Structure Definition and 1000 Threads

At first I tried solving the problemteh following way: Due to symmetry let the rods connected to the green rod have tension forces in magnitde T1 => mg = 2T1cos(a), where a is half the angle formed by the two rods. From tere I got an expression from the longer rods in the force projected by them...

Homework Statement:: Does Sars-cov-2 Virus have Reverse Transcriptase enzyme for its replication purpose? Relevant Equations:: None I surfed Google for a relevant answer to my query but failed to find one.I just want to confirm whether Sars-cov-2 has the Reverse Transcriptase or...

When we shine an X-ray beam on a crystal, according to Van Laue formulation, for a sharp intensity peak to be observed on the screen there is a specific direction ##\mathbf{\hat{n}}## , in which for all the X-rays with wavelength ##\lambda## and wavevector...

I have been studying overloading [ ]. I understand how it works from the book. I experiment using vector of structure and obviously I can't make it work. I wonder if it is possible to overload [] on vector of structure. Here is what I have and it's not even close to working, what can I do to...

Out of sheer curiosity, would a polymer of the following structure be theoretically possible? Imagine that the "N-methyl" groups are just the bounds of what is shown, and not actual carbon-containing substituents... It doesn't seem to break any elementary bonding rules. However, the C-C bond...

FOOF looks like this: This paper suggests that FOOOF also exists but does not give a structure, although it does state that it's unlikely it takes the F-O-O-O-F structure. "Ignition: An informal history of liquid rocket propellants" claims that this series of compounds, up to FOOOOOOF, can...

Hello! Springs are amazing devices: we take a straight piece of metal wire, we change its shape and get something that can compress or extended a finite length. We could not do that with the straight wire (too difficult to move atoms apart or close to each other in a significant way). Why does...

Hi, I tend to write down questions/thoughts that come to me as I read articles that are interestsing. I'm reading the intro to solution state NMR in a biophysics textbook. Any there any purely theoretical approaches to determine protein structure / dynamics ? The 1 dimensional digital code...

Edit: nevermind, I realized my mistake. Corner atoms don't touch in FCC, so there's just 4 neighbours in each plane which sums to 12.

Hi I have a funky problem I have been working on for over a day, it is supposed to be quite simple, but I have funny result. What the program does is to pick out one of the five records(of structure) stored in the file, modify it and store back into the file in the same position. It supposed to...

Hi, I have a Matlab code for calculating the band structure of graphene nanoribbon which is working fine, but I wanted to convert it to python and I've done it. I guess I made a mistake somewhere because the plot is totally wrong. Could someone check it for me, please?

Hi I am working on Chapter 11 Structure, this is pointer of structure where the structure has a member that is a pointer variable. I just want to run by you guys to make sure my understanding is correct. Below is a program I wrote for verification. It works...BUT I afraid it's like last time...

Precision Microwave Spectroscopy of the Positronium n=2 Fine Structure A nice compact abstract, so I'll just quote it here: Positronium with its two light leptons is the dream of every theorist, that keeps the uncertainties small. The 0.61 MHz experimental uncertainty are the sum of 0.57 MHz...

Dear FEA experts, I'm trying to model the mechanical behavior (static, modal, and buckling analyses) of an underwater floating structure (e.g. submarine capsule or buoy) under hydrostatic pressure by Finite Element Analysis. To obtain feasible results, the structure should be modeled as freely...

Here is the full question. I have already tried to answer the questions and have put a red dot next to the answers I think are right? Here is my working out to get the answers I had above Have I done this question right? Sadly I don't have the answers to check for myself here so I'm...

I'm 3d-printing a part that is 110mm x 40mm (XY-plane). I have to keep it light weight, so I made it thin - 0.6mm (Z direction) and filled the surface with holes to remove as much weight as possible. Then I added a grid of 2,5 mm high "walls" in the XY directions to make it stiffer and a couple...

I have a quesrion about forming the eqaution of moment equilibrium. As shown in the picture at cut 1 there are 2 vertical forces and a bending moment. I expect V=A. If I apply moment equilibrium about the point where the bending moment is, we get that Ay*x = M(1). But how about if I take moment...

an element (we will call it X) got a cofiguration of 1##s^2##2##s^2##2##p^6##3##s^2##s##p^3## what molecule is moste likely to happened between this element and Mg? 1.MgX 2.##Mg_2##X 3.Mg##X_2## 4.##Mg_3## ##X_2## how do i do it?with lewis structure?just check what structure makes the most...

does anyone know who said this: "if a structure can stand for five minutes, then it can last for 500 years?" and what was he talking about?

Nice (french riviera) , Thursday June 20th 2002 ,If a scientist might give a piece of advice :1)- statement : the french scientist Alain Aspect and his team, proved the EPR (Einstein-Podolsky-Rosen) Paradox == a pair of entangled particles, first in contact then propelled into 2 opposite...

Stanislav Podosenov. Space, time and classical fields of bound structures.http://staspodosenov.narod.ru/eng/index.htmDear Colleagues,I want to familiarize you with principally new approach to solve the problems of divergence in the classic electromagnetic and meson field theory. I have published...

Much topics on this forum are denoted for time. This no wonder since essence of time not known hitherto. Basically participants of the forum are prone to consider the time as the fourth dimention in accompaniment to the three spatial dimentions.However some once vaguely feels insolvency of such...

Poll Question:All right, I'm sick of this contraversy between different views of what "time" is. It seems to me that time is a dimension (or, specifically, "coordinate"). Some people seem to think otherwise. As I can't quite understand their views, and I don't want to mis-quote someone, I will...

Can anyone tell me some webs about the details of moon? the structure of moon? Thx!!

