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Nikolai Pavlovich Petrov
Nikolai Pavlovich Petrov (13 May 1836 – 15 January 1920) was a Russian army professor of mechanics and engineering who is considered one of the founders of tribology or the study of friction and lubrication. He is best known for what is known as Petrov's Law of friction. Petrov was born in an aristocratic family in Novgorod Oblast, Novgorod. He was educated at the Constantine Artillery Academy and the Nicholas Engineering Academy then became an instructor in mathematics. He studied mechanics under M. V. Ostrogradsky and then joined as a professor of applied mechanics at the Nicholas Engineering Academy in 1867. His main work was on the examination of railway vehicles, examining steam engines, and the his main work was on the lubrication of bearings for the wheels. He examined Plain bearing, journal bearings used in the axles of the wheels of railway coaches and identified a relationship on friction in rotating components, the viscosity of lubricants and frictional torque which goe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Petrov Nikolay Pavlovich
Petrov (; masculine) or Petrova (; feminine) may refer to: People *Petrov (surname) *Petrova (surname) *Petrov, code name of Romanian politician Traian Băsescu as informant for Romanian intelligence agencies Places *4785 Petrov, an asteroid (minor planet) *Petrov (crater), a lunar crater *Petrov (Blansko District), a municipality and village in the Czech Republic *Petrov (Hodonín District), a municipality and village in the Czech Republic *Petrov (Prague-West District), a municipality and village in the Czech Republic *Petrov nad Desnou, a municipality and village in the Czech Republic *Petrov, a hill in Brno *Petrov, Russia (Petrova), name of several rural localities in Russia *Petrova, Maramureș, a commune in Romania *Petrová, a village in Slovakia Other *Petrova (moth) See also *Petrov Affair, a Cold War spy scandal in Australia, centered on Soviet diplomat Vladimir Petrov *Petrov's Defence, an opening in chess *Petrof (other) {{Disambig, geo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tribology
Tribology is the science and engineering of interacting surfaces in relative Motion (physics), motion. It includes the study and application of the principles of friction, lubrication and wear. Tribology is highly interdisciplinary, drawing on many academic fields, including physics, chemistry, materials science, mathematics, biology and engineering. People who work in the field of tribology are referred to as ''tribologists''. The fundamental objects of study in tribology are tribosystems, which are physical systems of contacting surfaces. In lubricated tribosystems, contact stress can create tribofilms. Subfields of tribology include biotribology, nanotribology, space tribology and tribotronics. Etymology The word ''tribology'' derives from the Ancient Greek, Greek root τριβ- of the verb , ''wiktionary:tribo-, tribo'', "I rub" in classic Greek, and the suffix ''-logy'' from , ''wiktionary:-logia, -logia'' "study of", "knowledge of". Peter Jost coined the word in 1966, in t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Novgorod Oblast
Novgorod Oblast (russian: Новгоро́дская о́бласть, ''Novgorodskaya oblast'') is a federal subject of Russia (an oblast). Its administrative center is the city of Veliky Novgorod. Some of the oldest Russian cities, including Veliky Novgorod and Staraya Russa, are located in the oblast. The historic monuments of Veliky Novgorod and surroundings have been declared a UNESCO World Heritage Site. Population: 634,111 ( 2010 Census). Geography Novgorod Oblast borders with Leningrad Oblast in the north and in the northwest, Vologda Oblast in the east, Tver Oblast in the southeast and in the south, and Pskov Oblast in the southwest. The western part is a lowland around Lake Ilmen, while the eastern part is a highland (northern spurs of the Valdai Hills). The highest point is Mount Ryzhokha in the Valdai Hills (). In the center of the oblast is Lake Ilmen, one of the largest lakes in Central Russia. The major tributaries of Lake Ilmen are the Msta, which originat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nicholas Engineering Academy
The Saint Petersburg Military Engineering-Technical University (Nikolaevsky) (russian: Санкт-Петербургский Военный инженерно-технический университет, VITU), previously known as the Saint Petersburg Nikolaevsky Engineering Academy, was established in 1810 under Alexander I. The university is situated in the former barracks of the Cavalier-Guard Regiment where the university was founded. Description Military Engineering- Technical University is a higher military educational institution preparing officers of engineering and building specialties for all branches of troops and navy. It is located in Saint Petersburg where the university was founded, near Engineers Castle, Summer Garden, Suvorov Museum, Tauride Palace, and Smolny Convent. Military Engineering-Technical University has six faculties preparing specialists in the following branches: * Military construction, * Military energy resource engineering, * Naval ba ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plain Bearing
A plain bearing, or more commonly sliding contact bearing and slide bearing (in railroading sometimes called a solid bearing, journal bearing, or friction bearing), is the simplest type of bearing, comprising just a bearing surface and no rolling elements. Therefore, the journal (i.e., the part of the shaft in contact with the bearing) slides over the bearing surface. The simplest example of a plain bearing is a shaft rotating in a hole. A simple linear bearing can be a pair of flat surfaces designed to allow motion; e.g., a drawer and the slides it rests on or the ways on the bed of a lathe. Plain bearings, in general, are the least expensive type of bearing. They are also compact and lightweight, and they have a high load-carrying capacity. Design The design of a plain bearing depends on the type of motion the bearing must provide. The three types of motions possible are: * ''Journal'' (''friction'', ''radial'' or ''rotary'') ''bearing'': This is the most common type of p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1836 Births
Events January–March * January 1 – Queen Maria II of Portugal marries Prince Ferdinand Augustus Francis Anthony of Saxe-Coburg-Gotha. * January 5 – Davy Crockett arrives in Texas. * January 12 ** , with Charles Darwin on board, reaches Sydney. ** Will County, Illinois, is formed. * February 8 – London and Greenwich Railway opens its first section, the first railway in London, England. * February 16 – A fire at the Lahaman Theatre in Saint Petersburg kills 126 people."Fires, Great", in ''The Insurance Cyclopeadia: Being an Historical Treasury of Events and Circumstances Connected with the Origin and Progress of Insurance'', Cornelius Walford, ed. (C. and E. Layton, 1876) p76 * February 23 – Texas Revolution: The Battle of the Alamo begins, with an American settler army surrounded by the Mexican Army, under Santa Anna. * February 25 – Samuel Colt receives a United States patent for the Colt revolver, the first revolving barrel multishot firearm. * March 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1920 Deaths
Nineteen or 19 may refer to: * 19 (number), the natural number following 18 and preceding 20 * one of the years 19 BC, AD 19, 1919, 2019 Films * ''19'' (film), a 2001 Japanese film * ''Nineteen'' (film), a 1987 science fiction film Music * 19 (band), a Japanese pop music duo Albums * ''19'' (Adele album), 2008 * ''19'', a 2003 album by Alsou * ''19'', a 2006 album by Evan Yo * ''19'', a 2018 album by MHD * ''19'', one half of the double album ''63/19'' by Kool A.D. * ''Number Nineteen'', a 1971 album by American jazz pianist Mal Waldron * ''XIX'' (EP), a 2019 EP by 1the9 Songs * "19" (song), a 1985 song by British musician Paul Hardcastle. * "Nineteen", a song by Bad4Good from the 1992 album ''Refugee'' * "Nineteen", a song by Karma to Burn from the 2001 album ''Almost Heathen''. * "Nineteen" (song), a 2007 song by American singer Billy Ray Cyrus. * "Nineteen", a song by Tegan and Sara from the 2007 album '' The Con''. * "XIX" (song), a 2014 song by Slipkno ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
