Beam Definition and 1000 Threads

I am trying to come up with a design for a device with which to generate a rapidly pulsed proton beam (on the order of 1 pulse per ms). My thought was to apply a 10 kV potential between two parallel plates (each with a hole in their center) and inject a steady stream of hydrogen gas through the...

Suppose there exists a proton beam that is pulsed on and off. If this beam is aimed through a current transformer as in the attached image (the proton beam would act as the main primary conductor in this case), what would be the output of the transformer, and how would it affect the beam...

Hi there, I'm trying to design an ion beam source, but having some issues with the thermodynamics of it. I'm no expert in thermodynamics, but I do understand some. I'm trying to find an equation which I can use to find the amount of energy I need to put into a set mass of a set material in order...

I tried to use F/S = E.ε to find the new length after deformation and than use pytagoras theorem in right angled triangle to find how much did the middle point lower. But it was said to me that my method is wrong and that there exists some formula to solve it. Can you please tell me where could...

Hi Guys, I want to determine the safe work load (SWL) capacity of a trestle in my workshop. It is a T Beam with width (W), height (h), thickness (t) and length (L). It is welded each end to two legs - what kind of support would this be considered as? Fixed or pin? Can someone walk me through...

Hi all I am working on beam forming of high frequency (>400 KHz) linear array for imaging sonar. I have gathered sensor data of 80 channel linear array sub merged halfway in 8 m deep water tank with a transmitting probe 6 m away from it at same depth. I recorded multiple pulses and perform...

Thanks for being here, this is my first post. Imagine on a dark night a very powerful beam of light was aimed at the sun from earth and switched on, at 23:00. I am observing from side on, in space, at a distance far enough away to get a good view of the beam as it travels out into space on its...

Hello, I have some trouble understanding how to construct the matrix for the beam splitter (in a Mach-Zehnder interferometer). I started with deciding my input and output states for the photon. I then use Borns rule, which I have attached below: To get the following for the state space...

Hi, it may look like a homework but believe me that it's not. Castigliano's method was omitted when I was attending mechanics of materials course at my university and now I'm catching up. Another reason why I want to solve this is that I'm just curious what's the formula for the deflection of...

I've been refreshing my mind with regards to solving statically indeterminate beam deflection problems. In an effort to achieve confidence over my solutions, I attempted to recreate the standard equations in Figure 1. In my problem, I changed it so that: a = b = L/2 Ay = R1 By = R2 etc...

1. The illustrated structure is affected by a known couple, and try to figure out the restraining reaction force of the hinge A and hinge E. We should analyse ECD instead. Since arm CD is a two force members, so N(C) in in the direction where CD connects by these two points. The distance from...

Homework Statement a beam is 10 m long with point loads of 10kN at 3m from left and 20kN 10m from left. R1 and R2 these supports are 2m in from either end of the beam. The beam has a UDL of 5kN/m-1 along its length. Homework Equations (a) determine the vertical reaction at the support(b)...

Hi, If I have a straight beam and I start to push its ends towards each other with force F, the beam will obviously bend into an arc. What is the height/amplitude at the center of the arc when the beam length is l and the beam ends have been displaced by d. How much force (P) the center part...

I am working off the estimation that a simple beam of width w will be roughly half the strength of a beam of width 2w. (linear relationship, unlike beam depth). I am wondering if the cohesion of that beam matters tremendously (at practical scales), or if its width can be considered in a...

In the formulation of Euler-Bernoulli Beam Theory, there are two degrees of freedom at a point, w and dw/dx. Typically, the finite element model of this theory uses cubic polynomial for interpolation of $w$ using a two noded element as given in Chapter 5 of this book [1]. This element is a...

Homework Statement Show that the neutron density distribution function at any point in a monodirectional beam of monoenergetic neutrons moving along the x-axis is given by $$n(x, \mathbf \omega) = \frac n {\pi} \delta( \mu -1)$$ where ##n## is the neutron density, ##\delta( \mu -1)## is the...

