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LST Sicily
LST may refer to: Education * Licentiate of Sacred Theology * Liston College * London School of Theology Organizations * Law School Transparency * Linux Support Team, a defunct German Linux distributor (LST Linux, Power Linux) since 1993 * LST Software GmbH (from Linux System Technology), a German software company, successor of Linux Support Team and predecessor of Caldera Deutschland GmbH Places * Launceston Airport * Liverpool Street station, a major railway and tube station in London (station code LST) Science and technology * Land Surveyor in Training * Landing Ship, Tank, a type of United States Navy amphibious warfare ship * Laplace-Stieltjes transform, a transform similar to the Laplace transform * Large Space Telescope, the Hubble Space Telescope * Living Systems Theory * Log-space transducer, a type of Turing machine used for log-space reductions * Löwenheim–Skolem theorem, a theorem in first-order logic dealing with the cardinality of models * Lowsta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hubble Space Telescope
The Hubble Space Telescope (often referred to as HST or Hubble) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. It was not the first space telescope, but it is one of the largest and most versatile, renowned both as a vital research tool and as a public relations boon for astronomy. The Hubble telescope is named after astronomer Edwin Hubble and is one of NASA's Great Observatories. The Space Telescope Science Institute (STScI) selects Hubble's targets and processes the resulting data, while the Goddard Space Flight Center (GSFC) controls the spacecraft. Hubble features a mirror, and its five main instruments observe in the ultraviolet, visible, and near-infrared regions of the electromagnetic spectrum. Hubble's orbit outside the distortion of Earth's atmosphere allows it to capture extremely high-resolution images with substantially lower background light than ground-based telescopes. It has recorded some of the most detaile ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Standard Time
Standard time is the synchronisation of clocks within a geographical region to a single time standard, rather than a local mean time standard. Generally, standard time agrees with the local mean time at some meridian that passes through the region, often near the centre of the region. Historically, standard time was established during the 19th century to aid weather forecasting and train travel. Applied globally in the 20th century, the geographical regions became time zones. The standard time in each time zone has come to be defined as an UTC offset, offset from Universal Time. A further offset is applied for part of the year in regions with daylight saving time. The adoption of standard time, because of the inseparable correspondence between time and longitude, solidified the concept of halving the globe into an eastern hemisphere, eastern and western hemisphere, with one prime meridian replacing the prime meridian#History, various prime meridians that had previously been us ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sidereal Time
Sidereal time (as a unit also sidereal day or sidereal rotation period) (sidereal ) is a timekeeping system that astronomers use to locate celestial objects. Using sidereal time, it is possible to easily point a telescope to the proper coordinates in the night sky. In short, sidereal time is a "time scale that is based on Earth's rate of rotation measured relative to the fixed stars", or more correctly, relative to the March equinox. Viewed from the same location, a star seen at one position in the sky will be seen at the same position on another night at the same sidereal time. This is similar to how the time kept by a sundial (Solar time) can be used to find the location of the Sun. Just as the Sun and Moon appear to rise in the east and set in the west due to the rotation of Earth, so do the stars. Both Solar time and sidereal time make use of the regularity of Earth's rotation about its polar axis: solar time following the Sun while, roughly speaking, sidereal time follo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Least Slack Time Scheduling
Least slack time (LST) scheduling is an algorithm for dynamic priority scheduling. It assigns priorities to processes based on their ''slack time''. Slack time is the amount of time left after a job if the job was started now. This algorithm is also known as least laxity first. Its most common use is in embedded systems, especially those with multiple processors. It imposes the simple constraint that each process on each available processor possesses the same run time, and that individual processes do not have an affinity to a certain processor. This is what lends it a suitability to embedded systems. Slack time This scheduling algorithm first selects those processes that have the smallest "slack time". Slack time is defined as the temporal difference between the deadline, the ready time and the run time. More formally, the ''slack time'' s for a process is defined as: s = (d - t) -c' where d is the process deadline, t is the real time since the cycle start, and c' is the remain ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lyddane–Sachs–Teller Relation
