File Diffusionofideas.PNG thumb 330px The diffusion of innovations according to Rogers. With successive ... published Diffusion of Innovations . In the book, Rogers synthesized research from over 508 diffusion ... system on the basis of innovativeness. In the book Diffusion of Innovations , Rogers suggests a total ... participants in the diffusion of innovations are heterophilous, meaning they speak different languages ..., Integrating Models of Diffusion of Innovations, Barbara Wejnert details two categories for consequences ... on the actor itself. ref name autogenerated299 Wejnert, Integrating Models of Diffusion of Innovations ... Wejnert, Integrating Models of Diffusion of Innovations, p. 301 ref Costs may be monetary or nonmonetary ... waves and on diffusion of innovations. ref Cite journal last1 Marchetti first1 Cesare author1 ... 90 704.pdf postscript ref Criticism Much of the evidence for the diffusion of innovations gathered ... in order to simulate the diffusion of innovations. Veneris ref Veneris, Yannis 1984 . The Informational ..., and issues of equality ref Rogers, E. M. 2003 . Diffusion of innovations 5th ed. . New York, NY ... better diffusion of innovations, and with greater understanding of their possible shortcomings ... first Everett M. author link Everett Rogers year 1962 title Diffusion of Innovations publisher Free ... Everett M. last Rogers author link Everett Rogers title Diffusion of Innovations place New York publisher ... Barbara title Integrating Models of Diffusion of Innovations A Conceptual Framework journal Annual ... on diffusion of innovation particularly ICT in education DEFAULTSORT Diffusion Of Innovations Category ... reach the saturation level. In mathematics the S curve is known as the logistic function . Diffusion of Innovations is a theory that seeks to explain how, why, and at what rate new idea s and technology ... name Trans cultural see the article on Trans cultural diffusion or Roland Burrage Dixon 1928 The Building .... Earl Pemberton, ref Pemberton, H. E. 1936 The Curve of Culture Diffusion Rate , American Sociological ... more details
about the generic concept of the time dependent random process File Diffusion.svg thumb right A diffusion ... but diffusion will still continue to occur, just that there will be no net flux . Diffusion describes ... concentration. The time dependence of the statistical distribution in space is given by the diffusion equation . The concept of diffusion is tied to that of mass transfer driven by a concentration gradient, but diffusion can still occur when there is no concentration gradient but there will be no net flux . diffusion is invoked in the social sciences to describe the spread of ideas. Diffusion in physics In molecular diffusion , the moving entities are small molecules which are self propelled .... They move at random because they frequently collide. Diffusion is this thermal motion of all liquid and gas molecules at temperatures above absolute zero . Diffusion rate is a function of only temperature ... diffusion center.gif thumb 350px right The following image shows change in excess carriers being ... of an intrinsic semiconductor bar. Electrons have a higher diffusion constant than holes ... molecules is observable under a microscope, small molecule diffusion can only be probed in carefully controlled experimental conditions. Under normal conditions, molecular diffusion is relevant only ..., some often cited examples of diffusion are wrong If cologne is sprayed in one place, it will soon be smelled in the entire room, but a simple calculation shows that this cannot be due to diffusion ... evolution of the spatial distribution, which clearly indicates convection diffusion dominates only in perfect ... e.g. a metal spoon partly immersed in a hot liquid . This explains why the diffusion of heat was explained mathematically before the diffusion of mass. Other types of diffusion Anisotropic diffusion , also known as the Perona Malik equation, enhances high gradients Atomic diffusion , in solids. Eddy diffusion , in coarse grained description of turbulent flow Effusion of a gas through small holes ... more details
Context date October 2009 infobox company company name Digital Innovations company type Private company Private company logo Image DI logo.png center 200px Digital Innovations logo foundation 1995 location city Chicago, Illinois location country United States key people Gary Masching, small President and CEO small br Mike Dendo, small Executive Vice President, Sales and Marketing small br Kara Lineal small Marketing and New Products small br Joe Born , small Founder small industry Electronics products Electronics and Computer accessories homepage http www.digitalinnovations.com DigitalInnovations.com Digital Innovations is a consumer electronics company that produced the Skip Doctor SkipDR and Neuros product lines. It sells a