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  • street-style skateboarding (sport)

    skateboarding: Street style features tricks performed in a real or simulated urban environment with stairs, rails, ledges, and other obstacles. Skateboarding has developed as a youth subculture that emphasizes creativity and individuality. It is an alternative to mainstream team sports, which are more formally organized and…

  • streetcar

    Streetcar, vehicle that runs on track laid in the streets, operated usually in single units and usually driven by electric motor. Early streetcars were either horse-drawn or depended for power on storage batteries that were expensive and inefficient. In 1834 Thomas Davenport, a blacksmith from

  • Streetcar Named Desire, A (play by Williams)

    A Streetcar Named Desire, play in three acts by Tennessee Williams, first produced and published in 1947 and winner of the Pulitzer Prize for drama for that year. One of the most admired plays of its time, it concerns the mental and moral disintegration and ultimate ruin of Blanche DuBois, a former

  • Streetcar Named Desire, A (film by Kazan [1951])

    A Streetcar Named Desire, American film drama, released in 1951, that made Marlon Brando a movie star and helped revolutionize acting in the mid-20th century. Adapted by Tennessee Williams from his Broadway play, the sexually charged saga centres on the marriage of Stella Kowalski (played by Kim

  • Streeter, Bess Genevra (American author)

    Bess Genevra Streeter Aldrich, American author whose prolific output of novels and short stories evoked the American Plains and the people who settled them. Bess Streeter graduated from Iowa State Teachers College (now the University of Northern Iowa) in 1901 and then taught school for five years.

  • Streeter, Burnett Hillman (British theologian)

    Burnett Hillman Streeter, English theologian and biblical scholar, noted for his original contributions to knowledge of Gospel origins. Educated at Queen’s College, University of Oxford, Streeter spent most of his life there, becoming chaplain in 1928 and provost in 1933. He was ordained in 1899

  • Streeton, Arthur (Australian artist)

    Australia: Visual arts: …own identity when Tom Roberts, Arthur Streeton, Frederick McCubbin, and others in the so-called Heidelberg school (named for the town outside Melbourne where they often painted) began to depict uniquely Australian subject matter, usually the landscape, in their plein-air canvases. This focus on the Australian landscape continued into the early…

  • Streets of Laredo, The (ballad)

    ballad: Occupational ballads: …with their proper work: “The Streets of Laredo,” for example, is known in lumberjack and soldier versions as well as the usual cowboy lament version, and the pirate ballad “The Flying Cloud” was much more popular in lumbermen’s shanties than in forecastles.

  • Streets of Philadelphia (recording by Springsteen)

    Bruce Springsteen: On his own: …eight years), the AIDS-related “Streets of Philadelphia,” from the film Philadelphia, for which he won both an Academy Award and a Grammy Award.

  • Streets of San Francisco, The (American television program)

    Michael Douglas: Early life and career: …on the popular television series The Streets of San Francisco (1972), costarring with veteran actor Karl Malden.

  • Streetwise (film by Brown [1998])

    Taraji P. Henson: …made her big-screen debut in Streetwise, and her breakthrough movie roles came in John Singleton’s Baby Boy (2001), as the central character’s much-put-upon girlfriend, and Hustle & Flow (2005), as the pregnant prostitute Shug, opposite Terrence Howard, whom she later demanded be hired to play the role of Lucious Lyon,…

  • Strehlenau, Nikolaus Franz Niembsch, Edler von (Austrian poet)

    Nikolaus Lenau, Austrian poet known for melancholy lyrical verse that mirrors the pessimism of his time as well as his personal despair. Severe depression and dissatisfaction characterized Lenau’s life. He began, but never completed, studies in law, medicine, and philosophy. A legacy in 1830

  • Strehler, Giorgio (Italian director)

    Giorgio Strehler, Italian theatre director and actor who was a preeminent figure in post-World War II European theatre as cofounder and artistic director (1947-68, 1972-97) of the Piccolo Teatro di Milano, Italy’s first important modern regional theatre; founding director (1968-72) of the Gruppo

  • Streichbogen (stringed instrument accessory)

    Bow, in music, curved stick with tightly held fibres that produces sound by friction when drawn across the strings of a chordophone, such as a rebab, violin, or erhu. The most common material is rosined horsehair; some African bows used strips cut from rubber inner tubes, and the Korean ajaeng, a

