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Encyclopedia results for Thermal expansion

Thermal expansion





Encyclopedia results for Thermal expansion

  1. Thermal expansion

    thermodynamics Material properties Thermal expansion is the tendency of matter to change in volume ... of thermal expansion and generally varies with temperature. Overview Predicting expansion If an equation of state is available, it can be used to predict the values of the thermal expansion ... called negative thermal expansion , rather than thermal contraction . For example, the coefficient of thermal expansion of water drops to zero as it is cooled to roughly 4 C and then becomes negative ... of sub zero weather. Also, fairly pure silicon has a negative coefficient of thermal expansion for temperatures ... of thermal expansion 22 v onepage&q silicon 20negative 20 22coefficient 20of 20thermal 20expansion ... 6 ref Factors affecting thermal expansion Unlike gases or liquids, solid materials tend to keep their shape when undergoing thermal expansion. Thermal expansion generally decreases with increasing Molecular ... likely to have lower thermal expansion. In general, liquids expand slightly more than solids. The thermal expansion of glasses is higher compared to that of crystals. ref Cite book first A. K ... in an amorphous material lead to characteristic discontinuities of coefficient of thermal expansion ... change size much more due to this effect than they do to thermal expansion. Common plastics exposed to water can, in the long term, expand many percent. Coefficient of thermal expansion The coefficient of thermal expansion describes how the size of an object changes with a change in temperature ... thermal expansion coefficient is the most basic thermal expansion coefficient. In general, substances .... General volumetric thermal expansion coefficient In the general case of a gas, liquid, or solid, the volumetric coefficient of thermal expansion is given by math alpha V frac 1 V , left frac ... engineering solids usually have coefficients of thermal expansion that do not vary significantly ... of expansion. Linear expansion The linear thermal expansion coefficient relates the change in a material ...   more details



  1. Negative thermal expansion

    Negative Thermal Expansion NTE is a physical chemistry physicochemical process in which some materials contract upon heating rather than thermal expansion expanding as most materials do. Materials which ... electronic , and structural applications. For example, if one were to mix a negative thermal expansion ... expansion composite material , such as Invar . Origin of Negative Thermal Expansion There are a number ... doi 10.1016 j.scriptamat.2011.07.001 title Origin of negative thermal expansion phenomenon in solids ... for materials with controlled thermal expansion properties, as thermal expansion causes many problems in engineering, and indeed in everyday life. One simple example of a thermal expansion problem ... containing a mixture of materials with positive and negative thermal expansion then the overall expansion ... Perhaps one of the most studied materials to exhibit negative thermal expansion is Cubic Zirconium ... Thermal Expansion from 0.3 to 1050 Kelvin in ZrW sub 2 sub O sub 8 sub journal Science date 1996 ... negative thermal expansion . Ordinary ice shows NTE in its hexagonal and cubic phases at very ... constants and thermal expansion of H2O and D2O ice Ih between 10 and 265 K journal Acta Crystallographica ... doi 10.1039 b002950p title The widespread occurrence of negative thermal expansion in zeolites journal ... thermal expansion in siliceous faujasite journal Chemical Communications year 1998 pages 601 602 doi 10.1039 A707141H issue 5 ref Fairly pure silicon has a negative coefficient of thermal expansion ... of thermal expansion 22 v onepage&q silicon 20negative 20 22coefficient 20of 20thermal 20expansion ... 10K to 1100K above which it shows the normal positive thermal expansion. ref name greve cite journal ..., Angus P. Wilkinson date 19 October 2010 title Pronounced negative thermal expansion from a simple ... Amos first3 T. G. last4 Sleight first4 A. W. title Strong Negative Thermal Expansion along the O ... J. last4 Dunn first4 B. title Thermal Expansion and Phase Formation of ZrW2O8 Aerogels journal Chemistry ...   more details



