Modeling Definition and 554 Threads

I can't help but think that some day, someone will figure out a way to get a computer to recognize patterns in a given set of data, and fit an equation, if there is any, to that set. Such a system could be used in areas like forecasting stocks, weather, and sales, or even in air traffic...

So I am trying to model the different states of education one can achieve. These include Elementary school, Middle school, high school, community college, 4 year university. Each one will be a different state(Ex state 1 = elementary school). Some states will be connected together with a...

Aerocapture: Aerodynamics OR Aerodynamic Heating OR High-Altitude Atmospheric Model I apologize for the many topics covered at once here, but, this is why: I'm trying to design a vehicle to make aerocaptures from Earth to Mars, and from Mars to Earth (I do these kinds of things quiet a lot...

Homework Statement A brick of mass 6 kg hangs from the end of a spring. When the brick is at rest, the spring is stretched by 3 cm. The spring is then stretched an additional 4 cm and released. Assume there is no air resistance. Note that the acceleration due to gravity, g, is g=980 cm/s2. Set...

Wheeee! More confusing thread titles! Here, let me elaborate: What I intend to do here is figure out a way to roughly model the results of planetary (or larger) bodies impacting, or a planetary (or larger) sized body being impacted by a smaller body that is moving with enough relative...

Where/how can I learn about modeling and simulating situations/experiments for any physical situation (optics, thermodynamics, nuclear reactions). I'm an Computer Engineering student and I don't believe there are any classes being offered for modeling and simulation. What would be a good start...

Hey, sorry for the basic question, but I'm curious. Can one create a resultant for 2 vectors that cannot be drawn head- to - tail, and are facing opposing directions? The idea is that I set up a force table and took measurements on how many Newtons of force are acting upon each spring...

Homework Statement uploaded file (Problem 5)Homework Equations uploaded fileThe Attempt at a Solution Ok so I think I have the correct answer but the problem is I don't know how to solve for the actual answer with 2 equations which one do I plug into? Sorry for all the erasing!

Hi folks, This problem is from a trial test (the main test is in one week's time) Quickly for some background to what I have done maths-wise: 1. a crash course in college level maths in the first semester of Australian academic year: (february 2012 to June 2012) followed by crash course in...

I need a mechanical device modeled in Autodesk Inventor, but I just started teaching myself the program about a week ago, and I can see it's going to take a long time to become proficient at it. I'm an artist, not an engineer. So I'm looking for a mechanical engineer that is skilled with this...

I've recently gotten into Mathematics more and more, and I wanted to do some mathematical modeling just to see where I stand on it and maybe try to get better at it. I've looked around as well as I could, and I didn't really find much, so I was wondering if anyone here knew of any good...

For a unit mass sliding down the stationary curve y = f(x) at the point (x, y), we can consider our mass to be sliding down a stationary inclined plane which is tangential to the curve at the point (x, y). The slope of this inclined plane is thus \frac{dy}{dx}(x). For the remainder of this...

Hello, I'm working on a project, and my teacher gave me something to think about, but I am at a loss. He wants me to come up with an equation to model the maximum height a submarine can go underwater, if it can withstand a maximum pressure of 80kpa. I started thinking it was an integral...

To my knowledge I assume: Newton's second law of motion : F = ma = mx'' Hooke's Law F = ks where s is the distance displaced by the mass. When a mass is attached to the spring, the new spring force is: F = k(s+x) While the downward force is still: mg If the two forces...

Homework Statement A person is standing 80 ft from a tall cliff. She throws a rock at 80 ft/sec at an angle of 45 degrees from the horizontal. Neglecting air resistance and discounting the height of the person, how far up the cliff does it hit? Homework Equations r = ((xo + vo*cos(~))t) i...

First off, this is not a homework question. I am simply trying to figure out how to make a discrete time model into a continuous one. I don't expect anyone to work this out for me, I just want to start heading in the right direction. I have a model of a bicycle on a 2d plane that has a...

