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. gracy

    Electric field lines of positive source charge end on ....?

    I have read that electric field lines of positive source charge end on negative charge and Today I came to know that electric field lines of positive source charge end on infinity,which one is correct?I think electric field lines of positive source charge end on infinity if the positive source...
  2. Salvador

    Exploring the Effects of an Ionic Wire: DC Source and Capacitor Connection

    I have a DC source. then I connect a capacitor from the +ve to ground. if all connection are made from ordinary , copper for example, wires then electrons flow from negative to positive terminals.So electrons from the negative side of the capacitor would flow to the positive. I wonder what...
  3. W

    MHB Source coding with 2 distinct distributions and entropies

    I'm learning about source coding, and many of the books/resources I've read give examples of the source Xn being defined as a sequence of iid random variables. How about when the sequence is independent but belong to 2 distinct distributions (e.g. Px when Xi is odd, and Px' when Xi is even)...
  4. dep0

    What is the Voltage Drop across a dependent current source?

    Hello, I want to calculate the Thevenin/Norton equivalent of a circuit with a dependent current source. I tried to analyse the circuit using loop equations but i don't know how to calculate the voltage drop across the current source. Any help would be appreciated.
  5. W

    Backup Camera with optional power source bypass switch

    I just installed a backup camera on my motor home , which is triggered by the reverse light wire. I would like to add a switch to the circuit so while I'm driving or just to be able to turn on the backup camera (using it as a rear-view mirror) without putting the vehicle in reverse. I probably...
  6. D

    Radiative Transfer Equation: Point Source and a Thin Lens

    Homework Statement Write the Radiative Transfer Equation for an isotropic incoherent point source a distance p away from a thin lens. Assume that scattering in air can be ignored but absorption cannot be ignored. Homework Equations 1. Radiative Transfer Equation (RTE): \frac{dw}{dt} = \left[...
  7. M

    Can hydrogen and helium be used as an energy source for spacecraft?

    Hi. Does anyone advise me what I can get out from space and use it as energy for spacecraft ? Thank. By.
  8. M

    Idea for black body source

    Hi, I am trying to implement a low tech, quick "check" source for our radiation thermometers to ensure they are in good working order between calibrations again a calibrated black body radiation source. My idea was to use an integrating sphere with an incandescent lamp as a source. Then two...
  9. U

    Is this a new and useful source of energy?

    Could you tap into the rotational energy of the Earth by transporting water from the equator to the poles? For example, imagine a large "oil" type pipe that went from the equator to the arctic pole, perhaps located submerged in the pacific. Water would initially be pumped into it to generate...
  10. P

    How to reduce the current of a signal by an exact amount?

    Hello all, The root problem is that I can't put all my analogue inputs onto one input card (each card has 4 inputs) on the project I'm working on. We have four sensors, they should all output 4-20mA. Two are source type outputs, supply voltage goes in, sensor current comes out, current is...
  11. J

    120v DC concrete drillmotor project, good power source?

    Hello every one umm... I am very new at all of this and I need your help. I have a project that I am working on and it involves a 120V 4.5amp DC concrete drill motor and my bike. I am using this motor because it has enough torque and I just got kinda bored lol anyway, I am having a bit of...
  12. A

    Calculating Impedance of a RLC Circuit Connected to a 60 Hz AC Source

    Homework Statement A series RLC circuit is connected to a 60 Hz AC source which produces an amplitude of εmax=20 V. The circuit element values are R= 20 Ω, L= 20 mH, C= 150 μF. Calculate the total impedance of the circuit. Homework Equations Xc=1/ωC XL=ωL Z=√(R^2 +(XL-Xc)^2) tan φ = (XL-Xc)/R...
  13. D

    Need to find the source for a 3D Hooke's law equation to cite

    Homework Statement I am using the 3D implementation of Hooke's law as found in wikipedia at: https://en.wikipedia.org/wiki/Hooke%27s_law I need to find the actual source to cite it in a master's project software write up. Many professors do not consider wikipedia to be an acceptable source...
  14. C

    Selecting the correct power source for a Cockroft-Walton Multiplier

    Hello. I'm in the process of selecting materials for a voltage multiplier. I need to be able to vary a DC voltage source from 0-6kV, possibly with a regulated current up to 20mA...
  15. S

    Nano Fusion? Micro Fusion? Fusion Learning Source?

    When experimenting with fusion, why do we always go so big and make extremely expensive reactors that take years to create and even construct facilities for? I've seen some failed attempts at making fusion happen in carbon nanotubes, failing in the sense that the carbon nanotubes are just...
  16. A

    Can temperature affect the mass of water

    Hi there guys, I'm conducting an experiment to calculate the mass flow rate of water. Bellow is a copy of the procedure: 1) Weigh the mass in kg of a container 2) Connect a flow meter to a tap (any source) with a pipe and insure the departure pipe goes into a sink 3) Open the tap an increase...
  17. T

    Electrical circuit Source transformation Question

    I'm extreeeeamly rusty at basic circuit theory. I want to transform a sort of infinite arrangement of this circuit: The values themselves aren't important, just the representation of what's happening, all the verticle resistors are the same value as each other, and all the horizontal resistors...
  18. G

    Impedance matching of transmission line to source impedance

    Hello I'm now studying transmission line theory. I got to know how impedance matching between characteristic impedance of transmission line and electrical load is important to achieve maximum power transfer and minimize power reflection which causes danger for the system. But the textbook...
  19. pvvijaykumar

    How to plot random source in GNU radio companion

    I am using GNU companion ,in that i am not able to plot random source which i am giving as bytes . how to plot in a sink?
  20. G

    What is source of base current in transistor?

