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Coalescing Random Walk
Coalescence may refer to: * Coalescence (chemistry), the process by which two or more separate masses of miscible substances seem to "pull" each other together should they make the slightest contact * Coalescence (computer science), the merging of adjacent blocks of memory to fill gaps caused by deallocated memory * Coalescence (genetics), the merging of genetic lineages backwards to a most recent common ancestor * Coalescence (linguistics), the merging of two or more phonological segments into one * Coalescence (physics) Coalescence is the process by which two or more droplets, bubbles or particles merge during contact to form a single daughter droplet, bubble or particle. It can take place in many processes, ranging from meteorology to astrophysics. For example ..., the merging of two or more droplets, bubbles or particles into one * COALESCE, a SQL command that selects the first non-null from a range of values * In geography, the process by which urban sprawl produces a lin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coalescence (chemistry)
In chemistry, coalescence is a process in which two phase domains of the same composition come together and form a larger phase domain. In other words, the process by which two or more separate masses of miscible Miscibility () is the property of two substances to mix in all proportions (that is, to fully dissolve in each other at any concentration), forming a homogeneous mixture (a solution). The term is most often applied to liquids but also applies ... substances seem to "pull" each other together should they make the slightest contact. References External links IUPAC Gold Book Physical chemistry {{physical-chemistry-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coalescence (computer Science)
In computer science, coalescing is a part of memory management in which two adjacent free blocks of computer memory are merged. When a Computer program, program no longer requires certain blocks of memory, these blocks of memory can be Free a memory location, freed. Without coalescing, these blocks of memory stay separate from each other in their original requested size, even if they are next to each other. If a subsequent request for memory specifies a size of memory that cannot be met with an integer number of these (potentially unequally-sized) freed blocks, these neighboring blocks of freed memory cannot be allocated for this request. Coalescing alleviates this issue by setting the neighboring blocks of freed memory to be contiguous without boundaries, such that part or all of it can be allocated for the request. Among other techniques, coalescing is used to reduce Fragmentation (computer), external fragmentation, but is not totally effective. Coalescing can be done as soon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coalescence (genetics)
Coalescent theory is a model of how alleles sampled from a population may have originated from a common ancestor. In the simplest case, coalescent theory assumes no recombination, no natural selection, and no gene flow or population structure, meaning that each variant is equally likely to have been passed from one generation to the next. The model looks backward in time, merging alleles into a single ancestral copy according to a random process in coalescence events. Under this model, the expected time between successive coalescence events increases almost exponentially back in time (with wide variance). Variance in the model comes from both the random passing of alleles from one generation to the next, and the random occurrence of mutations in these alleles. The mathematical theory of the coalescent was developed independently by several groups in the early 1980s as a natural extension of classical population genetics theory and models, but can be primarily attributed to John K ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coalescence (linguistics)
In phonetics and historical linguistics, fusion, or coalescence, is a sound change where two or more segments with distinctive features merge into a single segment. This can occur both on consonants and in vowels. A word like ''educate'' is one that may exhibit fusion, e.g. or . A merger between two segments can also occur between word boundaries, an example being the phrase ''got ya'' being pronounced like ''gotcha'' . Most cases of fusion lead to allophonic variation, though some sequences of segments may lead to wholly distinct phonemes. A common form of fusion is found in the development of nasal vowels, which frequently become phonemic when final nasal consonants are lost from a language. This occurred in French and Portuguese. Compare the French words ''un vin blanc'' "a white wine" with their English cognates, ''one, wine, blank,'' which retain the n's. Often the resulting sound has the place of articulation of one of the source sounds and the manner of articulatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coalescence (physics)
Coalescence is the process by which two or more droplets, bubbles or particles merge during contact to form a single daughter droplet, bubble or particle. It can take place in many processes, ranging from meteorology to astrophysics. For example, it is seen in the formation of raindrops as well as planetary and star formation. In meteorology, its role is crucial in the formation of rain. As droplets are carried by the updrafts and downdrafts in a cloud, they collide and coalesce to form larger droplets. When the droplets become too large to be sustained on the air currents, they begin to fall as rain. Adding to this process, the cloud may be seeded with ice from higher altitudes, either via the cloud tops reaching , or via the cloud being seeded by ice from cirrus clouds. Contrast-enhanced ultrasound in medicine applies microscopic bubbles for imaging and therapy. Coalescence of ultrasound contrast agent microbubbles is studied to prevent embolies or to block tumour vessels ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Conurbation
A conurbation is a region comprising a number of metropolises, cities, large towns, and other urban areas which through population growth and physical expansion, have merged to form one continuous urban or industrially developed area. In most cases, a conurbation is a polycentric urbanised area in which transportation has developed to link areas. They create a single urban labour market or travel to work area. Patrick Geddes coined the term in his book ''Cities In Evolution'' (1915). He drew attention to the ability of the new technology at the time of electric power and motorised transport to allow cities to spread and agglomerate together, and gave as examples " Midlandton" in England, the Ruhr in Germany, Randstad in the Netherlands, and the Northeastern Seaboard in the United States. The term as described is used in Britain whereas in the United States, each polycentric "metropolitan area" may have its own common designation such as San Francisco Bay Area or the Dallas†... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coalescence (Whit Dickey Album)
''Coalescence'' is an album by American jazz drummer Whit Dickey recorded in 2003 and released on the Portuguese Clean Feed Records, Clean Feed label. Dickey leads a quartet built around a traditional lineup with Roy Campbell, Jr., Roy Campbell on trumpet, Rob Brown (saxophonist), Rob Brown on alto sax and flute and Joe Morris (guitarist), Joe Morris on acoustic bass in place of guitar.''Coalescence'' at Clean Feed Reception In his review for AllMusic, Thom Jurek notes "Dickey's own timekeeping is also full of dynamic control and keeps the entire process of unfolding within the linguistic sensibilities of hard-swinging jazz." The All About Jazz review by Clifford Allen states "Dickey is not, with this ensemble, presenting a dramatic new concept in improvised music, as his ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
