Thread Definition and 572 Threads

In computer science, a thread of execution is the smallest sequence of programmed instructions that can be managed independently by a scheduler, which is typically a part of the operating system. The implementation of threads and processes differs between operating systems, but in most cases a thread is a component of a process. Multiple threads can exist within one process, executing concurrently and sharing resources such as memory, while different processes do not share these resources. In particular, the threads of a process share its executable code and the values of its dynamically allocated variables and non-thread-local global variables at any given time.

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  1. Arsenic&Lace

    The Should I go to grad school thread

    The "Should I go to grad school" thread So my second year of university is coming to a close, with so far so good grades (hopefully straight A's both semesters), work in two labs (particle physics and computational biophysics) and rounding it out with maybe a summer research position at an REU...
  2. DiracPool

    Animal Haters Unite - Vent Your Frustration Here!

    Yep, you heard that right. Animal haters thread. This is not to be confused with the insect (protostome) haters thead, which several of my, well, anyway... My beef is with the coming spring/sumer season, where all these &*%$#@*& dog owners like to let their noisy dogs disturb my...
  3. B

    Can 1 1/4 NPT Thread Hold 10,000 PSI?

    Hi Guys, My friend is asking me to do the calculation for NPT thread. He is asking if 1 1/4 NPT thread is able to hold 10 000Psi pressure acting on it. In my opinion there is no need to do the calculation for the thread. Of course it will hold it. Don't quote me on this but I think that...
  4. R

    Calculating Tension in a Charged Ball Suspended in an Electric Field

    Homework Statement A tiny, 0.60g ball carries a charge of magnitude 8.0 mircoC. It is suspended by a vertical thread in a downard 300 N/C electric field. What is the tension in the thread if the charge on the ball is (a) positive, (b) negative? Homework Equations Fe=QE? The Attempt...
  5. C

    What is the purpose of the exp[-(t^2)/2] term in Fourier transforms?

    I need more help understanding Fourier Transforms. I know that they transform a function from the time domain to the frequency domain and vice versa, but the short cuts to solve them just straight up confuse me. http://www.cse.unr.edu/~bebis/CS474/Handouts/FT_Pairs1.pdf This list of relations...
  6. D

    MHB Following on to ODE thread 2nd order to 1st

    I am getting this error in Mathematica from the code below: Computed derivatives do not have dimensionality consistent with the initial conditions ClearAll["Global`*"] \[Mu] = 398600; s = NDSolve[{x1'[t] == x2[t], y1'[t] == y2[t], z1'[t] == z2[t], x2'[t] == -\[Mu]*x1[t]/(x1[t]^2 +...
  7. A

    Multiple Languages - Comparison Thread

    Are you familiar with multiple languages? This is the thread to discuss what languages you like the best, what advantages/disadvantages they have over others, etc. I am familiar with C, Python, Ruby, Scratch, and JavaScript. That's all I can think of. IMHO: Python and Scratch definitely...
  8. S

    Summer 2013 Math and Science REU Thread

    Hey Everyone, Just like in years past we should have a thread where we post what REU programs we are applying for and when we get accepted so we know when to expect decisions and stuff. Also feel free to discuss projects and ask questions so we can all help each other out. I thought we...
  9. DiracPool

    What Are Good Physics Books for Casual Reading?

    I always like to have some popular physics book by the bed for "easy" reading late at night. I'm almost finished with my current book, "The strangest man," a biography on Paul Dirac, and need to look for another. Any suggestions? I was thinking of Dancing Wu Li masters, but it seems kind of...
  10. T

    Another reu personal statement thread

    I don't think anyone really likes these threads, but I could use some assistance. Could anyone offer me some criticism on my statement of purpose below, for an REU? This one is really an amalgamation of a couple of ones that I wrote for specifically for different programs, which all more of less...
  11. I

    MHB Probability to be a terrorist when you have no facebook profile [Serious thread]

    Hello all, I know it might sound harsh. I hesitated to disguise my question using another context but I hope some can analyse the exercice despite the emotion. I would understand also if you can't. If mods think i am out of line, please delete the exercice. Lets consider the following 3...
  12. R

    [coupled harmonic oscillators] old thread- need elaboration

    Hi Can someone please explain the answer to the following thread? I tried uncoupling the Hamiltonian but to no avail. https://www.physicsforums.com/showthread.php?t=602106 Thank you.
  13. M

    Screw and mating thread strength equations

    I am designing a mating male and female threaded interface, where the nut is much weaker than the male thread. I need to be able to calculate a few things: A. The maximum force (as preload) required to reach the yield point of the nut material. B. The torque required to achieve the above. The...
  14. H

    Searching for O2 Sensor (specs in thread)

    Hey guys - I've been looking to find an oxygen sensor that fits certain criteria. I've been looking through oxygen sensors on Google and I can't really figure out what kinds of inexpensive oxygen sensors are available that aren't meant to go inside car exhausts. I would really appreciate it if...
  15. N

    Rip time of a string or thread pulled from both sides

    Homework Statement Two bodies with masses m1 and m2 are connected by a massless thread that supports a maximum force |Ft|max . On mass m1 the force F1 = -β t x and on mass m2 the force F2 = 3 β t x (t: time, β: constant) acts. The motion is frictionless. Homework Equations When does...
  16. E

    Calculate the length of the thread -

    Homework Statement The world’s largest ball of string is about 2 meter in radius. To the nearest order of magnitude, i.e., the power of ten, determine what is the total length of the 4mm diameter string in the ball? Homework Equations The Attempt at a Solution I calculated...
  17. DeusAbscondus

    MHB Math and memorization conversation in education (from another thread)

    Jameson, 1. I thought that because what I have integrated is essentially an area that it should be written as squared units (since the unit of measurement isn't otherwise stipulated) 2. thanks for the tip regarding mixed fractions; duly noted! "Using Tactic D-15 ..." You encapsulate my...
  18. dkotschessaa

    Math Club Discussion: Activities, Speakers, and REUs

    Is anybody hear an officer or regular member of your university or high school math club? I'm the vice president of the math club at USF, and I thought it might be nice to have a kind of "conversation" thread where we might exchange ideas. I've posted several separate threads before, but I...
  19. D

    Programs Careers in Industry with Some Physics (Another EE, Physics Grad. Degree Thread)

    Hi, all. I graduated with a bachelor’s degree in physics last spring from a top ten U.S. school and I’m currently looking into graduate programs. My goal is to have a career in an industry that satisfies these criteria 1. Produces practical, socially beneficial results 2. Involves at least...
  20. R

    Programs Another should-i-be-a-math major thread

    Hey you guys. I thought I sucked at math for ages. I remember in algebra class staying up till the wee hours of the morning and still not understanding that substitution concept. I'm still not sure if I should blame my teacher for not explaining the concept at all and generally being a dick...
  21. R

    How do you delete a thread you've posted?

    "Urgent help with Forces, Components, Acceleration" - can someone delete that for me and this one too
  22. B

    Basic Big-Bang ?'s For First Thread

    Basic "Big-Bang" ?'s For First Thread I know this question is on the basic theory of the Big-Bang, but I'd like to propose simpler questions as my first thread starter (I literally just signed up to the site) in hopes to read the forums user replies and thus learning more about the different...
  23. T

    Is the Valve Knob Screw Left-Hand Threaded?