  1. Thermal expansion valve

    Image PHT.jpg thumb 300px Thermostatic expansion valve A thermal expansion valve often abbreviated as TEV, TXV or TX valve is a component in refrigeration and air conditioning systems that controls the amount of refrigerant flow into the evaporator thereby controlling the superheating at the outlet of the evaporator . Thermal expansion valves are often referred to generically as metering devices . Flow control, or metering, of the refrigerant is accomplished by use of a temperature sensing bulb filled with a similar gas as in the system that causes the valve to open against the spring pressure in the valve body as the temperature on the bulb increases. As the suction line temperature decreases, so does the pressure in the bulb and therefore on the spring causing the valve to close. An air conditioning system with a TX valve is often more efficient than other designs that do not use one. ref http books.google.com books?id eS 2UGJVA2EC&lpg PR8&ots bfW0x ObEc&dq TXV 20valve 20efficiency&pg PA445 v onepage&q TXV 20valve 20efficiency&f false ref A thermal expansion valve is a key element to a refrigeration cycle the cycle that makes air conditioning, or air cooling, possible. A basic refrigeration cycle consists of four major elements, a gas compressor compressor , a Heat exchanger HVAC air coils condenser , a metering device and an evaporator . As a refrigerant passes through a circuit containing these four elements, air conditioning occurs. The cycle starts when refrigerant enters the compressor in a low pressure, low temperature, gaseous form. The refrigerant is compressed by the compressor to a high pressure and temperature gaseous state. The high pressure and temperature gas ... temperature liquid then enters the expansion valve where the TX valve allows a portion of the refrigerant ... be limited into the evaporator to keep the pressure low and allow expansion back into the gas phase ... reading http www.central air conditioner and refrigeration.com thermostatic expansion valve.html ...   more details



  1. Thermal expansion coefficients of the elements (data page)

    Chemical elements data references Thermal expansion class wikitable × 10 sup 6 sup m m sup &minus 1 sup K sup &minus 1 sup colspan 2 3 Li 3 Li lithium style font weight bold use 46 CRC 46 LNG 46 WEL 46 colspan 2 4 Be 4 Be beryllium style font weight bold use 11.3 CRC 11.3 LNG 11.3 WEL 11.3 colspan 2 5 B 5 B boron style font weight bold use 5&ndash 7 LNG 5&ndash 7 WEL 6 colspan 2 6 C 6 C carbon style font weight bold use WEL 7.1 colspan 2 11 Na 11 Na sodium style font weight bold use 71 CRC 71 LNG 71 WEL 71 colspan 2 12 Mg 12 Mg magnesium style font weight bold use 24.8 CRC 24.8 LNG 24.8 WEL 8.2 colspan 2 13 Al 13 Al aluminium style font weight bold use 23.1 CRC 23.1 LNG 23.1 WEL 23.1 colspan 2 14 Si 14 Si silicon style font weight bold use 2.6 WEL 2.6 colspan 2 19 K 19 K potassium style font weight bold use 83.3 CRC 83.3 colspan 2 20 Ca 20 Ca calcium style font weight bold use 22.3 CRC 22.3 LNG 22.3 WEL 22.3 colspan 2 21 Sc 21 Sc scandium style font weight bold use room temperature alpha, polycrystalline 10.2 CRC 10.2 CR2 room temperature alpha, amorphous 7.6 CR2 room temperature alpha, crystalline 15.3 CR2 room temperature alpha, polycrystalline 10.2 LNG 10.2 WEL 10.2 colspan 2 22 Ti 22 Ti titanium style font weight bold use 8.6 CRC 8.6 LNG 8.6 WEL 8.6 colspan 2 23 V 23 V vanadium style font weight bold use 8.4 CRC 8.4 LNG 8.4 WEL 8.4 colspan 2 24 Cr 24 Cr chromium style font weight bold use 4.9 CRC 4.9 LNG 4.9 WEL 4.9 colspan 2 25 Mn 25 Mn manganese style font weight bold use 21.7 CRC 21.7 LNG 21.7 WEL 21.7 colspan 2 26 Fe 26 Fe iron style font weight bold use 11.8 CRC ... Touloukian, Y. S., Thermophysical Properties of Matter , Vol. 12, Thermal Expansion, Plenum, New York ... Edition . CRC Press. Boca Raton, Florida, 2003 Section 12, Properties of Solids Thermal and Physical Properties of Pure Metals Touloukian, Y. S., Thermophysical Properties of Matter , Vol. 12, Thermal Expansion, IFI Plenum, New York, 1975. CR2 As quoted in an online version of David R. Lide ed , CRC ...   more details



  1. Expansion

    wiktionary expand expansion Expansion may refer to tocright Physics Metric expansion of space Thermal expansion Prandtl Meyer expansion fan Computer programming Expand Unix Inline expansion Mathematics Expansion geometry Polynomial expansion Taylor expansion Expander graph expansion of a graph The converse of a reduct , in model theory or universal algebra Economics Economic expansion Expansionary policies Other uses Expansion card , in computer hardware Expansion pack , in gaming Expansion team , in sports Trinucleotide repeat disorder Trinucleotide repeat expansion disorder , in medicine, the result of expansion during DNA translation Expansion album Expansion album , by Dave Burrell Expansions album , an album by jazz pianist McCoy Tyner Expansion joint , in engineering Audio level expansion, in audio engineering Expansion, the spelled out meaning of an abbreviation or acronym initialism disambig cs Expanze da Ekspansion de Expansion eu Dilatazio fr Expansion hr Ekspanzija it Espansione nl Expansie ru sk Expanzia sv Expansion ...   more details



