Material Definition and 1000 Threads

Hello, there's something that's been bugging me for quite some time now, and i hope anyone can enlighten me on this. So i'll get straight to the point. Can heat treatment be used to make a material softer? In normalising, you can say that the longer the time given for the subject to...

In order to insulate single glazed windows, I have been experimenting with secondary glazing film. I don't know what material it is, but I am guessing this could be polyprop made very thin so it is transparent - is that right? However, it gives the windows a slight haze which is annoying. I...

Hi everyone, So, I'm currently in my second year (undergrad) of university studying nanoscience/physics in Canada. I try to think about my future career fairly often, so that I can do my best to make good decisions. However, I'm beginning to get the feeling that I'm not truly "mastering" the...

I have a question about source hardening: what is the reason for a decrease on the yield strength in the case of the 1-(Un-irradiated) Body centre cubic (bcc) 2- (irradiated) face centre cubic (fcc)

Calculating wavelength in a media Hi Trying to get how to calculate the wavelength of an electromagnetic wave in a media and I am getting confused about the permittivity. I know the formula: vphase = c/(sqrt(εr*μr)) where vphase is the phase velocity. c is the speed of light in a...

plastic extrusion material selection? Hey all, I work for a curtain wall manufacturing and design company out of Canada. I've recently been presented with the task of creating a new extrusion to improve the thermal performance of our curtain wall system. My question to you all is, and...

Homework Statement A toroidal shaped magnetic material of radius, a, and cross sectional radius R has a small transverse gap cut into it of length l. The toroid is uniformly overwound with a coil of N loops carrying a current I. Show that for a ferromagnetic material the field in the gap is...

I'm trying to get a value of the C0 capacitor of some piezoelectric material I'm working with right now. My only problem is: I don't get electronics at all ^^'. So far I have asked some other people who do get it, but there were going way to fast and are really busy...So I was hoping you could...

Homework Statement Homework Equations Working at a rate of 1.204 x 10^22 fissions/s, what fraction of that 70 kg mass of Uranium will be fissioned during the 550 days of fuel installation? (Fuel rods are replaced appx. every year and a half) The Attempt at a Solution 1.20x10^22...

Hello guys, nice to meet you all. It's kinda awkward since I'm new here and also just a freshmen in my university :) Anyway, I'm conducting a study about the LED components, whom I've already known it is consist of aluminium and Gallium Arsenide (GaAs) or Gallium Phosphide (GaP) or Gallium...

Hi all, This is not really a homework problem, more of a 'what-if' scenario but I'm not sure which section to put it in. For a science project we have been asked to look at material properites and come up with a project (which will have a presentation :eek: but that's another story). I'm looking...

I looking to make my own changing table to travel with. Want hard plastic material, non toxic that can hold baby weight. Any ideas?

I have to write a small paper on quasicrystals... anyone know where I can find free-access books and scientific journal papers on this topic?

I´m doing a little research on allotropic materials and decided to go with phosphorus... I chose white beta phosphorus, black phosphorus and red phosphorus. first question: since red phosphorus is not a crystalline solid but an amorphous solid, would you include it as an allotrope...

Hi, In our chemical company, the pipe spec for check valves prescribes stellited material for disc and seat. Now, suppliers are having a hard time meeting this specification. Are there other materials with comparable properties that are more commonly used? Mostly suppliers offer SS (eg...

As light moves through a dense material, it would interact with the atoms. Would the light lose energy, on average, in the process? As a result, would we observe a red-shift as it moves through? If so, what is the relationship between the amount of red-shift (energy lost) to the distance of...

Hi everybody, I am getting confused by a very simple problem: let's take an infinite sheet electrically charged with a surface density σ. Because the sheet is infinite, we can first determine that the electrical field on both side contains only components normal to the sheet. If the plate is...

I want to calculate the deformation of a plate of a material upon being struck by a mass moving along the plate's normal, and if the impact force is sufficient, if the plate will break or not. The given information can be assumed to be: mass, velocity, and contact area of the mass, and the...

Hi, I am a biomechanist looking into Achilles tendon injuries. I was at a conference the other day and they were talking about using tendons for ACL reconstructions and about tubularising tendons. This got me thinking. Is there a certain conformation of fibres that is stronger than others...

Lattice Constant: 7.956A – 7.936A Density: 3.696 – 3.691 g/cc Form: Polycrystalline Melting Point: 2150°C Young's Modulus: 46.9x106 psi Shear Modulus: 18.9x106 psi Poisson's Ratio: 0.24 Hardness: 1850 Kg/mm2 (Knoop Indentation, 200g load) Fracture Toughness: 2.0 MPa-m1/2...

hi, i'm doing a project on development of ceramic nozzle. can somebody help me by giving some information regarding the most suitable type of ceramics that have the good wear resistance and high melting point. thanks.

((Not certain this is the right place)) Hi guys, Currently I'm voluntarily undertaking a project qualification and have decided to write a report on Nuclear Physics and how it could be used as an energy source in the future. I already know quite a bit about this topic but was wondering if...

First of all, i would like to appologise if there is already a topic related to this on which i could have posted. I was not able to find it but also only skimmed through the search results. Mathematics has not been one of strong points. In middle school i struggled with it - i didn't spend any...

Hi ... my equations is : 1- if the refractive index of the dielectric material related with frequency ? if yes , is that because the permittivity relation with frequency or permeability or both of them ?. also i want the equation of refractive index relation with frequency. 2- in...

