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. bibo_dvd

    Nodal Analysis , Can't Understand the direction of a current

    Nodal Analysis , Can't Understand the direction of a current ! In This Question "Nodal Analysis" we will apply kirchhoffs current law .. My Question is : Why in Fig 8.51 and 8.52 the currents take these directions ?? i tried to get it but i couldn't Photos : Thanks...
  2. R

    Confused on Voltage Calculations: Using Nodal Analysis to Find Input to Amp

    I have attachted the question as a picture: my first attempt i calculated the voltage through the auxillary circuit to be 10V but i am confused of where the 0.5 A plays in this part, then i used nodal analysis to find the voltage input to the amplifier but up to that point i am confused of...
  3. S

    Nodal Analysis problem with voltage sources

    Homework Statement I have a circuit and I need to find the Nodal Equations that would mathematically describe the circuit, then proceed to finding the voltages at each node using Cramers rule and the currents at nodes 2 and 4. I don't think I would have much of a problem utilising Cramers...
  4. U

    Nodal Analysis- direction of currents flow

    The figure shows a transistor with a bias circuit. If Ic=50IB and if VBE=0.7V, find VCE. My question is: The current through 700Ω resistor is H=[0.7+(51IB(250))]/700, then when KCL is applied at the left hand node, the current flowing through the 3kΩ resistor suppose to be (according to...
  5. C

    Engineering Nodal Circuit Analysis using KCL

    Homework Statement I(a)= 11A, I(b)= 2.5A, I(c)= 3A. Apply KCL at node X to find I(x). This question seems really simple as it tells me what to do and where to do it, but am I missing something or not remembering to apply some concept? The Attempt at a Solution My attempt: I...
  6. E

    Nodal Analysis Help, 1 equation 2 unknowns

    1. 2. V=IR, Nodal analysis 3. Based on where I have drawn my ground, V2=-10V, V1=3I. From this I should just have 1 equation with 1 unknown (if I have done this correct). My KCL equation for node V1 is (V3+10)/8 + (V3-3I)/2 + V3/12. I am stuck, I need to find an equation for I in...
  7. X

    How to Solve Circuit Nodal Analysis for Vx?

    Homework Statement Find Vx. Homework Equations KCL V=IR The Attempt at a Solution First since the undrawn voltage source is in parallel with the 2 ohms resistor. Therefore, I concluded that the voltage source is also -3V For node labeled V1: Iin-(-3V/2ohms)+I from V3 to V1=0...
  8. E

    Nodal Analysis 1 equation 2 Unknowns Problem

    http://imgur.com/W9sWTv7V=IR, that is all I think 3. I have put my ground at the bottom branch. I have tried to write a KCL for the top branch but end up with 0=0 when I substitute in equivalencies. My KCL: (V1+5Ix-0)/20+2+Ix=0. (V1+5Ix)/20=-2-Ix. So 0=0. I am not sure if I am writing my KCL...
  9. J

    Are My Nodal Voltage Method Results Correct?

    The answer i got for V_ao = 14.285 V, V_bo = 11.428 V, I_1 = 0.285 A and I'm not sure if the answers are right, can someone please confirm. Thanks in advance.
  10. C

    Nodal Analysis of a Voltage Dependant voltage source, no pretty answer

    Homework Statement five branches left most branch: 50 Volt source second left most: 10 ohm resistor shared branch between the second left most branch and center: 10 ohms (Voltage drop from left to right= V delta) center branch: 30 ohm resistor between center and second right...
  11. A

    REAL QUICK HELP nodal analysis?

    REAL QUICK HELP nodal analysis?? Homework Statement Homework Equations n/aThe Attempt at a Solution i am having trouble with my nodal equations for nodes 1 and 3. and that's just for the current on the top of those nodes, where the 4V is at. For node 1 my current equation is (V1-4)/0.2 for the...
  12. A

    Did I do the nodal analysis right?

    can someone confirm i did this rite: Homework Statement Find I(x) Homework Equations see the next part please The Attempt at a Solution using nodal analysis method i have 2 nodes and these are the equations i got for each, after simplification: V1: (5/2)V1-V2=21 V2: (5/2)V2-V1=10.5 Using...
  13. C

    Find the voltage Vm (mesh / nodal analysis)

    Homework Statement http://img541.imageshack.us/img541/5039/homeworkprobsg27.jpg Find the value of the voltage Vm Homework Equations V = IR, KVL, KCL, mesh equations, nodal equations The Attempt at a Solution...
  14. N

    How Does Nodal Analysis Determine Currents in a Circuit with Multiple Resistors?

