in the postsynaptic membrane. This small response 0.5mV is called a miniature endplatepotential ... potential on the postsynaptic membrane of the neuromuscular junction. Acetylcholine Endplate potentials ... are unable to measure a miniature endplatepotential MEPP . They are located in the parasympathetic ... E, Moyer M year 2005 title Modulation of biphasic reate of endplatepotential recovery in rat ... Fractal dimensions in the occurrence of miniature endplatepotential in a vertebrate neuromuscular ... depolarization of the postsynaptic membrane and become an endplatepotential. When the membrane reaches ... of eyelid droop Current research is attempting to learn more about endplate potentials and their effect on muscle activity. Many current diseases involve disrupted endplatepotential activity ... endplatepotential similar to what is seen in cases of myasthenia gravis. ref name Kohara cite journal ...Image Endspike.jpg thumb 500px Miniature endplate potentials and endplate spikes recorded from muscle fiber Endplate potentials EPPs sometimes called endplate spikes are the depolarizations of skeletal .... There are two types of ion channels involved in the neuromuscular junction and endplate potentials ... release their entire quantity of acetylcholine and this causes miniature endplate potentials MEPPs ... 1157&ndash 1169 ref Miniature EndPlate Potentials MEPPs Miniature endplate potentials are the small ... of giant or slow rising miniature endplate potentials at the neuromuscular junction journal Pflugers ... plate spikes in normal striated muscle without any stimulus. It was believed that these endplate spikes ... experiments have shown that these endplate spikes are actually caused by muscle spindles and have two distinct patterns small and large. Small endplate spikes have a negative onset without signal propagation and large endplate spikes resemble motor unit potentials MUPs . Muscle spindles are sensory ... 6 author Partanen J year 1999 title Endplate spikes in the human electromyogram. Revision of the fusimotor ... more details
Dablink For other words or senses of this term, see potential disambiguation . In linguistics, the Irrealis mood Potentialpotential mood The mathematic al study of potentials is known as potential theory it is the study of harmonic function s on manifold s. This mathematical formulation arises from the fact that, in physics, the scalar potential is irrotational , and thus has a vanishing Laplacian the very definition of a harmonic function. In physics , a potential may refer to the scalar potential or to the vector potential . In either case, it is a field physics field defined in space, from which many important physical properties may be derived. Leading examples are the gravitational potential and the electric potential , from which the motion of gravitating or electrically charged bodies may be obtained. Specific forces have associated potentials, including the Coulomb potential , the van der Waals potential , the Lennard Jones potential and the Yukawa potential . In electrochemistry there are Galvani potential and Volta potential . In Thermodynamics potential refers to thermodynamic potential . See also Potential difference Potential energy Category Potential es Potencial io Potencialo nl Potentiaal ja pl Potencja sl Potencial ... more details
Unsourced date March 2012 Infobox album Name The Potential Type Mixtape Artist Tyga Cover File Tyga The Potential.png Released Start date 2009 9 29 Recorded 2009 Genre Hip hop music Hip hop , Contemporary R&B R&B Length 48 30 Producer DJ Ill Will, DJ Rockstar, Tha Bizness, Jahlil Beats Last album Outrage & Underage br 2009 This album The Potential br 2009 Next album The Free Album br 2009 The Potential is a mixtape by Tyga created by producers DJ Ill Will and DJ Rockstar. It features other artists such as Lil Wayne . Track listing tracklist title1 The Potential length1 3 14 title2 Awesome length2 3 20 title3 Stop Accusing length3 5 32 title4 Where Am I length4 3 46 title5 Diddy Pop length5 1 51 title6 Tyzilla length6 3 43 title7 How Would You Like length7 3 09 title8 Dad s Letter length8 4 17 title9 Every Girl note9 featuring Lil Wayne length9 1 28 title10 Slow It Down length10 4 00 title11 Cut My Check length11 2 45 title12 My Glory length12 3 38 title13 RIP Dolla length13 2 16 title14 Wassup All Love length14 3 59 total length 48 50 References DEFAULTSORT Potential, The Category 2009 albums Category Tyga albums Category Mixtape albums ... more details
wiktionary TOC right Plate may refer to Plate dishware , a broad, mainly flat vessel on which food is served Silver household or the plate, dishware and cutlery made of sterling, Britannia, or Sheffield plate silver Plating , the deposition of metallic layers Science Plate electrode or plate, a type of electrode that formed part of a vacuum tube Plate, a physical approximation of a theoretical plate in separation processes Plate, an appendage of the Stegosauria Paleobiology Stegosauria Tectonic plate in geology Petri plate Wilhelmy plate , used to measure equilibrium surface or interfacial tension at an air liquid or liquid liquid interface Two dimensional media Photographic plate , an image capture medium Plate, an intaglio printmaking intaglio printing mechanism Plate, a printing mechanism in lithography Plate, a term in book design, meaning an image added on a separate page. This is derived ... in groups. Other Plate surname Plate, Germany , a municipality in Parchim, Mecklenburg Vorpommern, Germany Plate metal , rectangular metal stock that is more than 6 mm or 0.25 in thick To plate, to food presentation present food on a plate Approach plate , in aviation Dynamic compression plate , a metallic plate used in orthopedics for internal fixation of bone L plate , or learner plate, for a provisionally licensed vehicle driver or motorcycle rider Face plate Folding plate , in a folding machine Home plate , in baseball Service Specific Front Plate Wall plate , vertical building construction component Vehicle registration plate , or license plate See also lookfrom intitle River Plate disambiguation Plate armour , body armor made of metal plates Plate camera , early photographic cameras that used plates Plate theory , a continuum mechanics theory to explain thin solids Tourelle de la Plate , a lighthouse in France disambig de Plate Begriffskl rung fr Plate ja pt Plate ru sr vi M ng ... more details
Neuron Neurotransmission Postsynaptic Synapse Endplatepotential External links MeshName Postsynaptic ...Unreferenced date March 2007 Postsynaptic potentials are changes in the membrane potential of the postsynaptic terminal of a chemical synapse . Postsynaptic potentials are membrane potential graded potentials ... the terminal button at the end of an axon into the synaptic cleft . The neurotransmitters bind to Receptor ... to enter or leave the cell. It is these ions that alter the membrane potential. Ions are subject ... potential Equilibrium potentials equilibrium potential , which is the state where the diffusion ... potential, there is no longer a net movement of ions. Two important equations that can determine membrane potential differences based on ion concentrations are the Nernst equation Nernst Equation and the Goldman Equation . Relation to action potentials Neurons have a resting potential of about 70mV ..., the membrane is said to be depolarization depolarized , as the potential comes closer to zero. This is an excitatory postsynaptic potential EPSP , as it brings the neuron s potential closer to its firing ... of negative charge, this moves the potential further from zero and is referred to as hyperpolarization . This is an inhibitory postsynaptic potential IPSP , as it changes the charge across the membrane .... EPSPs and IPSPs are transient changes in the membrane potential, and EPSPs resulting from transmitter ... large fluctuations in membrane potential. If the postsynaptic cell is sufficiently depolarized, an action potential will occur. Action potentials are not graded they are all or none responses. Termination ... is returned to its equilibrium potential. Algebraic summation Postsynaptic potentials are subject to summation ... two excitatory postsynaptic potentials, they combine so that the membrane potential is depolarized by the sum ... potentials, they can cancel out, or one can be stronger than the other, and the membrane potential ... receives an excitatory postsynaptic potential, and then the presynaptic neuron fires again, creating ... more details
from the more general equation above determines the magnitude of an endplate current EPC , at a given membrane potential, in the neuromuscular junction math EPC g ACh V m E rev , math where EPC is the end ... membrane , the reversal potential also known as the Nernst potential of an ion is the membrane potential at which there is no net overall flow of that particular ion from one side of the membrane to the other. In the case of post synaptic neuron s, the reversal potential is the membrane potential ... ref In a single ion system, reversal potential is synonymous with equilibrium potential their numerical ... potential. Equilibrium refers to the fact that the net ion flux at a particular voltage is zero .... Reversal refers to the fact that a change of membrane potential on either side of the equilibrium potential reverses the overall direction of ion flux. ref name Purves The reversal potential is often called the Nernst potential , as it can be calculated from the Nernst equation . Ion channels conduct ... potential for that ion assuming the outside of the cell is at 0 volts . For