Combustion, or burning, is a high-temperature exothermic redox chemical reaction between a fuel and an oxidant atmospheric oxygen, that produces oxidized gaseous products, in a mixture termed as smoke. Combustion in a fire produces a flame, the heat produced can make combustion self-sustaining. Combustion is a complicated sequence of elementary radical reactions. Solid fuels, such as wood and coal, first undergo endothermic pyrolysis to produce gaseous fuels whose combustion supplies the heat required to produce more of them. Combustion is hot enough that incandescent light in the form of either glowing or a flame is produced. A simple example can be seen in the combustion of hydrogen and oxygen into water vapor, a reaction used to fuel rocket engines; this reaction releases 242 kJ/mol of heat and reduces the enthalpy accordingly: 2H2 + O2 → 2H2OCombustion of an organic fuel in air is always exothermic because the double bond in O2 is much weaker than other double bonds or pairs of single bonds, therefore the formation of the stronger bonds in the combustion products CO2 and H2O results in the release of energy.
The bond energies in the fuel play only a minor role, since they are similar to those in the combustion products. The heat of combustion is -418 kJ per mole of O2 used up in the combustion reaction, can be estimated from the elemental composition of the fuel. Uncatalyzed combustion in air requires high temperatures. Complete combustion is stoichiometric with respect to the fuel, where there is no remaining fuel, ideally, no remaining oxidant. Thermodynamically, the chemical equilibrium of combustion in air is overwhelmingly on the side of the products. However, complete combustion is impossible to achieve, since the chemical equilibrium is not reached, or may contain unburnt products such as carbon monoxide and carbon. Thus, the produced smoke is toxic and contains unburned or oxidized products. Any combustion at high temperatures in atmospheric air, 78 percent nitrogen, will create small amounts of several nitrogen oxides referred to as NO x, since the combustion of nitrogen is thermodynamically favored at high, but not low temperatures.
Since combustion is clean, flue gas cleaning or catalytic converters may be required by law. Fires occur ignited by lightning strikes or by volcanic products. Combustion was the first controlled chemical reaction discovered by humans, in the form of campfires and bonfires, continues to be the main method to produce energy for humanity; the fuel is carbon, hydrocarbons or more complicated mixtures such as wood that contains oxidized hydrocarbons. The thermal energy produced from combustion of either fossil fuels such as coal or oil, or from renewable fuels such as firewood, is harvested for diverse uses such as cooking, production of electricity or industrial or domestic heating. Combustion is currently the only reaction used to power rockets. Combustion is used to destroy waste, both nonhazardous and hazardous. Oxidants for combustion have high oxidation potential and include atmospheric or pure oxygen, fluorine, chlorine trifluoride, nitrous oxide and nitric acid. For instance, hydrogen burns in chlorine to form hydrogen chloride with the liberation of heat and light characteristic of combustion.
Although not catalyzed, combustion can be catalyzed by platinum or vanadium, as in the contact process. In complete combustion, the reactant burns in oxygen, produces a limited number of products; when a hydrocarbon burns in oxygen, the reaction will yield carbon dioxide and water. When elements are burned, the products are the most common oxides. Carbon will yield carbon dioxide, sulfur will yield sulfur dioxide, iron will yield iron oxide. Nitrogen is not considered to be a combustible substance when oxygen is the oxidant, but small amounts of various nitrogen oxides form when the air is the oxidant. Combustion is not favorable to the maximum degree of oxidation, it can be temperature-dependent. For example, sulfur trioxide is not produced quantitatively by the combustion of sulfur. NOx species appear in significant amounts above about 2,800 °F, more is produced at higher temperatures; the amount of NOx is a function of oxygen excess. In most industrial applications and in fires, air is the source of oxygen.
In the air, each mole of oxygen is mixed with 3.71 mol of nitrogen. Nitrogen does not take part in combustion, but at high temperatures some nitrogen will be converted to NOx. On the other hand, when there is insufficient oxygen to combust the fuel, some fuel carbon is converted to carbon monoxide and some of the hydrogen remains unreacted. A more complete set of equations for the combustion of a hydrocarbon in the air, requires an additional calculation for the distribution of oxygen between the carbon and hydrogen in the fuel; the amount of air required for complete combustion to take place is known as theoretical air. However, in practice, the air used is 2-3x. Incomplete combustion will occur when there is not enough oxygen to allow the fuel to react to produce carbon dioxide and water, it happens when the combustion is quenched by a heat sink, such as a solid surface or flame trap. Same as complete combustion, water is produced by incomplete combustion. However, carbon monoxide, and/or hydroxide are the products in
Integrated Authority File
The Integrated Authority File or GND is an international authority file for the organisation of personal names, subject headings and corporate bodies from catalogues. It is used for documentation in libraries and also by archives and museums; the GND is managed by the German National Library in cooperation with various regional library networks in German-speaking Europe and other partners. The GND falls under the Creative Commons Zero licence; the GND specification provides a hierarchy of high-level entities and sub-classes, useful in library classification, an approach to unambiguous identification of single elements. It comprises an ontology intended for knowledge representation in the semantic web, available in the RDF format; the Integrated Authority File became operational in April 2012 and integrates the content of the following authority files, which have since been discontinued: Name Authority File Corporate Bodies Authority File Subject Headings Authority File Uniform Title File of the Deutsches Musikarchiv At the time of its introduction on 5 April 2012, the GND held 9,493,860 files, including 2,650,000 personalised names.
