What is Source: Definition and 1000 Discussions

Open source is source code that is made freely available for possible modification and redistribution. Products include permission to use the source code, design documents, or content of the product. It most commonly refers to the open-source model, in which open-source software or other products are released under an open-source license as part of the open-source-software movement. Use of the term originated with software, but has expanded beyond the software sector to cover other open content and forms of open collaboration.

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  1. N

    Measuring the Optical Power of a Pulsed Source

    Hi. I was wondering if someone can provide me with some advice on the proper way for measuring the optical power of a pulsed laser system? My optional methods are: - Photodiode detector: measuring average power - Oscilliscope with optic-electric converter...
  2. B

    Seeking Computer Vision Source Code for Texture Analysis

    Dear All, I am working on digital image processing. I want to do texture analysis. I need computer vision source code. I could not find the source code. If you have these source code please share me.
  3. A

    Can i heat a wire to above degrees with a low cost battery source

    Firstly i need to heat a wire to around 20 degrees or over using a low power battery which could last up to 24hours. what kind of wire is easiest to heat up? would AA battery's work? what would be a long lasting battery source? can it be done? please help me! thanks
  4. P

    LaTeX Can't see Latex source in Linux (Firefox)

    I understand that I should be able to see the source for formulas/equations/math symbols people put in their posts, by right-clicking a symbol or equation. I seem to recall that I could do this but I am unable to do it now in Firefox (Ubuntu Linux Lucid). Is there something I need to install...
  5. Orion1

    Mathematica How Can Mathematica Extract and Reuse Output Values for Further Computations?

    \text{In}[1]:=\text{Solve}\left[\partial _{\theta } \text{Sin}[\theta ]==0,\theta \right] \text{Out}[1]:=\left\{\left\{\theta \to -\frac{\pi }{2}\right\},\left\{\theta \to \frac{\pi }{2}\right\}\right\} Is there a Mathematica source code command that can read a specific numerical value from...
  6. T

    Can a Smaller, More Powerful Microwave Source Replace Triode Amplifiers?

    I have been working with a large number of triodes amplifiers in parallel pulesed by a large thyratron tube. Earlier, many of the triodes decided to arc and melt. The amplifier was huge and I need to replace it. I need a design for a microwave source that is small and more powerful (megawatts)...
  7. Darken-Sol

    Harnessing the Energy of Lightning: An Endless Source of Power?

    why can't we harness the energy in lightning? it seems to be an unending supply of electricity.
  8. M

    Trapping Light: An Infinite Source of Energy?

    Knowing that light goes on in infinity. Would it theoretically be possible to trap light between two mirrors? And have an infinite source of light which would require no energy once it has been trapped.
  9. O

    Understanding Email Message Source: A Problem Analysis

    Consider the email message source below, and answer the questions that follow. Return-path: <xxxx@xxxx.xxx> Received: from cs.smith.edu (scinix.smith.edu [131.229.72.8]) by gwsmtp1.smith.edu with ESMTP; Fri, 29 Apr 2011 10:17:33 -0400 Received: by cs.smith.edu (Postfix) id D8D19EEC01...
  10. S

    Can sound from any source create thrust?

    Can sound from any source create thrust?? hi there, since I'm new to this forum, i don't know whether this the place to put up a question like this...! if I'm wrong my sincere apologies let me head to the topic now... i wanted to whether the sound waves created form any source can...
  11. J

    Double Slit and coherence of non-point source

    If a "line" source of visible light is not really a line but has a width of 1mm, how far must it be from a double slit which it illuminates in order for the two slits to be reasonably coherent? Assume the slit separation is .5mm. I approached this problem the same as finding the distance...
  12. S

    Node voltage w/ voltage source

    This question has been driving me crazy because i am unsure when i am able to apply voltage division to portions of a circuit i try to analyze. I know the potiential difference across a voltage source always needs to be equal to the value of the voltage source but, if the branch coming out of...
  13. J

    Second Order RLC source switching cct

    Hey guys I'm just wondering if I'm on the right track for the problem. I have started analysing the circuit, but I'm really unsure of my method of analysis. Did I use the formulas correctly? :confused: The circuit switches from position "a" to position "b" at t=0 and I'm trying to fined...
  14. J

    Thevenin Equivalent with dependent source

    hi :smile: I'm having some trouble figuring out the Thevenin equivalent for this circuit. As you can see, there are two dependent sources (current dependent current source & voltage dependent voltage source) and no independent source. I have started trying to analyse the circuit by...
  15. C

    Find (practical) current source constants, I and R

    Homework Statement A practical current source has a current of 22 A. Loading the source with 50 \Omega results in terminal voltage of 390.3 V. Obtain the source constants, I and R.Homework Equations V=I\times RThe Attempt at a Solution In my clumsy picture below, shouldn't I_{load} be replaced...
  16. L

    Measuring current on a loop without a conventional source

    Greetings, I have a problem that's been bugging me for a few days now. I've asked electrical engineers, students and graduates, and I can't seem to find a clear-cut answer to these questions. THE SCENARIO One piece of copper wire has one end connceted to a terminal from a multimeter...
  17. T

    Heat Conduction with a nuclear source

    In Bird, Stewart, Lightfoot "Transport Phenomena", they post the following equation for heat conduction with a nuclear heat source: Sn=Sn0 [1+b(r/R)^2] where Sn is volumetric thermal energy, r is radius and R is radius of the fuel pellet. The text state that b is a dimensionless...
  18. G

    Current source = Total current?

