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HPa
HPA may refer to: Organizations * Harry Potter Alliance, a charity * Halifax Port Authority, Canada * Hamburg Port Authority, Germany * Hawaii Preparatory Academy, a school in Hawaii, US * Health Protection Agency, UK * Heerespersonalamt, the German Army Personnel Agency 1920-1944 * Hollywood Post Alliance, an American trade organization * Houston Peace Academy of the Islamic Education Institute of Texas, US * Hurlingham Polo Association, UK polo governing body * HPA Toucan human-powered aircraft built by Hertfordshire Pedal Aeronauts People *Hans Peter Anvin (born 1972), Swedish computer programmer *Howlin' Pelle Almqvist (Born 1978), Swedish lead singer of garage rock band The Hives Science * Hectopascal (hPa), a unit of pressure * Human platelet antigen * Human Protein Atlas * Hydrogen pinch analysis * Hypothalamic–pituitary–adrenal axis in physiology Technology *High-performance addressing, in LCD displays *Host protected area of computer data storage *Human-powered ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hectopascal
The pascal (symbol: Pa) is the unit of pressure in the International System of Units (SI), and is also used to quantify internal pressure, stress, Young's modulus, and ultimate tensile strength. The unit, named after Blaise Pascal, is defined as one newton per square metre and is equivalent to 10 barye (Ba) in the CGS system. The unit of measurement called standard atmosphere (atm) is defined as 101,325 Pa. Common multiple units of the pascal are the hectopascal (1 hPa = 100 Pa), which is equal to one millibar, and the kilopascal (1 kPa = 1000 Pa), which is equal to one centibar. Meteorological observations typically report atmospheric pressure in hectopascals per the recommendation of the World Meteorological Organization, thus a standard atmosphere (atm) or typical sea-level air pressure is about 1013 hPa. Reports in the United States typically use inches of mercury or millibars (hectopascals). In Canada these reports are given in kilopasc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
High-pressure Air
Paintball is an equipment-intensive sport and in order to safely conduct a game, every player requires a paintball marker, marker with propellant to fire the paint, a mask to protect the eyes and face, Paintball equipment#Paintballs, paintballs, and a loader to hold them. To ensure safety off the playing field, a barrel sock or plug for the marker is also compulsory. Depending on type of play, additional equipment can include gloves, a pack designed to comfortably carry pods containing extra paintballs, and a squeegee or swab for cleaning out the barrel in case a paintball breaks. Players may also elect to wear padding or armor in order to reduce the impact of incoming paintballs. Markers A paintball marker is the primary piece of equipment used in paintball to tag an opposing player. An expanding gas (usually carbon dioxide or high-pressure air) forces a paintball through the barrel at a muzzle velocity of approximately . This velocity is sufficient for most paintballs to break ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Human Platelet Antigen
Human platelet antigens (HPA) are polymorphisms in platelet antigens. These can stimulate production of alloantibodies (that is, antibodies against other people's antigens) in recipients of transfused platelets from donors with different HPAs. These antibodies cause neonatal alloimmune thrombocytopenia, post-transfusion purpura, and some cases of platelet transfusion refractoriness to infusion of donor platelets. __TOC__ Overview A nomenclature was devised by International Society of Blood Transfusion (ISBT), platelet working party to overcome problems generated by many different nomenclatures in use. Since inception of this list, a greater number of antigens have been described and the molecular basis of many has been resolved. To date, 24 platelet-specific alloantigens have been defined by immune sera, of which 12 are grouped in six biallelic systems (HPA-1, -2, -3, -4, -5, -15). For the remaining 12, alloantibodies against the thetical but not the antithetical antigen have ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Honor Oak Park Railway Station
Honor Oak Park railway station serves the suburban area of Honor Oak in the London Borough of Lewisham. It is down the line from , between and . The station is operated by London Overground, with London Overground and Southern trains serving the station. Thameslink and some Southern services pass through the station. It is located in Travelcard Zone 3. History The line on which it stands was opened in 1839, but this station was only opened by the London, Brighton and South Coast Railway on 1 April 1886. The housebuilders who were developing the area contributed £1,000 towards the cost of construction. There are four tracks through the station, with platforms on the outer Slow lines. These platforms are connected to the booking office (see illustration) by a footbridge. It was named to distinguish it from the Honor Oak station which existed at the time. London Overground took over operating the station in September 2009, which has benefited from the London Overground Eas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Autoscaling
Autoscaling, also spelled auto scaling or auto-scaling, and sometimes also called automatic scaling, is a method used in cloud computing that dynamically adjusts the amount of computational resources in a server farm - typically measured by the number of active servers - automatically based on the load on the farm. For example, the number of servers running behind a web application may be increased or decreased automatically based on the number of active users on the site. Since such metrics may change dramatically throughout the course of the day, and servers are a limited resource that cost money to run even while idle, there is often an incentive to run "just enough" servers to support the current load while still being able to support sudden and large spikes in activity. Autoscaling is helpful for such needs, as it can reduce the number of active servers when activity is low, and launch new servers when activity is high. Autoscaling is closely related to, and builds upon, the idea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Human-powered Aircraft
