The optical optics term encircledenergy refers to a measure of concentration of energy in an optical image , or projected laser beam laser at a given range. If a single star is brought to its sharpest Focus optics focus by a lens optics lens giving the smallest image possible with that given lens called a point spread function or PSF , calculation of the encircledenergy of the resulting image gives the distribution of energy in that PSF. Encircledenergy is calculated by first determining the total energy of the PSF over the full image plane, then determining the centroid of the PSF. Circles of increasing radius are then created at that centroid and the PSF energy within each circle is calculated and divided by the total energy. As the circle increases in radius, more of the PSF energy is enclosed, until the circle is sufficiently large to completely contain all the PSF energy. The encircledenergy curve thus ranges from zero to one. A typical criterion for encircledenergy EE is the radius of the PSF at which either 50 or 80 of the energy is encircled. This is a linear dimension, typically in micrometre micrometer s. When divided by the lens or mirror focal length, this gives the angular size of the PSF, typically expressed in Minute of arc arc seconds when specifying astronomical optical system performance. Encircledenergy is also used to quantify the spreading of a laser beam at a given distance. All laser beams spread due to the necessarily limited aperture of the optical system projecting the beam. As in star image PSF s, the linear spreading of the beam expressed as encircledenergy is divided by the projection distance to give the angular spreading. An alternative to encircledenergy is ensquared energy, typically used when quantifying image sharpness for digital ... Geometrical optics Category Physical optics Category Engineering concepts Category Optics de EncircledEnergy ... more details
Energy management is the control of energy, may refer to Energy demand management Energy management degree Energy management system Federal Energy Management Program Power management by electrical devices Management of energy in a particular context Hotel energy management IT energy management Marine energy management disambig ... more details
saved book title Energy subtitle cover image cover color Energy Main article Energy History History of energy Timeline of thermodynamics Regarding applications of the concept of energy Mechanics Work physics Mechanical work Thermodynamics Quantum mechanics Measurement Units of energy Forms of energy Potential energy Gravitational energy Elastic energy Kinetic energy Internal energy Electromagnetism Electricity Chemical thermodynamics Binding energy Transformations of energyEnergy transformation Law of conservation of energy Conservation of energyEnergy and life Bioenergetics Category Wikipedia books on energyEnergy ... more details
Wikibooks How to reduce energy usage Energy consumption is the consumption of energy or Power physics power . It is covered in the following articles and categories World energy consumption Domestic energy consumption Fuel efficiency in transportation Electric energy consumption Electricity generation Energy transformation Energy policy Effects of energy consumption Global warming White s law Reduction of energy consumption Energy conservation , the practice of decreasing the quantity of energy used Efficient energy use DEFAULTSORT Energy Consumption Category Energy consumption de Energieverbrauch ... more details
TOC right In physics , energy economics and energetics ecological energetics , energy returned on energy invested EROEI or ERoEI or energy return on investment EROI , is the ratio of the amount of usable energy acquired from a particular energy resource to the amount of energy expended to obtain that energy resource. ref name mh2010 cite journal title Year in review EROI or energy return on energy ... cite web url http www.eoearth.org article Energy return on investment EROI title Energy return on investment ... 2011 09 02 ref When the EROEI of a resource is less than or equal to one, that energy source becomes an energy sink , and can no longer be used as a primary energy primary source of energy. math EROEI frac hbox Usable Acquired Energy hbox Energy Expended math Non manmade energy inputs The natural or original sources of energy are not usually included in the calculation of energy invested, only ... is not included, and the energy used in the stellar synthesis of fissile elements is not included for nuclear fission . The energy returned includes usable energy and not wastes such as heat. Because much of the energy required for producing oil from oil sands oil or tar sands bitumen comes ..., the higher value given by considering only the external energy inputs and