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. G

    Measuring the Richter Scale with logarithms

    An Earthquake measures 6.1 on the Richter Scale. What is the rating on an earthquake that is twice as powerful? I = I0 × 10M I-intensity of earthquake I0-earthquake with intensity of 0 M-magnitude of earthquake on the Richter Scale So I figured I'd use I1 = I0 × 106.1 to find the...
  2. G

    Solving logs - Richter Scale and Decibels

    the text tells me that for calculating the Richter Scale magnitude of an earthquake we can use: M = log(I/I0) which can also be written as I = I0 x 10M Where M=magnitute, I=intensity, and I0=intensity 0 How are those two formulas equal? Where did the log go? Can someone show me the...
  3. A

    The mass of the pendulum bob was determined on an electronic scale and

    The mass of the pendulum bob was determined on an electronic scale and its diamter was measured using calipers. The initial height was measured with a meter stick. At the lowest point of its swing, the pendulum bob broke a photogate light beam. The time interval that the light was interrupted...
  4. Redbelly98

    Why Do Scientists Prefer the Kelvin Scale for Temperature Measurements?

    Pretty funny stuff! https://sphotos-b.xx.fbcdn.net/hphotos-ash4/309379_450399368314413_942684559_n.jpg
  5. F

    Helium Balloon Weight on an Upside-Down Scale

    If you flip a scale upside down and hook it to the ceiling, then release a helium balloon under it, such that the balloon pushes up into the scale... A. What will the scale reading indicate? Will it really reflect the (negative?) weight of the balloon? B. Will the mechanics of how a scale...
  6. P

    What are the barriers to implementing a large scale smart-grid power network?

    What are the barriers to implementing a large scale "smart-grid" power network? I know that many renewable energies are only available at certain times of the day, or in certain areas. Therefore a "smart-grid" is important for storing and distributing the energy. I see the main issue to be...
  7. W

    Application/Use of 200mV scale in voltmeter

    I was wondering what are the uses of 200mV scale in voltmeter? I mean isn't it too small for most applications? but it seems to me every meter has such small scale ,so I was wondering what is their actual usage?
  8. C

    Rockets - in theory, does thrust scale linearly with mass?

    An example of what I mean: Suppose you had a blueprint for a chemical rocket. You build one, and it has mass m and provides thrust x. Suppose you scale the whole blueprint up by 1% and build another. The volume (and therefore the mass) of each part in the rocket has increased by a factor of...
  9. J

    How do particle scattering cross sections scale with energy in colliders?

    How do particle scattering cross sections scale with energy in colliders? Particularly photons, electrons, protons, and gold or lead nucleii? (If necessary, break this into four separate questions.) It is stated that due to the Heisenberg uncertainty principle, it takes more energy to...
  10. A

    Exploring the Relationship Between Inverse Variables on a Logarithmic Scale

    Let me start by saying my understanding of logarithms is relatively limited, with that out of the way on to my question. The question I have is in a situation where you have 2 items that are inversely related and both have a starting point of 100%. How would you calculate the point where...
  11. R

    Understanding the Scale Factor in the Friedman Equation | Cosmology Explained

    I'm having trouble understanding the part in the Friedman equation where a'/a. I can't figure out why it's the derivative of a over a itself. If someone could give me some sort of analogy to something I already understand that would help. I'm pretty sure a is the rate at which the universe...
  12. G

    What is the scale of our universe?

    the link is worth having a look at to illustrate the scale of our universe http://www.htwins.net/scale2/
  13. A

    Fine structure constant and energy scale

    Hi all, I have a rather naive question about the fine structure constant and the relationship between its value and the energy scale involved. I understand the idea of the a charge being 'screened' by vacuum polarization (i.e., electron-position pairs popping in and out of existence), and...
  14. M

    Solar Sail Physics - Do they work on a large scale?

    Hello physicists! I'm hoping you can help me with a question I'm pondering for a book. At what acceleration could a 4 km^2 solar sail move a 1 metric megaton starship? Assume we're using the solar radiation from the Sol system as our force and that the solar sail in questions is as low mass...
  15. M

    MATLAB Change X & Y-Axis Scale in MATLAB

    Hi, how can i change x and y-axis scale to make sure that x and y-axis are on the same scale in matlab? my x-axis is from 0 80 but the y-axis is from -3 to 5, so in plot the axis are not the same but i want to have same scale on both axis. Thank you.
  16. R

    Motors for a scale model plane (airfix not rc)

    I'm looking to put motors into a scale model plane and was just wondering whether the motors I've picked will be ok and what sort of supply voltage I would need. I'm going to use 4 of these.7 Specs: Operating Voltage: 3.7V Diameter: 7.0mm Length: 25.5mm Output Shaft Diameter...
  17. I

    Would a moving scale read more than a scale at rest?