  1. Thermal

    about the atmospheric phenomenon other uses of the term thermal thermal disambiguation One source date July 2009 Image Thermal column.svg thumb Example of a thermal column between the ground and a cumulus A thermal column or thermal is a column of rising air in the lower altitudes of the Earth s atmosphere . Thermals are created by the uneven heating of the Earth s surface from solar radiation , and are an example of convection , specifically atmospheric convection . The Sun warms the ground, which in turn warms the air directly above it. ref cite book last Bradbury first Tom title Meteorology and Flight Pilot s Guide to Weather Flying & Gliding publisher A & C Black year 2000 id ISBN 0 7136 4226 2 ref Dark earth, urban areas and roadways are good sources of thermals. The warmer air expands, becoming less density dense than the surrounding air mass. The mass of lighter air rises, and as it does, it cools due to its expansion at lower high altitude pressures. It stops rising when it has cooled to the same temperature as the surrounding air. Associated with a thermal is a downward flow surrounding the thermal column. The downward moving exterior is caused by colder air being displaced at the top of the thermal. The size and power physics strength of thermals are influenced by the properties of the lower atmosphere the troposphere . Generally, when the air is cold, bubbles of warm air are formed by the ground heating the air above it and can rise like a hot air balloon. The air is then said to be unstable. If there is a warm layer of air higher up, an temperature inversion inversion ... by the presence of visible cumulus cloud cumulus clouds at the apex of the thermal. When a steady ... pilots. Cumulus clouds are formed by the rising air in a thermal as it ascends and cools, until ... docs thermals 2006.pdf What do thermals look like? Thermal Structure and Behavior by Wayne M. Angevine http bookergc.blogspot.com 2008 04 thermal formation and decay.html Time lapse video ...   more details



  1. Volume expansion

    Volume expansion may refer to Thermal expansion Increase of fluid in the blood. When reaching abnormally high levels, it is termed hypervolemia ref http www.prep4usmle.com forum thread 11546 Hyperosmotic volume contraction vs. expansion ref References reflist disambig ...   more details



  1. Expansion valve

    An expansion valve is a valve used for different purposes Steam engines A valve used to control the expansion of steam Expansion valve steam engine The best known of these was the Meyer expansion valve, the invention of Jean Jacques Meyer Thermodynamics A valve used to expand a gas, for thermodynamic cooling purposes in either Joule Thomson cooler heat pump Also Thermal expansion valve Category Valves disambig ...   more details



  1. Expansion joint

    dablink For the railway specific expansion joints, see Breather switch . File BridgeExpansionJoint.jpg thumb Expansion joint on a bridge An expansion joint or movement joint is an assembly designed to safely absorb the Thermal expansion heat induced expansion and contraction of various construction materials .... Pipe expansion joints are also known as compensators , as they compensate for the thermal movement ... as thermal expansion occurs. Bends in elbows also can accommodate this. Expansion joints also isolate ..., or due to other heat sources. Before expansion joint gaps were built into these structures, they would ... right thumb Saw cut control joints in concrete. Control joints often confused with expansion joints are cut into the concrete or asphalt, and are different from expansion joints as shown in the photo ... sealant such as rubber . clear Bridge expansion joints Bridge Expansion Joints, as shown .... Bridge expansion joints also allow enough vertical movement to allow bearing replacement ref .... retrieved 22 December 2011 ref without the need to dismantle the bridge expansion joint. There are various types of Bridge Expansion Joints that can accommodate movement from between 30 to 1000 mm these include small movement expansion joints JEP, WR and WOSd ,medium movement expansion joints Wd and large movement expansion joints WP . ref http www.freyssinet.co.uk pdfs products cipec expansion joints cv1 .pdf Freyssinet CIPEC Bridge Expansion Joints , Freyssinet Ltd. retrieved 21 December 2011 ref Pipe expansion joints File Flanged Rubber Bellows.jpg right thumb Single sphere rubber bellows expansion joint, with flange s. File Kompensator Rohr .jpg right thumb Stainless steel pipe expansion joint, with control rods. Pipe expansion joints are necessary in systems that convey high temperature ... of expansion joint for pipe systems is a bellows which can be manufactured from metal most commonly ..., and or angular deflections. Expansion joints are also designed for other criteria, such as noise ...   more details