the lower by considering all energy inputs, including self generated. See Oil sands Input energy Relationship to net energy gain EROEI and Net energy gain Net energy gain measure the Energy quality same quality of an energy source or sink in numerically different ways. Net energy describes the amounts, while EROEI measures ... given a process with an EROEI of 5, expending 1 unit of energy yields a net energy gain of 4 units. The break even point happens with an EROEI of 1 or a net energy gain of 0. The economic influence of EROEI File EROI Ratio of Energy Returned on Energy Invested USA.svg thumb 450px EROI Ratio of Energy Returned on Energy Invested, Murphy & Hall 2010 Ann NY Acad Sci 1185 102 118. High per capita ... more details
The following articles relate to the topic of energy independence Portal EnergyEnergy development Energy resilience Energy resilience Energy security North American energy independence Oil phase out in Sweden Commission on Oil Independence Swedish Commission on Oil Independence United States energy independence Disambig ... more details
Energy use or similar terms are discussed in the following articles Efficient energy use World energy resources and consumption energy use intensity disamb ... more details
MidAmerican Energy may refer to one of the following MidAmerican Energy Holdings Company , a holding company controlled by Berkshire Hathaway MidAmerican Energy Company , an energy company and subsidiary of MidAmerican Energy Holdings Company disambig ... more details
The term Department of Energy is used by government departments in a number of countries and may refer to Secretariat of Energy Mexico Department of Energy Philippines United States Department of Energy United Kingdom Department of Energy abolished 1994 Department of Energy New Brunswick , Canada United States Department of Energy disambig fr D partement de l nergie ... more details
Energy efficiency may refer to Efficient energy use , sometimes simply called energy efficiency. Energy conversion efficiency , the ratio between the output and input of an energy conversion machine. Energy conservation , efforts made to reduce energy consumption. Disambig ... more details
Energy rating may refer to Energy rating label , an appliance energy efficiency rating used in Australia and New Zealand Building energy rating Energy efficiency rating , a score applied to dwellings in the Australian Capital Territory House Energy Rating , a building s thermal performance for residential homes in Australia Home energy rating , a measurement of a home s energy efficiency, used primarily in the United States National Home Energy Rating , an accreditation scheme for energy assessors and a rating scale for the energy efficiency of housing in the United Kingdom See also Energy Star , an international standard for energy efficient consumer products originated in the United States Energy input labeling Ecolabel dab ... more details
New energy may refer to new or Free energy suppression suppressed forms of energy like alternative energy , Perpetual motion free energy , renewable energy , etc. Companies Institutes Organizations Icelandic New Energy , Iceland energy company promoting hydrogen fuel Institute of Nuclear and New Energy Technology , China New Energy and Industrial Technology Development Organization NEDO disamb ... more details
High energy may refer to High energy physics , a branch of physics dealing with subatomic particles and ionizing radiation Hi NRG , a kind of dance music High Energy The Supremes album High Energy The Supremes album , 1976 High Energy The Supremes song High Energy The Supremes song , 1976 High Energy Freddie Hubbard album High Energy Freddie Hubbard album , 1974 High Energy Evelyn Thomas song High Energy Evelyn Thomas song , 1984 High Energy, a 1990 s professional wrestling tag team consisting of Owen Hart and Koko B. Ware High Energy and departure 1992 1994 Koko B. Ware Disambiguation it High Energy ... more details
wiktionary energyEnergy is a physical quantity that describes the amount of work that can be performed by a force. Energy may also refer to Music Energy, an american rock band, featuring Tommy Bolin Energy band , a Taiwanese boy group Energy event , an annual techno music event in Zurich, Switzerland Energy Fourplay album Energy Fourplay album , 2008 Energy Keri Hilson song Energy Keri Hilson song , 2009 Energy Nu a Derenda song Energy Nu a Derenda song , entry in the 2001 Eurovision Song Contest Energy Operation Ivy album Energy Operation Ivy album , 1989 Energy Pointer Sisters album Energy Pointer Sisters album , 1978 Energy Rekords , a record label Energy , a song by Krokus from Krokus album Krokus Energy , a song by The Pillows from Pantomime album Pantomime Energy , a song by The Apples in Stereo from New Magnetic