Material Definition and 1000 Threads

Homework Statement In the figure below (see image in color), light travels from material 'a', through three layers of other materials with surfaces parallel to one another, and then back into another layer of material 'a'. The refractions (but not the associated reflections) at the surfaces...

I was wondering because I'm interested in getting a Materials science graduate degree, but was wondering if my options would be limited to experimental work. What sort of work would comp. materials science involve? My rough guess would be creating models/simulations of materials as opposed to...

I am trying to make a floating sentry bot ; though, my plan was to use Helium or with a mixture of Ammonia. I want to find the minimum amount of gas in a balloon require to reach the max height the object should float. I know the buoyancy force is Density * Volmin * g : where the maximum...

Homework Statement two point charges in free space are separated by distance d and exert a force 2.6 nN on each other. The force becomes 1.5 nN when the free space is replaced by a homogeneous dielectric material. Calculate the dielectric constant of the material. Homework Equations I...

Homework Statement I have a project for my Materials Science and Engineering class and we have were given 4 unknown materials and we have to determine which kind of materials they are. We have to come up with our own experiments. As of now, I've done the Rockwell hardness test, electrical...

I am trying to understand how to tackle torsion of bars that are non-circular and two-material composites. I understand the process of finding the torsion constant for non-circular sections but I am not sure how the warping function changes across a material interface. For example, if I have...

What is mean by carbon based material "C0.2"

Hello , Pursuant to a relentless mugging into material data sheets,I am still unable to identify the material of a component corresponding to the hardness of which i measured using an ultrasonic equipment. its 240-260 HV(vickers).I need to know the material for procuring the component to the...

Is it normal for university exams to never include some of the material that is in the curriculum? I have some modules that are quite extensive, but about 4 to 5 groups of exercises appear to repeat in the last few years. However, they also ask for students to study about 10 to 15 types of...

How does electron in a piezoelectric material flow to produce electricity? I read about piezoelectricity but I don't know exactly how it works. When stress is apply to piezoelectric material, the structure deform and create non-zero dipole moment and then what happen? How does electron flow...

Keep in mind that I would post this in math and science material but I have insufficient privileges for some odd reason I am going on a 15 hour road trip, and would like some Introductory Physics audio to listen to on my iPod. IF anyone knows of anything I could listen to it would be...

Hey everyone, I'm starting calculus in a few weeks, and I've been wanting to pick up some supplementary material. I'm using the Larson Calculus book, 9th edition- https://www.amazon.com/dp/0547167024/?tag=pfamazon01-20 - which I've read very mixed reviews about. Some people say it's a great...

I was wondering if anyone could suggest a material that would stay in a solid state within molten steel/aluminum at least for several seconds. There are also two things: 1) the material should react to a magnetic field applied from the outside 2) material's density should be less than that of...

Is there any additional material, besides the 4 practice tests (86,92,96,01) and the solutions on grephysics.net? There was a site up a few months ago physicsgrad.org or something but seems to be down now.. and it was an awesome site.

Hi everyone, I plan to major in nuclear engineering and material science and engineering. What field of study can I integrate both disciplines? Which field in nuclear engineering is currently most active? Thank you,

Hello friends, Every object has certain color, because it reflects that potion of light & absorbs all other visible radiation, What is the mechanism that happens on the surface of a body, which makes it reflect certain portion & absorb rest portion.

Hi, What is the material which would develop powerful vibration for a sustained period when they are stroked with another material(may be the same or a different material).

I was wondering if anyone has ever tried to model/fit a crack on a material surface with a Weierstrass function.

What material is most suitable as a filler for pillows, which material can provide optimal comfort and neck support? Examples of Filler Materials: Feathers Buckwheat Cotton Cloth Fibers Synthetic Plastic Fibers Foam Viscoelastic Foam Memory Foam Latex Compressed Air Examples...

I was pondering this while I was staring at a salad dressing bottle at home (an oily dressing that doesn't stay mixed when untouched for a period of time...), how well could you mix (shake up) a bottle with different oils in a micro-gravity environment, if at all? Moreover, my actual question...

Is there a type of piezoelectric material that only produces a current when bent one way or only bends one way when applied a current?

Hello Everybody I want to do the comparison of metals like Silver, Gold, Aluminum, Copper, Sodium and Potassium as plasmonic metals. Now, I am confused about some parameters about what they really mean. 1. what does ε(int) means? Is it better for a plasmonic material to have less ε(int)...

Homework Statement Suppose we have a lens of known focal length, f=100 cm. (a) If light enters the lens from air, but after the lens enters a medium with index 1.33, how far from the lens will focus? (Assume the incident light is collimated.) (b) What if there is instead air after the lens...

I am looking for a material that will change colors depending on how long it is in the sunlight. Any thoughts?

Problem: I have a 2 acre pond from which the water exits via a stand pipe (vertically 10' then horizontally 70'. The stand pipe has become clogged with vegetative material (I left out the ounce of prevention). We have exhausted plans A - F of attempts to mechanically remove the clog with zero...

Hi! How can I tell, based on my Raman and X-Ray Diffraction studies, if a thin film is nanocrystalline or amorphous? The maximum thickness of my films is about 200nm, the XRay diffractograms showed nothing but the substrate (is it because of the thickness?), and my Raman spectra showed some...

