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

    Calculating Roentgens from an X-Ray source

    Hey, I want to try to estimate the Roentgens/sec from an X-Ray tube. Here are my calculations, which I talk through so that I am not just throwing equations at you. I would be grateful if someone could comment if they are about right. Stage 1: Estimation of emitted X-Ray strength Assumed: 1...
  2. D

    Source of chloride in seawater

    Most of the salt in seawater is sodium chloride. From my understanding, the primary source of sodium is the errosion of magmatic rocks, which contain lots of feldspars, the most abundant mineral in Earth crust. On the other hand, I don't know any abundant magmatic mineral which contains...
  3. paulmdrdo

    Finding the output impedance of Current Controlled Current Source

    Summary:: I was trying to derive the equation for the output impedance of the ICIS circuit. Here's what I've tried so far. What I have derived does not agree with the one provided in my book. Since it is a current source the negative feedback must increase the output impedance. The one I...
  4. I

    Using multiple alternators at once for a power source

    Hi I need to create a electricity generator, I've got plenty of car alternators and car batteries, all are 12v. I know how connecting batteries in parallel / series, basically i could connect like 20 car batteries to have a 12v massive amperage power bank which would cause an issue with wire...
  5. Ophiolite

    Australian Tektite Source Crater Identified

    Tektites are small (up to a few centimetres), natural glass nodules, shaped as ovoids, spheres and dumbbells. They are found in about ten areas of the Earth's surface. In the 60s and 70s their origin was debated. Possibilities included volcanic ejecta from terrestrial or lunar volcanoes, or the...
  6. Rahulx084

    Thermodynamics -- Temperature of a Heat Source?

    In heat engine we define a heat source from where heat is transferred to the system, we say that heat source has a temperature ##T_h## , When we define a Carnot heat engine, the first process we have is an isothermal expansion and we say heat has to come in system through this process and here...
  7. garthenar

    Engineering Designing an adjustable voltage source using only resistors and a pot

    I need to create a powersupply that takes in a +5 and -5v and has an adjustable output that varies between -2 and +2 v using one potentiometer. I already came up with a design myself but it did not work. I need some help figuring this out. I think my idea for how to get specific positive or...
  8. F

    Temperatures of the hot source and cold sink in a heat engine

    Hi, I was just wondering about the efficiency of a cycle that is not Carnot cycle. In that case one should use \eta = 1-\left|\frac{Q_{\rm out}}{Q_{\rm in}}\right|, where Q_{\rm in} and Q_{\rm out} are the amounts of heat absorbed and released during the cycle. For instance, I guess that in...
  9. B

    Two-point source interference pattern

    I'm having trouble understanding what it's asking me. "Calculate the angles at which the nodal lines in the pattern are located far from the sources." I assume they are very far away, making lines PnS1 and PnC parallel. Is the question asking me to calculate θ' in the example? "nodal lines"...
  10. S

    A Calculating the Gravitational wave spectrum with Inflation as a source

    I am interested in knowing how to calculate the gravitational wave (GW) spectrum with inflation as a source, I have some background in inflation but I am not so familiar about calculating the GW spectrum. I am reading a paper (https://arxiv.org/abs/0804.3249) about it, however, a big part of it...
  11. The Bill

    Geometry Source for a coordinate-based formula for Gauss from Riemann

    I need a citeable source that gives the formula for the Gaussian curvature at a single point of an intrinsically defined Riemannian or Semi-Riemannian manifold given the intrinsic metric tensor and/or Riemann tensor. I've got sources for this already, but I'm not "allowed" to use them for this...
  12. M

    Engineering Dependent source problem using KVL

    Hi all, I was trying to solve this but I'm stuck as you can see in my notes below: Using simulator the I1=3.125 A | I2=-1,857 A | I3=4,375 A and Power of the dependent current source = -46.875 W Any idea, what could be wrong ?Thanks.
  13. sa1988

    C# Open Source C# Physics Library

    TL:DR; I've started an open source C# physics library: University Physics The Long Version So it turns out there's relatively little in the way of full physics libraries written in C# (the best I can find is bepuphysics which seems to be focused only on classical mechanics). With this...
  14. M

    Would a giant orbital gravity battery be a good future power source?

    Gravity batteries intrigue me. We are starting to develop them now. We currently are able to drop cement blocks and harness the energy that the kinetic energy releases. We are considering them as an alternative energy source to help the environment. Here’s a link for those unfamiliar with it...
  15. M

    Engineering Determine if the dependent source of the circuit delivering power or....