relatively broad line of electronics and computer peripherals under the Digital Innovations, SkipDR, and Micro Innovations brands. Digital Innovations is distinguished by its use of open innovation Open Innovation and Crowd sourcing Crowd Sourcing ref Digital Innovations hosts DOC awards open call for inventors http www.allbusiness.com retail retailers electronics appliance retailing radio 5041948 1.html ref techniques in bringing products to market, as well as its prominent use of open source software and open source hardware Open Source Hardware . In its development ... concepts to Beta testing initial product releases. History Digital Innovations was founded by Joe ... and DVD scratch repair devices. In December 1998, Digital Innovations first product, the Skip Doctor ... outlets, primarily in North America In December 2003, the Neuros division of Digital Innovations was spun off into a separate entity, leaving Digital Innovations with the accessory brands including SkipDoctor ... 2009, Digital Innovations acquired Micro Innovations. ref Press Release on Micro Innovations acquisition ..., mice, and others. External links http www.digitalinnovations.com Digital Innovations http money.cnn.com ... 2.0 coverage of Digital Innovations References Reflist 2 US company stub Chicago stub Category ... more details
Infobox Company company name Luna Innovations company logo Image Luna Innovations logo.jpg Luna Innovations company type Public company Public NASDAQ LUNA foundation Blacksburg, Virginia 1991 location Roanoke, Virginia , USA key people Kent A. Murphy, Chairman and CEO industry Energy, Defense, Medical, Industrial, Telecommunications products Optical Analyzers, Reflectometers, Tunable Lasers, Optical Switches, Distributed Sensing Solutions homepage http www.lunainnovations.com http www.lunainnovations.com Luna Innovations Incorporated is a company that develops and manufactures products for the medical, telecommunications, energy and defense markets. It is headquartered in Roanoke, Virginia . Luna s products are used to measure, monitor, protect and improve processes. Luna Technologies is a division of Luna Innovations specializing in Luna branded products for fiber optic testing of components, modules and networks, as well as integrated optics and distributed sensing solutions. Our fiber optic test and measurement devices include optical analyzers, reflectometers, tunable lasers, optical switches and customized systems for strain, temperature, shape and position sensing. Luna s nanoWorks Division is developing nanomedicine s for diagnostic and therapeutic applications using Luna s exclusive ... s and secure computing using hardware based anti tamper technologies. Luna Innovations was founded ..., Virginia . It moved its headquarters to Roanoke in September 2006. Luna Innovations has four locations ... Charlottesville . Two companies developed from Luna Innovations have been sold to other companies ... by IHS Energy. Luna Innovations had an initial public offering in June 2006 with the NASDAQ trading symbol LUNA. External links http www.lunainnovations.com Luna Innovations Official Web site http www.lunatechnologies.com Luna Technologies , a division of Luna Innovations for fiber optic and sensing products http www.lunananoworks.com Luna nanoWorks , a division of Luna Innovations for nanomedical ... more details
Infobox Journal title Innovations cover File Innovationslowres.jpg editor Philip E. Auerswald, Iqbal Z. Quadir discipline Entrepreneurship abbreviation publisher MIT Press country United States frequency Quarterly history 2006 present openaccess impact impact year website http www.mitpressjournals.org ... name JSTOR OCLC 61688870 LCCN CODEN ISSN 1558 2477 eISSN 1558 2485 Innovations is a Peer review peer ... quarterly by the MIT Press . History Innovations published its first issue in 2006. It complements existing policy journals such as Foreign Affairs by focusing on micro level solutions, innovations, and entrepreneurship in a variety of organizational settings. ref Auerswald & Quadir 2006 The Innovations Journal Story, Policy Innovations. ref The editor in chief editors are Philip E. Auerswald ... and Entrepreneurship . Working with the Schwab Foundation for Social Entrepreneurship , Innovations ... of Positive Doing, special edition of Innovations for the 2008 and 2009 annual meeting of the World Economic Forum, http www.weforum.org pdf schwabfound Innovations SpecialEdition AnnualMeeting2008.pdf ..., special edition of Innovations for the 2008 World Economic Forum on the Middle East, http www.weforum.org pdf schwabfound INNOVATIONS World Economic Forum Middle East 2008 FINAL.pdf ref Structure of the journal Each issue of Innovations consists of four sections Lead essay. An authoritative ... Summers . Cases authored by innovators. Case narratives of innovations are authored either by, or in collaboration .... The development of meaningful indicators of the impact of innovations is an area of editorial ... Otero . Perspectives on policy. Analyses of innovations by large scale public actors national governments ... to facilitate and support innovations is an area of editorial focus. Authors in the perspectives ... authored by innovators A differentiating feature of Innovations is that the case about innovators ... authors of Innovations case narratives and discussions have included Seth Berkley , Larry Brilliant ... more details