  1. Expansion tank

    unreferenced date May 2010 Image Expansion tank.jpg thumb Expansion tank in central heating system. An expansion tank or expansion vessel is a small Water tank tank used to protect closed water heating systems and domestic hot water systems from excessive pressure. The tank is partially filled with air, whose compressibility cushions shock caused by water hammer and absorbs excess water pressure caused by thermal expansion . The modern vessel is a small container divided in two by a rubber Diaphragm mechanical device diaphragm . One side is connected to the pipe work of the heating system and therefore contains water. The other, the dry side, contains air under pressure, and normally a Schrader valve car tire type valve stem for checking pressures and adding air. When the heating system is empty or at the low end of the normal range of working pressure the diaphragm will be pushed against ... side. An older style of expansion tank is larger, oriented horizontally, and has no rubber diaphragm. Image Expansion vessel for boilers.jpg thumb left 108px alt expansion tank for boilers Expansion tank for boilers. When expansion tanks are used in domestic hot water systems, the tank and the diaphragm .... Thus, expansion tanks are now used more frequently than in the past. In the UK, prior to the use of sealed expansion tanks, open tanks were installed in the roof space to accommodate the water s expansion these had the disadvantage of being exposed to the cold air in the roof space. This, without ... tap s sometimes unpredictable. In Europe the design and the construction of expansion tanks are ruled by EN 13831 according to Pressure Equipment Directive PED 97 23 EC Image SaabHengine.jpg thumb Expansion tank in a 1987 Saab 90 br the brown plastic tank with white lid in top of picture . An expansion ... web url http www.expansiontank.org title About the Expansion Tank cite web url http highperformancehvac.com hot water boiler expansion tanks title HVAC Boiler Expansion Tanks DEFAULTSORT Expansion ...   more details



  1. Thermal conductance

    For Thermal conductance see Thermal contact conductance Thermal conduction Thermal conductivity List of thermal conductivities disambig ...   more details



  1. Joule expansion

    . Suppose that instead of letting the gas undergo a free expansion in which the volume is doubled, a free expansion in allowed which the volume expands by a very small amount dV. After thermal equilibrium is reached, we then let the gas undergo another free expansion by dV and wait until thermal ... with this expansion in great depth see e.g. Concepts in Thermal Physics , Blundell & Blundell, OUP ...Refimprove date July 2010 Image JouleExpansion.svg thumb 300px The Joule expansion, in which a volume math V 0 math is expanded in a thermally isolated chamber. The Joule expansion is an Irreversible process thermodynamics irreversible process in thermodynamics in which a volume of gas is kept in one side of a thermally isolated container via a small partition , with the other side of the container being evacuated the partition between the two parts of the container is then opened, and the gas fills the whole container. This process is a useful exercise in classical thermodynamics, as it is easy to work out the resulting increase in entropy . Description One mole unit mole of ideal gas at pressure math P i math and temperature math T i math is confined to the left hand side as drawn of a thermally isolated container, and occupies a volume math V 0 math . The right hand side of the container ... directly, because the route that the expansion takes in the time between the partition being opened and the equilibrium state being reached involves states that are far from thermal equilibrium ... the intermediary states are in thermal equilibrium. This means that such a route can only be realized ... , and hence the change in entropy for the Joule expansion is math Delta S int i f dS int V 0 2V 0 frac ... undergo a reversible adiabatic expansion in which the volume is doubled. The system will then perform ... it ends up in the same final state as in case of Joule expansion. During the reversible adiabatic expansion ... expansion has occurred, the gas is put back into the left hand side by compressing it. The best method ...   more details



  1. Expansion tunnel

    Expansion and shock tunnels are aerodynamic testing facilities with a specific interest in high speeds and high temperature testing. Shock tunnels use steady flow nozzle expansion whereas expansion tunnels use unsteady expansion with higher enthalpy , or thermal energy. In both cases the gases are compressed and heated until the gases are released, expanding rapidly down the expansion chamber. The tunnels reach speeds from Mach 3 to Mach 30 to create testing conditions that simulate hypersonic to re entry flight. These tunnels are used by military and government agencies to test hypersonic vehicles that undergo a variety of natural phenomenon that occur during hypersonic flight. ref Stalker R.J. Modern developments in hypersonic wind tunnels, The Aeronautical Journal January 2006 ref Expansion Process Expansion Tunnel Expansion tunnels use a dual diaphragm system where the diaphragms act as rupture discs, or a pressure relief. The tunnel is separated into three sections drive, driven, and acceleration. The drive section is filled with high pressure helium gas. The driven section is filled with a lower pressure desired test gas, such as carbon dioxide, helium, nitrogen, or oxygen.. The acceleration ... Transfer Measurements in an Expansion Tube, AIAA Paper 96 2240 New Orleans, LA 19th AIAA Advanced ... X Ground Test Program, Langley Research Center 1999 ref Testing During the expansion process, a variety of test are run to analyze the aerodynamic and thermal properties of the test vehicle. Skin ... to withstand deterioration. Turbulence The disordered movement of fluids. Heat transfer The thermal ... of air and the manner in which air bends around the object. Thermal protection The ability to withstand ... RST and Shock Expansion Tunnel SET . HYPULSE RST generates speeds from Mach 5 to 10, whereas the HYPULSE ... Pulsonetti, Maria Erdos, John, Hypervelocity Real Gas Capabilities of GASL s Expansion Tube HYPULSE ... HyCause RRSS LENS X LENS X is an 8 foot diameter by 100 foot expansion tunnel with a top speed of Mach ...   more details