    Hi all ! I want a confirmation for this exercise please. The circuit: This is my try: https://www.docdroid.net/EFuTDMp/new-doc-2019-10-03-234340-1-converted.pdf -- Thanks
  16. R

    Engineering Norton/Thevenin Equivalent circuits with a dependent voltage source

    so when I did this problem I did nodal analysis to find the voltage across the 40k resistor, and found it to be 16V. From there I did two source transformations, combined the sources and did some equivalent resistance to get the answer as seen below: However this differed from the answer he...
  17. fight_club_alum

    Determining the voltage polarity of the independent current source

    I am so sorry if I am posting this in the wrong forum; it is just not a homework problem, and I can't find the right place - it's more of a study help question.
  18. M

    Engineering Transient circuit analysis problem with a dependent source

    Hi all, I tried to solve this, but I can't find the R(equal). I use the following method. The circuit: For t<0 the switch is closed so the iL(0-)=4 A For t>0 it opens and the iL(∞)=0 A Now, I want to find the value τ=L/R(equal) Then I will use the: iL(t) = iL(∞) + ( iL(0-) - iL(∞) )* (...
  19. Erik Ayer

    I Two Photon Sagnac Source

    In this paper, Cramer references a Sagnac source and mentions it has a half wave plate to vary the entangement vs. coherence by rotating the plate. Look just below figure 1: https://arxiv.org/pdf/1409.5098.pdf What is this setup? My guess is that the half wave plate is right before the...
  20. S

    Distance between light source and slits in the double slit

    Hi, Does the distance between the light source and the slits matter? Does the interference pattern change if you move the light source closer or further from the slits? I read from this link that the collimation of the light changes with distance and that affects the interference pattern...
  21. KevinTOC

    I How would one calculate the distance and bearing of a signal source?

    Basically, I'm wondering how you can essentially determine the bearing of a signal source, if you know its signal strength. assuming you're in a vacuum, and you have a beacon transmitting a signal, and you know its signal strength. How could you find out the bearing (direction) it's at, if you...
  22. Zahid Iftikhar

    Voltage across R, L and C vs AC Voltage source in RLC Series Circuit

    One property of series resonance circuit is that at resonance, the voltage across circuit elements R,L and C may be larger than the source voltage. I can relate it to vector analogy where component vectors may have larger values than the resultant and the phenomenon is counter-intuitive. This...
  23. QuarkDecay

    I Solving the Horizon Problem: 1 Source or 105?

    It says that since there is homogeneity in the Universe's temperature, all these points must have come from one source (or a source close to each other?) at a certain time. Then it also calculates the number of these sources and it's ~105. But isn't that very dense mass right before the Big...
  24. davenn

    I What is the new source of space radiation discovered near Earth?

    Interesting article ...NEW SOURCE OF SPACE RADIATION: Astronauts are surrounded by danger: hard vacuum, solar flares, cosmic rays. Researchers from UCLA have just added a new item to the list. Earth itself.“A natural particle accelerator only 40,000 miles above Earth’s surface is producing...
  25. Hiero

    I Headlight Effect of Moving Light Source: Formula

    Suppose we have a light source emitting photons isotropically at a constant rate. Call the rest frame of the source S’ and call the photon-flux-density in this frame ##\sigma ‘##. (I’m treating it as a scalar instead of a vector because I’m assuming the light should travel radially in either...
  26. dedocta

    I FRB's source as Rail and/or Coil Guns (or mass drivers)

    Summary: FRB's source as Rail and/or Coil Guns (or mass drivers) Hello, I've been studying rail and coil guns recently, and certain applications of this technology can result in some pretty high speeds with a significant amount of mass. I've been wondering if these FRB's could be a result of...
  27. Q

    Converting source intensity to the maximum reach of beam flux

    We can solve for the maximum 5 lux illumination distance with the above equation. E = 10.76*(35,000/d^2) d = 275 feet (approximately). However, the 5 lux illumination distance is not 275 feet. The 35,000 cd value is not an axial intensity value. It is at a point that is slightly down and to...
  28. Mondayman

    Calculus Where Can I Find More Challenging Integrals for My Competition?

    Hi folks, I love doing integrals, and I think I'm going to start a competition at my school. The integrals in the standard calculus textbooks I have access to, Briggs, Stewart, etc., are pretty elementary. I am looking for some harder integrals. I have the books Irresistible Integrals and...
  29. J

    Source strangulation for an instant water heater?

    Got an electric water heater in my flat, one of those instant ones. It outputs a low flow but this is alright as you mix the hot water with cold water in the shower. Problem is, in the summer you need to mix in too much cold water in the shower and the heater shuts down, probably as it senses...
  30. Solomei

    What is the most ultimate energy source for 2019 and beyond?

    Thinking of 2019 and what kind of information we are being exposed of; What do you think is the most ultimate energy source that should be used from now on?
  31. bagasme

    Other Corporate Blogs: Bad Source for Research Project?

    Hello, I was wondering whether blogs (especially corporate blogs) are good source for research. In some cases, such websites give me facts that hardly found elsewhere. However, when used as research source, corporate blogs can present problems: there is no way to know the credibility and...
  32. C

    The source of the electric field of a battery?

