electromagnetism and electromechanical energy conversion

... process of electromechanical energy conversion is reversible This means that either electric energy can be converted into mechanical energy, or mechanical energy can be converted into electric energy, ... standard RI form and total winding loss is given with the summation of losses for all individual windings Iron or core loss depends on the flux density and frequency and comprises hysteresis and ... stored mechanical energy Stored mechanical energy is the energy stored in rotating masses (kinetic energy) and it is in every aspect analogous to the energy stored under linear movement (which...

Ngày tải lên: 23/01/2014, 06:20

... coenergy, and it is defined as which may also be written as ∫ Wc = λ di (1.3-24) 18 Theory of Electromechanical Energy Conversion λ Wf λa dλ Wc ia i di Figure 1.3-5.  Stored energy and coenergy ... of electromechanical energy conversion for λ−i path B to A λ B A i Figure 1.3-8.  Graphical representation of electromechanical energy conversion for λ−i path A to B to A Electromechanical Energy ... (1A-1) where V and I are phasors, and ϕ is the phase angle between V1 and I1 (power factor angle) Solving for ϕ during the open-circuit test, we have 8 Theory of Electromechanical Energy Conversion...

Ngày tải lên: 16/02/2014, 18:45

... example The differential energy and coenergy functions can be derived as following: dW f = dWe − dWm where dWe = e1i1dt + e2 i2 dt 10 Principle of Electromechanical Energy Conversion A doubly excited ... velocities, and accelerations, and is governed by the Newton's laws The magnetic subsystem or magnetic field fits between the electrical and mechanical subsystems and acting as a "ferry" in energy ... component of the product of the emf and current Therefore, the electrical energy and the mechanical energy are interconverted via the magnetic field Concept map of electromechanical system modeling...

Ngày tải lên: 11/07/2014, 05:20

... requirements and also resulting high losses and costs The drawbacks with both these solutions have led to the development of a new conversion configuration based on active series compensation and a ... theoretical large scale system loss and rating investigations Magnetic Energy Recovery Switch (MERS) Configuration and operation The configuration of the magnetic energy recovery switch (MERS) consists ... rating 8.4 pu 10.4 pu Rating and loss considerations for large scale system The losses and ratings of a large scale electrical conversion system with MERS solution and with a 2-level active rectifier...

Ngày tải lên: 15/10/2013, 16:11

... UNITS AND CONVERSION FACTORS Conversion factors Type Name Symbol Approximate value energy energy energy energy energy energy energy energy energy energy energy energy energy energy energy energy energy ... ENERGY CONVERSION CHAPTER BASIC PRINCIPLES OF ENERGY CONVERSION A large number of energy conversion processes take place in nature Man is capable of performing a number of additional energy conversion ... general principles of energy conversion and then move on to more specific types of conversion suitable for different classes of renewable energy such as wind, hydro and wave energy, solar radiation...

Ngày tải lên: 01/04/2014, 11:38

... effect, Peliter effect and Thomas effect, involve the conversion between the thermal energy and electrical energy The thermoelectric materials play an important role in solving the energy crisis The ... both SL NWs and pure Si NWs The energy scale is relative to the conduction band edge 92 4.10 Thermal power factor versus energy in the valence band The energy scale ... 21st century Thermoelectric phenomena involve the conversion between the thermal energy and electrical energy and provide a method for heating and cooling materials Thermoelectric materials are...

Ngày tải lên: 10/09/2015, 08:24

... TITANIUM DIOXIDE NANOSTRUCTURES AND THEIR COMPOSITES WITH CARBON RICH MATERIALS FOR ENERGY CONVERSION AND STORAGE ZHU PEINING (B Eng., Huazhong University of Science and Technology) A THESIS SUBMITTED ... tip and the grounded collector is thus created and allows fibers formation 35 xv    Fig 3.1 Fig 3.2 SEM images of the as-spun PVP-TiO2 composite nanofibers (A and B) and the TiO2 nanofibers (C and ... detached from TiO2 and TiO2-CNT (0.2 wt %) electrodes Fig 4.11 Energy band diagram illustrating the charge injection and charge transport from excited sensitizer into TiO2 and to the conductive...