Hey there! I am working on a project concerning the mathematical modeling of nano-swimmers in a viscous medium. Assuming the nano-swimmers to be cantilever beams, the project involves calculation of moment of inertia of the said nano-swimmers. While calculating the moment of inertia of a simple...

I have a W24 X 94 beam (50KSI) that is loaded with a 3,500,000 in-lb moment load at each end. How do i calculate the maximum length of the beam that can support the moment loads?

The scenario is: we have a simply supported beam, with the supports being an arbitrary distance inward from the outer edge of the beam (both are the same distance from their edges such that the beam is symmetrical about its centre). The beam also experiences uniform loading across the entirety...

Homework Statement I have beam supported in three points (one of the support is spring) . What i know: PR = 100kN/m spring constant Z = 10kN/m I have to calculate bending moments and shear forces in points A, B and Z. Homework Equations [/B] ΣM = 0 ΣF = 0 Spring force : Fz=-zx This is not...

Hello, everyone.I have been trying to understand the meaning of the question from the posted image.I think that preloading has to do with adding bolts to the cantilever beam such that it can withstand the force from above, but I am not sure how exactly these bolts should be implemented.I would...

It's come to my attention that if we were to travel in a spaceship at 0.5c directly away from our sun, I would observe that the light from the sun as being red shifted. What I would also observe was that this red shifted electromagnetic wave would in fact travel away from me in the spaceship...

Hi all. Please see image I created as reference to this question.I have a uniform rod which is fixed to a structure, at the end of the rod there is a point mass attached to it. I am trying to calculate the downward force (torque) made at the end of the rod where the mass resides. I want to know...

So I'm going to try to keep this as brief as possible, but I have a somewhat advanced physics question that my nuclear background hasn't prepared me for and I need an argument settled at work. Say you have a 30 ft deep pool and you need to protect the contents, which comprise the bottom ~10 ft...

Suppose some protons are impacted on a Lithium target to produce neutrons with energies close to the proton energy. If one considers Energy-loss due to proton-target collision (ionization of the target atoms), will this kind of energy loss influence neutron energy spectrum? I am asked by my...

Homework Statement A laser tweezer is a laboratory instrument, which uses highly focused laser beams to ‘trap’, hold or move small sized objects. The principle of the operation is that in the focal spot, the light intensity is inhomogeneous, and acts on the particle with a force that points...

When 2 identical photons are incident at the same time at the input channels of a 50:50 beam splitter, quantum interference causes the elimination of the both reflected and both transmitted outcomes ##\hat{a}_{1H}^{\dagger}\hat{a}_{2H}^{\dagger}|0\rangle_1|0\rangle_2 \ne...

Hi, My question is: If a constant load is applied at the free end of a perfectly elastic cantilever beam, would the beam oscillate about a mean position? Or would it eventually come to rest at the equilibrium position? There are no damping effects. Thank you.

Hi, Im trying to find the method for working out the support reaction loads on a beam at given angle. example: a 6m beam with a point load 600kg or UDl of 100kg/m perpendicular to the beam. Suspended at each end by a chain hoist, "a" and "b". "b" is 2m higher than "a". I believe using angle is...

Hi! I have a question related to boundary condition in a one dimensional beam subject to compression and traction efforts. In my class notes I have the following: If we consider a 1D beam of length L which is fixed at x=0 and subject to an effort F at x=0 we have the following boundary...

I'm interested in understanding how to deal with a torque applied to an angled cantilever beam. The torque is being applied along a horizontal axis at the location of the end of a cylindrical beam. I am interested in how this torque will cause twist along the beam's axis, as well as any...

Hello I am new to this forum. I need to lift a part with the use of a motor and was looking for some advise in selecting a suitable one. The part being lifted weighs 275kg and is being lifted using lugs at one end of the part. The part is a total length of 2291mm and the location for holes in...

is it possible, i mean can we hold it at a certain distance we want ?

What are the advantages or purpose of restrained steel beam compared to restrained steel beam ?

