Structure Definition and 1000 Threads

For some reason, when I try to use this function it has a problem passing along the fname input. For example, I'd type something like : Field(S, 'names') ------------------------------ This returns an error: ? Reference to non-existent field 'fname'. Error in ==>...

Hello everyone! I have met such a curious thing: When chemists tried to synthesize CaCl by reducing CaCl2 with H2 they got CaClH instead, but the structure of a compound was determined using X-ray structure analysis which is not suitable for determining the position of light elemnts like...

Homework Statement Finding the critical buckling load of a really short column with wide cross section (is it still considered a column?) E = 22 GPa Yield: 300 MPa Load: 28N thickness: 0.226 mm I = 670706.51 mm^4 (is this right?) Load Applied Area (as indicated by white arrows)...

1. Explain how to find a shortest path between any given pair of vertices, given the length of edges connecting the vertices and the shortest distance between vertices (after doing the shortest-path calculation) So I am given a two matrices, as said one with length of edges connecting and the...

Hi this isn't actually a homework question more my own curiosity/confusion. They have the same quark constituents and http://en.wikipedia.org/wiki/File:Baryon_octet.png" for both but mass and decay rate are different, please explain. (if the lambda is an excited state of the sigma why isn't it...

I´m trying to find approx. numbers or formulas for a submarine like structure to mantain a constant volume. For a given volume, which materials and to what thickness should the container be?

hey I was trying to draw some fine structure diagrams like this one but it is too slow and unflexible with normal graphic softwares. Does anyone know a good graphing software *expecifically* designed for atom structure diagrams like the above one? Thanks, valleyman

Hi, I understand that the iodine number is the number of moles of iodine reacting with one mole of fat/oil which indicates the number of double bonds present in the fat/oil molecule. However I am having trouble calculating them. Can someone show me how to solve the following question...

What is the packing fraction for a body centred packed structure?

Hi I have a tutorial problem involving determining the ideal methods for identifying material properties of a layered semiconductor structure. The problem states to use either scanning or transmission electron microscopy. THe structure consists of several monolayers (around 5nm) of AlGaAs...

I have a problem a group consists of following element A,B,C,D,F,G,H,J,K,L,M,N.How can we find the order of elements A,J,N? state the possible orders of the proper subgroups? Here is the group table ... A B C D F G H J K L M N A . C G J M B K A D N F H L B . F H L K A M B N D C G J C ...

Homework Statement Consider the related molecules POF2- and POF3. Choose all the following statements that are correct for both molecules. Homework Equations A) P atom is sp3-hybridised B) The F-P-F bond angle will be approximately 109.5 degrees C) Geometry around he P centre is...

Hi everybody! I'm an italian student, I'm about to get my bachelor in physics, and naturally the next academic year I'm going to begin grad school. My problem is: starting with the fact that I'm with no doubt a theoretical physicist, i'd like to know if, as far as regards career, it will be...

Not sure if this is an easy question or not. The Wikipedia entry on the Big Bang, in its section on "Abundance of primordial elements," cites the 1988 book by Kolb and Turner (The Early Universe), in saying that the ratio of photons to baryons "can be calculated independently from the...

I am a fisheries biologist interested in manipulating a lake level by about six inches via a box cement outlet structure on a small lake. The outlet structure is currently governed by two adjacent 5ft by 0.5ft dam boards,which have historically been removed one at a time in the spring and...

why lot of materials tend to fail in tension rather then compression? please explain using crystall structure of material , suggest some pdf regarding to this topic

I'm actually getting pretty frustrated with this now. It makes no sense. I have this structure defined in detector.h //This structure contains all raw sensor data struct sensor_data { //ADC Values For Each Sensor int ADC_LOuter; //Outer Left Sensor int ADC_LInner; //Inner Left Sensor...

I have a function for my robot that reads multiple IR sensors, and I get a syntax error on the bolded lines. //Performs An ADC Reading On All RLS Channels //Reads left to right void ADC_All(void) { //Reads Left Outer Sensor SetChanADC(RLS_LOuter); ConvertADC(); while(BusyADC())...

Hi, Halzen and Martin, on page 18 of their book, describe the resolution of hadron structure using virtual photons obtained by annihilating e+ and e- beams. In Figure 1.11(b), isn't the positron arrow shown wrongly? It seems to be moving forward in time. (Or maybe I'm just being picky...

I have been asked to solve the structure in the diagram below where the arcs radius is R, and the force acting is P my question is whether this structure is at all stable?? surely the middle leg cannot resist and moment about about the joint at its top end and will fall (it only has a...

Is this another statically indeterminate structure? (urgent) Homework Statement [PLAIN]http://1.bp.blogspot.com/__d7SU8yZ6pk/S4JApel7HdI/AAAAAAAAAKo/NhmSNIOxNik/s1600-h/IBq4.jpghttp://1.bp.blogspot.com/__d7SU8yZ6pk/S4JApel7HdI/AAAAAAAAAKo/NhmSNIOxNik/s1600-h/IBq4.jpg Homework Equations...

how to calculate the sparameters of a coplanar stripline structure with 434microns breath 45microns height and 1950microns length fed with 1Win TE10 mode at 35GHz... can some one help me regards..

Hi, all, I want to calculate the band structure and there is example such like that: BandLinesScale pi/a %block BandLines # These are comments 1 0.000 0.000 0.000 \Gamma # Begin at Gamma 50 2.000 0.000 0.000 X # 25 points from Gamma to X 20 2.000...

Since pure dark matter apparently does not have charge but has mass, might it be found in the galaxy's edge as something akin to uncharged black holes? Typically, pure dark matter is invoked as particles. Wouldn't they form aggregations under gravity? Extended (i.e., not particulate) dark...

