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VBM Medizintechnik
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VBM may refer to: * Valence band maximum - highest energy of the electrons in the valence band of a ( semiconducting) solid, see band gap * Value-based management - an approach to corporate strategic management * Voxel-based morphometry - a technique in neuroimaging analysis * Virginia Beach Mariners * The Virtual Beit Midrash of Yeshivat Har Etzion * The Virtual Beit Midrash of Mercaz HaRav Kook * Valence Band Maximum, see Band gap * Vote by mail Postal voting is voting in an election where ballot papers are distributed to electors (and typically returned) by post, in contrast to electors voting in person at a polling station or electronically via an electronic voting system. In an ele ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Valence And Conduction Bands
In solid-state physics, the valence band and conduction band are the bands closest to the Fermi level, and thus determine the electrical conductivity of the solid. In nonmetals, the valence band is the highest range of electron energies in which electrons are normally present at absolute zero temperature, while the conduction band is the lowest range of vacant electronic states. On a graph of the electronic band structure of a material, the valence band is located below the Fermi level, while the conduction band is located above it. The distinction between the valence and conduction bands is meaningless in metals, because conduction occurs in one or more partially filled bands that take on the properties of both the valence and conduction bands. Band gap In semiconductors and insulators the two bands are separated by a band gap, while in semimetals the bands overlap. A band gap is an energy range in a solid where no electron states can exist due to the quantization of e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Semiconductor
A semiconductor is a material which has an electrical resistivity and conductivity, electrical conductivity value falling between that of a electrical conductor, conductor, such as copper, and an insulator (electricity), insulator, such as glass. Its electrical resistivity and conductivity, resistivity falls as its temperature rises; metals behave in the opposite way. Its conducting properties may be altered in useful ways by introducing impurities ("doping (semiconductor), doping") into the crystal structure. When two differently doped regions exist in the same crystal, a semiconductor junction is created. The behavior of charge carriers, which include electrons, ions, and electron holes, at these junctions is the basis of diodes, transistors, and most modern electronics. Some examples of semiconductors are silicon, germanium, gallium arsenide, and elements near the so-called "metalloid staircase" on the periodic table. After silicon, gallium arsenide is the second-most common s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Band Gap
In solid-state physics, a band gap, also called an energy gap, is an energy range in a solid where no electronic states can exist. In graphs of the electronic band structure of solids, the band gap generally refers to the energy difference (in electron volts) between the top of the valence band and the bottom of the conduction band in insulators and semiconductors. It is the energy required to promote a valence electron bound to an atom to become a conduction electron, which is free to move within the crystal lattice and serve as a charge carrier to conduct electric current. It is closely related to the HOMO/LUMO gap in chemistry. If the valence band is completely full and the conduction band is completely empty, then electrons cannot move within the solid because there are no available states. If the electrons are not free to move within the crystal lattice, then there is no generated current due to no net charge carrier mobility. However, if some electrons transfer from th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Value-based Management
Shareholder value is a business term, sometimes phrased as shareholder value maximization. It became prominent during the 1980s and 1990s along with the management principle value-based management or "managing for value". Definition The term "shareholder value", sometimes abbreviated to "SV", can be used to refer to: *The market capitalization of a company; *The concept that the primary goal for a company is to increase the wealth of its shareholders (owners) by paying dividends and/or causing the stock price to increase (i.e. the Friedman doctrine introduced in 1970); *The more specific concept that planned actions by management and the returns to shareholders should outperform certain bench-marks such as the cost of capital concept. In essence, the idea that shareholders' money should be used to earn a higher return than they could earn themselves by investing in other assets having the same amount of risk. The term in this sense was introduced by Alfred Rappaport in 1986. For ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Voxel-based Morphometry
