Systems Definition and 1000 Threads

  1. H

    What is the Relationship Between Entropy and Order in Physical Systems?

    In my TD classes I have to deal with entropy. But what does it really mean? I know that it is the degree of disorder and the equation S=q/t. But what is this disorder? How can a physical system be aware of order and disorder since it is an abstract concept?They say that solids have high order...
  2. I

    The correlation between AI and C.V. to these automation systems

    I want to know how the artificial intelligent become integrated or can improve more automation systems and machine that build in automatic way Display screen, solar cells, lithium ion batteries, printed circuit boards and 3D printers. I know that these automation systems and machine are...
  3. S

    Perturbation Techniques and Theory for Nonlinear Systems

    Homework Statement Given the equation \ddot{\theta}=\Omega^2\sin{\theta}\cos{\theta}-\frac{g}{R}\sin{\theta} Determine a first-order uniform expansion for small but finite theta. Homework Equations Other than the equation above, none so far as I am aware. The Attempt at a...
  4. F

    Control Systems, Reduction, Stability,Characteristics and Overshoot

    Homework Statement Welding robot is defined by the block diagram attached/ excuse the paint work. (hope that worked) find: a)maximum value of K required to achieve stability. b)roots of the characteristic equation, at half the maximum K value. c)estimated percentage overshoot, if the...
  5. Z

    Riemann Hypothesis for dynamical systems

    what are teh differential equations associated to Riemann Hypothesis in this article ?? http://jp4.journaldephysique.org/index.php?option=com_article&access=standard&Itemid=129&url=/articles/jp4/abs/1998/06/jp4199808PR625/jp4199808PR625.html where could i find the article for free ? , have...
  6. I

    Automation Systems: Machines for Solar Cells, LCDs, Batteries, Fuel Cells & PCBs

    I am interesting to know about the automation systems (production line) and the machines that manufactures these products: solar cells, thin-film solar modules, display screens like: Liquid Crystal Display (LCD), touch panel and plasma, thin film rechargeable lithium ion batteries, lithium ion...
  7. N

    Stability of two systems in series (Controls Engineering)

    Hi everyone, one my textbook there is written (if two system blocks are asintotically stable and are in series, their product will be asintotically stable), but I've heard that sometimes the transfer function of the controller could be not asintotically stable in some cases (see p.i.p...
  8. D

    Transfer Functions: Why Input Must Match Output in Control Systems

    Why should the input follow the exact output in control systems (Transfer function). What if my system is an amplifier ? shouldn't that means that the output is the input * gain ? I can't understand the differences between dealing with a real system ( such as an amplifier) of dealing with a...
  9. P

    Problem regarding conservation of momentum in different systems

    Homework Statement A bullet of mass m_{1} with initial horizontal speed v_{0} hits a wooden block of mass m_{2} initially at rest on an incline of angle β and embeds itself into the wooden block, how far up the incline will the bullet and block travel? Homework Equations \bar{P}_{initial} =...
  10. M

    Determine the unit-step response of the discrete-time LTI systems

    Determine the unit-step response of the discrete-time LTI systems described by the following impulse responses: h[n]=(0.9)^{n}e^{j(\pi/2)n}u[n]So I am completely confused. . . I don't even know how to start. . . I want to say that I need to do a summation but the more examples and text I look...
  11. Astronuc

    Nuclear Systems Volume I by Neil E. Todreas, Mujid Kazimi

    Author: Neil E. Todreas, Mujid Kazimi Title: Nuclear Systems Volume I: Thermal Hydraulic Fundamentals, Second Edition Amazon Link: https://www.amazon.com/dp/1439808872/?tag=pfamazon01-20 Prerequisities: Junior (3rd year uni) level courses in Nuclear Engineering, Mechcanical Engineering...
  12. S

    Binary Star Systems: Radial Velocities, Observations & Unresolved Eclipses

    Homework Statement Angular separation of stars 1.5 arcsecs Parallax 0.0050 arcsecs Apparent vis magnitude 2.5 (star a) and 7.5 (star b) The two stars may be in orbit about each other in a binary system, or may be separate stars viewed by chance in almost the same direction in the sky. (i)...
  13. S