I have tried to searched for functions online and apply it, but still it does not work well. May I ask how can I solve symbolic simultaneous equations with Matlab? Or is there anything went wrong with my program? Homework Statement Consider a stepped beam shown in below. The beam is...

Homework Statement Homework Equations Singularity equations for beam deflection $$\sum M_B=0=-M_0-R_AL-M_0$$ $$R_A=-\frac{2M_0}{L}$$ The Attempt at a Solution I know how to use singularity equations and all that but my problem is calculating the force especially when moment is involved. For...

Homework Statement i) Determine the slope of the beam 1m from the wall. ii) Calculate the deflection at the free end of the beam. Homework Equations Macauly's method of deflection: M = -RX + W[X-a] Integrate once for slope Integrate twice for deflection The Attempt at a Solution [/B] It...

Homework Statement Guys, I was told that the ground beam can't cat together with ground slab ? Why ? Why for first floor , the beam can be casted together with ground slab ? Homework EquationsThe Attempt at a Solution I think the ground beam can be casted together with ground slab ... Am i...

Hello, i would like to ask You a question about difference in results between Euler-Bernoulli method of analysis of stress in short slender beam and 3D FEA method mentioned in ansys aim tutorial here: https://confluence.cornell.edu/pages/viewpage.action?pageId=33636829 The problem looks like...

Imagine a steel I-girder lifted by a single wire rope. If the rope is not perfectly centered along the girder length, the girder will rotate about a horizontal latitudinal axis through its centroid. Imagine a girder pair lifted by two wire ropes, with one rope on each side of the girder...

When Cern is done with a particle beam, what fraction of a typical beam bunch is left having not scattered out of the bunch? Is it of order 1/2? A very rough estimate would do. Edit, I should add that I read an accelerated beam might be used for a day and at the end of the day they dispose of...

Homework Statement The duration of a laser pulse is 10^(-8) s. The uncertainty in its energy will be? Homework Equations ## \delta x \delta p=\frac{h}{2\pi}## The Attempt at a Solution speed of laser beam=c, duration is given so distance can be calculated exactly-shouldn't that mean delta...

I have two lasers with different intensity distributions (shown below) — one is Gaussian and the other one is rectangular (having the shape of a Fresnel diffraction pattern at the target). I am trying to compare the efficacy of the two lasers for burning a certain material (I am really...

The lower plate of a parallel plate capacitor is supported on a rigid rod.The upper plate is suspended from one end of a balance.The two plates are joined together by a thin wire and subsequently disconnected.The balance is then counterpoised.Now a voltage V= 5000V is applied between the...

If a beam of electrons starts to accelerate from rest due to a uniform electric field in vacuum will the electrons feel any mutual repulsion or attraction? Will the beam first expand then contract? If yes, how does this happen? This was a question under magnetism head.

Please help me in understanding the function of anode. As in image attached you see, once the electron beam is emitted from cathode and filtered by grid, it enters into the one or series of anodes. As anode is positively charged, so, to my understanding it has no electric field inside its hollow...

Hi .. for a simple beam with uniformly distributed load and moment formula of w * ln /8 at center.. is it independent of thickness of the beam such that even if a beam is 1 meter depth by half meter width compare to beam half or even twice its size..the formula and moment is still the one for a...

Hello, I am looking for some advice on calculating the beam deflection on a setup described below. There is an "I Beam" sitting across the back of two lorry trailers with a uniformly distributed load in the middle of the beam. I am slightly confused as to what type of support this would be if...

For a beam above between two columns and bars are yield and hinging.. the formula to get the probable shear or vpr (from statics) is V= M(+) + M(-) /ln I guess it is derived from V * ln = M(+) + M(-) First of all. Why is the shear only present when it is hinging and not before (I'm talking...

<<moderator note, moved from a homework forum, hence the template.>> 1. Homework Statement I'm trying to work out what 2.29 is in an equation an engineer has used for what i believe is supposed to be the second moment of area. See photo for report. Homework Equations See screenshot photo...