The fine structure constant is quite mysterious and has baffled many physicists, mathematicians and anybody else who has been concerned because there are several bizarre numerical coincidences involving the digits 137.http://www.physicspost.com/articles.php?articleId=11admin@physicsforums.comAll...

We are currently studying genetics in my biology class at school. For a couple days we watched a movie entilted, "Race for the Double Helix" (i think). My teacher said it was on A&E a while ago.Anyway, in the movie they mention these people/things:Linus PaulingRosaling FranklinErwin...

Here I offer my look at the structure of time and its some characteristic.The people are carried in everyday life the notion "the time" for indication of the occurring event and round-robin changes to their life and surrounding their world. The current of time is possible to observe on occurring...

I found this link very informative:http://www.cs.wisc.edu/~kovar/hall.html^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^"Because I am a bastard" - Hemingway"It is not that everything is wrong it is that everything is dangerous" - Foucault

I have a theory about how the universe came to be how it is -- with swirling galaxies.1) A big bang happens.2) Either many dense blobs (for lack of a better word) of mass go out in different directions, or a lot of mass grouping go out and then condense into such blobs.3) These blobs have...

Today at Boarders Book Store I was reading Sartre and came across a specific concept that sparked my interest. The concept in itself is nothing special, merely a core existential concept pertaining to the Ego. More or less, one should never say "my consciousness;" rather, one should say "the...

(Reposted). A gravitational black hole abhors a "naked" singularity, but allows it the observable property of charge with E-M field. Similarly, the horizon for "electronic black holes" limits what we may eventually know about the electromagnetic structure of a charged particle.An electronic...

Isnt everything we see and everything we can conclude is relative according to our molecular structure is the sun 93000000 miles away is the color blue really blue.Lets say for ex we meet a being from another planet with a completely diff molecular sturcture he could conclude that the nucleus of...

my physic teacher just asigned an egg drop contest.the only materials we can use are 1400 or less toothpicks and glue. no padding, nopaper just glue and toothpicks.and incremental heights.if it survive 2 meters we go to 3meters and eventually as high as it will go before breaking.I have no clue...

Well known that exist the objects which can have or positive charge or negative charge or have no charge (neutral). Than these objects differ?According to electronic theory positively charged object has a insufficient number of electron, negativly charged object has an excess electrons but...

Another good example of math shaping universe is such object as atom.Where does an atom (and its shape) come from?Suppose you have an electron and a proton with given properties (charge, spin, etc) - which are known. They (e and p) are passing by each other. Why don't electron just falls on a...

Is this the correct lewis structure for CH2O?

The Example 2 at this site ' http://ocw.ump.edu.my/pluginfile.php/1435/mod_resource/content/2/Chapter%205%20%E2%80%93%20Three%20Pinned%20Arch.pdf ' (page 14): It is parabolic hence the equation is y = (x^2)/10. I used the section method between A-D and applied equilibrium of moment to find a...

When modeling stellar structure and formulating equation of states, I've seen various cases where you have to take into account whether the constituent gas of a star is degenerate or not. But how do you determine if the gas is degenerate or not?

Hello, everyone. :) All I could gather is that, if I'm correct, lattices are spans of the column vectors of the matrix within the "LAT()" notation and the X and Y occurrences are unit placeholders (such as the pixel unit (since this is in the context of image processing)). And, as an attempt...

I have observed a layer like structure (made of plasma) in a cold plasma and wonders what causes it. Following image shows the observation.

Basically looking to find out what the maximum amount of load you could put on the center of a structure like this would be, in theory. Top Beam: The top "Beam" of the assembly in the drawing is 3"x 3"x 3/8" square tubing, 112.5" long Supporting Beams: The beams supporting each end of the Top...

There seems be much understanding of the internal structure the Sun for instance its several layers,thecore, the radiative and convections zones, the corona and so forth. What is known about stars that are not like the Sun? I was particularly thinking blue or red super giants.

Why the air splitted at point a of aeroplane wing's cross section meet at point b simulatneously,

A massive rocky material that is connected open-cell, macro-porous at surface, but 'vesicles' shrink to closed-cell then solid as you drill deeper: What's the technical term for such ?? == Writing a SciFi tale, I'm trying to describe a large, alien-ish rock formation. I've a vague recollection...

The problem of interest at the moment is the solution of a simple damped oscillator problem, xddot+2*zeta*wn*xdot+wn^2*x = 0 Everything seems to work fine provided I include the values of zeta and wn inside the function that defines the derivative values. But zeta and wn are actually calculated...

Summary: The Space Between the Nucleus and Electron Shells? What composes the space between an atom's nucleus and its electron shells?

how can I determinate the electronic structure of a multiband system? for example in the case of the superconductor BaFe2As2 , the electronic properties are as known dominated by 5 Fe d states at the fermi energy, so 5 bands cross the Fermi level and form 5 Fermi surface sheets (if we consider...

Hello All, I am designing a robot that has these dimensions, I need to work out the torques around T1 to T6, I am unsure of the best way to do it, ie do I do a net torque calculation around the torque to be found or is there a better way. W1 to W4 = 0.53955 kN W5 = 14.44032 kN W6 to...

Suppose you have a liquid with high potential energy at a height [H] in a first moment. In a second moment, the liquid loses its potential energy (that is converted into kinetic energy) and fall in a cylinder at height [h] .IF the liquid is incompressible what happens with the molecules in the...

Hello, From wikipedia, this is the partition function for a "classical continuous system": This is the pillar of classical statistical physics, but it can be seen as a mere kind of "mathematical transform" . It can be used even without thinking to statistics or temperature. If we focus only...