    If a circuit schematic contains a current source, is it safe to assume I(total) is that value?
  19. S

    500 ohm resister fed from 120 VP-Pac source

    Homework Statement a 500 ohm resister is fed by 120 Volt P-Peak ac source;How much heat does the resister dissipate if the signal is a sine wave or a square wave? Homework Equations The Attempt at a Solution
  20. PainterGuy

    Current source, voltage source

    Hello everyone,:wink: I am having difficulty understand the concept of current source and what it really is. I have written down below what I think of current source. Some things I said will be wrong and there could be possibility that some are not wrong!:tongue: Now you help me out please...
  21. R

    What Faculty Should I Choose for Studying Alternative Energy Sources?

    Hi, this year I am applying for university, undergraduate course. I'm interested in physics and looking for course connected with alternative source of energy, like from new type of batteries to solar energy to nanoenergy. What type of faculty should I attend? I'm not fond of studying...
  22. X

    Why aren't we using Hydrogen as a source of fuel for cars?

    What I mean by the title is, why isn't it more popular? (I know there DO exist some hydrogen powered cars.) To me it just makes sense to use hydrogen. It is very explosive and it's byproduct is water! The only draw back I can see is storing the gas in the vehicle to be used. Can anyone...
  23. S

    Can You Substitute a Different Power Source for a 9VAC 1.3A?

    Hello i need a 9VAC 1.3A source but it's hard to come by... is there a way i can use a similar source? i don't know too much about this sort of thing but from what i understand the power output is more important than the individual current or voltage out... is that right? for example, my...
  24. D

    LED Array Power Source Problem

    Greetings, I am rather clueless about this stuff so I'll leave it to you guys to come up with any bright ideas for this. I'm building an array of LED's for my high school that flash to music. I'm using a TIP31C transistor to get this effect. My problem is they're wanting a 1 foot by 1 foot...
  25. S

    Thevenin Equivalent Circuits with Dependent Source

    May anyone please help with the method of getting Thevenin Equivalent resistance (RTH) for the attached circuit. I have already found VTH to be 8V. Sim
  26. E

    Finding Resolution for PIPS Detector Using Am-241 Source

    Homework Statement Determining the resolution for a new PIPS (Passivated Implanted Planar Silicon) detector. I've done this earlier for a Ge detector, but that was easy because the two peaks of the Co-60 are far apart. For this measurement we use the normal Am-241 source which has two...
  27. E

    Net Flux from isotropic source

    Hi everybody. Apologies for asking what may be a very simple question, but in every textbook I've read, they say that the net flux through an area dA from an isotropic emitter is zero. But it also says that the sun is an isotropic emitter. Now hold on, the net flux from the sun is clearly...
  28. M

    Doppler Effect, Stationary source moving observer

    Homework Statement My books states, considering a stationary source emitting waves at frequency f, such waves having velocity v, and an observer approaching the source along a linear path at velocity vO we have that: The observer registers the velocity of the waves at v+v0. Up until now all...
  29. A

    Using Mesh Analysis to Solve for Current and Voltage in Complex Circuits

    this question is part of my electronics CW, I've done it before, but briefly. and looking back at all my old notes I've realized that every single one I've done before has 2 sources and only 2 loops, whereas you can see from the image below that this has 3 and its getting me in quite a...
  30. S

    Thevenin with dependent voltage source

    Homework Statement Find Rthev as seen by terminal (a,b) http://cid-3c099006138591f8.office.live.com/self.aspx/Pictures/IMG^_0337.JPG Homework Equations Can somebody point me to the right method to solve this problem. I know how to solve when there is a dependent source, but the dependent...
  31. 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...
  32. A

    Why Is Internal Resistance Shown Differently in Voltage and Current Sources?

    why the internal resistance of energy source or cell is shown in series for voltage source and in parallel for current source? thanks.
  33. D

    Questions involving more than one voltage source

    Consider the following circuit. Using superposition determine a) the magnitude and b) the direction of the current going through R_1 (is it away from node a?). Dtermine the c) magnitude and d) direction of the current through R_2 (is it away from node b?). e) Find V_{ab}. a) First, I will...
  34. T

    NPN Transistor - Sink or Source?

