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Augmented Reality
Augmented reality (AR) is an interactive experience that combines the real world and computer-generated content. The content can span multiple sensory Modality (human–computer interaction), modalities, including visual, Hearing, auditory, haptic perception, haptic, Somatosensory system, somatosensory and olfactory. AR can be defined as a system that incorporates three basic features: a combination of real and virtual worlds, real-time interaction, and accurate 3D registration of virtual and real objects. The overlaid sensory information can be constructive (i.e. additive to the natural environment), or destructive (i.e. masking of the natural environment). This experience is seamlessly interwoven with the physical world such that it is perceived as an immersion (virtual reality), immersive aspect of the real environment. In this way, augmented reality alters one's ongoing perception of a real-world environment, whereas virtual reality completely replaces the user's real-world e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Repair Ship
A repair ship is a naval auxiliary ship designed to provide maintenance support to warships. Repair ships provide similar services to destroyer, submarine and seaplane tenders or depot ships, but may offer a broader range of repair capability including equipment and personnel for repair of more significant machinery failures or battle damage.Lenton & Colledge, p.333 United States Navy The United States Navy became aware of the need for repair ships to maintain Asiatic Fleet ships stationed in the Philippines. Two colliers were converted to and in 1913 before the purpose-built was completed at the Puget Sound Navy Yard in 1923. Repair ships Repair ships: * Silverstone, p.292 * * * * * * * * Silverstone, p.293 * * * * * * Silverstone, p.296 * * * Silverstone, p.285 * * Internal combustion engine repair ship Internal combustion engine repair ships specializing in the maintenance and repair of gasoline engines and diesel engines. Common work was on PT boats ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Autoregressive Model
In statistics, econometrics and signal processing, an autoregressive (AR) model is a representation of a type of random process; as such, it is used to describe certain time-varying processes in nature, economics, etc. The autoregressive model specifies that the output variable depends linearly on its own previous values and on a stochastic term (an imperfectly predictable term); thus the model is in the form of a stochastic difference equation (or recurrence relation which should not be confused with differential equation). Together with the moving-average (MA) model, it is a special case and key component of the more general autoregressive–moving-average (ARMA) and autoregressive integrated moving average (ARIMA) models of time series, which have a more complicated stochastic structure; it is also a special case of the vector autoregressive model (VAR), which consists of a system of more than one interlocking stochastic difference equation in more than one evolving random vari ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Toyota AR Engine
The AR engine family is an Inline-4 piston engine series by Toyota, first introduced in 2008 for the RAV4, and subsequently for the Highlander, Venza, Camry and Scion tC. The AR series uses a die-cast aluminium engine block and aluminium DOHC cylinder head. The engine series shares many of the technologies in the AZ engine, while incorporating new features such as variable valve timing on both intake and exhaust camshafts or dual VVT-i, low friction technologies including an offset crankshaft, roller rockers for the valvetrain, a three-stage variable oil pump, reduced-tension piston rings and auxiliary belt drive. An Acoustic Control Induction System switches the length of the intake tract in two stages, based on rpm and throttle angle, thereby ensuring strong torque across a broad engine speed range. New tumble control valves enhances combustion while the engine is cold, and helps to bring the catalytic converters up to working temperature quickly. The Tumble control valves, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Androgen Receptor
The androgen receptor (AR), also known as NR3C4 (nuclear receptor subfamily 3, group C, member 4), is a type of nuclear receptor that is activated by binding any of the androgenic hormones, including testosterone and dihydrotestosterone in the cytoplasm and then translocating into the nucleus. The androgen receptor is most closely related to the progesterone receptor, and progestins in higher dosages can block the androgen receptor. The main function of the androgen receptor is as a DNA-binding transcription factor that regulates gene expression; however, the androgen receptor has other functions as well. Androgen-regulated genes are critical for the development and maintenance of the male sexual phenotype. Function Effect on development In some cell types, testosterone interacts directly with androgen receptors, whereas, in others, testosterone is converted by 5-alpha-reductase to dihydrotestosterone, an even more potent agonist for androgen receptor activation. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acoustic Research
Acoustic Research was a Cambridge, Massachusetts-based company that manufactured high-end audio equipment. The brand is now owned by VOXX. Acoustic Research was known for the AR-3 series of speaker systems, which used the acoustic suspension woofer of the AR-1 with newly designed dome mid-range speaker and high-frequency drivers. AR's line of acoustic suspension speakers were the first loudspeakers with relatively flat response, extended bass, wide dispersion, small size, and reasonable cost. Company history Acoustic Research, Inc. (“AR”) was founded in 1954 by audio pioneer, writer, inventor, researcher and audio-electronics teacher Edgar Villchur and his student, Henry Kloss. AR was established to produce the $185 () model AR-1, a loudspeaker design incorporating the acoustic suspension principle based on , granted to Edgar Villchur and assigned to Acoustic Research in 1956. Edgar Villchur's technical innovation was based on objective testing and research, most of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aerolíneas Argentinas
