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Topic Review
Key Technologies of Smart Energy System
The Energy Internet is the representative achievement and product of the smart energy system. It is the product of the deep integration of energy and the Internet. It is a new energy system with the characteristics of open interconnection of multi-energy, free energy transmission, open peer-to-peer access and so on, based on electrical engineering technology represented by power electronics technology and combined with relatively mature information technology and intelligent management technology at the present stage. Therefore, the Energy Internet is another important topic after smart grids in the field of energy.
  • 565
  • 17 Jan 2023
Topic Review
Khatt Shebib
The Khatt Shebib is an ancient wall in Southern Jordan. The remains of the wall are 150 km long, making it the longest linear archaeological site in Jordan. The archaeological ruins were first identified by British diplomat Sir Alec Kirkbride in 1948. Ever since, a range of disciplines, including archaeologists, scientists and anthropologists, have studied the wall. The date of the Khatt Shebib's construction is still unknown, however, it has been widely debated by archaeologists. This is evident as some archaeologists argue that the wall was built in the Iron Age, whilst others argue it was constructed in the Nabataean period. The Khatt Shebib was built and used by the semi-nomadic Bedouin people, whose livelihoods consisted of herding and farming in the harsh, arid environment of the Jordan desert. The Khatt Shebib was not used for military purposes rather the ancient wall served as a border. At the time of its construction, the wall was approximately no taller than a meter and a half high. Due to various threats to the integrity of the wall, including climatic issues and growing population pressures, the wall is significantly smaller. The Khatt Shebib has gained increasing attention amongst archaeologists. The leading method of studying the wall is aerial archaeology and multiple international archaeological organisation have established projects in order to understand and discover more about the wall.
  • 561
  • 27 Oct 2022
Topic Review
Kiev
Kiev or Kyiv (Ukrainian: Київ; Russian: Киев, romanized: Kiyev) is the capital and most populous city of Ukraine . It is in north-central Ukraine along the Dnieper River. Its population in July 2015 was 2,887,974 (though higher estimated numbers have been cited in the press), making Kiev the seventh-most populous city in Europe. Kiev is an important industrial, scientific, educational and cultural center of Eastern Europe. It is home to many high-tech industries, higher education institutions, and historical landmarks. The city has an extensive system of public transport and infrastructure, including the Kiev Metro. The city's name is said to derive from the name of Kyi, one of its four legendary founders. During its history, Kiev, one of the oldest cities in Eastern Europe, passed through several stages of prominence and obscurity. The city probably existed as a commercial center as early as the 5th century. A Slavic settlement on the great trade route between Scandinavia and Constantinople, Kiev was a tributary of the Khazars, until its capture by the Varangians (Vikings) in the mid-9th century. Under Varangian rule, the city became a capital of the Kievan Rus', the first East Slavic state. Completely destroyed during the Mongol invasions in 1240, the city lost most of its influence for the centuries to come. It was a provincial capital of marginal importance in the outskirts of the territories controlled by its powerful neighbours, first Lithuania, then Poland and Russia. The city prospered again during the Russian Empire's Industrial Revolution in the late 19th century. In 1918, after the Ukrainian National Republic declared independence from Soviet Russia, Kiev became its capital. From 1921 onwards Kiev was a city of Soviet Ukraine, which was proclaimed by the Red Army, and, from 1934, Kiev was its capital. The city was almost completely ruined during World War II but quickly recovered in the postwar years, remaining the Soviet Union's third-largest city. Following the collapse of the Soviet Union and Ukrainian independence in 1991, Kiev remained Ukraine's capital and experienced a steady influx of ethnic Ukrainian migrants from other regions of the country. During the country's transformation to a market economy and electoral democracy, Kiev has continued to be Ukraine's largest and wealthiest city. Its armament-dependent industrial output fell after the Soviet collapse, adversely affecting science and technology, but new sectors of the economy such as services and finance facilitated Kiev's growth in salaries and investment, as well as providing continuous funding for the development of housing and urban infrastructure. Kiev emerged as the most pro-Western region of Ukraine; parties advocating tighter integration with the European Union dominate during elections.
  • 3.8K
  • 10 Nov 2022
Topic Review
Kirtlandian
The Kirtlandian is a North American land-vertebrate faunal age of the Cretaceous period, following the Judithian and succeeded by the Edmontonian. It lasted about 2 million years, ca 74.8 to 72.8 Mya and is characterized by the ceratopsian Pentaceratops sternbergii, which lived throughout the Kirtlandian. It was first named by R.M. Sullivan and S.G. Lucas in 2003 as a faunal age for the Kirtland and Fruitland formations. Previously, only five land-vertebrate ages were identified from the Late Cretaceous. as identified by Loris S. Russell in 1975, they include the Paluxian, Aquilan, Judithian, Edmontonian, and the Lancian. Before the naming of the Kirtlandian, three gaps, between the Paluxian and Aquilan, the Aquilan and the Judithian, and the Judithian and Edmontonian, were identified but not named. The Fruitland Formation measures 97 to 107 metres (318 to 351 ft) thick, and with the 594 metres (1,949 ft) of the Kirtland Formation, the Kirtlandian consists of 701 metres (2,300 ft) of sediments. The rock types within the formations are primarily coal beds, but also include sandstone, siltstone, mudstone, and shale. Within the sediments with a Kirtlandian age, two local faunas, the Hunter Wash local fauna, and the Willow Wash local fauna, have been identified. The currently accepted date of the Kirtlandian is 74.8 to 72.8 million years ago.