  • Streicher, Julius (German politician)

    Julius Streicher, Nazi demagogue and politician who gained infamy as one of the most virulent advocates of the persecution of Jews during the 1930s. Streicher served in the German army during World War I and afterward taught elementary school in Nürnberg. He joined the Nazi Party in 1921, becoming

  • Streisand, Barbara Joan (American actress, singer, director, producer)

    Barbra Streisand, American singer, composer, actress, director, and producer who was considered by many to be the greatest popular singer of her generation. The first major female star to command roles as a Jewish actress, Streisand redefined female stardom in the 1960s and ’70s with her sensitive

  • Streisand, Barbra (American actress, singer, director, producer)

    Barbra Streisand, American singer, composer, actress, director, and producer who was considered by many to be the greatest popular singer of her generation. The first major female star to command roles as a Jewish actress, Streisand redefined female stardom in the 1960s and ’70s with her sensitive

  • Streit um den Sergeanten Grischa, Der (work by Zweig)

    Arnold Zweig: …um den Sergeanten Grischa (1927; The Case of Sergeant Grischa).

  • Streitberg, Wilhelm August (German linguist)

    Wilhelm Streitberg, German historical linguist who, with Karl Brugmann, founded (1891) and edited Indogermanische Forschungen (“Indo-European Researches”), an influential journal in the field of Indo-European linguistic studies. Much of Streitberg’s scholarly work concerns comparative and

  • Streitschriften (work by Strauss)

    Hegelianism: Period of controversies chiefly in religion: 1831–39: …which he replied in his Streitschriften (1837–38; “Controversial Writings”), proposing the image of a Hegelian school split, like the French Parliament, into a right (G?schel, and several others), a centre (Rosenkranz), and a left (Strauss himself). There were responses from the right and centre and from Bruno Bauer, a philosopher,…

  • Strekalov, Gennady Mikhailovich (Russian cosmonaut)

    Gennady Mikhailovich Strekalov, Soviet and Russian cosmonaut who flew five times in space over a period of 15 years and who participated in the first joint Russian-American flight to the Mir space station. From 1957 Strekalov was a mechanic at the OKB-1 design organization (now known as RKK

  • strelets (Russian military unit)

    Streltsy, (Russian: “musketeer”), Russian military corps established in the middle of the 16th century that formed the bulk of the Russian army for about 100 years, provided the tsar’s bodyguard, and, at the end of the 17th century, exercised considerable political influence. Originally composed o

  • Strelitzia (plant genus)

    Strelitziaceae: >Strelitzia) and seven species.

  • Strelitzia augusta (plant)

    Strelitziaceae: …of the southern African genus Strelitzia look like palm trees. Others are herbs bearing exotic flowers (e.g., bird-of-paradise flower, S. reginae). S. augusta, which grows to more than 5 m (16 feet) in height, has banana-like fruit and resembles the traveller’s tree. In this family large flowers are enclosed in…

  • Strelitzia reginae (plant)

    Bird-of-paradise flower, ornamental plant of the family Strelitziaceae. There are five species of the genus Strelitzia, all native to southern Africa. They grow from rhizomes (underground stems) to a height of 1 to 1.5 metres (about 3 to 5 feet) and have stiff, erect, leathery, concave, and oblong

  • Strelitziaceae (plant family)

    Strelitziaceae, family of flowering plants in the ginger order (Zingiberales) that range in size from perennial herbs to trees. The family includes three genera (Ravenala, Phenakospermum, and Strelitzia) and seven species. R. madagascariensis, the traveler’s tree (q.v.), native to Madagascar, has

  • strelizzi, Gli (ballet by Viganò)

    Salvatore Viganò: In Gli strelizzi (1809) and subsequent ballets, he further developed Noverre’s dance-drama approach by combining conventional dance patterns with pantomime, whereas Noverre had stopped at the alternation of such sequences. Among Viganò’s more than 40 ballets were Die Gesch?pfe des Prometheus (1801; The Creatures of Prometheus),…

  • Strelka (architectural complex, Saint Petersburg, Russia)

    St. Petersburg: Vasilyevsky Island: …architectural complex known as the Strelka (“Pointer”), facing the bifurcation of the Neva. Behind the two great Rostral Columns, decorated by carved ships’ prows, and across Pushkin Square, the point rises majestically to the former Exchange building (Thomas de Thomon, 1805–10), the city’s finest example of early 19th-century style and…

  • Strelna (Russia)

    Peterhof: …Peterhof and the village of Strelna, but this division was not formally recognized by the Russian government until 2009.