A human-powered aircraft (HPA) is an aircraft belonging to the class of vehicles known as human-powered transport. Human-powered aircraft have been successfully flown over considerable distances. However, they are still primarily constructed as engineering challenges rather than for any kind of recreational or utilitarian purpose. History Early attempts at human-powered flight were unsuccessful because of the difficulty of achieving the high power-to-weight ratio. Prototypes often used ornithopter principles which were not only too heavy to meet this requirement but aerodynamically unsatisfactory. First attempts In 1904, Scientific American published an article and a photograph of a bicycle plane built by Steward Winslow of Riparia, Washington. He attempted to fly his plane on 30 July 1904, but one of the wheels failed. An early human-powered aircraft was the Gerhardt Cycleplane, developed by W. Frederick Gerhardt at McCook Field in Dayton, Ohio in 1923. The aircraf ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Host Protected Area
The host protected area (HPA) is an area of a hard drive or solid-state drive that is not normally visible to an operating system. It was first introduced in the ATA-4 standard CXV (T13) in 2001. How it works The IDE controller has registers that contain data that can be queried using ATA commands. The data returned gives information about the drive attached to the controller. There are three ATA commands involved in creating and using a host protected area. The commands are: * IDENTIFY DEVICE * SET MAX ADDRESS * READ NATIVE MAX ADDRESS Operating systems use the IDENTIFY DEVICE command to find out the addressable space of a hard drive. The IDENTIFY DEVICE command queries a particular register on the IDE controller to establish the size of a drive. This register however can be changed using the SET MAX ADDRESS ATA command. If the value in the register is set to less than the actual hard drive size then effectively a host protected area is created. It is protected because the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
High-performance Addressing
High-performance addressing (HPA) is an LCD passive-matrix display technology commonly found on low-end portable computers; versions of HPA have been developed by Hitachi and by Sharp. HPA enables higher response rates and contrast, displaying up to 16-million colors; however, HPA displays lack the crispness that is found with an Active-matrix display. HPA uses a technique called ''multiline addressing'' in which the incoming video signal is analyzed and the image is refreshed with a frequency as high as possible. References Display technology {{Compu-graphics-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hypothalamic–pituitary–adrenal Axis
The hypothalamic–pituitary–adrenal axis (HPA axis or HTPA axis) is a complex set of direct influences and feedback interactions among three components: the hypothalamus (a part of the brain located below the thalamus), the pituitary gland (a pea-shaped structure located below the hypothalamus), and the adrenal (also called "suprarenal") glands (small, conical organs on top of the kidneys). These organs and their interactions constitute the HPA axis. The HPA axis is a major neuroendocrine system that controls reactions to stress and regulates many body processes, including digestion, the immune system, mood and emotions, sexuality, and energy storage and expenditure. It is the common mechanism for interactions among glands, hormones, and parts of the midbrain that mediate the general adaptation syndrome (GAS). While steroid hormones are produced mainly in vertebrates, the physiological role of the HPA axis and corticosteroids in stress response is so fundamental that analogou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrogen Pinch Analysis
Hydrogen pinch analysis (HPA) is a hydrogen management method that originates from the concept of heat pinch analysis. HPA is a systematic technique for reducing hydrogen consumption and hydrogen generation through integration of hydrogen-using activities or processes in the petrochemical industry, petroleum refineries hydrogen distribution networks and hydrogen purification. Principle A mass analysis is done by representing the purity and flowrate for each stream from the hydrogen consumers (sinks), such as hydrotreaters, hydrocrackers, isomerization units and lubricant plants and the hydrogen producers (sources), such as hydrogen plants and naphtha reformers, streams from hydrogen purifiers, membrane reactors, pressure swing adsorption and continuous distillation and off-gas streams from low- or high-pressure separators. The source-demand diagram shows bottlenecks, surplus or shortages. The hydrogen pinch is the purity at which the hydrogen network has neither hydrogen surp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Human Protein Atlas
The Human Protein Atlas (HPA) is a Swedish-based program started in 2003 with the aim to map all the human proteins in cells, tissues and organs using integration of various omics technologies, including antibody-based imaging, mass spectrometry-based proteomics, transcriptomics and systems biology. All the data in the knowledge resource is open access to allow scientists both in academia and industry to freely access the data for exploration of the human proteome. In December 2022, version 22 was launched where two new sections, a Human Disease Blood Atlas and a Structure resource section, were introduced, both relying heavily on AI-based prediction modelling and machine learning. The resource now includes twelve separate sections with complementary information about all human proteins. All data has been updated on the approximately 5 million individual web pages. The Human Protein Atlas program has already contributed to several thousands of publications in the field of huma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harry Potter Alliance
Fandom Forward (formerly The Harry Potter Alliance) is a nonprofit organization that was initially run by ''Harry Potter'' fans but that has since expanded to include members of various fandoms. It was founded by Andrew Slack in 2005 to draw attention to human rights violations in Sudan. Since then, the organization's campaigns have focused on topics such as literacy, United States immigration reform, economic justice, LGBT rights, sexism, labor rights, mental health, body image, and climate change. They have received recognition from many popular figures in the ''Harry Potter'' community and have been the subject of multiple academic studies on fan activism and civic engagement among youth. History 2005–2008 Fandom Forward was founded in 2005 as The Harry Potter Alliance by comedian Andrew Slack and the wizard rock band Harry and the Potters, initially collecting donations for Amnesty International at their shows. In 2006, the organization partnered with Walmart Watch to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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