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. SmritiB

    Resistive network point to point analysis

    In a complex resistive mesh (grid), 2 points are chosen for applying a voltage source. Now there are many paths the current can take from A to B. And there is an equivalent resistance computed as well. But how to calculate the least resistive path? I.e. The path along which when traversed, the...
  2. D

    Finding unknown values in DC resistor network via matrices

    Homework Statement I need to get 7 equations to make a 7x7 matrix in order to solve it. I have 4 of them, but I'm not sure how to get the voltages equations. Homework EquationsThe Attempt at a Solution I have got four equations so far. One is simply using KCL, I1 = I2 + I3 + I4. The other...
  3. K

    1 pipe branching into 3 pipes, pressure of each branch?

    Hello all, I am a mechanical engineer, graduated just last year. Although I am not working with fluid mechanics right now, I was browsing through my fluids book from school and saw the section on pipe networks. As I was reading, I developed this question which I could not find an answer to in...
  4. anorlunda

    Insights AC Power Analysis – Part 2, Network Analysis - Comments

    anorlunda submitted a new PF Insights post AC Power Analysis – Part 2, Network Analysis Continue reading the Original PF Insights Post.
  5. G

    Troubleshooting Network Analyzer Impedance Measurement

    In class we are learning to use Network Analyzers. I am trying to measure impedance on with it but the analyzer is not displaying the point right. I'm measuring a 100 ohm resister and the point is way to the right on the smith chart, like not even on the smith chart. My professor doesn't know...
  6. Y

    Three-Phase Delta Network: Not all Voltage Sources are 120V?

    Using the Delta Netowrk from this image: http://www.belden.com/images/B23_WyevsDelta.jpg Between Y-X, there should be 120V. Between Y-Z, there should be 120V. Between X-Z, there should be 120V. But wait! If we assign values to make the above statements true... Call X = 0V, and Y = 120V, so...
  7. T

    Should I choose Network Science or Plasma Physics?

    Thank you for opening my first thread. I have just began studying Physics at a university in Hungary and would like to get some information about Network Science and Plasma Phyics/Nuclear Fusion. I am looking for a branche in Physics in which I can do research in the coming years and get a job...
  8. C

    Voltage at load of distribution network

    Please bare with me, this is my first post here (although I've read a lot on here over the past few months) Hopefully I've used the correct formatting etc. I've got to a sticking point on the final point of the question below (2iii) I'm pretty happy with my answers to 2i and 2ii so I've not...
  9. 22990atinesh

    How to calculate Clock Skew of nodes in a distributed system

    A distributed system has 3 nodes ##N_1##, ##N_2## and ##N_3##, each having its own clock. The clocks of nodes ##N_1##, ##N_2## and ##N_3## tick 800, 810 and 795 times/ms. The system uses the external synchronization mechanism, in which all 3 nodes receive the real time every 30 seconds from...
  10. D

    Optimizing Flow in a Networked Manifold System

    Hi, A chamber (manifold type cylinder) has 1 inlet and 8 outlets of 3 inch diameter each. 8 suction blowers are connected to the chamber's outlet. Each blower's suction flow rate is 1000 cfm. what will be the flow rate through the inlet of the chamber (diameter = 3 inches). Will the inlet...
  11. T

    Best Ethernet / Network switch setup?

    My grandma recently gave me a relatively new Cisco gigabit ethernet / network switch because she never used it. Here are the devices that need to be wired: Here is the current setup: Internet / Wifi Modem upstairs, my bedroom / "tech studio" is in the downstairs / basement of the townhouse...
  12. P

    Help with this network analysis question

    given: source voltage =120V voltage across 15 ohm resistor = Va there is a dependent source 2Va and a 30 ohm resistor. I tried applying KVL i.e 120-30I+2Va-Va=0 where Va=15I and got I=2.66A whereas my teacher told me that the answer is 8A. how is it so? Is it some basic knowledge that I have...
  13. E

    Determine the currents in this electrical network

    Homework Statement This is quite an easy problem but I'm not sure if I set up my equations correctly, and I want confirmation. We are given the following circuit: And our task is to determine the loop currents i_{1}, i_{2}, i_{3}, i_{4} . Homework Equations Kirchhoff's first law: sum of...
  14. A

    MHB Re-configurable Battery Network Modeling

    I need to model circuit given at (https://drive.google.com/file/d/0B8MN0_dZJLHZRllhV2Y0M0FnaVU/view?usp=sharing) so that we may known output for any state of switches. Given Information: Vector of State of Switches e.g. [s11 s12 s13 s21 s22 s23 s32]. I need to model a transformation matrix...
  15. A

    Explanation (or Proof) for network theorems?