Ngày tải lên: 10/09/2015, 09:12

... valence and conduction band.2 TiO2, Nb2O5 and ZnO have valence band consisting in hybridized s-p orbitals and their conduction band are made of pure 3d orbitals The dissimilar parity of the two bands ... as for example energy demand is very high after sunset to provide lighting Therefore renewable energy comes with its dual topic of energy storage Energy is produced when possible and stored until ... Das, Christie, and Aravindan I especially thank Xuan and Sakunthala for their helpful discussions and their moral supports And last but not least, I would like to thank Jasmin and Sharen for...

Ngày tải lên: 16/10/2015, 11:57

... grants and contracts and 500 technical publications, Dr Rosen is an active teacher and researcher in thermodynamics, energy technology, sustainable energy and the environmental impact of energy ... requires little energy and a value of if it requires a great amount of energy For example, processes that generate energy have higher index values (primary conversion, electricity generating and hydrogen ... sludge: Process development and energy optimization Energy Conversion and Management 2008;49:2264-2271 [31] Lewis FM Generation of an ultra-superheated steam composition and gasification therewith...

Ngày tải lên: 05/09/2013, 14:58

... Nanostructuring for Efficient Energy Conversion (CNEEC) at Stanford University, an Energy Frontier Research Center funded by the U.S Department of Energy, Office of Science, Office of Basic Energy Sciences under ... lengths that are sample and potentially position dependent, (3) feature a nonuniformity in the nanoparticle size, shape, and density, and (4) could show positive catalytic effects35 and enhanced charge ... collaborations and discussions with Stacey Bent’s and Bruce Clemens’ groups and thank Jonathan Bakke for ALD work We gratefully acknowledge Wenshan Cai for help with simulations and Tom Carver...

Ngày tải lên: 18/09/2013, 21:26

... because of the losses associated with the conversion of electrical energy to mechanical shaft energy, and the conversion of mechanical shaft energy to kinetic energy or air Air FIGURE 2–48 Schematic ... forms of energy that constitute the total energy 2–5C How are heat, internal energy, and thermal energy related to each other? 2–6C What is mechanical energy? How does it differ from thermal energy? ... the organized energy is much more valuable than the disorganized energy, and a major application area of thermodynamics is the conversion of disorganized energy (heat) into organized energy (work)...

Ngày tải lên: 20/01/2014, 15:19

... process of electromechanical energy conversion is reversible This means that either electric energy can be converted into mechanical energy, or mechanical energy can be converted into electric energy, ... standard RI form and total winding loss is given with the summation of losses for all individual windings Iron or core loss depends on the flux density and frequency and comprises hysteresis and ... stored mechanical energy Stored mechanical energy is the energy stored in rotating masses (kinetic energy) and it is in every aspect analogous to the energy stored under linear movement (which...

Ngày tải lên: 23/01/2014, 06:20

... Energy Research at DOE WAS IT WORTH IT? Energy Efficiency and Fossil Energy Research 1978 to 2000 Committee on Benefits of DOE R&D on Energy Efficiency and Fossil Energy Board on Energy and ... Benefits of DOE R&D on Energy Efficiency and Fossil Energy wishes to acknowledge and thank the staffs of the Office of Energy Efficiency and Renewable Energy and the Office of Fossil Energy for their ... successes and failures of DOE’s research program would be a very frustrating and puzzling enterprise Energy Efficiency and Fossil Energy Research at DOE The two program areas energy efficiency and...

Ngày tải lên: 17/02/2014, 06:20

... 10/28/10 HOUR ENERGY EXTRA STRENGTH 10/2/10 HOUR ENERGY GRAPE CONVULSION, BITE OTHER SERIOUS (IMPORTANT MEDICAL EVENTS) 10/2/10 HOUR ENERGY BERRY FLAVOR 131933^ Page Report # Received Date Brand/ Product ... ENERGY CONVULSION OTHER SERIOUS (IMPORTANT MEDICAL EVENTS) 133099 12/2/10 5-HOUR ENERGY RENAL FAILURE OTHER SERIOUS (IMPORTANT MEDICAL EVENTS) 133162 11/18/10 HOUR ENERGY DIETARY SUPPLEMENT ENERGY ... 12/30/11 HOUR ENERGY HOSPITALIZATION HOSPITALISATION Page Report # Received Date Brand/ Product Name Symptoms Outcomes 147297 12/30/11 5-HOUR ENERGY DEATH DEATH 148558 2/6/12 HOUR ENERGY MYOCARDIAL...