    All electron flow nuances aside, let's look at simple circuit analysis. Hopefully you guys can clarify something for me. Say we have to drive an LED. We have a +5V source, a 3.4V forward voltage, and a 150 Ohm current limiting resistor: +5V --> Resistor --> LED --> GND Okay, so let's...
  35. A

    Photon flux from blackbody source

    Had a quantum assignment recently and one of the problems was: What is the photon flux (photon cm^-2 s^-1) at a wavelength of 600nm at a distance of 1km from a blackbody soiurce at 2000k emitting 50W of radiation between 400nm-700nm. My thinking was: This involves Planck's radiation...
  36. S

    Source of energy for white dwarf and neutron star

    I know that nuclear fusion is the source of energy for our sun and most of the other stars. Neutron stars and white dwarfs have very high surface temperatures. What is the source of their energy?
  37. T

    How Are Electric Forces Related to Electromagnetic Waves?

    Ive heard it said that electricity and megnetism are brought about by electromagnetic waves, but arent electric forces the cause of the other 2?
  38. S

    LC oscillations with DC source

    Homework Statement Suppose we have a circuit with the inductor, uncharged capacitor, ideal battery with emf E all in series. At t=0, the circuit is switched on. The following takes place sequentially: 1. Current at t=0 is max. Battery charges capacitor, current decreases. 2. inductor...
  39. U

    Internal resistance, dual power source problem

    Homework Statement An emergency supply consists of a small diesel engine driving an alternator. The output of the alternator is rectified and smoothed to produce DC. This has has to supply 10 amps of 110V emergency lighting and charge a 110V battery of internal resistance 2 ohms, If the...
  40. C

    When should i (on paper) pump a network with a source to determine values?

    i understand that there are times when one should (on paper) pump a network of resistors, capacitors, and inductors with a 1 amp ac current source or a 1 volt ac voltage source in order to determine certain values within the system however, i am having trouble determining when i need to use...
  41. Evil Bunny

    Let's say we have a 120 Volt AC source

    Trying this again from a different angle... Let's say we have a 120 Volt AC source. We'll call it a generator. This generator is not touching the earth. Let's just pretend that it's suspended in mid air with nothing at all connecting it to the ground (the earth). On this generator, there...
  42. JJBladester

    Finding f_L as Source Speed Approaches Speed of Sound

    Homework Statement Imagine that the source is to the right of the listener, so that the positive reference direction (from the listener to the source) is in the +\hat{x} direction. If the listener is stationary, what value does f_L approach as the source's speed approaches the speed of sound...
  43. S

    Discharging a high voltage capacitor using a low voltage source?

    Suppose a capacitor is initially charged up to 2V, and then a 1V DC voltage source is used to discharge the capacitor to 1V, what is the energy consumption from the voltage source and what is the total energy loss? Assume the capacitor is connected to the voltage source using a resistor and...
  44. R

    I am not sure the source of error of simple pendulum experiment

    Aim: To measure the acceleration due to gravity using a simple pendulum. source of error 1. The length of thread between the bob and the coins is not measured by very accurate instruments. Since meter ruler has a large percentage error, as a result, it should be replaced by a vernier caliper...
  45. D

    Find the distance from the source of power

    Homework Statement A point source power outputs a power of 100 W. If a decibel reading of 118 dB is heard, what is the distance to the observer. Homework Equations I = P/(4*pi*r^2) The Attempt at a Solution This should be simple, but for some reason my numbers aren't matching up...
  46. S

    Do Capacitors Drain the Source?

    I hooked up four capacitors in parallel to a solar charger and found that they all acquired the same voltage. Why is this? I thought that capacitors took energy from the source, which would imply that the second, third, and fourth capacitor had less voltage than the previous one.
  47. 1

    Two-point source interference pattern

    Homework Statement A two-point source interference pattern is generated by sources operating in phase at 1.0 Hz. The sources are 2.0 m apart and the wavelength of the waves is 0.60 m. At what angles, measured from the centre line of the pattern, are the nodal lines produced located...
  48. Simfish

    Impedance across AC voltage source

    Homework Statement An impedance 1000(1 + i) Ω (and note it contains an imaginary part) is connected across an AC voltage source of amplitude 10 V and frequency 60 Hz. Whatʼs the power dissipated during one cycle within the impedance? Homework Equations P = Re(V*I), where V* is complex...
  49. J

    Understanding the Source of Electronics: A Beginner's Guide

    I have just read the following line: A vacuum tube was a glass device which used filaments as a source of electronics and could control and amplify electronic signals. Please remember that I'm not a student of science or math, so please keep your reply simple as much as possible. What...
  50. J

    How Do You Calculate Current and Power in a Circuit with a Dependent Source?

    Homework Statement In the circuit above, use R1 = 4Ω, R2 = 3Ω, V0 = 10V, and k = 1/5 Find the value of ix Find the power delivered by the dependent source 2. The attempt at a solution So what I assumed was that Ix+kIa=Ia so k=1/5 so Ix=(4/5)Ia then the equation for Ix would be Ix +...
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