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Letteratura scientifica selezionata sul tema "Maximum power"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 30 gennaio 2023

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Articoli di riviste sul tema "Maximum power"

1

Francisco Coelho, Roberto, Walbermark Marques dos Santos e Denizar Cruz Martins. "INFLUENCE OF POWER CONVERTERS ON PV MAXIMUM POWER POINT TRACKING EFFICIENCY". Eletrônica de Potência 19, n. 1 (1 febbraio 2014): 73–80. http://dx.doi.org/10.18618/rep.2014.1.073080.

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2

Magagula, Sibonelo G. "Power Efficiency Optimization of Switched Reluctance Generator (SRG) Using Power Disturbance Maximum Power Point Tracking (MPPT)". International Journal of Computer and Electrical Engineering 9, n. 2 (2017): 445–54. http://dx.doi.org/10.17706/ijcee.2017.9.2.445-454.

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3

Enrique, Juan Manuel, José Manuel Andújar, Eladio Durán e Miguel Angel Martínez. "Maximum power point tracker based on maximum power point resistance modeling". Progress in Photovoltaics: Research and Applications 23, n. 12 (21 maggio 2015): 1940–55. http://dx.doi.org/10.1002/pip.2620.

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4

Youssef, Ayman, Mohamed El Telbany e Abdelhalim Zekry. "Reinforcement Learning for Online Maximum Power Point Tracking Control". Journal of Clean Energy Technologies 4, n. 4 (2015): 245–48. http://dx.doi.org/10.7763/jocet.2016.v4.290.

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5

Drir, N., L. Barazane e M. Loudini. "Evaluation of Maximum Power Point Controllers in Photovoltaic System". International Journal of Environmental Science and Development 6, n. 4 (2015): 336–40. http://dx.doi.org/10.7763/ijesd.2015.v6.614.

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6

Phong, Le Tien, Nguyen Minh Cuong, Thai Quang Vinh e Ngo Duc Minh. "Method to Harness Maximum Power from Photovoltaic Power Generation Basing on Completely Mathematical Model". International Journal of Research and Engineering 5, n. 8 (settembre 2018): 486–93. http://dx.doi.org/10.21276/ijre.2018.5.8.4.

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7

Ramkumar, P. V., R. S. Mishra e Aman Khurana. "Variation in Maximum Power and Maximum Power point with different parameter analysis". INTERNATIONAL JOURNAL OF ADVANCED PRODUCTION AND INDUSTRIAL ENGINEERING 3, n. 1 (25 gennaio 2018): 33–35. http://dx.doi.org/10.35121/ijapie201801128.

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Abstract (sommario):

Variation in Maximum power and Maximum power point i.e. voltage at which Maximum Power is observed with different parameters are studied. Parameters are insolation, temperature, series resistance, shunt resistance, and reverse saturation current of the diode. For this I-V and P-V characteristics with a variation of these parameters are analyzed. For finding out the Maximum PowerPoint, Perturb & Observe technique is used. Variation in these points is different with each parameter. All simulation work is done in MATLAB.

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Kuperman, Alon, Moshe Averbukh e Simon Lineykin. "Maximum power point matching versus maximum power point tracking for solar generators". Renewable and Sustainable Energy Reviews 19 (marzo 2013): 11–17. http://dx.doi.org/10.1016/j.rser.2012.11.012.

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THOMAS, GWENDOLYN A., WILLIAM J. KRAEMER, BARRY A. SPIERING, JEFF S. VOLEK, JEFFREY M. ANDERSON e CARL M. MARESH. "MAXIMAL POWER AT DIFFERENT PERCENTAGES OF ONE REPETITION MAXIMUM". Journal of Strength and Conditioning Research 21, n. 2 (maggio 2007): 336–42. http://dx.doi.org/10.1519/00124278-200705000-00008.

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Hmurcik, L. V., e J. P. Micinilio. "Contrasts between maximum power transfer and maximum efficiency". Physics Teacher 24, n. 8 (novembre 1986): 492–93. http://dx.doi.org/10.1119/1.2342101.

