Systems Definition and 1000 Threads

A system is a group of interacting or interrelated elements that act according to a set of rules to form a unified whole. A system, surrounded and influenced by its environment, is described by its boundaries, structure and purpose and expressed in its functioning. Systems are the subjects of study of systems theory.

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  1. jbrussell93

    Schools Preparation for grad school - nonlinear systems

    Lately I have been reading about nonlinear systems and chaos. It's fascinating and I would like to know more about how I could prepare myself to possibly study this in grad school. I would be interested in looking at biological systems such as neural networks or even animal populations. I'm a...
  2. V

    What branch of math deals with nonlinear systems?

    Like linear algebra goes in depth about linear systems, what should I look for to learn about the extension of linear algebra to nonlinear systems? Is there a name of the field of study? If I go into a book store to buy books about it, what should I be looking for? Abstract Algebra? Complex...
  3. J

    Equivalent Force Systems: Statics Review

    I know how to approach this problem. First, I will need to find the reactions at the supports. Then apply Joint or Section Cut Method to find the forces acting between the members. Then take the force acting on member b0b1 and plug in Euler Buckling equation, while choosing the correct...
  4. M

    Systems (under control) which constantly go from stable to unstable states.

    Hi. I would appreciate if some one could help me with my question. But first some background: There is a classical problem of inverted pendulum under control. Pendulum can be put to UNSTABLE equlibrium and (if no control applied) it can put itself to STABLE equlibrium. So system under...
  5. T

    Solving Linear Systems with Hermitian Matrices

    Homework Statement I can find my eigenvalues just fine, and they're both real, as expected. My first eigenvalue is -3, which I know is correct. I have the equations 5x+(3-i)y=0, (3+i)x+2y=0 Both of the equations come from my hermitian matrix, after I substituted λ=-3. Homework...
  6. I

    Time Dialation and Biological systems

    Can anyone prove that Time Dialation affects biological systems?
  7. M

    Interpretation of 1D Band Gap in Metallic Systems

    In a metallic system, the Fermi level is crossed either from the conducting zone into the non-conducting zone or vice versa. Is there an interpretation one can give to the direction of the crossing? In other words, if the 1D band gap diagram shows the fermi line is crossed from the...
  8. harrylin

    Scientific method versus belief systems

    This is a retake of a recent question that was perhaps misunderstood by the moderators. As a reminder: "As a rule of thumb, some topics pertaining to religion might be permissible if they are discussed in such a way so as to remain neutral on the truth of, or value judgments stemming from...
  9. M

    Aerospace Engineering Space Systems Design Careers?

    I plan on switching from electrical to aerospace engineering in the winter and aerospace engineering at my university is basically split into 4 parts, the one that seems to interest me the most is the space systems design), but I'm curious if there is any aerospace engineers here who are in that...
  10. C

    Using Advanced Physics to Model Biological Systems?

    Using Advanced Physics to Model Biological Systems?? Just out of curiosity, is physics (advanced or theoretical, not simple classical physics like thermodynamics or mechanical properties) ever used to model, solve, explain, or apply to medical or biological (human) systems? I know hemodynamics...
  11. S

    Right-handed, left-handed systems for different coordinate systems, et al

    I know the orientations of the x-, y- and z- axes for a right-handed and a left-handed system. But that's for the cartesian coordinate system. How are the orientations of the coordinate axes for other coordinate systems defined? Also, i X j = k, j X k = i and k X i = j. How does this apply...
  12. G

    Thermal-hydraulic codes for cores and thermal-hydraulic codes for systems

    I am quite confused for the thermal-hydraulic codes for cores and the thermal-hydraulic codes for systems. I know COBRA is a thermal-hydraulic code for cores and RELAP is a thermal-hydraulic code for systems. For the reactor transient analysis, Does it need to couple the neutron kinetics codes...
  13. F

    Electrostatic Discharge in Hydraulic Systems

    I know this is a general Mechanical Engineering forum, but there is no Hydraulic forum and this is the nearest trade. https://www.youtube.com/watch?v=47Dx6TvuJTc I've been doing a project on electrostatic discharge, and the company I work for (I won't mention the name as I'm not here...
  14. J

    Multiple lenses systems - specific scenarios

    Homework Statement Hi all... this isn't really a homework question, but more a question to reinforce the concept of multiple lenses. Firstly, it makes sense that the image location of an object would be behind a 2-convergent lenses system, provided they are sufficiently spaced apart...
  15. M

    Quantum mechanics of hydrogen and many-electron systems

    I'm looking for the BEST and most COMPLETE book describing - The quantum mechanics of the hydrogen atom (working out completely the Schrödinger wave equation) - The quantum mechanics of many-electron systems (with a thorough explanation of the independent particle model, central-field...
  16. J

    What is the magnitude of the acceleration of mass 1 in this system?

