What is Nodal: Definition and 224 Discussions

Nodal is a secretory protein that in humans is encoded by the NODAL gene which is located on chromosome 10q22.1. It belongs to the transforming growth factor beta (TGF-β) superfamily. Like many other members of this superfamily it is involved in cell differentiation in early embryogenesis, playing a key role in signal transfer from the node, in the anterior primitive streak, to lateral plate mesoderm (LPM).Nodal signaling is important very early in development for mesoderm and endoderm formation and subsequent organization of left-right axial structures. In addition, Nodal seems to have important functions in neural patterning, stem cell maintenance and many other developmental processes, including left/right handedness.

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  1. V

    Apply Nodal Analysis to the Circuit

    Homework Statement Apply nodal analysis to the circuit to find the power (released or absorbed?) by the 3-mA source. [PLAIN]http://img15.imageshack.us/img15/1546/circuity.png Homework Equations Ohm's Law V = IR The Attempt at a Solution OK, so firstly I have to label all the...
  2. N

    Help figuring out nodal analysis

    Homework Statement Homework Equations Equivalent resistance? Nodal analysis? V=IR The Attempt at a Solution I was thinking of using nodal analysis at the points designated by the arrows. The bottom one would be connected to ground. My question is if I picked out the nodes...
  3. PainterGuy

    Nortonization and nodal analysis

    Hi, :) Please have a look on the following link: http://img836.imageshack.us/img836/1554/circuitmm.jpg 1: I was trying to solve a circuit. I was successful except the part where I was trying to apply the nodal analysis (it's at the very end of the linked scan). Where am I going wrong? By nodal...
  4. PainterGuy

    Where can we apply mesh and nodal analyses?

    Hello,:smile: Actually I'm just curious to know when and where we can apply mesh and nodal analyses. Perhaps, you can help me to understand this with some simple circuit diagrams. Thanks 1: To apply nodal analysis we must have at least two nodes. Am I correct? Moreover, we also need one extra...
  5. E

    Solve Nodal Wave Problem: Find Number of Nodal Line & Frequency Increase

    Homework Statement Two loudspeakers connected to the same source produce sound waves in plase with the same amplitude. The frequency of the sound is 215 Hz and the speed of the sound is 344 m/s. A girl finds that when she stands at a point that is 15.0m from one source and 19.0m from the other...
  6. E

    AC Nodal Analysis Adding source phase angles AFTER calculation?

    Just to clarify the title... Basically for the below circuit we are required to find Vth, Rth and Vo. However, the method of solving this problem is a little strange to me, because as you can see, the source has a phase angle of 30 degrees. The solution to this problem basically says (to find...
  7. B

    Understanding Nodal and Mesh Analysis

    Hi guys, I've referenced this forum many times so now its time to join! My problem, I'm having trouble understanding Nodal and Mesh analysis (and when to use each one, and why), especially when inductors and capacitors are present. For example here is a question that was proposed to me...
  8. PainterGuy

    Help with this simple nodal analysis issue, please

    Hi, :) 1: http://img19.imageshack.us/img19/2256/nodaldiagram1.jpg (diagram of circuit and few other details) 2: http://img36.imageshack.us/img36/5405/nodaldiagram2.jpg (solution) The book asks "Find the magnitude and polarity of the voltage across each resistor". I was trying to find...
  9. PainterGuy

    Simple application of nodal analysis

    Hi, :smile: Almost all the details you will find in the given link below: http://img710.imageshack.us/img710/1565/exampleproblemnodalysis.jpg You will find the expected (or, target answers) in the top right corner. As you can see my value for V1 is utterly wrong. It should have been...
  10. PainterGuy

    Engineering Applying nodal analysis on this simple circuit

    Hi, :) Almost all the details you will find in the given link below: http://img171.imageshack.us/img171/9797/nodalysis1.jpg You will find the expected (or, target answers) in the top right corner. As you can see my value for V1 is wrong. It should have been 80V according to the answer...
  11. E

    Nodal Analysis with power supplied to capacitor

    Homework Statement Following circuit has v=30v, r1=20ohm,r2=10ohm,r3=15ohm. A)Determine inductor current (I) and capacitor voltage (Vc). B)Determine power supplied by source before switch is open. Homework Equations KCL P=VIThe Attempt at a Solution I attempted to treat the load plus the...
  12. J