Ngày tải lên: 19/02/2014, 18:20

... complex and costly It takes more energy to get energy, and to develop and run petroleum technology Deep-sea exploration rigs are among the most complex technologies that we have developed, and they ... measures up against demand and total oil use in the United States, and how big the energy profit is after so much energy is expended in exploration, drilling, recovery, refining, and transportation ... unsubstantiated claims about domestic energy supplies and promises of energy independence Thermodynamics Thermodynamics is the science of admissible conversions of energy Work, heat, and radiation are the means...

Ngày tải lên: 21/02/2014, 18:20

... in the Lagrangian , and the fact that the field xµ (τ, σ) is defined on the finite strip σ π , and −∞ < τ < ∞, which has boundaries The classical equations of the motion and the boundary conditions ... Formalism Let us suppose that the Lagrangian density L depends on the field function xµ (τ, σ) and on their first and second derivatives τ2 d2 uL(xµ , xµ,i, xµ,ij ) = S= σ2 dσL(xµ, xµ,i, xµ,ij ) dτ τ1 ... ∂L + ∂i ∂xµ,1 ∂L ∂xµ,1i , (16) Bµ (τ, σ) = ∂L + ∂i ∂xµ,1 ∂L ∂xµ,1i , (16) and the following boundary conditions where and Cµ (τ, σ) = ∂l ∂xµ,11 (17) In the case of the closed string δµ (τ, σ)...

Ngày tải lên: 05/03/2014, 14:20

... stock and conversion approach Energy and sustainability II, WIT press 2009; 35-48, DOI:10.2495/ESUS090041 [4] Schild G, Sixta H Sulfur-free dissolving pulps and their application for viscose and ... of liquid fuels (e.g., ethanol, butanol and 2,3-butanediol) and other products (e.g., acetic acid and butyric acid) Chapters and overview the production and applications of biobutanol Chapter ... al [43, 44] patented a one and two step process allowing conversion of furfural to Me-THF under a palladium-based catalyst and a mixture of palladium and copper oxide and chromium oxide as for...

Ngày tải lên: 07/03/2014, 11:20

... as extensive hands-on training to launch, place and collect the instruments and to download and process the resulting data By the end of the module, participants should understand the basics ... CEIHD and the Shell Foundation: the UCB particle monitor, the HOBO CO logger and CO diffusion tubes It explains how they work and discusses their capabilities and limitations Launching and placing ... communities and the local and global environment The presentation "How to evaluate?" gives a taste of evaluation design options and the use of quantitative versus qualitative methods, and addresses...

Ngày tải lên: 15/03/2014, 20:20

... respectively, were: -0.54 and -0.25 for rice, -0.54 and -0.35 for wheat flour, -0.09 and -0.03 for coarse grains, -0.96 and -0.33 for pork, -0.03 and -0.40 for eggs, and -0.39 and -0.47 for edible ... participants were randomized into five groups including no treatment, standard behavioural treatment (SBT), SBT and food provision, SBT and incentives and SBT, food provision and incentives The ... RCT randomized 202 men and women into five treatment groups: no treatment, standard behavioural treatment (SBT), SBT plus food provision, SBT plus incentives, and SBT plus food provision and incentives...

Ngày tải lên: 17/03/2014, 08:20

... stock and conversion approach Energy and sustainability II, WIT press 2009; 35-48, DOI:10.2495/ESUS090041 [4] Schild G, Sixta H Sulfur-free dissolving pulps and their application for viscose and ... of liquid fuels (e.g., ethanol, butanol and 2,3-butanediol) and other products (e.g., acetic acid and butyric acid) Chapters and overview the production and applications of biobutanol Chapter ... al [43, 44] patented a one and two step process allowing conversion of furfural to Me-THF under a palladium-based catalyst and a mixture of palladium and copper oxide and chromium oxide as for...

Ngày tải lên: 23/03/2014, 17:20