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F-1 French Grenade
F1 is Formula One, the highest class of auto racing sanctioned by the FIA. F1, F01, F.I, F.1 or F-1 may refer to: Computing * F1, a computer Function key * F1, an Office Assistant in Microsoft Office * F1 Magazine, a Syrian monthly computer magazine published in Arabic * Google F1, Google's SQL database management system (DBMS) * Oppo F1, a smartphone by Oppo Electronics Military craft and weapons * F1 grenade (other), several types of hand grenade * F 1 Hässlö, a former Swedish Air Force wing * F1 SMG, an Australian submachine gun * Dassault Mirage F1, a French combat aircraft * FCM F1, a 1940 French super-heavy tank * Fokker F.I, a German fighter triplane * HMS ''F1'', an F-class submarine of the Royal Navy, launched in 1915 * HMS ''Kelly'' (F01), a 1938 British Royal Navy K-class destroyer * Kampfgeschwader 76, from its historic ''Geschwaderkennung'' code with the Luftwaffe in World War II * Mitsubishi F-1, a fighter/attack aircraft of the Japan Air Sel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Formula One
Formula One (also known as Formula 1 or F1) is the highest class of international racing for open-wheel single-seater formula racing cars sanctioned by the Fédération Internationale de l'Automobile (FIA). The World Drivers' Championship, which became the FIA Formula One World Championship in 1981, has been one of the premier forms of racing around the world since its inaugural season in 1950. The word ''formula'' in the name refers to the set of rules to which all participants' cars must conform. A Formula One season consists of a series of races, known as ''Grands Prix'', which take place worldwide on both purpose-built circuits and closed public roads. A points system is used at Grands Prix to determine two annual World Championships: one for drivers, the other for constructors. Each driver must hold a valid Super Licence, the highest class of racing licence issued by the FIA. The races must run on tracks graded "1" (formerly "A"), the highest grade-rating issued ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North American F-1 Fury ...
#REDIRECT North American FJ Fury North American FJ Fury (also ''North American F-1 Fury'') may refer to several members of a group of fighter and fighter-bomber aircraft, built by North American Aviation for the US Navy, and related in varying degrees to the F-86 Sabre this firm p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Formant
In speech science and phonetics, a formant is the broad spectral maximum that results from an acoustic resonance of the human vocal tract. In acoustics, a formant is usually defined as a broad peak, or local maximum, in the spectrum. For harmonic sounds, with this definition, the formant frequency is sometimes taken as that of the harmonic that is most augmented by a resonance. The difference between these two definitions resides in whether "formants" characterise the production mechanisms of a sound or the produced sound itself. In practice, the frequency of a spectral peak differs slightly from the associated resonance frequency, except when, by luck, harmonics are aligned with the resonance frequency. A room can be said to have formants characteristic of that particular room, due to its resonances, i.e., to the way sound reflects from its walls and objects. Room formants of this nature reinforce themselves by emphasizing specific frequencies and absorbing others, as exploited ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fujita Scale
The Fujita scale (F-Scale; ), or Fujita–Pearson scale (FPP scale), is a scale for rating tornado intensity, based primarily on the damage tornadoes inflict on human-built structures and vegetation. The official Fujita scale category is determined by meteorologists and engineers after a ground or aerial damage survey, or both; and depending on the circumstances, ground-swirl patterns (cycloidal marks), weather radar data, witness testimonies, media reports and damage imagery, as well as photogrammetry or videogrammetry if motion picture recording is available. The Fujita scale was replaced with the Enhanced Fujita scale (EF-Scale) in the United States in February 2007. In April 2013, Canada adopted the EF-Scale over the Fujita scale along with 31 "Specific Damage Indicators" used by Environment Canada (EC) in their ratings. Background The scale was introduced in 1971 by Ted Fujita of the University of Chicago, in collaboration with Allen Pearson, head of the National Sev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vascular Dementia
Vascular dementia (VaD) is dementia caused by problems in the supply of blood to the brain, typically a series of minor strokes, leading to worsening cognitive abilities, the decline occurring piecemeal. The term refers to a syndrome consisting of a complex interaction of cerebrovascular disease and risk factors that lead to changes in brain structures due to strokes and lesions, resulting in changes in cognition. The temporal relationship between a stroke and cognitive deficits is needed to make the diagnosis. ICD-11 lists vascular dementia as dementia due to cerebrovascular disease. DSM-5 lists vascular dementia as either major or mild vascular neurocognitive disorder. Signs and symptoms Differentiating dementia syndromes can be challenging, due to the frequently overlapping clinical features and related underlying pathology. Mixed dementia, involving two types of dementia can occur, in particular, Alzheimer's disease often co-occurs with vascular dementia. People with v ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
F-1 Cubesat
F-1 is a CubeSat built by FSpace laboratory at FPT University, in Hanoi, Vietnam, in partnership with Angstrom Space Technology Center (ASTC), Uppsala University, Sweden and Nanoracks LLC, United States. Its mission is to train young engineers and students about aerospace engineering and evaluate an advanced three-axis magnetometer, Spin-Dependent Tunneling Magnetometer (SDTM) designed in Sweden by ASTC. F-1 was launched on 21 July 2012 and delivered to the International Space Station (ISS) aboard Kounotori 3 (HTV-3) along with the RAIKO, WE WISH, Niwaka and TechEdSat-1 cubesats. Then, on 4 October 2012, it was deployed into orbit from the ISS using the JEM-Small Satellite Orbital Deployer (J-SSOD) which was attached to the Kibō module's robotic arm. As of 2 November 2012, F-1 failed to confirm communication after the orbital deployment. Hardware * Structure: aluminium alloy T-6061 * Power supply: body-mounted solar cells, rechargeable Li-Polymer battery * PIC16 and P ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
F1 Score
In statistical analysis of binary classification, the F-score or F-measure is a measure of a test's accuracy. It is calculated from the precision and recall of the test, where the precision is the number of true positive results divided by the number of all positive results, including those not identified correctly, and the recall is the number of true positive results divided by the number of all samples that should have been identified as positive. Precision is also known as positive predictive value, and recall is also known as sensitivity in diagnostic binary classification. The F1 score is the harmonic mean of the precision and recall. The more generic F_\beta score applies additional weights, valuing one of precision or recall more than the other. The highest possible value of an F-score is 1.0, indicating perfect precision and recall, and the lowest possible value is 0, if either precision or recall are zero. Etymology The name F-measure is believed to be named after ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
F1 Layer
The F region of the ionosphere is home to the F layer of ionization, also called the Appleton–Barnett layer, after the English physicist Edward Appleton and New Zealand physicist and meteorologist Miles Barnett. As with other ionospheric sectors, 'layer' implies a concentration of plasma, while 'region' is the volume that contains the said layer. The F region contains ionized gases at a height of around 150–800 km (100 to 500 miles) above sea level, placing it in the Earth's thermosphere, a hot region in the upper atmosphere, and also in the heterosphere, where chemical composition varies with height. Generally speaking, the F region has the highest concentration of free electrons and ions anywhere in the atmosphere. It may be thought of as comprising two layers, the F1 and F2 layers. The F-region is located directly above the E region (formerly the Kennelly-Heaviside layer) and below the protonosphere. It acts as a dependable reflector of HF radio signals as it is not aff ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
F1-isoprostane
The isoprostanes are prostaglandin-like compounds formed ''in vivo'' from the free radical-catalyzed peroxidation of essential fatty acids (primarily arachidonic acid) without the direct action of cyclooxygenase (COX) enzymes. The compounds were discovered in 1990 by L. Jackson Roberts and Jason D. Morrow in the Division of Clinical Pharmacology at Vanderbilt University. These nonclassical eicosanoids possess potent biological activity as inflammatory mediators that augment the perception of pain. These compounds are accurate markers of lipid peroxidation in both animal and human models of oxidative stress. Elevated levels of isoprostanes are suspected of contributing to increased risk of heart attack in patients taking Coxibs. Isoprostanes and their metabolites have also been shown to be elevated in the urine of cigarette smokers, and have been suggested as biomarkers of oxidative stress in smokers. Abundance Polyunsaturated fatty acids other than arachidonic acid are a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
F1 Hybrid
An F1 hybrid (also known as filial 1 hybrid) is the first filial generation of offspring of distinctly different parental types. F1 hybrids are used in genetics, and in selective breeding, where the term F1 crossbreed may be used. The term is sometimes written with a subscript, as F hybrid. Subsequent generations are called F, F, etc. The offspring of distinctly different parental types produce a new, uniform phenotype with a combination of characteristics from the parents. In fish breeding, those parents frequently are two closely related fish species, while in plant and animal breeding, the parents often are two inbred lines. Gregor Mendel focused on patterns of inheritance and the genetic basis for variation. In his cross-pollination experiments involving two true-breeding, or homozygous, parents, Mendel found that the resulting F1 generation was heterozygous and consistent. The offspring showed a combination of the phenotypes from each parent that were genetically dominant. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
FR F1
The FR F1 is a French sniper rifle manufactured by the Manufacture d'armes de Saint-Étienne (''MAS''); one of several government-owned arms factories in France. The FR F1 was France's first purpose-built precision rifle for sharpshooters. Introduced in 1966, the rifle was in use with the French Armed Forces until 1989 when it was replaced by the FR F2. History In 1964, General Charles Ailleret requested the creation of a precision rifle to the General Staff of the Army. Development was entrusted to the Saint-Étienne arms factory, which took input from sports shooters in both the military and the civilian French Shooting Federation. After several prototypes named the FR-P series, the new weapon was ready in 1966 and adopted as the FR F1. Around 6000 rifles were produced by 1980. Design The original intention of the FR F1 was the creation of an accurized MAS-36, using as many parts from the older rifle as possible. As such, the FR F1 was originally designed around the 7.5 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Avion MAI F-1
F-1 ''Favorit'' ( en, Ф-1 «Фаворит») is a light sporting biplane for aerobatics, a modernized version of B2M Mosquit. It was designed and built by the Avion Group together with Moscow Aviation Institute specialists. Specifications (MAI F-1) References External links Avion F-1 Favoritat airliners.net Airliners.net is an aviation website that includes an extensive photo database of aircraft and airports, as well as a forum catering to aviation enthusiasts. Created by Johan Lundgren, Jr., the site originated in 1996 as ''Pictures of Modern Air ... Russian sources *F-1*** {{DEFAULTSORT:Avion Mai F-1 2000s Russian sport aircraft Biplanes Single-engined tractor aircraft Aircraft first flown in 2006 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
