Standard Definition and 1000 Threads

Hi all, Does anyone know where I can find a tabulation of the standard Sloan/Johnson/etc astronomical filters? Any help would be greatly appreciated! :-) Natski

I've been reading most of the threads here in particle physics forum. Recently, I noted a couple of threads started by enotstrebor which were a bit impolitic. Nevertheless, they raised some issues which are similar to those I have myself with the Standard Model as well Quantum Mechanics in...

i would post this in the chem section but more people view this one.. im having a quiz on standard deviation in chemistry lab onf riday, and I am not sure AT ALL how to do this. i tried asking the teacher but he's not to good at explaining. and i tried lookinga t the difficult to understand...

Hello! Quick question: Is this valid: (\frac{standard \left \left deviation}{average} * 100)? The standard deviation is just a measure of the spread of the data from the average, so by doing the above, is it retaining its 'representation' as a measure of spread, just as a percentage of the...

Does anyone know how the standard equation is for a limit approaching a saturation limit x. I'm trying to model a concave down function where the dependent variable increases at a decreasing rate. see the graph below.

Quick question: why are the standard heats of formation 0 for pure elements?

Hey everyone, I was wondering if you could help me with something. Can someone give me the step to convert the two equations from general to standard form? If you could, it would be such a great help to me. Thanks y= x^2 - 2X + 5 and y= -3x^2 + 12x -4

I am stuck on a few cosmological points I could use some help on. The first being "redshift" as an indication of inflation. To me red shift just seems like it's a result of the degradation of light quanta over long distances. Since light slows down in environments close to absolute zero...

I need to calculate the average time of an event, and I'd like to calculate standard deviation as well. The problem is - there is no such thing as negative time - zero is a boundary - so how does it make sense if the average is 4000us (microseconds) and the stdev is 5000us? Is there a...

This is my first post. I am an aerospace engineer so these very technical computer questions still elude me. My question is mostly about RS422 standard. I have a piece of equipment (LIDAR) that is able to transmit data via a 9 pin serial port. If you put a jumper across two of the pins it...

Hi I have a question. Let X1 & X2 be stochastic variables and X1<=X2, then can we say E[X1]<=E[X2] or SD[X1]<=SD[X2]? why or why not? Looking forward to some reply Thanks!

Hi guys, here i have two question, but i don't understand the answer at all. For the standard enthalphy change question 5) b) i) shouldn't it be standard enthalphy change = Product - Reactant? But from the answer it was given as reactant - product. For question number 8, i don't understand...

Hi guys, I've got this question where i am abit confused by which value should be used. Predict if a spontaneous reaction takes place between a) H2O2 and Cl2 b) H2O2 and I2 c) H2O2 and KI 1/2 Cl2 + e- \rightarrow Cl- (E = +1.36) --- 1 1/2 I2 + e- \rightarrow I- (E =+0.54) --- 2...

i have a vent that is too fast and too loud, and it runs off of US standard ac. i was wondering if there is a (good brand name) device that could limit the rms voltage. i don't want a pair of resistors, that would heat up real fast. i need the voltage cut in half, approximately. an analog...

Have loop quantum theorists looked forward to how one might fit the standard model into loop quantum gravity? Thank you for any help.

Homework Statement http://img338.imageshack.us/img338/5064/picture1nk.png 2. The attempt at a solution I know the area for -1.5 is .0668. I also know that the area of the positive half of the curve is .5000. I don't know how to figure out what the other blue piece is or how much the white...

Homework Statement I am a GCSE Physics student, and my teacher recently set us a homework sheet in which he said contained questions 'exceeding A-Level standard'. He told us to get as far as we could. So, I have completed 12 of 18 questions, but I am very confused about the last 6: 1) A...

Hi, How do you calculate the Mean and standard error of a data set without having to crunch all the numbers? I have a set of data with 45 entries and numbers in the tens of thousands and was wondering if there was a way to calculate these without have to punch hundreds of number into a...

In the article "The Lattice Theory of Quark Confinement", by Claudio Rebbi (Scientific American) there is a graphic representing the chromoelectric field. The caption reads: "Chromoelectric field is a gauge field similar in principle to the electromagnetic field but more complicated...

Hi, I have a regular OLS regression that includes a variable both by itself and squared (i.e. y=b0+b1*x+b2*x^2). I am interested in the marginal effect of the variable at the mean. I know how to get the point estimate, but does anyone know how to get standard errors for the marginal effect...

Hi, can someone just confirm that to get the GSD of a distribution, I simply take the natural log (or log 10?) of all the numbers then find the arithmetic standard deviation of that? Thanks :)

The standard model comprises a particle model of reality, implying that every observable is either a particle of matter or a force carrying particle. QFT seems to imply that particles are merely manifestations of underlying fields - ie, particles are "ripples" in the field. if QFT is the...

The mean and standard deviation of a random variable x are -11 and 4 respectively. Find the mean and standard deviation of the given random variables: 1) y=x+7 2) v=8x 3) w=8x+7 2. Homework Equations : E(x) = u, E(ax+b) = aE(x)+b The Attempt at a Solution I've gotten...

Homework Statement The concentration of retinol (vitamin A) in serum was determined by HPLC with UV absorbance detection. A 1.00 mL sample of serum was placed in a 10 mL test tube. To precipitate the proteins, 800.0 microL of ethanol was added, and the test tube was agitated. Next, a 2.00 mL...

Homework Statement It has been projected that the average and standard deviation of the amount of time spent online using the Internet are, respectively, 14 and 17 hours per person per year (approximately normally distributed). What value is exactly 1 standard deviation below the mean?Homework...

