Category: Anxiety

In continuum mechanics, stress is a physical quantity that expresses the internal forces that neighboring particles of a continuous material exert on each other, while strain is the measure of the deformation of the material. For example, when a solid vertical bar is supporting a weight, each particle in the bar pushes on the particles immediately below it. When a liquid is in a closed container under pressure, each particle gets pushed against by all the surrounding particles. The container walls and the pressure-inducing surface (such as a piston) push against them in (Newtonian) reaction. These macroscopic forces are actually the net result of a very large number of intermolecular forces and collisions between the particles in those molecules. Stress is frequently represented by a lowercase Greek letter sigma (σ). Strain inside a material may arise by various mechanisms, such as stress as applied by external forces to the bulk material (like gravity) or to its surface (like contact forces, external pressure, or friction). Any strain (deformation) of a solid material generates an internal elastic stress, analogous to the reaction force of a spring, that tends to restore the material to its original non-deformed state. In liquids and gases, only deformations that change the volume generate persistent elastic stress. However, if the deformation is gradually changing with time, even in fluids there will usually be some viscous stress, opposing that change. Elastic and viscous stresses are usually combined under the name mechanical stress. Significant stress may exist even when deformation is negligible or non-existent (a common assumption when modeling the flow of water). Stress may exist in the absence of external forces; such built-in stress is important, for example, in prestressed concrete and tempered glass. Stress may also be imposed on a material without the application of net forces, for example by changes in temperature or chemical composition, or by external electromagnetic fields (as in piezoelectric and magnetostrictive materials). The relation between mechanical stress, deformation, and the rate of change of deformation can be quite complicated, although a linear approximation may be adequate in practice if the quantities are small enough. Stress that exceeds certain strength limits of the material will result in permanent deformation (such as plastic flow, fracture, cavitation) or even change its crystal structure and chemical composition. In some branches of engineering, the term stress is occasionally used in a looser sense as a synonym of “internal force”. For example, in the analysis of trusses, it may refer to the total traction or compression force acting on a beam, rather than the force divided by the area of its cross-section.

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A job scheduler is a computer application for controlling unattended background program execution of jobs. This is commonly called batch scheduling, as execution of non-interactive jobs is often called batch processing, though traditional job and batch are distinguished and contrasted; see that page for details. Other synonyms include batch system, distributed resource management system (DRMS), distributed resource manager (DRM), and, commonly today, workload automation. The data structure of jobs to run is known as the job queue. Modern job schedulers, often termed workload automation, typically provide a graphical user interface and a single point of control for definition and monitoring of background executions in a distributed network of computers. Increasingly, job schedulers are required to orchestrate the integration of real-time business activities with traditional background IT processing across different operating system platforms and business application environments. Job scheduling should not be confused with process scheduling, which is the assignment of currently running processes to CPUs by the operating system.

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In linguistics, and particularly phonology, stress or accent is relative emphasis or prominence given to a certain syllable in a word, or to a certain word in a phrase or sentence. This emphasis is typically caused by such properties as increased loudness and vowel length, full articulation of the vowel, and changes in pitch. The terms stress and accent are often used synonymously in this context, but they are sometimes distinguished. For example, when emphasis is produced through pitch alone, it is called pitch accent, and when produced through length alone, it is called quantitative accent. When caused by a combination of various intensified properties, it is called stress accent or dynamic accent; English uses what is called variable stress accent. Since stress can be realised through a wide range of phonetic properties, such as loudness, vowel length, and pitch, which are also used for other linguistic functions, it is difficult to define stress solely phonetically. The stress placed on syllables within words is called word stress or lexical stress. Some languages have fixed stress, meaning that the stress on virtually any multisyllable word falls on a particular syllable, such as the penultimate (e.e. Polish) or the first. Other languages, like English and Russian, have variable stress, where the position of stress in a word is not predictable in that way. Sometimes more than one level of stress, such as primary stress and secondary stress, may be identified. However, some languages, such as French and Mandarin, are sometimes analyzed as lacking lexical stress entirely. The stress placed on words within sentences is called sentence stress or prosodic stress. This is one of the three components of prosody, along with rhythm and intonation. It includes phrasal stress (the default emphasis of certain words within phrases or clauses), and contrastive stress (used to highlight an item − a word, or occasionally just part of a word − that is given particular focus).

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The Slurm Workload Administrator (previously known as easy Linux Energy for Reference Management or SLURM), or Slurm, is a free of charge and open-source job scheduler for Linux and Unix-like kernels, employed by lots of the world’s supercomputers and computer clusters. It offers three key functions. First, it allocates exclusive and/or non-exclusive usage of resources (computer nodes) to users for a few passage of time to allow them to perform work. Second, it offers a platform for starting, performing, and monitoring work (typically a parallel job such as MPI) on a couple of allocated nodes. Finally, it arbitrates contention for resources by owning a queue of pending careers. Slurm is the workload administrator on about 60% of the TOP500 supercomputers, including Tianhe-2 that, until 2016, was the world’s speediest computer.Slurm runs on the best fit algorithm predicated on Hilbert curve arranging or extra fat tree network topology to be able to optimize area of task projects on parallel computer systems.

