Systems Definition and 1000 Threads

There are two basic types of horizontal stabilizer systems on most general aviation aircraft. Horizontal stabilizer with elevator, and or horizontal stabilator. If the horizontal stabilator system that is on most piper aircraft and some high performance fighter aircraft, then why are so many...

While reading about whispering gallery modes, I have learned that whispering gallery modes can be seen for "microscopic spheres or toruses" -Wikipedia- , But can they practically be observed in relatively large prisms or glass spheres (m or even cm magnitude) ?

I am interested in learning how to design embedded systems. I have a solid background in high level C++ (primarily for modelling and visualisation), but my knowledge of computer hardware is somewhat limited. I am interested in starting an embedded system design project to educate myself on the...

Systems and Signals questions---plots Homework Statement Problem: Express the bottom 5 plots in term of x(t) (the top plot) with its time shift, time scale, time reverse and superposition properties. (see attached picture) Homework Equations The Attempt at a Solution I have...

Homework Statement I'm trying to find \frac{V_{Load}(s)}{I_{Dist}(s)} using Mason's rule. I was able to solve for \frac{V_{Load}}{I_{Cf}(S)} using Mason's rule but am not sure how to solve for \frac{V_{Load}(s)}{I_{Dist}(s)}. http://imageshack.com/a/img31/4299/zr5.PNG Homework...

1. Unit mass of a fluid at a pressure of 3 bar, and with a specific volume of 0.18 m3/kg, contained in a cylinder behind a piston expands reversibly to a pressure of 0.6 bar according to the law p = c/v2, where c is a constant. Calculate the work done during the process. 2. P1V1=P2V2 3. I know...

Homework Statement x + 3y + z = 4 2x + 2y + z = -1 2x + 3y + z = 3 Find the general solution, and two particular solutions. The Attempt at a Solution y = 4; x = -1; z = -7; if I am not mistaken. So how am I supposed to find a general and two particular solutions if there is only...

Hi there, I'm currently researching for a Product Design project and was wondering if anyone had any insights into electronic braking systems. Are there any current systems being used on general automotive vehicles at moment? E.g The brake pedal represents the pressure of braking...

I recently started working at ABB as a engineer. I wish someone here could help with some questions: 1) In a single phase IT system, why does the circuit breakers have to be bipolar? I believe it is because of a second fault occurence, but i don't really understand what happens. 2) If you...

I am currently undertaking a HND in Electrical Engineering and for my graded unit project I have chosen 'Power quality in renewable energy systems'. I was hoping someone could recommend a good book to help. Thanks

I'm trying to solve this equation analytically, but I can't even find the auxiliary equation or general solution! Km = 0.5 C*e = 0 K2 = 0.03 K1 = 0.05 x* = 49

Homework Statement Find the transfer function, G(s) = \frac{V_{0}(s)}{V_{i}(s)} for each network shown in figure P2.3. [Section 2.4] http://imagizer.imageshack.us/v2/800x600q90/20/1ocq.png Homework Equations The Attempt at a Solution When I try and solve this problem I...

Recently I've been studying about orthogonal coordinate systems and vector operations in different coordinate systems.In my studies,I realized there are some inconsistencies between different sources which I can't resolve. For example in Arfken,it is said that the determinant definition of the...

In a coordinate system two axes are inclined at an acute angle θ. Is this coordinate system different from a coordinate system in which the axes are inclined at an angle (180 - θ)? if we look at the four quardents in either of the above set of axes, both are included giving the impression that...

Apologies if this seems a bit trivial, but I was hoping to clear up a bit of confusion that I'm having. First Question: When considering an N-particle quantum system, described by some wave-function, \Psi\left(\vec{r}_{1},\ldots,\vec{r}_{N}\right). Is it correct to consider each particle to...

In working with chilled water system, why do we install "double regulating valve" and "2 way valve" when connecting the pipe to the AHU ?

Hi. I don't understand how a solution to a linear system is obtained (for example geometrically; don't consider the substitution method and elimination), and I am feeling very frustrated. Say I have the following equations: y = x + 5 b = 2*a (the relation remains the same even if I change...