    Engineering Badic Circuit - Nodal Analysis

    Basic Circuit - Nodal Analysis Homework Statement I am trying to find ix and iy. Here is the figure http://tinypic.com/view.php?pic=x2mr93&s=7 The Attempt at a Solution Node 1 -3 + V1/0.2 + (V1-V2/0.5) = 0 -.06 + 0.1V1 +0.2V1 - 0.2V2 =0 -.06 + 0.3V1 -0.2V2 = 0...
  13. B

    Nodal Analysis w/ Controlled Sources

    Homework Statement Find V1, V2 and V3. Homework Equations Nodal Analysis Supernode Equation Capacitance = 1/R KCL & KVL The Attempt at a Solution KCL @ node 0: Ic = v2(-G1) +v3(-G3) Node 1: Ic + I1 +v3(G2+G3) +V2(-G3) = 0 (subbing in Ic) v2(G1+G3) + v3(g-3) = I1....Equation (1) Node 2...
  14. P

    Troubleshooting Nodal Analysis for a 2 PSU Resistor Circuit

    Homework Statement see attached Homework Equations The Attempt at a Solution Hey, I'm having trouble with a 2 PSU resistor NA circuit. here is what I've done: N1=V1 N2=v2 N3=v3 = 0V N4=v4 0=(10-v1)/4K7-V2/10k-(V1-V2)/1K 0=(V1-V2)/1K-(V2-V4)/470-(V2-V4)/1K...
  15. P

    How Do I Correctly Apply Nodal Analysis in This Circuit Problem?

    Homework Statement See attached picture. Homework Equations The Attempt at a Solution I really suck at this and am having trouble understanding the textbook we have. here's my attempt: I'm calling node 1 v1 and 2 v2. so 0=(v1-v2)/4k7+v1/10k+(v2-v1)/1k 0=(v2-v1)/1k+v2/470+v2/1 I know I have...
  16. M

    Modified nodal analysis with Voltage Controlled Voltage Source

    hi, i got a question about mna. i know how to write matrixes with(out) voltage source but i don't know what i should do when my instructor askes me placing vcvs or vccs instead of any resistor. i have lecture notes for vcvs ust like; Vpq=u(mu)*Vkl i should add extra rows and cols. to matrix of...
  17. P

    How Accurate is the Calculated Current I_b Using Nodal Analysis?

    Homework Statement Determine I_b in the circuit below using nodal analysis. http://img8.imageshack.us/img8/1339/circuit39.th.png Homework Equations Ohms LawThe Attempt at a Solution Can someone tell me if i have done anything wrong in my first part of the question. Becuase i am pretty sure...
  18. C

    Solving Circuit Equations with Mesh and Nodal Analysis

    Homework Statement The circuit shown has two inputs, V_{s} and i_{s} and one output V_{o}. The output is related to the input by the equation V_{o}=ai_{s}+bV_{s} where a and b are constants to be determined. determine the values a and b by (a) writing and solving mesh equations and (b) writing...
  19. Saladsamurai

    Circuits: Solve Using Nodal and mesh Analysis

    Homework Statement Homework Equations KCL & KVL: The Attempt at a Solution Ok folks :smile: I am not sure where to go from here. Someone suggested changing the 144V to its Thevenin equivalent, which I have done below. I know that I am supposed to apply KCL at each node...
  20. M

    Nodal Analysis Review Requested: Help Matt Out!

    Homework Statement Im tring to apply nodal analysis on the following, and would like to know if i have done this correctly. Can someone please review it. [PLAIN]http://img121.imageshack.us/img121/5573/lastscanq.jpg Thank you for your time. Matt
  21. Y

    Calculating Nodal Lines for Water Tapping

    Homework Statement Two students are tapping their foot on the surface of the water in a pool Distance between two point sources : 2m length of the pool : 5m freqency : 1Hz v = 0.6m/s How many nodal lines are created? Homework Equations lambda = v/f d = (n-1/2)lambda The...
  22. J

    Solving Nodal Analysis: Find V1 and i1

    Homework Statement Find V1 and i1 using nodal analysis The Attempt at a Solution I know i1 is 0 because of a circuit break. But, I am not able to figure out how many nodes there are in this circuit? I thought there are four nodes connected to the reference point but the book...
  23. N

    Confused about KCL & Nodal Analysis (basic stuff )