    Homework Statement Using Nodal analysis, determine the current through each resistor, for this circuit. Could you please show the KCL working out.I need the answers Please help me i am helpless with nodal analysis consist of a current source.Thanks in advance :) !.please help me. r1=120...
  15. K

    Nodal Precession Rates of Solar System Planets

    Good Day Everyone, I am trying to find out the rates at which the inclinations of the Solar System's planets change. E.g. Earth's inclination to the invariable plane cycles every 70,000 years. I believe its called the Draconitic Period or Nodal Precession Period. I'm trying to find out...
  16. M

    Engineering Having trouble with some review circuits using nodal analysis

    Having trouble with some review circuits using nodal analysis :( Homework Statement I'm trying to find node voltages for v1, v2, and v3. I = 3.1A Homework Equations V=IR The Attempt at a Solution My method of going about and solving this was fairly straight forward I thought...
  17. G

    Engineering Nodal Analysis on Electrical Circuit

    Homework Statement The Attempt at a Solution According to the similar problem Node X: I1=(22-Vx)/66 I2=(66-Vx)/44 Il=Vx/264 I3=I1+I2+Il Node Y: I4=Vy/240 I5=6 I4=I3+I5 After the calculations I get 1.08 for Vx, which I think is wrong. Thanks
  18. 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...
  19. I

    How many nodal and antinodal lines are there?

    Homework Statement In an interference pattern produced by two point sources separated by 3.5cm and vibrating in phase, the first order nodal line forms an angle of 20 degrees with the perpendicular bisector of the line segment joining the two sources. What is the wavelength? How many nodal and...
  20. T

    Why is my circuit nodal analysis not giving the correct I_sc value?

    Homework Statement The Attempt at a Solution Essentially I am having trouble with solving for I_sc when I remove the load and replace it with a wire. I used a super node at 1 and 4 and also in my diagram I have defined the currents with directional arrows. I have been on this question for a...
  21. JJBladester

    Mesh and Nodal Analysis - Source Frequency

    Homework Statement Mesh and nodal analysis are used to find unknown currents and voltages in planar networks. Why is it necessary when performing these network analyses that all of the source frequencies be the same? The attempt at a solution I know that superposition let's us analyze...
  22. J

    Electrical nodal analysis, find current

    Homework Statement ive tried many things and can't seem to grasp the concept of KCL.i know the node I am looking for is between r1 & r3. i assumed i1+i2=i3. also looking for directions of currents. V1=30v V2=40v R1=82 R2=68 R3=47 Vx = ?Homework Equations i1 + i2 + i3 = 0 ? The Attempt at a...
  23. R

    Solve AC Nodal Voltage V(t) Homework Statement

    Homework Statement I've attached the question. So I'm not sure which method should be used to solve this. I was thinking superposition, but the voltage supplies are are both at the same ω value. Homework Equations v(t) = Vmaxcos(ωt + \phi) ZL = jωL ZC = 1/jωL The Attempt at a Solution convert...
  24. M

    Nodal analysis: simple confusion

    My question about this excercise is the 80+20 part in the denominator. Why and when do I do that? I tried doing it but got the wrong answer
  25. A

    Engineering Nodal analysis for OP amp circuit using superposition

    Homework Statement http://www.wifstrand.se/Albert/stuff/p6.5-9.png I'm stuck with finding v_o1 (voltage over the 10kohm resistor when all sources but the 3 V source, which I've labeled v_1, is set to zero); seems like it should be really simple but I'm missing an equation. Homework...
  26. T

    Writing Nodal Equations for a Thermal System

    So I have to write out nodal equations for a system that I was given, and I started off by drawing out the flow diagram to see where everything was. I'm having trouble starting the nodal equations though. The attachment has 2 diagrams: figure 1 is the correct diagram that models the thermal...
  27. D

    Which Approach is Correct for Nodal Analysis in Electricity Books?