  1. Expansion draft

    An expansion draft , in professional sports , occurs when a sports league decides to create one or more new expansion team s or sports franchising franchise s. This occurs mainly in North American sports. One of the ways of stocking the new team or teams is an expansion draft. Although how each league ... by furnishing their names to the league office on or before a certain date. The expansion team ... they truly need on the protected list. This means that the expansion franchise is usually left to choose ... so highly compensated that a team wishes to remove them from the payroll. For this reason, expansion ... teams this process is referred to as a dispersal draft . Expansion Drafts Baseball Baseball expansion was initially hastened by the threat of a competing league, known as the Continental League . 1960 Major League Baseball expansion draft 1961 Major League Baseball expansion draft 1968 Major League Baseball expansion draft 1976 Major League Baseball expansion draft 1992 Major League Baseball expansion draft 1997 Major League Baseball expansion draft Basketball 1961 NBA Expansion Draft 1966 NBA Expansion Draft 1967 NBA Expansion Draft 1968 NBA Expansion Draft 1970 NBA Expansion Draft 1974 NBA Expansion Draft 1980 NBA Expansion Draft 1988 NBA Expansion Draft 1989 NBA Expansion Draft 1995 NBA Expansion Draft 2004 NBA Expansion Draft 2006 NBA Development League Expansion Draft 2007 NBA Development League Expansion Draft 2008 NBA Development League Expansion Draft 2009 NBA Development League Expansion Draft 2010 NBA Development League Expansion Draft Football 1960 NFL Expansion Draft 1961 NFL Expansion Draft 1966 NFL Expansion Draft 1967 NFL Expansion Draft 1976 NFL Expansion Draft 1995 NFL Expansion Draft 1999 NFL Expansion Draft 2002 NFL Expansion Draft 2012 CFL Expansion Draft Hockey 1967 NHL Expansion Draft 1970 NHL Expansion Draft 1972 NHL Expansion Draft 1974 NHL Expansion Draft 1979 NHL Expansion Draft 1991 NHL Dispersal and Expansion Drafts 1991 NHL Expansion Draft 1992 ...   more details



  1. Expansion chamber

    mergefrom Tuned pipe discuss Talk Tuned pipe Merge to Expansion chamber date May 2012 refimprove date April 2009 An expansion chamber is an exhaust system used on a two stroke cycle engine to enhance its ... Exhaust with minimal expansion chamber.jpg right thumb 4 stroke motorcycle, with minimal expansion chamber, visible near the boot History Expansion chambers were first designed by East German Walter ... in Cylinder head porting Wave dynamics wave dynamics . An expansion chamber makes use of this phenomenon ... of an expansion chamber in operation. It does a good job illustrating the positive portion ... pipe. There are three main parts to the expansion cycle. Blowdown When the descending piston first ... without assistance from the expansion chamber and so the diameter area over the length of the first ..., the energy in the wave is preserved because there is no expansion until needed later in the cycle ... energy from the expansion chamber can be used to aid the flow of fresh mixture into the cylinder. To do this the expansion chamber is increased in diameter so that the out going high pressure ... port a strong high pressure wave from the expansion chamber is timed to arrive during the compression ... of expansion chambers in practice is not as straightforward as the fundamental process described ... expansion chamber over each cycle, the actual gases leaving the cylinder during a particular ... has had too much resident time and mixing with gas from other cycles causing errors in analysis. Expansion ... must be kept to a minimum to avoid unpredictable losses. Calculations used to design expansion ... can occur due to these complicating factors. How expansion chambers are made There are three main methods of fabricating expansion chambers. Hand forming Flat sheet metal is rolled into cones and round ... only for mass production. Note Functionally, expansion chambers need not be round in cross ... need to be synchronized with the engine port timings and speed. An expansion chamber tuned for 8,000 ...   more details