    If you place a zinc / copper battery it will create an electric field pointing from the copper to the zinc and my question is this what makes this electric field , the zinc pushes electrons in the circuit and never "stays" negatively charged for an electric field to be created same for the...
  33. M

    Electric field in a circuit with a DC source

    So I understand that when an electric field is produced in a conductor of length L, the net electric field in the conductor will be 0 because the rearrangement of electrons in the conductor results in the production of its own electric field which cancels out the one produced initially...
  34. Nima_khademi

    Calculating a distributed IR source radiant flux

    Hello everyone! does anybody know How can I calculate a distributed radiant flux of an IR source in a space? Is there any software or something?
  35. Nathan Warford

    B Radio source Hercules A and galaxy 3C 348

    I have found plenty of information about the radio source Hercules A. Its large radio jets are 1.5 million light years long from end to end, the supermassive black hole that produces Hercules A is 3 to 4 billion solar masses, and the black hole exists in the center of galaxy 3C 348. However, I...
  36. user366312

    Explaining the Source Code for Calculating Stationary Distribution in R

    Summary: Kindly explain the source code in R which meant for calculating stationary distribution of a transition matrix. I am trying to understand the following source code meant for finding stationary distribution of a matrix: ### Stationary distribution of discrete-time Markov chain ###...
  37. user366312

    What is the purpose of using the mod operator in this line of code?

    #================================================================== # Build the transition matrix for random walk on n-cycle #------------------------------------------------------------------ n <- 25 # we are creating (nXn) transition matrix r1 <- c(0, 1/2, rep(0,n-3), 1/2) # create same...
  38. uzi kiko

    A Estimate the source of a variable when there are several distributions

    Hello everyone In my study, I inject a different amount of fluid in each experiment, such as 1 ml, 2 ml..., and test the change in the general dielectric properties of the solution. Now that I have done much (over 100) measurements for each injection in a specific volume, one can see that for...
  39. B

    A Point source with Dirichlet Boundary

    hi, all great brains, I have a question about BVP, which confused me a while, maybe someone can help to clarify it. For a point source with Dirichlet boundary in a 2D domain, the response at any coordinate except the source point is dependent on the surface of the source, for example, heat...
  40. S

    Brachytherapy source specifications

    hi every body i use MCNPX with a Z600 with 20Go of ram and 16 core to calculate the dep energy arrownd a source of cobalt with the tally F6, but when i put NPS=3E+9 an erreur apears that '' all entries must be integers''. i want help because NPS=2E+9 dosn't give a satisfaying results?
  41. Electgineer

    Find the power supplied by the 1V source in the circuit using nodal analysis

    My attempt: At node 1 > 4 = 6 + I1 Node 2 > I1 + I2 = I 2 Node 3 > 6 = I 3 + I 4 I1 = (V1 - 4)/21 In node 1, Using the equation for I1, V1 = -38V. I2 = (V1 - 4 - 1)/2 So, I2 = -21.5APower supplied by the 1V battery is P=VI P=-21.5 x 1 P=-21.5W I am not sure of my method, I just started...
  42. nomadreid

    Medical PMC journals as source? Example on "ozone therapy"

    I am having a discussion with a friend who advocates "ozone therapy": re-injection of your blood after being enriched with ozone, done by a doctor. Since I am very skeptical of this fad (all I can see is that ozone destroys double bonds in carbon chains, which does not seem like a good thing--...
  43. Y

    Magnetic force -- does it fall off to zero far away from the source?

    Let's say we have a wire and a circuit is closed the magnetic field start to spread with speed of light c. Then we would have a place " out of range " at which the magnetic field doesn't exist.What is the equation that connects magnetic force with distance with its prorogation of speed of light...
  44. I

    What makes a light source "brighter"?

    Hi all, I am hoping someone could clear up a concept that doesn't make sense to me. I am thinking in terms of a blackbody diagram, which is "Intensity" on the y-axis and wavelength on the x axis. I understand that when you heat something to a higher temperature, the curves shift to shorter...
  45. Electgineer

    Can LaTeX help improve the readability of scanned documents?

    I would upload it soon
  46. M

    Irradiance from this infrared light source after a diffuser

    I need to calculate irradiance in a system shown on the image. There is an infrared LED on the left and a diffuser in front of it. I need to calculate irradiance at a certain distance after the diffuser. I think I first have to calculate irradiance at the diffuser. Then multiply it by the...
  47. J

    MCNP6 Disc Source Setup: Troubleshoot 0 Counts

    I am attempting to build a sodium iodide detector on MCNP. I am using a disc source and I have been trying to define it in terms of a cell that I placed underneath the detector. When I run it, I get 0's for my counts. This indicates to me that my source isn't hitting my detector. I keep...
  48. S

    Engineering DC source rather than a clamper circuit?

    Why is it preferred to use a clamper circuit rather than a DC source to shift an AC source upwards on a voltage-time graph?Both require a battery(DC source) so isn't it cheaper than having to use some extra elements like capacitors and diodes?
  49. jedishrfu

    Microsoft Release the Calc.exe Source Code

    in this article on Ars Technica, Microsoft has released the source code to the Calc.exe app calc.exe is now open source; there’s surprising depth in its ancient code https://arstechnica.com/gadgets/2019/03/calc-exe-is-now-open-source-theres-surprising-depth-in-its-ancient-code/
  50. F

    Implement a DC current source - simulink

    Homework Statement Homework Equations - The Attempt at a Solution Here's my work : When I add the DC current source , it shows a red dotted line and won't connect to other elements . Any help would be greatly appreciated !
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