    Hello. Let me think about the NPN transistor (Collector-Base-Emitter order). Here base-emitter voltage is forward-biased (The base is higher than the emitter in voltage.) thus current flow of majority carriers (Here they are electrons in N and holes in P) occurs from emitter to base. In next...
  21. R

    Hybrid HE11 mode of corrugated waveguides as source of axion

    Why HE11 mode of corrugated waveguides would not be a natural source of axion field?
  22. N

    Excitation of electrons by electromagnetic source

    If you hit a bound electron with a photon corresponding to that electron's ionization energy, you ionize the electron. What if you hit the electron with a photon with less energy? Will the photon still add its energy to the electron? Will the electron re-emit the photon with less energy? Do you...
  23. kelvin490

    Question about transformer reflected source

    The following show the idea how a Thevenin equivalent source is used to replace the primary circuit of transformer. https://www.dropbox.com/s/0kaazx1d1srgirz/reflectedsource.jpg?dl=0 https://www.dropbox.com/s/0kaazx1d1srgirz/reflectedsource.jpg?dl=0 In textbook it is commonly stated that the...
  24. B

    Flow of Magnetic Charge: A Source in Ampere's Law? - Bob Eisenberg

    If magnetic charge exists, it can flow. Would the flow of magnetic charge produce a current that would be a source for the curl of B, in Ampere's law? Ever yours Bob Eisenberg Chairman emeritus Dept of Molecular Biophysics Rush University Medical Center
  25. S

    Photons from two sources versus one source

    Assume that we are given a big black box with two windows. Each window emits a laser beam. All our best measurement techniques show that the two beams have the same wavelength and have near-perfect mutual coherence (or as good as the self coherence of each output beam). Is it possible to tell...
  26. S

    AC Current Source: Build an Op-Amp Circuit for µA RMS

    Hi everybody, As part of my research at UCSD, we are trying to measure Hall resistance of some materials. And to do that we need to send an AC current. So I wondered how we could easily build an ac current source, probably based on op-amp. I know there is the Howland circuit (current pump), but...
  27. K

    Energy source for long-term constant gas pressure?

    Gas pressure in a closed chamber at constant temperature will last forever, unless leaking or chemical reactions occur. Examples are methane in underground gas reservoirs that are hundreds of thousands of years old. Gases stored in bottles. Pressure comes from the gas atoms (with velocity)...
  28. N

    What is the power of a sound source placed on a tall radio tower?

    Homework Statement A sound source is placed at the top of a tall (h = 189.6m) radio tower. The source has a frequency of 740 Hz and an amplitude of 19.4 nm at point A. The air surrounding the tower has a density of 1.29 kgm-3 and sound travels through it with a velocity of 343 ms-1. Point A is...
  29. C

    [HELP]Thevenin Norton with dependent source in Transistor

    Homework Statement My teacher gave me a method to find Impedance of Thevenin and Norton. Here is her method: she removed Indepentdence source (voltage is closed, current is open) and did not put V external ( so the dependent source did not working because of no source). And she find resistance...
  30. S

    Using 8 Mega Volts DC as electric energy source?

    If a fusion reactor could be constructed that runs on Li-7 and hydrogen, and if the energy produced by that reactor where extracted with a direct charging setup, like in a nuclear battery emitting alpha particles, the voltage produced would be the stupendous voltage of 8 mega volts. Now, how do...
  31. A

    Determine resonant frequency of an AC voltage source

    Homework Statement Given a series RLC circuit, with one R, one L, and one C element, and an AC voltage source with variable frequency, find the resonant frequency experimentally given an ammeter and a voltmeter. Homework Equations The current in the circuit when the circuit is in resonance is...
  32. thankz

    Need a source for industrial quality water monitor probes

    industrial quality, water proof with corrosion resistant connectors. something a public aquarium would use. it doesn't matter if their capacitance, resistive or voltage sensing. maybe I should have posted this in the chemistry forum but it doesn't really mater I guess.
  33. m4r35n357

    "Simple" 4D Kerr Geodesics simulator, source code and docs

    Looks like my main pet GR project is about to enter something akin to maintenance mode, since it now does all I currently need it to. It's nothing earth-shattering at first glance, but is very concise (e.g. ~100 lines of Python for the simulator script) and should be easier to understand than...
  34. Coffee_

    Poisson equation with a dirac delta source.

    Consider: ##\nabla^{2} V(\vec{r})= \delta(\vec{r})## By taking the Fourier transform, the differential equation dissapears. Then by transforming that expression back I find something like ##V(r) \sim \frac{1}{r}##. I seem to have lost the homogeneous solutions in this process. Where does this...
  35. S

    Two-body experiment using only one laser source?

