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Class D (other)
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The term Class D may refer to: * Class D (baseball), a defunct class in minor league baseball in North America * Class-D amplifier or switching amplifier * Class D fire extinguisher * Class D league, a classification of minor league baseball from 1902 to 1962 * Class D star, a stellar classification * Class D, IP addresses on a classful network * Class D, an airspace class as defined by the ICAO * Class D, a type of Driver's license in the United States * Class D, a North American broadcast station class * Class-D, a type of character in the video game ''SCP – Containment Breach'' See also * D class (other) * D (other) D is the fourth letter of the Latin alphabet. D or d may also refer to: Places * D River, in Oregon, US * Detroit, US (nickname "D") People with the name * D, the bass player for Australian band Testeagles * "D!" or "Dee!", names of Detlef So ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Class-D Amplifier
A class-D amplifier or switching amplifier is an electronic amplifier in which the amplifying devices (transistors, usually MOSFETs) operate as electronic switches, and not as linear gain devices as in other amplifiers. They operate by rapidly switching back and forth between the supply rails, being fed by a modulator using pulse width, pulse density, or related techniques to encode the audio input into a pulse train. The audio passes through a simple low-pass filter into the loudspeaker. The high-frequency pulses are blocked. Since the pairs of output transistors are never conducting at the same time, there is no other path for current flow apart from the low-pass filter/loudspeaker. For this reason, efficiency can exceed 90%. History The first Class-D amplifier was invented by British scientist Alec Reeves in the 1950s and was first called by that name in 1955. The first commercial product was a kit module called the X-10 released by Sinclair Radionics in 1964. Howev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Class D Fire Extinguisher
A fire extinguisher is a handheld active fire protection device usually filled with a dry or wet chemical used to extinguish or control small fires, often in emergencies. It is not intended for use on an out-of-control fire, such as one which has reached the ceiling, endangers the user (i.e., no escape route, smoke, explosion hazard, etc.), or otherwise requires the equipment, personnel, resources, and/or expertise of a fire brigade. Typically, a fire extinguisher consists of a hand-held cylindrical pressure vessel containing an agent that can be discharged to extinguish a fire. Fire extinguishers manufactured with non-cylindrical pressure vessels also exist but are less common. There are two main types of fire extinguishers: stored-pressure and cartridge-operated. In stored pressure units, the expellant is stored in the same chamber as the firefighting agent itself. Depending on the agent used, different propellants are used. With dry chemical extinguishers, nitrogen is typic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Class D Star
In astronomy, stellar classification is the classification of stars based on their spectral characteristics. Electromagnetic radiation from the star is analyzed by splitting it with a prism or diffraction grating into a spectrum exhibiting the rainbow of colors interspersed with spectral lines. Each line indicates a particular chemical element or molecule, with the line strength indicating the abundance of that element. The strengths of the different spectral lines vary mainly due to the temperature of the photosphere, although in some cases there are true abundance differences. The ''spectral class'' of a star is a short code primarily summarizing the ionization state, giving an objective measure of the photosphere's temperature. Most stars are currently classified under the Morgan–Keenan (MK) system using the letters ''O'', ''B'', ''A'', ''F'', ''G'', ''K'', and ''M'', a sequence from the hottest (''O'' type) to the coolest (''M'' type). Each letter class is then subdivided ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Classful Network
A classful network is an obsolete network addressing architecture used in the Internet from 1981 until the introduction of Classless Inter-Domain Routing (CIDR) in 1993. The method divides the IP address space for Internet Protocol version 4 (IPv4) into five address classes based on the leading four address bits. Classes A, B, and C provide unicast addresses for networks of three different network sizes. Class D is for multicast networking and the class E address range is reserved for future or experimental purposes. Since its discontinuation, remnants of classful network concepts have remained in practice only in limited scope in the default configuration parameters of some network software and hardware components, most notably in the default configuration of subnet masks. Background In the original address definition, the most significant eight bits of the 32-bit IPv4 address was the ''network number'' field which specified the particular network a host was attached to. The re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Airspace Class
