Capture Definition and 148 Threads

My understanding of the FM capture effect is that if an FM receiver receives two, on frequency signals, it suppresses the weaker one and demodulates the stronger one, given that the difference in signal strength is significant enough. This differs from the case of AM where the two signals are...

Hello All I'm doing my theses in BNCT(Boron neutron capture therapy).I did it with 2.5 Mev imaginary accelerator. there are many reactors to compare my data with theirs.but Unfortunately I couldn't find some Real accelerators based on BNCT to compare my MCNP-X output data with theirs. could u...

I'm doing a research paper based on mining asteroids or near Earth objects. I was wondering, could we pull/move a relatively large asteroid About half as large as the moon could we use is as an anchor to launch missions? Thanks!

Hi, the wikipedia article on binary stars in the formation section claims that conservation of energy forbids a single object from capturing another. If this is true how so?

Can anyone help me with an approximate answer to this or point me in the direction of avenues to get an answer to this? This has practical applications and is potentially worrying. Roughly how much (or how many atoms) of cobalt-59 exposed to the average neutron radiation at in-flight...

Is it possible, in theory, that the physical entity electron e(-) and its charged opposite positron e(+) both obtained their respective electric charges by simultaneous capture, by a more fundamental quantum entity (call it FQE), of a quantum of photon with zero rest mass having equal amounts of...

I'm having some slight confusion over what seems to be a violation of conservation of mass: Both electrons and positrons have positive mass, so now consider an atom that undergoes a beta decay, and so has it's mass changed by the difference in mass between a proton and a neutron. How does it...

I have a need to capture some free sulfur and graphite molecules in the anodizing layer of aluminum, preferably a hard anodizing which uses higher current levels and lower temperature than normal anodizing. I had imagined puting DMSO for the sulfur molecule in the sulfuric anodizing solution and...

My research is about Design and modeling of beam tube of nuclear reactor for BNCT(Boron Neutron Capture Therapy) application and I need some journals and related books about it.

neutron capture --> gamma's Someone could explain me how neutron capture in Gadolinium happens? If a neutron is captured, an energy of about 8 Mev is released in form of gamma-ray cascade (Ʃγ). But... how many gammas are released? I believe the answer will be in form of probability...

Has anyone launched a high energy positron into a nucleus with no electrons that had a neutron such as Deuterium ---> Tritium, Can you force positron capture? has it happened before and if so what happened? Because I was thinking couldn't you do this with a highly vacuumed out supercollider...

Hi, I'm considering the following process n+p→d+\gamma where d is the deuteron and \gamma a photon. I want to find out the energy of the photon. I know it will be much less than the rest mass of the deuteron (1875.666 MeV/c2). Can I simply use conservation of energy here? i.e E\gamma...

Consider a three-tank system modeled by the equations: x_1' = -5x_1+5x_3 x_2' = 5x_1-2x_2 x_3' = 2x_2-5x_3 (A) Initially there are 10 pounds of grain in each tank. What will the amounts be as t \rightarrow \infty? (B) Solve the system and verify your conclusion from (A). I'm...

Hi I have an atom with nuclear charge Z, mass M and no electrons (a bare nucleus) which captures an electron into its ground state. I am asked to calculate the kinetic energy and the recoil speed of the nucleus after the electron capture... I have the Z^2 (-13,6 eV) as usual, as the...

I wish to verify a couple of assertions. From the NNDC and other references, it appears that the neutron capture cross section of 3H (Tritium) is zero to a first approximation. This holds true for all neutron energies, including cold neutrons. These statements are equivalent to asserting that 4H...

On a bipartite graph a game of cat vs mouse can be played, with say both the cat and mouse starting on a "red" vertex. We colour the vertices so that no two of the same colour are connected by an edge (can always be done with a bipartite graph of course). The game is played by cat and mouse...

Why do different nuclei need different neutron speed to achieve fission?? My understanding is that U-235 requires a thermal neutron in order to be likely to cause a fission reaction, however Pu-239 requires the additional energy of a fast neutron in order to cause the nucleus to undergo fission...

I am working on one project. In which I have CCD image sensor (Sony's ICX254AL ) and its output is connected to Analog Front End (TI's VSP2562). The output of Analog Front End (AFE) is 12 Bit Digital data at the rate of 9 MHz. I am thinking to use NI's PCIe 6535 as a data acquisition device to...

So my question has a few parts to it. First, if an atom is decaying and the proton (Z) number is decreasing in the decay process, am I correct in assuming that the nucleus is either decaying by electron capture of beta plus emission? Secondly, I understand that beta plus emission can only...

I suppose this question really has to do with how multiple sound waves can combine into one, while that new sound wave still sounds like a collection of all the sounds that made it up. But I'm really curious, how does a microphone accurately capture multiple sounds at once? Let's say a guitar...

What's the best way to capture the energy produced by a falling object, and then use that energy to produce electricity for example ? Like for instance, I've been thinking of a kind of water mill where it would be an object falling on the blades instead of water, therefore making the mill...

Homework Statement In a reactor, we're making 56Mn by inducing thermal neutron capture. 2g sample of 55Mn is put into the reactor which has a flux of thermal neutrons of 3E13 neutrons/cm^2*s Sample is in the reactor for 8 hours and then removed. a. Calculate the amount and activity of...

Homework Statement DT fusion produces 14.1 MeV neutrons. A diagnostic for a total fusion yield is the Cu-63( n, 2n)Cu-62 reaction. A) what is the threshold for this reaction? Cu-63 also undergoes a radiative capture reaction yielding Cu-64. This reaction has a thermal cross section of 4.5b...

