Standard Definition and 1000 Threads

Hi Say I have a linear problem Mp = d, where d is our data, p our parameters and M our "observation matrix" (see http://en.wikipedia.org/wiki/Inverse_problem#Linear_inverse_problems). So what we are dealing with is an overdetermined problem. Now, I have read an example where we have a...

Vitamin E (alpha-d-tocopherol) has been shown to prevent creeping arterial occlusion*, increasing cerebral circulation and decreasing the risk of ischemic strokes at a minimum effective dose of 100IU/day**. As a blood thinner (anti-coagulant) it has been shown to increase the risk of hemorrhagic...

I curious if anyone out there knows what structural design standards are used when mounting components onto small Naval and Marine (Zodiac) style watercraft. I can find all kinds of loads and vibration criteria for large ships like Mil-std-810 and Mil-std-167 but all of them specify not to use...

Not sure if this is where this question belongs because the course I am doing is predominately calculus based (Applied Physics, University level) but we have a small statistics component for obvious reasons. Any who, sorry if it's in the wrong spot. Homework Statement Intravenous fluid bags...

Hi If I have measured the resonance frequency of three sets of resonators and calculated the mean, variance and standard deviation for each set. How do I add the three variances and standard deviations to get an overall variance and standard deviation? Well, I know that the standard...

I am working with some wind speed data and need to work out the standard deviation of the magnitude of the horizontal wind. Unfortunately the only information I have is the standard deviation for the streamwise and cross-stream components of the wind (which are orthogonal). Is it possible to...

I'm confused about a premise implicit in the standard QM model of entanglement, which seems logically inconsistent. I understand that entanglement arises when two or more particles interact in some way to become synchronized in their quantum states, which also must be indeterminate in terms...

Something has bothered me for a long time about our model of light: that it has no mass. Just for a moment, forget what you know about light and let's call it the unknown, X, and suppose we want to model it. Here's what we know for certain: X has momentum, as seen by radiation pressure X...

Homework Statement Suppose that the systolic blood pressure of 20 year old females is normally distributed with mean 120 and standard deviation 15. a.) What proportion of 20 year old females will have readings between 115 and 125? b.) If you selected a sample of 64 people from this...

Homework Statement Write a C++ program that accepts 10 floating-point values from a user and determines and displays the average and the standard deviation. All values more than four standard deviations away from the average should be dropped and then the new average and standard deviation...

(solved) Calculate the standard deviation (statistics) Homework Statement From this table of values, I'm supposed to calculate the standard deviance Homework Equations Up until this point, I've had no problem calculating the standard deviance with my calculator by going to STAT>...

Homework Statement evaluate \inte^(\frac{\kappa*x^2}{2KT})dx with limits of integration from -infinity to +infinity using the standard form \inte^(-C*x2)dx = (\frac{\pi}{4C})1/2 with limits of integration from 0 to +infinity. Note κ, k, and T are constants. In the standard form c indicates a...

Homework Statement Evaluate the integral; \frac{2}{L}\intsin2(\frac{\pi*x}{L})dx from \frac{2a}{3} to \frac{a}{3}. Where L is a constant, using the standard form \intsin2(ax)dx=\frac{x}{2}-\frac{1}{4a}sin(2ax)+C, where a and C are constants. The Attempt at a Solution Ok, so I am...

The lambda-CDM model predicts a nearly flat spatial curvature at scales larger than the the scale of homogeneity of the universe. The calculation of many of its parameters depend on the cosmic distance ladder which in turn depend on many observational techniques and statistical comparisons...

So I have a situation that I keep confusing myself with: I am running a computer simulation that, after a set number of iterations (a block) will output the running average (mean) of a property and the standard error based on the previous blocks. So, as the simulation runs, these standard...

Homework Statement Prove the equation(s) for the asymptotes of a standard hyperbola. That is, prove that the asymptotes for the hyperbola x^2/a^2 - y^2/b^2 = 1 are y = -(b/a)x and y = (b/a)x where foci are at (c,0) and (-c,0); vertices are at (a,0) and (-a,0); difference in distances...

