Networks Definition and 123 Threads

Homework Statement Use Laplace transforms to derive an expression for the current flowing in the circuit shown in the figure, given that i = 0 when t=0 Homework Equations Expression for the current in an LR series circuit I(t) = V / R (1-e-Rt/L) V - Volts (6V) R - Ohms (10Ω) L...

Hi. The problem is: Show that this capacitor network can be reduced to one equivalent capacitor and find its capacitance Ceq. (The network is in the attached image) I've tried to solve this problem by eliminating the capacitors two by two but it never lead me to the correct answer: Ceq=2C. In...

Homework Statement The attached page explain the work and delay lag but actually i can't understand when he said for example that two bridges can't start together?why? how he know that? and in other graph he said the different directions of lag which is correct actually i completely...

Looking for a recommendation of a book I can take out from the library at my University. I am looking for a book that has questions & answers (even or odd) to circuits involving transformers. I currently have a textbook with problems, but it has no answers. I find it rather pointless working...

I have been reading up on spin networks and spin foams... but most of the publications seem to come from 1999 or 2000. Does anyone know what happened to this idea? Is it still valid, or was it a dead end? Is it still an active area of research, or did the idea perhaps evolve into something with...

Can anyone comment on the advantages and disadvantages of both graph theory vs. using a system of differential equations to study a complex network? For example, how much computing power and running time would a graph theory approach use compared to say solving a system of 100 differential...

Hi guys, I have this homework question that i have attached. I've done a couple questions but I'm not sure if they are right. For the first question i arrived at 15.49 by rearranging the formula; energy stored=1/2.C.V^2. when rearranged you get the square root of 240 for voltage...

Hello everyone! Searching for applications of artificial neural networks (ANNs) to real world problems, all I found were applications to computer science problems (e.g. face recognition, OCR, automated control of systems and machines etc.) and some very experimental works (e.g., crime forecast...

This is an exciting development in LQG. They have a proposal for how to generalize the ideas of spin network and spin foam so that the network vertices are made of chunks of noncommutative space instead of ordinary space. I'd be glad if anybody who's looked at the paper and wants to volunteer...

Holonomy Spinfoam models address several of the issues left open by EPRL and I suspect HS could become the new "EPRL" phenomenon: the new Loop pace-setter, instead of another strong candidate (Twistor Networks) we were discussing in another thread. I'm pretty sure that anyone who wants to...

Twistor Networks addresses several of the issues left open by EPRL and I suspect TN is destined to be the new "EPRL" phenomenon: the new Loop pace-setter. So I suspect (having spent time looking at other potentially influential developments) that anyone who wants to follow Loop gravity research...

I do not understand two-port networks. Why are they so useful? My book says that for a two port network current incoming and outgoing at each port must be equal. Why is that? Okay, even if they are equal how does that help us? How are we able to neglect all the inner circuit and just focus on...

Homework Statement see attached Homework Equations The Attempt at a Solution $$\eqalign{ & {V_1} = {Z_{11}}{I_1} + {Z_{12}}{I_2} \cr & {V_2} = {Z_{22}}{I_2} + {Z_{21}}{I_1} \cr & {\rm{ - - - - - - - - - - - - - - - - - - - - - - - - - - - }}...

An inductor of negligible resistance and an inductance of 0.2 H is connected in series with a 330 Ω resistor to a 12V d.c. supply. Determine: (a) the time constant of the circuit (b) the voltage drop across the inductor after two time constants (c) the voltage drop across the resistor after...

Hi, I am a very experienced programmer in C & C++. I want to learn about Artificial Neural Networks. Can someone recommend good books or websites?

Hi all, :shy: Could anyone explain in very simple language, for lower UGrad standard, what spin foams and spin networks are? Thank You. SINCERELY DPA

Why is there so much talk about two port networks in books and stuff I don't fully understand, what happens if a thing is not two port?

Hello. I maybe should have put this in the maths section, but it is related to electronics, so I figured here. I am reading Microwave Engineering by Pozar, and in one of the examples, it says that the series RC load impedance is ZL = 60 - j80, so the resistance is 60 Ohms and the...

Homework Statement http://i134.photobucket.com/albums/q100/megajette2/Resistornetwork.png Homework Equations parallel resistors share the same nodes or terminals and simplify to (a*b)/(a+b). in series resistors values are added. The Attempt at a Solution...

Homework Statement Calculate the value of the current through the 12V battery shown in figure (attached). Homework Equations V = IR I1 = I2 + I3 The Attempt at a Solution I've calculated the current for the left hand loop, see below: Loop 1: E_1- E_2- V_1- V_2=0 E_1- E_2=...

Recently, I read two early papers of Penrose on spin networks (made available online by John Baez http://math.ucr.edu/home/baez/penrose/" ), familiar today of course because of their use in loop quantum gravity. In their original form, however, they seem to me to have been quite different...

Hi, I have read on Wikipedia (http://en.wikipedia.org/wiki/Rectifier, under Rectifier output smoothing) "In extreme cases where many rectifiers are loaded onto a power distribution circuit, it may prove difficult for the power distribution authority to maintain a correctly shaped sinusoidal...

suppose i have 2 bayesian networks... a->b and c->d ie b depends on a and d depends on b now P(a,b,c,d)=P(a)*P(b|a)*P(c|a,b)*P(d|a,b,c) =P(a)*P(b|a)*P(c)*P(d|c) Am i right...? please reply..i need it as quickly as possible...