I plan on building shelving using 3/4" pipe and fittings. The general design is a 2 shelf system -180 degrees from each other around a center pole at different heights. I plan on bolting the center pole to a plywood base. Each shelf will hold between 5 and 100 lbs. I want to make sure its...

I was just wondering what the physical interpretation is of 'fine structure effects'? (where alpha is the fine structure constant).

How is fascicle arrangement linked to muscle structure? Does anyone know where I can get videos on fascicles? Thanks

In short, if we consider the group of symmetries of a regular octahedron, we see (or at least, the author of "Groups, Graphs and Trees" saw...) that the group is isomoprhic to Z2\otimesZ2\otimesZ2\otimesS3 - particularly since if we break up the vertices into 3 groups of front-back, top-bottom...

What is the difference between levels of protein structure ( Primary , Secondary , Motifis , Tertiary , Domain and Quaternary )

Problem For Structure of Nuclei -- Enigmatic ! Question :- calculate the distance of closest apprach for a head on collision between 5.30Mev alpha particle and nucleus of a copper atom? Answer The distance of closest approach is given by...

Hi, just a basic question , what are the main methods of determining the structure of a solid in order to test its genuinety i.e. gold... if i were to be given a piece of gold, how would i check that it is genuine gold? could i use x ray diffraction (If so what measurements /tests would i...

Homework Statement The problem is this. We have a structure (see the attached image) and need to make freebodies of all of the members. 150 lbs are applied to the platform being lowered by the strings. We also need to figure internal stresses, but I think I can get those if I can understand...

Could someone explain the relationship between the FSC and the Planck Scale? What are they in relation to each other. I know what the Planck Scale is, and I even have a loose understanding of the FSC, but what of them in contrast and comparison? And how does the FSC affect QM, if at all...

Hi everyone! I wanted to ask if in your opinion is it right to say that band structure calculations (and hartree fock calculations) could live in a framework of the fermi liquid theory where quasiparticles are one-electron states (which could be or not could be the case)...

I don’t understand what our teacher means by this: " Analyze the correctness (or lack of it) of a common approximation made in structural design, which is that the weight of the structure can often be neglected when calculating the loads carried by the members in the structure."

a question in Lewis structure? [FONT="Comic Sans MS"]I know that Lewis structure is so easy to discuss ..but I have this compound : [SIZE="4"]SnCl2 when I drew the Lewis structure of its , I had to make Double bond between the Cl & Sn ..but a teacher told me once that when the Cl is not the...

i study from some books that the properties of a materials depends on the structure of it, while the structure depends on how it being process..may i know what structure actually it means? i can't get its meaning..does it means the processing methods will influnce whether the materials will be...

Homework Statement Please tell me about NMOS and PMOS, What are their Structure and Application Homework Equations The Attempt at a Solution

hey, how can ı show the reflections over the line do not have group structure? --reflection of the real plane ------

1. Homework Statement Using the powder XRD data below, show that the substance has a face centred cubic structure. (xray lamda = 0.154056 nm) Peak No.------2(theta) 1 -------------38.06 2 -------------44.24 3 -------------64.34 4 -------------68.77 5 -------------73.07 2...

Homework Statement Using the powder XRD data below, show that the substance has a face centred cubic structure. (xray lamda = 0.154056 nm) Peak No.------2(theta) 1 -------------38.06 2 -------------44.24 3 -------------64.34 4 -------------68.77 5 -------------73.07 Homework...

I was asked to draw the resonance structure of nitrous oxide and given some bond length. So i need to eliminate non-probable resonance structure for nitrous oxide. I was able to draw three structure but how do we use the bond length to liminate non-probable resonance structure for nitrous oxide?

Alright. Um. We have 4 sheets of newspaper and 1 meter of masking tape. We have to design a structure to catch four eggs dropped one after another from a point at a height of 6 ft. What do you guys think? We've tried making just a simple 'basket' filled with crumpled paper and it doesn't...

Would the structure of Dinitroacetylene be... NO2-C(triple bond)C-NO2? If the triple bond makes it prone to exploding then woud something like NO2-O-C(triple bond)C-O-NO2 be even more explosive?

Homework Statement It commonly happens that the hyperfine structure in a transition is dominated by the contribution of an s-electron in one of the levels. What property of s-electrons could be responsible for this? A transition of this kind occurs at 494nm in singly ionised 133Cs between a...

Modal realism! 1. All mathematical structure exist necessarily. 2. Our universe/multiverse is a mathematical structure. ------------------------------------------------------- A) Our universe/multiverse exist necessarily. Consciousness 1'. All mathematical structure exist...

Hi all, I was struggling in solving this question which is a part of a practice exam, and I need you to be patient with me and teach me step by step how to figure out the structure and how to read and analyze the spectra. I attached the two 1H NMR & IR spectra so you will be able to know...

Ok as the title suggests I want to clear up my misunderstandings on protein structure. 1. When they say primary,secondary,tertiary and quarternary structure do they mean different stages of a protein. What I mean is do all proteins have a tertiary or quarternary structure and are...

I'm interested in calculating (followed by optimizing) the uniformity of a magnetic field generated by an array of neodymium magnets. Let us assume we have an array of neodymium bar magnets, -each with a constant depth (10mm) and height (2300mm). -Multiple segments (with alternating poles)...

I was reading Hodges' Model Theory when I came across this question in the first chapter: Specify a structure of cardinality w2 which has a substructure of cardinality w but no substructure of cardinality w1. (Working in ZFC) I am assuming w2 means 2w1 but I'm not sure. I haven't really...