The current state of NASA’s version of cosmology is amazing to watch – According to modern cosmology, which NASA endorses, the Milky Way is moving through space at 600km/s and the Earth is moving through space at 30km/s and the sun is moving through space at 250km/s. So if we total up these...

I know 75ohm CATV coax is anything but ideal for 2.4GHz, but I am still curious as to how far these signals will travel upstream through the existing local cable network (splitters, etc) laid by the cable company, and if they could be transmitted between adjacent houses on a street. Example: an...

Some Questions on Lagrange Points – According to Wicki, a Lagrange point is The Lagrangian points are the five positions in an orbital configuration where a small object affected only by gravity can theoretically be stationary relative to two larger objects (such as a satellite with respect...

Hi, I hate the fact that my first post in forum is all about wanting not giving, but I'm only at 1st year mechanical so I don't think there'e much to give :DI was wondering about E399 in the ASTM standard, according to this video (last minute): http://www.youtube.com/watch?v=WlFs2unBvdU We...

I'm a layman trying to understand the symmetries used in the std model. I understand that U(1), SU(2), & SU(3) are incorporated in the Lagrangians for internal symmetries. I've read that SO(3) is also used in the std model for Poincare spacetime symmetry. Is that true and if so, how is it...

Homework Statement x^2+4y^2-8y-6x+9 convert this equation to the standard form of an ellipse and identify the foci, the middle point, Homework Equations x^2/b^2+y^2/b^2 The Attempt at a Solution Ellipse-----> My standard form of this ellipse ((x-3)^2/(2)^2)+((y-2)^2/(1^2))-4 I...

Homework Statement Find the standard matrix for the linear transformation T: R^3-->R^3 satisfying: T([1 2 2]) = [1 0 -1], T([-1 -4 -5]) = [0 1 1], T([1 5 7]) = [0 2 0] All of the vectors are columns not rows, I couldn't type them correctly as columns. The Attempt at a Solution I...

What is the consensus here about Information Theory beyond the Standard model? The three fundamental theories of the universe, relativity, quantum mechanics, and the second law of thermodynamics all involve limitations on the transfer, accessibility, quantity, or usefulness of information...

A quick question from a non-physicist and non-mathematician. Do the equations of the Standard Model (without the Higgs Mechanism and any other speculative theories) presuppose that all the particles have zero mass and zero dimensions i.e. are they purely "mathematical" points?

Homework Statement θ is an angle in standard position with domain 0° <θ< 360° and cot θ = . Find all possible values of θ Homework Equations ? The Attempt at a Solution ?

I remember many years ago, as a little kid, I used to watch a hell lot of National Geographic and Animal Planet. Those were some excellent documentaries and watching them was what got me interested in science and especially life sciences. But for the past few years I have been observing a steady...

Consider the Uniform distribution (continuous) U(-1,1) which has p.d.f. f(x) = 1/2 for -1 < x < 1 and 0 otherwise. I have calculated the Fourier transform using the characteristic function and got fhat(epsilon)= sin(epsilon)/epsilon How do I calculate the standard deviation of this...

Homework Statement The average monthly expense of a certain family during 11 months is 4000 shekels, with a standard deviation of 100 shekels. Afterwards they added to the calculations the family's expense at the 12th month, and they found the average remained unchanged. A) What was...

Homework Statement The grades distribution in class is 10, 8, 8, 7, 7, 7, 6, 6, 4 What's the standard deviation? The Attempt at a Solution I found the average is 7 (which is true) and used the formula for standard deviation. I checked it twice on the calculator but I'm still...

I was reading Baez's FAQ at http://math.ucr.edu/home/baez/physics/Relativity/SpeedOfLight/FTL.html#17" and I came across this nugget Except for gravity, all physical phenomena are observed to comply with the "Standard Model" of particle physics. The Standard Model is a relativistic quantum...

