The tag has no wiki summary.

learn more… | top users | synonyms

-1
votes
1answer
76 views

audio signal arithmetic

BACKGROUND: I have been messing around with audio signals in Audacity and realized that by inverting a signal and adding it to the same signal I get no signal. Thus (S + invS) is really (S-S). (S+S) = ...
2
votes
0answers
58 views

Does Celestia take the lunar orbit precession into account?

Does the lunar orbit plane rotate (8 year period precession)? Does Celestia take this into account while drawing the moon orbit?
3
votes
1answer
35 views

Code to sample from & integrate light of a cluster?

Are there any publicly available codes to sample from an initial mass function (common ones... Kroupa, Chabrier, Salpeter) to construct a cluster, then use stellar models to generate an integrated ...
5
votes
4answers
369 views

What free software is there for observing the sky (sky map software)

I used until now only stellarium.org and I'm curious if there is any other software that is better than stellarium. By better, I mean: doesn't have high system ...
4
votes
1answer
184 views

How to identify the objects in an astrophoto, and what portion of the sky it covers?

Given an astrophoto with a resolution between 0.5 and 5 arcseconds per pixel, which ways exist to identify the direction of view, field of view, and objects in the picture? I believe most amateur ...
1
vote
2answers
269 views

How can one determine at which distance the Lennard-Jones potential reaches a given value?

My question is fairly simple, but I do need clarification on how to get the inverse of the Lennard-Jones potential V(x). I am working with the following expression: $$ V(x) = e\times[(R/x)^{12} ...
4
votes
2answers
1k views

How to calculate linar velocity of planet orbit?

I try to simulate a solar system with planets (with random mass) placed randomly around a sun with a mass $X \times \text{solar mass}$. The simulation is going well when I use real data ...
0
votes
1answer
592 views

End position of movement factoring in deceleration

Ok I am hoping to apply this answer to a piece of software, but it uses physics to work out the result so I require some help in that department. I will attempt to explain this the best I can. I ...
0
votes
2answers
193 views

Planet's Moon attrated by sun [closed]

I'm currently writing a code to generate solar system and $N$ number of planets / moons. I use real data to test (earth / sun / moon data). I succeeded in placing the earth and make it orbit around ...
5
votes
5answers
757 views

Computing Planetary Positions

Shortly, I will be beginning my third year at University in Computer Science, I am a software developer and I will be required to work on a final year project. My idea for my final year project is ...
8
votes
10answers
151 views

Are there websites or programmes that permit a simulation of the night sky in the past and the future on an ordinary computer?

Are there websites or programs that permit a simulation of the night sky in the past and the future on an ordinary computer? (For the past, I would be content with objects visible to the naked eye.) ...
1
vote
3answers
1k views

Statics software for structural engineering [closed]

I'm attempting to expand my knowledge of engineering software. I've found comsol and ansys for acoustics and thermodynamics/fluid dynamics (not necessarily in that order), now I'd like to see if I can ...
5
votes
3answers
79 views

How to get started in Astronomy (UK based) [closed]

I have always been interested in space and astronomy (in my youth - I wanted to be an astronaut). However for various reasons, I never quite got started. I now want to get started - small but ...
2
votes
1answer
13 views

What is the current evaluation of a sky map application for mobile devices?

Which sky map application for mobile devices have the best "feature satisfaction"-to-investment ratio? I would like to have a comparison between "sky map" applications for mobile devices and it ...
3
votes
1answer
84 views

What is the format for “local catalog” files used by JSkyCat?

I am trying to use JSkyCat to mark a set of coordinates on a FITS image, and have found the dialog for choosing a catalog file to load. However, I am having trouble finding any documentation on what ...
7
votes
1answer
67 views

When taking a sequence of exposures for stacking/coaddition, what dither patterns are most commonly desired? Why?