  • streltsy (Russian military unit)

    Streltsy, (Russian: “musketeer”), Russian military corps established in the middle of the 16th century that formed the bulk of the Russian army for about 100 years, provided the tsar’s bodyguard, and, at the end of the 17th century, exercised considerable political influence. Originally composed o

  • Strembytsky, Ihor (Ukrainian director)

    Ukraine: Theatre and motion pictures: …those directors are Taras Tomenko, Ihor Strembytsky, and Maryna Vroda. The Ukrainian motion picture industry is centred in Kyiv and Odessa.

  • strengite (mineral)

    Strengite, phosphate mineral similar to variscite (q.v.) with the chemical formula

  • strength (mechanics)

    materials testing: Radiation: Tensile and yield strength of a type of carbon-silicon steel increase with exposure to neutron radiation, although elongation, reduction in area, and probably fracture toughness apparently decrease with exposure. Certain wood/polymeric composite materials are even prepared by a process that employs radiation. The wood is first impregnated…

  • strength (physiology)

    human development: Increase in body size: …leads to an increase in strength. Before adolescence, boys and girls are similar in strength for a given body size and shape; after, boys have much greater strength, probably due to development of more force per gram of muscle as well as to absolutely larger muscles. They also develop larger…

  • Strength in Numbers (American musical group)

    Béla Fleck: …with the all-star acoustic group Strength in Numbers. By this time Fleck’s technical proficiency on the banjo and his adventurous musical experimentation had earned him an international following.

  • strength of materials (engineering discipline)

    Strength of materials, Engineering discipline concerned with the ability of a material to resist mechanical forces when in use. A material’s strength in a given application depends on many factors, including its resistance to deformation and cracking, and it often depends on the shape of the member

  • strength sets (sport)

    Powerlifting, an offshoot of Olympic weightlifting and weight training that emphasizes sheer strength more than technique, flexibility, and speed. Powerlifting (formerly called odd lifts or strength sets) was developed primarily in the United States and England by weightlifters who felt that

  • strep throat (pathology)

    scarlet fever: …to streptococcal pharyngitis, commonly called strep throat, and is frequently referred to as “strep throat with a rash.” The major difference between the two illnesses is that the scarlet fever bacterium gives rise to an antigen called the erythrogenic (“redness-producing”) toxin, which is responsible for the characteristic rash.

  • Strepera (bird)

    Currawong, any of several songbirds of the Australian family Cracticidae (order Passeriformes). They are large, up to 50 centimetres (20 inches) long, with black, gray, or black-and-white plumage and yellow eyes. All have resounding, metallic voices. Found in woodlands and occasionally flocking

  • Strepera graculina (bird)

    Chillawong, bird, a type of currawong

  • Strepponi, Giuseppina (Italian opera singer)

    Giuseppe Verdi: The early middle years: …who created Abigaille in Nabucco, Giuseppina Strepponi, who also had helped Verdi as early as 1839 with Oberto, ultimately became his second wife. Her love, support, and practical assistance on behalf of Verdi, over half a century, was boundless, though he was not an easy husband.

  • Strepsiptera (insect)

    Strepsipteran, (order Strepsiptera), any of about 600 species of small insects that are notable for their bizarre form of parasitism. Strepsipterans are parasitic in planthoppers, leafhoppers, treehoppers, froghoppers, bees, and other insects. Mature females are usually wingless and saclike,

  • strepsipteran (insect)

    Strepsipteran, (order Strepsiptera), any of about 600 species of small insects that are notable for their bizarre form of parasitism. Strepsipterans are parasitic in planthoppers, leafhoppers, treehoppers, froghoppers, bees, and other insects. Mature females are usually wingless and saclike,

  • Strepsirrhini (primate suborder)