  1. Thermal shock

    point . Thermal shock occurs when a thermal gradient causes different parts of an object to coefficient of thermal expansion expand by different amounts. This differential expansion can be understood ... to fail. Failure due to thermal shock can be prevented by Reducing the thermal gradient seen by the object, by changing its temperature more slowly increasing the material s thermal conductivity Reducing the material s coefficient of thermal expansion Increasing its strength Introducing built ... can resist, math alpha math is the thermal expansion coefficient math E math is the Young s modulus ... of heat occurs at certain temperature gradient . The non uniform thermal expansion of a bulk material ...Mechanical failure modes Thermal shock is the name given to extreme temperature difference gradient across ... vulnerable to this form of structural failure failure , due to their low toughness and low thermal ... crack deflection Effect on materials Borosilicate glass is made to withstand thermal shock better than most other glass through a combination of reduced expansion coefficient and greater strength ... in LAS glass ceramic LAS system ref Scott L. Swartz, Ceramics having negative coefficient of thermal expansion, method of making such ceramics, and parts made from such ceramics , United States Patent 6066585 ref include a controlled proportion of material with a negative expansion coefficient, so .... Reinforced carbon carbon is extremely resistant to thermal shock, due to graphite s extremely high thermal conductivity and low expansion coefficient, the high strength of carbon fiber , and a reasonable ability to deflect cracks within the structure. To measure thermal shock the impulse ... be measured after different thermal shock cycles and this way the detoriation in physical properties can be mapped out. Relative robustness of materials The robustness of a material to thermal shock is characterized with the thermal shock parameter ref name ThermalShok cite journal title Spectroscopic ...   more details



  1. Gene expansion

    Gene expansion may refer to Insertion genetics Trinucleotide repeat , sometimes classified as a subgroup of insertions. disambig ...   more details



  1. Lateral expansion

    Unreferenced stub auto yes date December 2009 Orphan date December 2009 Lateral expansion sometimes known as horizontal expansion , in economics , is the growth of a business enterprise through the acquisition of similar companies, in the hope of achieving economies of scale or economies of scope . Unchecked lateral expansion can lead to powerful Conglomerate company conglomerates or monopolies . Related is vertical expansion , which is the growth of a business enterprise through the acquisition of companies that produce the intermediate goods needed by the business or help market and distribute its final goods . Any such value chain activities can be acquired through vertical expansion. DEFAULTSORT Lateral Expansion Category Business economics Econ stub ...   more details



  1. Thermal conductivity

    anharmonic effects are the thermal expansion and the phonon thermal conductivity. Only when the phonon ...In physics , thermal conductivity , math k math or denoted math lambda math , is the List of materials ... of high thermal conductivity occurs at a higher rate than across materials of low thermal conductivity. Correspondingly materials of high thermal conductivity are widely used in heat sink applications and materials of low thermal conductivity are used as thermal insulation . Thermal conductivity of materials is temperature dependent. The reciprocal of thermal conductivity is thermal resistivity. Units of thermal conductivity In the International System of Units SI , thermal conductivity is measured ... thermal conductivity is measured in Btu hr ft F where 1 Btu hr ft F 1.730735 W m K . ref Perry s Chemical Engineers Handbook, 7th Edition, Table 1 4 ref Other units which are closely related to the thermal ... industry makes use of units such as the R Value resistance value and the U Value thermal transmittance . Although related to the thermal conductivity of a product R and U values are dependent on the thickness ... and the Thermal Comfort Clo which express thermal resistance of a material in a way analogous to the R ... based on the SI units of measurement . Measurement main Thermal conductivity measurement There are a number of ways to measure thermal conductivity. Each of these is suitable for a limited range of materials, depending on the thermal properties and the medium temperature. There is a distinction .... Experimental values File Thermal conductivity.svg thumb 550px Experimental values of thermal conductivity. main List of thermal conductivities Thermal conductivity is important in material science ... standards. Several materials are shown in the list of thermal conductivities . These should be considered ... for computer cooling or turbine blades usually use high thermal conductive materials such as silver ... low thermal conductive materials such as polystyrene and alumina are used to separate warm hot ...   more details