When taking a sequence of exposures for stacking/coaddition, what dither patterns are most commonly desired? When visiting a telescope, what default dither patterns would a visiting astronomer like to ...
8
votes
3answers
1k views

Is there a nice tool to plot graphs of paper citations? [closed]

I would like a tool which allows me to enter some paper citation, and then will begin drawing a graph, where each paper is linked to other papers that cite the original paper or are cited by it. It ...
0
votes
1answer
302 views

Software to simulate dynamics of objects in a given gravitation field [closed]

I want to simulate and test set of 2D designs that basically have pulley/gear/chain-linked systems under Gravity (For e.g. to check how a pulley would rotate given particular weights, of course I'm ...
4
votes
1answer
1k views

Stellar evolution simulation engine or software

Is there any general purpose stellar evolution simulation engine or software? Something to throw in properties of the star and to watch how (and why) they change along the timeline - with or without ...
1
vote
3answers
340 views

Software for Creating Custom Star Charts?

I need to produce custom star charts for my website. I want to be able to do the following: Specify a region, maybe a constellation or just an arbitrary region Specify what appears on the chart ...
1
vote
0answers
78 views

Toolbox for Complex Networks and Graphs

Is there a toolbox which helps in visual simulation and modeling of a network (say a mesh or ring) consisting of coupled synchronized system of nonlinear equations(ODE) which represent a system of ...
-1
votes
1answer
129 views

Simulating a car in an intersection

I'm somewhat confused. I want to simulate in real-time an intersection where cars have to turn left, right or go straight. What I have are 2 way points: One at the beginning of the intersection on ...
1
vote
0answers
75 views

Good Magnetic Simulation Software? [duplicate]

Possible Duplicate: Where can I find simulation software for electricity and magnets? I am looking for a good, FREE software that allows me to play with magnets, coils, generators, the ...
0
votes
0answers
31 views

Software for simulating the motion of a test particle in a force field [duplicate]

Possible Duplicate: Software for simulating 3D Newtonian dynamics of simple geometric objects (with force fields) Is there any software for linux, which can simulate the motion of a test ...
0
votes
1answer
80 views

Modeling falling spheres

The following situation interests me and I was wondering if there is software to model it? A large set of n spheres of uniform density and discrete sizes, mass proportional to volume, are dropped ...
1
vote
0answers
271 views

Algorithmic approach for applying Kirchhoff's Rules to circuit analysis

Working with Kirchhoff's rules, I am attempting to device an algorithmic approach to finding the unknowns of the problems, I am of a Computer Science background and I am finding it difficult to ...
2
votes
1answer
92 views

Program for radiation and toxic hazards

I worked in my masters thesis with $^{87}Rb$ and $^{40}K$, really small beta emitters. But there are so many other things around in the lab, that I want to keep track on all the things I might get in ...
10
votes
3answers
1k views

How to convert a FITS file to .xls Excel file?

We are trying to determine the isophots in elliptical galaxies in order to check De-Vaucouleurs law. To do so, we want to convert the data from a FITS file to Excel and analyze it using Excel math ...
3
votes
0answers
159 views

How can one activate the decay of the quark b with PYTHIA event generator?

This is my problem and I hope finding a solution. _In the simplest alternative, MSTJ(22) = 2, the comparison is based on the average lifetime, or rather (c*tau "time life") , measured in mm. Thus ...
1
vote
1answer
3k views

Where can I find open-source weather forecast software? [closed]

Are there any software packages/frameworks for running weather forecast numeric models on a single PC? I've found at least two instances, but I'm interested to know whether there are more and where I ...
2
votes
1answer
89 views

Sky projections in sky view software

I'm playing with an idea of making a little program to draw the sky. Nothing fancy, just for fun. And I'm reading about projections. Now I know that I must use different projections depending on my ...
12
votes
5answers
646 views

Online physics collaboration tools

I.e. online discussion with your friends. A forum is probably too overkill in this case. Yet so far nothing can beat direct communication. Important feature: the ability to archive discussions. We ...
1
vote
3answers
505 views

Numerical simulation of mechanics problem

Say I have a planet and shoot something with a given velocity, which is a significant portion of the escape velocity, in a given angle into the sky. It has some initial velocity and there is the force ...
2
votes
1answer
733 views

How can I subtract Spectra?