    I need some clarification here... Homework Statement There are two masses and a pulley. The pulley has R = .12m and I = .09 kgm^2 Mass 1 in hangs freely in the air and is 4kg mass 2 is on a table(no friction) and is 6kg I am finding the magnitude of the accel of mass 1...
  17. B

    Benchmark problems for dynamical systems

    Homework Statement Not really homework, but I couldn't find a better place to ask. I found an interesting paper and I'd like to test out the ideas it contains, since the code is available for free. The paper is "Evolving Fractal Gene Regulatory Networks for Robot Control". While the "test"...
  18. L

    What are the Best Books for Studying Signals and Systems?

    Hi all, I will be studying Signals and Systems later this year and it would be great if you could recommend me some books, tell me why you prefer them over others and describe them a little. The contents of the course will be both time-continous and time-discrete signals, sampling, Z, Fourier...
  19. G

    Roots of polynomials as nonlinear systems of equations

    Ok, to start off I have been examining the structure of polynomials. For instance, consider the general polynomial P(x)=\sum^{n}_{k=0}a_{k}x^{k} (1) Given some polynomial, the coefficients are known. Without the loss of generality...
  20. R

    Studying Studying Astronomy after Systems Engineering?

    Hi, I'm in my second year (out of 5) of Systems Engineering. I would love to study Astronomy (which is also a 5 year career) after I get my degree, but I don't know how useful it would be to finish studying that late, and I'm not sure how useful it would be to have both degrees. Obviously I'd...
  21. R

    Question about the Two-Body systems

    Two blocks of identical material are connected by a light rope on a level surface. An applied force of 55N [right] causes the blocks to accelerate. While in motion, the magnitude of the force friction on the block is 44.1 N. Calculate the acceleration of the blocks...
  22. Y

    Nitrogen Systems: First Positive, Second Positive, First Negative

    What is the "first positive", "second positive", "first negative" systems of nitrogen Hello, I have been trying to catch up on spectroscopy theory, and I'm trying to get a grasp on what all the terms mean. I constantly seem the terms "first positive system", etc... coming up, and I'm not sure...
  23. L

    Question from a non-engineer: Pulley Systems

    Hello from a non-engineer. This post has a very practical purpose: I'm about to move into a small loft apartment with high ceilings but limited living and closet space. I'd like to find some way to mount a pipe to the ceiling via pulleys and rope or cable that can be lowered and raised with a...
  24. S

    Useful pi systems generating the borel sigma algebra

    Homework Statement For the purpose of my module, we define the lebesgue measure over Int(a,b) where Int(a,b) = (a,b] where -∞≤a≤b<∞ (a,∞) else And l((Int(a,b) = b-a a≤b<∞ ∞ a≤b =∞ And thus we say the borel sigma algebra is generated by...
  25. G

    Three outcome systems in Bell/CHSH

    Hello everybody, In Bell's theorem and CHSH, A(a, \lambda) is defined as the outcome for detector A with setting a and hidden variable \lambda. The outcome of this can be either -1, 0 or 1, so three outcomes. It is clear what outcomes -1 and 1 refer to. But what about 0? Two relevant...
  26. R

    Advice on Aerospace Systems Engineering

    Hello all I have an MS Systems Engineering, BS Computer Science, and AS Engineering. I'm looking for a PhD program in Systems Engineering but with a specialty in a technical area. It appears one possibility is Aerospace Engineering. My academic adviser has not been supportive of...
  27. C

    Schmidt factor and slipping systems

    correct me if I'm wrong please: Initial slip system is [011] (-1-11) If I have a tensile axis orientated in [-214], as slipping proceeds it will rotate towards the following direction: [-214] + n[011] = [-225] it will rotate towards the [-225] direction. once it gets there, there...
  28. D

    Systems of Homogeneous Linear Differential Equations

    Homework Statement I uploaded the problem statement please see attachment for original problem. The problem number is 4. Homework Equations The Attempt at a Solution For clarity I uploaded what I have done please see the attachment with my work on it. I am not sure if I am doing...
  29. L

    How Can You Optimize Material in Manufacturing Open-Top Square Base Boxes?

    Homework Statement Suppose that you are the manager of a sheet metal shop. A customer asks you to manufacture 10,000 boxes, each box being open on the top. The boxes are required to have a square base and a 9 cubic foot capacity. You construct the boxes by cutting out a square from each...
  30. L

    Systems of Nonlinear Equations

    Homework Statement A wire 60 feet long is cut into two pieces. Is it possible to bend one piece into the shape of a square and the other into the shape of a circle so that the total area enclosed by the two pieces is 100 square feet? If this is possible, find the length of the side of the...
  31. D

    Incredibly simple question about the logic behind systems of equations

    I know this is a simple question but I can't exactly figure out the logic governing this problem, I just know it had to be this way. Let's say I have two equations: x - 4y + 9 = 0 y - 3x + 5 = 0 If I set them equal to each other then I get no where because I'll have both x and y in the...
  32. A

    Java Java software for solving linear systems

    Hi, I made this program in java, take a look: https://github.com/BetoKahn/Gauss For the english version I didn't uploaded the code, only the runnable .jar file. For the portuguese speakers you can see the code. I hope you enjoy,
  33. A

    Fault analysis in power systems

    I would like to know relevant materials/links that would help ma further my research in fault analysis.Thanks
  34. J