Homework Statement Define T : R3x1 to R3x1 by T = (x1, x2,x3)T = (x1, x1+x2, x1+x2+x3)T 1 Show that T is a linear transformation 2 Find [T] the matrix of T relative to the standard basis. 3 Find the matrix [T]' relative to the basis B' = {(1,0,0)t, (1,1,0)t, (1,1,1)t 4 Find the...

Okay... this is a really simple question but I am pratically going nuts over it I can't sleep, I've been looking at it for like 12 hours, googling and wiking over it I am going crazy... Okie... Suppose I have 4 numbers, 0, 2, 4 and 6 and I grab 2 random ones with replacement... so I have...

The uncertainty is interpreted as standard deviation, then does it mean uncertainty principle only has statistical meaning? I mean, is the principle only meaningful when a particle's momentum and position are measured simultaneously by many detectors?

Homework Statement Sketch the region in the xy-plane that is bounded between the graphs of the given functions. Find the points of intersection of the graphs. 1) y=x^2+2x+2 2)y=-x^2-2x+2The Attempt at a Solution I already completed the square for equation 1): y=(x+1)^2+1 Im having...

I have read before that when color television was developed the frame rate was changed from 30 frames per second to 29.97 frames per second to avoid some kind of problem with the circuitry, but I have never seen an explanation of just what this technical problem was. My somewhat educated guess...

Hello: The gauge symmetry of the standard model is written in authoritative places like wikipedia :-) as U(1)xSU(2)xSU(3). This would have 12 elements in its Lie algebra corresponding to one photon, W+, W- and W0 or Z, and the 8 gluons. I recall reading discussions that such a...

(I have a question about the Standard Model in spite of the topic title. It seems the right place to ask it after perusing the other forum topics. Also, I had erroneously posted this to the "Advanced Physics Forms" where the crickets are still chirping. It's not my intention to cross post...

I'm taking Physics this year. The problem is that the lectures are not going to be in English, my native tongue, and I'm not yet fluent in the language of instruction. I'm an international student and will be dealing with this my entire studies. The book the class is using is Fundamentals...

Given two topological spaces X and Y, there is a standard way to define a topology on X x Y called the product topology. Given a subset S of X, there is a standard way to define a topology on S called the subset topology. Given an equivalence relation ~ on X, there is a standard way to...

I assume we should have commandline and GUI based...like QT and GTK (in linux) right? So if we want to use these i/o interface, we need to include these QT and GTK libraries (which will be most probably included in the QT/GTK-dev package) instead of stdio.h right? Or, is it that the...

Hello, I seriously need some help as I can't figure out what to do here. I am working on coding a vaccination simulation that measures rates of infection for period of 100 days. I have this variable delta, which is the number of days the infection period lasts. Delta is 5, or at least on...

I am an independent researcher ready to compile data from an experiment. I have a set of measurements that include the uncertainties of measurement. If I calculate the mean for the set (and thus the standard deviation) do I need to include the uncertainties when doing this calculation?

How is a standard co-relation forumulated? I always wandered ... how are standard relations [Like famous non - dimensional results for a heat exchanger..like relational between Nusselt,Re number,etc developed and standardised... I mean I want to know the detailed steps behind this...[which...

Does anyone have a high resolution picture of the standard model lagrangian? i want to put it on a t shirt and give it to my math teacher who worked at Bell Laboratories for 10 years and knows just about everything about physics and math. P.S. i only think its called the standard model...

ASME y14.8M tells about the methods of making shopfloor drawing for Castings and forgings. Is there any standard available for making shop floor drawing for sheetmetal parts?

Imagine the public outrage there would be if a mob of white people beat up a black family while shouting pro-white statements. http://www.ohio.com/news/50172282.html

I'm trying to figure out what the standard model of particle physics is, what is included, who decides what's included, and how one would know when a new concept/theory is included or possibly rejected. It would be great to have a list of recent additions or experimental confirmations. Must...

A typical Scientist trying to get Standard Model to work. http://home.comcast.net/~erica.ramsey/StandardModelAndScientists.jpg

I'm new to studying statistics but it seems to me like standard deviation and kurtosis measure the same thing. The higher the standard deviation, the more spread out the data is, while the lower the kurtosis the more spread out the data is. I'm sure I'm wrong about this so can someone help...

I am a little confused about the justification behind what we do with things we believe to be poisson distributed. Take for instance, gamma-decay counts from a scintillation detector. Suppose we got 100 counts using a 1 minute integration time. We would then assume that the distribution of...

in fact, i want to ask, What do prevent the car companies to produce Standard Battery , and all companies use this SB in their cars, where the number of used SB will depend on the car specifications , by this method we can easily go to replace the batteries instead of stop the electric car and...

All - Given a set of data {(xi, yi)| i = 1,2,...,m} and the regression equation f(x) = ax + b, I want to use the simplex method to minimize the equation Sigma [(yi - f(xi))/f(xi)]^2. However, I am stuck on how to initially organize the problem. I am not sure whether the equation, Sigma [(yi -...

If you have doublet Q=(u,d) , and want to give the u-quark mass, you have to connect it to the Higgs VEV H=(\nu,0) doublet through the adjoint opertion: H^{\dagger i}Q_i Connecting H and Q through the Levi-Civita symbol e_{ij} : e^{ji} H_{ i}Q_j results in d-quark mass, not u-quark...

What are the advantages of using the absolute mean deviation over the standard deviation. Is it possible to show a simple example where the former is more (or less) appropriate? Also, related to the mean deviation is my own variation. Does it have a name? Instead of calculating the absolute...

Hello again, I have a question here that asks me to find how large a sample size is, but I have no Standard deviation. How would you tackle this> How large a sample size do we need to estimate the mean annual income of natives in New York, correct to within $1000 with probability 0.99? No...