Carbon Definition and 522 Threads

Can someone help me in finding information on the classical treatment of the potential in a carbon nanotube.

Hi, I have the following problem, for which I am not sure if i should be making assumptions. "a solid fuel assumed to consist of carbon and hydrogen only is burnt in air. an analysis of the dry products of combustion yields the following results: Oxygen, 02 = 5.45% Carbon dioxide, CO2 =...

as there are dienes, trienes, qua-enes, etc. allenes and what limits it or prevents it from continuing on. i.e c=c c=c=c diene c=c=c=c triene-enes (c=c=c=c=c=c=c=c)n with each end "capped" by a -CN

from UPI Materials: Carbon nanotubes in an ancient Damascus sabre Nature 444, 286 (16 November 2006) | doi:10.1038/444286a; Received 24 July 2006; Accepted 25 October 2006; Published online 15 November 2006 http://www.nature.com/nature/journal/v444/n7117/abs/444286a.html M. Reibold1,2...

Hi All, I m designing a carbon monoxide detector circuit, I bought the MQ307A carbon monoxide sensor but unfortunately i was not able to find on the net any useful documentaion related to it :( Please I urgently need your help to solve this problem All i found out is the datasheet but...

I'm developing a range of carbon fiber cases for guitars, violins and laptops. The cases have a suspension system of high density closed cell foam pads which hold the instrument where it is strongest eg base of the body, where the neck joins the body. It has been suggested that it would be...

when i was using Scanning Electron Microscope to investigate fracture surface of a metal sample,the results of composition of it appeared so different to what the composition should be, that sample contains 2% carbon comparing to normally 0.1%. i thought there are 3 ways of doing that...

Hey all, :smile: I'm new to this board. I really think it's great, and I love to visit whenever I have the time. Mainly to read. But now I have a question. I recently did an experiment forming carbon from sugar and conc. H2SO4, but the precipitate is so fine it emmediately clogs the...

I was doing a test on the other day and i came across a question.The question is: What is the element that cannot exist naturally in Earth? A.Gold B.Silver C.Carbon D.Sulphur I choose carbon,but my tuition teacher said he thinks it is sulphur.He wasn;t very sure of his answer...

I think that I mentioned here sometimes that more CO2 would mean more biomass and that the annual fosil fuel use would produce enough carbon to reforest an area as big as France. Guess what's happening: http://visibleearth.nasa.gov/view_rec.php?id=2138

Hello, this is my first post on yours forum, I thing it’s great. I’m reading it for some time. But I’ve registered because of problem. I’m an archeologist. Within archaeology C14 Radiocarbon dating, a radiometric dating method is considered an absolute dating technique. But in discussion with...

could you have a long chain of c=c carbon double bonded to carbon each carbon would be sp hybridzed, with two pi orbals bonded to adjacent carbons c=c=c=c=c=c=c=c=c=c=c=c=c=c=c=c=c=c=c=c going on for millions or even billions of repeating elements which would be in resonance c-c...

The first half time of radioactive carbon (14C) that got some consensus is the Libby date of 5568 years, which is still used.. See Wikipedia The latter is very fortunate, calibration tables, like the current INTCAL04, being independent of half times for determining age. So calibrated...

Hi guys, I need to find material compatibility to carbon steel AISI 1045 that is available locally. The closest that I can find is the SWRH 42A. All of the chemical composition matches (C, Si, P, S), except for Mn. AISI 1045 has Mn content of 0.60 - 0.90, while SWRCH 42A has Mn content of...

The subject of cow flatulence and methane causes me to wonder what happens to the carbon in the grass that grows and dies naturally. When grass rots, how much of the carbon is converted to soil thus trapping the carbon, and how much carbon is released as CO2 or methane? I assume that this...

Greenhouse Gas Effect and Carbon Dioxide I have been having some difficulty with this, so perhaps someone could please sort out any mistakes, and let me know. Consider a vertical column of the Earth’s atmosphere based on a square of area 1 m^2. This air column has a mass of 1.01×10^4...

# A rod of flint glass when immersed in carbon disulfide becomes almost invisible. It is said that it is because both have same refractive index. What I don’t understand is just because they both have same refractive index, why does it become invisible?

A low temperature flame that melts carbon?? I saw this on television the other day. I have no idea how it works. It sound promising but so have a lot of other things in the past. There is a clickable news video in the link. http://freeenergynews.com/Directory/RhodesGas/index.html

Hello, I'm just wondering, is it fine to predict the age of fossils older than 10,000 years with Carbon Datin? After all, I think nobody knows how much carbon-14 there was back then, and whether the animals consumed less or more carbon-14 than now. How exact are such long-term predictions?

Does anyone know the difference? Specs and such? Thanks

We know that http://en.wikipedia.org/wiki/Pyrolytic_carbon" layers will have an omni directional cleavage and possibly an omni directional Diamagnetic field. Also, could a http://www.ebteccorp.com/lasercut.html" cut such a thin sheet of Pyrolytic carbon to transparent thickness, If not then...

This is supposed to be an easy question, but I appear to be slightly lost. Can anyone give me a hint on what to do here? when waves of wavelength lamda are diffracted by a circular disc of diameter D the first minimum in the intensity of the scattered waves occurs at a scattering angle z...

