|
Helium
Helium (from ) is a chemical element; it has chemical symbol, symbol He and atomic number 2. It is a colorless, odorless, non-toxic, inert gas, inert, monatomic gas and the first in the noble gas group in the periodic table. Its boiling point is the lowest among all the Chemical element, elements, and it does not have a melting point at standard pressures. It is the second-lightest and second-most Abundance of the chemical elements, abundant element in the observable universe, after hydrogen. It is present at about 24% of the total elemental mass, which is more than 12 times the mass of all the heavier elements combined. Its abundance is similar to this in both the Sun and Jupiter, because of the very high nuclear binding energy (per nucleon) of helium-4 with respect to the next three elements after helium. This helium-4 binding energy also accounts for why it is a product of both nuclear fusion and radioactive decay. The most common isotope of helium in the universe is helium-4, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hebrew Language
Hebrew (; ''ʿÎbrit'') is a Northwest Semitic language within the Afroasiatic language family. A regional dialect of the Canaanite languages, it was natively spoken by the Israelites and remained in regular use as a first language until after 200 CE and as the liturgical language of Judaism (since the Second Temple period) and Samaritanism. The language was revived as a spoken language in the 19th century, and is the only successful large-scale example of linguistic revival. It is the only Canaanite language, as well as one of only two Northwest Semitic languages, with the other being Aramaic, still spoken today. The earliest examples of written Paleo-Hebrew date back to the 10th century BCE. Nearly all of the Hebrew Bible is written in Biblical Hebrew, with much of its present form in the dialect that scholars believe flourished around the 6th century BCE, during the time of the Babylonian captivity. For this reason, Hebrew has been referred to by Jews as '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hessen
Hesse or Hessen ( ), officially the State of Hesse (), is a state in Germany. Its capital city is Wiesbaden, and the largest urban area is Frankfurt, which is also the country's principal financial centre. Two other major historic cities are Darmstadt and Kassel. With an area of 21,114.73 square kilometers and a population of over six million, it ranks seventh and fifth, respectively, among the sixteen German states. Frankfurt Rhine-Main, Germany's second-largest metropolitan area (after Rhine-Ruhr), is mainly located in Hesse. As a cultural region, Hesse also includes the area known as Rhenish Hesse (Rheinhessen) in the neighboring state of Rhineland-Palatinate. Etymology The German name , like the names of other German regions ( " Swabia", " Franconia", "Bavaria", "Saxony"), derives from the dative plural form of the name of the inhabitants or eponymous tribe, the Hessians (, singular ). The geographical name represents a short equivalent of the older compound name ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zheng He
Zheng He (also romanized Cheng Ho; 1371–1433/1435) was a Chinese eunuch, admiral and diplomat from the early Ming dynasty, who is often regarded as the greatest admiral in History of China, Chinese history. Born into a Muslims, Muslim family as Ma He, he later adopted the surname Zheng conferred onto him by the Yongle Emperor (). Between 1405 and 1433, Zheng commanded seven Ming treasure voyages, treasure voyages across Asia under the commission of the Yongle Emperor and the succeeding Xuande Emperor (). According to legend, Zheng's largest ships were almost twice as long as any wooden ship ever recorded, and carried hundreds of sailors on four decks. A favorite of the Yongle Emperor, whom Zheng assisted in the Jingnan campaign that overthrew the previous Jianwen Emperor in 1402, Zheng He rose to the top of the Ming Government of the Ming Empire, imperial hierarchy and served as commander of the southern capital Nanjing. Early life and family Zheng was born Ma He to a Musl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holocene
The Holocene () is the current geologic time scale, geological epoch, beginning approximately 11,700 years ago. It follows the Last Glacial Period, which concluded with the Holocene glacial retreat. The Holocene and the preceding Pleistocene together form the Quaternary period. The Holocene is an interglacial period within the ongoing Ice age, glacial cycles of the Quaternary, and is equivalent to Marine isotope stages, Marine Isotope Stage 1. The Holocene correlates with the last maximum axial tilt towards the Sun of the Earth#Axial tilt and seasons, Earth's obliquity. The Holocene corresponds with the rapid proliferation, growth, and impacts of the human species worldwide, including Recorded history, all of its written history, technological revolutions, development of major civilizations, and overall significant transition towards urban culture, urban living in the present. The human impact on modern-era Earth and its ecosystems may be considered of global significance for th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
High Explosive
An explosive (or explosive material) is a reactive substance that contains a great amount of potential energy that can produce an explosion if released suddenly, usually accompanied by the production of light, heat, sound, and pressure. An explosive charge is a measured quantity of explosive material, which may either be composed solely of one ingredient or be a mixture containing at least two substances. The potential energy stored in an explosive material may, for example, be: * chemical energy, such as nitroglycerin or Dust explosion, grain dust * pressure, pressurized gas compressor, gas, such as a gas cylinder, aerosol can, or boiling liquid expanding vapor explosion * nuclear weapon, nuclear energy, such as in the fissile isotopes uranium-235 and plutonium-239 Explosive materials may be categorized by the speed at which they expand. Materials that detonate (the front of the chemical reaction moves faster through the material than the speed of sound) are said to be "high ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hebei
Hebei is a Provinces of China, province in North China. It is China's List of Chinese administrative divisions by population, sixth-most populous province, with a population of over 75 million people. Shijiazhuang is the capital city. It borders Shanxi to the west, Henan to the south, Shandong and Liaoning to the east, and Inner Mongolia to the north; in addition, Hebei entirely surrounds the direct-administered municipalities of Beijing and Tianjin on land. Its population is 96% Han Chinese, 3% Manchu people, Manchu, 0.8% Hui people, Hui, and 0.3% Mongols in China, Mongol. Varieties of Chinese spoken include Jilu Mandarin, the Beijing dialect of Mandarin, and Jin Chinese. During the Spring and Autumn period, Spring and Autumn and Warring States periods (771–226 BC), the region was ruled by the states of Yan (state), Yan and Zhao (state), Zhao. During the Yuan dynasty (1271–1368), the region was called Zhongshu Sheng, Zhongshu. It was called North Zhili during the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Excellency
Excellency is an honorific style (manner of address), style given to certain high-level officers of a sovereign state, officials of an international organization, or members of an aristocracy. Once entitled to the title "Excellency", the holder usually retains the right to that courtesy throughout their lifetime, although in some cases the title is attached to a particular office and is held only during tenure of that office. Generally people addressed as ''Excellency'' are heads of state, heads of government, governors, ambassadors, Roman Catholic bishops, high-ranking ecclesiastics, and others holding equivalent rank, such as heads of international organizations. Members of royal families generally have distinct addresses such as Majesty, Highness, etc.. While not a title of office itself, the honorific ''Excellency'' precedes various titles held by the holder, both in speech and in writing. In reference to such an official, it takes the form ''His'' or ''Her Excellency''; in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
High-explosive Anti-tank
High-explosive anti-tank (HEAT) is the effect of a shaped charge explosive that uses the Munroe effect to penetrate heavy armor. The warhead functions by having an explosive charge collapse a metal liner inside the warhead into a high-velocity shaped charge jet; this is capable of penetrating armor steel to a depth of seven or more times the diameter of the charge (charge diameters, CD). The shaped charge jet armor penetration effect is purely kinetic in nature; the round has no explosive or incendiary effect on the armor. Unlike standard armor piercing shell, armor-piercing rounds, a HEAT warhead's penetration performance is unaffected by the projectile's velocity, allowing them to be fired by lower-powered weapons that generate less recoil. The performance of HEAT weapons has nothing to do with heat, thermal effects, with HEAT being simply an acronym. History HEAT warheads were developed during World War II, from extensive research and development into shaped charge warh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemagglutinin Esterase
Hemagglutinin esterase (HEs) is a glycoprotein that certain enveloped viruses possess and use as an invading mechanism. HEs helps in the attachment and destruction of certain sialic acid receptors that are found on the host cell surface. Viruses that possess HEs include '' influenza C virus'', toroviruses, and coronaviruses of the subgenus '' Embecovirus'' (which does not include SARS-like coronaviruses). HEs is a dimer transmembrane protein consisting of two monomers, each monomer is made of three domains. The three domains are: membrane fusion, esterase, and receptor binding domains. The different HEs enzyme activities include: receptor binding activity, receptor hydrolysis ( esterase) activity, and membrane fusion activity. The receptor binding activity involve the attachment of HEs to N-acetyl-9-O-acetylneuraminic acid (9-O-Ac- Neu5Ac) of glycolipids and glycoproteins and in turn serve as viral receptor. Receptor hydrolysis (esterase) activity allows virus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Katherine Anne Porter
Katherine Anne Porter (May 15, 1890 – September 18, 1980) was an American journalist, essayist, short story writer, novelist, poet, and political activist. Her 1962 novel '' Ship of Fools'' was the best-selling novel in the United States that year, but her short stories received much more critical acclaim. In 1966, she was awarded the Pulitzer Prize for Fiction and the U.S. National Book Award for '' The Collected Stories of Katherine Anne Porter.'' Biography Early life Katherine Anne Porter was born in Indian Creek, Texas, as Callie Russell Porter to Harrison Boone Porter and Mary Alice (Jones) Porter. Although her father claimed maternal descent from American frontiersman Daniel Boone, Porter herself altered this alleged descent to be from Boone's brother Jonathan as "the record of his descendants was obscure, so that no-one could contradict her". This relationship was unfounded. Porter was enthusiastic about her own genealogy and family history, and spent years constructing ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hepatic Encephalopathy
Hepatic encephalopathy (HE) is an altered level of consciousness as a result of liver failure. Its onset may be gradual or sudden. Other symptoms may include movement problems, changes in mood, or changes in personality. In the advanced stages, it can result in a coma. Hepatic encephalopathy can occur in those with acute or chronic liver disease. Episodes can be triggered by infections, gastrointestinal bleeding, constipation, electrolyte problems, or certain medications. The underlying mechanism is believed to involve the buildup of ammonia in the blood, a substance that is normally removed by the liver. The diagnosis is typically based on symptoms after ruling out other potential causes. It may be supported by blood ammonia levels, an electroencephalogram, or computer tomography (CT scan) of the brain. Hepatic encephalopathy is possibly reversible with treatment. This typically involves supportive care and addressing the triggers of the event. Lactulose is fre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