    We started Network analysis and we were given Circuit Diagrams to be reduced using the following: Kirchoff's Laws i.e KVL and KCL Source Transformation Superposition Theorem Thevenin's Theorem Norton's Theorem and Star-Delta Conversion However I wasn't given proofs for any of these theorem...
  16. F

    Understanding Bandwidth - What is it & How Does it Relate to Media?

    I'm having hard time understand what bandwidth really is? The book I'm using defines it as the width of a signal's spectrum (where spectrum is the range of frequencies in a signal). So, for example, I have a composite, periodic signal s(t) = 4/π[sin(2πft) + (1/3)sin(2π(3f)t)]. Then the...
  17. Bobby425

    Engineering Thevenin's equvalent circuit of the network?

    Homework Statement thevenin's equvalent circuit of the network Homework Equations thevenin's voltage thevenin's impedance The Attempt at a Solution using nodal analysis i tried to find thevenin voltage but the dependent source and the dependent variable troubling me!
  18. G

    L Impedance matching network problem

    Hello. The attached image is L impedance matching network, use for impedance matching between source and load impedance. The calculation shows that in this circuit, load impedance Rp sees whole impedance (equivalent impedance) of the source impedance and reactive components as matched to...
  19. Bobby425

    How to find the voltage 'v' in the given network?

    Homework Statement Homework Equations [/B]The Attempt at a Solution
  20. Bobby425

    How to find the voltage 'v' Specified in the network shown?

    Which method is used to find that voltage v?
  21. baby_1

    Why Does Zin Calculation Differ in Single Stub Matching?

    Hello As you see this problem with single stub matching I matched zl=.5+1.5i to a normalized line (Z0=50)(I did it with smith chart and analytically) but as you see in the second picture as I calculate Zin it doesn't get me the same result (.5+1.5j). what is my wrong?
  22. H

    Chemistry Molecular Solid vs Network Covalent Solids

    Homework Statement I'm having trouble figuring out if a solid is a molecular solid or network covalent solid. Classify the following as a network covalent solid or a molecular solid: 1. CO2 2. SiO2 Homework Equations Molecular solid held together by intermolecular forces Covalent network...
  23. K

    Multi-scale entanglement renormalization ansatz Tensor network

    as a new proposal for QGhttp://arxiv.org/abs/1502.05385 Tensor network renormalization yields the multi-scale entanglement renormalization ansatz Glen Evenbly, Guifre Vidal (Submitted on 18 Feb 2015) We show how to build a multi-scale entanglement renormalization ansatz (MERA) representation of...
  24. Suraj M

    Capacitors in a simple network

    Homework Statement Here's the question as it was given. we should find the effective capacitance across A and B, Homework Equations ##C_p = C_1 +C_2+...## ##\frac{1}{C_s} = \frac{1}{C_1} +\frac{1}{C_2} +...## The Attempt at a Solution Looking at the diagram i thought The capacitance should...
  25. B

    Understanding Earthing: Risks and Safety in Un-Earthed Energy Networks

    Hi All, First post of many on the forum. On the Subject of earthing I had always been led to believe that electricity would always go to ground (if of course ground was the lower potential) I was talking to someone the other day who was discussing un-earthed transmission systems and live...
  26. S

    How to selfstudy to learn (electronics) network analysis (Thevenin, Norton)?