There are seven main types of GND entities: LIBRIS Virtual International Authority File Information pages about the GND from the German National Library Search via OGND Bereitstellung des ersten GND-Grundbestandes DNB, 19 April 2012 From Authority Control to Linked Authority Data Presentation given by Reinhold Heuvelmann to the ALA MARC Formats Interest Group, June 2012
Brooklyn is the most populous borough of New York City, with an estimated 2,648,771 residents in 2017. Named after the Dutch village of Breukelen, it borders the borough of Queens at the western end of Long Island. Brooklyn has several bridge and tunnel connections to the borough of Manhattan across the East River, the Verrazzano-Narrows Bridge connects Staten Island. Since 1896, Brooklyn has been coterminous with Kings County, the most populous county in the U. S. state of New York and the second-most densely populated county in the United States, after New York County. With a land area of 71 square miles and water area of 26 square miles, Kings County is New York state's fourth-smallest county by land area and third-smallest by total area, though it is the second-largest among the city's five boroughs. Today, if each borough were ranked as a city, Brooklyn would rank as the third-most populous in the U. S. after Los Angeles and Chicago. Brooklyn was an independent incorporated city until January 1, 1898, after a long political campaign and public relations battle during the 1890s, according to the new Municipal Charter of "Greater New York", Brooklyn was consolidated with the other cities and counties to form the modern City of New York, surrounding the Upper New York Bay with five constituent boroughs.
The borough continues, however. Many Brooklyn neighborhoods are ethnic enclaves. Brooklyn's official motto, displayed on the Borough seal and flag, is Eendraght Maeckt Maght, which translates from early modern Dutch as "Unity makes strength". In the first decades of the 21st century, Brooklyn has experienced a renaissance as an avant garde destination for hipsters, with concomitant gentrification, dramatic house price increases, a decrease in housing affordability. Since the 2010s, Brooklyn has evolved into a thriving hub of entrepreneurship and high technology startup firms, of postmodern art and design; the name Brooklyn is derived from the original Dutch colonial name Breuckelen, meaning marshland. Established in 1646, the name first appeared in print in 1663; the Dutch colonists named it after the scenic town of Netherlands. Over the past two millennia, the name of the ancient town in Holland has been Bracola, Brocckede, Brocklandia, Broikelen and Breukelen; the New Amsterdam settlement of Breuckelen went through many spelling variations, including Breucklyn, Brucklyn, Brookland, Brockland and Brookline/Brook-line.
There have been so many variations of the name. The final name of Brooklyn, however, is the most accurate to its meaning; the history of European settlement in Brooklyn spans more than 350 years. The settlement began in the 17th century as the small Dutch-founded town of "Breuckelen" on the East River shore of Long Island, grew to be a sizeable city in the 19th century, was consolidated in 1898 with New York City, the remaining rural areas of Kings County, the rural areas of Queens and Staten Island, to form the modern City of New York; the etymology of Breuckelen may be directly from the dialect word Breuckelen meaning buckle or from the Plattdeutsch Brücken meaning bridge. The Dutch were the first Europeans to settle Long Island's western edge, largely inhabited by the Lenape, an Algonquian-speaking American Indian tribe who are referred to in colonial documents by a variation of the place name "Canarsie". Bands were associated with place names, but the colonists thought their names represented different tribes.
The Breuckelen settlement was named after Breukelen in the Netherlands. The Dutch West India Company lost little time in chartering the six original parishes: Gravesend: in 1645, settled under Dutch patent by English followers of Anabaptist Lady Deborah Moody, named for's-Gravenzande, Netherlands, or Gravesend, England Brooklyn Heights: as Breuckelen in 1646, after the town now spelled Breukelen, Netherlands. Breuckelen was located along Fulton Street between Smith Street. Brooklyn Heights, or Clover Hill, is where the village Brooklyn was founded in 1816. Flatlands: as Nieuw Amersfoort in 1647 Flatbush: as Midwout in 1652 Nieuw Utrecht: in 1657, after the city of Utrecht, Netherlands Bushwick: as Boswijck in 1661 The colony's capital of New Amsterdam, across the East River, obtained its charter in 1653 than the village of Brooklyn; the neighborhood of Marine Park was home to North America's first tide mill. It was built by the Dutch, the foundation can be seen today, but the area was not formally settled as a town.
