Material Definition and 1000 Threads

I've stumbled upon a problem whilst doing my master thesis The problem is to construct the anisotropic conductivity tensor for a material that exhibits Anisotropic magnetoresistance. The problem has left me quite baffled, and coming to think of it, I've never seen a proper treatment of...

Homework Statement For bacteriological testing of water supplies and in medical clinics, samples must routinely be incubated for 24 h at 37°C. A standard constant temperature bath with electric heating and thermostatic control is not suitable in developing nations without continuously...

Might absence of dust on moon (such as for astronauts' experience) relate to importance of material sciences? That is, might surfaces interact electronically, seeking a more stable lowest energy configuration? Imaging it as if 2 grates rubbing together, seeking best fit? Air might then disrupt...

Homework Statement I have a linear dielectric material. The electric field in the material is 38% less than a vacuum field with the same external sources. I need to find the susceptibility of the material? Homework Equations I used P=\epsilon\chi(vacuum)E P=\epsilon\chi(material).62EThe...

Homework Statement A very long cylinder of liner dielectric materil is placed in an otherwise uniform electric field E_0 . Find the resulting field within the cylinder. (the radius is a , the susceptibililty \chi_e and the axis is perpendicular to E_0) Homework Equations The Attempt at a...

I'm in a "series and sequences" class. Up until power series, if I studied the material a decent amount and did a lot of practice problems, things made sense. We got to power series today and I simply am not getting anything. I read the chapter in the book just now and it totally lost me...

what's the difference? it looks like a chemical engineer and material scientist does the same thing

It is a bit hidden in the page, because you cannot get the links directly from the main page. But an easy guess lead me to this: http://www.mighty-security.com/loop/resource.htm It is now up all audio and video recordings of the conference.

Homework Statement A block of a certain material begins to slide on an inclined plane when the plane is inclined to an angle of 12.95°. If a solid cyclinder is fashioned from the same material, what will be the maximum angle at which it will roll without slipping on the plane? Homework...

Hi, this semester in uni I took a very overwhelming load of technical/problem solving courses. I ended up dropping two courses and now I have a pretty light load. The problem is my bad habits lead me to procrastinate heavily on my studies for the first month of the semester. Luckily, I feel the...

Homework Statement Find the temperature distribution in the rectangular sheet given the following boundary conditions: U(0, y) = U(a, y) = U(x, b) = 0; U(x, 0) = f(x) Homework Equations U(x, y) = (summation) B (fourier coefficient) [sin ((n*pi*x)/a) sinh ((n*pi*y)/a)] The...

Failing tests... So far in my honors pre-calc class we have taken 3 tests. My grades on these tests have been 57%, 73%, and 63%. i understand all the material in class and have no problem on the homework, but when i take the tests i get so nervous i rush through the test and i make stupid...

I'm a layman so the following terms are not to be taken to the first degree. I'm searching for a material that offers preferential permeability to magnetic fields. In the article I read (and subsequently lost) the material is offered as an alternative to a Faraday cage in that it doesn't...

Hello everybody! I am majoring in Applied Physics. Now i am asked to choose my specialisation option between Renewable energy and Material physics. Actually, i think that i can feel comfortable to any option between those but my problem is that i have to choose one. So which is the best between...

Hi, I am trying to make a electromagnet to attract a ferrous material.. Currently I am using Iron and permalloy cores for my coil electromagnets, but the residual magnetism is higher than I'd like. Is there any material with a high magnetic permeability AND low residual magnetism? Thanks...

It will be rotating fast, so preferably a low density and high tensile strength. It also needs to be nonconductive, and it will be exposed to some heat generated from electrical coils. Thanks!

Homework Statement In the attachment. Homework Equations The Attempt at a Solution

Hello, I want to simulate a plane thin rectangular board attached to one spring below at each end. (So there are 2 springs in total.) The springs span the entire edges. The spring-board-attachment is a rotatable axis. I can't find out how the force acts on the springs. I don't know whether...

Hi, I am currently constructing a science fair project, and I was wondering if anybody knew any thin material that was relatively light weight, cheap, and as strong as wood. I understand that carbon fiber exists, but this material is rather expensive. If anyone knows alternatives to using wood...

Hello-- Suppose that I insert a thin-needle thermometer into a porous material (such as snow) that consists of air, ice, and water. The thermometer is used to measure a temperature. Is it reasonable to assume that the temperature measured by the thermometer is the same as the temperatures...

Hi, I'm new to the forum, and I'm looking for input. I'm looking for a material that when it comes under pressure or is deformed, develops a magnetic or other resistant force that is released when the pressure is released and it is allowed to return to its original state. This could be on a...

Can anyone give me some suggestions of some essentials, calc or non-calc, that I should review and be comfortable with in calc 3? I know trig sub is supposedly important, and I'm assuming other basic derivative/integration techniques will be coming up a lot too...a lot of topics are bound...

Hi Guys, Does anyone know any good sources to learn the more advanced probability topics such as multivariate distributions and joint distributions etc.. For example, on youtube, there is a large collection of "Probability on Excel" videos by a user called "Excelisfun". The fact that all...

Hi, Would somebody know if it is possible to bond pvdf piezoelectric material on glasse or teflon without making it losing its piezoelectric properties? Thank you! Damien

Does anyone have any experience with liner material for application on pipework with internal corrosion/erosion? Pipes are designed to hold water/methanol vapour Normal operating conditions for the pipes: Temperature • Average temp - 172F • Max temp - 267.1F Pressure • Average...