In condensed matter physics, the Lyddane–Sachs–Teller relation (or LST relation) determines the ratio of the natural frequency of longitudinal optic lattice vibrations (phonons) (\omega_\text) of an ionic crystal to the natural frequency of the transverse optical lattice vibration (\omega_\text) for long wavelengths (zero wavevector). The ratio is that of the static permittivity \varepsilon_ to the permittivity for frequencies in the visible range \varepsilon_. The Lyddane–Sachs–Teller relation is named after the physicists R. H. Lyddane, Robert G. Sachs, and Edward Teller. Origin and limitations The Lyddane–Sachs–Teller relation applies to optical lattice vibrations that have an associated net polarization density, so that they can produce long ranged electromagnetic fields (over ranges much longer than the inter-atom distances). The relation assumes an idealized polar ("infrared active") optical lattice vibration that gives a contribution to the frequency-depende ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sequence Stratigraphy
Sequence stratigraphy is a branch of geology, specifically a branch of stratigraphy, that attempts to discern and understand historic geology through time by subdividing and linking sedimentary deposits into unconformity bounded units on a variety of scales. The essence of the method is mapping of strata based on identification of surfaces which are assumed to represent time lines (e.g. subaerial unconformities, maximum flooding surfaces), thereby placing stratigraphy in chronostratigraphic framework allowing understanding of the evolution of the earth's surface in a particular region through time. Sequence stratigraphy is a useful alternative to a purely lithostratigraphic approach, which emphasizes solely based on the compositional similarity of the lithology of rock units rather than time significance. Unconformities are particularly important in understanding geologic history because they represent erosional surfaces where there is a clear gap in the record. Conversely w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Löwenheim–Skolem Theorem
In mathematical logic, the Löwenheim–Skolem theorem is a theorem on the existence and cardinality of models, named after Leopold Löwenheim and Thoralf Skolem. The precise formulation is given below. It implies that if a countable first-order theory has an infinite model, then for every infinite cardinal number ''κ'' it has a model of size ''κ'', and that no first-order theory with an infinite model can have a unique model up to isomorphism. As a consequence, first-order theories are unable to control the cardinality of their infinite models. The (downward) Löwenheim–Skolem theorem is one of the two key properties, along with the compactness theorem, that are used in Lindström's theorem to characterize first-order logic. In general, the Löwenheim–Skolem theorem does not hold in stronger logics such as second-order logic. Theorem In its general form, the Löwenheim–Skolem Theorem states that for every signature ''σ'', every infinite ''σ''-structure ''M'' and e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Log-space Transducer
In computational complexity theory, a log space transducer (LST) is a type of Turing machine used for log-space reductions. A log space transducer, M, has three tapes: * A read-only ''input'' tape. * A read/write ''work'' tape (bounded to at most O(\log n) symbols). * A write-only, write-once ''output'' tape. M will be designed to compute a log-space computable function f\colon \Sigma^\ast \rightarrow \Sigma^\ast (where \Sigma is the alphabet of both the ''input'' and ''output'' tapes). If M is executed with w on its ''input'' tape, when the machine halts, it will have f(w) remaining on its ''output'' tape. A language A \subseteq \Sigma^\ast is said to be log-space reducible to a language B \subseteq \Sigma^\ast if there exists a log-space computable function f that will convert an input from problem A into an input to problem B in such a way that w \in A \iff f(w) \in B. This seems like a rather convoluted idea, but it has two useful properties that are desirable for a reducti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Living Systems Theory
Living systems are open self-organizing life forms that interact with their environment. These systems are maintained by flows of information, energy and matter. In the last few decades, some scientists have proposed that a general living systems theory is required to explain the nature of life. Such a general theory, arising out of the ecological and biological sciences, attempts to map general principles for how all living systems work. Instead of examining phenomena by attempting to break things down into components, a general living systems theory explores phenomena in terms of dynamic patterns of relationships of organisms with their environment. Theory The living systems theory is a general theory about the existence of all living systems, their structure, interaction, behavior and development. This work is created by James Grier Miller, which was intended to formalize the concept of life. According to Miller's original conception as spelled out in his magnum opus ''Living S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Licentiate Of Sacred Theology
Licentiate in Sacred Theology ( la, Sacrae Theologiae Licentiatus; abbreviated STL) is the second of three ecclesiastical degrees in theology (the first being the Baccalaureate in Sacred Theology and the third being the Doctorate in Sacred Theology) which are conferred by a number of pontifical faculties around the world. The licentiate comes with attendant canonical effects in the Catholic Church, specifically granting the holder the right to teach in Catholic seminaries and schools of theology. Description The program for a licentiate's degree is equivalent to a total of two years or four semesters of full-time study after receiving a university degree and the Bachelor of Sacred Theology degree TB(SapC 72b). The STB, or first cycle, requires five years or ten semesters (SapC 72a). "In this cycle the special disciplines are taught corresponding to the nature of the diverse specializations being undertaken. Also seminars and practical exercises are conducted for the acquisiti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