    Integer Solutions to Linear Systems

    Homework Statement We were asked to solve it using Augmented matrix. I just need one more equation though. A jar of coins contains only dimes, nickels, and pennies. There are 98 coins in the jar, and the total value of the coins is $6.49. Set up the system of equations representing this...
  14. ShayanJ

    Vectors in curvilinear coordinate systems

    To specify a vector in cartesian coordinate systems,we assume its tail to be at the origin and give the cartesian coordinates of its head.What about other coordinate systems? For example,in spherical coordinates,is the following correct? a \hat{x}+b \hat{y}+c \hat{z}=\sqrt{a^2+b^2+c^2}...
  15. N

    DSP involvement in Power Systems (help need for Master thesis)

    Hello. i am searching for a topic for my Master Thesis. My Master is on Power Systems and i want to combine my thesis with digital signal processing. but i am stuck on finding a topic. So if anybody can helping choosing a subject or giving me some ideas that i can work on? Best regards
  16. R

    Hardware based data acquisition systems

    What does hardware based processing mean? ENIAC does hardware square rooting but what is the classification here? Is it like assembly code and C code difference?
  17. D

    Systems solving with no solution, unique, and infinite solutions?

    Homework Statement Find the values of k in the following system of linear equations such that, the system has no solution, the system has a unique solution, and the system has infinitely many solutions. x+y+2kz = 0 −2x−y+6z = −3k −x+2y+(k2 −3k)z = 9 Homework Equations The...
  18. C

    Thermal Stress and Spring Systems

    The rod is made of A-36 steel and has a diameter of 0.25 in and a length of 4 ft. Attached to each end of the rod is a spring which is fixed to a wall. If the springs are compressed 0.5 in. when the temperature of the rod is T=40 F, determine the force in the rod when its temperature is T=160 F...
  19. J

    I don't understand conservative systems

    Homework Statement Look below. Homework Equations So my book says that you have a conservative system when E'(t) = [(1/2)m(x'(t))2 + V(x(t))]'(t) = 0. It gives an example of V(x) = -(1/2)x2 + (1/4)x4, whence setting y = x' gives E = (1/2)y2 -(1/2)x2 + (1/4)x4. According to the book, E...
  20. I

    Controllers, processors and operating systems in the car

    I search after information in these things: I think there are a lot of controllers and processors in the car but in which devices in the car they are and what them doing in these devices? What are the operating systems in the cars? What is algorithm for robust control?
  21. J

    For Statics:Simple Systems of Equations to Solve Equilibrium Problems

    Homework Statement I have a picture attached with this static equilibrium problem. (Solve system for Fac and Fab) Homework Equations Sum of x and y both=0The Attempt at a Solution I just don't have a systematic easy approach to solving these systems. Does anyone have one? From the picture...
  22. M

    The consistency of linear systems

    Homework Statement What conditions do x, y and z need to fulfill for the system of equations to be consistent? Homework Equations 2a + 3b + 5c = x a + 3c = y a - b + c = z The Attempt at a Solution Not quite sure. The notion of consistency was never discussed in class, nor is it...
  23. A

    Conservative forces and systems

    I read in a book that if the constraint forces do work, the system is conservative, else it's nonconservative. In that case, consider a system of two bodies moving in an elliptical path under gravitational attraction. Since the gravitational force is continuously doing work on the particles, by...
  24. M

    Laplace and Systems Control and Analysis

    Using Laplace can someone please show me in simple terms how i would solve the following function? This is a lecture example. The solution just shows the answer, nothing about how we get it or what it represents. I am finding this subject particularly difficult to come to grips with. δ(t-1)...
  25. L

    Want a book/notes that cover this syllabus (dynamical systems).