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Tesi sul tema "Maximum power"

1

Martin, James Charles. "Maximum neuromuscular power across the lifespan /". Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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2

Cai, Tingting. "The maximum power principle an empirical investigation /". [Gainesville, Fla.] : University of Florida, 2002. http://purl.fcla.edu/fcla/etd/UFE1000112.

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Thesis (Ph. D.)--University of Florida, 2002.
Title from title page of source document. Document formatted into pages; contains vii, 175 p.; also contains graphics. Includes vita. Includes bibliographical references.

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3

Acharya, Parash. "Small Scale Maximum Power Point Tracking Power Converter for Developing Country Application". Thesis, University of Canterbury. Electrical and Computer Engineering, 2013. http://hdl.handle.net/10092/8608.

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This thesis begins with providing a basic introduction of electricity requirements for small developing country communities serviced by small scale generating units (focussing mainly on small wind turbine, small Photo Voltaic system and Micro-Hydro Power Plants). Scenarios of these small scale units around the world are presented. Companies manufacturing different size wind turbines are surveyed in order to propose a design that suits the most abundantly available and affordable turbines. Different Maximum Power Point Tracking (MPPT) algorithms normally employed for these small scale generating units are listed along with their working principles. Most of these algorithms for MPPT do not require any mechanical sensors in order to sense the control parameters like wind speed and rotor speed (for small wind turbines), temperature and irradiation (for PV systems), and water flow and water head (for Micro-Hydro). Models for all three of these systems were developed in order to generate Maximum Power Point (MPP) curves. Similarly, a model for Permanent Magnet Synchronous Generators (PMSGs) has been developed in the d-q reference frame. A boost rectifier which enables active Power Factor Correction (PFC) and has a DC regulated output voltage is proposed before implementing a MPPT algorithm. The proposed boost rectifier works on the principle of Direct Power Control Space Vector Modulation (DPC-SVM) which is based on instantaneous active and reactive power control loops. In this technique, the switching states are determined according to the errors between commanded and estimated values of active and reactive powers. The PMSG and Wind Turbine behaviour are simulated at various wind speeds. Similarly, simulation of the proposed PFC boost rectifier is performed in matlab/simulink. The output of these models are observed for the variable wind speeds which identifies PFC and boosted constant DC output voltage is obtained. A buck converter that employs the MPPT algorithm is proposed and modeled. The model of a complete system that consists of a variable speed small wind turbine, PMSG, DPC-SVM boost rectifier, and buck converter implementing MPPT algorithm is developed. The proposed MPPT algorithm is based upon the principle of adjusting the duty ratio of the buck converter in order reach the MPP for different wind speeds (for small wind turbines) and different water flow rates (Micro-Hydro). Finally, a prototype DPC-SVM boost rectifier and buck converter was designed and built for a turbine with an output power ranging from 50 W-1 kW. Inductors for the boost rectifier and buck DC-DC converter were designed and built for these output power ranges. A microcontroller was programmed in order to generate three switching signals for the PFC boost rectifier and one switching signal for the MPPT buck converter. Three phase voltages and currents were sensed to determine active and reactive power. The voltage vectors were divided into 12 sectors and a switching algorithm based on the DPC-SVM boost rectifier model was implemented in order to minimize the errors between commanded and estimated values of active and reactive power. The system was designed for charging 48 V battery bank. The generator three phase voltage is boosted to a constant 80 V DC. Simulation results of the DPC-SVM based rectifier shows that the output power could be varied by varying the DC load maintaining UPF and constant boosted DC voltage. A buck DC-DC converter is proposed after the boost rectifier stage in order to charge the 48 V battery bank. Duty ratio of the buck converter is varied for varying the output power in order to reach the MPP. The controller prototype was designed and developed. A laboratory setup connecting 4 kW induction motor (behaving as a wind turbine) with 1kW PMSG was built. Speed-torque characteristic of the induction motor is initially determined. The torque out of the motor varies with the motor speed at various motor supply voltages. At a particular supply voltage, the motor torque reaches peak power at a certain turbine speed. Hence, the control algorithm is tested to reach this power point. Although the prototype of the entire system was built, complete results were not obtained due to various time constraints. Results from the boost rectifier showed that the appropriate switching were performed according to the digitized signals of the active and reactive power errors for different voltage sectors. Simulation results showed that for various wind speed, a constant DC voltage of 80 V DC is achieved along with UPF. MPPT control algorithm was tested for induction motor and PMSG combination. Results showed that the MPPT could be achieved by varying the buck converter duty ratio with UPF achieved at various wind speeds.

