Link Definition and 243 Threads

Hi, I was working through a Twistor paper and it was explaining the link between holomorphic vector bundles and anti self dual gauges and it had an equation like this, for electro-magnetism. \lambda^a \lambda^b(\frac{\partial A_{b\dot{b}}}{\partial x^{a\dot{a}}}-\frac{\partial...

Can someone supply me with a link to a good article or book, or anything, that gives details on the type of detector that determines "which way" in experiments where the double-slit interference pattern is cancelled? DC

While reading an older article by Schrodinger on Causality a question occurred to me about the nature of energy/time characteristics of light emitted by electron orbital decay. I have been thinking for some time on the relationship/contrasts between generation of lower frequency (ie radio)...

Homework Statement The instantaneous configuration of a slider crank mechanism has a crank GH 10cm long, the connecting rod HP is 50cm. The crank makes an angle of 60 degree with the inner dead centre position and is rotating at 110 rev/min. Determine the velocity of the piston P and the...

I'm trying to understand a bit about CP violation and how it relates to neutrino oscillation. I have a book, "Introduction to High Energy Physics" (Donald Perkins) which says that the probability of observing no change in the flavour of a neutrino is equal to that of an antineutrino of the same...

My apologies for the lack of understanding of the topic, and it may be a bit from left field, but; Is it possible that the positive and negative attributes of the amplitude of electromagnetic radiation is the same positive and negative attributes of atoms, i.e. protons and electrons. Perhaps the...

Homework Statement I have a three link revolute manipulator at the origin. I know all the link lengths. The joint angle for the third link is coupled to the second such that Theta3 = k*Theta2. I want to determine the joint angles (thetas) of the manipulator given that the third link should...

I have a three link revolute manipulator at the origin. I know all the link lengths. The joint angle for the third link is coupled to the second such that Theta3 = k*Theta2. I want to determine the joint angles (thetas) of the manipulator given that the third link should lie on a line an angle...

Homework Statement If the network layer is sending a message from A to D via B, it can be sure that a message sent by the data link layer from A to B will always arrive at B, and from B to D will always get to D. How is it possible for the network layer not to be able to correctly deliver a...

Does anyone know what theyre talking about here, link below: Too scared of the pictures to read the article, but can't stop trying to figure out what the article is about. Are they saying that it is a breed of shark, and they all look this way, or are they saying that there is one specific...

I am an amateur on physics. Lately I have been thinking about this: Is there a link between quantummechanical probabilistics and entropy? I can put it into words like this: "Entropy: The greatest possible chance that outcomes even out (are as similar as possible)." For instance: The chance...

Hello every one I am confused between two support type: the pin, and the link On the textbook, it says, the pin prevents the object from translating vertically and horzontally, therefore, it provides fx and fy reaction forces. but another type of support is much identical to the pin...

A chain consisting of five links, each of mass 0.1 kg, is lifted vertically with a constant acceleration of a = 2.5 m/s2. Find the magnitude of (a)the force on link 1 from link 2 (b)the force on link 2 from link 3 (c)the force on link 3 from link 4 (d)the force on link 4 from link 5...

Hey guys, I am currently working on a project and need to model the tubing configuration as shown in the first attachment. Experimental testing has been completed and I have detailed data for the strain and vibration velocity as required. I need to model this in ANSYS to compare the...

Present critical density of Universe rho_crit = 3 H^2 / 8 Pi G H = Hubble Constant = 2.2E-18 sec^-1 rho_crit = 8.6E-27 kg / m^3 What particle mass does this represent? The length scale associated with a quantum particle of mass m is the Compton wavelength lambda where lambda =...

Homework Statement Hello all. First of all I should mention that this is not a homework problem. Rather, during workplace research I have come across the following two equations in a journal paper. Here, the authors state that one equation can be shown to be the Laplace Transform of the other...