    Assuming there is a mass on a scale, and they move with the same velocity. I know mass increases for a moving object, but the scale's mass will also increase. So would the scale read any more than if they were both at rest?
  18. O

    How Does Throwing a Sack Affect Scale Readings?

    Homework Statement A man with a mass of 100kg stands on a scale with a sack of potatoes weighing 20kg. He throws the sack straight up. At the instant before he releases the sack, what does the scale read, in kg?Homework Equations n/a The Attempt at a Solution I assumed that because the sack...
  19. E

    How to find scale factor at recombination?

    If we know that the temperature of photons was apprx. 3000 K at recombination and the temperature of the CMB is apprx. 2.725 K today, how can we extrapolate the value of the scale factor at recombination? I know that recombination happens at a matter-dominated era, such that the density goes...
  20. W

    A scale challenge for your brilliant minds.

    Lets take that magical number 1 with 100 zeroes at the end known as google and see what we can put it into. My challenge/ curiosity for the ones who love calculations is this: Not counting for gravity, and using any temperature you choose, how large would a cube of pure lead have to be to...
  21. rhody

    Cost Effective, large scale potted plant rescue brainstorming

    I will get right to the point, a grower of super hot peppers in Florida has almost 10,000 plants of twenty eight varieties in pots, 3 - 10 gallon pots, forced drip irrigated. Many plants are near fully grown, they are staked in their pots to hold them up as needed, and all are under a...
  22. P

    Does Friedmann equation allow for complex scale factor?

    Looking at the Friedmann equation H^2=\left[\frac{\dot{a}}{a}\right]^2=\frac{8\pi G\rho}{3}-\frac{kc^2}{a^2} and considering positive curvature, then for the limit where the second term dominates, we're left with \left[\frac{\dot{a}}{a}\right]^2=-\frac{kc^2}{a^2} This implies a complex...
  23. G

    Decoherence Time Scale for Different Qubit Realizations

    Hi everybody, I've searched all the internet but I can't find the answer to my question. Which are times of decoherence for different physical realization of a qubit? Like, if I use photons, or spin electron, or nuclei, or ion trap, to encode a qubit, which are times of decoherence for each...
  24. M

    Water held in straw by vacuum. Is this possible on grand scale?

    We all know the trick of holding water in a drinking straw by holding your thumb over the top creating a vacuum I know its also to do with air pressure below. I managed this on a bigger scale using a 2inch pipe, a water pump and a valve i could close at the top of the pipe to replicate the...
  25. S

    Origins of Scale Factor of FRW Metric and Misc Questions of GR Equations

    In the context of Friedmann's time, 1922, how did he know to make the metric scale factor, a, a function of time when Hubble's redshifts were not yet published? I understand that he took the assumption that the universe is homogenous and isotropic, but does that naturally imply that the universe...
  26. C

    How to plot Ixt with monologarithmic scale and find linear fit

    I have some experimental data of a simple RC circuit, which I measured in fixed time intervals the current through an microamperimeter, and now I need to make an i(t) × t graph, with the vertical axis on a logarithmic scale (so my points fall into a 'straight' line), and then I need to find the...
  27. pellman

    The scale of the action integral?

    Since the Euler-Lagrange equation is homogeneous, the equation of motion of a system of particles or a field is independent of the scale of the Lagrangian. That is, we can multiply the Lagrangian by any constant and arrive at the same equation of motion. But does the scale of Lagrangian or...
  28. B

    Calculating the gradient of a logarithmic scale

    Homework Statement hi i have the folowing data i would like to plot in matlab plotERRLW = 0.0466 0.0111 0.0074 0.0046 NX = 50 500 1000 2000 i am using a logarithmic graph to gain a straight line, if i wished to find the gradient of the line...
  29. Z

    Small scale effects of expansion, and 'bound' objects

    I often hear something to the extent of, 1) "despite cosmological expansion, small-bound objects do not expand." and further, 2) "things like galaxies will aways remain bound, and will not expand." Pertaining to 1) Because cosmological expansion is a coordinate property, don't small scale...
  30. J

    What does the scale reading represent?

    Say that an object is placed on a scale and it gives a reading. Does that number represent the object's weight (w = mg) or mass (just m)? I'm a bit confused because my physics teacher told me that it is measuring its mass...is this correct? Many thanks.
  31. H

    Scale Hanging From Ceiling of Elevator Question

    Homework Statement An object is hung from a spring scale attached to the ceiling of an elevator. The scale reads 65 N when the elevator is standing still. What is the reading of the scale when the elevator is moving upward with a speed of 7.6 m/s and decelerating at 2.4 m/s^2? Homework...
  32. S

    How can one derive surface area Jacobians in spherical coordinates?

    So I've been trying to figure out how to find the surface area Jacobians in spherical coordinates (I know how to use it to find the volume Jacobian). Using the divergence theorem I was able to find these Jacobians top-down, however, I am unsure to how one would derive them in the first place. I...
  33. jaketodd

    What is the scale or density when the double slit experiment stops working?

