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Stress–energy tensor

The stress–energy tensor, sometimes called the stress–energy–momentum tensor or the energy–momentum tensor, is a tensor quantity in physics that describes the density and flux of energy and momentum in spacetime, generalizing the stress tensor of Newtonian physics. It is an attribute of matter and non-gravitational force fields; this density and flux of energy and momentum are the sources of the gravitational field in the Einstein field equations of general relativity, just as mass density is the source of such a field in Newtonian gravity. The stress–energy tensor involves the use of superscripted variables. If Cartesian coordinates in SI units are used the components of the position four-vector are given by: x0 = t, x1 = x, x2 = y, x3 = z, where t is time in seconds, x, y, z are distances in meters; the stress–energy tensor is defined as the tensor Tαβ of order two that gives the flux of the αth component of the momentum vector across a surface with constant xβ coordinate. In the theory of relativity, this momentum vector is taken as the four-momentum.

In general relativity, the stress–energy tensor is symmetric, T α β = T β α. In some alternative theories like Einstein–Cartan theory, the stress–energy tensor may not be symmetric because of a nonzero spin tensor, which geometrically corresponds to a nonzero torsion tensor; because the stress–energy tensor is of order two, its components can be displayed in 4 × 4 matrix form: μ, ν = 0, 1, 2, 3 =. In the following, i and k range from 1 through 3; the time–time component is the density of relativistic mass, i.e. the energy density divided by the speed of light squared. Its components have a direct physical interpretation. In the case of a perfect fluid this component is T 00 = ρ, where ρ is the relativistic mass per unit volume, for an electromagnetic field in otherwise empty space this component is T 00 = 1 c 2, where E and B are the electric and magnetic fields, respectively; the flux of relativistic mass across the xi surface is equivalent to the density of the ith component of linear momentum, T 0 i = T i 0.

The components T i k represent flux of ith component of linear momentum across the xk surface. In particular, T i i represents normal stress, called pressure when it is independent of direction; the remaining components T i k i ≠ k. In solid state physics and fluid mechanics, the stress tensor is defined to be the spatial components of the stress–energy tensor in the proper frame of reference. In other words, the stress energy tensor in engineering differs from the relativistic stress–energy tensor by a momentum convective term. Most of this article works with Tμν of the stress -- energy tensor. However, it is necessary to work with the covariant form, T μ ν = T α β g α μ g β ν, or the mixed form, T μ ν = T μ α g α ν, or as a mixed tensor density T μ ν = T μ ν − g. Thi

Kongar-ol Ondar

Kongar-ool Borisovich Ondar was a master Tuvan throat singer and a member of the Great Khural of Tuva. Ondar was born near the Khemchik River in western Tuva. Considered a living treasure by the Republic of Tuva, Ondar was granted a stipend and an apartment for the musical skills he possessed. Jovial and personable, Ondar is the best-known face of khöömei throat singing to Westerners, appearing on the Late Show with David Letterman and in interviews for CNN and other networks. In the Central Asian tradition of self-fulfilling child naming, Kongar-ool translates to "loud boy." Ondar is known outside Tuva for inviting American blues musician Paul Pena to Tuva. Pena, who had learned throat singing before coming to Tuva, was the subject of the documentary Genghis Blues in which Ondar was featured. In 1992, Ondar won an international throat-singing contest, which brought invitations to perform in Europe and the United States. In 1993, he performed at Frank Zappa's eclectic "garden party/soiree" gathering in his last days.

He appears on the Béla Fleck and the Flecktones albums Outbound, album/DVD Live at the Quick, Jingle All the Way. He released one album on Warner Bros. Records titled Back Tuva Future, his first studio album was called Echoes of Tuva, by the TuvaMuch Music label. He died after emergency surgery for a brain hemorrhage in Kyzyl on July 25, 2013, he was 51 years old. Kongar-ol Ondar's homepage Kongar-ol Ondar on IMDb Kongar-ol Ondar at AllMusic Tyvam by Kongar-ol Ondar, Evgeny Saryglar and Alash Ensemble with subtitles Live performance on The Chevy Chase Show in 1993 with Bady-Dorzhu Ondar Live performance on Late Show with David Letterman in 1999 Live performance at Kraft House