  • 379
  • 04 Nov 2022
Topic Review
Knife Handle Working Face
With the rapid development of the social economy, the demand for coal is also increasing. Due to large-scale mining in shallow areas, coal resources are being increasingly depleted. Coal mines are gradually being mined in deep areas. Due to the complexity of coal seam conditions and variability, in order to reduce the loss of coal resources and the amount of moving, and to ensure the efficient mining of mines, the knife handle-type working face came into being. The complex overlying rock structure after the mining of the knife handle-type working face has brought great difficulties to the control of the surrounding rock of the working face.
  • 246
  • 08 Nov 2023
Topic Review
Koh-i-Sultan
Koh-i-Sultan is a volcano in Balochistan, Pakistan. It is part of the tectonic belt formed by the collision of India and Asia: specifically, a segment influenced by the subduction of the Arabian plate beneath the Asian plate and forming a volcanic arc which includes the Bazman and Taftan volcanoes in Iran. The volcano consists of three main cones, with heavily eroded craters running west-northwest and surrounded by a number of subsidiary volcanic centres. Its summit is 2,334 metres (7,657 ft) high, and the crater associated with the Miri cone has a smaller crater inside. The volcano is formed by andesite and dacite rocks, with fragmentary rocks prevailing over lava flows. The rocks have typical arc-volcano chemistry and composition, with a progression from andesite to dacite in the eruption products with younger age. Potassium-argon dating has indicated an age range from 5,900,000 to 90,000 years. Subsequent erosion has generated a large debris apron around the base of the volcano and carved rock formations which impressed early explorers; one well-known rock formation is Neza e Sultan. Geothermal activity and the emission of volcanic gases are ongoing, and the volcano has been prospected for the possibility of obtaining geothermal energy. The geothermal activity has resulted in widespread rock alteration and the formation of sulfur deposits, which were mentioned in a 1909 report and later mined. Koh-i-Sultan also has deposits of other minerals.
  • 6.2K
  • 04 Oct 2022
Topic Review
Konti–Skan
Konti–Skan (also known as Kontiskan) is the name of high-voltage direct-current transmission line between Denmark and Sweden.
  • 348
  • 21 Nov 2022
Topic Review
Korea's Environmental Life Cycle Assessment
The Life Cycle Assessment (LCA) as an environmental-impact assessment method is gaining increasing attention all over the world due to the urgent need for the preservation and sustainability of the environment. Commonly utilized in the environmental analysis of businesses, industries, products, and services, this assessment method promoted by the United Nations Environment Programme (UNEP)/Society of Environmental Toxicology and Chemistry (SETAC) Life Cycle Initiative, the Forum for Sustainability through Life Cycle Assessment (FSLCI), International reference Life Cycle Database System (ILCD), the European reference Life Cycle Database system (ELCD), and a host of others aims at improving environmental performance towards the achievement of economically viable, safe, and sustainable societies. In Korea, LCA has drawn much attention from both industry and academia since the mid-90s, hence this study assessed the status of environmental LCA studies as it concerns the country. The Life Cycle Assessment technique serves as an important means of identifying the environmental impact of products or services throughout their entire life cycle stages. 
  • 1.1K
  • 30 Jun 2021
Topic Review
Korla
Korla (sometimes as Kurla, or Kurle) is the second largest city in Xinjiang, and is, administratively, a county-level city and the seat of the Bayingolin Mongol Autonomous Prefecture, which is larger than Great Britain and is the largest Chinese prefecture. Korla is also known for its "fragrant" pears.
  • 722
  • 26 Oct 2022
Topic Review
Kouvola
Kouvola (Finnish pronunciation: [ˈkou̯ʋolɑ]) is a city and municipality in southeastern Finland. It is located along the Kymijoki River in the region of Kymenlaakso, 62 kilometres (39 mi) kilometers east of Lahti, 87 kilometres (54 mi) west of Lappeenranta and 134 kilometres (83 mi) northeast of the capital, Helsinki. With Kotka, Kouvola is one of the capital centers and is the largest city in the Kymenlaakso region. Kouvola is bordered by the municipalities of Hamina, Heinola, Iitti, Kotka, Lapinjärvi, Loviisa, Luumäki, Miehikkälä, Mäntyharju, Pyhtää and Savitaipale. Kouvola, which had population growth as late as the 1980s, has suffered a loss of migration since the 1990s. Over time, the loss has only deepened, so that at the end of the 2010s Kouvola was Finland's worst migration loss area. Natural demographics have also trended downward; in 2017, more than 450 more people died in the city than new ones were born. The reasons for the emigration are thought to be largely due to job losses in the region.
  • 528
  • 28 Nov 2022
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