Systems Definition and 1000 Threads

What are base systems?-MAO

Hi Guys.Ever since I watched the animated movie "Monster Inc" I have been in love with the concept of a particle system. They are such a simple concept, yet so useful in the world of animation, and probably in research as well?I unfortunately never took any computer courses at university, and my...

I'm a "geology" major, working on a M.A., and I was wondering what any of you other earth scientists thought about this touchy topic of "Earth Systems Science?" In my department, we have hard rock geologists working Sr/Nd, zircon dating, AFTA, etc. We also have soft-rock geologists working on...

The number 3.5699.. as it is explained here is when r becomes of infinite cyclic length....." At a bifurcation the system undergoes a massive change in long term behavior. As r is increased, the bifurcations come faster and faster ( look at this as if an accelerating effect) , until finally at...

Since i always encounter the question "how can you prove God exist?" "prove resurrection" etc..............i think it is meaningful to analyse what is the so-called "logical proof", "valid proof", "objective evidence" etc........, that should be doubless in its "process/method" of proving and...

Can anone please explain with an example what tangent vectors and tensors are......ThanksWe dance round in a ring and suppose,but the secret sits in the middle and knows.- Robert Frost

Lastly I need the solutions to:1) A block attached on a spring is oscillating with an initial displacement of 15cm. The stiffness of the spring is 175N/m(a) What is the engery of the system?(b) Wehn the diplacement is 5cm, what is the kinteic energy of the block and the potential energy of the...

Normally we calculate in decimal system {0,1,2,3,4,5,6,7,8,9}. Some individuals in binary system only {0,1}. What if I've set {0,1,3,8,9}?Can I build any algebra on this?And what if base of the number system is rational (0,A=2.34,B=4.68,C=7.02) or even irrational {0,A=pi,B=2.pi,C=3.pi}?Our...

2u + 3v + 3w = 2 + 5v + 7w = 2 6u + 9v + 8w = 5 ##\begin{bmatrix} 2 & 3 & 3 & 2 \\ 0 & 5 & 7 & 2 \\ 6 & 9 & 8 & 5 \end{bmatrix}## We have been asked to use Jordan exchange to solve the above equations. Can someone please explain how to determine the values for r, s for the equations...

Please refer to article in Wikipedia https://en.wikipedia.org/wiki/Galactic_coordinate_system The following questions are related to the galactic coordinate system: Is the galactic center located on the galactic plane? Since our Sun is above the center of the galactic disk, is the galactic...

A problem of an isolated system's velocity in different inertial systems, in special relativity ##\ \ \ \ \ ## In the inertial reference frame ##K##, the velocity of each component of an isolated system in ## x## direction is zero at a certain time. ##\ \ \ \ \ ## The inertial reference frame...

Homework Statement: Figure shows two mutually coupled coils, for which L11= L22 = 3 + 2/3x (mH) L12 = L21 = 1/3x (mH) where x is in meters, (a) If i1 = 5 A dc and i2 = 0, what is the mutual electrical force between the coils at x = 0.01 m? ( b ) If i1 = 5 A dc and the second coil is...

Hi PF! Can anyone help me define a coordinate system for a circular arc that makes a specified angle ##\alpha## with a 90 degree wedge? See picture titled Geo. As an example, a circular arc can be parameterized over a straight line by ##s##, making angle ##\alpha##, via $$\vec T = \left\langle...

In particular I'm studying the paper "Theory of dynamic response functions of periodically modulated physical systems" by Lovesey et al. and "modulated system" are mentioned many times. My thesis advisor recommend to me reed this paper but is very confuse, any reference you can give me in...

Greetings, I'd like to simulate a complex mechanical automaton with lots of gears, cams, levers and springs. Most of the parts are going to be 3D printed except for some metal springs, rods and bearings. I want to make sure everything fits together and works as expected. Here is just a small...

I'm looking for research projects in the study of complex system, meanly applied in social and biology problems. I would be so grateful with the indication of researchers in the theme. Thanks!

