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PTR Rifle, PTR-91
PTR can refer to: * Particle transfer roller, for cleaning motion picture film * Peak-to-trough ratio, a parameter in pharmacokinetics * Petir LRT station (LRT station abbreviation), Singapore * PetroChina (NYSE: PTR) * Photothermal Ratio, light/temperature ratio for a plant * Physical transmission right in the electricity market * Physikalisch-Technische Reichsanstalt, later Physikalisch-Technische Bundesanstalt, a German research institute * Pitrilysin, an enzyme * Planar ternary ring in algebra * Pool Test Reactor, Canada * Proton-transfer-reaction mass spectrometry, used in chemical analysis * PTR rifle, made by PTR Industries, Inc., US * A type of DNS record in computer networking * Pointer in computer programming (e.g. the PTR keyword in x86 assembly language) * Palanivel Thiagarajan Palanivel Thiagarajan (PTR) is an Indian politician and the current Finance Minister of Tamil Nadu. He was elected to the Tamil Nadu Legislative Assembly election in 2016 and 2021 fr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Particle Transfer Roller
The particle transfer roller, often abbreviated to PTR, is a device for cleaning motion picture film. It consists of a cylindrical roller coated with urethane, over which the surface of the film passes. History The particle transfer roller was developed by Eastman Kodak and launched in 1989. It was intended to replace the organic solvents that were the main method of film cleaning before that point. Although their effectiveness is not usually considered sufficient for lab operations, where ultrasonic cleaning with a solvent solution remains the standard, the PTR sold widely for use in projection booths and transfer houses. Use At least two PTRs are needed in the film path – one for the base side and one for the emulsion side – though four are frequently used. A set of PTRs is frequently placed in the film paths of projectors, telecine machines, scanners and printers Printer may refer to: Technology * Printer (publishing), a person or a company * Printer (computing), a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peak-to-trough Ratio
Peak-to-trough ratio (PTR), also known as peak-to-trough variation or peak-to-trough fluctuation, is a parameter in pharmacokinetics which is defined as the ratio of Cmax (peak) concentration and Cmin (trough) concentration over a dosing interval for a given drug. A drug with an elimination half-life Biological half-life (also known as elimination half-life, pharmacologic half-life) is the time taken for concentration of a biological substance (such as a medication) to decrease from its maximum concentration ( Cmax) to half of Cmax in the bl ... of 24 hours taken once per day will have a peak-to-trough ratio of approximately 2. Peak-to-trough ratio is proportional to half-life and to dosing interval, with longer half-lives and shorter dosing intervals giving smaller ratios. References Pharmacokinetic metrics {{Pharmacology-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Petir LRT Station
The Bukit Panjang LRT (BPLRT) is a automated guideway transit line in Bukit Panjang, Singapore. The BPLRT is currently the only LRT line operated by SMRT Trains. As the name suggests, it serves 13 stations in the neighbourhood of Bukit Panjang and parts of Choa Chu Kang in the north-west of the country. The line was the first LRT line constructed in Singapore, having opened on 6 November 1999 by then Deputy Prime Minister Tony Tan. It is a fully elevated and automated people mover system. The line currently uses the Innovia APM 100 C801 and C801A rolling stock supplied by Bombardier, running in a two-car formation. With a 20-year design lifespan, a major overhaul of the system began in 2019 that is scheduled to complete in 2026, which include a new signalling and power rails system, as well as rolling stock. History Planning and construction In November 1994, then-Communication Minister Mah Bow Tan announced that the Mass Rapid Transit Corporation (MRTC) was conducting stu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PetroChina
PetroChina Company Limited () is a Chinese oil and gas company and is the listed arm of state-owned China National Petroleum Corporation (CNPC), headquartered in Dongcheng District, Beijing. The company is currently Asia's largest oil and gas producer and was China's second biggest oil producer in 2006. Traded in Hong Kong and New York, the mainland enterprise announced its plans to issue stock in Shanghai in November 2007,Analysts express optimism about Chinese shares (Xinhuanet.com, with source from ''Shanghai Daily'') and subsequently entered the constituent of SSE 50 Index. In the 2020 |
Physical Transmission Right
Electricity transmission congestion is a condition of the electrical grid that prevents the accepted or forecasted load schedules from being implemented due to the grid configuration and equipment performance limitations. In simple terms, congestion occurs when overloaded transmission lines are unable to carry additional electricity flow due to the risk of overheating and the transmission system operator (TSO) has to direct the providers to adjust their dispatch levels to accommodate the constraint or in an electricity market a power plant can produce electricity at a competitive price but cannot transmit the power to a willing buyer. Congestion increases the electricity prices for some customers. Definitions There is no universally accepted definition of the transmission congestion. Congestion is not an event, so it is frequently not possible to pinpoint its place and time (in this respect it is similar to traffic congestion). Regulators define congestion as a condition that pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Physikalisch-Technische Reichsanstalt