  1. Ciphertext expansion

    unreferenced date April 2010 In cryptography , the term ciphertext expansion refers to the length increase of a message when it is encryption encrypted . Many modern cryptosystems cause some degree of expansion during the encryption process, for instance when the resulting ciphertext must include a message unique Initialization Vector IV . Probabilistic encryption schemes cause ciphertext expansion, as the set of possible ciphertexts is necessarily greater than the set of input plaintexts. Certain schemes, such as Cocks Identity Based Encryption , or the Goldwasser Micali cryptosystem result in ciphertexts hundreds or thousands of times longer than the plaintext. Ciphertext expansion may be offset or increased by other processes which compress or expand the message, e.g., data compression or error correction codes error correction coding . Category Cryptography crypto stub ...   more details



  1. Expansion pack

    For the Nintendo 64 add on Nintendo 64 accessories Expansion Pak Refimprove date December 2009 Deleted ... was one of the first video game expansion packs. deletable image caption 1 Monday, 13 April 2009 An expansion pack , expansion set , or supplement is an addition to an existing role playing game ... of the expansion pack to a third party company, see Diablo Hellfire Hellfire for Diablo computer game Diablo , it may choose to develop the expansion itself or it may do both Ensemble Studios developed the real time strategy game Age of Empires III and the first expansion called Age of Empires III The WarChiefs the WarChiefs itself, but contracted Big Huge Games for the second expansion pack, the Asian ... games have been releasing expansion packs since the 1980s, early examples being the Dragon ... , October 30, 2010 ref Summary The price of an expansion pack is usually much less than that of the original game. As expansion packs consist solely of additional content, most expansion packs ... subsequent expansions. Stand alone expansion packs Some expansion packs do not require the original ... . In some cases, a standalone expansion such as Heroes of Might and Magic III The Shadow of Death ... standalone packs if someone does not have the original or previous expansion packs, then they can t use certain units or races contained in the other games in multiplayer. Console game expansion packs Expansion packs are most commonly released for computer games , but are becoming increasingly prevalent ... to the release of more expansion packs on consoles, especially stand alone expansion packs as described ... expansion pack released for the PlayStation . The game required the player to insert the London ... Drive Genesis was unusual in that it functioned as both a stand alone cartridge and as an expansion ... 2010 Reflist Use dmy dates date February 2011 DEFAULTSORT Expansion Pack Category Video game expansion ... ru simple Expansion Pack fi Lis levy sv Expansionspaket th ...   more details



  1. Expansion path

    File Expansion path.jpg right 300px Expansion path is the red line connecting each optimal input combination. In economics , an expansion path also called a scale line ref name jain Jain, TR Khanna OP 2008 . Economics. VK Publications, ISBN 978 81 87344 77 3 ref is a line connecting optimal input combinations as the scale of production expands. ref name Hirschey Hirschey, Mark 2008 . Managerial economics. Cengage Learning, ISBN 978 0 324 58886 6 ref A producer seeking to produce the most units of a product in the cheapest possible way attempts to increase production along the expansion path. ref name prusty Prusty, Sadananda 2010 . Managerial Economics. PHI Learning Pvt. Ltd., ISBN 978 81 203 4094 7 ref Economists Alfred Stonier and Douglas Hague defined expansion path as that line which reflects least cost method of producing different levels of output, when factor prices remain constant. ref name Stonier Stonier, Alfred W. Hague, Douglas C. 1980 . A textbook of economic theory, 5th edition. Longmans ISBN 978 0 582 29530 8 ref The points on an expansion path occur where budget level and the purchaser s indifference curve are tangent s. As a producer s budget level increases, each of these points can be connected in a line. A line joining tangency points of isoquants and isocosts with input price s held constant . ref name Salvatore Salvatore, Dominick 1989 . Schaum s outline of theory and problems of managerial economics. McGraw Hill, ISBN 978 0 07 054513 7 ref If an expansion path forms a straight line, the production technology is considered homothetic or homoethetic . ref name Rasmussen Rasmussen, Svend 2011 . Production Economics The Basic Theory of Production Optimisation. Springer, ISBN 978 3 642 14609 1 ref In this case, the ratio is always the same, and the inputs can be adjusted based on this ratio for any budget. A Cobb Douglas production function has an expansion ... expansion path economics stub Category economics ...   more details



