Systems Definition and 1000 Threads

Homework Statement I uploaded a picture of the problem here: http://imgur.com/kD35ROl Sorry about the norwegian text, the problem is this: The three figures with red lines indicate three different energy levels of a system in thermal equilibrium with a reservoir of temperature T. The three...

Hi everyone, as the title says, I am looking for a 3D cad to help visualise designs in piping systems and cut down errors. As a short background, I work in a small company which occasionally designs industrial gas pipings for pneumatic systems, gas delivery systems (to a lab, workshop, etc)...

Homework Statement Hey guys Concentrated photovoltaic systems are known for high efficiency performance compared to that of a standard solar panel. But, what's confusing me is the reason behind using lesser photovoltaic material in CPV systems. Can't we use the solar panel of the same size...

Homework Statement A white noise process W(t) with unity (N_0/2 = 1) power spectral density is input to a linear system. The output of the linear system is X(t), where X(t) = W(t) - W(t - 1) Determine the autocorrelation of X(t) and sketch it. Homework Equations Let τ denote a time...

Hello everyone, I'm a math and philosophy double major currently in my junior year at University. So far, I've spent the better half of two years studying philosophy and have five credits to go before I complete the major (focused primarily on philosophy of science, and epistemology). This...

If you look at Newtonian gravity, there is no major deal with coordinate systems. I am guessing we use coordinate systems because in general relativity we think of coordinate systems as different frames of references and that all frame of references must have the same laws of physics. Is that why?

Hello all I know that the step response of a second order underdamped system is : y(t) = 1 – (e^(-ζωn*t) / sin(θ))*sin(ωd*t + θ) Where sin(θ)= sqrt(1-ζ^2) , ωd = sqrt(ωn^2 – ωn^2 * ζ^2 ) my question is: I can see on the simulation ωd and I can calculate it , but I want also to see the...

Homework Statement Hi. i need help with understanding task with differentiation. i have two separate tasks, and i need help understanding why the solutions differ somewhat. system 1: Y = C + I + G C = f(Y-T) I = h(r) r = m(M) system 2: Y = C + I + G C = F(Y,T,r) I = f(Y,r) in system 1. when...

Homework Statement Given a system composed of a convergent lens and divergent lens (separation d between), how do I best calculate the focal length of the divergent lens? What is the best way to set up the system (converging lens first? diverging lens first?). There is plenty of documentation...

Hello guys, I need help solving this problem. Find the particular solution using method of undetermined coefficients: X'=AX + F(t) A= [4 ,1/3] <-- 1st row [9 , 6] <-- 2nd row F(t) = [-e^t,e^t] The complementary function is Xc=c1[1,3]e^(3t) + c2[1,9]e^(7t) Any help would be...

So I'm reading the Example on page 161 of Differential Equations, Dynamical Systems and an Introduction to Chaos by Hirsh, Smale, and Devaney. I'm not understanding everything. So given the system x' = x + y^2 y' = -y we see this is non-linear. I get it that near the origin, y^2 tends to...

Hi all. I'm really at a loss on how to find the "other" points of intersection for this system of equations: x^2-y=4 x^2+y^2=4 Obviously we have a parabola and circle. I have solved for x and got "2", and plugged that back into get "0". However the answer has 4...

Talking about banks, credit cards, card swipes, ATM machines...stocks/wallstreet all that stuff, is it C/C++ that is generally used?

Homework Statement Hello! I've been really unsure of whether my solutions to the first problem and part (b) of the second are right. My book gives few examples and so I've been trying to look on other websites for resources. Sorry if this is a lot, but any and all help would be appreciated...

Hello Is the principle of minimum action applicable to nonholonomic systems? Why? If this question is already answered in this forum, just tell me, and I will delete this thread. Thank you for your time :) Greetings PS: My mother language is not English, so I'll be glad if you correct any...