    Lemur, (suborder Strepsirrhini), generally, any primitive primate except the tarsier; more specifically, any of the indigenous primates of Madagascar. In the broad sense, the term lemur applies not only to the typical lemurs (family Lemuridae) but also to the avahis, sifakas, indri, and aye-aye of

  • Streptaxacea (gastropod superfamily)

    gastropod: Classification: Superfamilies Streptaxacea and Rhytidacea Carnivorous snails and slugs (4 families) in most tropical areas, plus the herbivorous Acavidae of Australia, Sri Lanka, and Madagascar. Superfamily Bulimulacea Large, often arboreal snails of Melanesia and Neotropica (Bulimulidae); long, cylindrical snails of

  • Streptelasma (fossil genus of corals)

    Streptelasma, extinct genus of corals, existing as single animals rather than colonial forms and found as fossils in marine rocks of Ordovician to Devonian age (488 million to 359 million years old). Each horn-shaped specimen represents a single individual. The hard, and thus preserved, parts of

  • streptobacillary fever (pathology)

    Streptobacillary fever, acute infection caused by the microorganism Streptobacillus moniliformis, transmitted to humans by rat bite or by the ingestion of contaminated foods and characterized by the sudden onset of chills, fever, and vomiting followed by the development of a skin rash and

  • Streptobacillus moniliformis (bacterium)

    streptobacillary fever: …infection caused by the microorganism Streptobacillus moniliformis, transmitted to humans by rat bite or by the ingestion of contaminated foods and characterized by the sudden onset of chills, fever, and vomiting followed by the development of a skin rash and inflammation of the joints. An ulcerative lesion may be observed…

  • streptococcal pharyngitis (pathology)

    scarlet fever: …to streptococcal pharyngitis, commonly called strep throat, and is frequently referred to as “strep throat with a rash.” The major difference between the two illnesses is that the scarlet fever bacterium gives rise to an antigen called the erythrogenic (“redness-producing”) toxin, which is responsible for the characteristic rash.

  • streptococcal pneumonia

    pneumonia: Bacterial pneumonia: Streptococcal pneumonia, caused by Streptococcus pneumoniae, is the single most common form of pneumonia, especially in hospitalized patients. The bacteria may live in the bodies of healthy persons and cause disease only after resistance has been lowered by other illness or infection. Viral infections such…

  • Streptococcus (bacterium genus)

    Streptococcus, (genus Streptococcus), group of spheroidal bacteria belonging to the family Streptococcaceae. The term streptococcus (“twisted berry”) refers to the bacteria’s characteristic grouping in chains that resemble a string of beads. Streptococci are microbiologically characterized as

  • Streptococcus agalactiae (bacterium)

    Streptococcus: ” Streptococcus agalactiae, or group B streptococcus bacteria, can cause infections of the bladder and uterus in pregnant women; in newborn infants infection with the bacterium may result in sepsis (blood poisoning), meningitis (inflammation of the membranes covering the brain and spinal cord), or pneumonia. Streptococcus…

  • Streptococcus cremoris (bacterium)

    Streptococcus: lactis and S. cremoris are used in commercial starters for the production of butter, cultured buttermilk, and certain cheeses.

  • Streptococcus equi (bacterium)

    strangles: >Streptococcus equi, a bacterium that invades nasal and throat passages and forms abscesses in lymph nodes and other parts of the body. It is also called distemper of horses. Young horses are most susceptible to it, and outbreaks of the disease usually occur where a…

  • Streptococcus lactis (bacterium)

    Streptococcus: Among the lactic species, S. lactis and S. cremoris are used in commercial starters for the production of butter, cultured buttermilk, and certain cheeses.

  • Streptococcus mutans (bacterium)

    Streptococcus: S. mutans, belonging to the viridans species, inhabits the mouth and contributes to tooth decay. Among the lactic species, S. lactis and S. cremoris are used in commercial starters for the production of butter, cultured buttermilk, and certain cheeses.

  • Streptococcus pluton (bacterium)

    beekeeping: Diseases: …caused by a nonsporeforming bacterium, Streptococcus pluton, but Bacillus alvie and Acromobacter eurydice are often associated with Streptococcus pluton. This disease is similar in appearance to American foulbrood. In some instances it severely affects the colonies, but they recover so that colony destruction is not necessary. Terramycin can control the…

  • Streptococcus pneumoniae (bacterium)

    Pneumococcus, (Streptococcus pneumoniae), spheroidal bacterium in the family Streptococcaceae that causes human diseases such as pneumonia, sinusitis, otitis media, and meningitis. It is microbiologically characterized as a gram-positive coccus, 0.5 to 1.25 μm (micrometre; 1 μm = 10-6 metre) in

  • Streptococcus pyogenes (bacterium)

    Streptococcus: Streptococcus pyogenes, often referred to as group A streptococcus bacteria, can cause rheumatic fever, impetigo, scarlet fever, puerperal fever, streptococcal toxic shock syndrome, strep throat, tonsillitis, and other upper respiratory infections. Necrotizing

  • Streptococcus thermophilus (bacteria)

    bacteria: Bacteria in food: the mixture of Lactobacillus casei, Streptococcus thermophilus, and Propionibacterium shermanii is responsible for the ripening of Swiss cheese and the production of its characteristic taste and large gas bubbles. In addition, Brevibacterium linens is responsible for the flavour of Limburger cheese, and molds (Penicillium

  • Streptococcus viridans (bacterium)

    human disease: Infectious agents: Streptococcus viridans bacteria, for example, are found in the throats of more than 90 percent of healthy persons. In this area they are not considered pathogenic. The same organism cultured from the bloodstream, however, is highly pathogenic and usually indicates the presence of the disease…

  • streptokinase (drug)

    fibrinolytic drug: One fibrinolytic drug is streptokinase, which is produced from streptococcal bacteria. When administered systemically, streptokinase lyses acute deep-vein, pulmonary, and arterial thrombi; however, the drug is less effective in treating chronic occlusions (blockages). When administered intravenously soon after a coronary occlusion has formed, streptokinase is effective in reestablishing the…

  • Streptomyces (bacterium)

    Streptomyces, genus of filamentous bacteria of the family Streptomycetaceae (order Actinomycetales) that includes more than 500 species occurring in soil and water. Many species are important in the decomposition of organic matter in soil, contributing in part to the earthy odour of soil and

  • Streptomyces griseus (bacterium)

    streptomycin: … synthesized by the soil organism Streptomyces griseus. Streptomycin was discovered by American biochemists Selman Waksman, Albert Schatz, and Elizabeth Bugie in 1943. The drug acts by interfering with the ability of a microorganism to synthesize certain vital proteins. It was the first antimicrobial agent developed after penicillin and the first…

  • Streptomyces orchidaceus (bacterium)

    antibiotic: Antituberculosis antibiotics: Cycloserine, an antibiotic produced by Streptomyces orchidaceus, is also used in the treatment of tuberculosis. A structural analog of the amino acid d-alanine, it interferes with enzymes necessary for incorporation of d-alanine into the bacterial cell wall. It is rapidly absorbed from the gastrointestinal tract and penetrates most tissues quite…

  • Streptomyces scabies (bacterium)
  • Streptomyces venezuelae (bacterium)

    chloramphenicol: metabolism of the soil bacterium Streptomyces venezuelae (order Actinomycetales) and subsequently was synthesized chemically. It achieves its antibacterial effect by interfering with protein synthesis in these microorganisms. It is seldom used today, however, because of its potential toxicity and the availability of safer drugs.

  • streptomycin (drug)

    Streptomycin, antibiotic synthesized by the soil organism Streptomyces griseus. Streptomycin was discovered by American biochemists Selman Waksman, Albert Schatz, and Elizabeth Bugie in 1943. The drug acts by interfering with the ability of a microorganism to synthesize certain vital proteins. It

  • Streptopelia capicola (bird)

    turtledove: decaocto) and ring-necked doves (S. capicola). These slim-bodied, fast-flying gamebirds are found throughout the temperate and tropical Old World. The ringed turtledove, or ringdove, is a domestic variant of S. turtur that now has feral New World populations in California and Florida; it is sometimes given species…

  • Streptopelia chinensis (bird)

    turtledove: senegalensis) and spotted dove (S. chinensis) have also been introduced outside their native habitats. The use of the term turtle in this pigeon’s common name is derived from the sound of its call; the bird has no association with shelled reptiles.