Aerolíneas Argentinas, formally Aerolíneas Argentinas S.A., is Argentina's largest airline and the country flag carrier. The airline was created in 1949 from the merger of four companies and started operations in . A consortium led by Iberia took control of the airline in 1990, and Grupo Marsans acquired the company and its subsidiaries in 2001, following a period of severe financial difficulties that put the airline on the brink of closure. The company has been run by the Argentine government since late 2008, when the country regained control of the airline after it was taken over from the Spanish owners. , Aerolíneas Argentinas was state-owned. It has its headquarters in Buenos Aires. SkyTeam membership was achieved in late ; the airline's cargo division became a member of SkyTeam Cargo in . Aerolíneas Argentinas and its former sister company Austral Líneas Aéreas operates from two hubs, both located in Buenos Aires: Aeroparque Jorge Newbery and Ministro Pistarini In ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anti-reflective
An antireflective, antiglare or anti-reflection (AR) coating is a type of optical coating applied to the surface of lenses, other optical elements, and photovoltaic cells to reduce reflection. In typical imaging systems, this improves the efficiency since less light is lost due to reflection. In complex systems such as cameras, binoculars, telescopes, and microscopes the reduction in reflections also improves the contrast of the image by elimination of stray light. This is especially important in planetary astronomy. In other applications, the primary benefit is the elimination of the reflection itself, such as a coating on eyeglass lenses that makes the eyes of the wearer more visible to others, or a coating to reduce the glint from a covert viewer's binoculars or telescopic sight. Many coatings consist of transparent thin film structures with alternating layers of contrasting refractive index. Layer thicknesses are chosen to produce destructive interference in the beams ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aspect Ratio (aeronautics)
In aeronautics, the aspect ratio of a wing is the ratio of its span to its mean chord. It is equal to the square of the wingspan divided by the wing area. Thus, a long, narrow wing has a high aspect ratio, whereas a short, wide wing has a low aspect ratio.Kermode, A.C. (1972), ''Mechanics of Flight'', Chapter 3, (p.103, eighth edition), Pitman Publishing Limited, London Aspect ratio and other features of the planform are often used to predict the aerodynamic efficiency of a wing because the lift-to-drag ratio increases with aspect ratio, improving the fuel economy in powered airplanes and the gliding angle of sailplanes. Definition The aspect ratio \text is the ratio of the square of the wingspan b to the projected wing area S, which is equal to the ratio of the wingspan b to the standard mean chord \text: \text \equiv \frac = \frac Mechanism As a useful simplification, an airplane in flight can be imagined to affect a circular cylinder of air with a diameter equal to t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aortic Insufficiency
Aortic regurgitation (AR), also known as aortic insufficiency (AI), is the leaking of the aortic valve of the heart that causes blood to flow in the reverse direction during ventricular diastole, from the aorta into the left ventricle. As a consequence, the cardiac muscle is forced to work harder than normal. Signs and symptoms Symptoms of aortic regurgitation are similar to those of heart failure and include the following: * Dyspnea on exertion * Orthopnea * Paroxysmal nocturnal dyspnea * Palpitations * Angina pectoris * Cyanosis (in acute cases) Causes In terms of the cause of aortic regurgitation, is often due to the aortic root dilation (''annuloaortic ectasia''), which is idiopathic in over 80% of cases, but otherwise may result from aging, syphilitic aortitis, osteogenesis imperfecta, aortic dissection, Behçet's disease, reactive arthritis and systemic hypertension.Chapter 1: Diseases of the Cardiovascular system > Section: Valvular Heart Disease in: Aorti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alfa Romeo
Alfa Romeo Automobiles S.p.A. () is an Italian luxury car manufacturer and a subsidiary of Stellantis. The company was founded on 24 June 1910, in Milan, Italy. "Alfa" is an acronym of its founding name, "Anonima Lombarda Fabbrica Automobili." "Anonima" means "anonymous", which was a legal form of company at the time (Società anonima). In the initial set-up phase, in order to have a building to produce cars, the company bought the Portello factory building of Darracq in Milan, which was closing up and selling all its assets. The brand is known for sport-oriented vehicles and has been involved in car racing since 1911. Alfa Romeo was owned by Fiat Chrysler Automobiles, the company that was responsible for the production of Alfa Romeo cars until its operations were fully merged with those of the PSA Group to form Stellantis on 16 January 2021. The first car produced by the company was the 1910 24 HP, designed by Giuseppe Merosi. A.L.F.A. ventured into motor racing, with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Adelaide Review
''The Adelaide Review'' (AR) was a monthly print arts magazine and dynamic website in Adelaide, South Australia. It was first published in 1984, but gained standing after one of its writers, Christopher Pearson, took it over in 1985. In March 2019, it was one of only two "broad-spectrum non- Murdoch print media" publications in Adelaide, the other one being '' SA Life''. Its 488th and final issue was published in print and online on 1 October 2020. History ''The Adelaide Review'' existed in a number of forms since 1984, as both a magazine and a newspaper.''Advertising in The Adelaide Review'' , August 2004, The Adelaide Review Archives. Retrieved 2 Aug 2010. The first edition came out in March 1984. Christopher Pearson bought the rights to ''The Adelaide Preview'', ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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