    I know even molecules can be used and the result still emerges. What is the density of [pick a type] of atoms or molecules when the experiment stops working? Also, as you increase the density of whatever you're using, does the result get less and less like what you get when you use photons...
  34. E

    Weight on a Scale Down an Incline vs. True Weight

    Weight on a Scale Down an Incline vs. True Weight Homework Statement Judy fastened a set of bathroom spring scales to a wedge shaped skate board as shown and coasted freely down a 30 degree slope. The wheels were well oiled and the platform supporting the scales was horizontal. What...
  35. S

    Why world looks chaos on atomic scale but it is uniform on higher scale?

    Hey guys, I am thinking about world at small scale and world at larger scale. Why world is more chaos at smaller scale and why it is more smooth and uniform in larger scale?
  36. MTd2

    Smallest scale of practial perturbative expantion?

    It seems that Chiral perturbation theory is valid between 100MeV and 1GeV, perturbative qcd, above ~5GeV. So, is there any method that works in good approximation bellow 100MeV, besides lattice methods? What about the interval between 1GeV and 5Gev? I read at ressonaances blog...
  37. N

    Time Scale of Atom: Understanding EM-Beam Coherent Force

    Hi I am reading about the force of a coherent EM-beam acting upon an atom, and I have a question in this regard. It is regarding the explanation on page 150 of this book, starting from "The geometric approximation of atom optics is valid when"...
  38. M

    Biological Engineering on a large scale

    Why aren't we still able to create/alter organisms for energy and food production, since we can easily sequence and cut and paste DNA?
  39. B

    Does size and scale affect speed

    Hello I am newto this and maybe it is an easy answer. Here is my question. When I travel in my car at 60 mph. I travel as a whole with the car at 60 mph. But at an atomic size and scale don't the atoms that make up everything really travel faster? Because at that scale wouldn't it be much farther?
  40. Greg Bernhardt

    Is the Flash Scale of the Universe Animation Still Relevant?

    Not sure if this is old, but it's an interesting little animation! http://scaleofuniverse.com/
  41. P

    Scaling expression for better data range?

    Hello everyone, I have a bit of an issue regarding scaling of an expression. So, the scenario is as follows. I have a confidence value that can be associated with the solution given by an optimization routine and it is as follows: C = exp(-A)/(exp(-A) + exp(-B)) where A, B and C are...
  42. C

    Scale of the Universe: Zoom-In, Zoom-Out Animation for Kids

    This is a zoom-in, zoom-out animation that explores various objects from the very small (plank length) to the very large (Sloan Great Wall). Judging from the descriptions, I think it's intended for children. http://images.4channel.org/f/src/589217_scale_of_universe_enhanced.swf I lold...
  43. L

    How Is Large Scale Sonication Applied in Field Settings?

    Dear all, I am looking for literature describing the application of large scale sonication. Something like sending ultrasound through the ground. I know it has been done, but I was unable to find anything about it. Can anybody provide some suggestion? Many thanks
  44. Ryan_m_b

    Scale of the universe animation

    An absolutely amazing animation: http://images.4channel.org/f/src/589217_scale_of_universe_enhanced.swf Link broken http://www.newgrounds.com/portal/view/589217
  45. L

    Why doesn't Diffeomorphism Invariance lead to Scale Invariance?

    One of the foundations of General Relativity is diffeomorphism invariance - the fact that the laws of physics are invariant under smooth coordinate transformations, and thus the laws must involve tensors. My question is, why doesn't this imply scale invariance; after all, isn't a change of...
  46. R

    Measurement problem involving scale

    A rectangular park has an area of five hectares (1 hectare = 10,000 meter square) The dimensions of the park on a map are 5 cm * 4 cm What is the scale of the map?
  47. N

    Many world interpretation on large scale

    can many world interpretation be valid for large scale collapses that brings out a single reality?
  48. G

    Does Speed Of Light Scale With Size?

    My teachers in school use to say. "the dumbest question is the one not asked", but I might just break that rule with this one. :smile: Here goes... I've been reading a lot of articles today on light travel, the Higgs field, and other fascinating stuff. Lastly, I was just reading an article...
  49. O

    Addition of Vectors using a scale diagram

    Homework Statement Add each set of vectors by using the scale diagram C=28km 20 degrees north of east; D=34 km 30 degrees west of north Homework Equations The Attempt at a Solution Attempted to create a triangle with a right angle; then Pythagorean
  50. K

    Harvesting Load Cell from Food Scale

    Hello, I've been toying with the idea of making a cheap dynomometer for small electric motors, but one of the obstacles I'm encountering is finding a cheap load cell. The best I've done so far is a $75 sensor from Omega, which still requires conditioning. Then it occurred to me that you can...
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