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7400-series Integrated Circuits
The 7400 series is a popular logic family of transistor–transistor logic (TTL) integrated circuits (ICs). In 1964, Texas Instruments introduced the SN5400 series of logic chips, in a ceramic semiconductor package. A low-cost plastic package SN7400 series was introduced in 1966 which quickly gained over 50% of the logic chip market, and eventually becoming ''de facto'' standardized electronic components. Since the introduction of the original bipolar-transistor TTL parts, pin-compatible parts were introduced with such features as low power CMOS technology and lower supply voltages. Surface mount packages exist for several popular logic family functions. Overview The 7400 series contains hundreds of devices that provide everything from basic logic gates, flip-flops, and counters, to special purpose bus transceivers and arithmetic logic units (ALU). Specific functions are described in a list of 7400 series integrated circuits. Some TTL parts were made with an ext ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Felix HC
The following is a list of clones of Sinclair Research's ZX Spectrum home computer. This list includes both official clones (from Timex Corporation) and many unofficial clones, most of which were produced in Eastern Bloc countries. The list does not include computers which require additional hardware or software to become ZX-compatible. Many software emulators can fully or partially emulate some clones as well. Official The only official clones of the Spectrum were made by Timex. There were three models developed, only two of which were released: Timex Sinclair 2068 The Timex Sinclair 2068 or T/S 2068 (also known as TC 2068 or UK 2086) was a significantly more sophisticated machine than the original Spectrum. The most notable changes were the addition of a cartridge port, an AY-3-8912 sound chip, and an improved ULA giving access to better graphics modes. The T/S 2068 was produced for consumers in the United States, while very similar machines were marketed in Portugal a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HC Smoke
HC, hc or H/C may refer to: Science, technology, and mathematics Medicine * Health Canada * Hemicrania continua * Hyperelastosis cutis or hereditary equine regional dermal asthenia Chemistry * Hemocyanin, a metalloprotein abbreviated Hc * HC smoke, a US military designation for Hexachloroethane * Homocapsaicin, a capsaicinoid *Hydrocarbon, a category of substances consisting only of hydrogen and carbon Other uses in science, technology, and mathematics * 74HC-series integrated circuits, a logic family of integrated circuits * Felix HC, a series of Romanian personal microcomputers produced by ICE Felix Bucharest and which were ZX Spectrum clones * '' Hemianthus callitrichoides'', a freshwater aquatic plant native to Cuba * + h.c., a notation used in mathematics and quantum physics Sports * Head Coach * Hors catégorie (French), used in cycle races to designate a climb that is "beyond categorization" * UCI .HC road cycling races (1.HC and 2.HC), the second tier of e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hospitality Club
Hospitality Club (HC) was a hospitality exchange service (a gift economy network for finding homestays whereby hosts were not allowed to charge for lodging) accessible via a website. HC's specified goals were to facilitate "intercultural understanding ... bringing people together ... travelers and locals". History Hospitality Club was founded in July 2000 in Koblenz, by Veit Kühne, who was inspired by a trip to South America. It later incorporated technology from Hospex.org, a similar service. In 2005, a disagreement between some members of Hospitality Club and its founder led to the foundation of BeWelcome. Many HC members, who became volunteers within Couchsurfing, left HC towards CS because of its missing legal status and insufficient management transparency. In February 2006, Kühne was working full-time on Hospitality Club. In the spring of 2006, an event took place in Riga Riga ( ) is the capital, Primate city, primate, and List of cities and towns in Latvia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hors Catégorie
''Hors catégorie'' (HC) is a French term used in stage bicycle races to designate a climb that is "beyond categorization". The term was originally used for those mountain roads where cars were not expected to be able to pass. The HC climb is the most difficult type of climb in a race. It is more demanding than a Category 1 climb which in turn is more demanding than a Category 2 climb and so on. The easiest category is Category 4. These five categories are defined by their steepness and length. In addition, their position on the route can play a role. For instance, a climb that would normally be a Category 1 climb can become a HC climb if it is the final climb of a stage. The average HC climb in the Tour de France from 2012 to 2016 is 16.1 kilometers long and has a grade of 7.4%. There are around 7 HC climbs per Tour.Analysis of categorized climbat Danskebjerge.dk/ref> History When the mountains classification in the Tour de France originated in the 1933 Tour de France, ther ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hyperelastosis Cutis
Hereditary equine regional dermal asthenia (HERDA), also known as hyperelastosis cutis (HC), is an inherited autosomal recessive connective tissue disorder. It develops from a homozygous recessive mutation that weakens collagen fibers that allow the skin of the animal to stay connected to the rest of the animal. Affected horses have extremely fragile skin that tears easily and exhibits impaired healing. In horses with HC, the skin separates between the deep and superficial dermis. There is no cure. Most affected individuals receive an injury they cannot heal, and are euthanized. Managed breeding strategy is currently the only option for reducing the incidence of the disease. The disease is found primarily in the American Quarter Horse, specifically in cutting horse lines. Affected horses have been found to trace to the stallion Poco Bueno, or possibly, farther back to one of his ancestors. Researchers have now named four deceased Quarter Horse stallions that were carriers and produ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrocarbon
In organic chemistry, a hydrocarbon is an organic compound consisting entirely of hydrogen and carbon. Hydrocarbons are examples of group 14 hydrides. Hydrocarbons are generally colourless and Hydrophobe, hydrophobic; their odor is usually faint, and may be similar to that of gasoline or Naphtha, lighter fluid. They occur in a diverse range of molecular structures and phases: they can be gases (such as methane and propane), liquids (such as hexane and benzene), low melting solids (such as paraffin wax and naphthalene) or polymers (such as polyethylene and polystyrene). In the fossil fuel industries, ''hydrocarbon'' refers to naturally occurring petroleum, natural gas and coal, or their hydrocarbon derivatives and purified forms. Combustion of hydrocarbons is the main source of the world's energy. Petroleum is the dominant raw-material source for organic commodity chemicals such as solvents and polymers. Most anthropogenic (human-generated) emissions of greenhouse gases are eithe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemicrania Continua
Hemicrania continua (HC) is a persistent unilateral headache that responds to indomethacin. It is usually unremitting, but rare cases of remission have been documented. Hemicrania continua is considered a primary headache disorder, meaning that another condition does not cause it. Symptoms In hemicrania continua, basal pain is a dull aching pressure similar to that of TTHs (Tension-Type Headaches) that occurs nearly always on the same side of the head and face. Pain ranges from mild to severe and is characterized by fluctuations that increase in intensity up to three to five times per 24-hour cycle. The range of duration of exacerbations has no boundaries and varies from a few seconds to up to two weeks. While attacks tend to be more frequent at night, no circadian periodicity such as in cluster headache can be observed. The nature of pain changes during the exacerbation phase, becoming more piercing, throbbing, and intense, generally paired with other highly debilitating symp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Star Routes
Star routes is a term used in connection with the United States postal service The United States Postal Service (USPS), also known as the Post Office, U.S. Mail, or simply the Postal Service, is an independent agencies of the United States government, independent agency of the executive branch of the federal governmen ... and the contracting of mail delivery services. The term is defunct as of 1970, but still is occasionally used to refer to Highway Contract Routes (HCRs), which replaced the Star routes. National Postal Museum.What is a Star Route? Retrieved 2007-05-08. The term is mostly used in connection with a series of scandals in the 1870s involving bribes to postal officials. Background Prior to 1845, transportation of inland mail, other than by railroad, was given to bidders who offered stage or coach service. This was abolished by act of Congress on March 3, 1845, which provided that the postmaster-general should lease all such contracts to the lowest bidder who ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heritage Corridor
The Heritage Corridor (HC) is a Metra commuter rail line in Chicago, Illinois, and its southwestern suburbs, terminating in Joliet, Illinois. While Metra does not refer to its lines by colors, the Heritage Corridor appears on Metra timetables as "Alton Maroon," after the Alton Railroad, which ran trains on this route. The name Heritage Corridor refers to the Illinois and Michigan Canal Heritage Corridor. Established in 1984, it runs parallel to the line. Unlike other Metra lines, the Heritage Corridor runs during weekday rush hours only in the peak direction–to Chicago in the morning and Joliet in the afternoon, with the trip from Joliet to Union Station taking about 1 hour and 7 minutes. The Rock Island District also serves Joliet with 21 trains. As of February 15, 2024, Metra operates six trains (three in each direction) on the Heritage Corridor on weekdays, with each train serving all stations on the route. All inbound trains originate from in the morning, and all outb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Health Canada
Health Canada (HC; )Health Canada is the applied title under the Federal Identity Program; the legal title is Department of Health (). is the Structure of the Canadian federal government#Departments, with subsidiary units, department of the Government of Canada responsible for national health policy. The department itself is also responsible for numerous federal health-related agencies, including the Canadian Food Inspection Agency (CFIA) and the Public Health Agency of Canada (PHAC), among others. These organizations help to ensure compliance with federal law in a variety of Healthcare in Canada, healthcare, Agriculture in Canada, agricultural, and Pharmaceutics, pharmaceutical activities. This responsibility also involves extensive collaboration with various other federal- and provincial-level organizations in order to ensure the safety of food, health, and Medication, pharmaceutical products—including the regulation of health research and pharmaceutical manufacturing/Clinical ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aero-Tropics Air Services
Lip-Air Pty Ltd, operating as Aero-Tropics Air Services (ATAS), was an airline based in Cairns, Queensland, Australia Australia, officially the Commonwealth of Australia, is a country comprising mainland Australia, the mainland of the Australia (continent), Australian continent, the island of Tasmania and list of islands of Australia, numerous smaller isl .... Its main base was Cairns Airport, with its operating hub at Horn Island Airport. History Lip-Air Pty Ltd was a privately owned company established by the Lippmann family in 1995. The company's Aero Tropics Air Services (ATAS) division started operating air charters in 1997, serving the region of Torres Strait, Cape York and the Gulf of Carpentaria. ATAS obtained a Regular Public Transport licence in February 2000 from the Civil Aviation Safety Authority (CASA) and began operating daily scheduled services to/ from and between the Torres Strait Islands. In March 2007 it had 50 employees. It grew fr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
