article Definition and 359 Threads

Hi, I'm sorry but I'm not sure if I should post it here or in homework section. It's not homework for sure. This Wikipedia article, https://en.wikipedia.org/wiki/Kepler%27s_laws_of_planetary_motion, on Kepler's laws says the following under History section in the last para: Newton was...

This Bloomburg article uses an set of interesting graphics (based on a variety of government data) to display how land is used in the US, usually down to pixels of 250,000 acres.

Is anyone here familiar with the Brittanica.com article on evolution? I was just about to read it but had a quick look at the article history to see if it was by a scientist or just one of the Brittanica editors. It is by a scientist but one who's won the Templeton Prize and written a books...

I found this interesting article on theory work done to create qubit flipflops that can be adjusted via electric fields making them easier to integrate into existing computing systems...

What's wrong with this article on Stonehenge history? http://fortune.com/2018/06/21/stonehenge-builders-used-pythagoras-theorem-centuries-before-birth-experts/

I'm trying to find a good database of absorption or reflection spectra in visible light for pigments. I've found a wonderful database in this article: http://e-conservation.org/issue-2/36-FORS-spectral-database#CSV It's almost exactly what I needed Except I don't understand the data The...

I took a stab at simplifying Special Relativity, but I want to be 100% sure I'm not butchering physics in the process. Anybody care to weigh in on that? Here is a draft of my Medium article: https://medium.com/@philipkd/special-relativity-explained-with-a-deck-of-cards-f99bfd873bd5 Thanks, - Phil

I was reading an article about holographic principle and M-cosmology and how could they be used to interpret QM mechanics. But there's a part where it talks about holographic principle in a strange way to me. What does this article mean with this?: "Since for the participant observer the...

Hey Guys, Trying to figure out how to replicate the following from an article, but can not understand their notations; The main points are: The bounce action can be written as the equation $$\left( n^2 \Theta^2 + 2\alpha n\Theta -1\right)R_n = 2 \sum_{m=1}^\infty R_{n+m}R_m + \sum_{m=1}^n...

I came across this article about using Pandas in Python to read in a multi-tab spreadsheet to Python, and work with the data then write back to an Excel spreadsheet...

I just wanted to get this out of my system. I'm not talking about the main article on SM but the mathematical formulation one: https://en.wikipedia.org/wiki/Standard_Model_(mathematical_formulation) Very, very hard to find good summarized material on SM out there. It's either good coverage but...

In another thread Peter Donis mentioned there may be a way to define energy properly GR. I always thought it highly problematical because you don't have time transnational symmetry so Nother can be applied. John Baez wrote an interesting article about it...

Interesting Article in Nature and looks like better news (as opposed to doom and gloom) things may not be as bad as previously predicted. It will be interesting to follow further research as we gain more data and produce more accurate climate predictions. Unfortunately, the article itself is...

Hi, I found this rather interesting article on gravity and the zero point energy. Here is the link and abstract Abstract When Planck introduced the 1/2 hv term to his 1911 black body equation he showed that there is a residual energy remaining at zero degree K after all thermal energy ceased...

dear physicts I am searching about a journal to submit my article my article contains a big table (3 column and 3000 rows) I found: Atomic Data and Nuclear Data Tables Nuclear Data Sheets but Impact Factor of these two journals are low (about 2) I want a same journal but by High Impact...

Higgs-Thomson-Fibonacci generation of lepton and quark masses By Gerald Rosen Drexel University, Philadelphia, Pennsylvania 19104 Hadronic Journal; Journal Volume: 19; Journal Issue: 1; : Feb 1996, pages 95-100 OSTI Identifier: 471531

I am new to Latex and looking for a specific journal article template. I am working on a mac and just downloaded the MacTeX-2017 Distribution which come with its editor. When writing an article in Latex, do figures always need to placed in a separate folder? The article journal template I...

Hi, This looked interesting. Determinant and Linear-Algebraic aspects of Sudoku puzzles: http://www.student.montefiore.ulg.ac.be/~merciadri/docs/papers/sudoku.pdf

I have found this engaging biography on Stephen Hawking. Interesting information: https://www.space.com/15923-stephen-hawking.html

Hello. Discussion in another thread lead me to the view of this interesting article on the past and future technological advances of humans. https://ourworldindata.org/technological-progress/ also: https://ourworldindata.org/technology-adoption/ Thanks for taking time to read it.

The Wall Street Journal is definitely interested in space debris - dead satellites, boosters, etc. - as they've run a number of stories on this topic over the past few years. E.g. Wikipedia has a link to a story from 2009 as one of the footnotes to their article on space debris, plus a web...

https://www.theguardian.com/science/2017/aug/24/mathematical-secrets-of-ancient-tablet-unlocked-after-nearly-a-century-of-study <Moderator's note: link corrected, Article intro added>

Hi. I'm reading an article about QCD phase diagram. https://arxiv.org/abs/1005.4814. I want to derive eq(20), but I don't know how. Does anyone know how to derive this?

Hello i need to recreate these chebychev coefficents given the initial value of X_0=1.853 as shown in the photo bellow. i have tried to follow the iterrative algorithm shown in the photo bellow. please help me understand where did i go wrong? thanks

http://www.sciencemag.org/careers/2017/06/gres-dont-predict-grad-school-success-what-does To me these results are in no way surprising; although I do wonder if you would see a difference if you compared theory vs experimental PhDs; I''ve come across some students that were clearly very clever...