    Sorry for this elementary question, but I'm just trying to avoid making a mistake that will lead to a bigger problem. I'm trying to change out a water valve in my garage. The little old lady that lived here before me pulled a little too far into the garage with her car... (I'm guessing). The...
  24. micromass

    Physicsforums Bibliography: Discussion thread

    This is the discussion thread for the Physicsforums bibliography. In this thread, you can suggest new books to be added to the bibliography and you can make comments about existing books. These posts will be transferred to the actual bibliography thread by a mentor. When suggesting a new book...
  25. A

    Introductury thread, Nice to meet you PF

    Hello guys I just wanted to say hi and introduce my self, my name is Albert I am currently doing my undergrad in Mechatronics engineering and this semester have a crazy electromagnetism professor and -_____- although I've been able to hold my own till know the test is coming and he gave us some...
  26. M

    Study Habits & Strategies: Tips for Upper Level Classes & Graduate School

    Thought this would be a cool Idea - Everyone post your various study tips and strategies for dealing with upper level classes and graduate school I love keeping a detailed log of what I plan on doing during the day,I try to keep every hour filled in eve if it is non academic (Weight Lifting...
  27. S

    LaTeX What's the good LaTex sticky thread now?

    What's the best sticky thread about using LaTex on forum? I looked in my old posts and see I referred new users to https://www.physicsforums.com/showthread.php?t=546968, but that link doesn't work now.
  28. L

    Another what are my chances thread (astro grad).

    Another "what are my chances" thread (astro grad). Some details about me and my undergrad institution: Senior physics undergrad at a Spanish institution recognized in the EU as the home of the most important observatories in the region, big collaborations with U of FL. Rigorous program that...
  29. T

    Two falling spools of thread, which hits first?

    QUESTION: Say you have two spools of thread. Let's assume it's a sturdy, but mass-less thread. You unwrap one spool entirely and gather up the loose thread in your hand in such a way that it doesn't knot, and let it hang from a certain measured height. The other spool you hold from the same...
  30. A

    Dark matter is the thread connecting galaxy clusters

    anyone read this article about latest relevation about dark matter? any thoughts? http://arstechnica.com/science/2012/07/dark-matter-is-the-thread-connecting-galaxy-clusters/
  31. H

    Automotive Another hp v tq thread this ones optimistic

    OK, I'm seriously struggling with this horsepower torque conflict, mostly because of all the god damn bias going around in these forums. It seems that the facts only go so far as to saying hp is a measure of power, and torque is a measure of turning force, then when people try to bring about...
  32. J

    Anime Discussion Thread - Any Anime Fans Out There?

    Any anime fans out here? I was thinking of starting this thread to discuss some of the popular animes like Naruto, Bleach, Death Note, One Piece, Inuyasha, etc.
  33. micromass

    What is your favorite thread on PF?

    What is your favorite thread on PF?? Please vote for your favorite thread.
  34. B

    How to Design Threads to Induce Specific Stress?

    Hi all, I would like to know how to design a thread/screw to induce a specific stress on an object. What I have in numerical data is the stress itself that is required. The application is very similar to that of a threaded car jack. By turning the thread, it will lift up the load that was...
  35. A

    Yet another should I study physics? , thread

    Yet another "should I study physics?", thread Hello folks, First, since this is my first post on the forums, a short introduction. I'm a 23 year old student (pharmacy - 5 years to go!) living in the Netherlands. As far as I can remember I have been fascinated by astronomy & physics...
  36. G

    Another Thread About Solutions Manuals

    I've always looked at the forums here, but never bothered to make an account or post, so this is my first post. Typically inquiries about finding instructor's solutions manuals are locked for advocating cheating, but most of the student solutions manuals I have are total garbage. I like to...
  37. R

    Calculating maximum load on a thread

    Can anyone offer a method or location of a method for determining the permissible axial load that can be applied to an internal thread? i.e. Take a nut and screw into it two bolts, one from either end so they meet in the middle of the nut, then apply a tension force across the two bolts. How...
  38. R

    Internal thread tensile strength

    calculation of internal thread tensile strength Hi All! I've got a coupling device that has two internal threads of different pitch, length, diameter. The smaller thread takes a lifting bolt, the larger attaches to a piece of machinery. I've been asked to work out the safe working load (SWL)...
  39. E

    Understanding 3/8''-24UNF 2B x 1-1/2'' Thread Measurement

    What does the thread note 3/8'' - 24UNF 2B x 1-1/2'' mean? I know that the diameter of the thread is 3/8'', but what's the 1-1/2''? Is that the length of the thread?
  40. O

    Charges on two small spheres suspended from a thread

    Homework Statement Two small spheres, each with mass m = 5.0 g and charge q, are suspended from a point by threads of length L = 0.30 m. What is the charge on each sphere if the threads make an angle θ = 20° with the vertical? Homework Equations F=k|q1q2|/r2 The Attempt at a Solution I found...
  41. P

    Maximum Temp. that a 2 NPT (Pipe Thread) can withstand.