Wonder Energy , a song in the LazyTown soundtrack LazyTown soundtrack Science and philosophy Energy esotericism , spiritual energyEnergy psychological , the principle that powers mental processes Energy signal processing , the energy Es of a continuous time signal x t Energy Micro AS , a manufacturer low energy 32 bit Flash microcontrollers MCU Energeia , the general ... in Eastern Orthodox theology V rya , energy as part of the Buddhist path to Enlightenment Energy, a concept in vitalism Energy, a game mechanic commonly referred to as Magic point Radio stations Energy FM 91.5 Philippines , DWKY Energy 92.5 and 92.7 Dekalb, Illinois , now WCPY Energy 92.5 and 92.7 Arlington Heights, Chicago, Illinois , now WCPT FM Energy 92.5 and 92.7 Kankakee, Illinois , now WKIF Energy 92.7 San Francisco, California , now KREV FM Energy 92.7 and 101.1 Phoenix, Arizona , now KNRJ Energy 99.7 Amarillo, Texas , now KBZD NRJ Radio , Paris, France Other uses Energy, Illinois , a village in the USA Energy, Texas , a settlement in the USA Iowa Energy , a team in the NBA Development League See also Outline of energy Energia disambiguation Energy and society , energy resources ... more details
Energy FM is the brand name of several radio station s Energy FM Estonia Energy FM Isle of Man Energy FM Malta DWET FM Energy FM Manila Energy FM Taranaki Energy FM Australia Energy FM UK NRJ Russia , also known as Energy FM It may also refer to the nergie radio network in Quebec . Disambig ... more details
Zero energy may refer to A zero energy building ZEB , a building s use with zero net energy consumption and zero carbon emissions Zero Net Energy USA Federal Buildings President Obama has ordered that 15 of U.S. Federal buildings be zero net energy by 2015 and 100 of all new buildings by 2030 Zero energy universe , a concept that states that the total amount of energy in the Universe is exactly zero Zero point energy , the lowest possible energy that a quantum mechanical physical system may have dab ... more details
Energy flow is the transfer of energy and may refer to Energy flow ecology , the flow of energy through a biological food chain Energy esotericism flow, the movement of spiritual energy. Energy transfer , the transfer of physical energy from one body to another or from one place to another. BTTB album Energy Flow , a 1999 song by Ryuichi Sakamoto disambig ... more details
Energy balance may refer to First law of thermodynamics , according to which energy cannot be created or destroyed, only modified in form Energy balance biology , a measurement of the biological homeostasis of energy in living systems Energy economics , where the energy balance of a country is an aggregate presentation of all human activities related to energy, except for natural and biological processes Groundwater energy balance , comparing a groundwater body in terms of incoming hydraulic energy associated with groundwater inflow and outflow Energy returned on energy invested EROEI , ratio of the amount of usable energy acquired from a particular energy resource to the amount of energy expended to obtain that energy resource Energy accounting , a system used within industry, where measuring and analyzing the energy consumption of different activities is done to improve energy efficiency Energy Economics journal Energy Economics journal , a scientific journal published by Elsevier under its North Holland imprint disambig DEFAULTSORT Energy Balance Category Energy economics Category Chemical engineering de Energiebilanz Umwelt et Energiabilanss id Neraca energi hu Energiam rleg pl Bilans energetyczny ... more details
An energy minister is a position in many government s responsible for energy production and regulation, developing governmental energy policy, scientific research, and natural resources conservation ethic conservation . In some countries, environmental responsibilities are given to a separate environment minister . Country related articles and lists AUS Minister for Resources and Energy Australia Minister for Resources and Energy BEL Ministry of Energy Belgium Ministry of Energy BRA Ministry of Mines and Energy Brazil Ministry of Mines and Energy CAN Minister of Natural Resources Canada Minister of Natural Resources DEN Minister of Climate and Energy Denmark Minister of Climate and Energy flag European Union European Commissioner for Energy GRE Minister for the Environment, Energy and Climate Change HKG Secretary for the Environment IDN Minister of Energy and Mineral Resources Indonesia Minister of Energy and Mineral Resources IRL Minister for Communications, Energy and Natural Resources Ireland Minister for Communications, Energy and Natural Resources flagicon Manitoba Manitoba Minister of Science, Energy, Technology and Mines Manitoba Minister of Science, Energy, Technology