Systems Definition and 1000 Threads

Hi all, I'm in a bit of a dilemma. I have an opportunity to take Signals and Systems over the summer. However, I have not taken Differential Equations yet. A course on Electric Circuits is a prerequisite for this class and I ended up taking that last semester without any DE knowledge LOL...

There is an article I am reading, http://authors.library.caltech.edu/38643/1/PhysRevLett.110.174301.pdf I don't quite understand a lot of where this guy is coming from. I do not have much background in Lagrangian and Hamiltonian formulations, but it is vital that I can formulate some sort...

My book describes a linear system with "m equations in n unknowns." Maybe this is a subtle detail but this confuses me. Shouldn't it be the other way around, "n unknowns in m equations?"

Hi! I want to write a code in Matlab for the Backward Euler Method for 2x2 systems, using the fixed point iteration to find the yn+1. y1n+1=y1n+h*f(tn+1,y1n+1,y2n+1) (1) y2n+1=y2n+h*g(tn+1,y1n+1,y2n+1) (2) Could you tell how I use the fixed point iteration?? At (1) the fixed point iteration...

Previously, before getting into relativity, I've always thought of a 'reference frame' of basically an "observer carrying a coordinate system" - where I thought of an observer as anything which could record information of positions and velocities of particles etc. Now, however, I'm reading a...

Homework Statement A boy finds £2.10 in 20p, 10p and 2p coins. If there are 17 coins in all how many of each can he have? Homework Equations Row ops. The Attempt at a Solution I'm trying to come up with a few equations with which I can create a matrix. x1 = amount of 20p. x2 =...

1. When taking an object and the Earth as a system, its change in potential energy is given by a. m*g*change in height b. (-m)g*change in height c. either a or b d. there is not potential energy due to gravity 3. I think it is c because the sign of energy does not matter?

What would be the prerequisites for an operating systems course or for a compiler course? I am well-versed in C programming and digital circuit design but have very little knowledge of computer architecture. Would I be recommended to go through a text on comp arch before starting a text on...

Hey everyone I am having problems with a pulley system. I think that my motor is too fast now I am not sure if that can affect the pulley system and actually result in it not rotating the belt on the pulley.

In the mathematics of Calculus, a basic requirement is that the system or function should be continuous. Until the discovery that matter is discontinuous, applying Calculus in Physics was reasonable. But why is it still applied almost everywhere in physics ? Won't such applications produce...

Homework Statement Water is retained in a 1.25 rectangular section channel by a sluice gate. This gate can pivot about its base, the depth of the water is 1.5m and the density of the water is 1000kgm^-3. You must find the tension in the horizontal retaining cable attached to the top of the...

Hi, if a load is given in MVA and I work out the Real and reactive power, is the equivalent complex impedance per phase the values of real and reactive power divided by three in the following form: Z (per phase) = Real power/3 + j Reactive power/3 Im not sure how to work out whether the...

Homework Statement Choose an even number in the interval [100,199] and compute its orbit under the proper divisor function. Homework Equations Proper Divisor Function = σ(n) = Sum of all divisors of n, excluding n The Attempt at a Solution I am unsure what it means by "compute the...

I understand this type of field can involve many different specializations, and people who work in this field often work as part of a team to focus on very specific parts of a weapon/defense system, etc. With that said, I am not necessarily looking to work in this field, but rather I want the...

Imagine a blob of continuous charge in vacuum, the fluid elements will exert a force on each other and thus radiate away energy to infinity and thus be forever lost, does this mean that charged continuums will always lose all of its energy?

I've drawn the following FBD (using D'alembert prinicple) [The N in my drawing is the F_A stated in the question] ---------------- Assuming my FBD has nothing wrong, am I right to say that I am free to choose my torque equation about ANY POINT? somehow my solutions vary depending on my point...

So I've recently came into a few dirt cheap piezo actuators. Was considering turning them into a x-y-z positioning stage then maybe a micromill or something. My one issue is I'm unsure of what is best to use for feedback control in the sub-micrometer range. Only thing I know that accurate is...

I've been asked to approximate a dollar amount for heating and cooling an occupied tenant space in a commercial office building. We've looked into installing a temporary gauge on each unit to give us a good approximation, but the cost to gauge up all the electrical and gas was beyond the scope...

I'm currently a physics major with a year left, and deciding whether to switch into mathematical physics, mathematics or applied mathematics. I'm definitely switching into one of them, as I can meet the requirements for either in my last year and all of them align better with my interests...

Ordinary photovoltaics work by depleting phosphorus un boron doped silicon in eatch other and creating a permenant electric field, which then separates any pair of hole and electron induced to the conducting band by a incoming photon, creating an aditional elekctric potential difference, which...

Hello again, I have a new question (again, as usual). But let me give first an overview, haha. If not interested please skip the first two paragraphs. XD I was trying to code a Bogacki-Shampine method for systems of 4 differential equations in my graphing calculator but apparently I lack the...

my knowledge of time-space is limited, so my question might be poorly/wrongly constructed/verbalized: Do we have two sets of co-ordinate systems when space-time is bent (by say, mass)? in one system the circle becomes, say, an ellipsoid while in other it remains a circle? in one...

Hi everyone! Design of electrical systems for buildings is the field I want to engage in the future. I have already basic concepts learned about this. But I want to improve myself in this field. I am looking for a reliable and organized reference. Please help me choose the book/reference I...

Hi, I have a PS&P assignment where we are designing the protection for a substation - its an overview of the type of protection etc. I have a star delta 42MVA (cyclic rating) 132:22 kv TX... I've done some research and want to use an SEL487E relay. Since this is star delta (star...

I have attached an image of a ''brick-wall'' band pass filter. Can someone please help me find the expression of frequency response for it? Homework Statement Homework Equations The Attempt at a Solution

How would you interpretate this image about LTI systems and convolution?

Homework Statement Given the transfer function: R(s)=\frac{K}{s(s+2)(s^2+4s+5)} Find the following (needed to sketch the root locus: a) Number of branches b) Symmetry c) Starting and ending points d) behavior at infinity (asymptotes) e) Real axis breakaway and break-in points. f)...

Homework Statement Oscillation in mechanical structures can often be described by the function: y(t)=(e^(-t/τ))*sin(ωt+θ) Where t is time , ω is oscillation frequency in radians per unit time. The oscillations have a period of 2*π/ω and their amplitudes decay in time at a rate...

Hi all, I'm taking a systems modeling class and as such a portion of the class consists of a differential equations review, mostly centered around Laplace transforms and some functions I've never had to deal with before so I was hoping for a bit of help if you'd all be so obliged! I have quite a...

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...

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...

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...

Homework Statement The mass of a car that acts on one wheel is 100 kg. The elasticity (spring) constant in the suspension system of that wheel is k= 10^4 N/m: Design the strut (find the friction/resistance constant c) such that any vertical motion of the wheel (set up for example by going...

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...

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...

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...

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...

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...

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} =...

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...

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...

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)...

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...

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}...

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

Homework Statement Different control systems can be distinguished by categorising them as regulator control systems, positioning (or servo) control systems or tracking control systems. definition? components features, diagram? examples? describe one industrial application in detail...

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?

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...

Hi All, I am an engineer with limited knowledge of the mechanisms with link hardware to software designs, for example in real time control systems, and wonder if you could help me understand what happens. Can somebody explain to me what the typical process might be; let's say for instance...

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...