Data Definition and 998 Threads

Dear all, I am trying to solve a question, and I think that something is missing. It is given that the vectors u and v are solutions to the non-homogeneous system of equations Ax=b. If the vector ku-3v is a solution to the same system, then: a) k = 4 b) k = 3 c) k = 0 The correct solution...

Hi. At first,I am sorry that my English is so bad. I've just installed Healpix on cxx(c++), and I'm starting to leraning. then I made txt file containing binary data(RING pixel and corresponding to data like temperture),and I want to make Healpix RING map of the data. but I don't know which...

I am curious about production amounts and prices for an annual period, for a few thousand commodity or common chemicals. I noticed a couple chemical intelligence services but they seem out of the price range for an amateur researcher. What kinds of sources are available to look further?

Hello everyone,I am trying to acquire the data used to make solar images like in this link. For various wavelengths, but mainly for visible. And, honestly I am having a problem finding the data. I am assuming that these images are made using a set of data for each, am I wrong? I don't have a...

The enthalpy of formation equation: ΔHƒ°reaction=∑Δhƒ°(products)-ΣΔHƒ°(reactants) When using the enthalpy of formation equation you get: -2010-((-394x3)+(-286x4))= 316Kjmol-1 However, this answer is wrong. On the mark scheme, the answer is -316Kjmol-1. So I used the enthalpy of combustion...

Hello, I am a Belgian master in physics and astronomy with a couple of years of working experience under his belt, who recently decided to obtain a second master in statistics. Normally I should graduate in 2020. My goal is to become a data scientist, but preferably within a scientific context...

When and how can the gravitational wave be used for data communication, which the speed be much faster than the current technology by means of electromagnetic wave like 5G, 6G..etc wireless systems ?

I've built an offline chatbot AI, you basically give it a conversation and it learns from it, such as how to respond to certain questions or statements. So far I've just been having conversations with myself and used that as training data. Is there free training data out there similar to...

I studied an elementary course as an introduction to Solid State Physics. Now I have powder XRD data to practice crystal structure determination. I am going to do this alone in my computer. I want to know what software to use (free software) with manual of course. Any help please?

Greg Bernhardt submitted a new blog post Intro to Data Structures for Programming Continue reading the Original Blog Post.

Hi people, I am looking for a database where I can get raw data to plot the Bragg's curve for alpha particles energy loss vs range in Silicon, Germanium and CZT. Your help will be much appreciated. Cheers, Shri

Homework Statement Two mechanisms are proposed (as seen in the screenshot). Which mechanism and which step as the rate determining step would best fit the data? Homework Equations I think this is more of a conceptual problem ... The Attempt at a Solution I apologise for not strictly...

Hello, I've been splicing a HDMI cable which has 19 wires in total I've soldered all the data cables apart from the 5 shielding wires. I'm a little confused because as far as I know the wire shielding is meant to act as a faraday cadge to stop interference. But when I don't connect the shielding...

Hello, I want to ask about this picture. This is a one bit of plasma spectrum from copper plate. Does anyone know what those romanic numbers (I, II, III) mean or what those numbers in [ ] mean? Also why am I seeing multiple element names on a single peak? I am so confused... P.S. The x-axis is...

Hello, I'm trying to send binary data over the power lines to a microcontroller, which triggers a relay turning on a light. I was wondering what kind of device would I need to use to achieve this? And how would I connect it up to the microcontroller? I'm fairly new to this, so if someone could...

Hello, I've got two computers that are in separate rooms and I have placed plastic conduit through the small space above the ceiling. Which will have a USB data cable, an Ethernet network cable, and a HDMI cable inside. The conduit length is about 8m long. And I was wondering if this setup could...

I have a data set of samples, and I made up some variables that filter out unwanted samples from the data set. Say each sample has values ##\vec{x}=x_1, x_2,..., x_n##, and I know the values of ##\vec{x}## for each sample. Also, if I sum up all of the samples, I get a value, ##Z##, which tells...

I got something i want to do for fun and help out a...person i know but i never finished high school so that's my degree level. i was wondering if there is a way under $100 to possibly use my internet or posibly 2 peoples internet connections on the other side of the town i live in, split up the...

Homework Statement I'm using a textbook called "Introductory Statistics with R" by Dalgaard, and I am having trouble doing one of the problems. It asks me to isolate names from a data set called "juul". But the problem is that I am unable to locate said data set. Homework Equations Functions...

Im wondering does anyone know roughly how many galaxies we have red shift data for, just a ball park. Is it hundreds? thousands? millions?

I have a set of values and I'm trying to come up with functions to fit that data. Here is what I know about the data: It is rounded down / floored to the nearest significant digit (i.e. 1 for v1 and v3, 0.1 for v2). Columns v1 and v3 look linear (e.g. first order polynomial). Column v2 looks...

Question Has the LHC released any papers or reports on the observed running of any of the three Standard Model coupling constants with energy scale from either Run-1 or Run-2 data (or both data sets)? Last time I looked I couldn't find any data As of January 2014, I had not locate any papers...

Hey guys, I am looking for a database on gamma emission from the first few excited states of known isotopes for a piece of software we are putting together. Any format is fine. Thanks!

I make confusions in the using of Maximum Likelihood to find (approximately) the original signal knowing the data observed and the using of Maximum Likelihood to find estimations of parameters of the PSF 1) Find (up to some point) the original signal : I start from this general definition (in...

Homework Statement Serway Physics Section 2.4 Acceleration (a) Use the data in Problem 5 to construct a smooth graph of position versus time. (b) By constructing tangents to the x(t) curve, find the instantaneous velocity of the car at several instants. (c) Plot the instantaneous velocity...