    I am learning network theorem,my syllabus includes application of kcl,kvl,thevenin and norton theorem,superposition theorem,maximum power transfer I studied it from malvino,its quite good! But lack of solved problems! Actually I am finding difficulty while solving networks with double voltage...
  27. S

    Unraveling the Network: Solving Multilayer Connections

    Homework Statement I won't go into detail as I am just trying to figure out the methodology of this problem. Having said that: I have 3 inputs. These 3 inputs are connected to a hidden layer of 3 other nodes and then a single output node. Each node of ABC is connected to each node of DEF and...
  28. gfd43tg

    Reducing energy consumption and heat exchanger network

    Homework Statement If you are allowed to make changes of column pressure and temperature, stream preheating or cooling temperature, please propose a process change that can significantly reduce the energy consumption at DTmin of 10°C. The modified process should maintain the product quality and...
  29. Strilanc

    Is it Possible to Transmit Classical Information with Quantum Network Flow?

    This is a puzzle I came up with. I'm trying to judge whether the solution is obvious or not. Technically it's more closely related to quantum computation than quantum physics, but... let's try it anyways. We find ourselves with the following network: The goal is to find a way for the sender...
  30. GoldWing

    How Do You Calculate Net Resistance in a Triangular Network?

    Homework Statement Assuming R = R' in the network shown above, determine the net resistance between the points a and c. Express your answer as a number times R. b. Assuming R = R', determine the net resistance between the points a and b. c. Now suppose R' = 2.5R, and find the net resistance...
  31. N

    Optical Character Recognition using Neural network

    Hey all, does anyone know a link where I can find a c# implementation of a neural net that does OCR WITHOUT using libraries, I feel that OCR is a nice way to learn how neural nets classify data. Any help appreciated, thanks.
  32. GoldWing

    Capacitor Network: C1,C2 & C3 in Series & Parallel

    Homework Statement Capacitors C1 and C2 are connected in series and this combination is connected in parallel with capacitor C3. Homework Equations Q=CV Ceq=C1+C2+C3 equivalent capacitance for capacitors in parallel 1/Ceq=1/C1+1/C2+1/C3 equivalent capacitance for capacitors in series The...
  33. R

    XP Laptop cannot access network

    My ancient Dell laptop used to work fine, but now I cannot access ethernet network we're on. It claims the speed is 1 Gbyte or 1 GHz too. I checked the connection by bringing in my MacBk Pro but that is not a viable option for this location. We have no "UT person" - it is roll your own. Any...
  34. T

    Engineering Mesh Current Method: Solve for Vx in Network Q11

    Homework Statement Obtain the voltage Vx in the network of Fig.Q11, using the mesh current method. (Ans: Vx=4.35∠-194.5) Homework EquationsThe Attempt at a Solution I am not getting the correct answer, are my loop equations correct ? 10 - 2*i1 + 2j*i1 -5j(i1+i2) -5(i1+i3) = 0 4.33 + 2.5j -...
  35. A

    Undetermined system for electric network

    Hello! First of all, this is not a HW problem and I already solved it. Actually, it most likely was a HW problem for my friend who gave it to me. I would take the opportunity to ask exactly how to handle this: I'm not a student but I like going back to school exercises in Physics and gain deeper...
  36. AdityaDev

    Understanding the Function of Switches to LAN Traffic Management

    In my computer textbook, on one page, its given that switches can't stop traffic from traveling to all other LAN segments. On the next page, it says that switches send traffic only to appropriate connections. On a YouTube video, it says both will happen. First it send the packets to all...
  37. A

    Resistor network and 2 voltage sources, help sought

    [Mentor note: thread title reworded] R = 1.00 k and = 250 V in Figure P28.25, determine the direction and magnitude of the current in the horizontal wire between a and e. http://www.webassign.net/pse/p28-23.gif I found a solution online...
  38. D

    Resistor Network Circuit Analysis

    Could someone help me with number 1. I think I did it wrong. I attached the diagram with the labels. On the original one the resistors aren't labeled, but I separately labeled them on my diagram. 1. R1=1.0 ohms R2=3.0 ohms R3=5.0 ohms R4=12 ohms R5=2.0ohms R6=4.0 ohms R=0.2 ohms...
  39. Digitalism

    Smoky 3D complex network analysis that evolves in time

    Does anyone know of any tools/graphs that show relationships in networks in a more "smoky" form that evolves in time? Preferably that correlates with spatial location though not necessarily to a map. This is a "normal" picture and not what I am looking for, rather something for which the...
  40. P