Two caveats: One, I may or may not be posting my questions in the correct section of this forum. If not, then please kindly direct to where I should post it. Two, I studied English in college. I am not entirely ignorant of the sciences, but they are certainly not my area of expertise...

Can anyone recommend a company in the Cambridgeshire area that offer a full hydraulic service including bespoke design, supply, installation, testing and commissioning of hydraulic control systems and solutions and systems that have been used for standard and high risk applications including...

Signals and Systems Vs Circuits I I really just would like to know which course, in your opinion, was more difficult circuits I or signals? I've already taken circuits and signals is up next. Also, what should I be reviewing in order to prepare myself, during the break, for Signals and...

Homework Statement Find a topological conjugation between g(x) and T(x) where g and T are mappings (both tent maps [graphically speaking]) Homework Equationsg:[-1, 1] → [-1,1] g(x) = 1-2|x| T:[0,1] → [0, 1] T(x) = 2x when x ≤ 1/2 and 2(1-x) when x ≥ 1/2 h ° T = g ° h (homeomorphism)The...

Hi friends, I search after examples or videos or names of robots or machines that work in a very accurate scale something like one millimeter of accuracy or better accuracy, so if you know about a robot or machine that work very accuracy so I will glad if you can write this in this thread.

Can anyone recommend a company that provide advanced control systems for marine and civil engineering in the Cambridgeshire area? Thank you

Hi Fellow Members, I am a bit confused about delocalization concept. Since, in organic chemistry we have been told that delocalization only exits between conjugated systems but in inorganic chemistry there is delocalization of electrons in metals with no double bonds. Isn't it...

Homework Statement A cylinder fitted with a piston contains air at 1.0 Bar and 17°C. The gas is compressed according to the law PVn = const., until the pressure is 4 bar when the specific volume is found to be 28% of the initial value. Heat is then added to the air at constant pressure until...

Hey! I need some help using the Matlab function ljx.m for solving a system of linear equations. I found a solved example for A= \bigl(\begin{smallmatrix} 1 & -1 &0 & 1\\ 1 & 0& 1 & 0\\ 1 &1 &2 & -1 \end{smallmatrix}\bigr) and b= \bigl(\begin{smallmatrix} 1\\ 1\\ -1 \end{smallmatrix}\bigr)...

Other than ZFC, what other axiomatic systems have been shown to be useful to the real world? I'm a layman that is reading through the Wikipedia articles and it seems like the axioms are becoming more Philosophy than Math. We can use a different axiomatic system other than ZFC, but are there...

Dear all, I'd like to specify meaning othe relaxation phenomenon on example in some classical system. For example in Wiki I found example of dampled oscilator where the relaxation time ( the time is needed for the system to return to the equilibrium fluctuation pattern) add exponential decay...

Does the ground wire used in transmission/distribution systems also serve as a neutral wire in some cases or is it used only to protect the conductors against lightning strikes?

I'm doing quadratics and I broke down some data into 8 systems of equations and I was wondering what the best way to solve this was. Someone online mentioned doing Gaussian Matrix but I don't know what that is. Any suggestions?

OK, before I get into the main question, I figure I should give a little background. First off, this is not something that is going to be made for real. It's for a flight simulator called Orbiter (found here), and in particular for a personal project to update and improve upon the existing...

Hello, I am taking intro Physics and we are having a little quiz this friday. Professor gave us handouts and told us to solve them by ourselves, and then study those problems because the same problems will be on the quiz. Now, my problem is, is that I really don't understand the subject...

A resistor and capacitor are in series. The signal is at 3 herts and a passive filter must be used to remove a 60hz noise with -10db attenuation. The resistor is 100 Ohms. HOw do you find the capacitance, I've been tryin it for an hour. Usually you would find it with the corner frequency but...

Been reading some Dover books (topology, ODE:s, complex variables) and I think they've been just brilliant so far. I'd like more books in the same vein on other subjects. Most engineering books are absolutely awful in my opinion (books in the style of Merriam/Kraige mechanics - utterly...