Westport Innovations nasdaq WPRT , tsx WPT is a company founded in Vancouver , British Columbia , Canada in 1995 that researches and developments environmental technologies, such as products that allow diesel engine s to operate more cleanly. The company operates primarily in North America and Asia. ref cite web accessdate 2010 06 06 url http investing.businessweek.com research stocks snapshot snapshot article.asp?ticker WPT CN title Westport Innovations Inc. work BusinessWeek ref The company will greatly benefit from an energy law proposed by the United States Congress that includes several favorable provisions for natural gas vehicles. ref cite web accessdate 2010 06 06 url http www.businessweek.com ap financialnews D9FOINGO1.htm title Ahead of the Bell Westport Innovations downgraded work BusinessWeek date 2010 05 17 ref As of June 2010, the company has a market capitalization of about C 700 million, with revenues of about 120 million in 2008. ref cite web accessdate 2010 06 06 url http www.reuters.com finance stocks financialHighlights?symbol WPT.TO title Westport Innovations Inc. WPT.TO publisher Reuters ref References reflist External links http www.westport.com Official website Category Companies established in 1995 Category Companies listed on the Toronto Stock Exchange Category Technology companies of Canada Category S&P TSX Composite Index ... more details
Unreferenced date October 2010 Policy Innovations is an online magazine that covers how ethics and innovations can combine to form a fairer globalization . It is a nonprofit media venture housed at the Carnegie Council for Ethics in International Affairs in New York City . The project began in 2004 with funding from the Rockefeller Brothers Fund , and the magazine component launched on September 6, 2006. The magazine disseminates news analysis, commentary, interviews, audio, and innovative proposals for both reforming globalization and harnessing its power to lift people out of poverty. It also tells the success stories of NGOs and other social entrepreneurs, such as Nobel Prize winner Muhammad Yunus . The topics that appear frequently in Policy Innovations include human rights , the role of business and civil society , climate and environmental policy, the Asian economies , and cultural shifts brought about by globalization. Policy Innovations also maintains a database of organizations and individuals working on global social justice, as well as a library of academic papers on the economics of globalization and social change. Devin T. Stewart is the founding editor of Policy Innovations , and Evan O Neil is the managing editor. Contributors and Advisors David Abshire Philip Auerswald Harriet Babbit Steve Clemons Jean Marc Coicaud Jayati Ghosh Nikolas Gvosdev Sasha Issenberg Jomo K.S. Sherman Katz Rebecca MacKinnon Neela Marikkar Moises Naim Thomas Pogge Iqbal Quadir Mary Robinson Jeffrey Sachs Peter Singer Jerry Sternin Joseph Stiglitz External links http www.policyinnovations.org Policy Innovations http www.policyinnovations.org about overview About http www.cceia.org Carnegie Council Category Political magazines Category American online magazines Category Globalization Category Organizations based in New York City Category 2004 establishments in the United States Category Internet properties established in 2006 mag stub Website stub zh ... more details
self published date March 2008 Imperial Innovations is a United Kingdom British technology transfer and commercialization companies. The company was founded in 1986 and its ordinary shares admitted to trading on the Alternative Investment Market of London Stock Exchange plc in July 2006, raising 25 million at an offer price of 365p and 1 million by means of a public offer. The company s integrated approach encompasses the identification of ideas, protection of intellectual property, development and licensing of technology and formation, incubation and investment in technology businesses. A wide range of technologies are commercialised within the areas of healthcare, energy, environment and emerging technology trends. History On 4 November 2010 Prime Minister of the United Kingdom Prime Minister David Cameron revealed in a speech given in East London that Imperial Innovations had agreed to advise on the creation of an accelerator space for spinout companies at the Queen Elizabeth Olympic Park as part