Information Definition and 999 Threads

I am currently a student at USF majoring in Computer Science. I am almost positive that I will be switching to Information Technology after this semester. This is primarily because I do not want a job in software development anymore. I still have 43 credits left to complete the CS program. I...

Hi everyone, I apologize if I've placed this in the wrong section. I don't know if anyone will be able to help me with this, but after an exhaustive search of the net, I can't seem to find my answer. There is a university physics textbook that my local public library once had in circulation...

An image is created due to the interaction of photons. The images we see from things like stars and galaxies were created in the past, and are observed at a later time due to the speed of light. In this sense a photon carries information which can be transformed into an image with the correct...

I have a project about High Frequency Dielectrics and I am searching everywhere but nothing found. Please I need your help to find some information that would help me in my project.

Homework Statement This is the information and calculations I have been given, but am not sure it is correct. Please verify. An object in the form of a cube with sides of 50 cm is immersed in water. Determine the height of immersed object, knowing that the density of water is 1000 kg/m^3 and...

I know that the relativistic effects really do happen, such as time dilation and length contraction. However both frames of references predict these effects in the other frame of reference. It is said that these effects really happen in both of them, due to relativity of simultaneity. The thing...

I'm only a Junior in High-School, but I know my passion resides in the field of Engineering. I love Trigonometry, Algebra, Chemistry. Whether or not i fail in some areas, and succeed in others, i always come out enjoying a process of learning in those areas. Chemical Engineering in a more...

Hello, we are learning about single balanced and double balanced modulators. Apparently single balanced modulators include an information, upper and lower sideband component while double balanced modulators use only the upper and lower sideband components. Can someone please tell me why the...

http://lanl.arxiv.org/abs/1203.5719 Abstract: We study a self-consistent solution of the semi-classical Einstein equation including the back reaction from the Hawking radiation. Our geometry is constructed by connecting flat space and the outgoing Vaidya metric at the locus of the shock...

Information Theory - Shannon's "Self-Information" units Hi, I'm familiar with information and coding theory, and do know that the units of Shannon information content (-log_2(P(A))) are "bits". Where "bit" is a "binary digit", or a "storage device that has two stable states". But, can...

URGENT need Information about statics class offered online?? I need to find a university or comm. college that will be offering statics online over the summer. If you have any ideas of schools i could call please list them. Thanks!

Below are two excellent papers that outline the mechanism by which astrocytes regulate synaptic strength. The first one shows the most important pathway, I think. Here's my summary of the story from the first paper: 1) ATP released locally by local activity (either from the granule neurons...

Hi everyone. Homework Statement We are given N spins 1/2. A rotation is defined as \rho_\theta=e^{-i\theta J_n}\rho_\theta e^{i\theta J_n} on an Hilbert Space H, with J_n=n_xJ_x+n_yJ_y+n_zJ_z\:,\quad n_x^2+n_y^2+n_z^2=1, and \theta isn't related to any observable. Given a quantum state...

I've recently found myself conducting large numbers of tests on nanoscale devices in a liquid. The device themselves are an insulated silicon wire, with an electrochemically active tip. The circuit in which they are placed can be described as follows, though my notation is most likely...

any one have good information about thin films

Hello, I would like someone to suggest me a good book on entropy and information theory. I need something that explains these subjects intuitively, rather than all mathematics. I have fairly strong knowledge of mathematics behind entropy, but all is kind of scrambled what is what...

I've always wanted to study something that has to do with how information is processed in the brain. I don't know if this sounds silly but almost like "reading" the brain. Perhaps like data/mathematical modelling? I don't really know what educational path I must choose. I am thinking that the...

I do not know if this is the right place for this post, but if I am doing a mistake by putting it here, If it is so, please let me know where is the right place to put it. So, I am learning Information Theory, this is first approach and I would like to know a few names of good books for...

from my understanding from an observer in the universe, your information is plastered on the event horizon, and ultimately retrieved when the event horizon shrinks to the schwartschild radius and the singularity explodes. please coreect me if I am wrong on that. if the singularity does not...

I may have figured out a way to do that, unless there is some fundamental principle I am not currently aware of. I should preface this by saying that I am not an expert. I have only recently decided to major in physics, and have not even begun school. But I just had a eureka moment. It works by...

does the fact that there is a limit on how much can be observed on electrons location and momentum have anything to do with the finiteness and conservation of information? is the total momentum plus location of an electron unknown to us or is it also unknown to the universe? meaning, does...

First of all sorry if this is the wrong section! For a physics assignment, I am given a graph of which I am to gather data from. Graph 1: In an experiment to investigate how the celcius temperature, T, affects the volume, V, of an enclosed sample of air at a constant pressure, a students...

Hi! As I understand it, Quantum Information Theory is an attempt to apply the Classical Information Theory (i.e 0's and 1's) into the Quantum realm of superpositions. I recently came across a fascinating interpretation of QIT wherein it was described as possibly the law that effectively...

Hey folks, so the extent of my knowledge in math is basic concepts from Calc I (I'm more of a programmer). Now, I was working on a 2D particle system and had a random thought: if I wanted to gauge the total amount of information contained in the system, how would I do it? The first idea I had...

Hello PF! (Not sure this is in the right section.) I've learned very little about maths/physics in school, but went back to uni last year to do maths. Physics is still a bit of an alien territory, but nevertheless I like exploring it in my own amateur way. One of the things that started...