and Mines flagicon New Zealand New Zealand Ministry of Economic Development PER Ministry of Energy and Mines Peru Ministry of Energy and Mines PHL Department of Energy Philippines Secretary of Energy ZAF Minister of Energy South Africa Minister of Energy SWE Minister for Enterprise and Energy Sweden Minister for Enterprise and Energy GBR Secretary of State for Energy and Climate Change SCO Minister for Enterprise, Energy and Tourism USA United States Secretary of Energy Secretary of Energy VIE Ministry of Natural Resources and Environment Vietnam See also Ministry of Mines and Energy Types of government minister DEFAULTSORT Energy Minister Category Government ministers by portfolio Category Energy ministers gov job stub ar de Energieministerium sv Energiminister ... more details
Unlimited energy may refer to Perpetual motion , a device or system that delivers more energy than was put into it Sustainable energy , the provision of energy such that it meets the needs of the present without compromising the ability of future generations to meet their needs Renewable energy , energy that uses natural resources that may be naturally replenished See also Free energy suppression , a conspiracy theory that says that technology that could produce unlimited energy is being suppressed by special interest groups Disambig ... more details
Wild Energy may refer to Wild Energy album Wild Energy album , an album by Ruslana Wild Energy song Wild Energy song or Dyka Enerhiya , a song by Ruslana Wild Energy. Lana , a novel by Maryna and Serhiy Dyachenko See also Wild Energy. Amazon. Wild Dances , a DVD compilation by Ruslana disambig cs Wild Energy ... more details
Infinite energy may refer to Infinite Energy magazine Infinite Energy magazine , a bi monthly alternative energy magazine Perpetual motion , a device or system that delivers more energy than was put into it Anant Virya infinite energy or perfect power , a characteristic of the soul in Jainism See also Free energy suppression , a conspiracy theory that says that technology that could produce unlimited energy is being suppressed by special interest groups disamb ... more details
Grey energy can mean Energy produced from fossil fuels. This usage appears in conjunction with the http www.ieawind.org iea wind pdf PDF 2000 IEA Annual Report NetherB.pdf Regulating Energy Tax in the Netherlands . Embodied energy , the total energy used to make something. disambig ... more details
USS Energy is a name used more than once by the U.S. Navy USS Energy AMc 78 , a coastal minesweeper commissioned 1 January 1942. USS Energy AM 436 , a fleet minesweeper commissioned 16 July 1954. Shipindex DEFAULTSORT Energy Category United States Navy ship names pl USS Energy ... more details
Energy accounting is a system used within industry, where measuring and analyzing the energy consumption Disambiguation needed date June 2011 of different activities is done to improve Efficient energy use energy efficiency . ref http books.google.se books?id ucOUmIgQ5sQC&pg PA1&lpg PA1&dq Energy Accounting&source ... X&oi book result&resnum 3&ct result PPA1,M1 Accounting Facility Energy Use in Encyclopedia of Energy Engineering and Technology ref Energy management Image Hot metalwork.jpg right thumb Heat , a form of energy, is the amount of random molecular kinetic energy . Energy accounting is a system used in energy management system s where measuring and analyzing energy consumption is done to improve energy ... Energy Accounting&source bl&ots KeN49O abq&sig slaka fe6D1DJM RQO9h2FqS9Tk&hl sv&ei WSK1Se 4Oo O ganx TLBA&sa X&oi book result&resnum 3&ct result PPA1,M1 Accounting Facility Energy Use in Encyclopedia of Energy Engineering and Technology ref Various energy transformation s are possible. An energy balance can be used to track energy through a system. This becomes a useful tool for determining resource use and environmental impacts. How much energy is needed at each point in a system and in what form that energy is , can be measured. An accounting system keeps track of energy in, energy out, and non useful energy versus work done, and transformations within a system. Sometimes, non useful work ... s3 05account.shtml ref Energy balance Energy return on investment EROEI is the ratio of energy delivered by an energy technology to the energy invested to set the technology up. See also Energy management software Energy management system Energy transformation Energy quality Energy and Environment EROEI ... Energy Accounting&source bl&ots KeN49O abq&sig slaka fe6D1DJM RQO9h2FqS9Tk&hl sv&ei WSK1Se 4Oo O ganx TLBA&sa X&oi book result&resnum 3&ct result PPA1,M1 Accounting Facility Energy Use DEFAULTSORT Energy Accounting Category Thermodynamics Category Energy economics ... more details
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