    Maximum Temp. that a 2" NPT (Pipe Thread) can withstand. Hello Forum I have a question related to Pipe threads. Does anybody know the maximum temp. a NPT Thread i.e,( National Pipe Thread) can withstand on a 2" piping without compromising its performance. It has 11-1/2 TPI (Threads Per inch)...
  42. Z

    Belt and Suspenders thread - what safety upgrades should older BWRs get?

    I'll start it off with a nice idea I found in another forum: http://www.energyfromthorium.com/forum/viewtopic.php?f=51&t=3433 Solar panels on the roof to keep battery banks for instrumentation and valves charged. Lovely and relatively inexpensive, might avoid the need for bigger battery...
  43. Ackbach

    MHB Favorite Old Threads - Best Math Thread # 3

    Originally posted by Mazerakham, August 9th, 2010. This problem is a doozy: A circle is in the plane with center at O_a and some radius r_a. Another circle, not touching the first circle anywhere, has center at O_b and some radius r_b. Points A and B are both (arbitrary) points on circle...
  44. Ackbach

    MHB Favorite Old Threads - Best Math Thread # 2

    Originally posted by tracker10 on 2/2/2011. If $\sin(A)+\sin(B)=x$ and $\cos(A)+\cos(B)=y$, then prove that $$\sin(A+B)=\frac{2xy}{x^{2}+y^{2}}.$$ My solution: $$ x= \sin(A)+ \sin(B)=2 \sin\left(\frac{A+B}{2}\right) \cos\left(\frac{A-B}{2}\right),$$ and similarly $$ y= \cos(A)+ \cos(B)=2...
  45. Ackbach

    MHB Favorite Old Threads - Best Math Thread # 1

    Originally posted by Srengam on 9/5/2011: integrate $$\int[(1-2\cos(x))(3+2\cos(x))e^{\frac{1}{2}\,x+\cos(x)}]\,dx.$$ My solution: One way to integrate involves solving a first-order linear ordinary differential equation. First, note that $$\left(\frac{u}{v}\right)'=\frac{vu'-uv'}{v^{2}}.$$...
  46. R

    Parametrization of the path described by the end of a thread

    Homework Statement 2. Consider a stationary circular spool of thread of radius R. Assume the end of the thread is initially located at (0; R). While keeping the thread taut, the thread is unwound in a clockwise direction. (a) Parameterize the path described by the end of the thread as r(t) =...
  47. marcus

    Rosetta's comet mission discussion thread

    This YouTube describes the Rosetta mission Here is the print version: http://science.nasa.gov/science-news/science-at-nasa/2012/02feb_rosetta/ Rosetta is a European (ESA) mission with some Usa instruments on board. It carries a lander that will descend onto the comet surface, take pictures at...
  48. A

    May be another thread regarding high level education?

    May be another thread regarding "high level" education? Just stumped upon a news saying a little girl, who's only 14 and do nothing other than sitting in front of a comp all day, was hired (in my country there are legal holes) by a major outsourcing player as an intermediate software engineer...
  49. wolram

    Art Unleash Your Inner Artist: Share Your Art with Us!

    Are you an artist, let us see your art, do not be a pansy,your art may look good to us.
  50. R

    Bell's Spaceship Paradox - Shouldn't the thread stay connected?

    Hi, I am trying to understand this Bell's Spaceship Paradox , which is basically asking when there is a thread connected between two spaceship (A,B) and an observer C observes a "constant" acceleration, then whether this thread will break or not by Lorentz Contraction. I think the problem...
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