Homework Statement Hi guys I am new here and i really need help with this question. I've tried it multiple times but can't find all the critical points, help would be greatly appreciated. the question is as follows: Find the maximum and minimum values of w=4x-(1/2)y+(27/2)z on the surface...

Homework Statement Homework Equations f_spring = k(x_near - x_far) The Attempt at a Solution a. FBD: The force goes through the nodes, and the sum of the forces must be 0 because the nodes are massless. Therefore, kx_1 = x(t) So x_1(t) = x(t)/k b. FBD: For this system, the parallel...

how do i write vectors in polar coordinate? And what will the azimuth coordinate represent? I was trying to figure out the vector connecting a ring to its center using polar coordinates, so that i would perform an integration over d(phi) (finding the electric field due to a semicircle at the...

I've been grappling with this problem for a long time, but I think someone on this forum may know about this. Minimizing the joint number of products of a system of boolean equations is well-studied, and has various software implementations. Those are the Quine-McCluskey and Espresso...

<< Moderator Note -- thread moved from the EE forum to the HH forums >>[/color] Hi I am doing a HW assignment for my control systems and I just need some clarifications on some concepts so i can solve the problem. This is the current problem I am working on. 36) (Homework 4 Problem 2 –...

Homework Statement A uniform bar ABCD having a mass of 4.25kg is pivoted at B shown in Figure below. The bar ABCD is supported at A and D by springs having stiffness’s of 12kN/m and 2kN/m respectively. A torsional spring of stiffness 100Nm/rad is also present at the pivot B and a damper is...

need a good book on topology and metric spaces! I'm an undergrad taking a course on non-linear dynamical systems, just realising my pre-knowledge is slightly under the requirement since I have not taken any course on topology. I only know basic real analysis and some complex analysis. so any...

How to culculate neutral current in three phase system with unbalance load?

Homework Statement In my dynamics modelling class, the professor went over an example where we linearize non linear state equations to approximate the behavior. In this case, we are not given an operating point. However, the professor said you can solve for the operating point by setting x' =...

I am finding some topics a bit obscurely explained. I have attached the curriculum/study guide we are using, and was hoping someone could suggest books which cover these bases. Particularly finding week 8 a bit difficult at the moment, especially stability (surely just more robust revision and...

I am an EE graduate stumbled upon this exciting new field of research fusing control and estimation theory(EE) and quantum mechanics(Physics). I seeking opinion of experts and professionals regarding this field.I think it would be critical for development of new future quantum technologies and...

Hello all. I have a doubt about the derivation of energy in dielectrics formula (Griffiths pages 191 - 192). In a certain step of the formula derivation, we encounter the following operation: (view formula below). I do not undertand that operation. Can someone help me?

OK. A problem is simple and probably very stupid... In many (most of) maths books things like Euclidean metric, norm, scalar product etc. are defined in Cartesian coordinate system (that is one which is orthonormal). But what would happen if one were to define all these quantities in...

Hey everyone, hopefully this is the right place to post this. I'm going into an undergraduate program in January, and I've been leaning towards the interdisciplinary program of systems engineering. I was wondering if anybody has had experience in this field? I would imagine it would be a...

hello friends I have to submit project in class within 3 months my guide told me you have to make project on embedded system (major project ) quality of project 1) idea should be new 2) we can modify old project 3) project should have multiple use 4) project should be...

I am trying to understand the (possible) couplings between scalar chemical reaction phenomena and vectorial phenomena such as heat conduction and mass diffusion. It is argued in the literature that I have read that the usual assumption of cross coefficients for scalar+vectorial phenomena only...

Hello all, would like to ask what seems to be a general rule when designing power systems. In the power system design program which I just started to use. It is advised that: For every simulation to be run, it is best to have a "flat start" before running any faults. I'm not too sure...