of the new East London Tech City hub. ref cite web url http www.number10.gov.uk news speeches and transcripts 2010 11 east end tech city speech 56602 title East End tech city speech publisher Number 10 accessdate 4 November 2010 ref Sources of Technology In April 2005 Imperial Innovations entered into a 15 year agreement with Imperial College London to commercialise technology derived from research at Imperial. Imperial Innovations also commercialises technologies originating from outside Imperial College through incubation contracts with the Carbon Trust and Waste & Resources Action Programme and has commercialisation contracts with a number of multinational corporations including BAE Systems . Spin out companies Imperial Innovations has established equity holdings in approximately 70 companies, the majority of which are spin out s arising from technologies developed at Imperial ... Innovations website Notes Reflist Imperial College London Category Imperial College London Category ... more details
Infobox Company name FibreTech Innovations logo type Private corporation genre fate predecessor successor foundation founder defunct location city Kingston location country Canada location locations area served Canada key people Andrew Jung & Matt Wong Pack Co CEOs industry Beverage products Corkup travel mug production services revenue operating income net income aum assets equity owner num employees parent divisions subsid homepage footnotes intl references FibreTech Innovations Ltd. also FT Innovations or FTI is a Canada Canadian private corporation which researches, develops, and manufactures products composed of natural fibre s. As of August 2009, its primary product is the Corkup, an environmentally friendly travel mug insulated with cork material which it sells across Canada . FT Innovations was founded in and remains headquartered in Kingston, Ontario , where it also has its primary assembly plant. Its current Co CEOs are Andrew Jung and Matt Wong Pack. History FibreTech Innovations was founded in Kingston, Ontario, where it still has its headquarters and main assembly plant for its CorKup mug. Since its foundation, it has expanded its operations from just Ontario to the rest of Canada , and plans to expand into the United States . Products and services Its products are all manufactured using the advantageous qualities of natural fibre s. Its Corkup line of travel mugs are Thermal insulation insulated with a layer of Cork material cork which insulates 40 times better than steel does, but also can hold cold drinks. The cork material is glazed with poly soy, a natural glaze. The layer of cork allows the mug to absorb shocks from being dropped similar to corking in baseball . FT Innovations at least partially uses recycled cork from items such as discarded wine toppers. See also Cork material External links http queens.siteignite.net fr Company website Category Canadian brands Category Drinkware Category Fibers Category Manufacturing companies of Canada ... more details
The innovations vector or residual vector is the difference between the measurement vector and the predicted measurement vector. Each difference represents the deviation of the observed random variable from the predicted response. The innovation vector is often used to check the validity of a mathematical model model . See also Errors and residuals in statistics Innovation signal processing Category Time series analysis Category Error Category Statistical terminology statistics stub ... more details
Advert date December 2007 Unreferenced date February 2007 Infobox Company company name Savage Innovations, LLC. company logo company type Private Company Private company slogan foundation 1983 Edmond, Oklahoma location Huntsville, Alabama key people Scott M Savage , President industry Technology products OOPic ooPIC , SoundGin homepage http www.savageinnovations.com www.savageinnovations.com Introduction Savage Innovations, LLC. is a privately held company in Huntsville, AL . Savage Innovations designs, manufactures, and sells OOPic ooPIC micro controllers, the soundgin SoundGin Sound Synthesizer, and educational curricula. Hardware Microcontrollers In 1997, the OOPic I micro controller module was released. The OOPic was so named because it was an Object Oriented Programmable IC. Computer program program med in BASIC , the OOPic I data encapsulation encapsulated the hardware components of the Microchip Technology Microchip PIC16C64 processor into Object computer science objects . The popularity of the OOPic I in the electronic hobbyists and education market drove the product line and in 2001, the OOPic II was released. The OOPic II expanded the object set past the simple encapsulations of the PIC16C64 s hardware. It included objects for driving controlling a wide variety of hardware devices like servo motors , sonars , etc. Each object was designed to work in a Computer multitasking multitasking fashion just as the PIC16C64 s hardware does. In 2002 and 2003, two new form factors were released. The OOPic R and the OOPic C. Sound synthesis In early 2004, Savage Innovations finished four year, co developed product with Magnevation called Speakjet . The Speakjet is a single chip voice synthesizer . Showcased at the 2006 Microchip MASTERs Conference, ref http techtrain.microchip.com USMASTERs Annual Microchip conference for embedded systems engineers ref the SoundGin Sound ... 6 , Savage Innovations, January, 2007 ref References references Category Companies based in Huntsville ... more details
