connection and the y connection
synchronous generators chuong (1)
Ngày tải lên :
21/03/2014, 12:12
... availability, energy density, the efficiency of the energy conversion to thermal to mechanical to electrical energy, and their secondary ecological effects (limitations) 1.2 Major Energy Sources With the ... standards are necessary to provide quality power in terms of continuity, voltage and frequency constancy, phase symmetry, faults treatment, and so forth The thoughts of the bigger the unit, the ... gas and oil and nuclear fuel to geothermal energy inside the earth Usually, their efficiency reaches 40%, but in a combined cycle (producing heat and mechanical power), their efficiency recently...
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Integration of energy and environmental systems in wastewater treatment plants
Ngày tải lên :
05/09/2013, 15:28
... generated by taking the ratio of a facility’s actual energy intensity and comparing it to the energy intensity predicted by the Energy Star model A multivariate regression analysis is then conducted ... collected and then the energy consumed by each process was estimated based on the specifications of equipment of the facility and the run time There are mainly three processes that consume energy in the ... that the clarifier reduces the BOD level by 10%, pump and trickling filter by 25%, and rest of the 65% by blower and oxidation ditch The clarifier initially separates the suspended solids and...
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Energy and exergy analysis of particle dispersed latent heat storage system
Ngày tải lên :
05/09/2013, 16:10
... pointed out that thermal analysis of LHTS systems based on only first law of thermodynamics (energy analysis) may not produce a system with highest possible thermodynamic efficiency although workable ... is the temperature of the HTF at the outlet (K) The present system studied is assumed as an adiabatic and hence, the heat transferred by the HTF is completely stored in the PCM As a result, the ... efficiency of the system becomes unity all the time Hence, the calculation of energy efficiency does not indicate the true performance of the system This shortcoming can be overcome, if exergy efficiency...
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Tài liệu tiếng anh Điện tử công suất mạch MERS A new AC current switch called MERS with low on state voltage IGBTs for renewable energy and power saving applications
Ngày tải lên :
15/10/2013, 16:10
... any compensation, the output voltage will drop and the power output is limited (Fig 10(b) On the other hand, the MERS can cancel the voltage drop across the synchronous reactance and control the ... indicated The not-continuous and the dc-offset mode results by turning two and two switches on/off in pairs while the active bypass mode results when actively by-passing the capacitor for a part of the ... even with varying frequency Another important feature is the simplicity of the control When operated in dcoffset mode can a phase shift of the gate signals directly control the phase of the current...
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Bài giảng Chapter 17 Free Energy and Thermodynamics
Ngày tải lên :
28/11/2013, 01:12
... • The two factors that determine the thermodynamic favorability are the enthalpy and the entropy • The enthalpy is a comparison of the bond energy of the reactants to the products bond energy ... require energy input to go • spontaneity is determined by comparing the free energy of the system before the reaction with the free energy of the system after reaction if the system after reaction ... Energy, G ΔSuniverse= ΔSsurroundings+ ΔSsystem = - ΔHsystem / T + ΔSsystem -TΔSuniverse = ΔHsystem - T ΔSsystem = ΔGsystem ΔG is the change in free energy for the system ΔGosystem = ΔHosystem...
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Tài liệu Chapter 7: Kinetic Energy and Work docx
Ngày tải lên :
13/12/2013, 05:15
... from the object If energy it transferred to m (its K increases) we say that work was done by F on the object (W > 0) If on the other hand If on the other hand energy its transferred from the object ... A and B have coordinates ( xi , yi , zi ) and ( x f , y f , z f ) , respectively r r dW = F ×dr = Fx dx + Fy dy + Fz dz B W = ∫ dW = A xf yf ∫ F dx + ∫ F dy + ∫ F dz x xi y z yi xf W= zf zi yf ... F on our hand in the opposite direction The force F exerted by the spring on whatever agent (in the picture our hand) is trying to change its natural length either by extending or by compressing...
