Data Definition and 998 Threads

One more question - I'm working on a problem in which I need to determine the values of R and p in the equation: {E_{B} = -RZ^{2}n^{p}} Where Z is 1 (we're using a hydrogen atom), and n is the principle quantum number of the electron. I know p is 2, but the point of the exercise is the...

Hi physics forums. I'm a 4th year student in Applied Physics. Originally I had no idea what I wanted to do with my education, or what useful skills I was learning. This year I've got a lab course and a computational physics course that have piqued my interest. I'm really enjoying...

Why it's not explained just by Doppler redshift caused by faster movement of those galaxies billions of years ago when that light was emitted? Would the speeds of the galaxies necessary for Doppler redshift to explain all of the observed galaxies redshift be unreasonable or is there something...

Let's assume there's a magical ball that bounces once every .5 seconds, and that there was a specific machine designed to calculate the rate of the ball's bounce (with error). After performing numerous readings of the ball's bounce using this machine, you have a collection of values describing...

Homework Statement I have conducted a simple lab, that involves getting the distance traveled by a vertically falling weight at certain time intervals. Velocity is calculated for every time interval (distance traveled per time interval). Then I graph velocity versus time to get acceleration...

I am an undergraduate student studying Computer science and engineering (2nd yr). I have studied the basics of C programming and have started studying data structures. But I find it oddly difficult to get hold of a good book that explains basics and the algorithms used for various data...

Hello Im working on a project and I am looking for a place to find nuclear data. For example I'm Interested in Ferromagnetic substances in which the nuclear decay decreases by unit through Electron Capture Is there a place where i could sort data like this? Any info would be appreciated

This is the QQPlot of a data. What can be inferred from this plot ? (Tested against Normal Distribution) QQPLOT 1 : QQPLOT 2:

I was looking for a fortran code wherein the stored file in DAT file will be stored once I run the program again. My program is just replacing the saved file.

Hello all. I am performing chemistry experiments and recording the times of various observed results. What I am doing currently is performing the test several times in order to determine what result is "normal." My goal is to determine a range as a standard by which all future tests will...

Significant Figures in Data Suppose I have two recorded Molarity of a certain solution. And the data I have are: 0.092 M and 0.095 M --- which both has 2 significant figures. If I were asked to get the AVERAGE MOLARITY of my substance, then I'd do: (0.092 M + 0.095 M)/2 = My AVG...

Hi. Suppose I load data from a .csv file: Blah @Blah 2Blah Blah f Blah fa Blah Blahasd Blahasda vasf Blah as Blah asdas Blah Date Time Ch1: 07/25/2012 42:46.0 96.385 07/25/2012 42:46.0 -177.608 07/25/2012 42:46.0 155.481 07/25/2012 42:46.0 64.15 an attempt would be to...

Hi I am struggling with a problem here. I have 6 data points, and I have found the solution of a model which I believe should describe the behavior of the data. Now I am trying to fit the parameters of the solution to the 6 data points. The model contains 5 degrees of freedom, all of which...

Hi there, I require some advice on how to interpolate more data points on a bump profile. Basically i have a curve defined be twentyfive (x,y) data points. The bump is meant to accurately represent half of an aerofoil. I would like to accurately interpolate more data points (lets say up to...

Homework Statement There is a problem in which we are supposed to calculate the focal length of a diverging lens by putting it in series with a converging lens of known focal length and measuring the resulting image. Distances of objects all from a single common reference point...

Matlab fprintf "%" usage in output data I want to save data into a textfile, but I will again need MATLAB to read that text file, in which case, I would like to have my header-text of the data table begin with '%" so that when I am reading from than file, MATLAB will ignore header. I am...

I am using a verlet algorithm in c++ to model the motion of a satellite, and want to output position and velocity data from each timestep so that I can then read it into MATLAB and plot graphs to see how well my model matches the 'real life' graphs. so far I have at the end of each iteration...

hi i have two file with following data file-1 (named: xyxp.dat) 6 1 1 0 10 3 2 1 5 3 5 4 8 0 0 0 11 1 2 5 4 5 6 4 12 file-2 (named: xyzn.dat) 6 1 0 0 0 2 1 1 0 3 3 2 1 4 1 2 5 5 3 5 4 6 5 6 4 now i want to match each value of the first three columns of file -1 with the corresponding...

Homework Statement Based on values for the Van der Waals equation tabulated in Table 1.6 in appendix A, determine an approximate molecular volume for CCl4 and CH4. Rationalize these values based on reasonable bond lengths and other parameters. The Lennard-Jones potential energy function is...

i am trying to learn AIPS in preparation to doing research in radio astronomy. I know the basics of radio astronomy and that AIPS is used to reduce data and remove errors from images due to atmospheric disturbances, but I don't really know what kind of errors in the data I should be looking...

Hello. I'm supposed to plot a bifurcation diagram for the logistic map. What I'm trying to do is calculate 1128 iteration of y=a*y*(1-y), scrap the first 1000 and write the last 128 points of data in the LogisticMapDiagram.dat file and then plot that with gnuplot, but the value of y stays in...

Does anyone have a good source of saturation data for nitrogen at low pressures? By low pressures, I mean something along the lines of 0.01 atm. Thanks,

I have a question that is confusing me. If traffic in a network is being generated from a Pareto distribution, And I am estimating this traffic rate at each packet arrival, If I was to take the previous x estimated rates as a sample of data, Would the distribution of these estimated rates...