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Mena, Hugo Eduardo. "Maximum power tracking control scheme for wind generator systems". Thesis, [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-2063.

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Gamboa, Gustavo. "REALIZATION OF POWER FACTOR CORRECTION AND MAXIMUM POWER POINT TRACKING FOR LOW POWER WIND TURBINES". Master's thesis, University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4283.

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In recent years, wind energy technology has become one of the top areas of interest for energy harvesting in the power electronics world. This interest has especially peaked recently due to the increasing demand for a reliable source of renewable energy. In a recent study, the American Wind Energy Association (AWEA) ranked the U.S as the leading competitor in wind energy harvesting followed by Germany and Spain. Although the United States is the leading competitor in this area, no one has been able successfully develop an efficient, low-cost AC/DC convertor for low power turbines to be used by the average American consumer. There has been very little research in low power AC/DC converters for low to medium power wind energy turbines for battery charging applications. Due to the low power coefficient of wind turbines, power converters are required to transfer the maximum available power at the highest efficiency. Power factor correction (PFC) and maximum power point tracking (MPPT) algorithms have been proposed for high power wind turbines. These turbines are out of the price range of what a common household can afford. They also occupy a large amount of space, which is not practical for use in one's home. A low cost AC/DC converter with efficient power transfer is needed in order to promote the use of cheaper low power wind turbines. Only MPPT is implemented in most of these low power wind turbine power converters. The concept of power factor correction with MPPT has not been completely adapted just yet. The research conducted involved analyzing the effect of power factor correction and maximum power point tracking algorithm in AC/DC converters for wind turbine applications. Although maximum power to the load is always desired, most converters only take electrical efficiency into consideration. However, not only the electrical efficiency must be considered, but the mechanical energy as well. If the converter is designed to look like a purely resistive load and not a switched load, a wind turbine is able to supply the maximum power with lower conduction loss at the input side due to high current spikes. Two power converters, VIENNA with buck converter and a Buck-boost converter, were designed and experimentally analyzed. A unique approach of controlling the MPPT algorithm through a conductance G for PFC is proposed and applied in the VIENNA topology. On the other hand, the Buck-boost only operates MPPT. With the same wind profile applied for both converters, an increase in power drawn from the input increased when PFC was used even when the power level was low. Both topologies present their own unique advantages. The main advantage for the VIENNA converter is that PFC allowed more power extraction from the turbine, increasing both electrical and mechanical efficiency. The buck-boost converter, on the other hand, presents a very low component count which decreases the overall cost and volume. Therefore, a small, cost-effective converter that maximizes the power transfer from a small power wind turbine to a DC load, can motivate consumers to utilize the power available from the wind.
M.S.E.E.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering MSEE

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Mena, Lopez Hugo Eduardo. "Maximum power tracking control scheme for wind generator systems". Thesis, Texas A&M University, 2007. http://hdl.handle.net/1969.1/85828.

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The purpose of this work is to develop a maximum power tracking control strategy for variable speed wind turbine systems. Modern wind turbine control systems are slow, and they depend on the design parameters of the turbine and use wind and/or rotor speed measurements as control variable inputs. The dependence on the accuracy of the measurement devices makes the controller less reliable. The proposed control scheme is based on the stiff system concept and provides a fast response and a dynamic solution to the complicated aerodynamic system. This control scheme provides a response to the wind changes without the knowledge of wind speed and turbine parameters. The system consists of a permanent magnet synchronous machine (PMSM), a passive rectifier, a dc/dc boost converter, a current controlled voltage source inverter, and a microcontroller that commands the dc/dc converter to control the generator for maximum power extraction. The microcontroller will also be able to control the current output of the three-phase inverter. In this work, the aerodynamic characteristics of wind turbines and the power conversion system topology are explained. The maximum power tracking control algorithm with a variable step estimator is introduced and the modeling and simulation of the wind turbine generator system using the MATLAB/SIMULINK® software is presented and its results show, at least in principle, that the maximum power tracking algorithm developed is suitable for wind turbine generation systems.