I am writing an application that should allow to view and manipulate spectra (Raman). I am only given one normal spectrum consisting of 1024 coordinate points. Plus I have a background spectrum that ...
2
votes
3answers
85 views

Statistics software for basic undergrad lab

I'll have to perform some simple experiments, like measuring the period and damping of a pendulum, focal length of a lens, … As a result I will end up with some X, Y data points and need to calculate ...
2
votes
1answer
372 views

Symbolic tool for doing 2nd quantization operator calculations

I think everyone who has attended a lecture introducing second quantization appreciates what a pain it can be to compute expressions involving commutators or anticommutators with lots of operators. ...
5
votes
1answer
291 views

Matlab package: graphical calculus for quantum operations (esp. linear optics)

I need a matlab package that will make my life easier. I have quantum circuits with optical beam splitters, polarizing beam splitters and photodetectors. These circuits are getting very complicated ...
1
vote
0answers
118 views

Matlab package: graphical calculus for quantum operations including beam splitters and polarizing beam splitters [duplicate]

I need a matlab package that will make my life easier. I have quantum circuits with optical beam splitters, polarizing beam splitters and photodetectors. These circuits are getting very complicated ...
13
votes
2answers
298 views

Searching books and papers with equations

Sometimes I may come up with an equation in mind, so I want to search for the related material. It may be the case that I learn it before but forget the name, or, there is no name for the equation ...
3
votes
2answers
2k views

Software to simulate and visualize atoms?

Not sure if this is a physics or chemistry question. But if the motion of atoms and it's particles can be described by quantum mechanics, then is there a software that simulate full atoms and it's ...
0
votes
1answer
505 views

Physics simulation software to perform this very specific experiment

I need a physics simulation software that allows me to perform the following experiment: 1. Create a frictionless ramp/terrain defined by a parametric function; 2. Create a ball in an arbitrary ...
1
vote
2answers
188 views

Intensity loss due to vignetting

I was trying to get an expression for the loss of intensity due to vignetting in a simple optical system, and got a fairly complex integral. I was wondering if there's an easier way, or any book that ...
1
vote
0answers
213 views

Is there any know weakness with GNUplot fits? (especially with gauss) [closed]

my faculty push pretty hard on us using GNUplot but it gives me somewhat unconvincing results while attempting to fit a gauss-like function. Is there any known weakness with GNUplot fits or should I ...
3
votes
3answers
543 views

Numerical software to manipulate a light beam in its plane wave representation?

Any light field can be expressed as a sum of plane waves. Such an ensemble of plane waves is called the plane wave spectrum of the light field. The plane wave spectrum is the Fourier transform of the ...
2
votes
0answers
115 views

Spin 1/2 finite-difference field simulator?

Is there a finite-difference field simulator for spin 1/2 fields, something like meep for electromagnetism (spin 1)? Looking for something free (GNU, MIT or other open/free style license) and easy ...
7
votes
1answer
170 views

Spectral energy distribution fitting tools or routines [closed]

I have observed magnitudes and fluxes for an object in different wavelengths from optical to mm. Now I need a tool, routine or something like that to fit a spectral energy distribution (SED) and ...
2
votes
2answers
451 views

Software for simulating 3D Newtonian dynamics of simple geometric objects (with force fields)

I'm looking for something short of a molecular dynamics package, where I can build up simple geometric shapes with flexible linkages/etc and simulate the consequences of electrostatic repulsion ...
2
votes
1answer
499 views

IRIS alternative on mac?

I need to process some images taken from a telescope to determine the intensity of an astroid. This way I can determine the rotation period of this asteroid. The pictures were taken the usual way ...
8
votes
1answer
2k views

What programming languages would be helpful for a physicist to know? [closed]

From the vantage point of a physicist and the kind of problems he would like a computer program to solve, what are the essential programming languages that a physicist should know. I know C++ and I ...
5
votes
3answers
358 views

Supergravity calculation using computer algebra system in early days

I was having a look at the original paper on supergravity by Ferrara, Freedman and van Nieuwenhuizen available here. The abstract has an interesting line saying that Added note: This term has now ...