Model Definition and 1000 Threads

In adobe photoshop, is it possible to take and wrap a 2D texture onto a 3D model? And is it also possible to make a 2D object from a photo into a 3D one?

I participated in a recent thread where it was obvious the poster was confused about what physical theories are. Of course they are mathematical models, but they say the mathematics can't be the reality etc etc. I am sure regular posters here have seen the arguments - they appear with...

I have some (x,y) data with x in the range of 1e10 and 1e13, y is between 0 and 1. I am fitting this data using several theoretical models to gain an understanding of underlying mechanisms (by which model fits best). Using NonlinearModelFit in Mathematica, I get memory failures and cannot...

Homework Statement Hi guys, I'm going nuts on a problem. Out of memory the problem was a system of N pairs of atoms that interact between each others so that the Hamiltonian of the whole systeme is ##H=-J \sum _{n=1}^N \sigma _i \tau _i## where the only possible values of the ##\tau _i##'s and...

I'm a first year physics student, and one of my assignment for my programming class is about percolation. I need to create some disks randomly distributed in an area (this is a 2-D), and then by varying the density of the disk, I need to figure out the percolation threshold such that the two...

So, I was trying to do a derivation of my own for the FLRW metric, since I couldn't understand the one Wald had. The spatial slice M is a connected Riemannian manifold which is everywhere isotropic. That is, in every point p\in M and unit vectors in v_1,v_2\in T_p\left(M\right) there is an...

Hello, can anyone please explain to me in a different approach, rather than repeating a book definition, what is the Ising model? and what conclusions were made from it? I would sincerely appreciate it, since I can't seem to grasp the concept even after reading numerous articles online and in...

Homework Statement The growth of a giraffe population on an island follows a logistical growth model. The maxium giraffe population on the island is estimated at 1000. The population was first measured in 1970 at 125. Then in 1975 the population was 158 a) Find the rate of change in the...

Can anyone please explain to me what is the Ising model, Hilbert space, and Hamiltonian ? However, please explain it as simple as possible because I am a freshman. I have looked up all three things. I've tried my best to make some sense of it, but I am, honestly, still confused on what any of...

For my senior design project, I have to reduce the aerodynamic drag of a truck and trailer. I am doing CFD simulations and wind tunnel testing. The dimensions of the wind tunnel (test section) are 94 in long, 13.5 in tall and 20 in wide and a cross-sectional area of 270 in^2 and it could go up...

Homework Statement A simple model of a polymer undergoing a helix-coil transition is to describe the polymer in terms of N equal length segments, each of which can be in either a coil or a helix state. A more realistic model also takes into account the energy cost associated with a boundary...

Is that mistletoe that has appeared on PF? TGI Friday's is our role model?

Can someone assist with a simple model for the following question? I have looked on the net but cannot find anything on it. Say you are sat at a desk with the light bulb directly above you switched off and the rest on; so: on - on - on on - off - on on - on - on Each at distance r apart with...

I have this circuit and I must represent it in state space. I know the process because I have done similar ones but having trouble with this one. I have found the Kirchhoff equtations for the 2 loops and for the upper juction, whatever I do after I can't end up to two equations x'1 and x'2...

In the FRW model with Euclidean 3-space, k=0 in the first Friedmann equation makes the density(times a constant) directly related to the Hubble parameter. The Hubble parameter is the time derivative of the scale factor divided by the scale factor itself. My question is: does a Euclidean...

Hello, I am trying to work out a mean field theory for an antiferromagnetic Ising model on a square lattice. The Hamiltonian is: ## H = + J \sum_{<i,j>} s_{i} s_{j} - B \sum_{i} s_{i} ## ## J > 0 ## I'm running into issues trying to use ## <s_{i}> = m ## together with the self-consistency...

My tutor asked us today to consider the partition function of the following model as an aside to our topic at the moment. I went to work out the maths of it today and I'm quite stuck for how the calculation can proceed. It's a 1d closed chain with some number, n, points. Each point has some...

From the textbook of Omar: Can someone explain me the summation of this? I simply don't get it? Thanks in advance.

