Recent content by el_hijoeputa

In the stupid quest to know everything about a subject, i just wonder if there exist databases out there that include all the existing journals to search for an specific topic. I currently use Science Direct, but that is restricted only to Elsevier journals. For example, it does not include...

I found a program that does it. DataFit, from http://www.curvefitting.com/ Now I only need to work on the model. Where and what can I read to solve the problem of obtaining the temperature at a distance from a wire with a current passing thru it?

Please tell me if some of you know of a way, or program that I can download or use to fit a given polynomial to a set of data. I have done an experiment in which I varied two currents thru wires (Ix, Iy) and measured the Temperature at a given point (T). The polynomial is known from a model (I...

I think that medicine had created an model of how the human being should be like. Aberrations to what it is consider "normal" or "by the book", like a literally third eye, are removed by surgery and fixed. Our evolution is then slowed or stopped because these mutations are not given a chance.

Is there exist a program that I just give the (x,y,z) coordinates, and the program draw me a 3D ball where I asked. I will use it to draw a crystall consisting of balls. I need the program to help me visualize the structure of a crystal, and to draw a picture of a crystall, and identify the...

Hello. A long time ago there was a post here of all the resources that we can find online for physics. I tried to find it searching a little bit, with no luck. Anyway, if someone know about that post, let me know, What I'm interested in is in a good thermodynamics review (or summary (?))...

Some big matrix, like 4x4 ones, can be written as groups of 2x2 matrices. For example, H = \left(\begin{array}{cccc}1 & 0 & 1 & 0\\0 & 1 & 0 & 1\\1 & 0 & 1 & 0\\0 & 1 & 0 & 1\end{array}\right) = \left(\begin{array}{cc}1 & 1\\1 & 1\end{array}\right) where the 1 in the last matrix represents...

Some briefs, from a recent email (MRS News): New life for nanotubes (Nature Materials Update) Resesarchers have discovered a method for restarting the growth of open-ended carbon nanotubes in a way that preserves the atomic-scale structure of the original tubes. The 'fresh growth' of the...

This might sound silly... I was on a travel, and arrived late at my class of Quantum Mechanics 2. The proffesor was in the middle of a disscusion, and I'm trying to figure what was it. I asked one of my classmates and said he was talking about something with Projection operators. He was...

Your subscription is a student membership? I just want to know if the student membership get the printed magazine and other goodies.

Raman is the #1 Spectroscopy measurement used in diamond research. You gain a lot of information from it, like sp2(graphite or amorphous)/sp3(diamond) carbon composition, the stress on the crystal (by the shift of the diamond peak) and the density of defects on the crystal (by the broadening of...

Recently I took an introductory course on Group Theory applied to chemistry, and learned about symmetry applied to molecular vibrations and how to detemine the detection of the vibrational nodes in IR and Raman Spectroscopy. My interest is to be able to use Infrared spectroscopy to...

Thank you chem_tr, thank you very much for your help.

Thanks Duarh, thank you very much for your help.

Therefore boron will have one 1s three sp2 and only one 2p orbital, and when bonding with thy hydrogen it will leave (from bottom to top in energy) a 1s orbital nonbonding, 3 sigma bonds, a nonbonding pz (for example) and three antibonding?