Materials Definition and 919 Threads

A 3d printer that could print metal and other materials would revolutionize everything. The only problem is that metals have a really high melting point, so if you try to get a metal hot enough to bind to the other metals in its vicinity it would probably destroy the bonds of the neighboring...

A lot of people know the example of a carpet and a doorknob. You accidentally rub your foot to the carpet and then get a static shock after touching the doorknob. Why does carpet produce higher static electricity than for example hardwood or something. Is it because of the hairs? Is it because...

There are 5 fantastic videos in this website: http://www.alfredleitner.com/ He is a very good educator and it is also very good to see those authentic experiments and aparatus. Anyway, in the following one at exacly 8:00 minutes he says that the phase lag induced by the dipole is always 90...

i) Use EduPack Level 2 Sustainability to find the Polymer materials that satisfy ALL of the following criteria: - Maximum Density permissible is 1800 kg/m3 - Maximum Operating Temperature must be at least 100°C - Yield strength (Elastic Limit) > 50 MN/m2 - Can be injection moulded From this...

I need some help with the question that I have attached. I think I should say that the beef burger is tough and brittle but the tooth wrenching is not tough but it's elastic . or maybe it's tough and elastic. basically the beef won't have plastic deformation but the tooth wrenching has...

I appreciate some helps with this question. I understand that soft noodles is not as strong as calamari squid and breaks easily . I also know that that calamari squid does not have elastic behaviour since behaves like rubber band and it goes back to it's original shape after reloading. But I'm...

The question is as follows: Solutions given only contain part a) to c), which is as follows: So I now try to attemp d), e) and f). d) The magnetic field of a uniformly magnetized sphere is: $$ \vec B =\frac{2}{3}\mu_{o} \vec M = \mu_{o}\vec H$$ $$\frac{2}{3}\vec M = \vec H$$ The perpendicular...

WASHINGTON, D.C. – The U.S. Department of Energy today announced $16 million in funding for 17 projects as part of Phase 1 of the Advanced Research Projects Agency-Energy’s (ARPA-E) Ultrahigh Temperature Impervious Materials Advancing Turbine Efficiency (ULTIMATE) program. ULTIMATE teams will...

Hello friends, For example; While the carbon ratio in CK45 steel is between 0.42-0.50, the carbon ratio in ST-52 material is 0.22. Is the important factor in the quenching process the carbon content? In here, can we make quenching to CK45 and ST-52? In other words, which types of materials can...

Hello there. I set up the problem like this, I have a wave incident from air on the anti-reflective coating consisting of: ##\tilde {\vec E_I} (z,t) = \tilde E_{0_I} e^{i(k_1z- \omega t)} \hat x## ##\tilde {\vec B_I} (z,t) = \frac 1 v \tilde E_{0_I} e^{i(k_1z- \omega t)} \hat y## This wave gets...

The concepts of bands is a useful tool in describing electrons in solids, but as far as I understand it arises naturally only when the real interacting system of electrons can be mapped with a very good approximation to an independent-particles problem (a mean-field approximation). If I have...

I have to design and assemble a solar water heater for a small Anaerobic Digester system. It will have two connected sections, using pipe, ... one assembly section to collect solar heat, one assembly to radiate the heat. Attached is an illustration. Please disregard the pipe arrangement design...

Summary:: Need help with finding values using Fe c diagram Hi, I'm doing a materials engineering assignment. In the assignment they require us to make 3 swords being given martenistic steel bars with dimensions 40x100x1000mm with a composition of Fe-0.76wt.%C (eutectoid composition). Sword A...

Hi, I just wanted to know if anyone has any experience with a textbook that deals with topics like crystals+lattices+symmetries, diffraction, microstructure, mechanical behaviour of materials, etc.? Thanks.

Greetings, I am enrolled in a graduate level course to HPC computing. The lecture, however, is often very superficial. For example, after the session to processors, I was left wondering about the differences between clock cycles, machine cycles and the difference between FLOP count and clock...

Hi and thanks for taking the time to read my question. So, if i take an element and place it on top of another element and heat it, will the heat energy pass through the first and charge the other or it'll melt both elements? Thanks!

Ok so I am building a fume hood What materials are the most resistant to chemicals that are also cheap? also what cfm fan can I use to suck out the air? (asking for someone knowlageable) cats

Are the felt and foam seals used inside clothes dryers made of different materials than the felt and foam seals used for weather stripping? They look the same. Sites that sell replacement seals mention attaching them with "high temperature glue". Do any glues commonly sold in hardware...

Are sound waves in air affected by wind? If the medium of the air propagation travels forward, does the sound also travel faster or is the sound simply vibrations in positions of space which disregard the movement of its medium. Would a transverse wave similarly move faster? If I was to...

Please help me A certain steel tape is known to be 100000 feet long when the temperature of 70°F . When the tape is at a temperature of 10°F, what reading corresponds to a distance of 90000 ft? Coefficient of linear expansion of the tape is 5.833 x 10-6 per °F.

I just read an article about how electrostaticly charged filters, such as hvac filters, the charge is reduced if soaked in ipa or washed with soapy water. I know some peoe want to save money so they wash the filters. My question is, why does rubbing alcohol and soapy water cancel the charge...

Hi all, i need Permissible stress (Shear & Bending) values of various materials that is used for shaft design, as like below. Is there any software or excel sheet. kindly let know.

I wanted to ask - why do some materials with very high transmittance inevitably start to absorb in deep UV? Is there an explanation?

Hello, so I am not actually seeking help sketching the stress strain graphs. However, I am rather confused about the last part of the question to comprehensively label the stress-strain graph of copper with the limit of proportionality etc. Evaluating the graph, it becomes clear that these...