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A stress ulcer is a single or multiple mucosal defect which can become complicated by upper gastrointestinal bleeding physiologic stress . Ordinary peptic ulcers are found commonly in the gastric antrum and the duodenum whereas stress ulcers are found commonly in fundic mucosa and can be located anywhere within the stomach and proximal duodenum.

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Joseph Stalin (born Ioseb Besarionis dze Jughashvili; 18 December 1878 – 5 March 1953) was a Soviet revolutionary and politician of Georgian ethnicity. Ruling the Soviet Union from the mid-1920s until his death in 1953, he served as General Secretary of the Communist Party of the Soviet Union from 1922 to 1952 and as the nation’s Premier from 1941 to 1953. Initially presiding over an oligarchic one-party state that governed by consensus, he became the de facto dictator of the Soviet Union by the 1930s. Ideologically committed to the Leninist interpretation of Marxism, Stalin helped to formalise these ideas as Marxism–Leninism while his own policies became known as Stalinism. Born to a poor family in Gori, Russian Empire, Stalin began his revolutionary career in his youth by joining the Marxist Russian Social Democratic Labour Party. There, he edited the party’s newspaper, Pravda, and raised funds for Vladimir Lenin’s Bolshevik faction via robberies, kidnappings, and protection rackets. Repeatedly arrested, he underwent several internal exiles. After the Bolsheviks seized power in Russia during the 1917 October Revolution, Stalin joined the party’s governing Politburo where he was instrumental in overseeing the Soviet Union’s establishment in 1922. Despite Lenin’s opposition, he assumed leadership over the country shortly after the former’s death in 1924. During Stalin’s rule, “Socialism in One Country” became a central tenet of the party’s dogma, and Lenin’s New Economic Policy was replaced with a centralized command economy. Under the Five-Year Plan system, the country underwent collectivisation and rapid industrialization but also experienced significant disruptions in food production that contributed to the famine of 1932–33. To eradicate those regarded as “enemies of the working class”, Stalin instituted the “Great Purge” in which over a million were imprisoned and at least 700,000 were executed from 1934 to 1939. Stalin’s government promoted Marxism–Leninism abroad through the Communist International and supported anti-fascist movements throughout Europe during the 1930s, particularly in the Spanish Civil War. In 1939 it signed a non-aggression pact with Nazi Germany, resulting in their joint invasion of Poland. Germany ended the pact by invading the Soviet Union in 1941. Despite initial setbacks, the Soviet Red Army halted the German incursion and captured Berlin in 1945, ending World War II in Europe. The Soviets annexed the Baltic states and helped establish Soviet-aligned governments throughout most of Central and Eastern Europe and in China and North Korea. The Soviet Union and the United States emerged from the war as the two world superpowers. Tensions escalated into a Cold War between the Soviet-backed Eastern Bloc and U.S.-backed Western Bloc. Stalin led his country through its post-war reconstruction, during which it developed a nuclear weapon in 1949. In these years, the country experienced another major famine and a period of antisemitism peaking in the 1952–53 Doctors’ plot. Stalin died in 1953 and was eventually succeeded by Nikita Khrushchev, who denounced his predecessor and initiated a de-Stalinisation process throughout Soviet society. Widely considered one of the 20th century’s most significant figures, Stalin was the subject of a pervasive personality cult within the international Marxist–Leninist movement, for whom Stalin was a champion of socialism and the working class. Since the 1991 dissolution of the Soviet Union, Stalin has retained popularity in Russia and Georgia as a victorious wartime leader who established the Soviet Union as a major world power. Conversely, his totalitarian government has been widely condemned for overseeing mass repressions, ethnic cleansing, hundreds of thousands of executions, and famines which caused the deaths of millions.

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Hypoventilation (also known as respiratory depression) occurs when ventilation is inadequate (hypo meaning “below”) to perform needed gas exchange. By definition it causes an increased concentration of carbon dioxide (hypercapnia) and respiratory acidosis. Hypoventilation is not synonymous with respiratory arrest, in which breathing ceases entirely and death occurs within minutes due to hypoxia and leads rapidly into complete anoxia, although both are medical emergencies. Hypoventilation can be considered a precursor to hypoxia and its lethality is attributed to hypoxia with carbon dioxide toxicity.

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A stress position, also known as a submission position, places the human body in such a way that a great amount of weight is placed on just one or two muscles. For example, a subject may be forced to stand on the balls of his feet, then squat so that his thighs are parallel to the ground. This creates an intense amount of pressure on the legs, leading first to pain and then muscle failure. Forcing prisoners to adopt such positions is an enhanced interrogation technique used for extracting information.

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