Are there any easy to obtain and fast responding photoresistors out there ? The resistance of material must decrease when light in shining on it, and the response must be fast. Note: I know that photodiodes respond extremely fast but they must be used coupled with a transistor to amplify the...

Hi all. I am doing a project in which I have a 99%clear transparent Silicone sheet. LEDs make light pass through this material which is than picked up by phototransistors on the other side. when someone/something touches the Silicone, this deforms and the phototransistors pick up different...

What happens when radio waves of around 1900mhz (cell phone) is confined in an aluminum box. Will the waves be able to pass through the box to the outside. What would be the best way to get the waves to the outside of the box with only modifying the box. If i cut a hole would that improve how...

Could someone suggest me an easy guide to transforming a system of differential equations into normal form around a particular point? As I understand, normal forms are used in border collision bifurcations to define the new set of coordinates around the parameter value \mu _0. By doing this...

I want to learn some basics of Computational Fluid Dynamics.But most of the books that I found dealt mostly with the theory of it with very less examples or problems to be solved numerically. I know Matlab and am pretty good at coding too.So, I am searching for a book from which I can learn CFD...

What is the name of this parts and what is the material is used to make this part? http://upload.wikimedia.org/wikipedia/en/8/8c/Stone_Grinder.jpg Thank you

I wonder what is the material is used to make an electronic chip? http://datasheet.seekic.com/ImageFile/MCP/Microchip_MCP4922-E_ST85280.jpg"]Image[/PLAIN] of an electronic chip. I also would like to know what is the material of the bottle of the coca cola soft drink? Is it pure silica glass...

Why the ground state HOMO level of a molecule with two opposite-spin electrons, is singlet while we know that a level with two opposite-spin electrons may be singlet(s=0,m=0) or triplet(s=1,m=0)?

Hi Everyone, I am basically a post graduate student try to set up my own business. Its a mechanical based business. I come across activities like material selection, fabrication, machining & installation and commissioning. In short turnkey projects. Since my activities are customer based...

As you know,the set of light wavelengths that a material is transparent to,is sth dependent on the properties of the material.My question is,can we find a material which is transparent to a specific wavelength range? For example,I want a material,which,among the visible light wavelengths,is...

I am in process of doing a project for school. The basic aim of the project is to address the following issue. I live in a country where we have a lot of street vendors and beggars that stand in the street at night and as a result are not visible to oncoming traffic. i would like to create a...

I need help exploring this question: what makes a solid transparent/opaque? If I have clear sheet of plastic and I introduce imperfections (such as small air bubbles inside), it turns white if the # of imperfections is large. Is it possible to maintain the polymer transparent with such air...

Hello, I am looking to read up on some popular science kind of books on Materials Science and Engineering. Something on the lines of "future of materials" or "materials of the future". Does anyone have any recommendations? Thanks

What is meant by the sub-material? Such as if you mix three differential materials, for example, coffee + sugar + water, which one them is the sub-material? Thank you

Hello, I was wondering if anyone could tell me of an easily available (to a primary school teacher) solid material that conducts electricity, but noticeably poorly, so that it can be demonstrated and hopefully performed by 9 year olds. To be exact, I want a solid material that can be...

Hi all, I am looking for the best material for IR (infra red) absorption, preferably something that I can make it into a thin film; any material that would work from semiconductors, metals to more exotic materials like graphene or... I appreciate your help. Thank you

Homework Statement A) To= 35 °C find α And β B) determine the temp in which this material becomes a super conductor as predicted by the equation below. ρ=ρ0(1 + α(T-To) + β(T-To)^2)To= 35 C. ρo=2.5e-8Ω m T1= 0 C. ρ1=2.346e-8Ω m T2= 100 C. ρ2=3.036e-8Ω mHomework Equations ρ=ρ0(1 +...

Homework Statement I am trying to enter the strain and stress properties of a piezoelectric material, I only have d31 and e33 constant with no dielectric constant. I don't know how or where to enter these values in Abaqus since it ask for a Matrix. Homework Equations The Attempt at a...

Hey everyone! I am currently working on a project regarding the synthesis of variously substituted isatins using the Sandmeyer methodology, involving the condensation of chloral hydrate, hydroxylamine and substituted aniline (in this case the 4-ethylaniline) to nitrosoacetanilide with...

Hi everyone, I got some past papers to revise for my second year final exams in may the course I am in is called electrical and electronic engineering (I am studying in the uk). I was just hoping if any of you guys know any good youtube channels like khanacademy but for engineering topics...

Hi, I'm looking for a good beginner text on Wavelets. Preferably an undergraduate or early graduate level. The background material that I'm missing most is infinite dimensional vector spaces/function spaces and Fourier analysis. Any advice would really be appreciated! Thanks!

In the future I would really like to enroll in an aerospace engineering course and I was wondering if there are any good books out there which cover the important parts of this discipline? I came across the following page which contains some of the topics that will be taught in university (at...

So basically I'm not sure of the solution and just want someone to tell me if what I did is correct. It's important I have an upcoming exam. Thank you.

Is there any material or book that explains how one could go from data to differential equation comprehensively? More like functional data analysis+differential equations