background preloader

The Largest Black Holes in the Universe

Java Generics FAQs - Frequently Asked Questions All text and content found at URLs starting with (collectively, "the Java Generics FAQ") are the sole property of Angelika Langer. Copyright @ 2004-2019 by Angelika Langer . All rights reserved. Except as specifically granted below, you may not modify, copy, publish, sell, display, transmit (in any form, or by any means, electronic, mechanical, photocopying, recording, or otherwise), adapt, distribute, store in a retrieval system, create derivative works, or in any other way use or exploit the contents of the Java Generics FAQ, without the prior consent of the author. All rights, titles and interest, including copyrights and other applicable intellectual property rights, in any of the material belongs to the provider of the material. You do not acquire proprietary interest in such materials by accessing them on my web site. In particular, I do NOT grant permission to copy the Java Generics FAQ or any part of it to a public Web server.

Laboratory Equipment What Is a Black Hole? An artist's drawing a black hole named Cygnus X-1. It formed when a large star caved in. This black hole pulls matter from blue star beside it. A black hole is a place in space where gravity pulls so much that even light can not get out. The gravity is so strong because matter has been squeezed into a tiny space. Because no light can get out, people can't see black holes. How Big Are Black Holes? Another kind of black hole is called "stellar." An artist's drawing shows the current view of the Milky Way galaxy. The largest black holes are called "supermassive." How Do Black Holes Form? Stellar black holes are made when the center of a very big star falls in upon itself, or collapses. Scientists think supermassive black holes were made at the same time as the galaxy they are in. This image of the center of the Milky Way galaxy was taken by the Chandra X-ray Observatory. Image Credit: NASA/CXC/MIT/F.K. If Black Holes Are "Black," How Do Scientists Know They Are There? Image Credit:

Multi-Agent Transport Simulation | MATSim Optics, Lasers, Imaging & Fiber Information Resource Black hole A black hole is defined as a region of spacetime from which gravity prevents anything, including light, from escaping.[1] The theory of general relativity predicts that a sufficiently compact mass will deform spacetime to form a black hole.[2] Around a black hole, there is a mathematically defined surface called an event horizon that marks the point of no return. The hole is called "black" because it absorbs all the light that hits the horizon, reflecting nothing, just like a perfect black body in thermodynamics.[3][4] Quantum field theory in curved spacetime predicts that event horizons emit radiation like a black body with a finite temperature. This temperature is inversely proportional to the mass of the black hole, making it difficult to observe this radiation for black holes of stellar mass or greater. Objects whose gravity fields are too strong for light to escape were first considered in the 18th century by John Michell and Pierre-Simon Laplace. History General relativity

Ten 100-year predictions that came true 11 January 2012Last updated at 00:09 By Tom Geoghegan BBC News Magazine John Watkins predicted Americans would be taller, tanks would exist and C, X and Q would no longer feature in our everyday alphabet In 1900, an American civil engineer called John Elfreth Watkins made a number of predictions about what the world would be like in 2000. How did he do? As is customary at the start of a new year, the media have been full of predictions about what may happen in the months ahead. But a much longer forecast made in 1900 by a relatively unknown engineer has been recirculating in the past few days. In December of that year, at the start of the 20th Century, John Elfreth Watkins wrote a piece published on page eight of an American women's magazine, Ladies' Home Journal, entitled What May Happen in the Next Hundred Years. Watkins was a writer for the Journal's sister magazine, the Saturday Evening Post, based in Indianapolis. It was picked up and caused some excitement on Twitter. 1. 2. 3. 4. 5. 6.

The Society of Vacuum Coaters Milky Way (chocolate bar) The Milky Way bar was created in 1923 by Frank C. Mars and originally manufactured in Minneapolis, Minnesota. The name and taste were taken from a famed malted milk drink (milkshake) of the day – not the Earth’s galaxy, as many contend.[1][2] On March 10, 1925, the Milky Way trademark was registered in the U.S., claiming a first-use date of 1922.[3] In 1924, the Milky Way bar was introduced nationally and sold USD800,000 that year. The chocolate for the chocolate coating was supplied by Hershey's.[4] In 1935 the slogan was "The sweet you can eat between meals In 2010, the Milky Way Simply Caramel bar went on sale. In 2012, Milky Way Caramel Apple Minis went on sale as a limited time offering for the Halloween season. The American Milky Way bar contains 260 Calories in each 58 gram bar, while the smaller Milky Way Midnight contains 220 Calories in each 50 gram bar and the Milky Way Simply Caramel bar contains 250 calories in each 54 gram bar.[9] List of chocolate bar brands

Is radix sort faster than quicksort for integer arrays? discussion at reddit There are plenty of misconceptions and confusion over radix sort on the internet. The wikipedia article is messy and unclear, and focuses more on trying to explain the philosophy (for lack of a better word) than the characteristics and capabilities of radix sort. American Flag Sort Worst case performance: O(kN) Worst case space complexity: O(k log N) In Engineering radix sort McIlroy et al. discusses how radix sort can be used successfully to sort arrays of strings, using the American Flag Sort variant. Implementation The implementation proved to be surprisingly simple. “The troubles with radix sort are inimplementation, not in conception” - McIlroy et al. (1993) The complexity is O(kN) with k = 4 for 32-bit integers. It's important to note that complexity analysis of e.g. quicksort assumes that each comparison is O(1), which isn't true in practice on real hardware nor correct in theory when considering variable sized elements. Benchmark sort Hardware: Language options:

Proteomics - LC Sciences – Technologies for Genomics and Proteomics Discoveries Our proteomics products and services include the use of custom synthesized peptide microarrays based on the PepArray™ technology which enables the total customization of content on each individual microarray to suit your needs. The technology allows us to synthesize thousands of custom peptides (sequences can be defined to each single amino acid residue) on an addressable array to act as kinase substrates, antibody epitopes, or protein binding ligands. We can perform enzymatic/binding reactions in a high-throughput format and generate quantitative results in a controllable, enclosed environment with minimal sample usage. Kinase Profiling Microarray Service A comprehensive kinase analysis service utilizing high density protein kinase substrate (PKS) peptide microarrays synthesized on PepArray™ microfluidic chips for proteomic scale kinase profiling, quantitative measurement of kinase kinetic activities in the absence or presence of protein kinase inhibitors, and drug discovery research.

Related: