What is Network: Definition and 462 Discussions

Network (stylized NETWORK) is a national Catholic social justice lobby headquartered in Washington, D.C. The organization focuses its lobbying efforts in the areas of economic justice, immigration reform, healthcare, peace making and ecology. Sister Simone Campbell is the executive director of NETWORK.

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  1. V

    Network Analysis: Question on fundamental cutset matrix of a graph

    Homework Statement It's a not specific problem. Just a general question. Suppose, I have a graph and I need to write a fundamental cut set matrix. If I define the cut set orientation by choosing the direction of branch current, does every other cut set have to oriented exactly the same way...
  2. Ibix

    Solving Train Network Traps: Graph Theory Resources

    My son has a wooden train set. It has straight tracks, curves, and points. I've been playing with itbuilding tracks for him, and came across something odd. If I don't really think about it and just throw something together, it almost always seems to end up that there is a "trap" - a section of...
  3. L

    Circuit help - resistors and batteries in a network

    circuit help -- resistors and batteries in a network Homework Statement (a) Calculate the current through each ideal battery in Fig. 28-41. (As a sign convention, assume the currents are "up" through each battery.) A (I1) A (I2) A (I3) Assume that R1 = 1.5 , R2 = 2.5 ...
  4. C

    Find the Thevenin resistance for network with dependent current source

    Homework Statement http://imageshack.us/a/img15/7218/sg2prob11.jpg Find the Thevenin resistance for the network(Sorry for the bad drawing, but that is a point like point / node A on the bottom where it's going out too and likely part of the load too, with a wire connected to the circuit, I'll...
  5. G

    Controller Area Network (CAN) bit stuffing

    I was going through an article on CAN bus in Wikipedia & was stuck at the point where bit stuffing is explained. CAN is an asynchronous bus. They implement NRZ (Non-Return-To-Zero) encoding. To enable the receiver to correctly read the messages, continuous resynchronization is required...
  6. B

    Calculate the equivalent capacitance in the network

    Homework Statement Calculate the equivalence capacitance of the network; where C1 = 8.55 μF, C2 = 4.00μF , C3 = 8.65 μF, C4 = 3.20 μF http://imageshack.us/content_round.php?page=done&l=img822/4296/loncapa.gifHomework Equations Capacitane in parallel: C = C1 + C2 + ... Cn...
  7. B

    How do I calculate the equivalence capacitance of this circuit?

    Homework Statement http://loncapa2.fsu.edu/enc/66/45d3639022485d2ba995cf84c579b584bffe5ace9851f3da3fbac5f5a1c7d2ee9dfed8743cf75459ef336ad7a1bbe176f7a0cf1a35a519ce0cef3c31febf9858404cac5a2cd3ace3851dbef61ee03a25f7a5c41a87b32e0f.gif Calculate the equivalence capacitance of the circuit shown...
  8. S

    Training a Neural Network: Step-by-Step Tutorial

    Homework Statement I am trying to train a neural network using the following training set: (4,6) (9,10) (1,2) (6,2) So, if I enter input 4, it should give me 6. If I enter 9, output should be 10. If I enter 3.5, it should approximate an output based on the training examples...
  9. J

    How Does Inductance Affect DC Circuit Behavior?

    1. 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...
  10. C

    Find Io in the network nodal analysis

    "Find Io in the network" nodal analysis Homework Statement http://img189.imageshack.us/img189/8807/homeworkprob22.jpg Find Io in the network Homework Equations V = IR current division, voltage division, KCL, KVL Nodal Analysis (or mesh)The Attempt at a Solution So I think I need to use...
  11. V

    How Does Symmetry Solve a Cubic Resistor Network?

    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...
  12. S

    Find all branch currents in the network shown.

    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...
  13. R

    Determining the equivalent resistance of an irreducible network of resistors

    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...
  14. T

    How does a virtual private network work (basics)

    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...
  15. B

    How to solve a Network Analysis

    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...
  16. 1

    Linear System - Network Flow Matrices

    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...
  17. S

    Sectionalize a 12 kV distribution network

    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...
  18. I

    Bayesian network simplification.

    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...
  19. D

    Designing a Neural Network Control System

    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...
  20. N

    Find Capacitor network with a known potental difference

    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...
  21. K

    Help with a Series RL network and Power factor

    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...
  22. O

    An infinite network (XKCD) - is it not clear?

    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...
  23. B

    Why Did Only One Computer Connect to the Network This Morning?

    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...
  24. JJBladester

    Simplifying a resistor network using pi-T (Y-delta) conversion

    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...
  25. P

    What are the barriers to implementing a large scale smart-grid power network?

    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...
  26. H

    Parallel flow pipe network help

    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...
  27. N

    Confusion:collapsing 3 points with equal potential in a cubical resistor network

    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...
  28. E

    Why is the ac output voltage negative for a common emitter Bjt network?

    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...
  29. E

    Help Me Find Resistor Network Specs for My Circuit Board

    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...
  30. T

    Why is the 802.11b network divided into 22MHz bands?

    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
  31. C

    Engineering Circuit Analysis for Power Transmission Network Question

    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...
  32. M

    Resistor & Ideal source network

    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...
  33. S

    Cube R network resistor calculation

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

    Where can I find examples of applications for trained ART and SOM networks?

    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...
  35. G

    Challenge: Investigating Ac Signals Coupled to DC Network

    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...
  36. F

    Phase of current and voltage in LCR network

    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...
  37. T

    How to Simplify Resistor Networks: Parallel and Series Connections

    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.
  38. QuarkCharmer

    Power in network of resistors?

    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...
  39. D

    What Is the Correct Way to Calculate Resistance in Complex Resistor Networks?

    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...
  40. D

    The type of network involving potentiometer

    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...
  41. L

    Network Theory Problem do help

    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...
  42. B

    Resistor network question Cant get it

    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...
  43. K

    Capacitor network finding potential

    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...
  44. R

    Linear Blood Vessel Network Examples in Animals or Plants

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

    Complex network theory to study ocean flows?

    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...
  46. S

    Fortran How to put a output file in a network path with Fortran f90

    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...
  47. Q

    Independent current and voltage network analysis

    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...
  48. S

    Solve 4-Mesh Network for Rx & Lx w/ R, C & Source Freq.

    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...
  49. L

    Network Theory: What Do I Need to Study for Academia?

    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?
  50. J

    Calculating Head Losses through a Pipe Network

    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...
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