Data Definition and 998 Threads

I have Bathymetry data which gives the depth-area-volume relationship of a lake. I have determined the area-volume relationship using the function Area=A*Vol^B. Now I'm not sure how to determine the similar relationship between depth and volume. Can I use the same function i.e. Depth=A*Vol^B? I...

Dear All, Please, I am trying to read in a data shown in array form but no luck. The data is 10 by 10 with each 10 by 10 depicted by a local array, for e.g. 0 0 0 0 0 0. A sample of the code I tried using is as shown below and the data is as attached. Please, any help or suggestion will be...

Hi all, I am designing an NFC device but am still a little unsure about the principles behind NFC/RFID. From what I understand: A primary coil constantly emits a 'carrier frequency' magnetic field. This field induces an e.m.f. on a passive secondary coil which is in a secondary circuit. The...

Another paper in Friday's physics arXiv on using the H(z) v z plot to investigate any possible evolution of DE: Utility of observational Hubble parameter data on dark energy evolution. From that eprint: As discussed in the Marginal evidence for cosmic acceleration from Type Ia SNe, this paper...

According to rules for working with approximate data, why the final result of a multiplication or division involving approximation data is round off so that the result has as many significant digits as the given data with the fewest significant digits? How is this rule established? For example...

Hello, I have a three phase brushless motor and was trying to measure its torque and speed using a torque sensor. The motor will first go to its maximum speed which is about 6000RPM, then I applied a brake to decrease its velocity. Here is what I get as a result of data acquisition : The...

Hi all, Hopefully this is the right subforum. I have a question related to Arduino sensors. Q:Generally, when do you need to be worried about losing data from having long wires from your sensor to your Arduino board? Details:For example, I've been looking at two sensors. Sensor 1: MLX90614...

Hey everyone, I'm hoping I can get some input on this. As some of you may recall, I'm currently in an internship at Fermilab, and I've hit a snag in plotting my data. I'm measuring the intensity of the NuMI neutrino beam at multiple different points to look for discrepancies in the measured...

I have an optimization algorithm running 50 full trials with up to 10,000 iterations each (it breaks off if the error goal is reached before that). I want to export the iteration number and the best function value at each iteration to an excel file, then after each trial completes move to the...

Thank you for taking the time to stop by this thread. I am in a Computer Science Engineering course and have just finished my first year. I don't think the first year was very fulfilling in terms of quench in my thirst for knowledge. But that's alright because it was largely unrelated to my...

Homework Statement Decay of Carbon-11 from given data of count rate at time 0 to count rate at time 14 minutes in 2 minute intervals. Homework Equations I feel like I've gone wrong here because the answer I get of 19.6 minutes is actually negative if I go back and do the last equation again. I...

Does anyone know where I can find some material (for free) on IDL? I'm new to programming, and I would like to teach myself this language. I would like suggestions to material that is "novice" friendly.

I have been trying to read in a data using Fortran but for some reasons, it doesn't read the data correctly. Please, any help will be appreciated. To read the data, I used the following (Note, for the attached data, Nm=1, nw-nu=5, nw=10). The array data(i,j,m,n) is declared as...

Hi, I'm trying to get how well a known function fits to a set of data. I'm not interested in the data's line of best fit or anything, I just want to know how close it is to my model. I've tried using curve_fit and linregress but neither really give me what I'm after. My data follows a...

Here's an article by a woman who obtained a radiation monitor and noted it's readings at various places she went: http://www.ratical.org/radiation/radMonData.html I have a question about this passage: Why would this clock be so radioactive? I am also baffled by this revelation: Why is it...

What other ways other than a typical contour map and a line graph, are there to graphically present elevation data from a levelling run etc? Any help would be great appreciated. Thank you.

Homework Statement clear all; close all; totalanswers=zeros(100,4); k= ; flag =0; for i =0:25 a=i; if flag ==1 break; end and so forth for a,b,c,d, etc for a finite set of values all have the break values too. x=[ a,b,c,d]; does some math calculationhere is a...

So I have downloaded the connectome of c.elegans for my own amusement; I have a few very simple neural models I want to implement. However they require some knowledge of the boundary conditions, i.e. given that a touch or temperature sensor on c.elegans has certain inputs, what is the incoming...

So you start with electromagnetic radiation(Maxwell) and magically send 'data' over the atmosphere to a receiving device. EM radiation consists of photons, not electrons(I think), and the only way to detect a photon is through the photo-electric effect. I also have heard of frequency...

Homework Statement We've got a random variable that appears to have no trend/seasonality, is stationary, and we want to forecast it. The variable is number of warranty claims received each day, 53 days, so we've got 53 values, and we want to forecast the values of the upcoming 5 days. 2. The...

Hello, I work in a liquid calibration Lab and we are applying for ISO 17025. Basically we verify customers flow meters against our standard and capture the data onto our calibration report. An example is I would perform 4 tests of a specific flow rate and calculate the error in % for each test...

I have performed an experiment testing how mechanical energy is conserved. I conducted this experiment by first creating a ramp. I gathered data by first calculating the gravitational potential energy of a marble on various points on the ramp (depending on height). Next I rolled the ball down...

Hello everyone, I need some continuous-energy neutron cross sections libraries in ACE format for MCNP5 (endf66a, endf66b, endf66c, misc5xs) as well as the continuous-energy photon tables (mcplib, mcplib02, mcplib03, mcplib04). Here: http://www.oecd-nea.org/janisweb/search/endf , we have...

Homework Statement Data from the short-circuit test of a 60-Hz, 100-kVA, 4600–230-V transformer are: VSC = 172.3 V ISC = 20.2 A PSC = 1046 W Get the per-unit parameters. 2. Relevant equations [FONT=Georgia]ISC ≠ Irated, so how will I solve the problem? The problem is from the book with...

I'm working on a school project (Plant layout). In the project, I'm in the planning phase of a new product and I need to have some standard data for motion time study (i.e. assembling) to determine equipment, space and people needed in the plant. Where can I find such data?

I am doing a project about the SEIR model, which is an epidemic model consisting of 5 ODEs, that classifies people according to 5 categories: S: Susceptible E: Exposed I: Infected R: Recovered I am looking into CDC's website and would like to take Flu as an example. My medical knowledge is...

I have several questions about the process of determining the value of cosmological parameters by LMS fitting tunctions of the form z = f(DL) (where DL is the luminosity distance to astronomical data points), for example, as shown in the following diagram: The five cosmological parameters I am...

I have performed an impact test on different football shin guards to assess their performance. I am however confused with the readings measured by the accelerometer I have used. The sensor was attached to a striking mass of 4.3 kg which was dropped at different heights. The graph I have attached...

How do i check for correlation or test for association between a continuous data and nominal data in SPSS? My nominal data is the "type of GPS receiver" and the continuous data is "latency" in seconds.

I am looking for tabular view of all isotopes (*.xls, *.csv, *.ods , ... ). Preferably with as much information as possible - half life, mean life, decay constant, specific activity, ... Any thoughts on where this might exist. I am wondering about correlations between stability and different...

Hi, I have got a rather large data set and no matter how hard i look i can't find any equations to convert the data back to STC, i have both AC and DC power, all the currents and voltages and all the data sheets for the equipment. if someone could please help me find an equation to help it...

I'll soon start to take some data (i.e. making measurements) and from the little I've seen from a physicist doing research, I believe he trashes some data. In other words he doesn't publish all the data he extracts from the laboratory. He applies some non rigorous/mathematical criterion to the...

Hi, say I am doing a query for which I need data from two tables, on, say the salary of those who teach French from 2-to-3 P.M, and one table T_1 contains the teaching subject and another table T_2 contains the class schedule/hours. Say these two tables are related. Do we then do a query...