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Tài liệu Chapter 8: Potential Energy and Conservation of Energy doc
Ngày tải lên :
23/12/2013, 00:16
... external to the system The system under study is a bowling ball being hurled by a player The system consists of the ball and the earth taken together The force exerted on the ball by the player is ... energy of the particle-earth system We use the result of the previous section to calculate ∆U yf ∆U = − ∫ F ( x )dy yi yf yf yi yi F = −mg → ∆U = − ∫ ( − mg ) dy = mg ∫ dy = mg [ y ] y yf i ∆U ... ∆U = mg ( y f − yi ) = mg y We assign the final point y f to be the "generic" point y on the y -axis whose potential is U ( y ) → U ( y ) − U i = mg ( y − yi ) Since only changes in the potential...
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Tài liệu Compilers and Compiler Generators an introduction with C++ pptx
Ngày tải lên :
26/01/2014, 07:20
... to another" being the typical order of complexity Some of these instructions may be completely defined by a single byte value Others may need two or more bytes for a complete definition Of these ... from memory (along the data bus), place it in the IR, and then execute the operation which this byte represents Multi-byte instructions may require the fetching of further bytes before the instruction ... intangible ways by their reaction to my courses The development of the software in this book relied heavily on the use of electronic mail, and I am grateful to Randy Bush, compiler writer and network...
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Tài liệu Báo cáo " DETERMINING FLOW ENERGY AND EROSION COEFFICIENT FOR CLASSIFICATION OF POTENTIAL EROSION IN BINH DINH PROVINCE " ppt
Ngày tải lên :
13/02/2014, 12:20
... numerical value of the flow energy Y and the erodability factor K in the following formula: M = K Y , (1) The erodability factor K is determined by the quantity of grain force M* defined by the following ... characteristics and to take advantage in the future research, we grouped the profiles of each soil types, and then put soil types into groups, and finally arranged these groups according to their erosive ... erosion potential mainly distributes on the convertible land, the upstream protection land, and the production forest land However, we have only researched and categorized the erosion potential...
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Tài liệu Báo cáo khoa học: Quantitative analysis of the experimental O–J–I–P chlorophyll fluorescence induction kinetics Apparent activation energy and origin of each kinetic step Steve Boisvert, David Joly and Robert Carpentier doc
Ngày tải lên :
19/02/2014, 05:20
... the amplitudes and rate constants of the two other phases The above should be governed by the balance between the rate of reduction and oxidation of the acceptor side of PSII by the available ... modeled by the superposition of the exponential rise to analyze quantitatively the contribution of each phase The amplitude and rate constant of each of the three phases can be calculated by deconvolution ... demonstrating that the JI rise is not directly related to the reduction of the PQ pool A further analysis of the inuence of PQ reduction on FI was performed after the addition of dPQ to the thylakoid samples...
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Tài liệu CFSAN Adverse Event Reporting System Voluntary and Mandatory Reports on 5-Hour Energy, Monster Energy, and Rockstar Energy Drink pptx
Ngày tải lên :
19/02/2014, 18:20
... accuracy Furthermore, in many reports, individuals may have used other products, and many products contain multiple ingredients which further complicates the evaluation of adverse event reports There ... accuracy Furthermore, in many reports, individuals may have used other products, and many products contain multiple ingredients which further complicates the evaluation of adverse event reports There ... accuracy Furthermore, in many reports, individuals may have used other products, and many products contain multiple ingredients which further complicates the evaluation of adverse event reports There...
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Tài liệu Plant physiology - Chapter 2 Energy and Enzymes docx
Ngày tải lên :
20/02/2014, 01:20
... enzymatic activity and obtain very carefully controlled expression of catalysis The amount of enzyme in a cell is determined by the relative rates of synthesis and degradation of the enzyme The ... Instead, it may bind to another site on the protein and obstruct the substrate’s access to the active site, thereby changing the catalytic properties of the enzyme, or it may bind to the enzyme– substrate ... by the same physical laws of energy flow that apply everywhere in the universe These laws of energy flow have been encapsulated in the laws of thermodynamics Energy is defined as the capacity...