  • Streptopelia decaocto (bird)

    turtledove: …the other Streptopelia species, including collared doves (S. decaocto) and ring-necked doves (S. capicola). These slim-bodied, fast-flying gamebirds are found throughout the temperate and tropical Old World. The ringed turtledove, or ringdove, is a domestic variant of S. turtur that now has feral New World populations in California and Florida;…

  • Streptopelia risoria (bird)

    Wood pigeon, (species Columba palumbus), bird of the subfamily Columbinae (in the pigeon family, Columbidae), found from the forested areas of Europe, North Africa, and western Asia east to the mountains of Sikkim state in India. It is about 40 cm (16 inches) long, grayish with a white collar and

  • Streptopelia senegalensis (bird)

    Laughing dove, (Streptopelia senegalensis), bird of the pigeon family, Columbidae (order Columbiformes), a native of African and southwest Asian scrublands that has been successfully introduced into Australia. The reddish-brown bird has blue markings on its wings, a white edge on its long tail,

  • Streptopelia turtur (bird)

    Turtledove, (Streptopelia turtur), European and North African bird of the pigeon family, Columbidae (order Columbiformes), that is the namesake of its genus. The turtledove is 28 cm (11 inches) long. Its body is reddish brown, the head is blue-gray, and the tail is marked with a white tip. It is a

  • Streptoprocne zonaris (bird)

    swift: The white-collared swift (Streptoprocne zonaris), soft-tailed and brownish black with a narrow white collar, is found from Mexico to Argentina and on larger Caribbean islands, nesting in caves and behind waterfalls. The white-rumped swift (Apus caffer), soft-tailed and black with white markings, is resident throughout Africa…

  • Stresa (Italy)

    Stresa, town, Piemonte (Piedmont) regione, northwestern Italy, on the western shore of Lake Maggiore. A health and tourist resort noted for its pleasant climate and scenic surroundings, it is a favourite site for congresses. A conference held there in 1935 between Italy, Great Britain, and France

  • Stresa Front (European alliance)

    Stresa Front, coalition of France, Britain, and Italy formed in April 1935 at Stresa, Italy, to oppose Adolf Hitler’s announced intention to rearm Germany, which violated terms of the Treaty of Versailles. When Italy invaded Ethiopia later that year, France and Britain tried to reconcile the action

  • Stresemann, Gustav (chancellor of Germany)

    Gustav Stresemann, chancellor (1923) and foreign minister (1923, 1924–29) of the Weimar Republic, largely responsible for restoring Germany’s international status after World War I. With French foreign minister Aristide Briand, he was awarded the Nobel Prize for Peace in 1926 for his policy of

  • stress (linguistics)

    Stress, in phonetics, intensity given to a syllable of speech by special effort in utterance, resulting in relative loudness. This emphasis in pronunciation may be merely phonetic (i.e., noticeable to the listener, but not meaningful), as it is in French, where it occurs regularly at the end of a

  • stress (music)

    Accent, in music, momentary emphasis on a particular rhythmic or melodic detail; accent may be implied or specifically indicated, either graphically for example, >, —) or verbally (sforzato, abbreviated sfz). In metrically organized music, accents serve to articulate rhythmic groupings, e

  • stress (physics)

    Stress, in physical sciences and engineering, force per unit area within materials that arises from externally applied forces, uneven heating, or permanent deformation and that permits an accurate description and prediction of elastic, plastic, and fluid behaviour. A stress is expressed as a

  • stress (psychology and biology)

    Stress, in psychology and biology, any environmental or physical pressure that elicits a response from an organism. In most cases, stress promotes survival because it forces organisms to adapt to rapidly changing environmental conditions. For example, in response to unusually hot or dry weather,

  • stress analysis

    materials testing: Mechanical testing: A stress analysis, accomplished either experimentally or by means of a mathematical model, indicates expected areas of high stress in a machine or structure. Mechanical property tests, carried out experimentally, indicate which materials may safely be employed.