So a sadistic friend of mine posed this question: Of course this question can be thought of in two ways: a) would the surface still be hot enough at the bottom or b) would the interior be hot enough at the bottom (since the coals would probably break, its a relevant question). At the time...

The study of social science phenomena using empirical data such as register data* are very often approached with an regression model. One of the most used approaches is a linear model where the parameters is estimated with ordinary least squares. The models of this type is often called...

A radiation source at some point through the collimator of a detector. Modeled as 100 spheres tracing out the image of a circle on a plane some distance above the original position of the source. What I want to do is collect all the spheres that go through the top of a cylinder and then...

Hello there I am sorry if this sounds silly or out dated i want to ask anyone, how can i model the mathematical representation from music signal(time domain). lets say i recorded the signal from guitar through my music production software and print screen that signal as shown here...

Hello. I want to do a thermal analysis of a cabinet having air. Its the temperature distribution I am interested in. How can I model air, and mesh it. I am a newbie to ANSYS. So actually the questions are 1. Can I model air in Pro E 2. Can I model/mesh it in ANSYS. 3. Do I need Ansys CFX?

Mod note: this thread was originally part of https://www.physicsforums.com/showthread.php?t=601879 but has been split off due being off-topic. I would prefer the word understand, rather then model. Well a models serve both to illustrative and verify our understanding, from an instrumentalist...

Hi, I am currently trying to model a set of data using a reciprocal function. I picked a couple of points, substituted the y and x values into two equations but I can't solve it! Here is an example: y = A / (Bx) 30 = A / (4.5B) 0.1 = A / (20B) I tried solving it by all methods I...

Is it possible, in theory, that a radioisotope undergoing nuclear decay (eg. alpha particle emission) can be modeled so as to determine the origin and/or direction of the emitted particle? For instance, perhaps one could model nucleon interactions deterministically and observe that when the...

OKAY I have a trg test make up and due tomroow and I have no clue what I am doing, I've searched online chatrooms and they all want money. so this is basiaclly my last hope the test is over rATIONAL ROOTS ZEROS POLYNOMIALS ETC. please show all work if answering QUESTIONS i NEED HELP ON BELOW...

Hi there, I have been thinking about how to actually describe a system input filter consisting of several caps and an inductance in the state-space representation. The topology follows: a DC source to inductor to two parallel caps that are referenced to the same potential as the voltage...

I am trying to approximate the field of a permanent neodymium magnet as that of a magnet dipole. The magnet in link the below can be modeled by a magnetic dipole of what strength? http://www.magnet4less.com/product_info.php?cPath=11&products_id=123 Thanks in advance!

Okay so after tearing my face off trying to find a 2-cycle, I've managed to make significant process. I divided an enormous polynomial with another polynomial and got a god awful mess which incidentally was correct. Now I'm having trouble solving this equation with x in terms of c...

This question deals with a 1-parameter equation: fc(x)= (4/x)+(x/2)-c for 0≤c≤ 2.3 a.) Use algebra to find the positive fixed point p(c) of fc(x) (in terms of c) and identify its exact interval of existence a.) Ok so for the fixed point I got p(c)= -c+√(c2+8) I'm not sure if this is...

I just was wondering if anyone here has pursued a degree in scientific computing / high performance computing / computational simulation and modeling, type of degree. For example Georgia Tech's Computational Science and Engineering degree or Computational and Mathematical Engineering degree, or...

I do not if it is the right section, however hello I'm Antonio and I am Italian so I apologize for my English. I have a problem I'm trying to manage a mathematical modeling from a graphical point of view, (I applied chaos theory and the theory of earthquakes and using the concept of point...

curious as to the proper way to model this. beam is symmetric so centroid is in the middle (used to calculate distance from centroid d in bending moment of inertia equation) bending moment of inertia is I =\sum(I + Ad2) I=\frac{1}{12}bh b=base h=height d=distance of the area's...

Hi All, I'm working in OpenSCAD to draw up a 3D model of a pan flute that I could print out using a 3D printer and (with any luck!) play right there on the spot. I've looked up some of the formulas for determining the pitch of a open ended tube but I have some questions... Wikipedia says that...

