Network Definition and 444 Threads

Dear all, I'm trying to understand the second figure of the following webpage. The webpage simply solve it by 'symmetry', but I could not figure out its reasoning. Could someone explain how does it work? Thanks in advance...

Homework Statement The problem and its solution are attached. Homework Equations V = RI R_eq = 1/R_1 + 1/R_2 + ... + 1/R_n (Parallel circuits) R_eq = R_1 + R_2 + ... + R_n (Series circuits) The Attempt at a Solution For the two lines of math below “Now referring to the reduced...

Homework Statement Alright so I am having trouble finding the equivalent resistance of something like this Without "hooking it up" to a current source and solving a large system of equations to find the voltage drop across the network and therefore the resistance. Is there a faster...

is there anyway someone could explain basically how a vpn works (specifically "HotSpot Shield)? I am asking because i can't figured out if I am getting hacked or if the network is supposed to do this? Whenever I connect to a wireless network, hotspot shield secures the connection and then i...

1. The flow of traffic (in vehicles per hour) through a network of streets is shown below. The diagram shows : 200 and x2 is entering junction 1 and x1 is leaving the junction. Junction 2, 100 and x1 is entering the junction and x3 is leaving the junction. Junction 3, 200 and x4 is leaving...

Homework Statement Consider the network of streets with intersections a,b,c,d and e below. The arrows indicate the direction of traffic flow along the oneway streets, and the numbers refer to the exact number of cars observed to enter or leave a,b,c,d and e during one minute. Each xi denotes...

I'm currently a student who is working on a Bachelor in Electrical Engineer project in order to graduate. My project is to sectionalize a 12 kV distribution network for an Oil Company located. My Question is: What components do I need if I want to do this? I know I will need an 12 kV rated...

Let's say we have a bayesian network G. Consider a subset A of this network consisting of a set of nodes and all the edges between them. Assume, for the sake of simplicity, that all nodes in A are binary (either true or false) and strongly anticorrelated i.e. if anyone of the nodes in A are...

Hello all I'm trying to design a Neural network based control system which will do the following i have 120 computer servers with a. power b. temperature of server inlet c. temperature of server outlet Now i have readings for all 3 operating from 5kw to 35 kw in steps of 5 kw My server...

Homework Statement For the capacitor network shown in the Figure , the potential difference across ab is 12.0 V A) Find the total energy stored in this network. B) Find the energy stored in the 4.80μF capacitor. Homework Equations C = Q/V The Attempt at a Solution I'm...

Homework Statement In a 60 Hz series RL network, the source is supplying 400 W of real power. If R = 15.08 Ω and L = 40 mH, find a. The power factor. (Indicate if it is leading or lagging) b. The apparent power supplied. c. The reactive power supplied. Homework Equations None were...

Hi, unless I'm missing something here, it seems to me that the answer is that it is infinite, and that that is pretty intuitive. Is that not the case? I would think it could be simplified to view as two parallel and infinite resistances, giving ∞2/2∞, which simplifies to half...

Something happened last night and one or more things failed in the home network. For years it has been three computers running XP with fixed IP addressess hard wired to an SMC 7400VBR router hard wired to a Motorola SB5120 Surfboard cable modem. Nothing wireless. Cyberpower UPS and power...

Homework Statement Reduce the resistor network to a single resistor. Go step-by-step and indicate the series or parallel combinations being reduced. Homework Equations For series resistors: R_T=R_1+R_2+R_3+\cdot \cdot \cdot +R_N For parallel resistors...

What are the barriers to implementing a large scale "smart-grid" power network? I know that many renewable energies are only available at certain times of the day, or in certain areas. Therefore a "smart-grid" is important for storing and distributing the energy. I see the main issue to be...

Let's say I have a simple parallel flow problem as shown in the attachment. The flow is pressurized and the downstream of the return goes back to a piping system that is negligible. It does not vent to atmosphere. I've tried reading up on the subject, but I got stuck at a certain point. At...

