Mechanism Definition and 534 Threads

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...

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?

Homework Statement Set the cars so the spring mechanism is touching a side if a cart without a spring mechanism. When you it the spring the carts should move in opposite directions. Based on the results, disregarding error, momentum is conserved. What are some everyday practical applications...

"Although the evidence for the Higgs mechanism is overwhelming," As far as I know there is no evidence for the Higgs mechanism. The only potential evidence is the Higgs particle which has not been found! Is this also SM propaganda?

"The Higgs mechanism in the standard model successfully predicts the mass of the W±, and Z weak gauge bosons," How does the higgs mechanism predict the masses of the W & Z? The Higgs has no specific coupling value to any particle and it is the coupling value that gives the mass value Is...

Homework Statement "Given the rate law for the following equation is Rate = k[A][B2] 2A + B2 ------> 2AB Suggest a mechanism for the reaction Homework Equations I have no clue; I was absent for 2 weeks and now have to teach myself the first two units, I've been...

I need to study about the variable pitch propeller and its mechanism of adjusting the angel of the blades. And also about the materials used to make propellers and their benefits.. can someone please help me to find sources such as images/videos about the variable pitch propeller? or...

hi , I want to ask a question ... . What is the mechanism of this rxn ? CH3CH2OH +MNO2 -------> CH3COOH I want to help you to find out the mechanism quickly , please

Hi, I'm building an battle robot. The total weight of the bot is round 40KG. I want to implement an steering mechanism for my bot. For that i found Rack and pinion arrangement. But the problem in that is, how to make an DC motor to rotate just for a few revolutions? Another method which can...

Hi, I am a hobbiest and I am trying to build a weight sorting machine that sorts out weight object according to their weight. So, basically, there are carriers that are used for transporting weight object and I attached a guilde piston mechanism underneath the carrier so that the carrier could...

Attached is a drawing of my Proposed mechanism. Am I right to say the period of the waves could be determined by changing the length of the Rod? Any comments on the design?

(different guy using the same user name) I am looking for a simple engineering software to model crank and rocker, gear, crank and slider, worm gear, scotch yoke, cam and other generic mechanisms. Most important is crank and rocker. Maybe some hydraulics and pneumatics. Something my...

Hi, I'm currently looking into reflectivity and emissivity of metals in sunlight. However, I can't quite grasp how the mechanisms of reflection and emission differ. Emission obviously occurs because an electron is exited by a photon and then is de-excited and emits photon or photons. However...

Hi everyone! Can somebody briefly explain me what the GIM Mechanism (Glashow, Iliopoulos, and Maiani) is and why does it not allow FCNC transitions at tree level. Thanks in advance!

I've been fascinated by the idea of using a nuclear reactor (either pebble-bed or particle-bed)as a powerplant for an aerospace vehicle, but of course there is the problem of coupling the thermal energy to the propellant flow by direct contact without having bits of radioactive debris from the...

how does the exchange coupling mechanism work that produce the ferromagnetic properties of materials?

Well, if we say that evolution is some gradual change of an organism from some form S to S* over a period of time. should there be some mechanism already in place to even allow evolution to occur? To be even more clear. For organism of form S, and successive generations S* , S**...

Starting out with TiCl4 and triethylaluminum, I understand how the triethylaluminum alkylates the TiCl4 and creates a polymeric TiCl3, but then an ethene molecule coordinates with a vacant site on the alkylated TiCl3? I thought titanium's highest oxidation state was +4?

Hello there, I am in no way shape or form a scientist/engineer. (I am making a prop for a film) I am filming a xylophone and need a very smooth movement of the stick/drum stick hitting the xylophone plate. (The movement has to be quite small from 10cms between each point, up and down) I came...

It is well established that the cosmological redshift causes both the wavelength and the separation of photons to increase in proportion with the increase in the cosmic scale factor a. The traditional explanation for the mechanism of the redshift is that ‘expanding space’ progressively forces...