Infobox album See Wikipedia WikiProject Albums Name Innovations Type studio Artist El Gran Combo de Puerto Rico Cover gran combo innovations.jpg Released 1984 Recorded Genre Salsa music Salsa Length 37 48 Label Combo Records Producer Last album In Alaska Breaking the Ice br 1984 This album Innovations br 1984 Next album Y Su Pueblo br 1986 Innovations is the title of a studio album released by Puerto Rican salsa group El Gran Combo de Puerto Rico on 1984. The album holds the distinction of being the first number one set on the Tropical Albums Billboard Tropical Albums . tracklist title1 Juan Cabeza Dura length1 4 38 title2 Camino de Amapolas length2 4 20 title3 No Me Olvides length3 4 55 title4 Resginaci n length4 4 47 title5 Prosigue length5 4 57 title6 A os length6 4 55 title7 Nunca Es Tarde length7 3 50 title8 La Loma del Tamarindo length8 5 16 Critical reception Album ratings rev1 Allmusic rev1Score Rating 3 5 ref Cite web title Album Review Innovations url Allmusic class album id r175781 pure url yes work Allmusic publisher Macrovision Corporation accessdate 2010 06 06 ref Jos A. Est vez, Jr. of Allmusic gave the album a mixed review criticizing the lack of novelties while stating Juan Cabeza Dura , No Me Olvides and La Loma del Tamarindo were servicable . Chart performance class wikitable align left Chart 1985 ref cite web title Innovations Chart performance url Allmusic class album id r175781 pure url yes work Allmusic publisher Macromedia Corporation accessdate 2010 06 06 ref align left Peak br position align left US Billboard Tropical Album align center 1 References Reflist Procession and succession s start succession box before None title U.S. Tropical Albums Billboard Tropical Albums List of number one Billboard Tropical Albums from the 1980s number one album years June 29, 1985 November 30, 1985 after Y Su Pueblo by El Gran Combo de Puerto Rico s end Category 1984 albums Category El Gran Combo de Puerto Rico albums Category Spanish language albums Category ... more details
Orphan date March 2009 Advert date May 2009 Infobox Organization name Dimensional Innovations formation 1993 type Private Company headquarters Overland Park , Kansas location United States key people http www.dimin.com full content.php?article id 768 Jim Baker , CEO br http www.dimin.com full content.php?article id 783 Tucker Trotter , President website http www.dimin.com Dimensional Innovations is a multi disciplinary firm taking ideas through design, fabrication and installation. The firm works to take their clients thoughts and concepts and then create thoese elements in the built environment. Their proven experience in various market segments includes cinemas, casinos, sports facilities, retail, government, hotels, hospitals, entertainment venues, museums and zoos. About Dimensional Innovations is made up of project developers and managers, designers, engineers, artists and fabricators. Their all inclusive shop houses a design team which translates obscure ideas into viable ideas an engineering department that make the ideas feasible and an expansive shop that allows the creation of installations with woods, metals, plastics, graphics, cutting edge A V and everything in between. ref http www.dimin.com ?page about who This is who we are ref Approach As a design and specialty fabrication firm, their team is able to approach projects in a unique and efficient way. From the beginning the project managers consider the project s application, design intent and budget. The collaborative approach at DI puts the designer, engineers, fabricators and estimators all around the same table. This ensures the highest quality and saves the client time and money. The complete in house team ... br Dimensional Innovations professionally photographed rare books and used software to modify ... Square. br Dimensional Innovations collaborated with Goodby Silverstein Partners to construct a 3 D ... to achieve the meticulous match of the metallic surrounding trim piece, Dimensional Innovations ... more details
, see the Wikipedia article piano . Acoustic and mechanical innovations Actions The Fandrich & Sons ... two related innovations to the upright piano. Their purpose is to obtain the largest possible soundboard ... Colani to produce other pianos of unconventional appearance. Digital innovations Digital technology ... more details