Wireless and Mobile Networks - Mobile transfer between networks with direct routing In this setting: // HENCE my textbook briefly says, but not clarify well 1) Anchor Foreign Agent is the Foreign Agent in that foreign network where the mobile node was first found... well, when mobile node...

Homework Statement Question attached Homework Equations Frequency response of circuit given in document The Attempt at a Solution The question leads me to find the Gain and phase of the gain, pole and zero terms. The breakpoint frequency and the point where the gain term is 0db...

As a summer project which I wanted to do last summer but failed, I want to learn some stuff about computer networks and as an end result be able to make a simple bot that can play some simple online game. What got made me gave up last time was I was using a packet sniffer and I had no idea...

Queueing networks...please some experts help me! Hello to everyone. I have a question concerning Queuing Theory and in particular Queueing Networks. For my Ph.D thesis I need to evaluate the steady state behavior of queueing networks featuring finite buffers between nodes and "blocking after...

I have Verizon FIOS and the service is great, but along with that service, they provide a crappy router (Actiontec MI424) that you must use. I would like to just use it as the internet connection and use my Linksys WRT160N to network my devices together inside my house. Unfortunately, they...

I came across this link: http://spie.org/x648.html?product_id=540785 Paper abstract: It was published in a journal called "Quantum Information and Computation II". I checked the accepted journal list of physicsforums (this one http://www.thomsonscientific.com/cgi...cgi?PC=MASTER ) and in...

In neural network the learning algorithm ends when the mean squared error value is less than or equal to a value we have precised. But i don't understand why we are comparing with the mean squared error and not the mean error? What does the mean squared error represent?

It is amazing to read about and watch the pro-democracy protests going on in Egypt right now. *Having been to Cairo and Alexandria just this past November, I recognize a number of the major areas where the protests are taking …...

I am building a resonant RLC network in which the inductor is actually a loop antenna that will pick up changes in magentic fields and represent them as a voltage. Is this configuration actually feasible where the loop antenna is both the voltage source and the inductor? Also slightly related...

This is a question from a past exam paper I have. In a communication system the distance between Node A and Node B is 400 km. The distance between Node B and Node C is 1000 km. Frames are generated at Node A and sent to Node C through Node B. Determine the minimum data rate required...

I work in controls and see a trend that more and more of my work is going to be dealing with networked digital devices, can anyone recommend a good networking primer, or point me at online resources? Many thanks.

I was always fascinated by the ideas regarding the Bilson-Thomson (+ Smolin and Markopolou) preons formed by braided structures. Has there been any progress in the last couple of month? Any deeper relation to spin networks?

I came across this recently: http://arxiv.org/abs/1008.4805v1" Whilst it's mostly beyond my level, from what I can grasp the suggestion is that SR and Minkowski's spacetime can be derived simply by looking at the universe as a network of discrete causal events (a granular universe on the...

Privacy policies need more consistency. We have already seen that sites will respond to user demands if they are concentrated and focused, thus it's time for a Social Networks Bill of...

In the context of LQG spin networks are derived based on Ashtekar's formulation implementing local SU(2) gauge symmetry in tangent space. Here SU(2) and 3+1 dim. spacetime are deeply related. Forgetting about this derivation and starting with spin networks, talking about dimensions does no...

Homework Statement A television picture is composed of approximately 300,000 individual picture elements (pixels), each of which can attain ten different and distinguishable brightness levels (such as black and shades of gray) for proper contrast. If for any picture element, the probability...

Hello again, Im trying to build a neural network using C++. Has anyone had a go? I think the potential implications are really interesting and would like to hear about how people might have implemented them. Another general one for anyone.

Would it make sense to think of excitations of a node as it they were made of particles of spin occupying states just like electrons in atoms?

Social Networks are ways of representing formal links between people. We often make it explicit using befriending mechanisms but their are also implicit methods, like if two people published a similar paper together. On a forum people post information from a variety of sources. The similarity in...

Can anyone explain to me what this "neural network" nonsense is all about? Everyone and their mother is doing research in this area, but nobody seems to know what "neural networks" are or why they would be useful. It sounds like pure hype to me.

Can someone explain this a little ? With regards to just what it is, it's not in the book I have.

Social Properties and First order Links I wasn't sure to put this in the math or sociology form but I already have two Social Networks topics posted in the Math forum and I think I would like to devote more specific topics to the math forum. You are subscribed to this thread Erdős–Rényi...

Since I first leaned of the concept of social networks it has fascinated me but I never really studied the topic. It seems to me a huge topic but is not widely studied compared to other areas of mathematics. What better way to study such things as the spread of information, political views...

Hey, I am looking for a good book on complex analyis (complex calculus, "complexe anlysis" in german). Any recommendations? I am a first year Electrical engineering student at the ETH Zürich. It should cover the following, and have a reasonalbe amount of examples: Analytical Funktions...

Hi, Sorry I'm not sure where I should post this, so hopefully this forum is ok. Is it possible to have two interpenetrating percolated networks of randomly arrange spheres of the same size? So if I have a 50% concentrationg of sphere A, and 50% of sphere B and arrange them randomly within...

Wifi networks. Dangerous for health?? Hi, Recently, I have installed a wireless router to create a network at home between 2 computers. This question to say the truth has worried me a bit because searching in the net about this question we can find a lot of opinions warning about the use of...

http://img359.imageshack.us/img359/8205/note0001tx2.th.jpg How can I know the top 2 plates are +60 and below are -60? 120+(-60) and 30+(-90)? And how can I fill in the blanks~?