Hi guys, just embarking on the journey of modeling with differential equations and solving them. I have a more conceptual quesiton. Linear differential equations in my book are defined to be ones where F(t, y, y', y'',...,yn) = 0 is a linear function of the dependent var y and all of its...

This a plankton herbivore model. The dimensionalized model is $\displaystyle \frac{dP}{dt} = rP\left[(K-P)-\frac{BH}{C+P}\right], \quad \frac{dH}{dt} = DH\left[\frac{P}{C+P} - AH\right] $ where $r$, $K$, $A$, $B$, $C$, and $H$ are positive constants. The dimensions of K, P, B, H, C have to...

Can anyone refer me to an introductory text about math modeling of mortgage backed securities?

http://www.openvsp.org/

Hi, I am trying to model electrical equivalent of a coaxial cable. The data I have is 1. Conductor resistance 2. Insulator resistance 3. Partial discharge 4. Insulation Thickness 5. Overall diameter Actually I planned to use an equivalent circuit that has series connection of...

Hi, I'm an online poker player and i need some help modeling a promotion that the site where i play offers. I think it's rigged and intend to prove it but I'm short on skillz. The promotion is described here and i already made a model but can't solve it. It goes like this: Supose you have...

I am trying to make simulation of severe accidents in advanced nuclear reactors. Can anybody advice me in how to write the input deck? Is there any training materials about that? Please, share your experience in simulationg nuclear reactors, problems you faced, etc.

So I've been having a bit of fun with FFT's of some nonlinear functions applied to sine waves and I noticed 'reflection' of the harmonics due to generation of frequencies beyond the Nyquist frequency. This comes as no surprise, but it left me wondering how one might model nonlinear systems...

I am trying to determine how to accurately model an open system which includes: A tank: Volume = 1320 gallons An exit pipe from tank: Diameter = 3 inches The tank is compressed from atmospheric conditions to a final pressure of 100 psig. Then the tank is allowed to decompress by opening a...

Musical-recording age Since the dawn of the musical-recording age, the preferred method of recording guitars has been to set up microphones in front of amplifiers and capture the sounds produced. This carried the limitations of eliminating the electromagnetic signal bleed from the amplifier...

Is there any website that already has 3-D models of steam generators, turbines, reactor vessels, cooling towers, or containment vessels? I am trying to develop some models so that I can rapid prototype scale model nuclear power plant components. The reactor will hold water and will be pumped...

Hi guys, I'm doing some thinking about random walk. Imagine there is a bounded 2D plane and a single spawn point. The spawn produces units which must bring in minerals scattered around the spawn. The locations of minerals are not known, so the units diffuse randomly away from the spawn...

Homework Statement I am trying to come up with a logical explanation (using an example from real life modeled in Combination and/or Permutation) to show that 3^n = summation (from i=0 to n) of (n choose i)*(2^i). In other words, I am trying to pose a combinatorial/selection/combination...

I recently noticed that in Silvaco Atlas (device modeling software), the default bandgap of silicon is given as 1.08 eV. This is at 300 K, no bandgap narrowing, and no other secondary effects - it is default. However, most (all?) of the modern references (e.g. Sze, Streetman, Pierret) give the...

I am currently a double major in biology and math, interested in mathematical modeling of ecosystems and physiological systems. The math portion involves modeling and pure math, but there isn't a lot of concentration on knowing physical laws. I'm not sure if I would miss all the knowledge...

When I try and model a curve using a sine regression with my graphic calculator, it returns an error message that says: Singular Matrix I decided then to do it by hand. Here are three points. Minimum: (0,554.8), Maximum: (45, 1220.5) and a random point (20, 830.7) I want something in...

Hi All, Just wanted to know, what is a good way to learn mathematical modeling? I'm a social scientist working with simulation and data, and would like approach the issue more formally. Before trying modeling textbooks, what should I know beyond calculus? Any suggestions (books, tutorials...