    I am looking for a book that covers these topics at a self-contained level for self-study (ie: a book designed for a short course on the subject or lecture notes): Things in bold are of most interest to me. I notice there are a lot of pure math books on this subject but I'm looking for...
  26. Jameson

    MHB Cammie's question from Facebook (finding a mixture through systems of equations)

    A girl scout troop has 20 pounds of candy worth 80 cents per pound. the troop wishes to mix it with candy worth 50 cents per pound so that the total mixture can be sold at 60 cents per pound without any gain or loss. how much of the 50 cent candy must be used? Solve by elimination.
  27. N

    Thermodynamic Reversible/Irreversible Closed Systems

    I am completely lost with this problem. How would I go about breaking it up into manageable components that so I won't get lost in the problem? Homework Statement A 2 m3 rigid storage tank containing 10 kg of steam is heated from 300 to 400 C by transferring heat from a hot reservoir at...
  28. H

    Mind blown by mechanical systems (2nd order)

    Homework Statement B, K, M Homework Equations 1. xs(t) -----spring ----mass-----damper-----fixed, derive DE for x of mass given :2. F - > M -----spring-------damper ---- fixed in series, derive the DE for velocity of spring The Attempt at a Solution 1. ma = -k(x-xs) -...
  29. V

    Delayed power on to multiple systems with a single switch?

    Hey gang, I am trying to figure out a solution to a small problem i have.. and it is probably really simple, especially to you guys. I want to be able to power on a series of monitors and then a PC, with a small delay, by turning the main power switch on. To give a better...
  30. B

    Control Systems Engineering : Response of a system to a Harmonic Input

    Homework Statement In my notes it is stated that an integrator adds a phase lag of -Pi/2 and thus can cause instability. I want to understand what this really means and am deviating from the notes somewhat so do not know if I am barking up the wrong tree. Homework Equations Given a...
  31. M

    First and Second Order Systems - Classical Analysis

    This was a lecture example and it has confused me. Can someone please help explain it? If we have the following fist order system: τ.dx/dy+y(t)=x(t) where τ=c/k where "k" is the spring stiffness and "c" the linear damper coefficient and τ is a time constant. For the unforced case x(t)=0, we...
  32. B

    Control Systems Engineering : Masons Gain

    Homework Statement Here is the system I am looking at Homework Equations So I worked out a formula for the steady state error and put it in a form similar to masons gain formula The Attempt at a Solution But when I try and draw a block diagram and work out e I get...
  33. F

    Linear Algebra - Linear Systems and Matrices

    Homework Statement Suppose we know that a linear system Ax = b has a unique solution. What can we say about the solutions of the linear system Ax = 0? a) It has the same solution. b) The solution to Ax = b is also a solution to Ax=0, but there may be other solutions. c) Ax = 0 has a...
  34. A

    Impulse Response of Causal Systems

    I am reading "Linear System Theory and Design" by Chen and he says (in what follows g(t,tau) is the impulse response function): If a system is causal, the output will not appear before an input is applied. Thus we have Causal <==> g(t,tau) = 0 for t < tau. However, this seems incorrect...
  35. A

    Which Book is Best for Engineering Signals and Systems?

    What is the best book out there for Engineering Signals and Systems? One that is clear & easy to understand and has many different problems with solutions. The book I am using has no solutions and there is no way to check my work. I hope someone knows a similar book...
  36. Z

    How Do You Calculate the Moment in a Force-Couple System at a Pivot Point?

    Homework Statement A force F of magnitude 50 N is exerted on the automobile parking-brake lever at the position x=250 mm. Replace the force by an equivalent force-couple system at the pivot point O. Picture: http://i.imgur.com/dJGtvAo.png Homework Equations M=F*d The Attempt at a...
  37. Mandelbroth

    Logarithms in Systems of Equations

    Homework Statement Consider the system... y=e^{-x}+1 \\ y=2+lnx The Attempt at a Solution I don't think there is a "pretty way" (algebraic manipulation) to do this. I simply found the point where the plots intercepted, getting the solution set (0.62745018..., 1.5339409...). Is there a...
  38. Greg Bernhardt

    Classical What Topics Are Covered in Classical Dynamics of Particles and Systems?

