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Displacement Free Aerophones
Displacement may refer to: Physical sciences Mathematics and Physics *Displacement (geometry), is the difference between the final and initial position of a point trajectory (for instance, the center of mass of a moving object). The actual path covered to reach the final position is irrelevant. **Particle displacement, a measurement of distance of the movement of a particle in a medium as it transmits a wave (represented in mathematics by the lower-case Greek letter ξ) **Displacement field (mechanics), an assignment of displacement vectors for all points in a body that is displaced from one state to another **Electric displacement field, as appears in Maxwell's equations *Wien's displacement law, a relation concerning the spectral distribution of blackbody radiation *Angular displacement, a change in orientation of a rigid body, the amount of rotation about a fixed axis. Engineering *Engine displacement, the total volume of air/fuel mixture an engine can draw in during one compl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Displacement (geometry)
In geometry and mechanics, a displacement is a vector whose length is the shortest distance from the initial to the final position of a point P undergoing motion. It quantifies both the distance and direction of the net or total motion along a straight line from the initial position to the final position of the point trajectory. A displacement may be identified with the translation that maps the initial position to the final position. A displacement may be also described as a ''relative position'' (resulting from the motion), that is, as the final position of a point relative to its initial position . The corresponding displacement vector can be defined as the difference between the final and initial positions: s = x_\textrm - x_\textrm = \Delta In considering motions of objects over time, the instantaneous velocity of the object is the rate of change of the displacement as a function of time. The instantaneous speed, then, is distinct from velocity, or the time rate of cha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Double Displacement Reaction
A salt metathesis reaction, sometimes called a double displacement reaction, is a chemical process involving the exchange of bonds between two reacting chemical species which results in the creation of products with similar or identical bonding affiliations. This reaction is represented by the general scheme: :AB + CD -> AD + CB The bond between the reacting species can be either ionic or covalent. Classically, these reactions result in the precipitation of one product. In older literature, the term double decomposition is frequently encountered. The term double decomposition is more specifically used when at least one of the substances does not dissolve in the solvent, as the ligand or ion exchange takes place in the solid state of the reactant. For example: :AX(aq) + BY(s) → AY(aq) + BX(s). Types of reactions Counterion exchange Salt metathesis is a common technique for exchanging counterions. The choice of reactants is guided by a solubility chart or lattice ener ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Child Displacement
Child displacement is the complete removal or separation of children from their parents and immediate family or settings in which they have initially been reared. Displaced children includes varying categories of children who experience separation from their families and social settings due to several varied reasons. These populations include children separated from their parents, refugees,Alfredson, Lisa, (2002) 'Child Soldiers, Displacement and Human Security', 4 Disarmament Forum pp. l 7-27 children sent to boarding schools,CWAB - Session 6.2 - Reasons for displacement European Union – Canada project Child welfare across borders (2003) internally displaced persons or IDPs, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Displacement (fencing) .
Fencing
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In fencing, a displacement is a movement that avoids or dodges an attack. Fencers commonly use displacement when attacking while not having priority. Attacking into the opponent's right-of-way is known as a ''counter-attack''. If both fencers land, the fencer with priority, the attacker, is awarded the touch; therefore, the goal of the displacement is to hit the opponent while avoiding being hit in return. Displacement can take the form of retreating, advancing past the enemy's blade, utilising a flèche, ducking, or even stepping off the piste A ''piste'' () is a marked ski run or path down a mountain for snow skiing, snowboarding, or other mountain sports. This European term is French [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gentrification
Gentrification is the process of changing the character of a neighborhood through the influx of more affluent residents and businesses. It is a common and controversial topic in urban politics and planning. Gentrification often increases the economic value of a neighborhood, but the resulting demographic displacement may itself become a major social issue. Gentrification often sees a shift in a neighborhood's racial or ethnic composition and average household income as housing and businesses become more expensive and resources that had not been previously accessible are extended and improved. The gentrification process is typically the result of increasing attraction to an area by people with higher incomes spilling over from neighboring cities, towns, or neighborhoods. Further steps are increased investments in a community and the related infrastructure by real estate development businesses, local government, or community activists and resulting economic development, incr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Development-induced Displacement
Development-induced displacement and resettlement (DIDR) occurs when people are forced to leave their homes in a development-driven form of forced migration. Historically, it has been associated with the construction of dams for hydroelectric power and irrigation, but it can also result from various development projects such as mining, agriculture, the creation of military installations, airports, industrial plants, weapon testing grounds, railways, road developments, urbanization, conservation projects, and forestry. Development-induced displacement is a social problem affecting multiple levels of human organization, from tribal and village communities to well-developed urban areas. Development is widely viewed as an inevitable step towards modernization and economic growth in developing countries; however, for those who are displaced, the end result is most often loss of livelihood and impoverishment. Classification of development-induced displaced persons (DIDPs), refugees and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Displacement (parapsychology)
