Mechanism Definition and 511 Threads

Knife edges on the edges of flanges with a maleable material gasket like copper is often used for creating UHV chamber environments. For UHV view ports, typically say quartz or some other material, how is the UHV seal accomplished? Is it the same mechanism? E.g. knife edges machined on...

Hi everyone, I hope I have posted in the right place. I'm a commerce student and have absolutely no idea about mechanical stuffs. My father has an idea in mind which he would love to implement. He too is a commerce student. Hence, I need some help from you'll to see if this is really practical...

I'm developing an automatic spray-paint shaking machine in order to achieve very well mixed paint for a big project. Since I'm using stone textured paint with lots of fibers and "Stuff" floating around in it, I'd like to go above and beyond in the shaking. Simply put, I want to roughly...

Electricity affect neurons. For example, in 1791 Galvani made the legs of a dead frog twitch by exposing them to a spark, and more recently in history, electric currents through the brain has been used to deliberately induce "therapeutic" epileptic seizures. What I wonder about is the exact...

Not a homework question, but here seems the most revelant place for this kind of maths. I have a problem similar to a slider crank but not quite. http://imageshack.us/photo/my-images/851/sw1b.png/ Fixed points are A and B, all others are free to pivot. The beam labeled 20 is rotating...

Ok, I have a problem similar to a slider crank but not quite. http://imageshack.us/photo/my-images/851/sw1b.png/ Fixed points are A and B, all others are free to pivot. The beam labeled 20 is rotating around, at this snapshot 40 degrees from vertical. How can I find how many degrees back...

The theorized Alcubierre engine is purported to be capable of transporting a ship faster than the speed of light. I'm aware of the theory's problems associated with how much energy would be required to operate such an engine. This isn't my question. Apparently gravity waves, waves in the...

First, let me point out that this is probably wrong. Anytime I hear faster than light travel I am automatically skeptical. I just haven’t figured out why it’s wrong yet. Any ideas? 1. Two devices situated in between Bob and Alice produce two streams of entangled pairs of qubits. Each pair...

I am working on a concept for an overspeed trip mechanism. I'm almost done with this except for this one thing: i need a locking mechanism that will hold a dead weight at a height so that this weight is only released only when the lock is actuated to realease it. But that's not all. When...

I have read this in many places that carbon or any fuel for that matter example methane when undergoes combustion in limited supply of oxygen forms carbon monoxide as a major product. Could anyone explain me why this happens? I mean why can't the carbon atoms simply react with the required...

Homework Statement I'm trying to figure out the mechanism for a reaction catalyzed by MacMillan Generation 1 and 2 organocatalysts. Not going so well. I don't understand what role the organocatalyst plays in the reaction. I read a paper about MacMillan and I think it was saying that the...

Homework Statement http://img848.imageshack.us/img848/5884/screenshot20110425at121.png Uploaded with ImageShack.us Homework Equations Sum Horizontal forces = 0 Sum vertical forces = 0 Sum moments = 0 Sum Horizontal Forces=0 The Attempt at a Solution Dx-Ax+Bx+Cx=0 Dx-Ax+Bx+981 Sum Vertical...

I know you can make mechanisms using popular CAD softwares like Pro/ENGINEER but these packages are a bit too tough to learn and master. I wanted to know the names of any packages that are solely designed for mechanisms where you can design and run a mechanism easily without having to learn the...

what is Mechanism of DNA double from 1N to 2N ?

Hi all :) I have a physics project where we make a mousetrap car. Can someone explain to me what is the mechanism behind it and the advantages of using a mouse trap powered car? Thank you

http://arxiv.org/abs/1101.4298 The missing link: Merging neutron stars naturally produce jet-like structures and can power short Gamma-Ray Bursts Luciano Rezzolla, Bruno Giacomazzo, Luca Baiotti, Jonathan Granot, Chryssa Kouveliotou, Miguel A. Aloy (Submitted on 22 Jan 2011) "Short Gamma-Ray...

http://sbtvd.anadigi.zip.net/images/camara.JPG http://sbtvd.anadigi.zip.net/images/camara2.JPG A student walks into a room with a groove on the ceiling. Turning off the lights, he sees a shadow moving the floor. With only a ruler and a stopwatch, the student is able to determine what type of...