The world's navigable airspace is divided into three-dimensional segments, each of which is assigned to a specific class. Most nations adhere to the classification specified by the International Civil Aviation Organization (ICAO) and described below, though they might use only some of the classes defined below, and significantly alter the exact rules and requirements. Similarly, individual nations may also designate special use airspace (SUA) with further rules for reasons of national security or safety. Abbreviations used in this article ICAO definitions On March 12, 1990, ICAO adopted the current airspace classification scheme. The classes are fundamentally defined in terms of flight rules and interactions between aircraft and air traffic control (ATC). Generally speaking, the ICAO airspaces allocate the responsibility for avoiding other aircraft, namely either to ATC (if separation is provided) or to the aircraft commander (if not). Some key concepts are: * Separation: Mai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Driver's License In The United States
In the United States, driver's licenses are issued by each individual state, territory, and the District of Columbia rather than by the federal government due to federalism. Drivers are normally required to obtain a license from their state of residence and all states recognize each other's licenses for non-resident age requirements. There are also licenses for motorcycle use. Generally, a minimum age of 16 is required to obtain a driver's or motorcycle license, and 18 for a commercial driver's license which is required for operating heavy size vehicles ( buses, trucks, tractor-trailers) or vehicles with at least 16 passengers or hazardous materials. A state may also suspend an individual's driving privilege within its borders for traffic violations. Many states share a common system of license classes, with some exceptions, e.g. commercial license classes are standardized by federal regulation at . Many driving permits and ID cards display small digits next to each data field. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of North American Broadcast Station Classes
This is a list of broadcast station classes applicable in much of North America under international agreements between the United States, Canada and Mexico. Effective radiated power (ERP) and height above average terrain (HAAT) are listed unless otherwise noted. All radio and television stations within of the US-Canada or US-Mexico border must get approval by both the domestic and foreign agency. These agencies are Industry Canada/Canadian Radio-television and Telecommunications Commission (CRTC) in Canada, the Federal Communications Commission (FCC) in the US, and the Federal Telecommunications Institute (IFT) in Mexico. AM Station class descriptions All domestic (United States) AM stations are classified as A, B, C, or D. * A (formerly I) — clear-channel stations — 10 kW to 50 kW, 24 hours. **Class A stations are only protected within a radius of the transmitter site. **The old Class I was divided into three: Class I-A, I-B and I-N. NARBA distinguishe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SCP – Containment Breach
''SCP – Containment Breach'' is an indie horror video game developed by Joonas "Regalis" Rikkonen based on fictional stories from the SCP Foundation collaborative writing wiki. The player takes the role of a human test subject, imprisoned in an underground testing facility devoted to containing and studying anomalous entities and artifacts known as SCPs. The goal of the game is to escape from the facility as the role of said test subject during a breach of these anomalies while also avoiding security teams that are sent in to contain them. The game has a procedurally generated play area featuring multiple anomalies from the SCP wiki. The game was released digitally on April 15, 2012, for download and was supported with digital content updates until its most recent update 1.3.11 on July 29, 2018. Gameplay The player controls a prisoner named D-9341 as they attempt to escape an underground research and containment facility amidst a breach of its numerous anomalies, known as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
D Class (other)
D class may refer to: Ships * D-class cruiser (Germany), a pair of proposed cruisers * D-class cruiser (United Kingdom), British light cruisers that served during World War II * D-class lifeboat, British lifeboats * D-class destroyer (other), several classes of ships * British D-class submarine * United States D-class submarine * D-class ferry, roll-on/roll-off ferries operated by DFDS Seaways Rail vehicles Australia * MRWA D class, 2-8-0 type steam locomotives * WAGR D class, 4-6-4T tank locomotive * WAGR D class (1884), 0-4-0ST tank locomotives * WAGR D class (diesel), diesel locomotives * D-class Melbourne tram * Sydney D-Class Tram India * DHR D Class, 0-4-0+0-4-0 Garratt-type articulated steam locomotives New Zealand * NZR D class (1874), 33 2-4-0T tank locomotives * NZR D class (1929), 1 experimental 0-4-0T locomotives United Kingdom * Metropolitan Railway D Class, tank engines * NBR D class 0-6-0T, tank locomotives * LNWR Class D, 0-8-0 steam locomotives * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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