After seeing Putin wearing a full face respirator and gown while entering hospital with Covid and seeing a local doctor wearing one too. I ordered the 3M full face respirator like it. But I'm not sure what kind of gown or coveralls to gets. There are many local advertisements about the gown but...

I know only about Laminated,Iron and wooden coil.I don't know what is Air cored coil. So according to me,it should be Wooden cored coil because less current will flow through wooden cored coil.Ans it will be maximum in Iron cored coil. Please tell,am I correct or not?I don't know the answer.

Hi, I have to check some questions answers for my homework (Problem 3.5 and 3.6). Please help me find this book solution manual.

As you all know, everyone is in a mad DIY mask rush right now as it has become an official recommendation. Some have been searching for the best materials, and some of them have been found to be great filters. However, these non-standard mask materials are also not tested and evaluated for use...

When two materials of the same type or different type collide or rub against each other (either slightly or vigorously) that happens around us every day everywhere At the molecular level, do they lose any particles/atoms because of the collision?

Summary:: I would appreciate it someone could help me as my mind is completely gone on this and I am struggling to get the correct answer. Hello, I am trying to use this formula to fill in the rest of the table and I expect to get an answer between 0-5 x10-11. However i am getting nowhere...

Hi all! So recently me and a group of friends have begun working towards the construction of a cyclotron - and I was wondering, if anybody here would have an idea what kind of materials would be able to be used for the vacuum chamber that aren't specific Aluminium Alloys such as 7075 or 6061...

I'm new to the world of acoustics, and I've been reading up on various methods for wireless communication/sensing through ultrasound, especially with piezoelectric materials such as AlN. Fundamentally, I can't seem to find a difference between thin-film bulk acoustic resonators (1 um thick) and...

Homework Statement:: n/a Homework Equations:: n/a Hello , I am researching some material science and looking for suitable structural materials for high altitude , low level orbit flight . Would a carbon structure be suitable or would there be pressure problems that cause structural collapse ?

What is the different between fissionable materials and fissile materials? And how I can distinguish between them?I am deeply looking to your answers. Thank you

I just wanted to ask something that's being bugging me for quite a while now, if you don't mind. In standard testing, Biological Materials often are found to have impressive strength characteristics, for example, both Type I Collagen, the supporting protein of muscle (And I think Skin as well)...

I converted dm3 to m3, all the degrees to kelvins and found out the specific heat constants of iron and aluminium (0,45 and 0,91 KJ/kg K), but now i am failing to understand how this was supposed to be calculated. The equation given doesn't really help, as there are two unknowns in it: Q and the...

Q : 1 Materials that can control moisture in themselves ? (I want to know which material has properties similar to this.) 2 Materials that know moisture content without measuring ? (I want to know which material has properties similar to this.) 3 The material has a uniform moisture distribution...

True black materials theoretically absorbs all wavelengths of visible light. True white materials reflect all wavelengths of light. If a material which was black at room temperature was heated up to incandescence so that it was emitting all visible wavelengths (white light), and then light was...

Hellooo I have another questions about that fact that we have only a few solids that are ferromagnetic. In ferromagnetics i also read a few time ago it is important to consider 2 things about the reason why there is no magnetizaion. And i don't really understand both reasons, so i hope you can...

For the second one I thought I'd find the shear max caused by the first torque, and use the value as my radius in Mohr's circle, then proceed to find the stress and shear caused by the new torsion and moment (in terms of M), and proceed to use the criteria to solve for M. I seem to be going in...

Hi, So,I'm helping a guy with his mechanical engineering homework. The problem is that the guy is so off, he doesn't even know the name of the subject. And honestly, I having a hard question finding out what this question is about. I need to proove the Zb=h^2/3 thingy. I have no idea what this...

I see new environmental friendly glass materials coming in the future. Is it possible for companies to make new cathode ray tube monitors with 100% green environment friendly glass materials. How will this work?

Hi, for lower frequencies most electrical devices use laminated electric steel , like transformers and motors. But this makes the core made up of individual metal sheets and in older transformers taking the core apart sometimes results in the individual sheets falling apart. Is there any...

Hi, I would like to know if there is some current conduction with hole in semi metal ? thank you

I have plastic which contains large amounts of Co-60 and Cs-137. I have already calculated the integrated (50k years) deposited dose from the gamma radiation using Monte-Carlo methods (SCALE). I am now interested in the contribution to deposited dose from the Beta emissions. -I am assuming that...

Not sure if this thread belongs in this section. I was thinking who could give a better advice than the teachers themselves? Please do move the thread if it does not belong here. Thank you. I am first year non-physics student. I kind of never had any experience with physics. I have about 3...

Hello everyone Currently, I am trying to optimize CuO unit cell and CuO(1 1 1) through using gaussian interface and DFT calculation method. can somebody guide me the appropriate parameters in order to do that because so far all the basis sets and functional have failed to work so if you could...

First, let me apologise if this is in the wrong thread, wrong place, or wrong forum. I've not had any good experiences so far getting an answer I can understand, because my maths education didn’t really prepare me to even begin to try to figure this one out! I'll try to explain the situation...

A) What are the modern techniques used for enhancing the thermal conductivity of Phase changing materials (PCM) ? B) what are the negative effects (disadvantages) of using old methods of enhancing thermal conductivity of PCM ? ( construct table ) C) what are the different techniques used for...

I have read, heard and seen texts and youtube videos about the slowing down of light through matter, and also about why some materials are transparent. I am satisfied with the explanation of the slowing down of photons through matter, but not the explanation of why materials are transparent. I...