    (a) Suppose we split a laser into two beams "A" and "B". Is it at all possible to do something to one of the beams, so that, when we bring them back to overlap at the detector(s), they will follow the statistics of two-photon systems? (b) If we use two separate lasers that are phase-locked by...
  36. J

    Looking for the fastest open source library to parse CSV

    I would like to to read and process huge CSV files with millions of records, which we collected from the communications carriers' network.Here is my logic as a simplified procedure: 1) Read the CSV file with FTP protocol 2) Parse the CSV file with my own logic, such as combination, duplicates...
  37. ghalimoglu

    Muon detecting with smarthpones -- need open source code....

    hi everyone, nowadays i am working on muon detecting but i need something cheap. i saw on the internet some people are using their smartphone as a detector with sensor or phones cameras. is there anyone can share their code ? there are some samples but they don't share their code.. only can...
  38. P

    Need help in determining a source of error in an experiment

    Homework Statement It is known that the theoretical resistivity of copper is approximately: 2*10^-8 Ωm. But after I conducted an experiment to find the resistivity of copper, the results turned out to be: 1.68*10^-8Ωm. This is a very small error that can be easily dismissed due to "human...
  39. zonde

    Are photon probability amplitudes entangled in a two-filter setup?

    I have thought for some time that it is physically correct to treat photon source as time evolving rather than photon state (i.e. using Heisenberg picture rather than Schrodinger picture) so I was glad to find this picture in Feynman's book (QED: The Strange Theory of Light and Matter): In...
  40. Q

    What is a good power source for a personal flying machine?

    Hello, I am trying to build a personal (one-manned) propulsion system that will allow individuals to fly above the trees, preferably fast, and for long amounts of time. I plan to do so using propellers. The power will need to be plentiful and long lasting. These are some options that I am...
  41. M

    Engineering Calculating Voltage Source in AC Circuit

    Hello, I'm currently working on a problem involving the calculation of an unknown voltage source of a circuit containing a resistor, inductor and load in series. Unfortunately, the problem sheet does not give an answer at the end, so I am unsure as to whether my approach is correct -- hence...
  42. P

    What is difference between vortex panel method and source me

    kindly help me with a detailed explanation?
  43. I

    Maximum power of circuit with dependent voltage source

    Homework Statement Homework Equations V(oc) = I(sc) * R(th) Kirchoff's voltage law The Attempt at a Solution a) is okay. For part b): After redrawing with the R(th) and V(th) found in part a): Equations of loops: s is I(sc) a is I(left loop) left loop: -8 + a(4000) + (a-s)(4000) = 0 right...
  44. I

    Find current using KVL (with dependent source)

    Homework Statement Homework Equations V = IR Kirchoff's Voltage Law The Attempt at a Solution [/B] Top loop - a Bottom right - b Bottom left - c Ix = x KVL: top: a(6000) + (a-b)(2000) + 5x - 10=0 bottom right: -5x + (b-a)(2000) + b(3000) + (b-c)(4000) = 0 bottom left ...
  45. beyondlight

    Engineering Transistor circuit: Determine source resistance

    Homework Statement Calculate Rs so that the draincurrent ID = 4 mA. Vad does the gain A become? uo/ui? For the transistor: k = 3 mA/V^2 Vt = -2 V also: R1 = 50 k ohm Rd = 2.2 k ohm C = infinity for signalfrequencies image of circuit...
  46. J

    What Are the Best AC Power Sources for Lab Use?

    Hi. I'm joining this forum to ask about some equipment I need. At the community college where I teach, we do a lab in freshman physics where students measure the input to and output from a transformer. My AC sources are reaching the end of their lives, so I'm looking for replacements. As far...
  47. T

    Gate drivers for IGBT inverter: How to isolate V supplies?

    This video describes my issue pretty well (I have it set to start when he talks about my specific situation): ETA: looks like the board doesn't allow the video to start at the specific time, the important stuff begins around 5:30 Our applications are a bit different as his design is for...
  48. T

    Determine source frequency and impedance

    Homework Statement The current in a series circuit of R=5 ohms and L=30 mH lags the applied voltage by 80 degrees. Determine the source frequency and impedance. (Ans: Z=5+j28.4 , f=150.4 Hz) Homework EquationsThe Attempt at a Solution Current in the inductor, IL = Vm/wL*sin(wt-80) Current...
  49. D

    Why is a point light source required for Schlieren Photograph?

    Hi All, I have read articles and watched videos demonstrating and explaining the basics of Schlieren photography but one point that I am not at all clear on is why a point light source is needed. Can anyone offer a general explanation or point me to a basic illustration that might explain...
  50. S

    Error source of SHM experiment

    Homework Statement Investigating the effect of mass on the period of oscillation. This experiment is about SHM of a floating cylinder, and the theory is explained in this website: http://physics.stackexchange.com/questions/64154/shm-of-floating-objects Also, I'm attaching a diagram of my...
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