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1987 In Science
The year 1987 in science and technology involved many significant events, some listed below. Astronomy * February 23 – Supernova 1987a is observed, the first "naked-eye" supernova since 1604. * Asteroid 7816 Hanoi is discovered by Masahiro Koishikawa. * 10500 Nishi-koen is discovered. Biochemistry * December – Yoshizumi Ishino discovers the DNA sequence of CRISPR. * Piotr Chomczynski and Nicoletta Sacchi publish their acid guanidinium thiocyanate-phenol-chloroform extraction protocol. Computing * Larry Wall releases the first version of the Perl programming language via the comp.sources.misc newsgroup. * HyperCard is released by Apple Inc., an early example of hypermedia which inspires the World Wide Web. * Thomas Knoll and John Knoll develop the first version of Photoshop. Genetics * November 6 – Florida rapist Tommy Lee Andrews is the first person to be convicted as a result of DNA fingerprinting. History of science * Robert V. Bruce publishes '' The Launching of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apple Inc
Apple Inc. is an American multinational corporation and technology company headquartered in Cupertino, California, in Silicon Valley. It is best known for its consumer electronics, software, and services. Founded in 1976 as Apple Computer Company by Steve Jobs, Steve Wozniak and Ronald Wayne, the company was incorporated by Jobs and Wozniak as Apple Computer, Inc. the following year. It was renamed Apple Inc. in 2007 as the company had expanded its focus from computers to consumer electronics. Apple is the largest technology company by revenue, with billion in the 2024 fiscal year. The company was founded to produce and market Wozniak's Apple I personal computer. Its second computer, the Apple II, became a best seller as one of the first mass-produced microcomputers. Apple introduced the Lisa in 1983 and the Macintosh in 1984, as some of the first computers to use a graphical user interface and a mouse. By 1985, internal company problems led to Jobs leavin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Self-organized Criticality
Self-organized criticality (SOC) is a property of dynamical systems that have a critical point as an attractor. Their macroscopic behavior thus displays the spatial or temporal scale-invariance characteristic of the critical point of a phase transition, but without the need to tune control parameters to a precise value, because the system, effectively, tunes itself as it evolves towards criticality. The concept was put forward by Per Bak, Chao Tang and Kurt Wiesenfeld ("BTW") in a paper , following an earlier paper by Jonathan Katz published in 1987 in ''Physical Review Letters'', and is considered to be one of the mechanisms by which complexity arises in nature. Its concepts have been applied across fields as diverse as geophysics, physical cosmology, evolutionary biology and ecology, bio-inspired computing and optimization (mathematics), economics, quantum gravity, sociology, solar physics, plasma physics, neurobiology and others. SOC is typically observed in slowl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dynamical System
In mathematics, a dynamical system is a system in which a Function (mathematics), function describes the time dependence of a Point (geometry), point in an ambient space, such as in a parametric curve. Examples include the mathematical models that describe the swinging of a clock pendulum, fluid dynamics, the flow of water in a pipe, the Brownian motion, random motion of particles in the air, and population dynamics, the number of fish each springtime in a lake. The most general definition unifies several concepts in mathematics such as ordinary differential equations and ergodic theory by allowing different choices of the space and how time is measured. Time can be measured by integers, by real number, real or complex numbers or can be a more general algebraic object, losing the memory of its physical origin, and the space may be a manifold or simply a Set (mathematics), set, without the need of a Differentiability, smooth space-time structure defined on it. At any given time, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Abelian Sandpile Model
The Abelian sandpile model (ASM) is the more popular name of the original Bak–Tang–Wiesenfeld model (BTW). The BTW model was the first discovered example of a dynamical system displaying self-organized criticality. It was introduced by Per Bak, Chao Tang and Kurt Wiesenfeld in a 1987 paper. Three years later Deepak Dhar discovered that the BTW sandpile model follows abelian dynamics, and therefore referred to this model as the Abelian sandpile model. The model is a cellular automaton. In its original formulation, each site on a finite grid has an associated value that corresponds to the slope of the pile. This slope builds up as "grains of sand" (or "chips") are randomly placed onto the pile, until the slope exceeds a specific threshold value at which time that site collapses transferring sand into the adjacent sites, increasing their slope. Bak, Tang, and Wiesenfeld considered process of successive random placement of sand grains on the grid; each such placement of s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gödel's Ontological Proof