I am writing some automatic differentiation routines for Taylor series, and would like to verify my results for the value and first six derivatives of ##sinh## and ##cosh## evaluated at ##\pi /3##, and also ##tanh##, and ##sec^2##, evaluated at ##\pi / 4##. I have attempted to use this site to...

https://www.vox.com/science-and-health/2018/10/12/17957268/science-ancestry-dna-privacy

I think it would be great if cars software could historize data such as speed, using turn signals, etc which can be used in court to prove/disprove if someone was in fact speeding or didn’t use their turn signal. Why haven’t companies moved this way yet?

I have a dataframe that looks as attached. What I aiming to do is to plot the lines for each type where if it is for type A, I want to be able to have two lines in the graph that shows the trend for type A. I was not able to find any examples online especially with the format of the data in this...

Hi all, I have few measurements of a tillage machine running two types of soil engaging tools in terms of geometry (named A and B, respectively). I have measured the draft for running the machine and the speed. My aim is to analyse how much is the difference of the two tools in terms of force...

I tried a search for this first and had negative results so I thought it might be helpful. Google has launched a new https://www.techsupportalert.com/content/google-launches-new-dataset-search-engine.htm feature that enables laypersons to retrieve highly specific results from millions of...

Hello! The attached pic is from this paper. So on the y you have counts and on the x you have a certain parameter used to search for a certain resonance. The colored part is the Standard Model (SM) prediction and the black dots are the obtained data while the dashed lines are the simulated...

Hello everyone. I'm currently working on NS mass relations and trying to plot a curve with predicted masses-radii and observations on NS. There are some free data at this website: http://xtreme.as.arizona.edu/NeutronStars/index.php/neutron-star-radii/ . I downloaded the .tar file and tried to...

Hello I'm working on project called"design & implementation of EMG data acquisition",after I search on these systems i really confused about what the gain and the filter type that i have to use. at the first stage i use instrumentation amplifier to amplify the signal, so how much the gain of...

Not sure this is the right area to post this. Let's say I have particles on a lattice, and they all have some property (ie, color) that is correlated at some known correlation length. I want to simulate this! In 1D I could do something like have color be a random walk in the given dimension...

Good morning, I used the Laser beam with HR4000 spectrometer with Ocean View software when saving the files it is saved by (.ocv) format. when trying to extract information to excel I get some unreadable data like (bkg thin sheet gel.png) attached. I used the same instrument and software with...

Hi All, Trying to get basics of inputting data into SAS ( University Version, i.e. in remote Virtual Directory in SAS Studio . I hope my layout , nor my general writing are too confusing. Feel free to suggest a different format): Please critique: We want to read file 'FileName' into SAS for some...

this graph: http://www.pnas.org/content/pnas/112/11/3173/F1.large.jpg?width=800&height=600&carousel=1 from: http://www.pnas.org/content/112/11/3173 can be found on many sites. the origin is D=0 and t=0. cosmology claims the universe is accelerating over time. the graph shows acceleration over...

I have some experimental data, and I would like to plot a graph in MATLAB and also find the best fit line. I also want to find the distance between each point and the best fit line, and if the distance is greater than 1 unit, an error will be shown. For this, I have written a function. Here it...

Hi, Where would I find data for rotational/vibrational temperatures for a particular molecule (ethane)? I tried googling but had no luck. Also can you compute the moments of inerta for a particular (simple) molecule?

Some background, I have a Masters in Statistics and Bachelors in Applied Mathematics so It's not like I'm starting from scratch. But after graduation, I've been involved in education. I'm about one year out. I suppose this would hurt me in breaking in the field. I've interviewed at a few...

I've recently started my new RA position, and I've been given the task of analyzing a root data file. I'm not completely lost, but I don't exactly know what I'm doing. The point of my post is not to ask for answers, merely advice. A place I could go for info on data analytics. Pointers on how to...

Can anyone recommend papers that directly curve-fit redshift as a function of luminosity distance for type Ia supernova and gamma ray bursts? I am looking for papers that do not curve-fit the data via an assumed model, even one as simple as Friedmann–Lemaître–Robertson–Walker (FLRW) metric. I...

I'm trying to find a good database of absorption or reflection spectra in visible light for pigments. I've found a wonderful database in this article: http://e-conservation.org/issue-2/36-FORS-spectral-database#CSV It's almost exactly what I needed Except I don't understand the data The...

What do you think the future of data science would be, given the increasing privacy concern of collecting and sharing users data?

Hello, After more than 18 months of applying for jobs in my field (Ph.D. in Electrical Engineering/Wireless Communication) and in others (e.g., Data Science), in my country of origin, the country of graduation and residency (Canada), and other countries, I still haven't been called for any...

Hi everyone, thank you for reading my thread I know the question is weird but I can't seem to explain it otherwise. My problem: Basically I am finishing a final year project which I based on a Formula Student Vehicle. Using CAD I have the vehicle modeled, and through the model analysis and with...

Hello everyone! I'm working on a simple app for a project at the university and I'm having problems accessing the SQLite data in RecyclerView. I suspect that the problem lays in a connection with an activity that includes the RecyclerView and the RecyclerView adapter itself. My project, in the...

I was hoping this c++ file could be adapted to use as data compression or encryption #include <iostream> #include <cmath> using namespace std; double asil(double t) { cout<<"asil\n"; cout<< cos(t) << endl; double two = 2.0; cout<< sin(sqrt(two)*t) << endl; return sin(sqrt(two)*t); } int...

I am woundering if there are any toxicologists on this forum so I could ask some questions (If they don't mind). For example, what data do you record on a day-to-day basis, how is it recorded and how it is made traceable. I have a rough idea, however I am not certain as I can't find anything on...