How does a the propulsion mechanism of a ferris wheel propel the ride? A diagram would be helpful

I understand how non-euclidean space curvature can cause a change in direction of inertial motion but I don't understand how it can cause acceleration. I guess the reason will be that not only space is curved but also time and that the time curvature somehow will provide the energy needed...

Homework Statement Ammonia decomposes to form nitrogen gas and hydrogen gas. The rate law for the reaction is Rate=k[NH3]/. Devise a plausible mechanism for this reaction, taking into account both the balanced equation and the rate law. Homework Equations Rate = k[NH3]/[H2] 2NH3->N2 +...

I need help solving a mass moment of inertia for a slider crank mechanism. I've done my best to sketch it in the attachment. This will be used for sizing of a motor. Homework Statement Link A has mass Ma and is located Acg distance from its pivot point Z Link B has mass Mb and is located Bcg...

I am working on a rope system with pulleys as you see in the picture. The diameter of the rope is about 1-2 mm. I am looking for a stretching mechanism for this system. Do you know any accessories that i can use here for this purpose? Note: Rope is made of stainless steel and the...

In what sense does the GIM mechanism implies the existence of a c quark? It seems that all that is required for Z0 suppression is to postulate that the mixed strange must be orthogonal to the mixed down quark.

Hi guys, Are there any free mechanism design software's. I want to test whether a mechanism would a given work or not. It's preferably a 4 bar mechanism. Also can you suggest any good books for theory of mechanism design? Thank you in Advance.

[PLAIN]http://img443.imageshack.us/img443/6488/mechanisma1.png The magnesium transfers an electron to the C-X bond, yielding a Mg radical. The halogen atom leaves with 2 electrons from the bond and the carbon is converted into a radical. The negatively charged bromide ion forms an ionic bond...

I was interested in knowing if my thoughts on this are right or if anyone else has any other thoughts on the reaction of any amino acid and concentrated HCl solution with water as the solvent; As an example of an amino acid such as cystine with an NH2 bonded to a carbon; I was thinking that...

"Transmission lines are specialized cables and other media designed to carry alternating current and electromagnetic waves of high frequency (radio frequency or higher), high enough that its wave nature must be taken into account. Transmission lines are used for purposes such as connecting...

what are the correct steps for the mechanism of chymotrypsin? Below is my answer but I don't know if it is right. a) His 57 catalyzes removal of H from Ser 195 hydroxyl. b. Ser 195's nucleophilic O attacks carbonyl C of substrate. c. His 57 donates H to N of sissile peptide bond...

I was assigned to design an existing product with reciprocator mechanism as shown below http://lh4.ggpht.com/_XzKHrOQkiyQ/SY8wIyYdKwI/AAAAAAAAAFM/uDbgweKFEX8/AutoCAD_2010_Reciprocator%5B5%5D.gif?imgmax=800 But i totally have no idea on it..Can someone please give me some advise?

mechanism for compensatory RESPIRATORY acidosis caused by metabolic alkalosis? I don't get it... someone please explain :(

Hello all! I am reading through a combustion text and I am a little flustered by this notation: Am I correct in saying that the "coefficient matrices" {{\nu'_{ji}}} and {{\nu''_{ji}}} are not really "proper" matrices in the sense that there is not a vector that can multiply them that...

Hi All, I'm working on a design of a seat for a simulator, the seat should include the motion mechanisms like the one in a car which Includes the slider, recliner, and the mechanism responsible for the vertical motion of the seat. So my question is I want to buy these mechanisms and...

I am in an organic chemistry lab course and my lecture and lab do not align nicely. I need to write out the full mechanism for the reaction of malachite green and crystal violet dyes. The reaction starts by preparing a Grignard reagent from 4-bromo-N,N-dimethylaniline with magnesium/thf. The...

What are the mechanism implications of MECO? I have been reviewing observational anomalies associated with quasars and spiral galaxy morophology/evolution and thinking about the MECO hypothesis and its implications. I would be interested in eventually discussing them as a set however I am...

Can Anyone explain how the existence of more than one generation of quark means that flavour change neutral currents do not occour at tree level? How is a flavour changing neutral current deffined anyway? I understand that it has something to do with Cabbibo suppression

I have a disagreement to resolve about diarrhea as a result of a food irritation or allergy (as opposed to flu or other) a short time (less than a couple of hours) after ingestion. 1] The food is basically liquified and passes out as diarrhrea. The food eaten is expelled as liquid within...

I have a reclining mechanism which moves by and down. It is X framed, just like an ambulance stretcher. It has to be able to raise its own weight through a vertical distance of 610mm. The length of the stretcher is 2m, and the distance between the wheels is fixed at 1.2m. Can anyone help me go...

Write the rate law for the following proposed mechanism for the decomposition of IBr to I2 and Br2. IBr(g)---------->I(g) + Br(g) (fast) IBr(g) + Br(g)-------->I(g) + Br2(g) (slow) I(g) + I(g)--------->I2(g) (fast) The answer is R=k[IBr]^2. I don't know where this answer comes...

I am trying to derive the mechanism of a charging capacitor , V=Vo(1-e^(-t/CR)) sorry , i couldn't upload the diagram here so i will briefly describe it , its a circuit with a battery (Vo) , connected to a capacitor (Vc) , and resistor (VR) and also a switch , all in series . i started...

I was little confused about taking inertial forces into significance while calculating piston effort in a piston crank slider arrangement. I read an analysis of various forces acting in a piston cylinder arrangement in a book yersterday, and while calculating piston effort(net force on piston...

I'd like to share with you some current thoughts that i had. Say we are 1-Dimensional. Our "eye" is at the O point, and there is an atom on some distance 'x' from our eye. The atom emits a photon, which comes into our eye and we detect it - we see a flash. Can we have any clue about the...

Homework Statement 1. According to the mechanism below, what is the correct expression for the rate of consumption of A? In the mechanism, M is a molecule that collides with A and A* is a highly-energized form of A. Step 1 (reversible): A + M <---> A* + M rate constants k1 and k-1 Step...

Hello, This is my first time here. Great site! I've searched for a while but didn't find anything. Is there cheap or free software I can download to design 4-bar or whatever linkage mechanisms like in http://www.youtube.com/watch?v=M-tHXsWioR4"? Thanks, B

We have been doing research on the differential expression of one gene between two cell lines (A and B cell lines), with high expression in A cell line and no expression in B cell line. We found that ~250 bp in the promoter of the gene has its activity in A cell line, but no activity in B cell...

heyy...i'm designing a crank for a mechanism...and i need to counterweight it...is there any formula which tells u how much counterweight to add...its a low speed mechanism and very light...material mostly plastic or wood

Hi, I was just wondering what kind of mechanism is used in this video It converts the up and down movement into rotational movement, and it all seems very compact and smooth. James

With advances in medicinesin 1800s and now the avg life expectancy being higher than reproductive age what could be driving human evolution? something like : Hundreds of Human Genes Still Evolving http://www.livescience.com/health/060308_human_evolve.html I understand genes could change...

In papers presented this week to the American Astronomical Society, Andrea Schmidt and John Singleton of Los Alamos National Laboratory provide detailed analyses of several pieces of observational data that suggest that pulsars emit the electromagnetic equivalent of the well-known "sonic boom"...

Hi, I am trying to make a conveyor that has a roller expension mechanism. Please take a look at this drawing. http://www.flickr.com/photos/46279408@N06/4251882419/sizes/o/ As the drawing shows, you can imagin two supporting beam on each side of rollers as rollers will need to be fixed or...

hi can anybody explain for me why some fans blow the air and some suck the air?.I know it depends on the form of its wing, but how?