Voxel-based morphometry is a computational approach to neuroanatomy that measures differences in local concentrations of brain tissue, through a voxel-wise comparison of multiple brain images. In traditional morphometry, volume of the whole brain or its subparts is measured by drawing regions of interest (ROIs) on images from brain scanning and calculating the volume enclosed. However, this is time consuming and can only provide measures of rather large areas. Smaller differences in volume may be overlooked. The value of VBM is that it allows for comprehensive measurement of differences, not just in specific structures, but throughout the entire brain. VBM registers every brain to a template, which gets rid of most of the large differences in brain anatomy among people. Then the brain images are smoothed so that each voxel represents the average of itself and its neighbors. Finally, the image volume is compared across brains at every voxel. However, VBM can be sensitive to vari ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Virginia Beach Mariners
The Virginia Beach Mariners were an American football (soccer), soccer club, who formerly played in the USL First Division of the United Soccer Leagues, the second division in the US Soccer hierarchy behind Major League Soccer. On March 30, 2007 the team folded due to lack of ownership. The Mariners played at the Virginia Beach Sportsplex in Virginia Beach, Virginia, from 1999 up to their demise in 2007. The team was founded in 1994 as the ''Hampton Roads Hurricanes'', but they changed their name to Mariners after the first year. For the 2003 season, the team changed their name from Hampton Roads Mariners to the more widely recognizable Virginia Beach Mariners. The team went on a one- year hiatus in 1997, after which they joined the A-League. In 2006, the Mariners added a USL Premier Development League club, the Virginia Beach Submariners. Shortly after the termination of the Mariners, the Submariners were taken over by the Hampton Roads Piranhas, a women's W-League soccer club, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yeshivat Har Etzion
Yeshivat Har Etzion (YHE; ), commonly known in English as "Gush" and in Hebrew as "Yeshivat HaGush", is a hesder yeshiva located in Alon Shvut, an Israeli settlement in Gush Etzion. It is considered one of the leading institutions of advanced Torah study in the world and with a student body of roughly 480, it is one of the largest hesder yeshivot in the West Bank. History In 1968, shortly after the Six-Day War, a movement was founded to resettle the Gush Etzion region, which had been abandoned by Jews following the Kfar Etzion massacre. Yehuda Amital, a prominent rabbi and Jewish educator, was asked to head a yeshiva in the region. In 1971, Rabbi Aharon Lichtenstein moved from the United States to join Amital as rosh yeshiva. First established in Kfar Etzion, it moved to Alon Shvut, where it developed into a major institution. The current yeshiva building was finished in 1977. In 1997 a women’s beit midrash was established for Israeli and overseas students as a sister school in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mercaz HaRav Kook
Mercaz HaRav (officially, he, מרכז הרב - הישיבה המרכזית העולמית, "The Center of Rabbi ook- the Central Universal Yeshiva") is a national-religious yeshiva in Jerusalem, founded in 1924 by Ashkenazi Chief Rabbi Abraham Isaac Kook. Located in the city's Kiryat Moshe neighborhood, it has become the most prominent religious-Zionist yeshiva in the world and synonymous with Rabbi Kook's teachings. Many Religious Zionist educators and leaders have studied at Mercaz HaRav, where hundreds of future militants, opposed to territorial compromises and promoting Israeli settlement of the occupied Palestinian territories, received their formative education. Name The yeshiva's official name is The Central Universal Yeshiva, indicating its role in Rabbi Kook's vision as a central institution for the spiritual revitalization of the Jewish people. Kook, however, lacked the financial backing necessary to establish a full-fledged academic institution. The yeshiva grew ou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Band Gap
In solid-state physics, a band gap, also called an energy gap, is an energy range in a solid where no electronic states can exist. In graphs of the electronic band structure of solids, the band gap generally refers to the energy difference (in electron volts) between the top of the valence band and the bottom of the conduction band in insulators and semiconductors. It is the energy required to promote a valence electron bound to an atom to become a conduction electron, which is free to move within the crystal lattice and serve as a charge carrier to conduct electric current. It is closely related to the HOMO/LUMO gap in chemistry. If the valence band is completely full and the conduction band is completely empty, then electrons cannot move within the solid because there are no available states. If the electrons are not free to move within the crystal lattice, then there is no generated current due to no net charge carrier mobility. However, if some electrons transfer from th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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