I like to play and abuse RC car models like this: However, when making big jumps or high-speed crashes (they can even reach 90mph), even steel parts gets damaged and needs to be substituted. See these damaged/broken parts for example: http://img169.imageshack.us/img169/4286/cimg1700.jpg...

Does anyone have any experience with liner material for application on pipework with internal corrosion/erosion in a Methanol Regeneration System? There are issues with internal pipe corrosion in a Methanol processing systems I am dealing with. To alleviate the current high rates it has...

Is there a limit to how strong a material we can create? Does yield strength have an upper bound, and how high is that upper bound above materials created today? What about hardness? Is Diamond the limit? Could we ever make a machine that could survive the pressures and temperature found in...

Hi everyone, this is not a homework, I'm actually dealing with the case in real life here. If this turns out to be standard textbook stuff then I'm sorry as I haven't studied this before. Suppose a plate capacitor has two different dielectric material layer sandwiched in it. Then a fixed...

Homework Statement [PLAIN]"[URL=http://img193.imageshack.us/my.php?image=63378846.png[/URL] Fig.A shows the balanced position of a light rod carrying an object X and a mass M . Fig.B shows the balanced position of the same system when X is immersed in water.If the density of water is d,the...

I'm looking for a 1/8" diameter rod wiper, or anything else that could be reliably used to allow a 1/8" diameter steel rod to slide very slowly past it while maintaining cold oil (at about 0 celsius) on one side at several hundred psi, and standard pressure air on the other side. Anybody...

I am wondering if there is a heat absorbing material that can absorb heat material at high rate , especially in summer and that heat can be converted to electricity for storage in my battery bank to light my LED lamps.[SIZE="5"][FONT="Arial Black"]

I am working on a science fair project that will concentrate sunlight and then separate it into 3 sections, visible light, infrared light, and everything else (ex. UV). Each will have its own use. I was wondering how to do about the dispersion of the light. I was originally going to use a...

The two blocks shown in the figure are initially at rest. Despise the masses of the pulleys and the friction between different parts of the system. Get (a) the acceleration of each block and (b) the tension in cable. Answer: (a) aA = 2,56 m/s^2; aB = 1,28 m/s^2 (b) 677 N

Hi everyone, time for my first post. I just got my Associates in Civil Engineering Technologies, and have decided not to go for my BS because... its really boring. I need something more. Something sub atomic. So This fall I will begin pursuing a BS in Physics / MS in Mat. Sci. &...

Hi, I am trying to calculate the capacitance of a non-parallel plate capacitor and there has been few discussions on this research in this forum. Some of the people have pointed to this material by Fred Erickson, The material link is not valid anymore. I was wondering if anybody has...

I understand the distinctions of the different types of material strengths, but I get stumped when asked about how they apply when the material discussed is thicker or thinner. Any help?

Hey there, I'm new to the forums, while I did get an A in my physics class, in no way do I consider myself an expert. That's why I figure you guys could answer my question best. I am working on a project and I was wondering what the most shock absorbent material is that I could purchase...

I'm unsure how to approach this, as solid blocks of materials next to each other (e.g. steel and air) with no barrier inbetween as shown on http://en.wikipedia.org/wiki/Thermal_conductivity "x" would equal zero, this can't be correct. Is there another equation relating temperature difference...

Hi, I'm searching for a machinable material that in electrically non-conductive and can withstand temps up to 400C. Preferably looking for round-stock > 3"-diameter. I've already looked into machinable ceramics but the cost is > $100 / In. Some type of sheet might work too that I can cut...

hi. I'm relatively (no pun intended) new to quantum physics. I just finished my high school physics class which mainly dealt with the basics and classical physics. Can anyone suggest some papers or articles I can read in order to get my feet wet in this new realm? Thanks.

Homework Statement A parallel-plate capacitor has plates of 10 cm^2 area separated by a 0.10mm layer of glass insulation with resistivity rho = 1.2x10^13 omega*m and dielectric constant k= 5.6. Because of the finite resistivity, current can leak through the insulation. How do I Show...

Hi everyone, Is there a material which, inside a solenoid, immediately or in a very short period of time gets magnetized as current is switched on and then stays magnetized for a while if the current is switched off? For if this were true then this would mean we could derive more energy out of...

hey guys.gals am currently working on a school project. and i would appreciate any help on what would be the best materials in a system that involves isoprene(2-methyl-1,3-butadiene) and 3-methyl-1-butene. and help on the properties of this liquids would also be apreciated. are they corrosive ...

Hello Everyone, I am new to this forum and am actually just curious to hear if you can help me with something? The reason I joined this forum is because I am interested in finding out about being able to get some of that material, which NASA uses for its space shuttles...the heat-absorbing...

Homework Statement Consider a sphere of magnetic material with radius R and magnetisation M in an applied field B_{applied}. Find an expression for: a) the total current flowing around the surface of the sphere; b) the net field at the centre of the sphere. Homework Equations...

Homework Statement Write down an expression for the current density per unit length flowing at the surface of a magnetised material.The Attempt at a Solution Any ideas?

Hi, just wondering from all the A/S level physicists here if you have seen any info on the pre-release material...

In my current experiment, I am using a wind tunnel to test laminar flow over airfoils of various designs and at various angles of attack. My current dilemma is in deciding how to construct the airfoils. I am looking for a method that is precise and realistic. (At this stage, I am not worried...

Homework Statement http://www.apeg.bc.ca/reg/past-exams/documents/May2005-98-BS-6.PDF Page 3 - Question 2 Except that let M=60 N.m (instead of 75) Homework Equations Transformation Equations: Z = z * E / E(ref) The Attempt at a Solution Transforming the composite bar to a...