example, the resting potential of most cells is close to the potassium K sup sup potassium ion reversal potential. This is because at resting potential, potassium conductance dominates. During a typical action potential ... number of sodium Na sup sup sodium ion channels, which brings the membrane potential close to the reversal potential of sodium. The relationship between the terms reversal potential and equilibrium potential only holds true for single ion systems. In multi ion systems, there are areas of the cell ... potential in the sense that membrane current reverses direction, it is not an equilibrium potential ... across the membrane. When a cell has significant permeabilities to more than one ion, the cell potential ... models The term driving force is related to equilibrium potential, and is likewise useful in understanding ... the actual membrane potential and an ion s equilibrium potential. It is defined by the following equation ... more details
Image Streamlines around a NACA 0012.svg thumb 300px right Potential flow Streamlines, streaklines, and pathlines ... and lower streamtube s identified. In fluid dynamics , potential flow describes the velocity field as the gradient of a scalar function the velocity potential . As a result, a potential flow is characterized ... is a valid approximation for several applications. The irrotationality of a potential flow is due ... flow the velocity potential satisfies Laplace s equation , and potential theory is applicable. However, potential flows also have been used to describe compressible flow s. The potential flow approach occurs in the modeling of both stationary as well as nonstationary flows. Applications of potential ... with strong vorticity effects, the potential flow approximation is not applicable. Characteristics and applications File Construction of a potential flow.svg thumb A potential flow is constructed by adding simple elementary flows and observing the result. Image Potential cylinder.svg thumb right Streamlines, streaklines, and pathlines Streamlines for the incompressible potential flow around a circular cylinder in a uniform onflow. Description and characteristics In fluid dynamics, a potential flow is described by means of a velocity potential , being a Function mathematics function of space and time. The flow velocity v is a vector field equal to the gradient, , of the velocity potential ... name B 99 101 math nabla times mathbf v mathbf 0 . math This implies that a potential flow is an irrotational flow . This has direct consequences for the applicability of potential flow. In flow regions where vorticity is known to be important, such as wake s and boundary layer s, potential flow theory ... is valid, which is why potential flow is used for various applications. For instance in flow ..., the velocity potential has to satisfy Laplace s equation ref name B 99 101 math nabla 2 varphi 0 ... the use of Bernoulli s principle . In two dimensions, potential flow reduces to a very simple system ... more details
Cell potential may refer to Membrane potential , the potential across the membrane of a biological cell Standard electrode potential , the potential between electrodes of an electrochemical cell disambiguation ... more details
Wiktionary potentialPotential may mean In mathematics and physics a Potential Scalar potential Vector potentialPotential function disambiguation In physics and engineering Potential energy Magnetic potential Electric potential Electromagnetic four potential Coulomb potential van der Waals potential Lennard Jones potential Yukawa potential In linguistics Irrealis mood PotentialPotential mood In biology Action potential Membrane potential Water potential In Television Potential Buffy episode Potential Buffy episode , an episode of Buffy the Vampire Slayer Potential and new Slayers , characters in Buffy the Vampire Slayer In philosophy Potentiality and actuality , a possibility that a thing can be said to have. Disambig ca Potencial cs Potenci l de Potential es Potencial fr Potentiel it Potenziale he ka lt Potencialas pl Potencja ujednoznacznienie ru simple Potential sv Potential ... more details