Is it the same thing? If not what is the key difference between the two and what conditions would make the weak interactions governing the two more favourable than the other one?, (My thoughts are along the lines of , that proton-electron collision is referring to free electrons or free...

When electron capture and β+ decay occur in proton-rich nuclide, in order to obtain a lower E state, is the lower E state of the atom reached by 1 electron capture of the same energy as the state reached due to one β+ decay? - I ask because I know that in order for EC or B+ to occur, the...

I am not a condensed matter physicist. Can someone explain the situation for free electrons in a metal to me. It seems like they would head straight for the nearest positively charged lattice nuclei. As it got very close <3 fermi it would radiate a lot because it is accelerating. So after a few...

what is the differece between internal conversion electrons, electron capture and auger electons? i don't understand. The name suggests electron capture and internal conversion electrons are the same thing... but then when i look it up internal conversion electrons seem to be the same as auger...

If I have a low energy neutron and I bring it close to a nucleus it will be captured when it gets close enough. How can I calculate the shape of the potential well of the nucleus for neutron capture? I keep reading that it is due to the strong force, which I agree with. But it is some...

Hi, I have a program (it's HP printer manager software) that calls another program to send something to the printer. I found that program, but it can't run alone -- it says "device was not specified". I am positive there is just some kind of command-line argument missing, but there exists...

Homework Statement Consider a process of a capture of an electron into 2p1/2 and 2p3/2 states of hydrogen atom. Find a population ratio of these two states after the capture. Homework Equations ? The Attempt at a Solution I don't know where to start on this question. As far as I know...

I am by no means well versed in nuclear power, but from my limited exposure I have gathered that a very large portion of nuclear energy (and antimatter) is expressed in high energy gamma radiation. All forms of electromagnetic radiation are expressed as photons, correct? Taking the concept of...

A receiver that detects two transmitters will be "captured" by the transmitter with the strongest signal. So how does a CDMA rcvr operate when 100's of signals of the same strength, on the same band are trying to capture it ? I understand the Code [in CDMA] allows it to know which signal...

Hello! Homework Statement As the title says I am attempting to calculate the mass displacement of a motion capture sequence, however I am not seeing the results I expect which is why I am posting here to make sure I have understood everything correctly. The data that is known is the...

It seems I am having issues locating a valid Orcad Capture PSpice library with the 1N4000 series of diodes. I have downloaded Diode.olb, however when I simulate, I get an error such as: "ERROR -- Model D1N4009 used by D_D2 is undefined" From my understanding, this arises due to the fact the...

By default TCPDUMP limits the number of bytes it captures to 68. Why did they select 68 bytes? Does anyone know why?

During electron-positron pair production, does electron capture always happen? Gracias

So I have been reading about the cross section of neutron capture and have been reading about how the cross section for neutrons in a given material depends on neutron energy, the most important factor obviously. But I have not seen as much information on how, for a neutron of a given thermal...

Hi, Do you know of any motion video capture education software products that are aimed at the first-year college physics course level? Thank you.

I just link my microscope (Olympus CX31) with CCD (Sony), the staff 's company installed "Ulead program" in computer linked with CCD to capture the picture from microcope. The problem is when the picture shown in the computer, it is already too enlarged that we can't see the wider view as we...

First, I am curious about why CCDs need color filters in the first place. It is said that they are necessary because digital camera sensors can only sense intensity of light, but not wavelength (color), which makes sense initially... except that CCD sensors operate by utilizing the photoelectric...

I am working on some neutron experiments and have to calculate the heat released in the boron neutron capture 10B + 1n - > Li + Alpha particle The reaction has a Q value of 2.31 MeV. Is this entire energy converted to heat? Also, in the two types of reactions of neutron with Boron...

Homework Statement A helium-4 nucleus (rest mass 4.00151 u) is formed when a helium-3 nucleus (rest mass 3.01493 u), stationary in the laboratory frame, captures a slow neutron (rest mass 1.00867 u), in the following reaction. 3He+n→4 He+γ Determine the energy (in MeV) of the γ-ray in the...

Homework Statement Hello! I am doing some calculations with electron capture for the reaction \stackrel{196}{79}Au\stackrel{EC}{\rightarrow}\stackrel{196}{78}Pt The Q-value for the reaction is Q=[m(\stackrel{196}{79}Au-\stackrel{196}{78}Pt]c^2-B_{n} where B_{n} stands for electron's...

Does anyone know where I can find good tables for low energy nuclear processes? For example collisions to products like: - proton into a material yields neutrons - neutron into a material is captured to give different element - electron into a proton yields a neutron etc. Here's an example type...

Strange Optics Question: photon capture and reproduction Imagine that you are sitting in your room staring out your window at a tree branch and a single leaf about to blow off. Suddenly someone comes up to you and says "You know that window, that's no ordinary window, it is actually a black...

when nucleus capture the electron revolving in the shell?

as we know in L orbit there are two shell 2s & 2p. suppuse for an atom both shells are occupied , then what is the probabality of jumping of any electron from 2s & 2p shell to lower 1s in the process of K-electron capture process?

hello i'm new to using orcad capture 9.2 so I'm having problems with the simulation. i'm trying to simulate this regulator circuit using transient analysis. then when i clicked run, the green circle appeared. I'm wondering maybe you need to tweak something first on the parameters of the...

I can't even claim to understand 'spin' as a property (even after reading that big thread about it :P) but I'm sure with the amount of discussion that generated, this could be worth talking about http://www.ohio.edu/research/communications/spin.cfm

Consider a wind turbine placed alongside a road in a location with no wind. If a vehicle drives past (without loss of generality, at a constant speed) the turbine will spin and electrical power can be produced. The power produced is obviously supplied by the vehicle. As compared to the case...