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1991 In Science
The year 1991 in science and technology involved many significant events, some listed below. Astronomy and space exploration * May 18 – Helen Sharman becomes the first British person in space, flying with the Soyuz TM-12 mission. * October 29 – The ''Galileo'' probe becomes the first spacecraft to visit an asteroid (951 Gaspra). * Steven Balbus and John F. Hawley publish their insights on magnetorotational instability. * Asteroid 6859 Datemasamune is discovered by Masahiro Koishikawa. * Asteroid 11514 Tsunenaga is discovered by Masahiro Koishikawa. * There are four lunar eclipses: three penumbral on January 30, July 26, and June 27, and one minor partial lunar eclipse on December 21. * There are two solar eclipses: one annular eclipse on January 15, and a very long total eclipse on July 11 (lasting 6 minutes and 53 seconds). Chemistry * Carbon nanotubes discovered in the insoluble material of arc-burned graphite rods by Sumio Iijima of NEC. Computer science * Fe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helen Sharman
Helen Patricia Sharman, CMG, OBE, HonFRSC (born 30 May 1963) is a British chemist and cosmonaut who became the first British person, first Western European woman and first privately funded woman in space, as well as the first woman to visit the ''Mir'' space station, in May 1991. Early life and education Sharman was born in Grenoside, Sheffield, where she attended Grenoside Junior and Infant School, later moving to Greenhill. After studying at Jordanthorpe Comprehensive, she obtained a BSc degree in chemistry at the University of Sheffield in 1984 and a PhD degree from Birkbeck, the University of London in 1987. She worked as a research and development technologist for GEC in London and later as a chemist for Mars dealing with the flavouring properties of chocolate. This later led the UK press to label her "The Girl from Mars". Project Juno After responding to a radio advertisement asking for applicants to be the first British space explorer, Helen Sharman was s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
December 1991 Lunar Eclipse
A partial lunar eclipse took place on Saturday, December 21, 1991, the last of four lunar eclipses in 1991. The moon grazed the northern edge of the umbral shadow. It occurred near perigee, and as described, such event was known as a supermoon. Visibility This small partial eclipse was visible from North America, eastern Asia, Australia, and western South America. Related eclipses Eclipses of 1991 * An annular solar eclipse on January 15. * A penumbral lunar eclipse on January 30. * A penumbral lunar eclipse on June 27. * A total solar eclipse on July 11. * A penumbral lunar eclipse on July 26. * A partial lunar eclipse on December 21. Lunar year series Metonic cycles (19 years) Half-Saros cycle A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, ''The half-saros'' This lunar eclipse is related to two partial solar eclipses of Solar Saros 122 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nicola Pellow
Nicola Pellow is an English mathematician and information scientist who was one of the nineteen members of the ''WWW Project'' at CERN working with Tim Berners-Lee. She joined the project in November 1990, while an undergraduate maths student enrolled on a sandwich course at Leicester Polytechnic (now De Montfort University). Pellow recalled having little experience with programming languages, "... apart from using a bit of Pascal and FORTRAN as part of my degree course." Almost immediately after Berners-Lee completed the WorldWideWeb web browser for the NeXT platform Pellow was tasked with creating a browser using her recently acquired skills in the C programming language. The outcome was that she wrote the first generic Line Mode Browser that could run on non-NeXT systems. The WWW team began to improve on her work, creating several experimental versions. Pellow was involved in porting the browser to different types of computers. She left CERN at the end of August 1991 but r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HTML Editor
An HTML editor is a program for editing HTML, the markup of a web page. Although the HTML markup in a web page can be controlled with any text editor, specialized HTML editors can offer convenience and added functionality. For example, many HTML editors handle not only HTML, but also related technologies such as CSS, XML and JavaScript or ECMAScript. In some cases they also manage communication with remote web servers via FTP and WebDAV, and version control systems such as Subversion or Git. Many word processing, graphic design and page layout programs that are not dedicated to web design, such as Microsoft Word or Quark XPress, also have the ability to function as HTML editors. Types of editors There are two main varieties of HTML editors: text and WYSIWYG (what you see is what you get) editors. Text editors Text editors intended for use with HTML usually provide at least syntax highlighting. Some editors additionally feature templates, toolbars and keyboard shortcuts to qui ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WYSIWYG
In computing, WYSIWYG ( ), an acronym for What You See Is What You Get, is a system in which editing software allows content to be edited in a form that resembles its appearance when printed or displayed as a finished product, such as a printed document, web page, or slide presentation. WYSIWYG implies a user interface that allows the user to view something very similar to the end result while the document is being created. In general, WYSIWYG implies the ability to directly manipulate the layout of a document without having to type or remember names of layout commands. History Before the adoption of WYSIWYG techniques, text appeared in editors using the system standard typeface and style with little indication of layout ( margins, spacing, etc.). Users were required to enter special non-printing ''control codes'' (now referred to as markup ''code tags'') to indicate that some text should be in boldface, italics, or a different typeface or size. In this environment there was very ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Web Browser