    Author: Stephen T. Thornton (Author), Jerry B. Marion (Author) Title: Classical Dynamics of Particles and Systems Amazon Link: https://www.amazon.com/dp/0534408966/?tag=pfamazon01-20 Prerequisities: Calculus, Ordinary and Partial Differential Equations, Introductory Physics Level...
  39. M

    Examples of systems that generate C-EMF?

    Hi,Do you know systems that generate C-EMF? Set ups like an Electric Motor? What other system do you have in mind? Another thing. I know that CEMF is caused by a changing electromagnetic field. How can an electromagnetic field be changed? Please elaborate! Miyze,
  40. E

    Thermo Question: The math behind systems in thermal contact

    Hi! I am reading Molecular Driving Forces, 2nd ed., by Dill & Bromberg. On page 53, example 3.9, we consider why energy exchanges between two systems from the point of view of the 2nd law. We consider two separate systems. Each has ten particles, and each particle has two possible energy...
  41. S

    Software to solve Nonlinear Systems (ineq and eq)

    Hi everyone, I've got an optimisation/computing question. I have a system of nonlinear equalities and inequalities, which I've written below for reference. It's the conditions for a minimiser of a Karush-Kuhn-Tucker problem. Would anyone be kind enough to explain how I could use software to...
  42. D

    Can 2D Systems Simplify Path Integrals in 4D Minkowski Space?

    The combination of special relativity and quantum mechanics in a single framework makes our understanding of such systems to be true only in 4D, Minkowski space...I have noticed that recent published work concerning 2D systems and I am not sure about this reduction of 4D to only 2D, does it mean...
  43. R

    Residual Gas in High Vacuum Systems

    Homework Statement What is the likely main residual gas constituent of a high vacuum system (HV) (P~1x10-4 Pa) and where does it come from? Explain how the vacuum may be improved to give ultra-high vacuum (UHV) (P~1x10-8 Pa). What is the likely main residual gas constituent of ultra-high...
  44. P

    Solve 3x-y+2z=4 - Help for Newbie

    am not a math guru :P,am a newbie even if this should be solved by a newbie as well, Id like u guys to help me out to solve this one : 3x-y+2z=4 Im really needing this, thank you all.
  45. O

    MHB Calculating partial derivatives in different coordinate systems

    let f = x2 + 2y2 and x = rcos(\theta), y = rsin(\theta) . i have \frac{\partial f}{\partial y} (while holding x constant) = 4y . and \frac{\partial f}{\partial y} (while holding r constant) = 2y . i found these partial derivatives by expressing f in terms of only x and y, and then in...
  46. U

    Can a Function in Polar Coordinates Fail in Cartesian Coordinates?

    Hi all. What does it mean that a function in polar coordinates may not be a function in Cartesian coordinates? For example, r(\theta) = 1 + \sin\theta is a function because each \theta corresponds to a single value of r. However, in Cartesian coordinates, the graph of this function most...
  47. nukeman

    Regards to chemicals/drugs: How do delivery systems work?

    Hey all, How do drug delivery systems work? Lets say I have a drug that I want to test out, let's called it DrugX. Now drugX will not work by it self because there is something in the body that kills it right away, or it can't bypass the bloodbrain barrier. Now, I have this chemical...
  48. S

    Nonlinear Systems & Weighted Sum of Impulses

    Hello, my question is that almost all textbooks say that a linear system will give the output to a weighted sum of impulses which equals the superposition of scaled responses to each of the shifted impulses. But if we apply the same input which is a weighted sum of impulses to a non linear time...
  49. S

    Is Signals & Systems Memoryless/Linear?

    1) y(t)=dx(t)/dt Is this system memoryless? 2) y(t) = 0 if x(t)<0 x(t) + x(t-2) if x(t)>=0 Is this system linear? Thankyou :)
  50. H

    Understanding the Contradiction: Spin Rotation in Quantum Systems

    This has been a contradiction in my brain for some time. If I want to rotate one nuclei (spin 1/2), with say an applied magnetic field B and RF pulse (at the appropriate larmor frequency), how does the spin actually rotate? I thought it can only take on discrete values of 1/2 or -1/2...
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