Simulation Definition and 899 Threads

hi all, I return to post after about a year. one of the acknowledged loopholes in the bell experiments is how the coincidence circuitry behaves under what might be called "simultaneous H/V measurements" where H/V represent horizontal/vertical polarized photons at one arm. basically, if you...

current issue of SCIENCE http://www.sciencemag.org/cgi/content/short/313/5792/1413 Exotic Earths: Forming Habitable Worlds with Giant Planet Migration Sean N. Raymond, Avi M. Mandell, Steinn Sigurdsson "Close-in giant planets (e.g., "hot Jupiters") are thought to form far from their...

Hi, I'm trying to solve an electrowetting problem, by using the finite element Galerkin method. The problem is to find simultaneously the shape of the liquid drop and the distribution of potential in electrode and air. I've calculated the residuals for the potential u (Ru), in both air (Ru2)...

May as well announce my Java applet that simulates Newton's law of gravitation. The initial conditions are set to give a demonstration of conservation of angular momentum. That is, 8 test masses are launched, all with the same angular momentum, and their orbits cross on the other side of the...

I am trying to define the sensitivity of a piezoresistance as a function of temperature using PARAMETERS. The equation is: {S=S0(1-TCS(temp-25))}. The problem is that "temp" doesn't change during a Temperature Sweep, but I don't have any error either. Could you help me?

http://www.nasa.gov/vision/universe/starsgalaxies/gwave.html

Came upon the following article: http://www.simulation-argument.com/simulation.html Granted, there are some other approaches to the these metaphysical questions (string theory for instance) but... will it actually reveal the meaning of life or maybe finally discover GOD or refute his...

Hi! I'm about to start an acoustic analysis of the local shooting range. The range is (as every other range in sweden) about to be forced to shut down since it's not PC to practice shooting in sweden. However, the official reason is that the sound pollution is to great. Im interested...

(unrelated to my other post about an asteroid) 1] I would like to check a postulation with someone who has an orbital simulator, or a good head for orbital mechanics. Given an object such as a comet with orbital period of about 150 years, could it have a perihelion at a distance between...

If we understand the possible origin of life very well, we could model it on a supercomputer using known physical laws. Physical laws can be used to trace a pathway forwards and backwards in time as astronomers do when predicting the motions of the planets, or tracing back previous postions...

We had a project in PHYC 2050 to write an applet simulating a scientific model. Me and my partner chose the solar system, which was a step up from the other projects (ideal gas law, refraction :biggrin: ). We took into account inter-planetary actions and used a simple "assume force is contant...

I have a simple question about AC/DC. I expected a circuit with a given DC voltage to be equivalent to one with an AC voltage whose value (peak-to-peak) is the same (at least theoretically). For 10 V DC, I get a load voltage of 1.6667 V, whereas 10 Vp-p AC gives 1.6602 V (simulation). Are there...

I'm currently learning spice. I need help with a very simple circuit. http://www.ibiblio.org/obp/electricCircuits/Ref/01004.png Here is the netlist: Example netlist v1 1 0 dc 15 r1 1 0 2.2k r2 1 2 3.3k r3 2 0 150 .end When I run it in spice(2g6) I get: ******* 12/04/10 ******** SPICE...

I'm playing matchmaker again. A guy on another board (ADP) is doing research for a story about a near-miss asteroid and he wants to get his physics right. I am strongly suggesting he do a proper simulation so he's got his numbers straight. Would anyone with the right software be willing to...

I'm building a spacecraft attitude control simulation and I'm looking for some references to help me build a realistic mathematical model. Could someone please help me? I'm testing an AI library I built and that is requiring a lot of research in itself. Thanks for your time! Jeff

I'm looking pneumatic/hydraulic simulation software. Anyone know any good ones? It would be nice if they had a trail version also. --thank you.

I am disappointed and a little alarmed to find big discrepancies between simulator software. Following advice from https://www.physicsforums.com/showthread.php?t=84458", I tried simulating the same date: May 5 1975 with three simulators: http://www.fourmilab.ch/cgi-bin/uncgi/Solar"...

Hello, My first post and it's going to be a question =) I hope I can get some replies. Here we go :- I'm constructing a simulation of a motorcycle with rider and I have encountered a problem with oscillation (lack of stability) that I just can't find a solution for. Basically the bike will...

I'm modelling an induction machine used as a fast-response drive that provides on-demand additional power to a manually operated lever. My problem is I have no fixed operating point, the motor operates at high speeds but only for a maximum of 10 seconds at a time. I'm also modelling this out of...

This is the value after i calculate ,but use multisim to simulate this circuit,i get a answer different completely with the calculate answer.Example the Vout,also is most importent value,the calculate answer is -2.1V,but the answer of simulation is possitive value!y will like this?It i use the...

Does anyone know any good software to calculate the need for cooling/heating and such in builidings? One where I can change properties of almost every building aspect, such as wall-thickness, insulation, sun conditions, windows, outside temp, inside temp, and so on to find the energy needed to...

I am working on creating a simulation of beats. I need to start with: (where w is angular frequency), w1 + w2 = w1,2 then w1,2 + w3 = w1,2,3 then w1,2,3 + w4 = w1,2,3,4 and so on, to create a wave packet where I will plot w1,2,3,4...n. My problem is that I do not understand how to...

Okay, I've got this problem in my Chemistry class. It's about half-lifes and all that. If this is the wrong place to post this, then somebody can move it I guess. I've got a 10.0 g sample of an unknown. They give me the following info, wanting me to plot it on a graph. That's the easy...

Ive been thinking a lot and come nowhere, is it possible to create a program with a 2D envirment where the temperature change from place to place and make the computer calculate a current in the fluid? if so how would the mathematic look like then?

