|
SRS Aviation
SRS or SrS may stand for: Organizations and companies * Savez Radio-Amatera Srbije, a Serbian amateur radio organization * Sea Research Society, for diving and underwater archaeology * Serbian Radical Party (''Srpska radikalna stranka''), a political party in Serbia * Special Repair Service, a British construction organization in World War II * Stanford Research Systems, a test and measurement instruments manufacturer * Scoliosis Research Society * Socialist Revolutionary Party, or "Essers", from the late Imperial and early Soviet periods * Society for Renaissance Studies, a UK-based academic society * Spanish Riding School, an Austrian equestrian institution * Sperry Rail Service, a rail inspection contractor * SRS Cinemas, in India * SRS Labs, an American audio technology engineering company * Surveillance and Response Support, a unit of the European Centre for Disease Prevention and Control * Southwick Regional School, a public high school in Massachusetts, United State ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Savez Radio-Amatera Srbije
The Savez radio-amatera Srbije (SRS) (in English language, English, Amateur Radio Union of Serbia) is a national non-profit organization for amateur radio enthusiasts in Serbia. Key membership benefits of SRS include the sponsorship of amateur radio operating awards and radio contesting, contests, and a QSL card, QSL bureau for those members who regularly communicate with amateur radio operators in other countries. SRS represents the interests of Serbian amateur radio operators before national, European, and international telecommunications regulatory authorities.Savez Radio-Amatera Srbije (2008)Savez radio-amatera Srbijeofficial website. Retrieved Aug. 14, 2008. SRS is the national member society representing Serbia in the International Amateur Radio Union.International Amateur Radio Union (2008)"Member Societies" Retrieved Aug. 1, 2008. List of SRS members, with their published info such as QTH locator, photo, etc. can be queried aYU Callbook See also *International Amateur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Slow-reacting Substance Of Anaphylaxis
The slow-reacting substance of anaphylaxis or SRS-A is a mixture of the leukotrienes LTC4, LTD4 and LTE4. Mast cells secrete it during the anaphylactic reaction, inducing inflammation. It can be found in basophils. It induces prolonged, slow contraction of smooth muscle and has a major bronchoconstrictor role in asthma. Compared to histamine Histamine is an organic nitrogenous compound involved in local immune responses, as well as regulating physiological functions in the gut and acting as a neurotransmitter for the brain, spinal cord, and uterus. Since histamine was discovered in ..., it is approximately 1000 times more potent and has a slower onset but longer duration of action. References External links * Allergology {{Biochem-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stratified Sampling
In statistics, stratified sampling is a method of sampling from a population which can be partitioned into subpopulations. In statistical surveys, when subpopulations within an overall population vary, it could be advantageous to sample each subpopulation (stratum) independently. Stratification is the process of dividing members of the population into homogeneous subgroups before sampling. The strata should define a partition of the population. That is, it should be ''collectively exhaustive'' and ''mutually exclusive'': every element in the population must be assigned to one and only one stratum. Then simple random sampling is applied within each stratum. The objective is to improve the precision of the sample by reducing sampling error. It can produce a weighted mean that has less variability than the arithmetic mean of a simple random sample of the population. In computational statistics, stratified sampling is a method of variance reduction when Monte Carlo methods are us ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Simple Random Sample
In statistics, a simple random sample (or SRS) is a subset of individuals (a sample) chosen from a larger set (a population) in which a subset of individuals are chosen randomly, all with the same probability. It is a process of selecting a sample in a random way. In SRS, each subset of ''k'' individuals has the same probability of being chosen for the sample as any other subset of ''k'' individuals. A simple random sample is an unbiased sampling technique. Simple random sampling is a basic type of sampling and can be a component of other more complex sampling methods. Introduction The principle of simple random sampling is that every set of items has the same probability of being chosen. For example, suppose ''N'' college students want to get a ticket for a basketball game, but there are only ''X'' < ''N'' tickets for them, so they decide to have a fair way to see who gets to go. Then, everybody is given a number in the range from 0 to ''N''-1, and random numbers are generated, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Synchrotron Radiation Source
The Synchrotron Radiation Source (SRS) at the Daresbury Laboratory in Cheshire, England was the first second-generation synchrotron radiation source to produce X-rays. The research facility provided synchrotron radiation to a large number of experimental stations and had an operating cost of approximately £20 million per annum. SRS had been operated by the Science and Technology Facilities Council. The SRS was closed on 4 August 2008 after 28 years of operation. History Following the closure of the NINA synchrotron, construction of the facility commenced in 1975 and the first experiments were completed using the facility by 1981. In 1986 the storage ring was upgraded with additional focusing to increase the output brightness, the new 'lattice' being termed the HBL (High Brightness Lattice). Design and evolution Like all second-generation sources, the SRS was designed to produce synchrotron radiation principally from its dipole magnets, but the initial design foresaw the use of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Strontium Sulfide
