Structures Definition and 324 Threads

"...It is true that down there at heart of the sea, are structures that sometimes have dimensions of several hundreds meters that are unusual, for which we we do not have a simple, direct explanation... " "...rocks appear. Some of them are not typical of Cuba. This leads one to think of two...

Does anybody knows a good reference or book that explains the "fine structure constant"?

Hi all,, I am just about to learn a course on Data structures and algorithms in next semester. Can u guys pls explain me the preoper importance of this course and how should i prepare myself to make full usage of this course and Lastly pls recommend some good books to me. I will be...

Most of the stuff in astronomy is spherically symmetrical, or very nearly so. Stars, galactic cores, and planets all seem to be. I can think of exceptions of such the arrangement of matter in disk like solar systems or the outer portions of spiral galaxies, small irregular asteroids, nebula...

Hello, my name is Kenichi, from japan. Inorder to draw Crystal Lattice 3D Structures, what libraries for free out there to be used with C programming language ? I am still a C novice. I wonder, in chemical simulation research do you also program using C language plus some libraries to...

A few lingering questions... Suppose an interpretation is an assignment of capital letters to declarative sentences. I see that assigning the same letter to more than one sentence limits the usefulness of your interpretation, but is it ever useful or necessary to assign more than one letter...

N types have on more free electron added to its structure from doping an impurity on it. Such as an arsenic impurity onto a pure intrinsic silicon crystalline structure. However wouldn't it having one more electron inside of it that is bound to the arsenic atom make the ntype more resistant...

i was given this task - find at least 2 cities which have a monument of atomic structure and give the name of the element of which the structure is. :confused: for example, there's an atomic structure of iron in Brussels named Atomium http://www.trabel.com/brussel/Brussel-HeyselAtomium.htm...

What would the Lewis structure look like for Cl F? Would it look like this: http://img53.exs.cx/my.php?loc=img53&image=dot8pn.png How do you know when there is a triple bond? ~Thanks

Hey There are two questions asking me to identify the resonance structures for: SO4 two minus and H3PO4 (sorry, I don't know how to do subscripts) Could someone please explain to me how to do these resonance structures? Thanks.

Symmetry in crystal structures- please help! Hi there, I was hoping someone here could help explain a few things about crystal symmetry to me cos it hs me so confused (we've been doing crystals for 2 weeks and things up til now have been ok, I'm just getting myself muddled as usual!). The...

i'm having trouble drawing up some lewis structures related to VSPER theory. i was given 22 Lewis structures to draw and i had problems with these ones... 1 - [N(CHsubscript3)subscript4]^+ 2 - IClsubscript2 3 - [IClsubscript4]^- thanks if anyone can help out with these questions.

http://www.mncs.k12.mn.us/physics/string/string_artistic2.jpg http://www.mncs.k12.mn.us/physics/string/string_index.html

Hello, I have a little function I have written that takes an array of structures as an argument void print_names(struct pers_info arr[]) { printf("Here is person 1: %d %s %s %s\n", arr[0].ssn, arr[0].pers_name.first,arr[0].pers_name.middle, arr[0].pers_name.last); printf("Here...

Hi I've been wondering...there are quite a few folks who would like to post their organic chemistry problems here (including, possibly me, in future). But to do that properly, one must be able to give his/her solution/mechanism/question in the form of structures and not just words as it would...

I would like to ask a question about PNA and Morpholino... I am sorry, I look at their structure images but I still couldn't see anything that can be called similarities. The Morpholino has ring structure which is the same as DNA but PNA has no rings at all... Would you please explain a...

I googled for ocean, plastic, pollution, "Discovery Times", to find something that I saw last night and instead got this...what a coincidence. I assume that this is some crackpot but all considered it seemed worth a post...

Where are uniform gravitating prolate spheriods found? Where are gravitating polyhedra found?

CMB anisotropies are deviations of the temperature of the black body emission mainly (but not only) by photons, which have to climb out gravitational potential of higher density concentrations during recombination epoch and during their spatio-temporal trajectory till now (Sachs-Wolfe effect)...

I have been hearing about this story for some time. I have no idea what to think. It seems to be a step above the typical fringe story so I posted here. http://www.earthfiles.com/news/news.cfm?ID=587&category=Science

anyone know of any good computer programs used to make chemical structures and equations? i know of www.orgsyn.org but it's really a pain in the ass to use. EDIT: fixed the link, there was a comma in the way

Does anyone know whether there are any relationship between the structure of a metal and its position in the periodic table? For example, I know zinc and magnesium have a hexagonal close-packing structure, but is there a reason for it? So how do you know which metal has a hexagonal...

Monolithic and invincible, the Republicans have designed a truly awesome machine. Its engine is Capitalism, lubricated by Fundamentalist Christianity. Americans have not grasped yet the power of this machine, but the World has seen in Iraq the raging power that dominance in space yields. The...

This will be the new version of my "Logic" thread in PF v2.0. I'll get my logic notes pasted into this forum ASAP, along with some of the more useful discussion from the old thread.