Wiktionarypar diffusionDiffusion most often refers to a time dependent random process causing a spread in space, see diffusion . In the physical sciences Molecular diffusion also commonly without additional ... Conduction of heat Diffusion of heat Momentum diffusionDiffusion of momentum Diffusion equation ... gradient Heat equation Eddy diffusion In physical sciences, more specific or modified meanings Diffusion MRI Diffusion acoustics Acoustic diffusion of sound waves Atomic diffusion Brownian motion , for example of a single particle in a solvent Collective diffusion , the diffusion of a large number of possibly interacting particles Facilitated diffusion Effusion of a gas through small holes Gaseous diffusion It diffusion Knudsen diffusion of particles from very small containers Osmosis Photon diffusion , an optical effect Diffuse reflection , the reflection of light from an uneven or granular surface Reverse diffusion Rotational diffusion Self diffusion Surface diffusion Thermodiffusion In the social sciences such as sociology , geography , or cultural anthropology Diffusion of innovations within a society or a culture or between them Lexical diffusion within a culture Trans cultural diffusion of culture items between cultures Spatial diffusion of an innovation, an artifact, or populations ... from an uneven or granular surface Diffusion cryptography , the spreading of influence of bits in a cipher Error diffusion in image processing In other areas Diffusion business , the process by which a new idea or new product is accepted by the market Diffusion process , in probability theory the solution to a stochastic differential equation Diffusion of responsibility Society for the Diffusion of Useful Knowledge The Diffusion Science Radio Show , a science radio show and podcast on 2SER in Sydney Diffusion Records , an independent record label Diffusion 7for4 album Diffusion 7for4 album , a music album by 7for4 See also Migration disambiguation Diffuse nebula disambig de Diffusion Begriffskl rung ... more details
for the marketing term Diffusion of innovations In probability theory , a branch of mathematics , a diffusion process is a solution to a stochastic differential equation . It is a continuous time Markov process with continuous function continuous sample paths. A sample path of a diffusion process mimics the trajectory of a molecule, which is embedded in a flowing fluid and at the same time subjected to random displacements due to collisions with other molecules, i.e. Brownian motion . The position of this molecule is then random its probability density function is governed by an advection equation advection diffusion equation . See also Sample continuous process It diffusion Category Stochastic processes math stub date May 2009 gl Teor a da difusi n ... more details
recognize that many elements of the diffusion process are unknown but explicitly incorporate probabilistic terms. See also Bass diffusion model Coolhunting Diffusion anthropology Diffusion of innovations ... New York Penguin. Rogers, Everett M. New Product Adoption and Diffusion . Journal of Consumer Research . Volume 2 March 1976 pp. 290 301. Rogers, Everett M. Diffusion of Innovations , 5th ed. . 2003 New ...Diffusion is the process by which a new idea or new product business product is accepted by the market . The rate of diffusion is the speed that the new idea spreads from one consumer to the next. Adoption is similar to diffusion except that it deals with the psychological processes an individual goes through, rather than an aggregate market process. In economics it is more often named technological change . Theories There are several theories that purport to explain the mechanics of diffusion Two step flow of communication The two step hypothesis information and acceptance flows, via the media, first to Opinion leadership opinion leaders , then to the general population the trickle down effect products tend to be expensive at first, and therefore only accessible to the wealthy social strata in time they become less expensive and are diffused to lower and lower strata The Everett Rogers Diffusion of innovations theory for any given product category, there are five categories of product ... acceptance model Technology driven models These are particularly relevant to software diffusion ... Image with unknown copyright status removed Image Diffusionadoption.jpg right thumb 260px The Diffusion of innovation diffusion curves of many household innovations, from the Federal Reserve Bank of Dallas, 1998 According to Everett M. Rogers, the rate of diffusion is influenced by The product .... Return on investment in the case of industrial products. Models There are several types of diffusion ... . In V. Mahajan & Y. Wind Eds. , Innovation Diffusion Models of New Product Acceptance ... more details