Gödel's ontological proof is a formal argument by the mathematician Kurt Gödel (1906–1978) for the existence of God. The argument is in a line of development that goes back to Anselm of Canterbury (1033–1109). St. Anselm's ontological argument, in its most succinct form, is as follows: "God, by definition, is that for which no greater can be conceived. God exists in the understanding. If God exists in the understanding, we could imagine Him to be greater by existing in reality. Therefore, God must exist." A more elaborate version was given by Gottfried Leibniz (1646–1716); this is the version that Gödel studied and attempted to clarify with his ontological argument. The argument uses modal logic, which deals with statements about what is ''necessarily'' true or ''possibly'' true. From the axioms that a property can only be positive if not-having-it is not positive, and that properties implied by a positive property must all also be themselves positive, it concludes that (s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Launching Of Modern American Science, 1846–1876
''The Launching of Modern American Science, 1846–1876'' is a 1987 nonfiction book by American historian Robert V. Bruce, published by Knopf. The book is a social history Social history, often called history from below, is a field of history that looks at the lived experience of the past. Historians who write social history are called social historians. Social history came to prominence in the 1960s, spreading f ... chronicling a three-decade period in American science. It won the 1988 Pulitzer Prize for History. References 1987 non-fiction books Pulitzer Prize for History–winning works History books about the United States Books about the history of science Alfred A. Knopf books {{science-hist-book-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Robert V
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Robert V may refer to: * Robert V, Count of Dreux * Robert de Brus, 5th Lord of Annandale Robert V de Brus (Robert de Brus), 5th Lord of Annandale, Dumfries and Galloway, Annandale (ca. 1215 – 31 March or 3 May 1295), was a feudal lord, justice and constable of Kingdom of Scotland, Scotland and Kingdom of England, England, a regent ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DNA Fingerprinting
DNA profiling (also called DNA fingerprinting and genetic fingerprinting) is the process of determining an individual's deoxyribonucleic acid (DNA) characteristics. DNA analysis intended to identify a species, rather than an individual, is called DNA barcoding. DNA profiling is a forensic technique in criminal investigations, comparing criminal suspects' profiles to DNA evidence so as to assess the likelihood of their involvement in the crime. It is also used in paternity testing, to establish immigration eligibility, and in genealogical and medical research. DNA profiling has also been used in the study of animal and plant populations in the fields of zoology, botany, and agriculture. Background Starting in the mid 1970s, scientific advances allowed the use of DNA as a material for the identification of an individual. The first patent covering the direct use of DNA variation for forensicsUS5593832A was filed by Jeffrey Glassberg in 1983, based upon work he had done while ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rape
Rape is a type of sexual assault involving sexual intercourse, or other forms of sexual penetration, carried out against a person without consent. The act may be carried out by physical force, coercion, abuse of authority, or against a person who is incapable of giving valid consent, such as one who is unconscious, incapacitated, has an intellectual disability, or is below the legal age of consent ( statutory rape). The term ''rape'' is sometimes casually used interchangeably with the term ''sexual assault''. The rate of reporting, prosecuting and convicting for rape varies between jurisdictions. Internationally, the incidence of rapes recorded by the police during 2008 ranged, per 100,000 people, from 0.2 in Azerbaijan to 92.9 in Botswana with 6.3 in Lithuania as the median. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Photoshop
Adobe Photoshop is a raster graphics editor developed and published by Adobe for Windows and macOS. It was created in 1987 by Thomas and John Knoll. It is the most used tool for professional digital art, especially in raster graphics editing, and its name has become genericised as a verb (e.g. "to photoshop an image", " photoshopping", and " photoshop contest") although Adobe disapproves of such use. Photoshop can edit and compose raster images in multiple layers and supports masks, alpha compositing and several color models. Photoshop uses its own PSD and PSB file formats to support these features. In addition to raster graphics, Photoshop has limited abilities to edit or render text and vector graphics (especially through clipping path for the latter), as well as 3D graphics and video. Its feature set can be expanded by plug-ins; programs developed and distributed independently of Photoshop that run inside it and offer new or enhanced features. Photoshop's naming sch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Knoll
John Knoll (born October 6, 1962) is an American visual effects supervisor and chief creative officer (CCO) at Industrial Light & Magic (ILM). One of the original creators of Adobe Photoshop (along with his brother, Thomas Knoll), he has also worked as visual effects supervisor on the ''Star Wars'' prequels and the 1997 special editions of the original trilogy. He also served as ILM's visual effects supervisor for '' Star Trek Generations'' and '' Star Trek: First Contact'', as well as the '' Pirates of the Caribbean'' series. Along with Hal Hickel, Charles Gibson and Allen Hall, Knoll and the trio's work on '' Pirates of the Caribbean: Dead Man's Chest'' earned them the Academy Award for Best Visual Effects. Knoll has been praised by directors James Cameron, Gore Verbinski, Guillermo del Toro, and Brad Bird. Del Toro, who worked with Knoll for the first time on '' Pacific Rim'', stated "He basically has the heart of a kid and the mind of a scientist, and that's a great ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