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Li, L. "Maximum power control of permanent magnet synchronous generator based wind power generation systems". Thesis, University of Liverpool, 2016. http://livrepository.liverpool.ac.uk/3006695/.

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Duncan, Joseph 1981. "A global maximum power point tracking DC-DC converter". Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/33152.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.
Includes bibliographical references (p. 79-80).
This thesis describes the design, and validation of a maximum power point tracking DC-DC converter capable of following the true global maximum power point in the presence of other local maximum. It does this without the use of costly components such as analog-to-digital converters and microprocessors. It substantially increases the efficiency of solar power conversion by allowing solar cells to operate at their ideal operating point regardless of changes in load, and illumination. The converter switches between a dithering algorithm which tracks the local maximum and a global search algorithm for ensuring that the converter is operating at the true global maximum.
by Joseph Duncan.
M.Eng.

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Elmes, John. "MAXIMUM ENERGY HARVESTING CONTROL FOROSCILLATING ENERGY HARVESTING SYSTEMS". Master's thesis, University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3400.

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This thesis presents an optimal method of designing and controlling an oscillating energy harvesting system. Many new and emerging energy harvesting systems, such as the energy harvesting backpack and ocean wave energy harvesting, capture energy normally expelled through mechanical interactions. Often the nature of the system indicates slow system time constants and unsteady AC voltages. This paper reveals a method for achieving maximum energy harvesting from such sources with fast determination of the optimal operating condition. An energy harvesting backpack, which captures energy from the interaction between the user and the spring decoupled load, is presented in this paper. The new control strategy, maximum energy harvesting control (MEHC), is developed and applied to the energy harvesting backpack system to evaluate the improvement of the MEHC over the basic maximum power point tracking algorithm.
M.S.E.E.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering MSEE

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10

Aashoor, Fathi. "Maximum power point tracking techniques for photovoltaic water pumping system". Thesis, University of Bath, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.683537.

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An investigation into the design of a stand-alone photovoltaic water pumping system for supplying rural areas is presented. It includes a study of system components and their modelling. The PV water pumping system comprises a solar-cell-array, DC-DC buck chopper and permanent-magnet DC motor driving a centrifugal pump. The thesis focuses on increasing energy extraction by improving maximum power point tracking (MPPT). From different MPPT techniques previously proposed, the perturb and observe (P&O) technique is developed because of its ease of implementation and low implementation cost. A modified variable step-size P&O MPPT algorithm is investigated which uses fuzzy logic to automatically adjust step-size to better track maximum power point. Two other MPPT methods are investigated: a new artificial neural network (ANN) method and fuzzy logic (FL) based method. These use PV source output power and the speed of the DC pump motor as input variables. Both generate pulse width modulation (PWM) control signals to continually adjust the buck converter to maximize power from the PV array, and thus motor speed and the water discharge rate of a centrifugal pump. System elements are individually modelled in MATLAB/SIMULINK and then connected to assess performance under different PV irradiation levels. First, the MP&O MPPT technique is compared with the conventional P&O MPPT algorithm. The results show that the MP&O MPPT has faster dynamic response and eliminates oscillations around the MPP under steady-state conditions. The three proposed MPPT methods are implemented in the simulated PV water pumping system and compared. The results confirm that the new methods have improved energy extraction and dynamic tracking compared with simpler methods.

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Libri sul tema "Maximum power"

1

Vantine, Julia. Maximum food power for women. Emmaus, Pa: Rodale, 2001.

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Bompa, Tudor O. Power training for sport: Plyometrics for maximum power development. Oakville, Ont: Mosaic Press, 1996.

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Canada, Coaching Association of, a cura di. Power training for sport: Plyometrics for maximum power development. Gloucester, Ont: Coaching Association of Canada, 1993.

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Explosive power & strength: Complex training for maximum results. Champaign, IL: Human Kinetics, 1996.

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Maximum influence: The 12 universal laws of power persuasion. New York: American Management Association, 2004.