I have a .380 auto handgun which uses a #8-32 NC cap-head screw to retain the trigger guard. During firing, the mechanical shock of the cycling action serves to rapidly loosen this screw regardless of the torque used to tighten it down. I cannot use a standard star washer because they're...

Classify Cam-Follower pair in Cam-follower mechanism as...?? Hi guys... Just want to hear your views on the following case,I haven't reached any conclusion as of now... I think its better if mny ppl contribute their views abt this.. Here is the question:[Deals with Theory of Machines]...

hey...I have to develop a suction mechanism for sucking air from a 20 meter high stack to the ground level and at 20lpm outlet flow rate. I don't know the difference between using a suction fan or a pump and which of the 2 would be better .also how to account for all the losses that will be...

1. For the reaction 2NO + Cl2 --> 2NOCl Match the appropriate rate law to each postulated mechanism. A Rate = k[NO]2[Cl2]2 B Rate = k[NO][Cl2] C Rate = k[NO][Cl2]2 D Rate = k[Cl2] E Rate = k[Cl2]2 F Rate = k[NO] G Rate = k[NO]2[Cl2] H Rate = k[NO]2 I None of the...

Homework Statement Need to prove that a slider crank mechanism fits the Grueblers eqaution, already done for a four bar mechanism no problem, however having some serious problems with the slider crank. If l is the number of links and j is the number of joints Homework Equations Grueblers...

What is the mechanism by which they adhere to each other, and what stops them from sticking together when say you put your hands together?

I need help understanding the Higgs mechanism: what is the Higgs condensate, what is the Higgs boson, why do only the W and Z bosons have mass, and how exactly do particles receive mass? thanks guys!

Homework Statement I am given isobutane as my starting material, Br2 and benzoyl peroxide as my radical initiators. My final product is the isobutane with Br attached instead of H. I have to design the mechanism. I have tried what seems like an endless combination of mechanism attempts...

Hello again! I have a question regarding the reaction of C6H5NH3 with NaOH to make C6H5NH2. How would a mechanism be written to describe this process? I know that C6H5NH3 goes from having a positive charge on the nitrogen and after it reacts with NaOH, C6H5NH2 has a neutral charge but not sure...

OIOIC is a completely new object-oriented mechanism for the C programming language. Using OIOIC, you can describe the flower, birds, grass, insects, trees, houses ... Using OIOIC, you can describe the elements, atoms, protons, electrons ... Using OIOIC, you can describe the earth, the...

Hey all, Our team is currently working on a project which contains the pullback mechanism like the ones you find in toys. We are competing against other teams and have a fun match at the end. The idea is to pull or push the vehicle back 1 meter and store as much as possible energy. We only have...

Hey guys. Can someone show me the mechanism for Aspartame to methanol?

Homework Statement What mechanism is responsible for the sequencing of amino acids? Homework Equations The Attempt at a Solution I don't quite understand, is it asking what is the procedure called that causes sequencing of amino acids?

Hello, I'm an electrical engineering student at Washington State University, and I am attempting to design a beer pong (more properly known as beirut) playing robot. It won't be completely autonomous, as you will still have to tell it when to shoot, and load the balls, etc. Anyway, all of the...

Homework Statement guys i have this past paper question "describe with the aid of a circuit diagram of twin fluorescent unit to be used in a workshop where rotating machines are widely used" can someone help me with this? i search google but couldn't even find about twin fluorescent...

Homework Statement Write a detailed mechanism for the following reaction: Attached picture Homework Equations N/A The Attempt at a Solution Okay, I know this is PART of the mechanism for the oxidation of a glycol by periodic acid which causes cleavage of the C-C bond between the...

I want to build a porter governor to control the speed of a shaft via a varible dia double cone pulley. The speed range to be considered is b/w 250-750 rpm. I would like to know the equations involved. My textbook provides theoretical equations, I would be obliged if I could get the actual...