    Bayesian Network Homework: Equations & Solutions

    Homework Statement Homework EquationsThe Attempt at a Solution For part A I solved for P(B|JC) = P(B,JC)/P(JC) For part B I am thinking P(B|!JC, MC) = P(B, !JC, MC) / P(!JC, MC) For part C I am thinking P(JC|MC) = P(JC, MC)/P(MC) Am I on track with these equations? Especially for part c...
  41. D

    Find phase angle of RLC network

    Homework Statement Please see attachment for circuit and parameters. Homework Equations i --> 90 phase angle for inductor so Z of inductor = 0.5<90 sum of voltages = 0 #<40 = #*cos(40) + i*sin(40)*# The Attempt at a Solution shteii01 - 100 + 0.5<90 + V2<theta = 0 --> 100 + 0.5*cos(90) +...
  42. mooncrater

    Can Symmetry Simplify a Hard Resistor Network?

    the question is , to find the net resistance across the points a and b as marked in the figure(attached).Here I think that the method of Symmetry should work . But I am not sure about it and moreover its not clear to me how to use it.The Attempt at a Solution
  43. D

    Capacitor needed for phase angle change (RLC network)

    Homework Statement An inductive load is connected to a 120V (rms), 60Hz AC source. The load draws 5.0 kW at a power factor of 0.81 (lagging). You need to improve your power factor to 0.96 (lagging) by adding a capacitor. What is the Capacitance needed (in uF)? Homework Equations P/|S| =...
  44. A

    What is the algebraic equation for z21 in terms of V1, R6, and R8?

    Homework Statement Homework Equations As above. The Attempt at a Solution (z11) With the output open circuit (and therefore I2=0) z11 = V1 / I1 = (R8 + R6)I1 / I1 = 14ohms; (z12) With the input open circuit (and therefore I1=0) z12 = V1 / I2 = R6 = 6ohms; (z21) With the output...
  45. JasonHathaway

    Answer:Iph=7A, IL=12.12A, P=65.65W, Q=1538.6VAR, Theta=87.55ْ

    Hi everyone,1. Homework Statement Three inductors with 0.1 H each are delta connected to three phase ac newtork with 220V/50Hz. Determine Iph, IL, P, Q and Theta. Homework Equations Showed at the attempt. The Attempt at a Solution [/B] XL=2*pi*f*L=31.4 ohms Iph=Uph/XL=220/31.4=7 A...
  46. Drakkith

    Why am I experiencing constant wireless network issues?

    So I've been having consistent problems with my wireless connectivity. I ran the troubleshooting option and got the following results: Connectivity Packet statistics Ndis Rx: 12929 Ndis Tx: 7601 Unicast decrypt success: 1845 Multicast decrypt success: 0 Unicast decrypt failure: 0 Multicast...
  47. 22990atinesh

    What can be the answer for this question -- Datapath through 3 routers

    Homework Statement An IP machine Q has a path to another IP machine H via three IP routers R1, R2, and R3. Q—R1—R2—R3—H H acts as an HTTP server, and Q connects to H via HTTP and downloads a file. Session layer encryption is used, with DES as the shared key encryption protocol. Consider the...
  48. B

    Ubuntu 14.04, wireless network cannot connect

    I have recently installed ubuntu 14.04 alongside windows 7 but I'm having major issues with connecting to wireless networks. The networks are detected and show up in the network manager, but when I connect and insert the correct password (double checked), a window continues to pop up saying that...
  49. V

    Resistive Network. - nodal analysis

    Homework Statement http://learn.lboro.ac.uk/file.php/1844/Quiz_figures/Chins_Files/Q11.jpg In the above circuit V1=17 Volts V2=8.5 Volts V3=4.25 Volts I1= 4 Amps I2= 5 Amps R1=4.25 Ohms R3=6.375 Ohms R4=1.0625 Ohms R5=2.125 Ohms R6=2.125 Ohms Calculate the following: a) Magnitude of...
  50. C

    Impedance network and complex algebra

    Homework Statement This is one part of a wider question, I'm only posting the part I'm having trouble with. $$ \begin{align} \text{Given an impedance network } B &= \frac{Z_1 \parallel Z_3}{Z_2 + Z_1 \parallel Z_3} \\ \text{show that: } \frac{1}{B} &= 1 + \frac{R_2}{R_1} + j\frac{\omega CR_2}{1...
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