, the membrane potential will, at the end of the Na sup sup K sup sup tug of war, end up halfway between ...The relatively static membrane potential of quiescent cells is called the resting membrane potential or resting voltage , as opposed to the specific dynamic electrochemical phenomena called action potential and graded membrane potential . Apart from the latter two, which occur in Membrane potential excitable ... potential and dynamic voltage changes like action potential from biophysical point of view all ... ion channel s, ion transporter s, and exchangers. Conventionally, resting membrane potential can ... Any voltage is a difference in electric potential between two points for example, the separation .... The typical resting membrane potential of a cell arises from the separation of potassium ions ... relative permeability for potassium, the resulting membrane potential is almost always close to the potassium reversal potential . But in order for this process to occur, a concentration gradient ... membrane potential across an animal cell s cell membrane plasma membrane , potassium and sodium ... potential may be established by acidification of the inside of a membranous compartment such as the proton pump that generates membrane potential across synaptic vesicle membranes . Citation needed date January 2009 Electroneutrality In most quantitative treatments of membrane potential, such as the derivation ... charge excess in any side of the membrane. So, although there is an electric potential across ... involved in generating the resting potential below , that is, there is no actual measurable charge excess in either side. That occurs because the effect of charge on electrochemical potential is hugely ... change on electric potential. Generation of the resting potential Cell membranes are typically permeable ..., and others. To simplify the description of the ionic basis of the resting membrane potential, it is most ... to start. Image Membrane potential development.jpg thumb 400px A diagram showing the progression ... more details
In mathematics , the Newtonian potential or Newton potential is an Operator mathematics operator in vector ... rapidly enough at infinity. As such, it is a fundamental object of study in potential theory ... case of three variables , where it served as the fundamental gravitational potential in Newton s law of universal gravitation . In modern potential theory, the Newtonian potential is instead thought of as an electrostatic potential . The Newtonian potential of a compact support compactly supported ... 2 left x right & d 1 frac 1 2 pi log x & d 2 frac 1 d 2 d omega d x 2 d & d 2. end cases math Here ... harv Evans 1998 and harv Gilbarg Trudinger 1983 . The Newtonian potential w of is a solution of the Poisson ... potential of a function is a partial inverse to the Laplace operator. The solution is not unique ... regular domains, and for suitably well behaved functions one first applies a Newtonian potential ... data. The Newtonian potential is defined more broadly as the convolution math Gamma mu x int mathbb ..., when the measure is positive measure positive , the Newtonian potential is subharmonic function ... R d f y ,dy. math In dimension d 3, this reduces to Newton s theorem that the potential ... sub , then the Newtonian potential of is referred to as a simple layer potential . Simple layer ... of electrostatics in the context of the electrostatic potential associated to a charge distribution ... to the study of the Neumann problem for the Laplace equation. See also Double layer potential Green s function Riesz potential Green s function for the three variable Laplace equation References ... isbn 3 540 41160 7 . springer id n n066580 title Newton potential first E.D. last Solomentsev springer id s s085260 title Simple layer potential first E.D. last Solomentsev springer id s s091400 title Surface potential first E.D. last Solomentsev Category Harmonic functions Category Isaac Newton Category Partial differential equations Category Potential theory Category Singular integrals pt Potencial ... more details
The term potential function may refer to A mathematical function mathematics function whose values are a physical potential . The class of functions known as harmonic function s, which are the topic of study in potential theory . The potential function of a potential game . A function used in the potential method of amortized analysis to describe an investment of resources by past operations that can be used by future operations. mathdab ... more details
Image GravityPotential.jpg thumb 300px Plot of a two dimensional slice of the gravitational potential ... of the body. In classical mechanics , the gravitational potential at a location is equal to the Work ... moves to that location from a reference location. It is analogous to the electric potential with mass playing the role of charge physics charge . By convention, the gravitational potential is defined ... potential is also known as the Newtonian potential and is fundamental in the study of potential theory . Potential energy The gravitational potential V is the potential energy U per unit mass math U m V math where m is the mass of the object. The potential energy is the negative of the work .... If the body has a mass of 1 unit, then the potential energy to be assigned to that body is equal to the gravitational potential. So the potential can be interpreted as the negative of the work done by the