How do we know that the work-energy theorem holds for variable mass systems? Or rather, since I'm sure that we can at least know it to be true experimentally, what is the mathematical basis for the work-energy theorem? I know for fixed mass systems, a rather simple derivation comes from...

Hi all, I just want to see if my work is correct because it's not matching the answer in the book: A tank has a volume of 0.1 m^3 and is filled with He gas at a pressure of 5x10^6 Pa. A second tank has a volume of 0.15 m^3 and is filled with He gas at a pressure of 6x10^6 Pa. A valve...

Okay, so I'm at conundrum with my physics textbook and I cannot seem to understand a few concepts. Allow me to elaborate. 1. Why is the total momentum of a firecracker sliding on ice the same before and after it explodes? Shouldn't the explosion cause the momentum to increase since the...

Hello again, I have a few more questions regarding systems of equations, I will collect them all here in one post since they are small. 1. The first is the following system: x+2y-3z=a 3x-y+2z=b x-5y+8z=c I need to determine the relation between a,b and c for which the system has infinite...

Homework Statement a) A light-source at rest in an inertial system S' is emitting light with angle θ' relative to the x'-axis. The System S' is moving at speed v (along the x-axis) relative to the laboratory system S. Show that the emitted light is making an angle θ with the x-axis of...

I have been given a topic called 'Protection schemes for hybrid power systems' as an assignment and i have to prepare for a seminar on it. Can anyone help me with what the topic means as in is it electrical protection or physical protection and so on? Can you also please give any info regarding...

Hey all, I was feeling confident with the idea of work when dealing with vectors and using the dot product to find the work. However, recently we have begun to discuss work while considering the object experiencing the force as part of a system. I'm having trouble transitioning into this idea...

## \vec{r}=\rho \cos \varphi \vec{i}+\rho \sin \varphi \vec{j}+z\vec{k} ## we get \vec{e}_{\rho}=\frac{\frac{\partial \vec{r}}{\partial \rho}}{|\frac{\partial \vec{r}}{\partial \rho}|} \vec{e}_{\varphi}=\frac{\frac{\partial \vec{r}}{\partial \varphi}}{|\frac{\partial \vec{r}}{\partial...

Can someone provide me with a general understanding of the steps involved in completing this problem. How do I get started? Calorimetric data on triethylamine (EA)-benzene (B) solutions at 298.15 K were obtained and follow the following expression: Hmix – [xBHB + (1 - xB)HEA] = xB(1 -...

If a person gets a phd studying controls theory, shouldn't they have the skills (as a researcher) to publish electrical engineering research one year, economics the next year, and biology the next? Since someone that studies "systems" generally works in high abstractions, I don't see why the...

Give the correct tension, T, in the marked rope for each situation. The rope is held so the system is stationary. All ropes and pulleys are massless and frictionless. Follow link for a picture of the pulley systems: http://i.imgur.com/2eBZpC3.jpg A) T = W B) T = W/2 C) T = W/3 D)...

Homework Statement Find all the values of h and k such that the system: hx + 6y = 2 x + (h+1)y = k has: (a) No solutions (b) A unique solution (c) Infinitely many solutions Homework Equations - The Attempt at a Solution I've tried putting the system into echelon form and got...

I need help understanding why in problems tension is modeled as T-mg = ma. I understand there are different variations, but the main concept is what I need help with. For example: If i have 2 masses hanging off a pulley (m1=5kg & m2=10kg) then m1 has a downward force of 49N down. The...

It seems that many systems currently studied, are very fragile to dechorence. Great care is taken to isolate them from even the smallest amount of interatction with the outside environment. Yet, the most well known quantum mechanics experiment, the double slit experiment, seems incredibly...

So I have a question or two that I've wondered about for a while and am hoping that this is the right forum to (maybe) get some answers. The thing I've been wondering about is how important the visualization process is in dealing with more abstract, theoretical problems, especially as it...

I am currently working through Griffiths' textbook on quantum mechanics. The hydrogen atom was first modeled as a one body system with the proton fixed at the origin. In this case the potential was given by Coulomb's law, V(r) = -\frac{e^2}{4\pi\epsilon_0}\frac{1}{r} \ , where r is the radial...