Data Definition and 998 Threads

I wrote this small Excel macro to gather data from vehicles database: Sub ImportCarQueryDB() Call JSON2Excel("2,3,4,8,12,14,20,21,26,27,28,29,31,32,33") ' Specify which fields to extract/import End Sub Sub JSON2Excel(ByVal fields As String) Filename$ = "C:\temp\fiat2.txt"...

Homework Statement I have to do a final project for my Astrophysics class. We're supposed to gather data on the XZ Tauri stars and compare that data to our sun's. I'm having trouble finding data on the XZ Tauri system. Any suggestions? Thank you!

Hi. My name is abi. I was wondering if anyone knew how to remove pupil ghost from images using the rmpupil command in IRAF.

Hello, I am working in an experiment proposal for a contest at CERN, and I need reliable data about the Polar Aurora. The experiment consist in using a T9 beam to produce radiation similar to the Sun's radiation and irradiate with it a capsule with gas in conditions as close as possible to...

The data points of the polarization of the CMB are a magnitude and an orientation that varies between 0° and 180°. What kind of mathematical field is that, not quite a vector field? Thanks for any help!

Hey everyone, Firstly, I apologize if there is a more suitable forum. I think this would be considered a calculus problem, but I'm not sure. I'm trying to develop a RF loss calculator for work that can calculate RF loss over a given length of cable or through a passive device at a given...

Can someone give me a link where I can find data on the size of an H atom (free and in main compounds like water)? If there is none can you tell me roughly the range of sizes or at least what is the ratio between a free atom and a bound atom. I know that for a free atom the radius is not the...

Homework Statement The data contains 2500 integers, each is either a 0, 1 or 2: zeroes: 1240 ones: 1014 two's: 246 Does the data follow Poisson, geometric, binomial or negative-binomial distribution? Homework Equations The Attempt at a Solution The mean of the data is...

I'm getting pretty lost with how initial data works in general relativity. Assuming the energy momentum tensor is known (coupled with the metric somehow), what is initial data required to determine the metric at all later times?

Fortran Error "Unexpected data declaration statement" Hi all, I'm writing a program to perform a linear inversion on a set of magnetic data. I'm fairly new to Fortran, but I have coded Fourier and wavelet transformation programs in it. I'm having a problem when trying to declare my variable...

hello frnz i m aiming to provide a compensation scheme for electrical arc furnance but i don't have practical data to deal with.Is there anyone who could provide me rating of electric arc furnace (KVA rating n power factor).

I've been asked to fit the histogram with a Poisson distribution as part of a mostly independent learning thing. The data was produced through a stochastic simulation. Can someone get me started on how I would go about finding the expected distribution? If you need additional information...

Greetings, I have never worked with any good data visualization tools, but it is a skill I would very much like to learn. Does anyone know of some good free data visualization software? If so, could you please describe it a little bit as well? Eg., is it code-based or drag-and-drop...

I want to use the ray tracing software ZEMAX to calculate reflection and absorption using thin metal oxide coatings on for example plastic materials. For this I need is the real and imaginary part of the refractive index in the wavelength region 1-10 micrometer for the metal oxides ZnO, ITO...

Homework Statement If f(x) is differentiable function satisfying 6x \displaystyle \int_0^1 f(tx)dt = 2x^3-3x^2+6x+5 then select correct options(more than one may be correct) a)f(x) is symmetric about x=1 b)f(x)=0 has no real roots c)f(-x)=f(x+1) for all x in R d) f(x)=1/2 has 2 real and...

I have been wondering lately, is the field of Data Science/Big Data used in the field of Aerodynamics? I know that Data Science has found great uses in areas like bioinformatics, finance, social media and sports. I am asking because the two fields I have grown interest in them. If you work in...

I am trying to come up with a good data-rate formula for a system. The system sends out 'x' symbols per transaction. The transactions take place sequentially, but there is a delay 'z' between them. 'z' is variable and can even be pseudo-random. Also each transaction takes a time as well, but...

llo, I am looking for some good reliable data of radial and axial velocities of an impinging jet on a perpendicular plate for Reynolds number of between 10,000 and 60,000. I am about to conduct my own experiment using an LDA to measure velocities but am looking for some good data to compare...