Tesla+SpaceX= supersonic VTOL suborbital electric jet? “I have an idea for a vertical takeoff and landing supersonic jet.” — Elon Musk, every time the subject of electric planes comes up, to include almost never using the VTOL abbreviation for some reason that’s probably very unimportant. —...

Does anyone know a good book on master-slave schemes in dynamic systems? I'm on a dynamics book covering oscillators and it kind of glances over the topic and expects me to know it. I've done previous basic dynamics books and haven't seen it in them and checking on the internet I have found very...

Let’s ditch chemical fuel (even like scramjet, aero spike and SABRE) and venture to the future, for only thus we can become a multiplanetary species, and establish a true interplanetary/interstellar transit system. For atmospheric ascent: 1.Fusion reactor (thermal power)+Thermal ramjet...

Consider a 3-body Newtonian system with equal masses such that velocity change at a given time epoch for a single body is given by: I am interpreting that if also change per epoch such that say which means as a component. So body state information propagates in a way that one could...

Hi, I ask for a clarification about the following: consider for instance a 10 x 12 homogeneous linear system and perform Gauss elimination for the first 8 unknowns. Suppose you end up with 5 equations in the remaining 12-8 = 4 unknowns (because in the process of the first 8 unknowns elimination...

A coal fired steam plant takes in feed water at a temperature of 70°C and produces 15 tonnes of steam per hour at a pressure of 60 bar and temperature 400°C. The fuel consumption rate is 1.5 tonnes per hour and the calorific value of the fuel is 40MJkgˉ¹. Determine the power rating of the boiler...

Although I have over the years seen reports about simulations of the the Earth's moon's origin by a variety of possible mechanisms, none of these reports have ever reported the probability of such events. What is a reasonable estimate of the fraction of solar systems that have a planet of a size...

Mass = 0.12kg Initial temp = 500°c = 773K Initial pressure = 0.8 MPa = 800,000 Pa Final volume = 90L R = 287 Jkg^-1K^-1 1) Initial Volume V=mRT/P 0.12 x 287 x 773 / 800,000 = 26,662.12m^3 2) Final Pressure P2 = P1P2^1.2/V2^1.2 800,000 x 26,662.12^1.2 / 90 = 1,816,095,330 Pa = 1,816 MPa 3)...

I've taken on a new job recently where I'm having to maintain an existing application that generates a points profile to drive a CNC machine and part of it projects points from an axial plane (which represents the machine's working axis) onto another plane which (I think) acts as as a...

HiThis is most likely a stupid question, but sometimes I have to ask them... Imagine the following circuit shown in the image below; there is a ground fault in phase A and let's say the fault impedance is zero. Because of this fault; the potential, with respect to ground, of phase A is zero...

Hi All, When dealing with the kinetic theory of gases in thermodynamics, we obtain the result that the mean kinetic energy per atom is (3/2) kT. In considering different samples like 200g of liquid water or a solid cube of lead with one cubic meter, does kT still play an important role in...

HIya.. Lets just say for arguments sake that creating Artificial General Intelligent computers is only a matter of time and then when we do that Super Intelligent Computer systems will not be far behind.. I have seen a lot of talks on-line about the ethics involved and the plausibility of...

I recently came back from a cruise on MS Eurodam. The ship was equipped with two 17.6 MW Azipod propulsion systems. The captain explained a bit about them in a Q&A session, and I researched a bit more because I'm curious as an engineer. I'm sharing it here on PF for the benefit of other...

This is a question arising from the discussion in another thread. It's my understanding that among systems of natural units, the Planck units system sets not only "all three of those to 1", but also does the same with the Coulomb and Boltzmann constants, leaving the elementary charge not...

From here: From here: Peres writes on p.11: And on p.58: Note that Peres says that these issues are not yet fully understood! On p.63, Peres writes: On p.424: And on the next page: The footnote quoted by Peres says: And on p.25, where Peres introduces ensembles, he says (like Gibbs...

Homework Statement Given that ##x=\phi (t)##, ##y=\psi(t)## is a solution to the autonomous system ##\frac{dx}{dt}=F(x,y)##, ##\frac{dy}{dt}=G(x,y)## for ##\alpha < t < \beta##, show that ##x=\Phi(t)=\phi(t-s)##, ##y=\Psi(t)=\psi(t-s)## is a solution for ##\alpha+s<t<\beta+s## for any real...