Homework Statement A decorative light fixture in an elevator consists of a 2.0 kg light suspended by a cable from the ceiling of the elevator. From this light, a separate presses the emergency stop button. During the stop, the upper cable snaps. The elevator engineer says that the cable could...

hi i seem to be finding it difficult to understand the legal terminology and understand what I am actually reading, i work in an industry that requires me to wear ear protection, protective footwear and eye protection. The Ear protection is provided and meets all Health and safety criteria...

Hello, Say I have a system with a spatial part and a spin degree of freedom, hence the wavefunction generally looks like \psi_+(\textbf r) |+\rangle + \psi_-(\textbf r) |- \rangle w.r.t. for example the z-axis. Now what if I'm simply interested in the spatial part? Can I perform an...

hi, i was wondering, for a black hole, as everyone knows,the escape velocity is greater than light. this means that the information about the existence of the black hole in terms of light never reaches the observer. so if the black hole were the cease to exist at an instant of time, the...

I am an undergraduate student and full-time Emergency Medical Technician and I am trying to obtain a few basic measurements requiring the use of an accelerometer. What I require is a device that can measure acceleration of two directions, such as forward to rear acceleration and side to side...

How to understand "fisher information"? Hello, I am trying to understand what "fisher information is." It is defined as V [∂/∂∅(lnf(X,∅)) ]=E[ (∂/∂∅[lnf(X,∅)])^2 ]. From Wikipedia: Can you please help me understand why this is the case? How can this be explained by looking at the...

Infrared radiation, of wavelength λair = 1um in air, travels through a dispersive medium with refractive index n = 1.4505 and with dn/dλair = -0.01 per um at this wavelength. Calculate the speed at which the radiation carries information. So know that c/n = λf radiation carries...

Homework Statement A wave traveling through a block of glass has a magnetic field of the for B(z,t0 = BI sin(2x10^15t - 2x10^10z) What information can you extract from the equation above Homework Equations well ω=2∏f k = 2∏/λ v=ω/λ n = c/v The Attempt at a Solution I know can find...

Hi, I am a student in Europe. I have been reading through the posts on Graduate schools and the essays like the one by Zapper on how to become a physicist. I am now in the stage of searching for a PhD position. 1. I would like to know what you guys think about the scope of Quantum...

Hello there. I'm a 4th year computer engineering student who is just at the end of an Information theory class. It was nice, I thought I got a grip on all the concepts and so... But, I tried to explain to my girlfriend today the basics of information theory, and I failed to do so. The...

Hello, I am a french 15 aged boy and I have been loving science, engineering, physics for 3 years now. I inform myself on the internet and I learn bunch of things at school but I feel like I haven't learned enough, and I'd like to know where I could learn all the physics bases from my class...

They (physicists) say that information can't be lost and I heard Susskind saying that he thought information of objects going into a black hole was stored in the outside of the black hole while the material was sucked in. I thought information was almost like a fossil, where an imprint of an...

Homework Statement I'm working on some proofs involving equivalent definitions of an equidistributed sequence. I need some resources to learn about equidistribution. Any links or book titles would be greatly appreciated. Homework Equations For an equidistributed sequence, \lim_{n\to \infty...

Should prospective employers have access to financial information about prospective employees? Is access to that information useful enough at a level where an individual's rights to privacy should be disregarded? Should employers be allowed to ask for a credit check? It is my assertion that...

Hawking and others suggest that it is a very special deal that macroscopic black holes lose quantum information, but I only partially agree. It is clearly important that they do not preserve most quantum numbers - black holes may be a way to break a lot of conservation laws of particle physics...

A classmate approached me last week (after class) and asked why I ask about things that probably aren't going to be on the exam. I told him that it helps me understand things on a deeper level. He then said, "Do your understanding on your own, because it makes things confusing for the rest of...

For example, after the big bang, the only thing that decides the future is Newtons laws. However, we must take into account quantum effects we cannot be for sure what the future holds. Doesn't the same thing apply with information. How can we know the information about a system if there is...

I was wondering if there is currently a project by some government or NGO, in the same spirit as the Svalbard Global Seed Vault, to digitize all information (history, math/science, literature, etc.) and store it either somewhere safe on the planet or better yet on some other celestial body in...

I would like to know whether it is possible to determine which path information for a photon reflecting from a mirror as shown in the book QED by Feynman page 40 and 43 (or available by googling mirror reflection Feynman or similar) if photons are fired one at a time from the source (unaimed)...

I posted this question on two philosophy sites, but so far I have gotten no meaningful responses, predictably so because I'll admit this is a rather far-our idea. But wherever laws deemed absolute are broken, trying to deduce the explanation from the known and understood is not going to work...

Hello, Can you Prove that information is either increasing or remaining constant with time. Thanks.

Suppose we were to simulate 1D QED on a 1D lattice. How much information do we need at each lattice site given the mass, charge, and spin of the particles (does spin make sense in 1-1D spacetime?)? The links between lattice sites represent the gauge field? How much information is needed at...

If I understand correctly, Hawking Radiation is created when the anti-particle of a virtual particle pair falls into a black hole while the particle of the pair escapes. The anti-particle goes on to annihilate with a particle in the black hole. Is not the annihilated particle identical to the...

hi everybody, :smile: while looking on the mutual information of two variables, one find that it is concave of p(x) given p(x|y) and convex of p(x|y) given p(x). the first statement is okey, but when it comes to proving the second, i get stuck, even when i find proofs already done i...

How do radio waves carry the information? I mean the information is digital: 1 or 0, but what is 1 and what is 0 from perspective of radio waves?