Parapsychology is the study of alleged psychic phenomena (extrasensory perception, telepathy, precognition, clairvoyance, psychokinesis (also called telekinesis), and psychometry) and other paranormal claims, for example, those related to near-death experiences, synchronicity, apparitional experiences, etc. Criticized as being a pseudoscience, the majority of mainstream scientists reject it. Parapsychology has also been criticised by mainstream critics for many of its practitioners claiming that their studies are plausible in spite of there being no convincing evidence for the existence of any psychic phenomena after more than a century of research. Parapsychology research rarely appears in mainstream scientific journals; instead, most papers about parapsychology are published in a small number of niche journals. Terminology The term ''parapsychology'' was coined in 1889 by philosopher Max Dessoir as the German . It was adopted by J. B. Rhine in the 1930s as a replacement ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Displacement (psychology)
In psychology, displacement (german: Verschiebung, lit=shift, move) is an unconscious defence mechanism whereby the mind substitutes either a new aim or a new object for goals felt in their original form to be dangerous or unacceptable. Freud The concept of displacement originated with Sigmund Freud. Initially he saw it as a means of dream-distortion, involving a shift of emphasis from important to unimportant elements, or the replacement of something by a mere illusion. Freud called this “displacement of accent.” Displacement of object: Feelings that are connected with one person are displaced onto another person. A man who has had a bad day at the office, comes home and yells at his wife and children, is displacing his anger from the workplace onto his family. Freud thought that when children have animal phobias, they may be displacing fears of their parents onto an animal. Displacement of attribution: A characteristic that one perceives in oneself but seems unacceptabl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Forced Displacement
Forced displacement (also forced migration) is an involuntary or coerced movement of a person or people away from their home or home region. The UNHCR defines 'forced displacement' as follows: displaced "as a result of persecution, conflict, generalized violence or human rights violations". A forcibly displaced person may also be referred to as a "forced migrant", a "displaced person" (DP), or, if displaced within the home country, an "internally displaced person" (IDP). While some displaced persons may be considered as refugees, the latter term specifically refers to such displaced persons who are receiving legally-defined protection and are recognized as such by their country of residence and/or international organizations. Forced displacement has gained attention in international discussions and policy making since the European migrant crisis. This has since resulted in a greater consideration of the impacts of forced migration on affected regions outside Europe. Various ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Displacement (linguistics)
In linguistics, displacement is the capability of language to communicate about things that are not immediately present (spatially or temporally); i.e., things that are either not here or are not here now. In 1960, Charles F. Hockett proposed displacement as one of 13 design features of language that distinguish human language from animal communication systems (ACSs): In animal communication systems Honeybees use the waggle dance to communicate the location of a patch of flowers suitable for foraging. The degree of displacement in this example remains limited when compared to human language. A bee can only communicate the location of the most recent food source it has visited. It cannot communicate an idea about a food source at a specific point in the past, nor can it speculate about food sources in the future. In addition, displacement in the waggle dance is restricted by the language's lack of creativity and productivity. The bees can express direction and distance, but it has ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Displacement (orthopedic Surgery)
A bone fracture (abbreviated FRX or Fx, Fx, or #) is a medical condition in which there is a partial or complete break in the continuity of any bone in the body. In more severe cases, the bone may be broken into several fragments, known as a ''comminuted fracture''. A bone fracture may be the result of high force impact or stress, or a minimal trauma injury as a result of certain medical conditions that weaken the bones, such as osteoporosis, osteopenia, bone cancer, or osteogenesis imperfecta, where the fracture is then properly termed a pathologic fracture. Signs and symptoms Although bone tissue contains no pain receptors, a bone fracture is painful for several reasons: * Breaking in the continuity of the periosteum, with or without similar discontinuity in endosteum, as both contain multiple pain receptors. * Edema and hematoma of nearby soft tissues caused by ruptured bone marrow evokes pressure pain. * Involuntary muscle spasms trying to hold bone fragments in place ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pole Shift Hypothesis
The cataclysmic pole shift hypothesis is a pseudo-scientific claim that there have been recent, geologically rapid shifts in the axis of rotation of Earth, causing calamities such as floods and tectonic events or relatively rapid climate changes. There is evidence of precession and changes in axial tilt, but this change is on much longer time-scales and does not involve relative motion of the spin axis with respect to the planet. However, in what is known as true polar wander, the Earth rotates with respect to a fixed spin axis. Research shows that during the last 200 million years a total true polar wander of some 30° has occurred, but that no rapid shifts in Earth's geographic axial pole were found during this period. A characteristic rate of true polar wander is 1° or less per million years. Between approximately 790 and 810 million years ago, when the supercontinent Rodinia existed, two geologically-rapid phases of true polar wander may have occurred. In each of these, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