    Homework Statement I'm confused about how to use KCL when doing Nodal Analysis. Please consider the diagram below: http://img27.imageshack.us/img27/4900/20091019131641633915550.jpg Homework Equations My first point of confusion is that the diagram shows the current "4Ix" going up...
  24. jegues

    Nodal Analysis/Superposition Problem

    Homework Statement ***NOTE: SEE 3RD POST FOR PROBLEM STATEMENT!*** Homework Equations N/A. The Attempt at a Solution Okay, I have all my work for both my superposition attempt and my nodal analysis attempt and the V_{o} I found are not the same. This leads me to believe I've...
  25. G

    Nodal analysis, setting up the equations

    Homework Statement [PLAIN]http://img844.imageshack.us/img844/8508/circuit.png Homework Equations KCL set ups The Attempt at a Solution I am having trouble setting up the KCL equations The 30V voltage source on the left with the resistor is messing me up, how do I incorporate...
  26. X

    Finding nodal voltages using KCL.

    Homework Statement Where XX is 60V I'm trying to find the node voltages at point A and B, however each time I've tried this and then checked using circuit wizard it has come up incorrect. Yes my circuit in circuit wizards is correct. Homework Equations The Attempt at a...
  27. R

    Solving Nodal Analysis with a Circuit Diagram

    [PLAIN]http://img707.imageshack.us/img707/2437/elect2.png I'm just wondering where I have to put the reference node in this circuit when doing nodal analysis.
  28. G

    Nodal analysis physical problem

    in the nodal analysis -one of ways of analysis DC circuit - i couldn't understand the physical roots of this way . i mean how could i make the voltage of a node equal to zero by make it as a reference point without having any effects on the voltage(electric potential) of the rest nodes ...
  29. C

    Master Nodal Analysis with this KCL Question | Nodal Analysis Homework

    Homework Statement Homework Equations KCL The Attempt at a Solution I recognise that the voltage sources form supernodes. This produces: A - B = 10 -> A = 10 + B We also know that node C is 12v. I then form KCL equations: 6 + \frac{A - C}{12} = \frac{B}{40} + \frac {A}{24} When I...
  30. A

    Confused with Nodal Analysis and Voltage Sources! HELP!

    The question might be simple for you guys but the problem is that it is not for ME ! I have a circuit and I have to determine the node voltages by Nodal Analysis method. And the one which I learned was in cases when we had a current source, I could simply write the equations using KCL...
  31. S

    Solving V0 Using Nodal Analysis

    Homework Statement I have to solve for V0 , using nodal analysis. I am getting different answers in MATLAB and PSPICE. The circuit is below 2 supernodes ; or 1 big supernode Here are my nodal equations: v1-v3 = 12 v3 - v2 = 6 (v3)/6k + (v1)/4k - 6/k = 0 Matlab output is here...
  32. O

    Engineering Nodal analysis algorithm applied to a circuit without voltage sources

    Homework Statement I am having some trouble with the nodal analysis algorithm explained in this web page http://www.swarthmore.edu/NatSci/echeeve1/Ref/mna/MNA3.html My electrical circuits knowledge is very basic, and I need to get the equivalent resistance of a circuit for a non related...
  33. W

    Nodal Analysis using Complex Numbers

    Hi, I would be grateful of any advice on how to solve the problem below. My aim is to find the voltages at nodes 2, 3, and 4, by means nodal analysis and thus creating simultaneous equations and solving them using matricies or matrix in order to prove that these theories work. I...
  34. W

    Nodal Analysis Help using matrix

    Hi, I would be grateful of any advice on how to solve the problem below. My aim is to find the voltages at nodes 2, 3, and 4, by means nodal analysis and thus creating simultaneous equations and solving them using matricies or matrix I understand kirchhoffs law etc however its the...
  35. C

    Using nodal find out v1 and v2

    hi dears, kindly tell me the complete procedre to find out the v1 and v2 v1= -145/8 v2 = 5/2 I have tried it and I reach here Apply Source transformation theorem.The 5A and 3ohms &2 ohms are converted into single voltage source 25V ( 5A*3+2) in series with 5ohms(3+2).But the positive...
  36. M

    Nodal analysis (Node-voltage method) for op-amps?