Many incidents and documents relating to this period are in Gabriel Furman's 1824 compilation. What is Brooklyn today left Dutch hands after the final English conquest of New Netherland in 1664, a prelude to the Second Anglo–Dutch War. New Netherland was taken in a naval action, the conquerors renamed their prize in honor of the overall English naval commander, Duke of York, brother of the monarch King Charles II of England and future king himself as King James II of England and James VII of Scotland; the English reorganized the six old Dutch towns on southwestern Long Island as Kings County on November 1, 1683, one of the "original twelve counties" established in New York Pro
Aerospace engineering is the primary field of engineering concerned with the development of aircraft and spacecraft. It has two major and overlapping branches: astronautical engineering. Avionics engineering deals with the electronics side of aerospace engineering. Aeronautical engineering was the original term for the field; as flight technology advanced to include craft operating in outer space, the broader term "aerospace engineering" has come into common use. Aerospace engineering the astronautics branch is colloquially referred to as "rocket science". Flight vehicles are subjected to demanding conditions such as those caused by changes in atmospheric pressure and temperature, with structural loads applied upon vehicle components, they are the products of various technological and engineering disciplines including aerodynamics, avionics, materials science, structural analysis and manufacturing. The interaction between these technologies is known as aerospace engineering; because of the complexity and number of disciplines involved, aerospace engineering is carried out by teams of engineers, each having their own specialized area of expertise.
The origin of aerospace engineering can be traced back to the aviation pioneers around the late 19th to early 20th centuries, although the work of Sir George Cayley dates from the last decade of the 18th to mid-19th century. One of the most important people in the history of aeronautics, Cayley was a pioneer in aeronautical engineering and is credited as the first person to separate the forces of lift and drag, which are in effect on any flight vehicle. Early knowledge of aeronautical engineering was empirical with some concepts and skills imported from other branches of engineering. Scientists understood some key elements of aerospace engineering, like fluid dynamics, in the 18th century. Many years after the successful flights by the Wright brothers, the 1910s saw the development of aeronautical engineering through the design of World War I military aircraft. Between World Wars I and II, great leaps were made in Aeronautical Engineering; the advent of mainstream civil aviation accelerated this process.
Notable airplanes of this era include the Curtiss JN 4, the Farman F.60 Goliath, Fokker trimotor. Notable military airplanes of this period include the Mitsubishi A6M Zero, the Supermarine Spitfire and the Messerschmitt Bf 109 from Japan, Great Britain, Germany respectively. A significant development in Aerospace engineering came with the first Jet engine-powered airplane, the Messerschmitt Me 262 which entered service in 1944 towards the end of the second World War; the first definition of aerospace engineering appeared in February 1958. The definition considered the Earth's atmosphere and the outer space as a single realm, thereby encompassing both aircraft and spacecraft under a newly coined word aerospace. In response to the USSR launching the first satellite, Sputnik into space on October 4, 1957, U. S. aerospace engineers launched the first American satellite on January 31, 1958. The National Aeronautics and Space Administration was founded in 1958 as a response to the Cold War. In 1969, Apollo 11, the first manned space mission to the moon took place.
It saw three astronauts enter orbit around the Moon, with two, Neil Armstrong and Buzz Aldrin, visiting the lunar surface. The third astronaut, Michael Collins, stayed in orbit to rendezvous with Armstrong and Aldrin after their visit to the lunar surface; some of the elements of aerospace engineering are: Radar cross-section – the study of vehicle signature apparent to Radar remote sensing. Fluid mechanics – the study of fluid flow around objects. Aerodynamics concerning the flow of air over bodies such as wings or through objects such as wind tunnels. Astrodynamics – the study of orbital mechanics including prediction of orbital elements when given a select few variables. While few schools in the United States teach this at the undergraduate level, several have graduate programs covering this topic. Statics and Dynamics – the study of movement, moments in mechanical systems. Mathematics – in particular, differential equations, linear algebra. Electrotechnology – the study of electronics within engineering.
Propulsion – the energy to move a vehicle through the air is provided by internal combustion engines, jet engines and turbomachinery, or rockets. A more recent addition to this module is ion propulsion. Control engineering – the study of mathematical modeling of the dynamic behavior of systems and designing them using feedback signals, so that their dynamic behavior is desirable; this applies to the dynamic behavior of aircraft, propulsion systems, subsystems that exist on aerospace vehicles. Aircraft structures – design of the physical configuration of the craft to withstand the forces encountered during flight. Aerospace engineering aims to keep structures lightweight and low-cost while maintaining structural integrity. Materials science – related to structures, aerospace engineering studies the materials of which the aerospace structures are to be built. New materials with specific properties are invented, or existing ones are modified to improve their performance. Solid mechanics – Closely related to material science is solid mechanics which deals with stress and strain analysis of the components of the vehicle.
