Mechanism Definition and 511 Threads

Hello, I have read that `cosmological redshift` means a photon is being `stretched`by space dilation and thus gets to have `longer wavelength` I am unsure if this is true and if yes, why is it true Many thanks

Hi, I've been searching for the oxidation mechanism of KMnO4 on alkanes (aryl derivatives like toluene). All I found was some web sites telling me the overall reaction and that the mechanism is either unimportant or too complicated for their purposes. I found some little notes that it has a...

what is "q" (the charge) in higgs mechanism? hi, does anybody know what kind of charge the "q" stand for in the higgs mechanism? I mean the mechanism between the weak force mediators: W & Z, and the higgs boson, which leads to them acquiring mass. I've learned about it from the...

Theorem unifies superfluids and other weird materials http://newscenter.berkeley.edu/2012/06/08/theorem-unifies-superfluids-and-other-weird-materials/ Nambu Goldstone bosons...of the Higgs Mechanism!..and phonons...from Cosmology to materials design. “Surprisingly, the implications of...

Hi, As I understand, please correct me if I'm wrong, when a subatomic particle interacts with the Higgs field it generates mass due to the higgs mechanism. Does this have anything to do with with e = mc2? (I'm not too privy to particle physics or relativity.) Suppose an electron and a...

The Higgs mechanism is often explained (both here at PF and in many physics sites including wikipedia) as an example of spontaneous symmetry breaking, but the Nobel winner physicist 't Hooft says in his "for laymen" book about particle physics, "In search of the ultimate building blocks", that...

The Higgs mechanism and the Beginning of the Universe Now that the excitement about the discovery of the Higgs particle has made the Higgs mechanism justly famous, could someone please clarify for me the implications of incorporating this component of the Standard Model of Particle Physics...

My prof. asked: "What is the mechanism that causes certain materials to exhibit superconductivity at temperatures much higher than around 25 kelvin?" then until now it remain a question to me?.. so anyone have an idea? thank you.

ion accelerating source setup I'm currently building a rectified, filtered power supply for use as an ion accelerator. The setup is attached as a JPEG. I am wondering how/where I can add resistors to the arrangement to make it so that when the dielectric breakdown voltage is between the...

Hey! I'm trying to find a more cost efficient alternative to a spring for a design that I'm working on. Basically, I'm designing a tile that you step on and drops about an inch and then comes back up when you step off. I have been researching and trying to find springs to use, but my cost is...

I understand that an electron gets its mass by self-interaction of its fields which is explained by QED, but on the other hand there is the higgs mechanism which gives mass to all the fundamental particles. Does the electron have two types of mass one which is due to the QED mechanism and the...

I am led to believe that while the Higgs Mechanism is now almost certainly the explanation for mass, it gives no insight whatsoever into gravity. I really really hope that I am incorrect. There's got to be some speculation out there. What do the boson and the field have to do with gravity...

After having read a number of articles about the potential discovery of the Higgs boson at CERN, I am wondering how the "mass effect" generation by the Higgs mechanism can coexist with gravitation as gravitation has been since Newton tightly coupled with the concept of mass. I develop below...

Hey basically I'm trying to find a light and small mechanism that is able to clamp up/fasten two board/plank together in a simple way without the use of screws. I'm trying to connect an acrylic board with the right suitable size on the base of the design. Do anyone have a thought on this? I have...

Hey guys, I'm brainstorming some ideas for a mechanism that will be able to move an object in the vertical plane up and down, as well as left to right. Essentially I'm looking at controlling the X and Y coordinates of this moving mass. I want to be able to move in the vertical plane, lock it...

As I was taught in my modern physics class the Higg's Field acts like an ideal ferromagnet cooling down to some constant and thus invoking spontaneous symmetry breaking. The process of the Higg's Field cooling down is modeled by the Mexican Hat Potential. What I do not understand about the...

I'm using arduino to make a water sensor. The sensor needs to go off after a certain period of time of not having come into contact with any water. The difficulty is that i can't use a delay() mechanism as it would mess with other functions of the sensor. I had thought i found a solution but i...

I have to conduct wind tunnel test on a naca0015 symmetric airfoil at different angles of attack and I am in search of a suitable mechanism to change the angle of attack of the airfoil.Please help.

I start Organic II in the fall. I'm looking for a place that has O Chem I and II reaction mechanisms with arrow pushing shown. Yes, I'm lazy and don't want to make more note cards. I apologize if I was unable to find it with the search function.

Dear all! I have encountered a problem with modelling a truss. When modelling on an analysis software, you must release the ends of the joints, but not all or it will form a mechanism, therefore you release all but one of the joint. But what I have here, is a truss that is released on all ends...

Homework Statement In a high school project we have been given the assignment to design the mechanism to transform the a rotary motion into the oscillating of a wiper blade. I'm a bit confused as to how to go about the problem.. I have been given that there is a closing force between the...

I have this reaction mechanism but I am not sure if its correct or not. In lab we reduced the m-nitroacetophenone using tin and HCl and then using sodium hydroxide to make m-aminoacetophenone. This mechanism goes beyond the scope of our class and not sure why our lab teacher had us do it and its...

When scientists analyze proteins (chains of amino acids), often times light spectroscopy is used. Light is passes through a cuvet containing dissolved protein, and the absorption is measured. My question is: How do bonds absorb energy? What is the actual mechanism? I have been told that the...