I gathered some data on kids who were screened for a disorder using two screening tools. Each child was screened using both tools. I wanted to see if one tool referred more kids for further testing than the other. I need to determine if there is a significant difference between the number of...

I'm writing the paper on this experiment I just did. Basically I took sets of data for two variables (x,y) and I fit the points to a line in Origin to extract the value that I was trying to measure (J). *Using generic variables here* I found a value for J where J = [8*∏*x*a(b+c)] / y I...

Hi, This is not really a homework question. Attached is a slide from a statistics presentation I found on the web. I am not sure what conclusion I can draw from this data if I ignore the outlier (1906). Saying "higher magnitude earthquakes result in fewer deaths" seems totally...

I have some very simple questions. 1. What are the real life applications of the biological neuron models (for example Hodgkin-Huxely model)? 2. Is their any online database from where I can get the original recordings data of a neuron? 3. or is there any way that I can...

Homework Statement Using the data found, in this chart, create a time-velocity data table. Time(s),Position(m)[down]: (0,0), (0.25,0.29), (0.50,1.15) Homework Equations v= change in position/change in time The Attempt at a Solution I'm just wondering which sets of data...

I need some help finding an appropriate statistics model for some experimental data. Thanks in advance for any suggestions. I am trying to compare simulated results from a code that models nuclide concentrations in spent nuclear fuel to experimental data. These concentrations have...

Hello, please help me with this problem. The question is in the picture (LOOK AT THE ATTACHMENT). I don't know how to normzalize the data. How to know which method should be used? I need two methods of normalization here. HELP! Please teach me in detail. You don't have to give me the...

Homework Statement I've written some C code that models the motion of two masses attached to a wall (and each other) by springs like this. The output file is 5 columns; the time, and the positions and velocities of each block at that time. I'm not sure how to visualise my data...

Hello, please help me with this problem. The question is in the picture. I don't know how to normzalize the data. How to know which method should be used? I need two methods of normalization here. HELP! Please teach me in detail.

I have two questions: I have a set of data, a measured spectrum. When I model the spectrum with a function, I calculate r2=1-(\sum(y-ymodel)2/\sum(y-yavg)2). Q1) However, I have reference data now, which is what the spectrum should be. So is it right to use the same calculation on it for...

Homework Statement For a reaction, A + H2O --> B + C We're given that d[A]/dt = k[A]n[H3O+]m And also a table of [A] vs time at T1 and pH 1, pH 2; as well as [A] vs time at T2 and the same pH 1 and 2. From this data, we're to find pseudo-n-order rate constants, and then n itself. Next...

So, I've obtained a graph of lab data an it's a plot of thermal resistance versus pressure. Pressure on the x and thermal resistance on the y. If I plot all the points, there doesn't seem to be any trend. The y values are just as likely to decrease as they are to increase with increasing x...

https://www.physicsforums.com/attachments/1729 before I proceed with b, c, and d. what really is meant by the smallest time. does this mean the time of one cycle. there are multiple answers if it calculated for t. the steps I used give one but that may not be the correct process. no ans given

In this experiment, we recorded a person saying "Aaaaaaa" on the mic as the analog source. And then the analog data was converted into digital data so that the programme in the PC could read it and then the digital data was converted into Analog again to reproduce the recorded voice. I attached...

Consider a co-variance matrix A such that each element ai,j = E(Xi Xj) - E(Xi) E(Xj) where Xi,Xj are random variables. Consider the case that each variable X has a different sample size. Let's say that Xi contains the elements xi,1, …, xi,N, and Xj contains the elements xj,1, ..., xj,n where...

I need help as my 17 year old daughter is beating me. A few months ago my wife, daughter and started a competition to see who could get a book published first. My wife has her Master's in education and my daughter is a 4.0 AP high school senior. I have a BSBA from an online degree mill. So I...