gravitational ... constant. In that case, the difference in potential energy from one height to another is to a good ... form The Scalar potentialpotential V at a distance x from a point particle point mass of mass M is math V frac GM x , math where G is the gravitational constant . The potential has units of energy ... of the gravitational potential. Because the potential has no angular components, its gradient is math ... square law math mathbf a frac GM x 2 . math The potential associated with a mass distribution ... n sub and have masses m sub 1 sub , ..., m sub n sub , then the potential of the distribution at the point ... measure dm on three dimensional Euclidean space R sup 3 sup , then the potential is the convolution ... representing the density of the distribution at r , so that nowrap begin dm r &rho r dv r nowrap end , where dv r is the Euclidean volume element , then the gravitational potential is the volume integral ... is a potential function coming from a continuous mass distribution &rho r , then &rho can be recovered ... of distribution mathematics distribution s. As a consequence, the gravitational potential satisfies ... more details
A number plate may be a vehicle registration plate a plate attached to a locomotive indicating their number, particularly in the United Kingdom UK and Rail transport in Australia Australia , which are often collected as memorabilia . a plate attached to the front or sides of racing vehicle denoting the ranking level of the racer at the end of the previous racing season disambig ro Num r de nmatriculare ... more details
The term Potential analysis consists of the terms Potential and Analysis and describes the structural examination of specific characteristics and competencies. Potential analysis provide information about .... A company might analyze its own potential productivity, market position by comparing it to those of the competitors Benchmarking . A market can be analyzed to estimate its potential for a certain ... first Martin last Resch ref Quality criteria of a potential analysis The bases of a qualitative potential analysis are the following quality criteria that need to be fulfilled for any kind of potential analysis. Validity Validity should show that the used potential analysis tool is suitable ... Reliability in potential analysis means to make tests comparable. The potential analysis tools should ... should ensure that the results of potential analysis were not disturbed by personal influences ... pages 52 54 ref Potential Analysis in the Talent Management Importance of the potential analysis The Potential Analysis in Human resources is pioneering as a part of a goal and future oriented talent ... the potential analysis becomes even more important. Talents need to be acquired, their skills must be developed and in the end talents should be retained in companies. ref name becker2005p378 cite ... isbn 3834918113 page 15f. ref Objectives of potential analysis The objectives of potential analysis ... high potentials. Potential analysis are used to identify talents, who cannot be identified by school .... Using potential analysis, companies intend to achieve the optimal fit of individual job and organization ... criteria Subsequent selection criteria of potential analysis are going to be explained. The selection ... these characteristics are regarded as a part of an employee s potential. Because of the fact that these characteristics ... interactive criteria. The choice of the selection criteria is substantial to what extent potential analysis ... name steindl2003p2 Quality features of potential analysis In the preceding part quality criteria of potential ... more details
as the end in itself, then, it has been claimed to be morally objectionable to bring a potential ... of human potential and abilities, see Human Potential Movement . A potential future person in plural, sometimes termed potential people has been defined as an entity which is not currently a person ... possible conditions. ref name warren1977 Do Potential People Have Moral Rights? By Mary Anne Warren ... that potential people are able to be defined merely by the currently existing genetic material that will constitute ... being located in separate places. ref name warren1977 Potential people may also be defined from reproductive .... In this sense, the progression towards existence of a potential person usually lies mainly in the maturation of previous people to develop the will and ability to become potential parents. Also, in this sense, destroying e.g. sperm cells does not significantly reduce the number of potential persons ... potential persons. Also, if including the will to conceive as a necessary component of a potential ... as sufficient to disqualify that embryo as a potential person by definition, because