  • stress component (mechanics)

    mechanics of solids: The general theory of elasticity: …elastic constants relating the 6 stress components to the 6 strains, at most 21 could be independent. The Scottish physicist Lord Kelvin put this consideration on sounder ground in 1855 as part of his development of macroscopic thermodynamics, showing that a strain energy function must exist for reversible isothermal or…

  • stress fracture (medicine)

    Stress fracture, any overuse injury that affects the integrity of bone. Stress fractures were once commonly described as march fractures, because they were reported most often in military recruits who had recently increased their level of impact activities. The injuries have since been found to be

  • stress incontinence (physiology)

    pregnancy: Urinary tract: …laughs; this is known as stress incontinence.

  • stress tensor (mechanics)

    mechanics of solids: Equations of motion: Thus, the stress tensor is symmetric.

  • Stress Test (work by Geithner)
  • stress test (medicine)

    cardiac magnetic resonance imaging: …MRI is sometimes employed for stress testing, in which heart rate or blood flow to the heart is increased artificially through drug administration in order to detect obstructions in the coronary arteries or other heart vessels. In persons with coronary heart disease, cardiac MRI may be used to predict heart…

  • stress vector (physics)

    mechanics of solids: Stress: …could be represented as a stress vector T, defined so that TdS is an element of force acting over the area dS of the surface (Figure 1). Hence, the principles of linear and angular momentum take the forms

  • stress-analysis holography (science)

    strain gauge: …an object are photoelasticity and stress-analysis holography. Photoelasticity provides a visual method of observing the strain on an object by viewing the effects of polarized light on a bi-refringent (double-refracting) material bonded to the object. As the test object is stressed, fringe patterns in the bi-refringent material represent the regions…

  • stress-relaxation test (mechanics)

    deformation and flow: …procedure is known as a stress-relaxation test. The physical reasons for this behaviour are too complex to be explained by any simple molecular model. Such behaviour is characteristic of glass, rubber, many plastics, and some metals.

  • stress-rupture curve

    materials testing: Creep test: …the resulting curve is called stress rupture or creep rupture. Once creep strain versus time is plotted, a variety of mathematical techniques is available for extrapolating creep behaviour of materials beyond the test times so that designers can utilize thousand-hour test data, for example, to predict ten-thousand-hour behaviour.

  • stressed-skin construction (technology)

    aerospace industry: Between the wars: …of the most fruitful was stressed-skin construction, in which the plane’s skin carried loads in conjunction with the support framework. This approach eliminated many internal trusses and braces within the wing and fuselage, contributed to a lighter and more efficient airframe design, and changed construction techniques. European manufacturers were responsible…

  • Stretch (supercomputer)

    Fred Brooks: …where he worked on the IBM 7030 (known as Stretch), a supercomputer ordered by the U.S. National Security Agency for the Los Alamos National Laboratory. Together with Dura Sweeney, Brooks invented the computer’s interrupt system, which is used to recognize different computing “events” that require immediate attention and to synchronize…

  • stretch (baseball)

    baseball: Pitching with men on base: …home plate, to the “stretch,” a stance that begins with a left-handed pitcher facing first base or a right-handed pitcher facing third base. Pitching from the stretch allows for a shorter motion that gets the ball to the catcher more quickly and allows the base runner less time to…

  • stretch blow molding (materials technology)

    plastic: Blow molding: …in diameter and length (stretch blow molding), the polymer is biaxially oriented, resulting in enhanced strength and, in the case of polyethylene terephthalate (PET) particularly, enhanced crystallinity.

  • stretch forming (materials science)

    materials science: Polymer-matrix composites: Stretch forming, a variation on thermoplastic sheet forming, is specifically designed to take advantage of the extensibility, or ability to be stretched, of thermoplastics reinforced with long, discontinuous fibres. In this process, a straight preconsolidated beam is heated and then stretched over a shaped tool…

  • stretch mark (anatomy)

    pregnancy: Skin: “Stretch marks,” which appear on the breasts and abdomen during pregnancy, are due to the tearing of the elastic tissues in the skin that accompanies enlargement of the breasts, distention of the abdomen, and the deposition of subcutaneous fat. They are pink or purplish red…

  • stretch ratio (mechanics)

    mechanics of solids: Strain and strain-displacement relations: …λ = Δx3/ΔX3 are called stretch ratios. There are various ways that extensional strain can be defined in terms of them. Note that the change in displacement in, say, the x1 direction between points at one end of the block and those at the other is Δu1 = (λ1 ?…

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