Nowadays there are several Finite Element programs such as MSC
Royal Library of the Netherlands
The Royal Library of the Netherlands is based in The Hague and was founded in 1798. The mission of the Royal Library of the Netherlands, as presented on the library's web site, is to provide "access to the knowledge and culture of the past and the present by providing high-quality services for research and cultural experience"; the initiative to found a national library was proposed by representative Albert Jan Verbeek on August 17 1798. The collection would be based on the confiscated book collection of William V; the library was founded as the Nationale Bibliotheek on November 8 of the same year, after a committee of representatives had advised the creation of a national library on the same day. The National Library was only open to members of the Representative Body. King Louis Bonaparte gave the national library its name of the Royal Library in 1806. Napoleon Bonaparte transferred the Royal Library to The Hague as property, while allowing the Imperial Library in Paris to expropriate publications from the Royal Library.
In 1815 King William I of the Netherlands confirmed the name of'Royal Library' by royal resolution. It has been known as the National Library of the Netherlands since 1982, when it opened new quarters; the institution became independent of the state in 1996, although it is financed by the Department of Education and Science. In 2004, the National Library of the Netherlands contained 3,300,000 items, equivalent to 67 kilometers of bookshelves. Most items in the collection are books. There are pieces of "grey literature", where the author, publisher, or date may not be apparent but the document has cultural or intellectual significance; the collection contains the entire literature of the Netherlands, from medieval manuscripts to modern scientific publications. For a publication to be accepted, it must be from a registered Dutch publisher; the collection is accessible for members. Any person aged 16 years or older can become a member. One day passes are available. Requests for material take 30 minutes.
The KB hosts several open access websites, including the "Memory of the Netherlands". List of libraries in the Netherlands European Library Nederlandse Centrale Catalogus Books in the Netherlands Media related to Koninklijke Bibliotheek at Wikimedia Commons Official website
Find a Grave
Find A Grave is a website that allows the public to search and add to an online database of cemetery records. It is owned by Ancestry.com. It receives and uploads digital photographs of headstones from burial sites, taken by unpaid volunteers at cemeteries. Find A Grave posts the photo on its website; the site was created in 1995 by Salt Lake City resident Jim Tipton to support his hobby of visiting the burial sites of famous celebrities. He added an online forum. Find A Grave was launched as a commercial entity in 1998, first as a trade name and incorporated in 2000; the site expanded to include graves of non-celebrities, in order to allow online visitors to pay respect to their deceased relatives or friends. In 2013, Tipton sold Find A Grave to Ancestry.com, saying that the genealogy company had "been linking and driving traffic to the site for several years. Burial information is a wonderful source for people researching their family history." In a September 30, 2013, press release, Ancestry.com officials said they would "launch a new mobile app, improve customer support, introduce an enhanced edit system for submitting updates to memorials, foreign-language support, other site improvements."As of October 2017, Find A Grave contained over 165 million burial records and 75 million photos.
In March 2017, a beta website for a redesigned Find A Grave was launched at gravestage.com. Public feedback was mixed. Sometime between May 29 and July 10 of that year, the beta website was migrated to new.findagrave.com, a new front end for it was deployed at beta.findagrave.com. In November 2017, the new site became the old site was deprecated. On August 20, 2018, the original Find; the website contains listings of graves from around the world. American cemeteries are organized by state and county, many cemetery records contain Google Maps and photographs of the cemeteries and gravesites. Individual grave records may contain dates and places of birth and death, biographical information and plot information and contributor information. Interment listings are added by individuals, genealogical societies, other institutions such as the International Wargraves Photography Project. Contributors must register as members to submit listings, called memorials, on the site; the submitter may transfer management.
Only the current manager of a listing may edit it, although any member may use the site's features to send correction requests to the listing's manager. Managers may add links to other listings of deceased spouses and siblings for genealogical purposes. Any member may add photographs and notations to individual listings. Members may post requests for photos of a specific grave. Although it does not ask permission from immediate family members before uploading the photos, it will remove and take down photos or a URL for a deceased loved one at the request of an immediate family member. Find A Grave maintains lists of memorials of famous persons by their "claim to fame", such as Medal of Honor recipients, religious figures, educators. Find A Grave exercises editorial control over these listings. Canadian Headstones Interment.net United States National Cemetery System's nationwide gravesite locator Random Acts of Genealogical Kindness Tombstone tourist Official website