing Jupiter's Thermal Time Scale

    1. Jupiter radiates more energy than it receives from the Sun by 8.7x10-10L0. Jupiter's radius is 7.0x109cm and its mass is 1.9x1030g. Compute its thermal time scale. Could gravitational collapse power this luminosity for Jupiter's entire lifetime of 4.5 Gyr? 2. Kelvin-Helmholtz (aka...
  39. D

    Determining Scale Readings on an Atwood Machine

    Homework Statement Two masses, measuring 800g and 400g respectively, are attached to spring scales and an Atwood Machine. What will the reading of each scale be? https://www.physicsforums.com/attachments/52223 Homework Equations Fg = mg The Attempt at a Solution I think that...
  40. DiracPool

    Survey: Scale IN Variance in Physics Education

    Hello, I consider myself an up-and-comer theoretical physicist (although getting a bit of a late start), and there's something that continues to trouble me about the way physics is taught both professionally and popularly, and I want to survey how others feel about the issue. The issue is the...
  41. S

    Are Random Walks with Different Step Sizes Identical in Brownian Motion Limit?

    Consider a random walk (in any dimension) with N steps and a step size of 1. Take a real number \alpha > 0 and consider another random walk which takes \alpha^2 N steps but wil step size \frac{1}{\alpha}. I immediately noticed that the mean deviation after the full walk in both cases is the...
  42. S

    Coarsely modeling impacts between bodies on a planetary scale

    Wheeee! More confusing thread titles! Here, let me elaborate: What I intend to do here is figure out a way to roughly model the results of planetary (or larger) bodies impacting, or a planetary (or larger) sized body being impacted by a smaller body that is moving with enough relative...
  43. A

    What is the acceleration of the elevator in these scenarios?

    Homework Statement A student stands on a bathroom scale in an elevator at rest on the 64th floor of a building. The scale reads 828 N. (a) As the elevator moves up, the scale reading increases to 919 N. Find the acceleration of the elevator. (b) As the elevator approaches the 74th floor, the...
  44. D

    How powerful can a compact maglev system be with neodymium magnets?

    How small can a maglev propulsion system be? What's the relationship between the size/strength of the magnets and the load capacity of a maglev vehicle?
  45. S

    Can wave particle duality be viewed at macroscopic scale ?

    can wave particle duality be viewed at macroscopic scale...?? ok so far we have discussed the wave particle duality in case of electrons of-course at microscopic level through the 1) interference phenomenon showing its wave behavior 2)photoelectric effect discussing its particle...
  46. P

    Mass vs. weight with a falling rock and a spring scale

    Homework Statement 1. You stand on a spring-loaded bathroom scale in a bathroom. The scale "reads" your mass. What is the scale actually measuring? 2. Similarly, you stand on a spring-loaded bathroom scale in an elevator that is accelerating upward at 2.0 m/s^2. The scale "reads" your mass...
  47. G

    Standing on a scale at the equator

    Homework Statement Homework Equations F→scale + F→g = ma That's my guess. The Attempt at a Solution Well, I'm reading it in the book. It's an example with the answer that the scale reading will be less than my weight. But I still don't understand how that works out to be...
  48. X

    Use Newtonian Model to determine what the scale reads

    Homework Statement The strings attach to a scale which reads the force. What is the force that the scale will read? Homework Equations F=ma according to Newton's Laws. The Attempt at a Solution Thinking logically, I simply calculated the force of the left side: F=ma...
  49. C

    Logarithmic Scale: What Happens When Plotting x,y Values?

    Hello people, I have a question about the log-scale. What happens when we switch a plot from linear scale to the log scale? Let's say I have two arrays: x values and corresponding y values. I plot them using a linear scale and then I switch to the log scale. What happens? Does the program...
  50. H

    Trying to understand the normalisation of the scale factor to be 1 today

    Hello all! I'm trying to understand the standard normalisation of the scale factor to be set to 1 at today's time. Looking at the first Friedmann Equation for a spatially flat Robertson Walker metric with no cosmological constant gives \frac{\dot{a}^2}{a^2} = \frac{8\pi G}{3}\rho If we...
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