Me and a friend are having alittle argument about whether arsenic which kills carbon based life forms would kill silicon based lifeforms. I think it still would kill silicon based lifeforms but he thinks it won't, can someone please help me. Thank you

what is your knowledge about carbon ions? is there a machine that determines its creature?

the question a mummy contain 9.2 g of carbon and it has an activity of 1.6 Bq. how old is the specimen in years? i worked out the question and got an answer of 2300 yrs, the closest answer in the book is 2200yrs. is my answer of 2300 yrs correct?

hi all! Are composites like carbon fibres (CFRP) the best material for flywheel? There is no doubt on its high strength to density ratio. Regarding the safety consideration, is flywheel made of composites safer than that made of other materials? I've read through some articles claiming that...

hi all! Are composites like carbon fibres (CFRP) the best material for flywheel? There is no doubt on its high strength to density ratio. Regarding the safety consideration, is flywheel made of composites safer than that made of other materials? I've read through some articles claiming that...

Hello. I need a help again for my differential equations class. The problem is as follows: The air in a room whose volume is 10,000 cu ft tests 0.15% carbon dioxide. Starting at t=0, outside air testing 0.05% carbon dioxide is admitted at the rate of 5000 cu ft/min. (a) What is the...

I am starting to learn how to make carbon fiber products i am not sure about what type of resin/epoxy? to use does the resin/epoxy give it that nice exterior? or is something else needed? any suggestions in general would be much appreciated thank you

What could those two things have in common? Vela-X exploded some 11,000 years ago. How do we know that 11,000 years, was it carbon dated somehow? Because if so then the calibrated date to calendar years would have been 13,000 years. Could that have caused a significant increase in cosmogenic...

The hydrogen liberated at the cathode would coat the electrode so polarises the cell. And manganse (IV) oxide is used as a depolariser. I got an equation in my notes: 2MnO2 + 3H2 --> 2MHO(OH) + 2H2O. But evidently the oxygen doesn't balance. I tried looking on the internet but still no...

Ques: If 6g of pure carbon is completely burned, what mass of carbon must be burned to furnish 39.3 kj of heat? For this ques, the equation would be C + O_2 \xrightarrow~ C O_2 well, iam stuck after this

Hey all Why does Silicon Dioxide have a Giant molecular structure, while Carbon dioxide is made of simple molecules? They both have 4 electrons on their valence shells, so why wouldn't Silicon Dioxide be a simple linear molecule? (gaseous).

Hi All, I was reading about carbon nanotubes on wikipedia and they seem to be a pretty interesting development. Wikipedia indicates that they are using in producting better electron guns, and I was wondering if anyone knew how they are being used to do so. My unserstanding of current...

carbon filament in a light bulb does obey the ohm's law right?

Hi! Is silicon inert? i.e. can I clean it from deposited films with e.g. HNO3 and H2SO4 without etching the silicon itself? What about amorphous carbon?

Hey there. I was browsing a motorcycle forum and stumbled upon a particular place where the moderator was in the process of selling his own manufactured "carbon fiber kits". Naturally I asked him if the people who designed those replacement parts had any engineering background, and if he had...

(I'm not a material engineer so I apologize if any part of this post is idiotic.) The main problem with carbon nanotubes is the difficulty with growing them long enough to be of any use. After doing some research, I found a site about carbon nanotube rings. So it got me thinking, why not...

Cubane is a hydrocarbon with the formula, C8H8. It has a cubic shape, as its name implies, with a carbon atom at each corner of the cube. This molecule is very unstable and some researchers have been seriously injured when crystals of the compound exploded while being scooped out of a...

Im looking to have several gas powered scooter parts made in carbon fiber from a cad file. Such things as steering pole, rims, deck, air scoop, and a distant goal of a frame. scooters in question www.goped.com. I understand some basics of carbon fiber, but pretty much just what you can learn...

Is it possible to maintain pure carbon gas at room temperature? Suppose I start with a vacuum chamber and allow a small amount of hot, gaseous carbon vapor inside it, but only enough so that it remains gaseous at normal room temperatures - is that possible to do? Where can I find formulas to let...

:cry: Does anyone know the resistivity of pure carbon??I’m doing a coursework n am stuck :cry: ..please help…loadsa lovin,G :blushing:

Lets say for example a hydrocarbon skeleton has two diff functional groups branched to the skeleton.. Let's say one of the functional groups pH is less than 9 to 10, and the other functional group's pH is greater than 2 to 4 that means that molecule to be electrically charged, the pH of the...

What is the mass (in grams) of 6.022 x 10^6 atoms Carbon 12? I am given the equation 1 amu=1.6606 x 10^-24 g, but I'm not sure if I should be using this in my conversion factor or not. Can anyone tell me how to set this up? I have a few ideas but unfortunately I don't have any way to check my...

Pipeline To Space? A carbon nano tube pipeline from the Equator to geo. orbit could pump massive amounts of H2 and O2 to space to be stored as rocket fuel. The pipeline would only have to be 1/4 inch diameter. http://www.newmars.com/cgi-bin/ikon...;f=5;t=198;st=0

I'm looking for information on the maximum possible strength of SWNTs. What effect do thermodynamically inevitable(over macro scale lengths) lattice faults have on the tensile and compressive strength of the tubes? What effect does tube chirality and diameter have on tensile and compressive...

can anyone please provide me all the excited levels of Carbon 12 upto 22.6 MeV at least with jpi descriptions? Thanks in advance.

A proton of mass m undergoes a head-on elastic collision with a stationary carbon nucleus of mass 12×m. The initial velocity of the proton is 790 m/s in the positive x direction. Find the velocity of the center of mass of the system. I am really confused as to how to find the 'velocity of...

We did an experiment in chemistry class today, where we had to see whether certain substances dissolved in water conducted electrcity. For this we put carbon electrodes in the liquid and connected them, but that's not important. My question is, how did the carbon conduct the electricity? From...

http://www.eurekalert.org/pub_releases/2004-09/uoaf-asf092404.php