The Physikalisch-Technische Bundesanstalt (PTB) is the national metrology institute of the Federal Republic of Germany, with scientific and technical service tasks. It is a higher federal authority and a public-law institution directly under federal government control, without legal capacity, under the auspices of the Federal Ministry for Economic Affairs and Energy. Tasks Together with NIST in the USA and the National Physical Laboratory (United Kingdom), NPL in Great Britain, PTB ranks among the leading metrology institutes in the world. As the National Metrology Institute of Germany, PTB is Germany's highest and only authority in terms of correct and reliable measurements. The Units and Time Act Bundesgesetzblatt (Germany), Bundesgesetzblatt (Federal Law Gazette), volume 2008, part I, No. 28, p. 1185 ff., 11 July 2008] assigns all tasks which are related with the realization and dissemination of the units to PTB. All legally relevant aspects regarding the units as well ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pitrilysin
Pitrilysin (, ''Escherichia coli protease III'', ''protease Pi'', ''proteinase Pi'', ''PTR'', ''Escherichia coli metalloproteinase Pi'') is an enzyme. This enzyme catalyses the following chemical reaction: : Preferential cleavage of -Tyr16- Leu- and -Phe25- Tyr-bonds of oxidized insulin B chain. Also acts on other substrates of less than 7 kDa such as glucagon This enzyme is present in bacteria ''Escherichia coli ''Escherichia coli'' (),Wells, J. C. (2000) Longman Pronunciation Dictionary. Harlow ngland Pearson Education Ltd. also known as ''E. coli'' (), is a Gram-negative, facultative anaerobic, rod-shaped, coliform bacterium of the genus ''Escher ...''. References External links * {{Portal bar, Biology, border=no EC 3.4.24 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Planar Ternary Ring
In mathematics, an algebraic structure (R,T) consisting of a non-empty set R and a ternary mapping T \colon R^3 \to R \, may be called a ternary system. A planar ternary ring (PTR) or ternary field is special type of ternary system used by Marshall Hall to construct projective planes by means of coordinates. A planar ternary ring is not a ring in the traditional sense, but any field gives a planar ternary ring where the operation T is defined by T(a,b,c) = ab + c. Thus, we can think of a planar ternary ring as a generalization of a field where the ternary operation takes the place of both addition and multiplication. In effect, in computer architecture, this ternary operation is known, e.g., as the multiply–accumulate operation (MAC). There is wide variation in the terminology. Planar ternary rings or ternary fields as defined here have been called by other names in the literature, and the term "planar ternary ring" can mean a variant of the system defined here. The term "ter ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pool Test Reactor
Pool Test Reactor (PTR) was a 10 kWt ordinary (light) water moderated pool-type reactor fueled with highly enriched uranium built at Chalk River in 1957. It used 93% enriched uranium-aluminum plate-type fuel. The reactor, was used for burnup measurement of fissile samples from NRX. The reactor was designed and built by Canadair. History On November 29, 1957 the reactor attained first criticality and shortly took over the function of ZEEP for measuring reactivity effects of materials, particularly after irradiation Irradiation is the process by which an object is exposed to radiation. The exposure can originate from various sources, including natural sources. Most frequently the term refers to ionizing radiation, and to a level of radiation that will serve .... It was shut down and defueled in 1990. External links Atomic Energy of Canada Limited {{authority control Atomic Energy of Canada Limited Nuclear research reactors ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Proton-transfer-reaction Mass Spectrometry
Proton-transfer-reaction mass spectrometry (PTR-MS) is an analytical chemistry technique that uses gas phase hydronium reagent ions which are produced in an ion source. PTR-MS is used for online monitoring of volatile organic compounds (VOCs) in ambient air and was developed in 1995 by scientists at the Institut für Ionenphysik at the Leopold-Franzens University in Innsbruck, Austria. A PTR-MS instrument consists of an ion source that is directly connected to a drift tube (in contrast to SIFT-MS no mass filter is interconnected) and an analyzing system (quadrupole mass analyzer or time-of-flight mass spectrometer). Commercially available PTR-MS instruments have a response time of about 100 ms and reach a detection limit in the single digit pptv or even ppqv region. Established fields of application are environmental research, food and flavor science, biological research, medicine, security, cleanroom monitoring, etc. Theory With H3O+ as the reagent ion the proton transfer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PTR Rifle
The PTR rifle is a family of modern, American-manufactured, semi-automatic rifles based on the Heckler & Koch G3 battle rifle. These rifles are produced by PTR Industries, Inc. of Aynor, South Carolina for the law enforcement and civilian markets in the United States. The abbreviation PTR stands for "Precision Target Rifle." History The weapon is based on the Heckler & Koch G3 and HK91 design, which itself is a variant of the Spanish-made CETME rifle. The United States Federal Assault Weapons Ban enacted in 1994, by President Bill Clinton, prohibited certain cosmetic features of the HK91, which meant that the HK91 and its variants could no longer be manufactured and sold to the US civilian market in their original configuration. Furthermore, German-made HK91s were specifically prohibited from importation under an import ban enacted by President George H. W. Bush in 1989. Subsequently, Heckler & Koch ceased manufacture of the semi-automatic G3-variant, the HK91. The PTR-91 w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