Hi, I'm a Mechanical Engineering student and the voodoo that is electronics/ electrical engineering baffles me. However a portion of my final year project requires me to specify certain transducers and a data acquisition system. At the minute I am trying to specify an accelerometer...

I am using the matched filtering technique to extract the data from a heavy noise background in the process of detection of gravitational waves. I calculate the correlation between the experimental data and a theoretical template. I have been told that the maximum of the correlation function...

Real time water quality data This is data being taken NOW. Note that it links to several sites around the US.

Hi guys I'm helping my girlfriend with her Calc 1 homework and we seem to be stuck on this one problem. Am I missing something obvious? Homework Statement Homework Equations P = P_0 a^t \frac{5}{20} = \frac{P_0 a^1}{P_0 a^{-1}} \frac{1}{4} = a^2 a =...

Hi, I have been working on molecular formula determination for biojet fuels. Can someone help me here please. I need to find out the molecular formula of Neat Algae jet fuel. I have been provided with the carbon-type (n and iso types) mass fractions for blended jatropha/algae fuel and neat...

How to derive formula for the series of numbers as below: (a) 4,8,15,16,23,42 (b) 4,17, 23,38,41,46

Hey everyone, I'm not sure if there is an effective answer to my problem, but here goes: I am working on Ramachandran plots for short peptides (3 amino acids long). For every snapshot of the protein (this would be my data point) there are two angles being recorded, the phi and psi angles...

Copy the table and determine keepers third law constant ku for Uranus using the data for the first floor moons sorry for the mirror effect its the only way i could get the page so you could read it .. its on the right # 32 b) find the average of the Ku, values of your calculations...

Do anyone have any software by which i can make a vector diagram from a group of points.you can think it like..suppose you have x & y component of a vector at a point..you can draw that easily but i will have to draw a vector diagram for 100 or more points arranged on a surface...i will give the...

Hello fellas. I have this formula that encodes data: OUTPUT = (Data * 7) + (Data * 2) + 8 So in this case, if I have the OUTPUT, what is the data. What formula can I use if I have OUTPUT to get Data? Thanks much!

My task is to estimate / compute accuracy of a gps receiver. My experiment would involve using three GPS receivers and post processing software. following is the nomenclature i would follow for explaining my question. Normal GPS receiver: This is the receiver in test, a simple 12 channel...

Homework Statement Essentially there is a power line which must be strung between posts on two mountains which are 1669.602m apart. The first mountain is 5m higher than the second. To overcome tension the wire is strung with a sag, 1m of sag for every 75m, or part thereof. This sag is...

I understand that the Wilkinson Microwave Anisotropy Probe has made observations of the angular size of early fluctuations in the Cosmic microwave background. As the observed angular size is the same as the expected angular size it seems that light traveling to us from those early fluctuations...

I work as a research assistant in a ceramics laboratory,a very reputed university.I model and analyse internal stress of certain mechanical components,its super-fun.But,the bad part is when I have use the empirical data and fit into an model.Take for example the mathematical modelling of phase...

I need a list of type Ia supernova with redshifts, Distance Modulus, Distance modulus error, and position in galactic coordinates, but I havn't been able to find one that has all of that information (I have found several with some of the information, but not all of it). Does anyone know where I...

Homework Statement Problem: find the thickness of a Pressure Vessel. Given: Operating Pressure, Operating Temperature, Material type and Grade, and OUTSIDE Diameter/Radius Homework Equations q1. how to calculate Design Pressure/Temp. from Operating Pressure/Temp.? q2. how to calculate...

How do you go about combining data from replicated experiments? Should you just combine everything into one big set of data and then analyze it, or do you analyze the data from each experiment, and then combine the analyzed data into one set of finalized data? I'm not too sure on what to do...

Hello there! This is my first time posting, but I'm a long time reader. I could not find a more appropriate sub-forum. I have just been hired to compile and organize data for an arctic hydrology research project in Fairbanks, AK. They are studying climate change and have recorded a few...

In Particle Data Group booklet, many refined determinations of the masses and decay widths processes are collected and listed in a fabulous way. But it is still (at least for me) to find the sources of these Data, I mean from which experiments, FOCUS, or BELLE..., are taken? is there other...

Homework Statement This is not homework. I am having trouble interpreting this data. I don't see how it satisfies a conservation of mass. As the temperature is increasing, how is acetone increasing its mole fraction in both phases? If the mole fraction of acetone increases in one phase...

Hi, My name is Stuart and I am an undergraduate student at the University of Strathclyde, UK. I'm just about to start my 3rd year but I was lucky enough to successfully set up a summer project for during the summer where I am working in the Centre for Biophotonics. I've been a member here...

As the post title describes, I have two data sets and want to multiply them together (and finally plot them). The problem I have is that the data are different length, so for example using Matlab: >>> data_set1 .* data_set2 But this would not give me the correct answer for a number of...

I'm having trouble finding the correct approach to my (fairly simple) example. Let's say I have months of data for log-in times of a certain website. The data has been selected and cleaned such that I have a list of Date_Time for each log-in. Now, suppose I wanted to predict the log-ins...

. I have a large Excel worksheet (200 columns, 4,000 rows). Every column has a unique and carefully chosen title/label. I'm attempting to use it within Mathematica to create a large number of contour plots (1,000) -- using three columns at a time, for x, y, z. The import, I suppose...

Can someone please explain the frequency response of sampled data system. Why is there a spectrum at 0, Fs, 2Fs, 3Fs. (Fs - nyquist sampling frequency). Shouldn't it be just from zero to Fs/2 ? See fig. 2a in this link - http://www.maxim-ic.com/app-notes/index.mvp/id/928