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Tài liệu Coenzym Q10 cung cấp năng ượng và bảo vệ chống oxy hoá (Coenzyme Q10 provides energy and antioxidant protection) potx
Ngày tải lên :
26/02/2014, 03:20
... sung huyết đợc cải thiện uống Co Q10 Nếu uống 100mg/ng y, 30 ng y th y cải thiện rõ rệt chức tim, kể ngời đáp ứng với glycosid trợ tim thuốc lợi niệu Một công trình ý, th y 1.113 ngời suy tim ... tim, th y giảm huyết áp, cải thiện chức tâm trơng, giảm 53% độ d y thành tim, cải thiện phân suất tống máu (EF) cung lợng tim Thờng dùng Co Q10 suy tim sung huyêt, đau thắt ngực, tăng huyết áp, ... phẫu thuật g y tổn hại oxy hoá nội mạc tim, mổ tim làm hao hụt lợng Co Q10 sẵn có Một nghiên cứu mù kép, so sánh placebo ngời bệnh tim uống 120mg Co Q10/ ng y, trong 28 ng y, th y: Biểu Placebo...
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THE ARTS CHILD POLICY CIVIL JUSTICE EDUCATION ENERGY AND ENVIRONMENT HEALTH AND HEALTH CARE docx
Ngày tải lên :
06/03/2014, 09:21
... Commands, the Navy, the Marine Corps, the defense agencies, and the defense Intelligence Community For more information on RAND’s International Security and Defense Policy Center, contact the ... lists the insurgencies, the dates they spanned, and their outcomes The remainder of this chapter presents brief summaries of the historical cases They are presented by start date Analyses of the ... momentum early in the conflict by catching the Sandinistas by surprise After regrouping and improving intelligence collection during the second phase of the insurgency, the Sandinistas regained the upper...
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IMPLEMENTING THE NEW BIOLOGY Decadal Challenges Linking Food, Energy, and the Environment pptx
Ngày tải lên :
06/03/2014, 19:20
... scientific and engineering research, dedicated to the furtherance of science and technology and to their use for the general welfare Upon the authority of the charter granted to it by the Congress ... instability, and political and social upheavals related to struggles over scarce resources Increasing demand for food and energy is projected at the same time as the supply of land and other resources ... IMPLEMENTING THE NEW BIOLOGY BOX 1-1 A New Biology for the 21st Century A New Biology for the 21st Century is the expert consensus report authored by a committee organized by the Board on Life...
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Integrating U.S. Climate, Energy, and Transportation Policies potx
Ngày tải lên :
06/03/2014, 21:20
... installed and financed over time through a special assessment levied by the city, rather than to be paid up-front by the owner The homeowner pays off the costs gradually over time, and, if the house ... and local regulations On the other hand, states that want to go beyond federal standards have argued that they would like to be allowed to innovate and that relying exclusively on federal standards ... while the energy savings can be small and spread over many years, and, for many businesses, energy costs are not a major determinant of their overall costs Another key obstacle is that existing land-use...
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Hydrogen Energy and Fuel Cells docx
Ngày tải lên :
07/03/2014, 17:20
... the period 2000-2030 for primary and energy conversion, and the impact on energy equipment energy worldwide The increased demand is being met largely manufacturers and the end-users of energy ... practice in industry, where it hydrogen energy system is fully proven and fully introduced, works safely and provides the service required Also, hydrogen many regional demonstration and pilot projects ... social and physical welfare all depend on the sufficient, uninterrupted supply of energy Yet we take it for granted – and energy demand continues to grow, year after year Traditional fossil energy...
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The art child policy civil justice education energy and enviriment health and health cara international affair potx
Ngày tải lên :
07/03/2014, 19:20
... Program The research is sponsored by the Principal Deputy, Office of the Assistant Secretary of the Air Force (Acquisition), and by the Office of the Technical Director, Air Force Cost Analysis ... evaluates the history of the F/A-22 and F/A-18 E/F programs to understand how costs and schedules changed during their development The study derives lessons that the Air Force and other services ... techniques for the nonrecurring and recurring flyaway costs of military airframes and engines This study extends the analysis into what are termed “below -the- line” costs.1 Below -the- line costs...
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