Homework Statement The question is to find Equivalent resistance between opposite ends of a cubical resistor network . each resistor of resistance R . I am referring to this website here http://mathforum.org/library/drmath/view/65234.html I am halfway through it but I am stuck at a...

I get that collector current is fixed so as collector current goes up, the voltage drop across the collector resistor goes up and the collector-emitter voltage goes down. Which is why it is basically zero at saturation. But for ac it is not zero but negative when input is positive. why is this...

hey guys I have been given a piece of equipment to fix, that is not charging its battery. I am trying to map out its small circuit board to try and understand what it is thinking so i can figure out what isn't working. I am having trouble tracking down the resistor network specs so I can draw...

I have been trying to learn why 802.11b and g networks can only use 3 22MHz bands simultaneously why can't these bands be made smaller for faster data rate transfer. Why is it divided specifically in 22MHz bands? Thanks for reading

Hey! Below you will find a piece of text I found on a paper. There are some things I don't get, perhaps you could help me. What it means for the network to be lossless? Also, why is the power flow equal to Re[Vi(t) Ii,k(t)*] and not outright Vi(t)*Ii,k(t) ? Why the complex conjugate? I...

Homework Statement http://img138.imageshack.us/img138/6717/hwprob.jpg Homework Equations General intuition, KCL, KVL The Attempt at a Solution I've worked this out multiple ways to no avail. I think the easiest way to go about this is to set the left node to ground (0 potential) and go...

How does equivalent resistance from D to B is 3/4 R ?

Hi! I attended a class in neural networks and I learned something about ART and SOM. I learned how to implement the learning algorithm, but then? I wasn't told how to use the trained net! I looked in Google and I didn't find much, everybody talks on how to train a neural net, but nobody says...

I have been going through the ac signals coupled by a capacitor to a dc network.. Using superposition principle.. for solution it was shown that both bulk resistance and dynamic resistances for the diodes used are required... Why is this happening.. Since to what i know bulk resistance is...

Homework Statement A network consists of an inductor, capacitor and resistor are connected in parallel and an alternating sinusoidal voltage is placed across the network. Sketch the phase of the total current relative to the voltage as a function of the angular frequency. The Attempt at a...

Homework Statement Homework Equations Resistors in parallel and series The Attempt at a Solution I connected points which had the same potential. I'm not sure where to go from here tho.

Homework Statement Find the resistance of R, such that the network dissipates 295 Watts. Homework Equations \frac{1}{R_{eqp}} = \Sigma \frac{1}{R_{i}} R_{eqs} = \Sigma R_{i} P = \frac{V^{2}}{R} = VI = I^{2}R The Attempt at a Solution What I did was first find the equivalent resistance of...

Homework Statement Hi guys, Im new here and I am working for the first time with with these applications. So, i have this resistor network https://www.physicsforums.com/attachment.php?attachmentid=44965&stc=1&d=1331497208 where R1=220 ohm and R2=330 ohm. I must find the electrical resistence...

Homework Statement Adjust the potentiometer to get V_{0} = 0 V(V_{a} - V_{b}). What is this network called? Homework Equations The Attempt at a Solution I'll be honest. This professor didn't even prepare for the lab and decided to do lab about the potentiometer we didn't even...

1. Homework Statement Va - Vb = 6 Volts Calculate Vc - Vd = ? The circuit diagram is shown below :- All resistances are equal to "R" as shown in fig. except for 1 ohm and 2 ohm resisters. Two voltage sources 10V and 5V are given and a current source in parallel to 1 ohm resistor. Homework...

Homework Statement A network of 5 resistors is constructed to a 12.0V emf. the total current in the circuit is 12.0A. determine, draw and label the configuration for the network of resistors R1=1ohm, R2=1ohm, R3=1ohm, R4=1ohm, R5=4ohm Homework Equations The Attempt at a Solution...

For the capacitor network shown in the figure, the potential difference across ab is 12V. Find (a) the total energy stored in this network and (b) the energy stored in the 4.8 uF capacitor. figure: http://i.imgur.com/Wxbuu.png ATTEMPT: PART A: i first did the leftmost 2 capacitors...