Hello everyone! I would like to ask a rather comprehensive question. I would appreciate it if you could help me with this. I have started reading a chemistry textbook recently and typically in the first chapter of any basic chemistry course, you come across, measurement, unit conversion, etc...

I saw this question on special relativity on the internet: "A spaceship traveling to Alpha Centauri, at 0.95C it takes 4.5 years to get there as measured on Earth.how long does it seems to the spaceship passengers?" the answer was 1.4 years (Lorentz factor of 3.2). this answer makes no sense...

When I first learned about these subjects, I did what was intuitive to me and treated particles as if they carried potential energy. I would do this similarly for rigid bodies where I would also treat them as a particles with their body's mass at the center of mass. This wasn't helped by...

I am considering a masters in interdisciplinary engineering from Purdue with a concentration in either systems engineering or computational engineering. Is this a waste of my time and money compared to just getting an aerospace masters and taking courses in systems engineering or computational...

I am in my 4th year in a Bachelor of Science Electrical Engineering Technology (BSEET) program that leans toward electrical transmission and distribution. I have had two courses in calculus, so have briefly covered differential equations. Unfortunately, my course curriculum does not cover...

If I define the two dimensional sphere in the usual way, this gives me a metric ##ds^2 = r^2 d\theta^2 + r^2 \sin^2 \theta d\phi^2##. Can I just define a new coordinate system giving a point coordinates ##(\theta', \phi') = (\theta r^2, \phi r^2 \sin^2 \theta)##?. This gives me the metric ##ds^2...

Hi, There is a point that, in my opinion, is not quite emphasized in the context of general relativity. It is the notion of spacetime coordinate systems that from the very foundation of general relativity are assumed to be all on the same footing. Nevertheless I believe each of them has to be...

Is measuring pressure for a compressible fluid system angle dependent?For a compressible fluid, Bernoulli's Law gives us a relation between two points along a closed system. More specifically it gives us the relation between two cross sections belonging to two distinct points in the closed...

Seeking the guidance of the Physics forums gurus, I was told this would be a good question to contribute to the community. Perhaps it will lead to an in-depth discussion of harmonics: Their creation, implications to power quality, and how to mitigate them. I've been looking at some power...

ıs there anyone to solve 8th 9th and 10th problems? It is about transfer function and control systems http://avesis.yildiz.edu.tr/DokumanYetki.aspx?SSNO=33&USER=2813Password= 1234

Hi, if the velocity ratio is equal to the distance traveled by the effort divided by the distance traveled by the load, in a gears and wheels system, do you invert that in the case or gears? Making it number of teeth on driven gear divided by number of teeth on driving gear? Thanks

I am trying to solve problems where I calculate work do to force along paths in cylindrical and spherical coordinates. I can do almost by rote the problems in Cartesian: given a force ##\vec{F} = f(x,y,z)\hat{x} + g(x,y,z)\hat{y}+ h(x,y,z)\hat{z}## I can parametricize my some curve ##\gamma...

Homework Statement The problem is attached. I'm working on the second system with the masses on a linear spring (not the first system). I think I solved part (a), but I'm not sure if I did what it was asking for. I'm not sure exactly what the question means by the... L=.5Tnn-.5Vnn. Namely, I'm...

Homework Statement PROBLEM A: A small cube of mass m slides down a circular path of radius R cut into a large block of mass M. M rests on a table, and both blocks move without friction. The blocks are initially at rest, and m starts from the top of the path. Find the velocity v of the cube as...

Hi there, I am currently doing a project involving cold-plasma technology systems. I am struggling to find papers relating to surface-micro barrier discharge systems, and the difference between those and dielectric barrier discharge systems. Any help would be greatly appreciated, however basic.

Hi everyone. I have followed with interest in the work of physicists who have conducted research in the area of complex systems and nonlinear dynamics. For example, consider researchers such as Mark Newman from the University of Michigan, Jim Crutchfield of USC, or Doyne Farmer and David Wolpert...