Homework Statement By using the Bohr model of the atom: whats the lowest energy transition from the n=2 to n=1 state in Hydrogen (Z=1) Homework Equations En = -13.6eV*Z2/n2 The Attempt at a Solution En = -13.6eV*Z2/n2 n=2 -> n=1 for hydrogen (Z=1) E2= -13.6eV*12/22 =-3.4 eV E1= -13.6eV*12/12...

Hi experts! Do you know how to export an ANSYS model into STL format? I´ve only found some method for solid meshes here http://www.padtinc.com/blog/the-focus/color-3d-printing-ansys-ansys-mechanical-and-mechanical-apdl-results, but my model contains only BEAM4 elements. Would it be possible...

Hi, I've read on the cern website that the standard model does not predict that matter inherently has mass, if this is the case how does the model predict particle masses and also why doesn't it predict that matter inherently has mass? Thanks.

I have a state space model along with an observer and state feedback. I need to find the transfer function connecting the r (reference) to the y (output) I have this model on simulink. I know the A,B,C,D matrices. So, I can get the TF for the stateSpace with ss2tf function of matlab...

Homework Statement In Bohr's model the allowed paths are those which the angular momentum is quantized by L=ħn and the electromagnetic radiation emission is only by transition through two of them ν=(Ei-Ef)/h. I am asked to use the above assumptions to calculate the energy levels and the...

Hi my name is Federico and I'm a student of mechanical engineering and i have to make a research on this material: waspaloy. Now, i have the flow stress model, but i don't have some constant of this equation. In particular , there are a classic JC model where stress is...

Homework Statement The "particle in a box" is the simplest quantum system. Despite this, it still reveals a lot of important new quantum features. Please use the "particle in a 1-D box" model to explain the reason why when the size of a quantum dot gets smaller, the wavelength of the emitted...

Homework Statement My team and I are working on a design project to design/modify a device that can go on hikes for paraplegic/quadriplegic people. Here is the current design (not designed by us): http://i.imgur.com/RAOq28k.png http://i.imgur.com/zgA3aCg.png We are thinking of adding a...

Homework Statement A ball was dropped through a known vertical distance with the time of drop also recorded. The aim of the task is to create a numerical model in excel in order to approximate the drag coefficient. Homework Equations This is my method. 1. FBD for the ball falling. (assume...

Homework Statement I'm setting up an experiment for a simulation. I'm not sure how to formulate the hypothesis. The model used in the simulation is the first iteration, so I'm just using 2 attributes, 1 independent (A) and 1 dependent (B). As a result, I need to state explicitly that this model...

Hello, This is in reference to a senior design project I must do. I have to create a 747-400 wing model in PTC Parametric Creo 2.0. The problem is that other than the wingspan, wing area, and sweep angle, Boeing does not reveal other crucial information such as taper ratio in order to find the...

Hey guys this is my first question, I am trying to solve a first approach of the interacting resonant level model (IRLM), where we suppose that there is only one energy level acting as a quantum dot between the leads. The hamiltonian is of the form \begin{eqnarray} H=\sum_{kL}\epsilon_{kL}...

In the Drude model of the free electron gas to explain the conduction of a metal, the relaxation time approximation that the electron has a collision in an infinitesimal time interval ##dt##is ##dt/\tau##. It can be shown that the mean time between collisions is ##tau##. If we choose an...

Hi everyone, I'm new in physics forum and this is my first post. So basically, our lecturer grouped us and gave each group a project to carry out. And the only information that we got is the name ( The one we got is "Model of the capacitance and dielectric" ). With only this information, me...

hi my dear friends, Wells turbine is the subject of the my Thesis: http://www.upload7.ir/imgs/2014-10/37346220310608280524.jpg i make below model in gambit 2.4 ,But now I want to make the upper airfoil cord bigger than the bottom one. below model is constant,attention to third pictures(...

Earth is changing constantly and there is still so much we don't know about it. Researchers construct a model of impact for El Nino / La Nina events 17 hours ago by https://sciencex.com/authors/bobyirka/ Phys.org) —A small team made up of researchers from the U.S. and Europe has constructed a...