I have a question about Garrity's formula at the top of p. 125, here, for a function from the set of 2-form fields to the set of tangent vector fields, together with the formula on p. 123 for the exterior derivative of a 1-form field and Theorem 6.3.1 on p. 125 (Garrity: All the Mathematics you...

if A \in C nxn,show that (x,Ay)=0 for all x,y \in C[n], then A=0 (x,Ay) denote standard inner product on C[n]

Does anyone know what course will I cover stuff that isn't on the standard Single Variable Calculus topics? In most universities, no one even covers the hyperbolic functions or paramatric/polar coordinates. Most don't even have the time to pick up the power series/taylor series. My...

Let's say I have a big, 50-sided die, with values ranging from 1-50. I want to find the exact standard deviation of the dice roll by hand. I would like to avoid subtracting the mean from each possible value, if at all possible. How do I do that?

Homework Statement In order to construct a character table I need the character of the standard representation. The only problem is I don't know how to find the standard representation of a given group. Homework Equations The groupprops wiki tells me: "Take a representation of degree n...

Hi all - as everyone knows, the fundamental laws of the Standard Model are almost always presented in Lagrangian form. Can anyone tell me of anywhere (such as a textbook) that I might find the Hamiltonians corresponding to these Lagrangians written out? (I'm confused on a couple of points and...

I was hoping someone could point me in the direction of the best way to calculate the rest energy of a proton. I am a complete noob with the standard model, so please be gentle. My goal is to compare a calculation of the energy which accounts for the quark structure of the proton versus E=mc^2...

book stacking -- how rigorous is the standard proof? There is a classic problem in mechanics, which is that you have n identical books, and you want to place them in a stack at the edge of a table so that they stick out as far as possible. Here is a typical, fairly careful statement of the...

what's the standard "name" of this equation so i can look up how to solve it? Homework Statement Find the solution to \left( {\frac{1}{{{r^2}}}\frac{d}{{dr}}\left( {{r^2}\frac{d}{{dr}}} \right) - \frac{{\ell (\ell + 1)}}{{{r^2}}} + {k^2}} \right){g_{k\ell }}(r,r') = -...

Cosmology's standard model: is science becoming a "belief"? I recently made a partially tongue-in-cheek remark on this board about cosmology being a bit like religion. I thought, being April Fool's day, that I might get away with a provocative post. However, it appears that others did not...

hello everyone,:wink: i was reading somewhere that there is C++ and C++ Standard. could some please tell me the main difference between two? and i also read something that some things such as "getch()" are non standard. can you guide me a bit on this? i will really appreciate this help of...

I have a 12v switching transformer; one of the legs on a black brown silver gold 2w resistor is broken off. I have had zero luck finding a standard .01 2w resistor. I did find a current sensing resistor at the values, but should it be used. The resistor in the power supply is ceramic, I think...

Suppose the men in a country have a mean life span of 79 with a standard deviation of 8. And the women in the country have a mean life span of 83 and also a standard deviation of 8. Furthermore, suppose the life spans are normally distributed. What is the mean life span of the entire...

How to convert error to standard deviation? I explain my simple question: I have a program that requests the standard deviation of a physical measurement. But I only have the error, let's say v=-3.445643 +- 1.5%. How do I make the conversion? Please

sort of a parallel thread to the current thread about "fields are more fundamental than particles". pretty much everything i have ever read about particles leads to the idea that what we perceive as particles is really just a manifestation of a field or of interacting fields. since we define...

Hi friends, simple question here. I have a system that needs to be earthed, currently I am connecting it to an earthing rod which I have outside, however it would be more convenient for me to have the system indoors. Would wiring the Earth connection to the Earth pin in a standard UK plug...

Homework Statement A free particle has wave function (i have no idea how to get these come out correctly, so I can't use LaTeX. :frown: Edit on the LaTeX. I'm getting closer! Ok...I can't get rid of the space but that's another subject.:-p...

Is there a standard definition for Philosophy? If not, why? Do you think it is useful to have one? AFAIK, there is no standard definition, because there is no common characteristics between all bits of Philosophy. I think we can solve this problem by concentrating on what is most...

Hi Guys, I am trying to find out if there are any standards / regulations (world wide) for the distance between Electrical and Data cables and or connectors in electrical equipment. There is some info on medical equip. and cabling in buildings but nothing on the actual equipment. Its...