Homework Statement http://www.physics.wisc.edu/undergrads/courses/spring09/248/HWSolutions/HW6Solutions.pdf My question regards to part b of the problem on the 1st page. Why is the radius to get the charge density the radius of the outer sphere and not just the radius of the cylinder...

can anyone recommend me a good book or any internet link to study microcontroller atmega16 from very basic to advance level iwnat to learn only one controller and someone revommend me that you should learn ATMEGA16 SO please help

http://sciencejobs.blogspot.com/2005_02_02_archive.html completely crushed my heart

Hi everyone, I'm not sure if this is the right section to post this in, but the question doesn't really seem to fit any singular category, so I'll try this one (if someone has a better recommendation, please let me know!) The question I'm seeking to answer is this: A baseband signal of...

If mass is a condensed form of energy, can we likewise consider that energy is a condensed form (or store) of momentum at the molecular/atomic/particle physics level? IH

"NASA is releasing the first images and sounds of an electrical connection between Saturn and one of its moons. The data collected by the agency's Cassini spacecraft enable scientists to improve their understanding of the complex web of interaction between the planet and its numerous moons...

They're both this? http://img37.imageshack.us/img37/4795/acccelerationrotational.jpg

I am a newly graduated mechanical engineer and I have difficulty conceptualizing what sort of strictly mechanical mechanism I could use to transmit the force available from a centrifugal sensing device at the main shaft of a prime mover all the way to a stop valve to shutdown the plant. I need...

If there have html or any code to open a link into other tab( not new window and with right-click of the link)?

Dear list, Imagine a table of upper surface area S sitting in an open field, with nothing on it. We know that S is subjected to a downward atmospheric pressure P due to a cylindrical column of air of volume V extending vertically from S to the end of the terrestrial atmosphere. Assume this...

Hello everyone, i just graduated from a Nigerian university with B.ed in Physics,but am more interested in becoming an aeronautic engineer. How is this possible? Though am very good with calculations (both in maths & physics) but has not had any tactical skills to that effect. I want to know...

I am designing a fusable link for the axle shafts on my atv and I am having trouble calculating the torsional strength of my fuse. I want the fuse to fail at about 80% of what the axle shaft would fail at. The axle shaft is .875 inch diameter 4140 alloy steel that has been annealed and quenched...

Is there a PCIe cable system available that attaches to a standard PCIe Board Edge Connector or Mother Board PCIe slot? I see Molex has the iPass cabling system for PCIe board to board connections. But based on the Molex connection pinning (68pins for x8 PCIe) it is more of a custom solution...

I have been using etap 7.5 demo and have been trying to model an HVDC link connected to 2 buses and conduct a load flow analysis (there is also a generator in swing mode attached to one bus and a normal transmission line connecting the two buses to satisfy the simulation requirements), but it...

Homework Statement Determine \int sec(2x) dx for interval \frac{3\pi}{8} - \frac{\pi}{2}The Attempt at a Solution I get \frac{1}{\pi/2} ln (sec(\frac{\pi}{2}x+tan(\frac{\pi}{2}x))-\frac{1}{3\pi/8} ln (sec(\frac{3\pi}{8}x+tan(\frac{3\pi}{8}x)) I am unsure how to simplify this further...

Any help is appreciated on this: This is the projection on the x-axis of a 2-bar linkage. I need to find the PDF of the end of the second link (point B) 1. Link C of length rC is pinned at the origin and its other end is pinned to link B at point C. Its length projected on the x-axis is...

Homework Statement Freq band uplink: 13 - 14 GHz downlink: 10 - 11 GHz transponder bandwidth: 5 transponder x 54 MHz channel using linear polarization EIRP = 59 dBW G/T = 13.5 (max) dB/K QPSK modulation Homework Equations If each user is offered data rate of 256 kbps, with bit...

Link between Thermo and Special Rel? Ok, here's the situation: my friends and I were having a sleepover, and right before we slept, we started to talk about physics (lol... what nerds we are...). I began by saying, what if we achieve absolute zero. My friends said, we already achieved absolute...