I came across this article on the shape of a photon https://cosmosmagazine.com/physics/what-shape-is-a-photon However, the first image confused me, is it showing the wave function? Most other questions regarding what a photon "looks" like seemed to dismiss the question.

I would like to discuss here some points from the article Martin Swaczyna Several examples of nonholonomic mechanical systems Communications in Mathematics, Vol. 19 (2011), No. 1, 27--56 This article is available at https://eudml.org/doc/196963 Let us open page 37: This is a classical problem...

From time to time I come across some text in a Wikipedia article that is quite misleading to a naive reader. The following is an example: https://en.wikipedia.org/wiki/Friedmann_equations The problem is that the sign of Ω0,k is backwards. That is the sign is positive for a universe with...

Does negative mass have the same affect on spacetime as "positive?" mass with respect to gravity? Just read a BBC article that says peeps are playing with negative mass fluid...guy says "With negative mass, if you push something, it accelerates toward you," uh what? Also with the "law" that...

I lost all my download articles. One article that has been attached a lot is a QM momentum analysis of a free wave on two slits. It is a great highly readable article for non professionals. I am thinking Bill or Peter Donis quote it a lot. Please, please help me get this article back. I...

An interesting reference article on number formats and bases used in computing: http://www3.ntu.edu.sg/home/ehchua/programming/java/DataRepresentation.html

I am a simple layman, but I hope one of you wizards can help me understand something here. I just read the new article in Wired magazine on the problem of the missing antimatter, a topic I have read about before in several popular books on physics and cosmology, and I have a basic understanding...

This suggests to me that the early universe did not contain as much dark matter. Is this correct? If so it might give a clue what D.M actually is? http://www.space.com/36083-dark-matter-minor-ingredient-of-early-galaxies.html

Here's an interesting article from Quanta magazine: https://www.quantamagazine.org/20170223-bootstrap-geometry-theory-space/ and some backstory: https://en.wikipedia.org/wiki/Bootstrap_model

Hi everyone. I came across the following article on Wired about physicists (or I should say, physics graduates) playing an increasingly prominent role in Silicon Valley, specifically in the field of machine learning/data science...

I read that in some fields the authors of research papers are ordered alphabetically, and therefore having a surname with the letter “A” may give us an advantage since we would be among the first authors (and the first authors get more recognition than the others). Is having a surname which...

Hi I remember reading an article some years back (5?) on a description of energy categorized into either potential or kinetic energy. I think it was an article in "The physics teacher" but can't find it... Anyone remember it? Martin

This is an interesting short article from SIAM news that says the Feynman lectures are wrong about the Faraday cage: https://sinews.siam.org/DetailsPage/TabId/900/ArtMID/2243/ArticleID/757/Surprises-of-the-Faraday-Cage.aspx

Out of curiosity, I was wondering what is required to read and understand this research paper. The person who wrote it was one of my favorite professors. Very demanding, but helpful at the same time. I was an awe watching him lecture. As a result, I chose to major in mathematics. It is more for...

I came across this article, called "Ten Simple Rules for Effective Statistical Practice", and thought it was monumental in its importance for understanding statistics and using it practically, particularly in science. I hope you enjoy it!

https://www.physicsforums.com/insights/a-problem-from-incandescence/ For me, many blank lines where I'm sure there should be something . Latex is just fine everywhere else on PF. Thanks for any help.

I am not an academic but have been asked to write an article about a radio project I did with some local students, it worked pretty neat. The audience is STEM teachers. Needs to be ready in July. Hoping a professional coulg edit it / check it. Haven't started yet.

Epigenomics is the study of the effects of chromatin structure on the function of the included genes. From https://www.wordnik.com/words/epigenomics . Epigenetics is (a) the study of the processes involved in the genetic development of an organism, especially the activation and deactivation of...

So every time I do some research on the internet I run into major problems... like some freaky stuff, and this isn't QM freaky... its just freaky. Anyway while roaming google as ome does I come across a scientific article that is so well writted it had me convinced, it even had another article...

Suppose a NATO country makes a first-strike against a non-NATO country. If that non-NATO country strikes back in an armed attack, is that considered an attack against all NATO countries? In other words, would an armed attack on a NATO country that is a retaliatory strike trigger Article 5...

An article stating Cosmology is in crisis because of our tendency to interpret data to fit our beliefs. Are we guilty of this? http://singularityhub.com/2016/01/09/cosmology-is-in-crisis-but-not-for-the-reason-you-may-think/

Before life got in the way I used to follow this field as a science fan up until the early 90's. Any good review articles for a general readership that can fill the gap in from early 90's till now. I would like to see how a lot of that research progressed and if any applications / devices came...

According to Wikipedia, Cavendish was able to measure a force of 1.74E-7 N or “roughly the weight of a large grain of sand[13] of 0.13 mg” However, with my calculations using m=F/g, where g=9.81m/s/s Gives m=1.74E-7/9.81 = 1.77E-8 kg = 0.0177 mg Which is much less than 0.13 mg Am I missing...

Hi, I have been some time searching information about the flux of momentum in the electromagnetic field. With the help of some members of this forum, I learned that the Maxwell stress tensor was very related with this flux since its divergence plays the same role in the continuity equation for...

Hello there I need help finding articles, journals, blogs, or newspapers relating to General Physics on the topic "One Dimensional Kinematics" P.S. Can you post some links or anything related to the topic Thank you.