a will that is strong ... may be regarded as creating a potential person rather than saving the life of one, but other ... can be expected to constitute a larger number of potential persons than a population refusing ... a potential person, that entity may still be termed a potential person except for... , but the ensuing ... as an example of potential persons, because, although their particular gamete s or embryo s do not currently ... name warren1977 The beginning of human personhood , where a potential person is instead regarded as a proper person, is a concept long debated by religion and philosophy. In the other end, the beginning of potential human personhood may not have any past limit at all, in the sense that it is dependent ... capability of the generation before that etc. etc. Value of potential persons It has been argued that the mere potential of becoming a person confers moral rights on a prima facie basis ... more details
automaticity of pacemaker cells, and the rate of change i.e., the slope of the pacemaker potential is what determines the timing of the next action potential and thus the intrinsic firing rate of the cell ... 7216 0076 X ref , the pacemaker potential is the main determinant of the heart rate. Because the pacemaker potential represents the non contracting time between heart beats diastole , it is also called ... potential during the pacemaker phase is extremely small, in the order of few pAs, but this net flux ... will end up firing at the SA node rate, not their intrinsic rate. The other foci attempt to fire ... The firing of the pacemaker cells is induced electrically by reaching the threshold potential of the cell membrane. The threshold potential is the potential an excitable cell membrane, such as a myocyte , must reach in order to induce an action potential. ref cite book last Campbell first Neil. A title ... rise to the action potential. ref name pmid19181406 cite journal author Verkerk AO, van Ginneken ... AO, Zegers JG, Van Ginneken AC, Wilders R title Dynamic action potential clamp as a powerful tool ... physiology References reflist DEFAULTSORT Pacemaker Potential Category Cardiac electrophysiology ... more details
The effective potential , or effective potential energy is a mathematical expression combining the centrifugal potential energy with the potential energy of a dynamical system . Commonly used in calculating the orbit s of planets both Newtonian mechanics Newtonian and general relativity relativistic , the effective potential allows one to reduce a problem to fewer dimension s. The units of the effective potential are kg m 2 s 2, the same as energy. For example, consider a particle of mass m orbiting a much heavier object of mass M . Assuming Newtonian mechanics can be used, and the motion of the larger mass is negligible, then the conservation of energy and angular momentum give two constants E and L , with values math E frac 1 2 m left dot r 2 r 2 dot phi 2 right frac GmM r , math math L mr 2 dot phi , math where r is the distance between the two masses, math dot r math is the derivative of r with respect to time, math dot phi math is the angular velocity of mass m , G is the gravitational constant , E is the total energy, and L is the angular momentum. Only two variables are needed, since the motion occurs in a plane. Substituting the second expression into the first and rearranging ... r math is the effective potential ref group Note A similar derivation may be found in José & Saletan ... applications the effective potential can be treated exactly like the potential energy of a one dimensional system for instance, an energy diagram using the effective potential determines turning points ... core potential Likos 2002, Baeurle 2004 and the screened Coulomb potential Likos 2001 . Notes ... to . for the cite to end in a . , as necessary. inconsistent citations . cite journal url http jcp.aip.org ... Effective Interactions of Micellar Aggregates of Ionic Surfactants with the Gauss Core Potential journal ... S0370 1573 00 00141 1 bibcode 2001PhR...348..267L issue 4 5 DEFAULTSORT Effective Potential Category Mechanics de Effektives Potential it Potenziale efficace he ... more details
Hidden Potential is a television series originally hosted by Peggy Bunker, but later hosted by Brandie Malay, that helps home buyers and viewers visualize what their dream home could look like before they buy it. The series premiered on HGTV on October 1, 2007. In each episode, a home buyer looks at three homes that need renovation in order to meet their needs for the house. As they tour each home, a design expert show the home buyer computer generated graphics that showcase the home s hidden potential. In the end, the home buyer chooses one to turn into their dream home. When the series initially started, Barry Wood interior designer Barry Wood was the design expert, however in later episodes Paige Rien , from another HGTV series Curb Appeal TV series Curb Appeal , is also seen in this role. Technology In the show the designer has a laptop with the software Home Design by software maker Chief Architect to show potential renovations and estimate costs on the spot. External links Official http www.hgtv.com hgtv shows hhdpo Category HGTV original programs Category American reality television series Category 2007 American television series debuts nonfiction tv prog stub ... more details