    Application of Maxwell Boltzmann velocity distribution to nanoscale systems

    Dear All I have a question about the validity of Maxwell Boltzmann velocity distribution in the case of nanoscale systems. When you consider a nanoscale system such as flow of water molecules (less than 100 molecules) through a carbon nanotube or graphene sheet, is it possible to expect a...
  35. S

    Number systems: construction of rational numbers

    Homework Statement let a and b be rational numbers if a>b>0 show that there exists a natural number n, which can be considered rational as well, st nb>a Homework Equations The Attempt at a Solution I was trying using the peano theorem of natural numbers define set of...
  36. B

    Special Relativity and Binary Star Systems

    Homework Statement Suppose that you decide to look at a known binary star system. The system is too far away to resolve the individual stars, so it appears to be just one point of light. By looking at the spectrum of the system, though, you should be able to use the Doppler shift to determine...
  37. S

    Modelling Complex Systems - Topic selection

    Wasn't really sure where to post this - it's not much of a problem - rather hoping for some suggestions on an essay topic: I'm required to write a short essay (in the style of a wikipedia article, 1500-2000 words) for a 'Modelling Complex Systems' module; I've been given the following...
  38. B

    How to Write MATLAB Code for Control Systems with Variable K?

    I have a given system and I need to A) determine the transfer function B) find the values of K form Routh-Hurwitz C) Determine the values of K for the stable region D) Create the simulink model. I want to know how to write my MATLAB code so that I can solve what I need to. I DO NOT want...
  39. L

    What is the optimal ratio of peanuts to cashews for maximum revenue?

    Homework Statement A store sells cashews for $5.00 per pound and peanuts for $1.50 per pound. The manager decides to mix 30 pounds of peanuts with some cashews and sell the mixture for $3.00 per pound. How many pounds of cashews should be mixed with the peanuts so that the mixture will...
  40. M

    Homework Help Signals and Systems

    I was trying to solve out this problem for homework and I came to the answer of all of them being false because they all went to infinity...but I have a gut feeling that this is wrong.
  41. M

    Conditions upon overdetermined linear systems

    Hi All I have an exam tomorrow morning, I've almost completed my study guide but there are a few questions I have no idea how to answer. If someone here could give me a few pointers, or tell me how to solve it, or maybe you already know how to solve it; I can study off your solutions. Any...
  42. X

    Interacting systems and relaxation times

    I got a question I'm not sure how to state precisely or is it even valid. Any help is most welcomed. I stripped the question of all details because I wanted to emphasize my problem, but should someone think they would bring any clarity (it is a solid state problem) I'll present them. Ok...
  43. I

    Why don't AI systems have good voices?

    Why don't AI systems have "good" voices? Is it difficult to engineer an AI system that actually sounds like a human (in terms of speaking)?
  44. P

    The relationship between coordinate systems and reference frame

    Hi there, I am confused about the relationship between coordinate systems and reference frame in GR. I understand the coordinate systems can be used to describe reference frames, for example, Local inertial frames in GR can be defined by Riemann Normal Coordinates. However, take the...
  45. I

    Good method for checking solutions to linear systems of equations by hand

    Hello all, I was wondering if any of you have a good method for checking your answers to linear systems of equations(when working by hand). I mean the sorts of equations you would encounter on a first university linear algebra course. I solve the system with Gauss/Gauss-Jordan elimination...
  46. H

    MATLAB Matlab simulink + control systems + 3D model how?

    I am fairly new with simulink and only went through a couple of tutorials on how to use it. but i am looking to do some control system design with a 3D model. I know i have lots to learn so i would like to get some directions as to where i should go to reach my goal. I am looking to...
  47. C

    What are the operative slip systems in hcp metals?

    Hello, I'm having looots of trouble trying to find out the operative slip systems of hcp metals. the slip system is {001}<100> and in my notes it says that there are 3 slip systems and I don't see why! I'm guessing there's only one slip plane the (001) or (0001), and three directions. But the...
  48. G

    Materials Science Help - Slip Systems & Resolved Shear Stress

    Hi everyone, I've taken a course at uni that may be a little bit over my head, and am pushing through an assignment for it at the moment in an attempt to do well. I've hit a bit of a roadblock on one question though, so am hoping that someone kind here can help me out! The question is...
  49. G

    Signals & Systems: Determine System Output

    Homework Statement Given: Impulse response: h(t) = u(t-1) - u(t + 1) (where u(t) is the unit step function) System input: x(t) = t*u(t) - t*u(t-2) Determine System output: y(10) = ? y(1) = ? max y(t) = ? |y(t)| is max at t = ? Homework Equations Convolution integral? y(t) = -∞∫∞...
  50. L

    Question: Run-around coil heat recovery systems

    hey guys ,, how are you all ?? guys , I've got the following problem , Air enters a gas-fired furnace at 20deg at a mass flow rate of 0.2kg/s and is burned with an air-fuel ratio by folume of 12. the gases leave the furnace at 350deg. A run-around coil system is installed to recover some of...
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