Hi all, I have search far and wide for this answer and could not find it. During the late 80's and early 90's Carbon 60 or Buckminsterfullerene & Graphene(I think) were a hot topic. In BBC's tomorrows world they demonstrated a safe made out of a material, which I think was one of those two...

Here is the problem: The electron concentration in a region of silicon depends linearly on depth with concentration of 5x10^15 cm^-3 at surface (x=0) and 10^15 cm^-3 at depth of x=500nm. If the vertical electron current density in this region is constant at Jn=100 A/cm^2, calculate the...

Hello PF'ers, a friend and I are sharing an apartment for the school year and we had the idea to make one of our living room walls into a giant whiteboard. I know you can buy rolls of the material to write on (doesn't have to be magnetic), but I'm not sure where to find it. I called the local...

I'm looking for a sheet shaped material, maybe 12" by 12" and 1/4 inch thick, that can be used as a seal to keep air out, so it needs to not allow air to pass through it and it has to be a soft material that can compress, but not compress or bend too much. I was thinking something like foam...

If I had an input of 4KW with Material S/S 304 Density(0.29 lbs/in3) Specific Heat(0.12 BTU/lb/°F) What temperature would the S/S level off at when the 4KW is inputted?? If I am missing any info to help solve this let me know...

We have 3 interstage coolers for a Synthesis gas compressor.Synthesis gas is mostly H2 & N2 with small Ar & CH4.Tube side fluid is water & shell side fluid is Syn.gas.The heat exchangers are made of carbon steel.Now due to corrosion in tube to tubesheet joint we like to use SS for tubes.But our...

So my mother buried her cat 5 years ago this month. I remember I wasn't home back then and it was a hard time. Yesterday we were talking about this and she asked me if I think the body is completely gone, and I said of course until she mentioned she put the cat in a plastic bag before buring it...

If you wanted to calculate the pressure on the shell of an airtight enclosed concentric or asymmetrical/symetrical object, do you simply need the surface area of the object and then divide it into the applied force? 1. So if you apply 50Newtons onto a grounded football for example,it would...

I'm not certain if the General Physics section of this forum is the place where this question will receive any attention, but here's to hoping! I am trying to identify a way in which one could accurately calculate which compound or element would serve as the ideally effective material for a...

Homework Statement In an experiment we were given a broken piece of alluminium that was (before broken) 50mm long. Then we measured it and found the elongation. From this it is pretty easy to calculate the strain. What does this actually tell me about the material though?. Actual Question...

What happens to the ions that are released from the material after e- are released? How come the material doesn't completely degrade?

Hi, I am a recent grad with a BSEE and I will be taking an exam for a job. The exam will consist of the following: RF Microwave Devices, Digital Devices, DC Electronic Theory, Electronic Measurements, Electronic Math, AC Electronic Theory , and Active Devices, I have knowledge of...

I am self-studying "Physics" (Volume 3) by Halliday, Resnick and Krane, and would like to ask some questions regarding the following example given in the book (with solution). I will copy the entire example here, with solution (translated from Portuguese, because I am using a Portuguese...

Homework Statement So today in class we did a lab where we calculated the stopping voltage of lights of different wavelengths. We did this experimentally. I have the wavelength, frequency, and stopping voltage of four different lights. I need to calculate the work function of the material, and...

Hello. This is my first post here and I come shamelessly looking for help. I'm an Electronic Engineer and have an idea for an invention but do not know if the type of material that is needed exists, the only one I can think of so far is Bread dough. Anyway, what is needed is something...

Can anyone suggest me good books on 'C/C ++ & assembly mixed programming' for embedded system coding. I am trying to gain expertise in mixed C/C++ & assembly mixed programming for writing embedded system codes. I am fairly new to mixed programming. I know C/C++ and assembly languages. Now, I...

I am building a model rigid airship, and in order to maintain it's structure I used a balsa frame. Unfortunately this weighs a fair bit and can take up to half of the lift generated from the light gas, and it is not particularly strong. Since I use polyurethane for the outer skin, I am...

Homework Statement Suppose you know the wavelength of light passing through a Michelson interferometer with high accuracy. Describe how you could use the interferometer to measure the length of a small piece of material. 2. The attempt at a solution - Sandwich the piece of material behind...

Homework Statement Stewart Calculus 6E: 4.7 #14 A rectangular storage container with an open top is to have a volume of 10m³. The length of it's base is twice the width. Material for the base costs $10 per square meter. Material for the sides cost $6 per square meter. Find the cost of...

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...

I took the first part of the college-level introductory chemistry classes (it's CHEM 1211 here). I took it a long time ago - 2002. When I took it, I didn't pay attention, it's a miracle I passed the class at all. And now I need the second part of the class. I'm worried that I'll be missing...

what is nano? how to obtain nano material ?

There are several online materials on general relativity. Here I would like to get suggestions about concise review of general relativity at somewhat advanced level. The idea is that this should be enough for recapitulating the area at advanced level by somebody who had studied it thoroughly...

What is exactly is a "non-conducting material"? Homework Statement In many Gauss's law problems, we are often presented with "consider a nonconducting sphere with radius..." I realize most of the time we aer suppose to assume it is an inductor, how are we to know it is NOT an...

or a hoax? http://www.telegraph.co.uk/technology/5158972/Starlite-the-nuclear-blast-defying-plastic-that-could-change-the-world.html Seems there was only 1 post on PF in 2004 on the subject, but it seems to be resurfacing. What happened to it? Is it a hoax?

Fairly simple question: If a highly permeable material (of any shape) is placed in a uniform magnetic field, will the material's magnetization density always line up with the uniform magnetic field, or do I have to take into account the fields that are created as the material becomes...