A web browser is application software for accessing websites. When a user requests a web page from a particular website, the browser retrieves its files from a web server and then displays the page on the user's screen. Browsers are used on a range of devices, including desktops, laptops, tablets, and smartphones. In 2020, an estimated 4.9 billion people used a browser. The most used browser is Google Chrome, with a 65% global market share on all devices, followed by Safari with 18%. A web browser is not the same thing as a search engine, though the two are often confused. A search engine is a website that provides links to other websites. However, to connect to a website's server and display its web pages, a user must have a web browser installed. In some technical contexts, browsers are referred to as user agents. Function The purpose of a web browser is to fetch content from the World Wide Web or from local storage and display it on a user's device. This process ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WorldWideWeb
WorldWideWeb (later renamed Nexus to avoid confusion between the software and the World Wide Web) is the first web browser and web page editor. It was discontinued in 1994. It was the first WYSIWYG HTML editor. The source code was released into the public domain on 30 April 1993. Some of the code still resides on Tim Berners-Lee's NeXT Computer in the CERN museum and has not been recovered due to the computer's status as a historical artifact. To coincide with the 20th anniversary of the research center giving the web to the world, a project began in 2013 at CERN to preserve this original hardware and software associated with the birth of the Web. History Tim Berners-Lee wrote what would become known as WorldWideWeb on a NeXT Computer during the second half of 1990, while working for CERN, a European nuclear research agency. The first edition was completed "some time before" 25 December 1990, according to Berners-Lee, after two months of development. The browser was announce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tim Berners-Lee
Sir Timothy John Berners-Lee (born 8 June 1955), also known as TimBL, is an English computer scientist best known as the inventor of the World Wide Web. He is a Professorial Fellow of Computer Science at the University of Oxford and a professor at the Massachusetts Institute of Technology (MIT). Berners-Lee proposed an information management system on 12 March 1989, then implemented the first successful communication between a Hypertext Transfer Protocol (HTTP) client and server via the Internet in mid-November. Berners-Lee is the director of the World Wide Web Consortium (W3C), which oversees the continued development of the Web. He co-founded (with his then wife-to-be Rosemary Leith) the World Wide Web Foundation. He is a senior researcher and holder of the 3Com founder's chair at the MIT Computer Science and Artificial Intelligence Laboratory (CSAIL). He is a director of the Web Science Research Initiative (WSRI) and a member of the advisory board of the MIT Center for Co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nature (journal)
''Nature'' is a British weekly scientific journal founded and based in London, England. As a multidisciplinary publication, ''Nature'' features peer-reviewed research from a variety of academic disciplines, mainly in science and technology. It has core editorial offices across the United States, continental Europe, and Asia under the international scientific publishing company Springer Nature. ''Nature'' was one of the world's most cited scientific journals by the Science Edition of the 2019 ''Journal Citation Reports'' (with an ascribed impact factor of 42.778), making it one of the world's most-read and most prestigious academic journals. , it claimed an online readership of about three million unique readers per month. Founded in autumn 1869, ''Nature'' was first circulated by Norman Lockyer and Alexander Macmillan as a public forum for scientific innovations. The mid-20th century facilitated an editorial expansion for the journal; ''Nature'' redoubled its efforts in exp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sumio Iijima
is a Japanese physicist and inventor, often cited as the inventor of carbon nanotubes. Although carbon nanotubes had been observed prior to his "invention", Iijima's 1991 paper generated unprecedented interest in the carbon nanostructures and has since fueled intense research in the area of nanotechnology. Born in Saitama Prefecture in 1939, Iijima graduated with a Bachelor of Engineering degree in 1963 from the University of Electro-Communications, Tokyo. He received a Master's degree in 1965 and completed his Ph.D. in solid-state physics in 1968, both at Tohoku University in Sendai. Between 1970 and 1982 he performed research with crystalline materials and high-resolution electron microscopy at Arizona State University. He visited the University of Cambridge during 1979 to perform studies on carbon materials. He worked for the Research Development Corporation of Japan from 1982 to 1987, studying ultra-fine particles, after which he joined NEC Corporation where he is still ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carbon Nanotube
A scanning tunneling microscopy image of a single-walled carbon nanotube Rotating single-walled zigzag carbon nanotube A carbon nanotube (CNT) is a tube made of carbon with diameters typically measured in nanometers. ''Single-wall carbon nanotubes'' (''SWCNTs'') are one of the allotropes of carbon, intermediate between fullerene cages and flat graphene, with diameters in the range of a nanometre. Although not made this way, single-wall carbon nanotubes can be idealized as cutouts from a two-dimensional Hexagonal tiling, hexagonal lattice of carbon atoms rolled up along one of the Bravais lattice vectors of the hexagonal lattice to form a hollow cylinder. In this construction, periodic boundary conditions are imposed over the length of this roll-up vector to yield a helical lattice of seamlessly bonded carbon atoms on the cylinder surface. ''Multi-wall carbon nanotubes'' (''MWCNTs'') consisting of nested single-wall carbon nanotubes weakly bound together by van der Waals ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