    In nodal analysis method, two books use different and contradicting approaches and not sure which one is correct. One books says that currents at each nodes should be treated independently from the other nodes so that the same current can have two opposing directions in the same equations. The...
  28. L

    Cons and Pros of Nodal Methods

    I'm not sure does Nodal method just simplify and accelerate the solution of diffusion equation or it is accurate instead of simple finite difference methods. Is there any idea?
  29. T

    Engineering What are the Nodal equations for the circuit?

    Homework Statement The problem is explained in the picture. It asks to find the value of Is given that Vo = 6v. http://img24.imageshack.us/img24/9935/circuitst.jpg Uploaded with ImageShack.us Homework Equations The Attempt at a Solution I am attempting the Nodal Method to...
  30. C

    Engineering Circuit Nodal Analysis: Writing Node Equations

    Homework Statement a)Write two node equations in terms of the literal variables. I1 = Is1 I2 = gm2Vo I3 = gm1Va I4 = Is2 Va = Voltage across R2 Vo = Voltage across R1 Vb = Voltage across R3 Homework EquationsThe Attempt at a Solution I tried setting up nodes right above R2 and Right above...
  31. L

    Find V0 in Nodal Analysis Problem with Annotated Circuit and Equations

    I need to find V0 in the given circuit. I've uploaded both the problem, and an annotated one with the variables I chose. These are the equations I got for the system: V_{0}=30-V_{2}-V_{3} V_{2}=30-i_{1}(10\Omega ) V_{2}=I_{X}(2\Omega ) V_{3}=30-V_{2}-(-i_{1})(1\Omega )...
  32. Q

    Finding Vx with Nodal Analysis in a Circuit with Multiple Voltage Sources

    Homework Statement I have to use Nodal analysis to find Vx Homework Equations our prof said that if we want to find the number of unknowns and eqxns necessary then we need to find all the nodes in circuit - the reference node - number of voltage sources, for this circuit that would be 4...
  33. A

    Solve Nodal Analysis Circuit: Find Voltage in All Nodes

    I need to solve this circuit using nodal analysis (find the voltage in all nodes), but i need the actual equations used to solve it. http://dl.dropbox.com/u/202411/p2/circuit328.png All supplied information is there. What I've done is to create 2 supernodes, like this...
  34. T

    Determine the number of nodal line present

    Homework Statement Using a swimming pool, two students decide to test the water by setting up an interference pattern at one end of the 50 m pool. They sit 2.0 m apart and create waves by tapping their right foot, in phase with each other, onto the water at a frequency of 1.0 Hz. The speed of...
  35. A

    Calculating Nodal Forces in a Simple Truss: Homework Solution

    Homework Statement Calculate nodal forces in truss (illustrated below). Homework Equations Force (horizontal) = FCosTheta The Attempt at a Solution Force in node A (horizontal) = FCosTheta = (5000)(Cos60) = 2500 N Force in node A (vertical) = 5000/2 = 2500 N Force in...
  36. N

    Nodal Analysis - KVL Loop question.

    Homework Statement I've obtained the node equations that's in the matrix for rows 1, 2, and 4. I got 3 as well but I'm not sure if my analysis was correct. http://img252.imageshack.us/img252/3151/nodeq.jpg The Attempt at a Solution http://img684.imageshack.us/img684/9803/dsc0010van.jpg So...
  37. W

    Energy present in a localized area during nodal interference

    When two waves interact producing a "cancelling" effect as seen by noise reducing headsets, what kinematic energy is associate with the effected medium immediately near the cancellation point(standing wave)? Furthermore, in an ideal setting, would it be possible to instantly reorient the...
  38. E

    Nodal analysis with parallel resistors

    I'm trying to determine v,oc using nodal analysis. I have labeled the two node voltages at the top v,1 and v,2. When doing the KCL equation for node voltage 2, I run into the 1.1 kohm and 2.3 kohm parallel combination. Is it valid if I just combine these parallel resistors into one resistor?
  39. N

    Nodal Analysis Question - Find the Node Voltages

    Homework Statement http://img12.imageshack.us/img12/6886/nodalanalysisproblem.jpg The Attempt at a Solution I put in the currents for KCL in the diagram, though I'm not sure if I've done it right. So essentially I get the equation as i1 + 3 = i2 + i3 Current in = current...
  40. B

    Nodal and Mesh Analysis Equations for Node Voltage & Mesh Current Methods

    Homework Statement Find the node voltage method equations. Do not solve Find the mesh current method equations. Do not solve Homework Equations NoneThe Attempt at a Solution Using nodal analysis: Node v1 : -Is4+(v1-v2)/2+v1/20-10=0 Node v2 : Is4+(v2-v1)/2+3+(v2-30)/5=0 Looking at this I feel...
  41. genxium

    Question about Nodal Analysis of non-linear component

    When I'm reading a tutorial about Harmonic Balance algorithm (this is a link to the tutorial website), I'm quite confused by the concept it mentions about the nodal analysis of non-linear components, especially for: The non-linear circuit is modeled by its current function i(t) = i(v_1...
  42. S

    Nodal Analysis and Power Balance in AC Circuits

    I'm working on an ac circuit, and we were told to use nodal analysis. Furthermore, we are asked to show a power balance between the sources and the power dissipated in the resistors, along with a reactive power balance between the sources and the inductors and capacitors. I have this formula...
  43. M

    Nodal Analysis (KCL): Correct My Equations

    For the following circuit, can someone please correct my equations for nodal analysis (KCL) I am especially unsure about my second equation because of the dependent voltage source to the left of the node. 1) I1 = (V1 - 3I2)/1 2) 0 = V3/2 + (V3 -V2)/2 3) I2 = (V2-V3)/2 + 2V3
  44. J

    Need help understanding algebra involved with nodal and antinodal lines

    There is a crucial aspect of this unit that I am not understanding and that is how to find how many nodal or anti nodal lines are in the equation. relevant formulas: So if I am looking for how many anti nodal lines exist I use the formula | dsinθmax = n*λ | So let's say I have d and λ d...
  45. J

    Kirchhoff's current law and nodal analysis

    Hello, I'm looking to work out the current at I in the following circuit using Kirchoff's current law and nodal analysis: [PLAIN]http://img853.imageshack.us/img853/4792/circuitgem.jpg Using Kirchoff's voltage law (and loop analysis), I got a current of (35/22)A, but for the current law...
  46. N

    Can someone please explain the solution to a nodal analysis problem to me?

    Homework Statement Homework Equations V=IR, Nodal Analysis The Attempt at a Solution 1 and 2 in the diagram are the nodal equations. Considering that the left node is V1 and that the right node is V2. I don't know how to get from the nodal equations to step 3. I know that you go...
  47. N

    Need help with Nodal Analysis. I have the work, just need a step explained.

    Homework Statement Homework Equations V=IR, Nodal Analysis The Attempt at a Solution 1 and 2 in the diagram are the nodal equations. Considering that the left node is V1 and that the right node is V2. I don't know how to get from the nodal equations to step 3. I know that you go...
  48. N

    Can someone please explain a step to a solution? It's about nodal analysis

    Homework Statement Homework Equations V=IR, Nodal Analysis The Attempt at a Solution 1 and 2 in the diagram are the nodal equations. Considering that the left node is V1 and that the right node is V2. I don't know how to get from the nodal equations to step 3. I know that you go from step...
  49. N

    How to Use Nodal Analysis for Circuit Analysis?

    Homework Statement Homework Equations nodal analysis The Attempt at a Solution When i did the problem, i got 3V. Is this right or wrong?
  50. N

    Can someone please check my signs on this Nodal Analysis

    Homework Statement Homework Equations Nodal Analysis, KVL The Attempt at a Solution
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