I ve seen here some link to PBS nova website, where it were some short sketches about gravity dark matter strings etc etc... may u please remind me that link... coz I ve gone throught the forum and could not locate that thread. I went directly to Nova website and there also could not see all...

Bear with me if you've read or done a problem like this before, I just thought of it while watching the lecture on Hooke's Law http://ocw.mit.edu/courses/physics/8-01-physics-i-classical-mechanics-fall-1999/video-lectures/lecture-10/ by Walter Lewin of M.I.T. and probably couldn't solve it...

My friend who thinks we were "created" keeps telling me that there's no link of a human evolving from a previous species.. Now I keep telling that there's tons of evidence in museums & whatnot, but is there any good links online that can clearly show him?

I want to interface two processing boards with PCI express x8 and connect them with cables. I find 68-pin off-board connectors for x8 connection (by molex) where as there're 98 pins for edge connectors. How do I match these 98 to 68? Are there some documents talking about this? I read PCI...

Homework Statement if i have a three link massless manipulator (each with length l1 l2 l3) that has rotational springs at each joint, k1 k2 k3, and I apply a force on the third link, what will be the joint angles at equilibrium? Homework Equations k = Fd/theta The Attempt at a Solution...

Hello from Australia, I'm extremely worried. I rarely use mobile but unfortunately I had no choice but use a prepaid wireless usb modem which uses the same technology of the mobiles here and I have been using it about 10 hours a day for the last 9 months so if WI-FI gives cancer, then I'm...

Could quantum mechanics be related to dark matter? As in new 'stuff" is being made therefore pushing the time space in between galaxies apart. Which to me makes sense as time and space is created (The Big Bang) wouldn't it be created on the quantum level? Couldnt this still be going on in the...

(High Tide) (Ebb Tide) or tide force and magnetic force , both related or not help me please ! Thank ...

Homework Statement Given: Bit rate = C = 9600 bits/second Channel Bandwidth = B = 10 MHz Find Tx for satellite side and ground side Homework Equations Shannon's equation: C = B*log {1+(S/N)} (log is to the base 2) The Attempt at a Solution Well this is how I decided to approach the...

I have been working on a dynamometer project for radio controlled cars. You can see my early (and somewhat crude) attempts here: http://www.youtube.com/watch?v=qEhnFd8bwqM" A question has come up in some of the discussions I have had with other enthusiasts. Given the diameter of the rollers...

Homework Statement Anyone know any website or link or pdf or ebook which has questions to math topics and offers explanations to them? The book I am currently using has questions but no explanation or answers to the problems and this makes my understanding of topics quite tedious. Is there any...

What is the common origin of the terms: (1) "moment" as in "moment of interia" (2) "moment" as in the math terms first moment, second moment, etc. (3) "momentum"? The first two are somewhat easy to see, though I'd like see someone familiar with it spell it out. But I've always wondered...

Is there a link between Faith and fine writing? I'm an agnostic, and I find it difficult to believe that there's a link. However, the following article claims that there's one: The quality of English writing has declined, a new book claims, in tandem with a decline in widespread public...

The magnetic field Bw is measured at a distance b from the centre of a long thin wire. The magnetic field Bc is also measure inside the capacitor plates at a distance b from the axis of the capacitor, where b is less than the radius "a" of the plates. using Maxwell's equations, show that...

Hello, I have set-up a spreadsheet to analyze the loads in suspension members for a double wishbone suspension with a push-rod. It solves simulataneous equations generated by summing forces and taking moments. Would someone mind talking a look at the spreadsheet with the aim of checking it's...

First, the assembly, time lapsed of course... http://www.youtube.com/watch?v=kVrUR_SOykk&feature=related" This is a blow up of the Transition Radiation, Semi-conductor and Pixel Detectors, innermost Atlas detectors. Description of layers of detectors and what each one is...