File Potential energy well.svg 200px right A potential well is the region surrounding a local minimum of potential energy . Energy captured in a potential well is unable to convert to another type of energy kinetic energy in the case of a gravity gravitational potential well because it is captured in the local minimum of a potential well. Therefore, a body may not proceed to the global minimum of potential energy, as it would naturally tend to due to entropy . Overview Energy may be released from a potential well if sufficient energy is added to the system such that the local minimum is surmounted. In quantum physics , potential energy may escape a potential well without added energy due to the probability probabilistic characteristics of quantum particle s in these cases a particle may be imagined to quantum tunneling tunnel through the walls of a potential well. The graph of a 2D potential energy function is a potential energy surface that can be imagined as the Earth s surface in a landscape of hills and valleys. Then a potential well would be a valley surrounded on all sides with higher terrain, which thus could be filled with water e.g., be a lake without any water flowing away toward another, lower minimum e.g. sea level . In the case of gravity , the region around a mass is a gravitational potential well, unless the density of the mass is so low that tidal force s from other masses are greater than the gravity of the body itself. A potential hill is the opposite of a potential well, and is the region surrounding a local maximum . Quantum confinement File Quantum confinement ... , one and two dimensional potential wells, respectively. In these cases they refer to the number ... 1 R 2 right end align math Under the assumption of spherical shape R1 R2 R and resolving Young Laplace ... band gap transition in InP nanocrystals ref See also Quantum well Finite potential well Quantum ... astr.gsu.edu hbase solids band.html c1 Band Theory of Solid reflist DEFAULTSORT Potential ... more details
Contact potential may refer to Contact electrification Electromotive force Contact potentials Galvani potential difference in electrochemistry, at a junction of two metals Volta potential difference in electrochemistry, between two points in vacuum near surfaces of two metals in contact Disambig ... more details
Potential evaporation or potential evapotranspiration PET is defined as the amount of evaporation that would occur if a sufficient water source were available. If the evapotranspiration actual evapotranspiration is considered the net result of atmospheric demand for moisture from a surface and the ability of the surface to supply moisture, then PET is a measure of the demand side. Surface and air temperatures, insolation, and wind all affect this. A dryland is a place where annual potential evaporation exceeds annual precipitation. Estimates of potential evaporation mm C. W. Thornthwaite Thornthwaite equation 1948 math PET 16 left frac L 12 right left frac N 30 right left frac 10 , T a I right alpha math Where math PET math is the estimated potential evapotranspiration cm month math T a math is the average daily temperature degrees Celsius if this is negative, use math 0 math of the month being calculated math N math is the number of days in the month being calculated math L math is the average day length hours of the month being calculated math alpha 6.75 times 10 7 I 3 7.71 times 10 5 I 2 1.792 times 10 2 I 0.49239 math math I sum i 1 12 left frac T ai 5 right 1.514 math is a heat index which depends on the 12 monthly mean temperatures math T ai math . ref name thornthwaite48 Cite journal doi 10.2307 210739 last Thornthwaite first C. W. title An approach toward a rational classification of climate journal Geographical Review volume 38 issue 1 pages 55 94 year 1948 url http www.unc.edu courses 2007fall geog 801 001 www ET Thornthwaite48 GeogrRev.pdf postscript Bot inserted parameter. Either remove it or change its value to . for the cite to end in a . , as necessary. inconsistent citations ref Somewhat modified forms of this equation appear in later publications 1955 and 1957 ... it or change its value to . for the cite to end in a . , as necessary. inconsistent citations ref Penman ... of potential evaporation. Category climate Category weather climate stub ... more details
