A model is an informative representation of an object, person or system. The term originally denoted the plans of a building in late 16th-century English, and derived via French and Italian ultimately from Latin modulus, a measure.
Representational models can be broadly divided into the concrete (e.g. physical form) and the abstract (e.g. behavioural patterns, especially as expressed in mathematical form). Of particular importance in the modern context, conceptual models are central to philosophy of science, as almost every scientific theory effectively embeds some kind of model of the physical or human sphere.
In commerce, a model might instead reference a specific version or configuration of a product offering, rather than functioning as a representation of something else.
In taxonomic settings (e.g. biology, architecture, art) a model is sometimes a particular instance of a set of related entities (species, built structures, artistic compositions) chosen as a convenient reference point around which to build discourse; such a model is almost always chosen to typify some central tendency of the group, exemplify the group's defining characteristic, or reify the group's historical lineage.
Kinds of models include:
It is often said that one of the drawbacks of the standard model is that it has many free parameters. My question is two-fold:
What exactly is a free parameter? My understanding is that the free parameters of a model/theory are the ones that cannot be predicted by the theory and need to be...
Hey Physics Forum
I am currently doing my bachelor project in geophysics, with focus on the evolution of glaciers in Greenland. My project consists partly of programming, because I want to get better at it. I have, however, hit a wall. I can't seem to figure out what is wrong with my code and I...
I have yet to decide on values for the mass of the fixed object, M, the mass of the moving celestial body, m, the initial velocity, v, and the distance between the two objects, r. I will most definitely decide on a larger mass M because I would like the celestial body to spiral in towards the...
Some time ago I made a modelling project and obtained a plot. Now, I want to remember what the transfer function was, as I want to try changing the parameters.
The graph is the following:
How can I obtain the transfer function?
Thanks a lot
Homework Statement
A plane starts its descent from height ##y =h## at ##x = -L## to land at ##(0,0)##. Choose ##a, b, c, d## so its landing path ##y =ax^3 + bx^2 + cx + d## is "smooth". With ##\frac{\mathrm {d}x}{\mathrm {d}t} = V =##constant, find ##\frac{\mathrm {d}y}{\mathrm {d}t}## and...
Looking for existing examples of or guidance on building computer simulations of simple N-bodies in relativist situations. Of particular interest is the simulation of a planet orbiting a star whilst that trivial solar system is caught in a dark flow of relativist velocity; maybe .8 or .9 C.
Not...
mod: approved
HexSim Life History Simulation Modeling Platform - free to download. Landscape ecology, anyone?
After >10 years of development, the HexSim life history simulator is ready for use by students and researchers.HexSim is a free, versatile, multi-species, life history simulator ideal...
I've previously studied and used the k-epsilon turbulence model within Ansys to model water in a small stirred vessel. I am now interested in CFD models appropriate for modeling flue gas dispersion.
I'd like to know:
What additional considerations are required for modeling a gas as opposed to...
Preface
There are lots of times in physics when we use approximations of a more accurate or fundamental physics theory because it is easier to work with.
For example, in quantum chromodynamics (QCD) lots of calculations are done using the Schwinger-Dyson equations rather than the actual...
Homework Statement
Suppose at time zero, the bob was drawn upward four units from the equilibrium position, let C=2, K=2, m=1 lbm, initial speed=2 unit/sec find an expression for body's position.
and in the solution it says: y''+6y'+5y=0
my question is: from where does the numbers (6) and (5)...
Consider the conceptual model presented in the attached image, of heat conduction in a bar.
There is a heat source at left side and heat is observed at point Ho after a distance L from the source. If we consider only heat transfer through conduction then this problem can be modeled by...
Hey!
I hope this is the right place to post this. I'm looking for recommendations for a modeling/drafting cad program that is relatively affordable and capable. I have extensive experience with NX and Solidworks, but can't justify paying for either of those to simply use at home. My non-work...
I have a 2D regular grid of vectors representing average headings on a 2D spatial domain. These are generated by stochastic simulation of chemical-sampling and gradient-estimation techniques for a robotic search algorithm seeking a chemical source.
Without going into a lot of detail, I would...
Homework Statement
For each of the following, determine if the system is linear. If not, clearly state why not.
(a) ##y''(t)+15y'(t)+sin(y(t)))=u(t)##
(b) ##y''(t)-y'(t)+3y(t)=u'(t)+u(t)##
(c) ##y'(t)=u(t)## and ##z'(t)=u(t)-z(t)-y(t)##
Homework Equations
None
The Attempt at a Solution...
Hello,
Given a simple electric circuit like the one below (taken from Wikipedia)
If we were to start from tracking all the forces acting on each individual free electron in the circuit, would it be possible to eventually find all the currents and voltages acting in the circuit?
Probably a...
Hi everyone,
I've been working on developing a crypto-currency called eQualityCoin for a while now and hoped someone here might be able to help me "classify" the system in a formal mathematical sense.
The system's main feature is a simple rule for how it determines a purchaser's exchange...
Hi,
I am currently trying to model a water-cooled scroll compressor but do not have enough data to predict output conditions.
At the moment, I can collect inlet and discharge pressure, outlet temperature, water mass flow rate as well as inlet and outlet temperature.
I would like to be able to...
I am using Workbench 14.5 structural and trying to model stretching of a 3D with a hole. the boundary conditions i am using are (as in the image):
1. frictionless support for below, left and back faces
2. displacement for right face
as you can see in the result the upper face deforms and that is...
Hi,
I am a student interested in wetting and super-hydrophobic surfaces. I am very new to this field and am a software engineer, and as such do not have strong mechanical or chemical background. I am trying to model contact angle and surface energy for super-hydrophobic surfaces. However my...
Hi,
I am a beginner user in the Abaqus software.
I am trying to model the load on a piezoelectric to find the output voltage (EPOT). The model consists of the a load on the top surface of piezoelectric, the piezoelectric, and fixed condition in the bottom in the direction of Z. The problem is...
The importance of modeling and simulation for understanding physics is a central question of didactics. System dynamics is a promising method to achieve this goal. This method is applied at the Zurich University for Applied Sciences (ZHAW...