Thermal diffusion may refer to Uranium enrichment Thermal diffusion Thermal diffusion , an obsolete method of uranium enrichment Brownian motion at a constant non zero absolute temperature . Diffusion in a temperature gradient thermophoresis , also called thermodiffusion . See also Molecular diffusion Heat conduction i.e., diffusion of heat disambig ... more details
Unreferenced stub auto yes date December 2009 Orphan date December 2009 Reverse diffusion refers to a situation where the transport of particles atom s or molecule s in a medium occurs towards regions of lower concentration gradients, opposite to that observed during diffusion . This phenomenon occurs during phase matter phase separation and is described by the Cahn Hilliard equation . Reverse diffusion also refers to when water is forced from an region of lower concentration to high. DEFAULTSORT Reverse Diffusion Category Diffusion Physics stub cs Reverzn osm za ... more details
According to IUPAC definition, ref http goldbook.iupac.org S05582.html IUPAC Compendium of Chemical Terminology, 2nd edition ref self diffusion coefficient is the diffusion coefficient math D i math of species math i math when the chemical potential gradient equals zero. It is linked to the diffusion coefficient math D i math by the equation math D i D i frac partial ln c i partial ln a i . math Here, math a i math is the activity chemistry activity of the species math i math in the solution and math c i math is the concentration of math i math . This term is commonly assumed to be equal to the tracer diffusion determined by watching the movement of an Isotopic labeling isotope in the material of interest. See also Diffusion Molecular diffusion References reflist DEFAULTSORT Self Diffusion Category Diffusion physics stub pt Autodifus o ... more details
Jump diffusion is a stochastic process that involves jumps and diffusion. It has important applications in condensed matter physics and in option pricing . In physics In crystals, atomic diffusion typically consists of jumps between vacant lattice sites. On time and length scales that average over many single jumps, the net motion of the jumping atoms can be described as regular diffusion . Jump diffusion can be studied on a microscopic scale by inelastic neutron scattering and by M bauer spectroscopy . Closed expression for the self correlation function have been derived for several jump diffusion models Singwi, Sj lander 1960 alternation between oscillatory motion and directed motion Chudley, Elliot 1961 jumps on a lattice Sears 1966, 1967 jump diffusion of rotational degrees of freedom Hall, Ross 1981 jump diffusion within a restricted volume In economy In option pricing , a jump diffusion model is a form of mixture model , mixing a jump process and a diffusion process . Jump diffusion models have been introduced by Robert C. Merton as an extension of jump model s. Derivatives market Volatility Category Stochastic processes Category Options economics stub physics stub ... more details
Atomic diffusion is a diffusion process whereby the random thermally activated movement of atom s in a solid ... and the concentration gradient. In crystals Image Chemical surface diffusion slow.gif thumb 288px right Interstitial Atomic diffusion across a 4 coordinated lattice. Note that the atoms often block each other from moving to adjacent sites. As per Fick s law of diffusion Fick s law , the net ... . In the crystal solid state, diffusion within the crystal lattice occurs by either Interstitial defect interstitial or substitutional mechanisms and is referred to as lattice diffusion coefficient lattice diffusion ref P. Heitjans, J. Karger, Ed, Diffusion in condensed matter Methods, Materials, Models, 2nd edition, Birkhauser, 2005, pp. 1 965. ref . In interstitial lattice diffusion, a diffusant .... In substitutional lattice diffusion self diffusion for example , the atom can only move by substituting place with another atom. Substitutional lattice diffusion is often contingent upon the availability ... diffusion . Since the prevalence of point vacancies increases in accordance with the Arrhenius equation , the rate of crystal solid state diffusion increases with temperature. For a single atom in a defect ... of math Tt math math r sim sqrt Tt . math Diffusion in polycrystalline materials can involve short circuit diffusion mechanisms. For example, along the grain boundaries and certain crystalline defects such as dislocations there is more open space, thereby allowing for a lower activation energy for diffusion. Atomic diffusion in polycrystalline materials is therefore often modeled using an effective diffusion coefficient , which is a combination of lattice, and grain boundary diffusion coefficient s. In general, surface diffusion occurs much faster than grain boundary diffusion, and grain boundary diffusion occurs much faster than lattice diffusion. See also Kirkendall effect Mass diffusivity References reflist refbegin refend External links http dragon.unideb.hu zerdelyi Diffusion on the nanoscale ... more details