Lead too short date September 2009 In quantum mechanics the delta potential is a potential that gives ... in a potential well defined by a Dirac delta function in one dimension. For those familiar with the particle in a box problem, the delta function potential well is a special case of the finite potential ... their product constant. Single Delta Potential Image Deltawell.png thumb right The time independent Schr dinger equation for the wave function x of a particle in one dimension in a potential physics potential V x is math frac hbar 2 2m frac d 2 psi dx 2 x V x psi x E psi x math where is the reduced Planck constant and E is the energy of the particle. The delta potential is the potential math ... potential well if is negative and a delta potential barrier if is positive. The delta has been ... any of the proceeding results. Solving the Schr dinger Equation The potential splits the space in two parts x 0 and x 0 . In each of these parts the potential energy is zero ... radic 2 mE . In general, due to the presence of the delta potential in the origin, the coefficients ... ikx , & text if x 0, end cases math where, in the case of positive energies real k , e sup ikx sup ... nowrap begin 0 sub L sub 0 sub R sub 0 nowrap end nowrap begin A sub r sub A sub l sub B sub r sub B sub l sub nowrap end , and by integrating the Schr dinger equation around x 0, over ... math begin cases A r A l B r B l & 0 A r A l B r B l & frac 2m lambda ik hbar 2 A r A l . end cases ... wavefunction solution to the delta function potential is continuous everywhere, but its derivative is not at x 0 . In any one dimensional attractive potential there will be a bound state . To find its ... R x B text r e k x , & text if x 0. end cases math From the boundary conditions and normalization conditions, it follows that math begin cases A r B l sqrt kappa kappa frac m lambda hbar 2 end cases ... R probability of a delta potential well. The energy math E 0 , math is in units of math ... more details
In electrostatics , the coefficients of potential determine the relationship between the electric charge charge and electrostatic potential electrical potential , which is purely geometric math begin matrix phi 1 p 11 Q 1 cdots p 1n Q n phi 2 p 21 Q 1 cdots p 2n Q n vdots phi n p n1 Q 1 cdots p nn Q n end matrix . math where Q sub i sub is the surface charge on conductor i . The coefficients of potential are the coefficients p sub ij sub . &phi sub i sub should be correctly read as the potential due to charge 1, and hence math p 21 math is the p due to charge 2 on charge 1. math p ij part phi i over part Q j left part phi i over part Q j right Q 1,...,Q j 1 , Q j 1 ,...,Q n , math or more formally math p ij frac 1 4 pi epsilon 0 S j int S j frac f j da j R ji . math Note that p sub ij sub p sub ji sub , by symmetry, and p sub ij sub is not dependent on the charge, The physical content of the symmetry is as follows if a charge Q on conductor j brings conductor i to a potential &phi , then the same charge placed on i would bring j to the same potential &phi . In general, the coefficients is used when describing system of conductors, such as in the capacitor . Theory div style float right text align center Image System of conductors.png br System of conductors. The electrostatic potential at point P is math phi P sum j 1 n frac 1 4 pi epsilon 0 int S j frac sigma j da j R j math . div Given the electrical potential on a conductor surface S sub i sub the equipotential surface or the point P chosen on surface i contained in a system of conductors j 1, 2, ..., n math phi i sum j 1 n frac 1 4 pi epsilon 0 int S j frac sigma j da j R ji mbox i 1, 2..., n , math where R sub ji sub ... R ji . math Example In this example, we employ the method of coefficients of potential to determine ... is math begin matrix phi 1 p 11 Q 1 p 12 Q 2 phi 2 p 21 Q 1 p 22 Q 2 end matrix . math On a capacitor ... begin matrix phi 1 p 11 p 12 Q phi 2 p 21 p 22 Q end matrix , math and math Delta phi phi 1 phi ... more details
In physics , a pair potential is a function that describes the potential energy of two interacting objects. Examples of pair potentials include the Coulomb s law in Classical electromagnetism electrodynamics , Newton s law of universal gravitation in mechanics , the Lennard Jones potential and the Morse potential . Pair potentials are very common in physics exceptions are very rare. An example of a potential energy function that is not a pair potential is the three body Axilrod Teller potential . Another example is the Stillinger Weber potential for silicon which includes the angle in a triangle of silicon atoms as a parameter. Category Mechanics physics stub ... more details
Encyclopedia
top