Mount Mandara

Mandara is the name of the mountain that appears in the Samudra manthan episode in the Hindu Puranas, where it was used as a churning rod to churn the ocean of milk. Mahadev's serpent, offered to serve as the rope pulled on one side by a team of asuras, on the other, by a team of devas; the Puranas refer to various sacred places on the hill that are believed to be the abode of god Krishna as Madhusudana or the destroyer of the demon called Madhu, killed by Krishna and covered by the Mount Mandara. Some legends identify a hill in Banka district in Bihar with Mount Mandara. Kalidasa’s Kumarasambhava refers to foot marks of Lord Vishnu on the slopes of Mandara; the hill is replete with relics of bygone ages. Besides inscriptions and statues there are numerous rock cut sculptures depicting various Brahmanical images; the hill is revered by the Jains who believe that their 12th Tirthankara Shri Vasupujya attained nirvana here on the summit of the hill. The depiction of the Churning of the Ocean of Milk became popular in Khmer art because their creation myth involved a naga ancestor.

It is a popular motif in both Thai art. Dictionary of Hindu Lore and Legend by Anna Dallapiccola

Azizollah Khoshvaght

Azizollah Khoshvaqt known as Ayatollah Khoshvaqt, was a contemporary philosopher, mystic and faqih. He was a student of Muhammad Husayn Tabatabai, Seyyed Hossein Borujerdi and Seyyed Ruhollah Khomeini, he was the second child of the family, went to seminary after passing high-school, went to Qom after educating for five years in Lorzadeh mosque in Tehran. Azizollah Khoshvaght came back to Tehran after the end of his seminary education, got married at the age of 33, the result of this marriage was 2 sons and 4 daughters for him, his parents were from Zanjan. Khoshvaqt is considered to be Faqih and a teacher of ethics. Azizollah Khoshvaght, well known as Aziz Khoshvaght, was the Imam Jama'a of Imam Hassan-Mojtaba mosque in Tehran. Azizollah Khoshvaght died at the age of 86, when he was in Mecca on 19 February 2013. Seyyed Mostafa Khamenei, Azizollah Khoshvaght's son-in-law


Ožujsko known and marketed as Žuja, is a Croatian brand of lager beer. It is the flagship brand produced by Zagrebačka pivovara, the biggest brewery in the country, a part of Molson Coors Brewing Company since 2013, it is made from natural ingredients – barley, yeast and water. Ožujsko has a golden color, it was named after the month of March. With developments in production this seasonality is no longer important for the quality of Ožujsko pivo and now it can be brewed all year round, it is described as "a golden lager, with a deep white head. A sweet corn and malt nose gives to a fruity finish" Ožujsko beer is one of the oldest brands with uninterrupted continuity of production in Croatia, it was first produced in 1892. Ožujsko is the leading beer brand in terms of sales in Croatia, with a market share of 40%. For the last 15 years, Ožujsko is the official sponsor of the Croatian national football team

LSU Tigers swimming and diving

The LSU Tigers swimming and diving team represents Louisiana State University in the Southeastern Conference in NCAA men's swimming and diving. The team competes at the LSU Natatorium in Louisiana. Dave Geyer is the co-head coach of the men's swim team. Doug Shaffer is the co-head coach of the men's diving teams; the LSU men's swimming and diving team first competed in 1936, finishing third at the Southeastern Conference championship. There were no teams from 1940 to 1967, but in 1968 the men's swimming and diving team was reinstated. SEC Championships: 1988 Mark Andrews Andy Deichert Jarrod Marrs Todd Torres The LSU Natatorium is a swimming & diving facility located on the campus of Louisiana State University in Baton Rouge, LA; the facility, built in 1985, serves as the home of the LSU Tigers diving team. The stadium has a seating capacity of 2,200; the Natatorium features a 50-meter pool, which can be converted into two 25-meter or 25-yard pools with the use of bulkheads and includes a championship diving well with one- and three-meter springboards and five-, seven- and 10-meter platforms.

The Huey P. Long Field House was home to the LSU Tigers swimming and diving team until the LSU Natatorium was built in 1985; the LSU Tigers basketball strength training and conditioning facility is located in the LSU Strength and Conditioning facility. Built in 1997, it is located adjacent to Tiger Stadium. Measuring 10,000-square feet with a flat surface, it has 28 multi-purpose power stations, 36 assorted selectorized machines and 10 dumbbell stations along with a plyometric specific area, medicine balls, plyometric boxes and assorted speed and agility equipment, it features 2 treadmills, 4 stationary bikes, 2 elliptical cross trainers, a stepper and stepmill. List of college swimming and diving teams Official website