The pattern could be at an arterial, arteriole or capillary level. There are plenty of examples of branched patterns in organisms. [SIZE="1"](C) Baccar et al, Difficulté du diagnostic étiologique d’un poumon clair unilatéral, La tunisie Medicale - 2011 ; Vol 89 ( n°06 ) : 578-579 But...

A professor at my university is currently working on using "complex network theory to study the coherence of flows in ocean circulation". If I'm interested, I could possibly do my bachelor thesis on this subject. Before I go talk to him, I'd like to at least have some idea of what this is...

Hello Folks I have a program code in Fortran f90, that program generate an output file and put that into the same directory where the program resides, I need to put that output file in a network path ex: \\server_name\resource_shared I will appreciate if you could provide me the commands...

Homework Statement Theres two current sources and three voltages sources the problem wants to know the power supplied by each current source Homework Equations according to the book the problem can be solved using Kirchoffs current law and kirchhoffs voltage law The answers according...

Homework Statement The four-mesh network has the mesh currents I_1, I_2, I_3, I_4 in the indicated regions 1, 2, 3 and 4 respectively. In this circuit, the resistor R and the identical capacitors (Zc) are adjusted such that I_4=0 For this condition, the unknowns Rx and Lx can be...

What do I need to study in order to become a network theorist in academia? What fields and subfields do I need to major or minor in?

Hey everyone! I'm trying to determine the losses through a pipe network that consists of 254.5 feet of 0.75 inch diameter copper pipe. The flow rate is 0.37125 gpm, with a corresponding velocity of 0.26962 fps. The fluid is water at 150 degrees F. Based off that information, I have a...

I'm trying to implement this example http://www.cs.bham.ac.uk/~jxb/INC/l3.pdf (page 15) I'm trying to do Iteration training, but it seems as if the results always converging to a steady error rate that is too large to be acceptable, the values centering around 0 while they should be close to -1...

Hello, I'm interested in neural network programming but I am a beginner. Recently I wrote an example in C++ that I found in a book. It was a feedforward 3 layers network that learns the examples with the backpropagation algorithm. The aim of the network was to learn to "throw a stone": I taught...

Homework Statement A wireless computer network transmits data across the space between nodes as a modulation of a 2.45GHz (microwave) carrier signal. The signal is able to pass through a brick wall that is 100mm thick. Measurements have determined that the dielectric function at microwave...

My current problem: I have a machine sending a file every few seconds over its wired connection. While this is occurring, I want to be able to access a wireless network and download a file from a mapped network drive without interrupting the aforementioned file transfers. Any suggestions as...

What are these? http://www.wired.com/dangerroom/2011/11/china-gigantic/?mbid=ob_ppc_dangerroom This must be a driving training ground. What's strange is the way the lines are cut. Some of the curves are highly acute, yet the points are carefully constructed, not all the way a bulldozer...

Homework Statement If the network layer is sending a message from A to D via B, it can be sure that a message sent by the data link layer from A to B will always arrive at B, and from B to D will always get to D. How is it possible for the network layer not to be able to correctly deliver a...

we have a ricoh mfp9001. we can scan and print to it from client pc's. is there a way to fax from each workstation over lan from the mfp 9001. we can send and receive from the mfp itself.

Homework Statement Find the Thevenin equivalent network of the lattice network (see attached), viewed from points As and Br (terminals Bs and Ar are not connected to anything). Homework Equations The Attempt at a Solution Without the resistance f, the problem is quite simple. I...

Homework Statement Calculate the J notation impedance of the network We have an inductor in series with a resistor and both in parallel with a capacitor. Homework Equations The Attempt at a Solution i believe it is true that if I was to say: if I have an inductor in parallel...

for the following circuit, i am trying to find the y parameters i have found y11, y12, and y22 to match the answer that my text provides, but i am having trouble with y21 the solution given is y11 = 1.5, y12 = -0.5, y21 = 4, y22 = -0.5 in trying to solve for y21, i get 4.5 this is...