    Hi, I am just beginning to learn about op amps and I was wondering if there was a way to use the node voltage method (nodal analysis to some) to solve these circuit without replacing the op amp with its equivalent ideal amplifier. To me, it is much faster to use node voltage method than going...
  37. G

    Engineering Nodal Analysis Problem (Basic Circuit Analysis)

    Homework Statement Find v1 and v2 from the given picture. Homework Equations Ohm's law, V=IR Current Division The Attempt at a Solution I tried to use current division. The 6A source split into 2, giving 2A down the 8 ohm resistor and 4 amperes down the 4 ohm resistor. Since...
  38. N

    Understanding Nodal Analysis: How Voltage at Node D is Calculated

    Guys l would like to know how does the the voltage at node D become : Vd=-(Vc-Va)=Va-Vc
  39. C

    Engineering Need guidance on this circuit question using nodal analysis. Confused.

    http://i615.photobucket.com/albums/tt237/chaz0426/Problem2.jpg it asks to solve for V1 and V2 using nodal analysis however I'm not sure how to solve this particular one because there is a voltage source and a resistor between the reference node and V1and I'm not sure what to do. Here is what...
  40. G

    .Understanding Nodal and Elemental Stresses

    Hi Can you please help me here? I want to know: 1- the difference between nodal stresses and elemental stresses. 2-How the computer uses these stresses if it is to use strain energy as the convergence criteria? 3-How the sub-structuring technique can be used to model large structures...
  41. E

    Help write the Nodal equations and solve V1 &V2

    Can someone solve this circuit? Find v1 and v2 in the circuit. I know that we have to make somethng with source conversion ,please I need help. Thannnnnnk you.
  42. W

    Basic Alg. Geometry: Nodal Singularities. Attn Wonk.

    Hi, everyone : I am reading about "Nodal singularities" ,and I have not been able to find a clear def. of what they are. Neither of the standard sources: Wiki, Google, or some of the books I have checked, has a clear explanation. Here is the context: We are trying...
  43. A

    Can I Use My TI-84 for Nodal Analysis with Rectangle and Polar Form?

    Hi, I was wondering if it's possible to solve nodal analysis problems that include rectangle and polar form using the TI-84. It just gives me an error when I put in "i" as in imaginary when trying to put up my matrix. I've read it's possible to do with the TI-89, but I'd really rather not...
  44. R

    Finding Nodal Surfaces in Wave Function of H-Like Atom

    Homework Statement One wave function of H like atom is \psi=\frac{\sqrt{2}}{81\sqrt{\pi}a_{0}^{3/2}}(6-\frac{r}{a_{0}})\frac{r}{a_{0}}(e^{\frac{-r}{3a_{0}}})cos \theta How many nodal surfaces are there? 1)1 2)2 3)3 4)none of these The Attempt at a Solution Its an objective...
  45. A

    Nodal analysis with 2 voltage sources

    Can someone solve this circuit Find v and i in the circuit. I know that we have to make somethng with supernode, but where the supernode is here? How to develop this problem? Please help me :) Btw it is nice forum, today i have found that. I hope I will be able to help you in other...
  46. A

    Electric Circuit to solve with nodal analysis

    Can someone solve this circuit Find v and i in the circuit. I know that we have to make somethng with supernode, but where the supernode is here? How to develop this problem? Please help me :) Btw it is nice forum, today i have found that. I hope I will be able to help you in...
  47. L

    Benefit of using Nodal method instead of finite difference method?

    Nodal Method?? What's the benefit of using Nodal method instead of finite difference method in solving a diffusion problem?
  48. S

    Anomalistic, Sidereal, Nodal month, etc

    Anomalistic, Sidereal, Nodal month, etc... Earth's moon's anomalistic, sidereal, and nodal months all take about the same length of time to complete within a few minutes/seconds of each other. Why is that? Can one be independent of the other? Let's say that instead of the moon's typical...
  49. M

    Calculating Voltage and Power with Nodal Analysis

    Homework Statement Consider the circuit shown (attached). Calculate the voltage v and calculate the power for the 2A current source. In this particular case, is it supplying or absorbing power? Homework Equations The Attempt at a Solution I know that there is 2A flowing around...
  50. M

    Solving Circuit Analysis with Nodal Analysis - Help Needed!

    Hey guys. I have attached a circuit that i am trying to analyse using nodal analysis. This is how i am doing it: at node 2: (v2-v1)/1 + v2/4 + (v2-v3)/1 = 0 at node 3: (v3-v2)/1 + v3/2 = 4A at node 1: v1/25 = 2A but i am not getting the right results for v1, v2 and v3. Can...
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