Homework Statement Determine the mass of Jupiter using the data for the moon Io. Mass of Io: ##8.9*10^{22}## Period: ##1.77## Earth days Mean distance from Jupiter in km: ##422*10^3## Homework Equations Centripetal acceleration ##a = \frac{v^2}{R} ## Universal law: ##\frac{GMm}{R^2} ## The...

I need to obtain refractive index vs wavelength data for the following materials: GaSb (Gallium Antimonide) InSb (Indium Antimonide) For the range from 2μm up to ideally 20μm but up to 10μm would do. Looking on the two websites I know of for sourcing such data...

I should have studies statistics in school. I have been collecting some trip data from you commute to and from work, and I want to determine what factors are influencing trip duration. There are multiple factors, which I cannot easily isolate. The factors I'm most interested in are: - duration...

Homework Statement I'm supposed to find the first ionization energy of a gas (Argon), and to do that I used mass spectrometer. The data I plotted was amplifier voltage (acts as Ion current) vs. electron volts. The graph appears in the attachment as data2.jpeg. To find the ionization energy I'm...

Hi Everyone, I need to organize a bunch of raw data into bins and their frequency. The data is quite large (about 60000 entries). However I am having a lot of trouble with the right commands. I used the Wolfram documentation center but I still keep getting error messages...

Dear all, I have more than 1500 matrices that are the occurency frequency of a bivariate dataset, something like the following: [0.1, 0.3,0.1;0.4,0.05,0.05]. I need to extract the few of them that are really different from the others. Instead of visually analyze each of them and trying to...

Hi, Can anyone please help me in convoluting atomic data. Along x-axis I have wavelenght and on Y axis I have scattered intensity. I want to convolute with FWHM of 20mm. Thanks Kartik

Hi, does anyone help me please to convolute atomic data. On x-axis I have wavelength and on Y axis scattered intensity data. Thanks Kartik

Hi, is there any way to let my C++ program calculate some data and return them as results into a txt file? For example let's say I want to make a txt with the following things inside: Is it possible to write in C a program of the form: and let it somehow extract each k[j] into the text?

Hi, I have a data vector that consists of directions measured in an experiment. I wish to create a probability density function. As the data is circular and multimodal I use a kernel density estimate with von Mises distribution (essentially a Gaussian on the unit circle) as the basis function. I...

Hello all! I'm hoping you will be able to direct me to sources of raw income1 / employment data. Hopefully this thread can be a help to others who have similar needs in the future, as well. (I did a quick search for a similar thread and didn't find anything - please correct me if I'm wrong.)...

I have a question about the logistic fit they used on this paper: http://online.liebertpub.com/doi/pdf/10.1089/cmb.2005.12.1047. Its PDF page 5, or journal page 1051. They define all the variables and then say x0 and b define the shape of the model. If I am fitting 30 cycles of PCR data how am I...

Hello, I am a new member. I have some question concerning data acquisition on a torque sensor and I hope someone can help me out. I have a torque sensor that I use to mesure the torque and speed of a motor. The torque sensor outputs an analog signal of +/-5V (torque) and two digital signals...

hello everybody... how to easy find mean with multiple data with simple formula [shortcut formula]? please, see my picture.. thanks in advance... susanto3311

Hey, sorry if this is not the right section to post in, the topic is a bit ambiguous. I've generated a set of coordinate points for the orbit of Mercury (3d cartesian) and now I want to fit an ellipse through it so I can get an accurate estimate of the location of the perihelion. I am using...

Hi everyone! I am trying to make a presentation concerning up to date internal combustion engines for different applications (light duty/passenger cars, heavy duty, marine/low rpm, aviation etc). I don't need any charts just sheer numbers of power, capacity, weight, engine dimensions...

Not sure if this is the right forum, but I'l give it a shot. This question regards reliable data transfer in the context of transport-layer protocols in communication networks. Let's say a sender sends a packet of information over a channel. The packet is corrupted, and the receiver replies with...