Is it theoretically possible to simulate a quantum computer by a real one (ie a Turing machine equivalent) even approximately? Any comments? Sorry if this has already been discussed. :confused:

HI and Hello, i would like to simulate a plasma discharge (z-Pinch discharge) with the Femlab Software 3.1i. The resulsts should be the density of the plasma or the temperautre after a compression. As input parameter serves the measured time dependent current. I have tried the...

Hello I'm a french student, I'm actually not sure this is the good place to ask my question but as it deals with the nuclear fission I try here... don't hesitate to tell me if there is a better forum... thx.. well, I'm trying to solve numerically the Langevin equation, initially for...

I need badly some materials or instructions on how to simulate fluid flow or similar/related things to finish my research in the next 3 months...Do you know where I can find some to read, or places where I can download source code ?? Anything about it is really fine, how to simulate is also...

I've been working on a program that simulates the chaotic action of a pendulum with magnets near the 'bob'. I represent the pendulum as a constant length rod at an angle to the vertical. The angle is a vector, with the direction being the axis it is rotated around and the magnitude being the...

Hi, I´m looking for a program (free or cheap download) that can simulate the nearfield of a coil/ field of inductive antennas preferably in 3D. Does anyone know if such a thing exist? t.

I am looking for a software that will allow me to predict the motion of a ball on a particular surface. In reality, surface is made of a large, framed rubber sheet that is pulled by a heavy weight at the middle. A marble is rolled across the sheet in circles, elipses, spirals, etc. The function...

I'm looking for some options for good circuit simulation and design software (for electrical systems and electronics). We use OrCad (PSpice) at school, but I find it very messy. Is there a program that is both easy (and logical) to use, yet powerful and flexible? Any suggestions and...

Need a check on this one please. In an Atwood Machine simulation, m1 is 1.0kg and m2 is 1.1kg. m2 rests on the floor that exerts a normal force, Fn, on m2. when the system is in equalibrium, the tension, T, in the rope at 2.54s is 9.789. If Fn +T- m2*g = 0 then Fn = .991. Is this correct?

Hi ! first, excuse my english, I'm just a poor french student... and we are so bad in languages here... anyway.. I'm trying to make a little program which could calculate the motion (and some other little things) of n bodies linked with gravitationnal interaction. (my final aim will be to...

you don't even have to know the rules of poker to help me out.. this should be very simple math but i just can't figure it out... 10 players (including me) are dealt 2 cards each. Of 169 possible starting hands, i only want to play 16 of the best hands (the remaining 153 hands i would...

Hi, Could some body please explain me how to identfy the size of simulation box in cosmological n-body simulation with the physical scales in the universe. For example if I am using 128 grid points along one direction in a Particle Mesh code and total number of particles are 128*128*1228. Now...

I've just got my final year project assigned. It has to do with a numerical simulation of a Ram Accelerator device. Well, apart of having doubts, which I will post just here proximately, I would want to know some website to learn more about that type of device. Apart of Google sites...

Hi everyone! Despite I have not too much knowledge of ODE's I'm trying to implement a more or less general 3D physics simulator. By now, the simulator (only kinematics and simple rotations of a body rigid, at the moment) works with euler integrator but I'd like to move to some more...

First, hi. This is my first post, and after careful perusing of the forum I *think* this post is in the correct place. Feel free to move it around if not, apologies. The meat of my questions. I'm a High School student that would like to simulate atoms on the computer. I've been getting...

Hello, This sounds like a silly idea, but I am trying to simulate all forces of in the universe on my computer, putting in the correct physics equations for each force, one by one. I was already able to simulate the force of gravity with the following formulas/equations: G = 6.674205043E-11...

I am creating a circuit building simulation using multimedia software 'Flash'. Basically the user is presented with a circuit board onto which they can drag components such as batteries, resistors, bulbs, ammeters, voltmeters, switches, and of course lengths of wire. I have been reading...

I was wondering if yall could help me out with creating some formulas to use in an artillery simulation. I'm barly in HS and this sort of thing blows me out of the water. Theres 3 parts you need, I have the first mostly figured out. You are given the latitude and longitude of both your...

http://www.medphys.ucl.ac.uk/~martins/orbit/orbit.html One of the best programs for anyone interested in orbital mechanics of space flight or anyone who just wants to simulate a shuttle or Apollo flight with a joystick. :smile: I found this a couple of days ago and have downloaded about...

Hey there. I'm currently studying to become a mechanical engineer, and in one of my projects I'm in need of some program that can simulate aerodynamics of different shapes. I only expect some kind of simple pogram, nothing fancy, but I don't know anything about this kind of program, so I...

Convex Lens How about this simulation program How about this ?>

Hello everyone, I am trying my best to do this simulation on Matlab to show the expancion of Magnetic field lines out of a coil. Now, finding the amplitude and direction of the field at a given place is pretty simple, the trick is to produce those tidy lines we all see in books, i gather they...

The Simulation Argument Are You Living In a Computer Simulation? Nick Bostrom, PhD Philosophy Faculty, Oxford University This website features scholarly investigations into the idea that you might currently be literally living in a computer simulation, running on a computer built by...

Hi. I'm designing a computer game at the moment (it's still in the theory stages right now, since I can't get much done until I've got a working engine for it) -- I make 'ammateur' games as a personal hobby in my free time. However, my latest attempt is a bit more mathematically ambitious than...

I try to program a 3d-physic simulation, with bouncy collisions, friction, etc. and i have a problems with splitting forces at an inclined plane. i know that F_n = F_g * sin(\alpha) and F_p = F_g * cos(\alpha) F_n ... normal force F_p ... parallel force F_g ... gravity force...