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. Y

    MHB Solving Systems of Equations with Whole Numbers

    Hello all I have a couple of short questions, both similar, which I do not know how to even start, and I could use some help. 1) Show that if in the system Ax=b, det(A)=-1, and all the members of A are whole numbers (belong to Z), and all the members of b are whole numbers (belong to Z), then...
  2. M

    Block Diagram Reduction - Control Systems Engineering

    Homework Statement Determine the closed loop transfer functions of the systems shown below: Homework Equations Standard block diagram algebra. The Attempt at a Solution I've moved the take off point such that the diagram now looks like: I am having difficulty determining G1(s). The...
  3. V

    Discover the Basics of Creating Reverb Systems with Transducers

    This is no project, I am trying to explore the basics of an unknown subject. Why do we require transducers to create reverb? And how exactly is it created?
  4. RicardoMP

    Fixed point method for nonlinear systems - complex roots

    Homework Statement I've been asked to graphically verify that the system of equations F (that I've uploaded) has exactly 4 roots. And so I did, using the ContourPlot function in Mathematica and also calculated them using FindRoot. Now, I've to approximate the zeros of F using the fixed point...
  5. F

    What is the link between chaos and ergodicity in mechanical systems?

    There are many formal definitions of an ergodic mechanical system. 1) A system whose time average equals the ensemble (space) average. 2) A system that visits every point in its phase space. Etc. What are some actual, real examples of an ergodic mechanical system? Also, since a chaotic...
  6. K

    Some Thoughts on Atmospheric Systems

    Atmospheric sciences are—much like the sister science of astronomy—primarily observational sciences and not primarily experimental sciences. The atmospheric systems that we study are not well-defined systems under controlled conditions, but ill-defined systems under completely uncontrolled...
  7. JesseJC

    Engineering Should Systems Engineers Worry About C++ Coding Skills?

    Hello, so I'm going into my second year of engineering and everything is swell. I plan to choose the systems option when it comes to that time. There's only one thing that has been giving me trouble, and it is the introductory c++ course, I cannot, for the life of me, code. I can't really stand...
  8. R

    Why do we have multiple number systems in computing?

    We use decimal base system in almost all our calculations. Computer understands only binary of base 2. Then why octal, hexadecimal etc?
  9. Ackbach

    MHB Good book recommendation on number systems.

    What would be a good book that starts with the Peano axioms about the natural numbers and constructs, rigorously, the natural numbers, whole numbers, integers, rationals, reals, and finally complexes? I would prefer it if the book did not leave out major steps, but instead went in a logical...
  10. Ronie Bayron

    Are there any planetary systems that are influenced by EM waves?

    Is there any star systems (planetary) that are influenced by the EM Force, hence as usual,sum of the charges of elements in the universe are electrically neutral.
  11. A

    Why Does the String in a Pulley System Apply a Downward Force of 2T?

    in string pulley systems(like atwood machine),the string applies a force on pulley of force 2T downwards,but why is it so? why should it apply that force? explain in detail
  12. G

    Signals and Systems + Electromagnetics classes

    Hi All, I am a EE student and thinking about doing the following classes in Spring 16 - Signals & Systems + Electromagnetic + Physics 3. Any suggestions is Emag and Signal and systems very hard?, what Math do you need? (Dif Eq) Is it a bad a idea taking these classes at the same time...
  13. T

    General Question About a System of DE's

    We were looking at some examples of systems of differential equations in class a couple days ago, and some of them were simple looking systems. One such was ##\frac{dr}{dt} = 4j## ##\frac{dj}{dt} = r## Why is it that we can't treat this as a scenario where both sides of each equation could...
  14. J

    Sum of Translational and Angular Forces

    Hello, I'm trying to figure out the free body diagrams for the inverted pendulum problem and I'm having trouble figuring out the one equation: ##Psin\theta + Ncos\theta - mgsin\theta = ml\ddot{\theta} + m\ddot{x}cos\theta## I've never really seen a mixed sum of forces equation before where some...
  15. D

    Green's functions for translationally invariant systems

    As I understand it a Green's function ##G(x,y)## for a translationally invariant differential equation satisfies $$G(x+a,y+a)=G(x,y)\qquad\Rightarrow\qquad G(x,y)=G(x-y)$$ (where ##a## is an arbitrary constant shift.) My question is, given such a translationally invariant system, how does one...
  16. T S Bailey

    Are formal systems of first order logic incomplete?

    Godels Incompleteness Theorem states that for any formal system with finitely recursive axioms we can construct a Godel sentence G that is unprovable within that system but is none the less true. Does this still apply to formal systems which, instead of creating Godel numbers for arithmetical...
  17. H

    Comparing two energy systems - two boxes being pushed

    Homework Statement Starting from rest, two identical boxes are pushed through the same distance. Box A experiences a force F, while box B experience a force 2F. What is true about their final speeds?- The final speed of box A is twice that of box B. - The final speed of box A is equal to that...
  18. STEMucator

    Solve Convolution Systems: Integrate Impulse Response & Input

    Hi everyone, I'm having some trouble understanding how convolutions are applied to systems. Suppose I'm given the impulse response of a system as ##g(t) = u(t)## and I'm also given the system input ##x(t) = u(t) - u(t-2)##. The system output should then be given by: $$y(t) = g(t) * x(t) =...
  19. T

    Physics of Complex Systems Vs Plasma Physics/Nuclear Fusion?

    Thank you for opening my first thread. I have just began studying Physics at a university in Hungary and would like to get some information about Physics of Complex Systems and Plasma Phyics/Nuclear Fusion. In my life, finding a goal have always helped me work harder and focus on my studies...
  20. erbilsilik

    Understanding Boson Systems: Resources & Tutorials

    Homework Statement What is boson? Quantum mechanical properties of bosons. Statistical properties of bosons. Applications of bose systems. Thermodynamic and statistics properties of ideal bose gas. Homework Equations Looking for a good resources for undergraduate or graduate level. The...
  21. S

    Macroinvertebrates in stream systems

    Hey pf! Learning about macroinvertebrates and their relation to stream systems, and I am trying to understand what stream factors affect their distribution and diversity! I understand that flow rate, and substrate for example have an affect, but why exactly flow rate affects macro's is still a...
  22. J

    Dynamical systems and thermodynamics

    Is there a mathematical way to show that a dissipative (or general?) dynamical system obeys the laws of thermodynamics? I am looking for books/sites/references, thanks for any reply.
  23. A

    Thermodynamics Problem - Adiabatic Reversible Process....

    Homework Statement A specific type of ideal gas has a specific heat capacity at constant pressure (cp=cv+R) that is a function of temperature T, such that cp=0.5+876T, where cp has units of J/kg/K and T has units of K. The gas, which is initially at T1 = 294 K and P1 = 1x105 Pa, undergoes a...
  24. W

    Setting up systems of forces and free body diagrams

    Homework Statement Suppose I've got a static mass on a downward plane. (For instance a car on a drive way). How would you set up this free body diagram? Homework Equations F = f1+f2...etc The Attempt at a Solution My preference is A, but I've seen it displayed in examples in my book as B...
  25. D

    Exploring Closed Systems & External Forces

    Homework Statement apparently momentum is only sure to be conserved in a closed system - no external forces. So that means if a toy car collides with a wall then the total momentum efter won't be the same as before. That is because the wall would be joined to something else and ultimately to...
  26. F

    Design of Experiments Ideas - Control Systems?

    Hi everyone, I'm taking a Design of Experiments class which is focused on statistically designed experiments. I'm a bit lost for project ideas and this is my first graduate class. Would anyone have any ideas for an experiment that would have at least controllable factors that might have...
  27. A

    System call in operating systems

    In an operating system, system call is an interface to provide services to the user. Services include I/O operations, process management etc. Further, the C library provides me API above these system calls to make life easier. So printf, scanf internally use these system calls in the end. Q.) Am...
  28. S

    Geographic Information Systems or Geographic Information Sci

    Hello, Is anyone familiar with GIS? I'm thinking about switching for my BS then doing an MS or PHD. Does anyone know how these skills support other fields in the private sector or goverment? Also I want to do something 'sciencey'...so how 'sciencey' is it?
  29. E

    Religious and Secular Legal Systems

    Is it viable to use the law of religion under a secular court? Catholic priests aren't allowed to marry (which is under their religious law), and thus removing his right to marry, for example. So, if the priest were to file a case stating that he was not allowed to marry, is it sensible? Of...
  30. KingDaniel

    Systems Modeling - Sinusoidal Inputs

    Homework Statement Finding the complete response (steady-state and transient) is a long and laborious task. My lecturer's notes read (since at our stage of the course, we're mostly interested in the steady-state part of the solution and not so much the transient) : "The simple method for...
  31. KingDaniel

    Systems Modelling Question - Sinusoidal inputs (Important)

    Homework Statement Hi, When finding the steady-state response to a sinusoidal input, since "s" is a complex number, (a + jw), why do we substitute "s" with only the imaginary part (jw) in the transfer function, G(s) , to get G(jw), rather than substituting the whole complex number to get G(a +...
  32. C

    Heat, Pressure and Equilbrium in two separate systems

    Hi, I'm having a bit of a problem, and I'm not sure where to put the question. So here's a picture Sorry about the picture, Tank B should really be half-full of water and steam. Ignore the turbine part. I'm trying to create a distillation device and the basic idea I had was to have a boiler...
  33. V

    Typical examples of second order nonlinear dynamic systems

    Hi guys, after hours of searching internet I couldn't find much real-life examples of second order nonlinear dynamic systems (only tons of tons of equation and system theory... got totally frustrated). They will serve as a base process for modeling controllers. So far I found propeller pendulum...
  34. rizwanibn

    Understanding Sampling Period 'T' in Digital Control Systems: Tips and Tricks

    < Mentor Note -- thread moved to HH from the technical engineering forums, so no HH Template is shown > Hi. Please see question no. 1 in the attachment. If i take the inverse Laplace transform or the Z transform, how can i actually get the value of sampling period 'T'. or is there any other way...
  35. KingDaniel

    Engineering Systems Modeling Question (First order thermal circuit)

    Homework Statement I have a problem with understanding the thermal circuit I attached to this thread. Please help. It's a Thermal circuit of a computer CPU that needs to be simplified to have just 2 lumped capacitances and resitances. How would one go about doing that? along with the equations?
  36. JR Sauerland

    Systems of Equations: What's your favorite way to solve them?

    As the title suggests, I want the tips from the pros. I've learned all of the methods, but going into Calculus/Physics, which methods should I take preference to? Furthermore, will there be significant use of systems of equations in Physics or Calculus in college? P.S.: I know how to graph the...
  37. ranju

    Understanding Tapping in Power Systems: Exploring its Uses and Importance

    Homework Statement What is meant by the term tapping in power system , I studied in my textbook that generally from feeders no tapping is taken to the consumers , therefore current loading of feeder remains the same along its length. I was not getting what is being referred here ..?Homework...
  38. quantumfunction

    I Schrodinger's cat, the multiverse and isolated systems

    I know the debate about Schrodinger's cat is usually about things like consciousness but I want to talk about what it might say about isolated systems. Does the wave function of isolated systems remain in a superposition of observable states no matter how large the system gets? Say you have...
  39. B

    Is a Self-Powered Vibration Generator Possible?

    I'm fascinated by the prospect of them, but I can't seem to find much information/progress online aside from like small sensors which aren't quite the same thing. Has there been anything developed that is a self powered vibration generator? As in, it vibrates and then is powered by its own...
  40. R

    PT symmetry breaking in optical systems

    There are very results published about PT symmetry breaking in optical systems, with effects like anysotropical transmission resonance in waveguides. But if PT symmetry is broken in a optical system and CPT symmetry must always be respected, then what C symmetry is broken in a optical system?
  41. M

    How can I wire together two sets of computer sound systems?

    I want to purchase the Logitech z623 and add to it two creative inspire M2600 speakers (only the speakers, not the sub-woofer). The reason for doing this is because the Logitech system sounds really nice, it has an amazing bass, but mids and highs are not the best and I wish they was as clear as...
  42. B

    Communication systems -- Find the Modulation Depth....

    Homework Statement Hello, the plot in the image shows a modulated signal s(t), with one period of the modulating signal m(t). The mean value of m(t) is equal to zero . Its asked me to find the modulated index, the amplitude of the carrier, the equation of the message(m(t)) and the kind of...
  43. H

    Signals and Systems | Impulse Response Problem

    Homework Statement Find the impulse response for the systems governed by the following equations: 3y(t)'+5y(t)=x(t)+x(t)'[/B]Homework EquationsThe Attempt at a Solution I tried to obtain the homogeneous solution for h(t)[/B] and then I failed to obtain the coefficients of the solution
  44. pvvijaykumar

    How can you control devices remotely using wireless systems like USRP?

    How controlling a device is possible using wireless communications systems like software defined radio?
  45. C

    Underdetermined vs Overdetermined Systems

    I'm trying to create a model which is of the form y = (a0 + a1l)[b0+MΣm=1 bmcos(mx-αm)] [c0 + NΣn=1 cn cos(nz-βn)] In the above system, l,x and z are independent variables and y is the dependent variable. The a, b and c terms are the unknowns. To solve for these unknowns, I have two separate...
  46. Q

    Base excited stacked mass spring damper systems

    Homework Statement I'm trying to derive the equations of motion and state space as well as the transfer function for a system which has two mass spring damper systems stacked on top of each other. The system is base excited. I attached a pic of the system Homework Equations - Sum of the...
  47. ranju

    Number systems and binary codes

    Homework Statement Given (135)x + (144)x = (323)x. What is the value of base x? Now we can find out the value of x by simply converting to decimal both the sides , form a quadratic equation and solve but once in a random lecture our prof. taught us a kind of short method to solve this in less...
  48. andrewkirk

    Thermodynamic systems: spot the invalid fundamental equation

    Homework Statement In Herbert Callen's text 'Thermodynamics and an introduction to thermostatistics', 2nd edition, Problem 1.10-1 on page 32 presents ten potential fundamental equations of thermo systems, labelled (a) - (j), and asks the reader to identify the five that are invalid because they...
  49. X

    MHB Very basic binary/number systems questions?

  50. Erwin

    Exploring Qubits and Multiple Qubit Systems

    At first, good evening. I want you to know that Eng is not my first language, so you could find many errors while reading my posts. I was reading something about qubit and multiple qubit systems, which combined can create a powerful processor for a new type of computer. I'm not sure of how...
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