Strontium sulfide is the inorganic compound with the formula Sr S. It is a white solid. The compound is an intermediate in the conversion of strontium sulfate, the main strontium ore called celestite (or, more correctly, celestine), to other more useful compounds.J. Paul MacMillan, Jai Won Park, Rolf Gerstenberg, Heinz Wagner, Karl Köhler, Peter Wallbrecht “Strontium and Strontium Compounds” in Ullmann's Encyclopedia of Industrial Chemistry 2002, Wiley-VCH, Weinheim. . Production and reactions Strontium sulfide is produced by roasting celestine with coke at 1100–1300 °C. The sulfate is reduced, leaving the sulfide: :SrSO4 + 2 C → SrS + 2 CO2 About 300,000 tons are processed in this way annually. Both luminous and nonluminous sulfide phases are known, impurities, defects, and dopants being important.R. Ward, R. K. Osterheld, R. D. Rosenstein "Strontium Sulfide and Selenide Phosphors" Inorganic Syntheses, 1950, vol. III, pp. 11–24. As expected for a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
String Rewriting System
In theoretical computer science and mathematical logic a string rewriting system (SRS), historically called a semi- Thue system, is a rewriting system over strings from a (usually finite) alphabet. Given a binary relation R between fixed strings over the alphabet, called rewrite rules, denoted by s\rightarrow t, an SRS extends the rewriting relation to all strings in which the left- and right-hand side of the rules appear as substrings, that is usv\rightarrow utv, where s, t, u, and v are strings. The notion of a semi-Thue system essentially coincides with the presentation of a monoid. Thus they constitute a natural framework for solving the word problem for monoids and groups. An SRS can be defined directly as an abstract rewriting system. It can also be seen as a restricted kind of a term rewriting system. As a formalism, string rewriting systems are Turing complete. The semi-Thue name comes from the Norwegian mathematician Axel Thue, who introduced systematic treatment of strin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stimulated Raman Spectroscopy
Stimulated Raman spectroscopy, also referred to as stimulated Raman scattering (SRS) is a form of spectroscopy employed in physics, chemistry, biology, and other fields. The basic mechanism resembles that of spontaneous Raman spectroscopy: a pump photon, of the angular frequency \omega_p, which is scattered by a molecule has some small probability of inducing some vibrational (or rotational) transition, as opposed to inducing a simple Rayleigh transition. This makes the molecule emit a photon at a shifted frequency. However, SRS, as opposed to spontaneous Raman spectroscopy, is a third-order non-linear phenomenon involving a second photon—the Stokes photon of angular frequency \omega_S—which stimulates a specific transition. When the difference in frequency between both photons (\omega_p-\omega_S) resembles that of a specific vibrational (or rotational) transition (\omega_\nu) the occurrence of this transition is resonantly enhanced. In SRS, the signal is equivalent to changes in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spontaneous Raman Spectroscopy
Raman spectroscopy () (named after Indian physicist C. V. Raman) is a spectroscopic technique typically used to determine vibrational modes of molecules, although rotational and other low-frequency modes of systems may also be observed. Raman spectroscopy is commonly used in chemistry to provide a structural fingerprint by which molecules can be identified. Raman spectroscopy relies upon inelastic scattering of photons, known as Raman scattering. A source of monochromatic light, usually from a laser in the visible, near infrared, or near ultraviolet range is used, although X-rays can also be used. The laser light interacts with molecular vibrations, phonons or other excitations in the system, resulting in the energy of the laser photons being shifted up or down. The shift in energy gives information about the vibrational modes in the system. Infrared spectroscopy typically yields similar yet complementary information. Typically, a sample is illuminated with a laser beam. Electrom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shock Response Spectrum
A Shock Response Spectrum (SRS) Acronym is a graphical representation of a , or any other transient acceleration input, in terms of how a Single Degree Of Freedom (SDOF) system (like a mass on a spring) would respond to that input. The horizontal axis shows the natural frequency of a hypothetical SDOF, and the vertical axis shows the peak acceleration which this SDOF would undergo as a consequence of the shock input.Explanation Explanation Calculation The most direct and intuitive way to generate an SRS from a shock waveform is the following pro ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Slipping Rib Syndrome
Slipping rib syndrome (SRS) is a condition in which the interchondral ligaments are weakened or disrupted and have increased laxity, causing the costal cartilage tips to subluxate (partially dislocate). This results in pain or discomfort due to pinched or irritated intercostal nerves, straining of the intercostal muscles, and inflammation. The condition affects the 8th, 9th, and 10th ribs, referred to as the false ribs, with the 10th rib most commonly affected. Slipping rib syndrome was first described by Edgar Ferdinand Cyriax in 1919; however, the condition is rarely recognized and frequently overlooked. A study estimated the prevalence of the condition to be 1% of clinical diagnoses in a general medicine clinic and 5% in a gastroenterology clinic, with a separate study finding it to be 3% in a mixed specialty general medicine and gastroenterology clinic. The condition has also been referred to as Cyriax syndrome, clicking rib syndrome, painful rib syndrome, interchondral ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stereotactic Radiosurgery
Stereotactic surgery is a minimally invasive form of surgical intervention that makes use of a three-dimensional coordinate system to locate small targets inside the body and to perform on them some action such as ablation, biopsy, lesion, injection, stimulation, implantation, radiosurgery (SRS), etc. In theory, any organ system inside the body can be subjected to stereotactic surgery. However, difficulties in setting up a reliable frame of reference (such as bone landmarks, which bear a constant spatial relation to soft tissues) mean that its applications have been, traditionally and until recently, limited to brain surgery. Besides the brain, biopsy and surgery of the breast are done routinely to locate, sample (biopsy), and remove tissue. Plain X-ray images (radiographic mammography), computed tomography, and magnetic resonance imaging can be used to guide the procedure. Another accepted form of "stereotactic" is "stereotaxic". The word roots are '' stereo-'', a prefix der ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