Homework Statement a) From the graph attached (see also Philips book) deduce the Fermi energy for copper using the Sommerfeld model b) Estimate ##v_s## in copper, where ##v_s## is the speed of the low temperature phonon vibration. Homework Equations Sommerfeld model, ##c_v = \pi^2/2 (k_B...

Can someone tell me what is the "dimension" of a model? For example, the dimension of a saturated model. thanks

Homework Statement Title might be unclear since I had little space to explain. I'll state my problem from the beginning: I don't know how to determine one of the constants in formula for the velocity (the maximum velocity on the y-axis to be precise). I need that constant because I want to...

I was thinking about this and either I have a misunderstanding of black holes or they are simply not how the standard model proposes them to be. Lets start out by setting a few a statements from the standard model that you agree with. If you disagree about any of these points please comment so...

From what I can tell, here's what Google, Amazon, Facebook, Microsoft and all the other big-name tech companies of today do: Keep a lean force of developers on staff. The hiring process is very selective. While these workers will have amazing pay and benefits, they also will work long hours...

For my homework I was given a velocity diagram of the Juan de Fuca plate similar to this: The first question is as follows: Measurements indicate that the Juan de Fuca plate is moving at a speed of ~40 mm/year. Calculate, and draw diagrams that show, the horizontal and vertical components...

I would like to reopen a discussion on assertions made by David Mermin such as: “There is no conceivable way to assign such instruction sets to the particles from one run to the next that can account for the fact that in all runs taken together, without regard to how the switches are set, the...

In my studies, I find myself coming back to the same question.How do we know all these things about matter. Its quantized, it has mass and, charge and blah blah blah. I understand that these models of the building blocks of "physical things" are well tested mathematical models that attempt to...

From Wikipedia, the following diagram explains the energy emitted when an electron jumps from a higher-energy shell to a lower-energy shell: I already know that the energy of a single photon is equal to ##hf## and in this diagram, ##\Delta E=hf##. Does that mean that ##\Delta E## is only one...

This question is worded in a confusing way: Question: Write a Mealy finite state machine that produces the 2’s complement result of subtracting 1101 from a binary input stream (assuming at least 4 bits of input). So our input here is e.g. 10010101 or 001011 or something similar, and we want to...

It is seen that interlamellar spacing in pearlite becomes finer by increasing rate of cooling. theoretically this is because the rapid cooling rate produces more nucleation sites for lamella percipitation. so i tried to create a mathematical model using gibbs free energy change during...

I have some doubts/questions about the new BH model. This model gains popularity, but does it make any sense? Q1. Assuming the extreme time dilation inside BH, even tiny anisotropy after the bounce leads to HUGE (billion years) differences in the time of the visible explosion. One can argue...

Homework Statement Here is a picture: http://puu.sh/bZtAu/82bdc201bc.png Homework Equations For force, F = (Ze^2)/4 * pi * e0 * R^3) * r f = sqrt(k/m) * 1/2pi Where e0 = vacuum permeability, 8.854 x 10^-12m and r = radius of hydrogen atom, 5.3 x 10^-11m The Attempt at a Solution I...

I am doing a ER Diagram for a class and having a lot of trouble with a specific piece of the sentence. Anyway, here is the business requirements we are diagramming: The video rental company has several branches throughout the USA. The data held on each branch is the branch address made up of...

Homework Statement This is not homework but relevant to an interaction model that I am developing. I assume an even distribution of sources on a spherical 3d-hypersurface, the sources having a potential as a function of pairwise 4-distance between any two sources. I wish to obtain the sum...

Homework Statement Obtain the critical exponents for specific heat, susceptibility, and the order parameter (magnetization). Homework Equations $$A = -k_B T N \ln \left[e^{\beta J} \cosh (\beta h) +\sqrt{ e^{2\beta J}\sinh^2 \beta h + e^{-2\beta J} }\right]$$ $$\left<m \right> \propto...