Homework Statement Tell whether following systems are i. linear and ii. time-invariant: $$y(t) = \int_{-\infty}^t x(\tau)d\tau$$ $$y(t) = \int_{0}^t x(\tau)d\tau$$ $$y(t) = \int_{t-1}^{t+1} x(\tau)d\tau$$Homework Equations N/AThe Attempt at a Solution I'm a little thrown off by the integrals...

Hi, how can I compute the general solution of a system of linear equations? Non-square systems for example. I have the book Linear Algebra via exterior products, but it is the worst book in the history of math books, I think I'll burn it somehow, whatever. I can calculate the solution with the...

Homework Statement As shown in the image below, can I use 2 different co-ordinate systems when drawing the free body diagram for each object? Homework Equations The Attempt at a Solution

I'm trying to do some refreshing of differential equations featuring damped systems. Specifically, I have a question regarding the differential equation solution to an under damped system involving complex roots. Referring to the attached pdf, an under damped system will yield a complex...

Many modern cars now employ radar systems for intelligent cruise control as well as blind spot monitoring. Can the radar waves that are reflected back to the vehicle for these applications pose a health hazard to the vehicle occupants?

All chess rating systems including the Elo rating system are based on a procedure called "scoring" which assigns a score of 1 for a win, 0 for a loss, and 1/2 for a draw. This procedure reduces the trinomial nature of chess game outcomes to a binomial variable and thereby greatly simplifies the...

what is the best software to calculate power losses in a distribution system?

In almost every textbook I have seen, pressure is said to be one of the most important state variables of a thermodynamical system. But if the system is three-dimensional and on planet Earth, it is not constant! This problem, however, is neglected in every reference I consulted. It seems to...

Hopefully this is in the correct section. I'm studying systems engineering and I'd like to know a typical day in the life of such. I've done some research but I can't quit assume what a working day would involve and perhaps, generally, what I can focus on. * What sort of projects are worked on...

I have always been wondering that why there is only one commercial operating system which is Microsoft Windows whereas there are a lot of commercial cars, computers, publishers. Best Regards.

Having recently taken up road downhilling, I want to investigate the feasibility of producing a personal, wearable thrust driven propulsion system. Doesn't have to be terribly powerful, controllability should be via twistgrip maybe. I'm drawing pictures of an ergonomically-designed frame which...

Hi, thanks for stopping by :) This is for a big assignment (Yr 12). I asked my physics teacher this, but she couldn't give me a definite answer, and neither could my music teacher who previously studied physics, and then he messaged an engineer he knew, who hasn't replied yet... ~ Given...

Homework Statement When a 50-kg mass on a pulley is allowed to drop, the friction in the pulley creates a constant 200 N force upward. What is the tension in the rope? Homework Equations F (upward) = F (downward) The Attempt at a Solution I attempted this problem by assigning the...

Casual talk. Constrained Hamilton systems. Dirac-Poisson brackets. Casual talk. Constrained Hamilton systems. Dirac-Poisson brackets. Hi guys, I think I have finally succeeded in understanding the ideas which Dirac explained in the two first chapters of his book "Lectures on Quantum...

During the course of working with inertial measurement units (IMU) I have run into a problem. The issue is that an IMU reports accelerations relative to the IMU's orientation rather than it's initial orientation. The IMU's initial orientation is the identity quaternion (1,0,0,0). All changes...

Hey guys! I am in community college, and this will be my first semester. But I am basically confused in making perfect choice for my major. And the reason is I am good at Math, but bad at Chemistry and Biology. Following are the courses required to obtain an Associate degree in respective...

Just a quick question. Let A and B be two points. Electrical work is defined as the amount of energy it takes to move an amount of charge Q through a potential difference VB-VA (for our purposes here, we will assume that the voltage values are measured with respect to an Earth ground) and is...

Hello all, I am currently studying as an EE and realized I messed up something with my career path. I am not sure if it possible to get an internship at a company for primarily DSP if you haven't taken a DSP class? If not, things could be mended if it were possible to take circuits 2...