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1930-, Winter Ruth, e Winter Arthur 1922-, a cura di. Smart food: Diet and nutrition for maximum brain power. New York: St. Martin's Griffin, 1999.

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1924-, Odum Howard T., e Hall Charles A. S, a cura di. Maximum power: The ideas and applications of H.T. Odum. Niwot, CO: University Press of Colorado, 1995.

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Mortensen, Kurt W. Maximum influence: The 12 universal laws of power persuasion. New York: AMACOM - American Management Association, 2013.

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Grant, Reg. The power sermon: Countdown to quality messages for maximum impact. Grand Rapids, Mich: Baker Books, 1993.

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Eltamaly, Ali M., e Almoataz Y. Abdelaziz, a cura di. Modern Maximum Power Point Tracking Techniques for Photovoltaic Energy Systems. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-05578-3.

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Capitoli di libri sul tema "Maximum power"

1

Weik, Martin H. "maximum input power". In Computer Science and Communications Dictionary, 987. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_11206.

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Zeng, Gengsheng Lawrence, e Megan Zeng. "Maximum Power Transfer". In Electric Circuits, 93–96. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-60515-5_13.

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Weik, Martin H. "receiver maximum input power". In Computer Science and Communications Dictionary, 1427. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_15638.

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Hall, Charles A. S. "Maximum Power and Biology". In Lecture Notes in Energy, 73–86. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-47821-0_7.

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Jordan, Carl F. "Entropy and Maximum Power". In Evolution from a Thermodynamic Perspective, 113–27. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-85186-6_9.

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Zhong, Wenxing, Dehong Xu e Ron Shu Yuen Hui. "Review of Maximum-Efficiency-Operation Techniques". In Wireless Power Transfer, 77–98. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2441-7_7.

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Weik, Martin H. "optical receiver maximum input power". In Computer Science and Communications Dictionary, 1184. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_13129.

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Sroufe, Robert P., Craig E. Stevenson e Beth A. Eckenrode. "Operating Buildings for Maximum Benefit". In The Power of Existing Buildings, 123–51. Washington, DC: Island Press/Center for Resource Economics, 2019. http://dx.doi.org/10.5822/978-1-64283-051-4_8.

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Orekan, Taofeek, e Peng Zhang. "Maximum Power Efficiency Tracking for UWPT". In Underwater Wireless Power Transfer, 51–67. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-02562-5_4.

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Abdel-Salam, Mazen, Mohamed-Tharwat EL-Mohandes e Mohamed Goda. "History of Maximum Power Point Tracking". In Modern Maximum Power Point Tracking Techniques for Photovoltaic Energy Systems, 1–29. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05578-3_1.

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Atti di convegni sul tema "Maximum power"

1

Ganesan, Karthik, e Lizy K. John. "MAximum Multicore POwer (MAMPO)". In 2011 International Conference for High Performance Computing, Networking, Storage and Analysis. New York, New York, USA: ACM Press, 2011. http://dx.doi.org/10.1145/2063384.2063455.

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Abdallah, M. N., T. K. Sarkar e M. Salazar-Palma. "Maximum power transfer versus efficiency". In 2016 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE, 2016. http://dx.doi.org/10.1109/aps.2016.7695800.

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Krishanan, Priya R., Sajan Joseph, K. K. Anil Kumar e Avinash Kumar. "Generalized maximum power point tracker". In 2013 Annual International Conference on Emerging Research Areas (AICERA) - 2013 International Conference on Microelectronics, Communications and Renewable Energy (ICMiCR). IEEE, 2013. http://dx.doi.org/10.1109/aicera-icmicr.2013.6575941.

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Al-Subhi, A., e I. El-Amin. "Maximum power point tracking of photovoltaic systems by accurate prediction of maximum power voltage". In Smart Cities Symposium 2018. Institution of Engineering and Technology, 2018. http://dx.doi.org/10.1049/cp.2018.1373.

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Siri, Kasemsan, Frank Chen e Majd Batarseh. "Unified maximum power tracking among distributed power sources". In 2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014. IEEE, 2014. http://dx.doi.org/10.1109/apec.2014.6803729.