  1. Team Expansion

    Infobox Non profit Non profit name Team Expansion Non profit logo Image Team expansion logo plain.gif 200px A Team Expansion worker shares Christ, the Hope of Glory Non profit type Christian Missions Agency ... homepage http www.teamexpansion.org dissolved footnotes Team Expansion is a non profit ... transforming communities among the unreached by planting Biblical churches. Many Team Expansion workers are associated with the Restoration Movement of churches, but as an agency, Team Expansion is non denominational. File Sharingchrist.jpg 200px left A Team Expansion team leader shares his faith a new friend it s part of our passion for the glory of Christ. History Team Expansion began as a prayer ... to Montevideo, Uruguay to start the very first Team Expansion work. In 1983, International Services ... Bible College, now known as Cincinnati Christian University . Between 1985 and 1996, Team Expansion ..., the leadership of Southeast Christian Church Louisville, Kentucky invited Team Expansion to move ... us history work Team Expansion publisher Team Expansion accessdate 02 21 12 ref As of February 2012, Team Expansion currently consists of more than 320 full time adult workers serving in 48 countries ... title About Us url http web.teamexpansion.org about us work Team Expansion publisher Team Expansion ... other ways. True to its core vision, Team Expansion has planted about 250 churches and has ushered over 12,000 new believers into a relationship with Jesus Christ. Mission Team Expansion is transforming ... url http web.teamexpansion.org about us at a glance work Team Expansion publisher Team Expansion accessdate 02 21 12 ref Partnerships and Projects Team Expansion participates with the http www.nationalmissionaryconvention.org ... 38241 work Unleashed for the Unreached publisher Team Expansion accessdate 02 21 12 ref . Several Team Expansion leaders were involved in the decision to create the Restoration Revolution 10 year ... Revolution publisher Restoration Revolution accessdate 02 21 12 ref Team Expansion participated ...   more details



  1. Economic expansion

    An economic expansion is an increase in the level of economic activity , and of the goods and services available in the market market place . It is a period of economic growth as measured by a rise in real GDP . ref cite book last O Sullivan first Arthur coauthors Steven M. Sheffrin title Economics Principles in action publisher Pearson Prentice Hall date 2003 location Upper Saddle River, New Jersey 07458 pages 310 url http www.pearsonschool.com index.cfm?locator PSZ3R9&PMDbSiteId 2781&PMDbSolutionId 6724&PMDbCategoryId &PMDbProgramId 12881&level 4 doi id isbn 0 13 063085 3 ref The explanation of such fluctuations in aggregate economic activity is one of the primary concerns of macroeconomics . Typically an economic expansion is marked by an upturn in production and utilization of resources. Economic recovery and prosperity are two successive phases of expansion. It may be caused by factors external to the economy, such as weather conditions or technical change, or by factors internal to the economy, such as Fiscal policy fiscal policies , Monetary policy monetary policies , the availability of Credit finance credit , interest rates , Regulation regulatory policies or other impacts on producer incentives. Global conditions may influence the levels of economic activity in various countries. Economic contraction and expansion relate to the overall output of all goods and services, while the terms inflation and deflation refer to increasing and decreasing prices of commodities, goods and services in relation to the value of money. Expansion means enlarging the scale of a company. The ways of expansion include internal expansion and integration. Internal expansion means a company enlarges its scale through opening branches, inventing new products, or developing new businesses. Integration means a company enlarges its scale through taking over or merging with other companies. See also Business cycle Economic growth References Reflist External links http www.nber.org cycles.html ...   more details



  1. CNN Expansion

    Unreferenced date December 2008 Infobox Company company name Expansion, S.A. de C.V. company type a Company of Time Inc. foundation 1966 location city Mexico City location country Mexico key people John Reuter CEO publications 15 industry Publishing revenue 60 Million U.S. dollar USD homepage http www.cnnexpansion.com CNN Expansion is a vertically integrated news portal resulting from the merger of news channel CNN and the business magazine Expansion, with its content mainly targeting businessmen and entrepreneurs of business in Mexico and Latin America . During the last few years CNNExpansion.com has strongly positioned in the Latin American business environment, in that beyond being a printed magazine or a website associated with this, it has developed a strategy of media coverage on the Web including blogs, forums, video and much more. With 40 years as Mexico s most important business magazine. Expansion was presenting the best stories consolidates business with a fair and transparent vision of the great figures in this field. Grupo Editorial Expansion GEE , its parent company, was founded in 1966. In 2005, it became part of Time Inc. , the largest publishing company in the world, with more than 140 titles, many of them bestsellers worldwide. In Mexico GEE is the most important editorial directed at targeted audiences and business with a clear mission to revolutionize the standards of the publishing industry in the country and Latin America. Under this paradigm, the company has grown significantly over the past eight years, from 4 to 18 magazines and 4 of internet portals that are translated into more than 6.3 million readers and 2 million visits per month over the Internet. Acquisition of Mexico s Grupo Editorial Expansion by Time Inc. Time Inc. has acquired Grupo Editorial Expansion, Mexico s second largest magazine publisher. Terms were not disclosed, but industry ... Grupo Editorial Expansion in its acquisition by Time Inc., which was announced today. AdMedia Partners ...   more details




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