I'm looking to do a fluid flow analysis on the recoil mechanism of a howitzer. The analysis will involve simulating oil flowing through some complex orifice profiles. There will be 2 fluids (oil & nitrogen) in different parts of the recoil mechanism. The results I would like from the...

It seems to me that it should be. For example, some systems do not have a well-defined temperature. How do you use laws of physics depending on temperature (such as the law of thermodynamics) when you have a system that doesn't have a well-defined temperature? How do you even go about discussing...

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...

Hi, I wonder what people think of the following mechanism for matter creation in an expanding Universe. Imagine a particle-antiparticle pair coming into existence from the vacuum. As I understand it, they will annihilate each other in the time that a light signal takes to travel from one...

I might misunderstand the higgs mechanism. And I have a puzzle. Consider an electron in an accelerater. It is massive at low energy and its speed is something lower than the speed of light. However when it is accelerated to the electroweak scale, su(2) becomes unbroken and the electron turns...

in mechanics and physics we are forever talking about friction and using it to solve problems. but what actually is friction? is it as simple as saying how rough a surface is? that doesn't sound adequate to me. if that were the case then i'd expect all materials to have the same...

Hi, I need to figure out how to design a device that should climb on a rope without any electrical or chemical plant (see the attached file for drawing). I need a good idea how to generate sufficient lifting force in order to compensate weight and friction?

Hi all, I'm a first time poster in Biology, and I'm not sure if this question belongs in Biology or Medicine. (I normally hang out over in quantum physics.) What is currently known about the detailed neurological/biological mechanism by which humans perceive the passage of time? Simple...

Homework Statement A string with mass density u = 9.00 g/m extends from zero to infinity along the x-axis. It is under tension T = 25 N, and is driven by a mechanism at x = 0. The velocity of the drive mechanism depends on time as: vy(t) = 0 (if t = 0) 10.0 cm/s (if 0 < t ≤ 0.1 s)...

So we need to make a gripper in Solidworks only for this object http://img819.imageshack.us/img819/2285/thepart.jpg Our current goal (as per our professor) is to focus on our gripper mechanism. My classmate suggested the following for the gripper final grip mechanism...

Hello, I can understand only the basic principle behind quantum entanglement. Do you guys know of the mechanism by which it works? I understand that there is no information being transferred between particles that react under entanglement. So what then is the hypotheses as to how one particle...

Hi, Can anyone help derive the rate law for the Eigen wilkins reaction mechanism? The derivation in the wikipedia entry (http://en.wikipedia.org/wiki/Eigen-Wilkins_Mechanism) is confusing, but the rate law is correct. I can't figure out if they make a "steady-state" approximation or a...

Hi, How about this for a sketch of the mechanism of Mach's principle? For the sake of argument let us assume that gravitational waves behave in an analogous way to electromagnetic waves. Let us also assume that the masses in the rest of the Universe are rigidly fixed. I apply a force to...

Hey, I just started a course in mechanism design this semester and I was wondering if there was a free/inexpensive piece of software that would allow me to simulate/analyze simple mechanisms including linkages, joints, and such. Perhaps there might also be some sort of java applet on the web...

I have a need for a mechanism that acts juust like a spring (I pull, load it up, and when i let go it pulls away and returns to its normal length), but doesn't snap back like a spring. I have experiemented with automatic door closers, but they are definatly not the answer (require too much...

I'm watching a fascinating video about DNA replication: Can someone explain briefly what the mechanism of action (and locomotion) is for all these little machines? Is it simply electric potential (due to ionization?) ? Thanks

The problem: I was planning on using pneumatic linear actuators for a deflector - to direct the material from a conveyor, correctly down the chute - and i needed the deflector to be adjustable. The deflector itself is made out of chromium carbide clad plate, it will weigh atleast 100 kilos or...

Hi, Im currently designing a small machine which uses a simple crank mechanism but my crank mechanism is not a typical one. My application: [/URL] My application uses the crank wheel to drive the block (10kg). Hence, I need to calculate the torque require to drive the crank wheel. So I can...

hello guys..i'm trying to make my first rc car..but m not getting the steering mechanism for it..is the steering mechanism for real cars applicable on it..?:confused::mad::rolleyes:

How are cell membranes enlarged? What is known about how this process is controlled? How might I read more about this topic? I am mainly asking about animal cells.

Our universe apparently has a positive cosmological constant so it will look more and more like de Sitter spacetime, expanding at at exponentially increasing rate. So eventually it seems that subatomic spacetime would be affected by this. Eventually even something a Planck distance away would...

I've just viewed the National Geographic Channel's "Engineering Connections" program. specifically, the episode entitled "Airbus380", and that episode's discussion of the A380's landing gear shock absorbers, which used bicycle pumps filled with water to illustrate the basic principle of...

I think I understand the basics of the SM and know that the W and Z bosons are the mediators of the Weak Force. I also understand from chem the basics about nuclear stability (ratio of protons to neutrons, valley of stability/nuclear binding energy, etc.). What I'd like to know is what the...

i am confused about the railguns electro-magnetic action please somebody explain if possible.

What is the mechanism of pH scale?

what is the mechanism of small holes in auditorioms used as sound absorbers

A chemical Reaction A-->B is carried out in a closed vessel. The following data are taken for the concentration of A, Ca (g/L), as a function of time, t(min), from the start of the reaction. A proposed reaction mechanism predicts that Ca and t should be related by the expression ln...