Unreferenced stub auto yes date December 2009 A diffusion filter is a translucent filter photography photographic filter used for a special effect . When used in front of the photographic lens camera lens , a photon diffusiondiffusion filter softens subjects and generates a dreamy haze . This can also be improvise d by smearing petroleum jelly on a UV filter or shooting through a nylon stocking . Diffusion filters may be uniform or may have a clear center area to create a vignetting vignette of diffused area around the clear center subject. Diffusion filters are also used in stage lighting and likewise in photography setups , where they may also be called diffusion gel , or just diffusion . This is a reference to color gel , which is another type of lighting gel . Diffusion gels soften the light in order to reduce or diffuse shadow s or glare . Silk sheets can also be used in this manner, and in fact were until the invention of translucent plastic s. Opal is a common translucent or opalescent diffusion. See also Diffuser optics Soft focus DEFAULTSORT Diffusion Filter Category Photography equipment Category Optical filters Category Photographic lighting Category Stage lighting Photography stub ... more details
Image GearDiagram.jpg thumb Schematic cutaway view of a diffusion hardened metal gear inline date September 2010 Diffusion hardening is a process used in manufacturing that increases the hardness of steels. In diffusion hardening, diffusion occurs between a steel with a low carbon content and a carbon rich environment to increase the carbon content of the steel and ultimately harden the workpiece. Diffusion ... may be performed on a diffusion hardened part to increase the hardness of the core as desired, but in most cases in which diffusion hardening is performed, it is desirable to have parts with a hard ... amounts of wear, such as gears, the non uniform properties acquired through diffusion hardening are desired ... and more impact resistant core. Process Diffusion hardening is performed by completely surrounding ... on the type of diffusion process being performed. The concentration of the diffusing element surrounding the part must be higher than the concentration of the element inside the part, or diffusion ... high for diffusion to occur. In the case of pack carburizing, the temperature must be 900 C and the part must be allowed to sit for 12 to 72 hours for the correct amount of diffusion to occur. Types Diffusion hardening can be done in many different ways to achieve different hardnesses and different surface finishes on metal parts. Some of the different diffusion hardening operations include Carburizing , Nitriding , Carbonitriding , Nitrocarburizing , Boriding , Titanium carbon diffusion , and Toyota diffusion . While diffusion hardening is performed mainly on steel parts and carbon is mainly the element used for diffusion, diffusion hardening can also be performed with other diffusion ... and diffusion elements used, diffusion hardening processes differ in the temperature required for diffusion, the phase of the diffusion element, and additional treatments such as quenching and tempering ... is inefficient. All these things must come into consideration when choosing a diffusion hardening ... more details
Knudsen diffusion is a means of diffusion that occurs in a long pore with a narrow diameter 2 50nm because molecules frequently collide with the pore wall. ref cite web url http sinnott.mse.ufl.edu Backgrounds theo02 diff.html title Transport in Small Pores accessdate 2009 10 20 ref Knudsen self diffusion In the Knudsen diffusion regime, the molecules do not interact with one another, so that they move in straight lines between points on the pore channel surface. Self diffusivity is a measure of the translational mobility of individual molecules. Under conditions of thermodynamic equilibrium, a molecule is tagged and its trajectory followed over a long time. If the motion is diffusive, and in a medium without long range correlations, the squared displacement of the molecule from its original position will eventually grow linearly with time Einstein s equation . To reduce statistical errors in simulations, the self diffusivity, Ds , of a species is defined from ensemble averaging Einstein s equation over a large enough number of molecules,N ref cite web first Knudsen Self and Fickian Diffusion in Rough Nanoporous Media url http www.uni leipzig.de diffusion pdf MalekCoppens JCP 031.pdf ref See also Knudsen Flow Knudsen number Diffusion References reflist Category Diffusion physics stub de Knudsen Diffusion pl Dyfuzja Knudsena pt Difus o de Knudsen ru ... more details
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