Hi, I was trying to plot two sets of data on the same graph and this was my solution but this generates a graph with the x-axis in 0.5 increments where I wanted 1. How do I plot two sets of data on the same graph and customize the increments. Thanks in advance. Also, how would I make MATLAB...

How do you get started learning how to write a program to display and manipulate information from various sensors? What I am mainly interested in are volts and mA's since that's what most transducers and sensors use. I would like to be able to see the information on a computer or eventually on...

Hi to all! I need your opinion about something simple. All we know that in research "industry", in order to visualize their results, they extensively use originLab. Someone told me that "if you want to be called a researcher, then you have to learn origin...". Ok, fine. But I am a Linux...

I'd like to produce a plot that looks like Taken from page 86 of AP French's Vibrations and Waves. I'm searching for some good Texas Tower data. Can you recommend an archive of physics experimental data? Or what I'd like even more is a spreadsheet with some texas tower data.

Hi! I have a problem to resolve this question : I have a total value each month : January = 60 Fébruary = 80 March = 130 April = 150 May = 180 June = 200 July = 210 August = 170 September = 140 October = 90 November = 60 December = 50 I want to calculate the value each day of...

Hi Please see table below GDP growth rates of a group 5 countries. I am trying to derive some conclusions from this small sample. 1. can I conclude that countries in the group have very similar growth rates and there is no significant difference between their growth rates? 2. As...

Hi, I am trying to understand what is the best way to solve problems like the one below. I have a few data points and I need to which function best describes that data. (x, y) = (-3, -32) (-2, 16) (-1, 8) (0,4) (1,2) (2, 1) note that the y parameter in the first data point is -32 and...

Hello, I have written 3D FDTD code with Mur ABC which gives correct results for time domain data. Now I want to compute the resonance frequency of a rectangular cavity using this 3D FDTD code. I don't know how I will do that. Would someone please advise me the steps I need to follow now to...

Hello, I had a chat with a person at work and we were discussing a card shuffle and what governed its behaviour. Here's the shuffle rules. Have to use an even number of cards Take top and bottom card and make new pile the next top and bottom card go below the new pile Here's an example...

I would like to start a thread discussing the opportunities for Physics PhDs in the field of corporate Data Science. This emerging filed is briefly explained in the following article: http://www-01.ibm.com/software/data/infosphere/data-scientist/ I have heard on a number of occasions that...

Not sure where to post this question, but here goes In excel I have calculated the average annual rain for the period 1990-2012 to be 50.2mm . How do you estimate the probability that this measured average (1990-2012) is consistent with the long term mean annual rain for the period 1948-2012...

I need to tabulate the data for u(x,t) vs x. Someone help me please :( this is the program. L = 1.; T = 1.; maxk = 2500; dt = T/maxk; n=50; dx = L/n; cond = 1/4; b = 2.*cond*dt/(dx*dx); for i= 1:n+1 x(i) = (i-1)*dx; u(i,1) = sin(pi*x(i)); end for k=1:maxk+1 u(1,k) = 0...

Data "analysis", I don't understand why this isn't a Gaussian nor a Ma I have downloaded all the elo ratings of all active chess players in May of the FIDE and I have made an histogram. I have plotted the result on a graph rating vs number of people with this rating. I do not understand why...

Hello, I have a data set that follows an equation similar to sin(x)+x. Just from eyeballing the data, it seems like there should be a pretty simple trigonometric function A*sin(B*x)+C*x. I went to school for engineering so I have some basic/intermediate knowledge of mathematics but it's...

Hi, I don't know if this is the proper part of the forum to ask this, but I'm trying to figure out how I can obtain a certain value from an equation that contains an integral if I want to use experimental data. To keep it simple, the equation looks like this: B= (∫G(f)df)2 / (∫G(f)2df) where...

Hello people, I'm working on a research project involving the modelling of a black body's radiation spectrum, and near the limits of the spectrometer, the intensity goes to zero rather sharply. I cannot directly say it is error from the spectrometer, because I simply don't know. However, I...