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Xiaodong Zhang, Wenlong Li e Jiangui Li. "Thermoelectric power generation with maximum power point tracking". In 8th International Conference on Advances in Power System Control, Operation and Management (APSCOM 2009). IET, 2009. http://dx.doi.org/10.1049/cp.2009.1787.

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Siri, Kasemsan. "Group maximum power tracking for distributed power sources". In 2013 IEEE Aerospace Conference. IEEE, 2013. http://dx.doi.org/10.1109/aero.2013.6497400.

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Siri, Kasemsan. "System Maximum Power Tracking among distributed power sources". In 2014 IEEE Aerospace Conference. IEEE, 2014. http://dx.doi.org/10.1109/aero.2014.6836200.

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Siri, Kasemsan. "Group Maximum Power Tracking among Distributed Power Sources". In 11th International Energy Conversion Engineering Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2013. http://dx.doi.org/10.2514/6.2013-3819.

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Roy, Rajib Baran, Jerome Cros, Anup Nandi e Towsif Ahmed. "Maximum Power Tracking by Neural Network". In 2020 8th International Conference on Reliability, Infocom Technologies and Optimization (Trends and Future Directions) (ICRITO). IEEE, 2020. http://dx.doi.org/10.1109/icrito48877.2020.9197882.

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Rapporti di organizzazioni sul tema "Maximum power"

1

Clendenin, J. LCLS Maximum Credible Beam Power. Office of Scientific and Technical Information (OSTI), gennaio 2005. http://dx.doi.org/10.2172/839646.

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Clendenin, J. Maximum Beam Power and Nominal Beam Losses at S-20. Office of Scientific and Technical Information (OSTI), gennaio 2005. http://dx.doi.org/10.2172/839690.

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3

Bonn, R., J. Ginn e J. Zirzow. Test report on the Abacus 30 kW bimode{reg_sign} inverter and maximum power tracker (MPT). Office of Scientific and Technical Information (OSTI), giugno 1995. http://dx.doi.org/10.2172/95191.

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4

Rao, D. V., J. L. Darby, S. B. Ross e R. A. Clark. Determination of maximum reactor power level consistent with the requirement that flow reversal occurs without fuel damage. Office of Scientific and Technical Information (OSTI), aprile 1990. http://dx.doi.org/10.2172/106410.

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Kozioziemski, B. J. Re-Assessing the Maximum Allowed Infrared (IR) Power for Enchanced Layering in a Conduction Dominated Cryogenic NIF-Scale Hohlraum. Office of Scientific and Technical Information (OSTI), agosto 2003. http://dx.doi.org/10.2172/15005143.

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Allen, Luke, Joon Lim, Robert Haehnel e Ian Detwiller. Rotor blade design framework for airfoil shape optimization with performance considerations. Engineer Research and Development Center (U.S.), giugno 2021. http://dx.doi.org/10.21079/11681/41037.

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Abstract (sommario):

A framework for optimizing rotor blade airfoil shape is presented. The framework uses two digital workflows created within the Galaxy Simulation Builder (GSB) software package. The first is a workflow enabling the automated creation of a surrogate model for predicting airfoil performance coefficients. An accurate surrogate model for the rapid generation of airfoil coefficient tables has been developed using linear interpolation techniques that is based on C81Gen and ARC2D CFD codes. The second workflow defines the rotor blade optimization problem using GSB and the Dakota numerical optimization library. The presented example uses a quasi-Newton optimization algorithm to optimize the tip region of the UH-60A main rotor blade with respect to vehicle performance. This is accomplished by morphing the blade tip airfoil shape for optimum power, subject to a constraint on the maximum pitch link load.

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Amengual, Dante, Xinyue Bei, Marine Carrasco e Enrique Sentana. Score-type tests for normal mixtures. CIRANO, gennaio 2023. http://dx.doi.org/10.54932/uxsg1990.

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Testing normality against discrete normal mixtures is complex because some parameters turn increasingly underidentified along alternative ways of approaching the null, others are inequality constrained, and several higher-order derivatives become identically 0. These problems make the maximum of the alternative model log-likelihood function numerically unreliable. We propose score-type tests asymptotically equivalent to the likelihood ratio as the largest of two simple intuitive statistics that only require estimation under the null. One novelty of our approach is that we treat symmetrically both ways of writing the null hypothesis without excluding any region of the parameter space. We derive the asymptotic distribution of our tests under the null and sequences of local alternatives. We also show that their asymptotic distribution is the same whether applied to observations or standardized residuals from heteroskedastic regression models. Finally, we study their power in simulations and apply them to the residuals of Mincer earnings functions.

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Rossi, Ruggero, David Jones, Jaewook Myung, Emily Zikmund, Wulin Yang, Yolanda Alvarez Gallego, Deepak Pant et al. Evaluating a multi-panel air cathode through electrochemical and biotic tests. Engineer Research and Development Center (U.S.), dicembre 2022. http://dx.doi.org/10.21079/11681/46320.

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To scale up microbial fuel cells (MFCs), larger cathodes need to be developed that can use air directly, rather than dissolved oxygen, and have good electrochemical performance. A new type of cathode design was examined here that uses a “window-pane” approach with fifteen smaller cathodes welded to a single conductive metal sheet to maintain good electrical conductivity across the cathode with an increase in total area. Abiotic electrochemical tests were conducted to evaluate the impact of the cathode size (exposed areas of 7 cm², 33 cm², and 6200 cm²) on performance for all cathodes having the same active catalyst material. Increasing the size of the exposed area of the electrodes to the electrolyte from 7 cm² to 33 cm² (a single cathode panel) decreased the cathode potential by 5%, and a further increase in size to 6200 cm² using the multi-panel cathode reduced the electrode potential by 55% (at 0.6 A m⁻²), in a 50 mM phosphate buffer solution (PBS). In 85 L MFC tests with the largest cathode using wastewater as a fuel, the maximum power density based on polarization data was 0.083 ± 0.006Wm⁻² using 22 brush anodes to fully cover the cathode, and 0.061 ± 0.003Wm⁻² with 8 brush anodes (40% of cathode projected area) compared to 0.304 ± 0.009Wm⁻² obtained in the 28 mL MFC. Recovering power from large MFCs will therefore be challenging, but several approaches identified in this study can be pursued to maintain performance when increasing the size of the electrodes.

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Jones, R. B., e J. D. Jr Cogan. Maximum credible event determination for the surveillance powder samples and their handling containers. Office of Scientific and Technical Information (OSTI), settembre 1991. http://dx.doi.org/10.2172/6208092.

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Findlay, Trevor. The Role of International Organizations in WMD Compliance and Enforcement: Autonomy, Agency, and Influence. The United Nations Institute for Disarmament Research, dicembre 2020. http://dx.doi.org/10.37559/wmd/20/wmdce9.

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Abstract (sommario):

Major multilateral arms control and disarmament treaties dealing with weapons of mass destruction (WMD) often have mandated an international organization to monitor and verify State party compliance and to handle cases of non-compliance. There are marked differences in the mandates and technical capabilities of these bodies. Nonetheless, they often face the same operational and existential challenges. This report looks at the role of multilateral verification bodies, especially their secretariats, in dealing with compliance and enforcement, the extent to which they achieve “agency” and “influence” in doing so, and whether and how such capacities might be enhanced. In WMD organizations it is the governing bodies that make decisions about noncompliance and enforcement. The role of their secretariats is to manage the monitoring and verification systems, analyse the resulting data – and data from other permitted sources – and alert their governing bodies to suspicions of non-compliance. Secretariats are expected to be impartial, technically oriented and professional. It is when a serious allegation of non-compliance arises that their role becomes most sensitive politically and most vital. The credibility of Secretariats in these instances will depend on the agency and influence that they have accumulated. There are numerous ways in which an international secretariat can position itself for maximum agency and influence, essentially by making itself indispensable to member States and the broader international community. It can achieve this by engaging with multiple stakeholders, aiming for excellence in its human and technical resources, providing timely and sustainable implementation assistance, ensuring an appropriate organizational culture and, perhaps most of all, understanding that knowledge is power. The challenge for supporters of international verification organizations is to enhance those elements that give them agency and influence and minimize those that lead to inefficiencies, dysfunction and, most damaging of all, political interference in verification and compliance judgements.

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