Xem 1-20 trên 100 kết quả Power conditioning
  • In writing this book the author has been primarily concerned with the presentation of the basic essentials of power-system operation and analysis to students in the final year of first degree courses at universities and colleges of technology. The emphasis is on the consideration of the system as a whole rather than on the engineering details of its constituents, and the treatment presented is aimed at practical conditions and situations rather than theoretical nicety.

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  • Tham khảo sách 'electricity for refrigeration,heating and air conditioning', kỹ thuật - công nghệ, điện - điện tử phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Power Electronics is the technology associated with efficient conversion, control and conditioning of electric power from its available input into the desired electrical output form. The field of the book is concerned of electrical power processing using electronic devices the key component of which is a switching power converter.

    pdf118p tuanloc_do 04-12-2012 39 8   Download

  • Photo Credit boxing gloves image by jovica antoski from Fotolia.com Combat sports require a high degree of fitness, strength, power and flexibility from its participants. Muscular endurance and core strength are also equally important. Training for combat sports requires that different fitness components be trained on different days so that all aspects of conditioning can be addressed.

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  • Organic expanders play an important role in the lead–acid battery. This study presents the design of an electrochemical method which evaluates the influence of some commercial expanders on the performance of the negative plate. Examination is made of different commercial expander formulations which are prepared in the laboratory under carefully controlled conditions.

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  • Much of the power of probabilistic methods in modelling language comes from their ability to compare several derivations for the same string in the language. An important starting point for the study of such cross-derivational properties is the notion of consistency. The probability model defined by a probabilistic grammar is said to be consistent if the probabilities assigned to all the strings in the language sum to one.

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  • This book is intended for anyone who uses Oracle Reports to build reports. The needs of both novice and advanced users are addressed. Each chapter contains stepby- step instructions to build a report from start to finish. Each report that you build will demonstrate how to use many of the powerful features in Report Builder. Some of the tasks in this manual tell you how to access online help for additional information. If you see a table like the one that follows, use the steps to get more information about the task you are performing:...

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  • This book is intended to give nonelectrical professionals a fundamental understanding of large, interconnected electrical power systems with regard to terminology, electrical concepts, design considerations, construction practices, industry standards, control room operations for both normal and emergency conditions, maintenance, consumption, telecommunications, and safety. Several practical examples, photographs, drawings, and illustrations are provided to help the reader gain a fundamental understanding of electric power systems....

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  • With the proliferation of electronic loads such as computers, the incidence of power quality-related problems is growing. As a result, the uninterruptible power supply (UPS) market has grown significantly in the last few years. What follows is an overview of UPS functions and descriptions of common types of UPSs and backup power sources. 16.1 UPS Functions The primary purpose of a UPS is to provide conditioned, continuous power to its load. Another UPS function that is of growing importance in today’s market is system integration, or the...

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  • Manufacturers base the performance of electronic devices on a perfect battery, a condition that only exists when the battery is new. By reading Batteries in a Portable World, you will acquire a better understanding of the strengths and limitations of the battery, learn about different battery types and discover what conditions are best for a battery. The book is easy and entertaining to read and makes minimal use of technical jargon.

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  • In 1949, at the age of three, holding tight onto my mother's skirt, I ran with my parents and two younger brothers across a Shanghai airport runway. Amid the sound of bombs blasting, we boarded the last commercial flight out of China. From a life of affluence and privilege, my family was reduced to the condition of faceless immigrants among millions in Taiwan who had fled the conquering communists. All the possessions we were able to salvage from the devastation of our lives fit into the suitcases my parents carried....

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  • Grid-connected photovoltaic power systems are power systems energised by photovoltaic panels which are connected to the utility grid. Grid-connected photovoltaic power systems comprise of Photovoltaic panels, MPPT, solar inverters, power conditioning units and grid connection equipments. Unlike Stand-alone photovoltaic power systems these systems do not have batteries. When conditions are right, the grid-connected PV system supplies the excess power, beyond consumption by the connected load, to the utility grid.[1]...

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  • Despite worldwide evidence of the low levels of female participation in social, educational, economic and political spheres, there is still a tendency to see it as a real problem only in a limited number of countries. Yet, as noted above, the reality is that no country in the world, no matter how advanced, has achieved true gender equality, as measured by comparable decision- making power, equal opportunity for education and advancement, and equal participation and status in all walks of human endeavour.

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  • OF all disciplines necessary to the criminal justice in addition to the knowledge of law, the most important are those derived from psychology. For such sciences teach him to know the type of man it is his business to deal with. Now psychological sciences appear in various forms. There is a native psychology, a keenness of vision given in the march of experience, to a few fortunate persons, who see rightly without having learned the laws which determine the course of events, or without being even conscious of them.

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  • This chapter reviews some of the basic magnitudes of solar radiation and some of the basics of PSpice. A brief description of a photovoltaic system is followed by definitions of spectral irradiance, irradiance and solar radiation. Basic commands and syntax of the sentences most commonly used in this book are shortly summarized and used to write PSpice files for the AM1 SG and AM0 sun spectra, which are used to plot the values of the spectral irradiance as a function of the wavelength and compare them with a black body radiation.

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  • Uncontrolled Single-Phase Rectifiers Sam Guccione Single-Phase Half-Wave Rectifiers Operation A single-phase half-wave rectifier consists of a single diode connected as shown in Fig. 4.1. This is the simplest of the rectifier circuits. It produces an output waveform that is half of the incoming AC voltage waveform. The positive pulse output waveform shown in Fig. 4.1 occurs because of the forward-bias condition of the diode. A diode

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  • This study investigated the effects of Na 2 SO4 additive in the positive electrode on the performance of sealed lead-acid cells. The additive Na 2 SO4 in the cured plates can reduce the 4BS crystal size, which produces a smaller a-PbO 2 and b-PbO 2 crystal size in the formed plates, which will have a larger surface area. The plate’s chemical composition is independent of the amount of Na 2 SO4 additive in the positive electrodes. Plate composition relies only on the cure temperature conditions. ...

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  • This chapter discusses aspects of the use of stationary batteries within the Deutsche Telekom AG. The names Deutsche Telekom or Telekom shall be used, although the responsibility for the area power supply for telecommunication networks was transferred to the Deutsche Telekom Immobilien und Service GmbH, (De Te Immobilien), a 100% subsidiary company of the Telekom, since January 1, 1996.

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  • Hydrogen economy represents the future of human civilization. Limited resources of our planet are compelling us to turn to renewable clean energy resources and hydrogen figures prominently as the energy carrier of a future sustainable energy system. There are significant challenges to be overcome in order to make hydrogen viable, in production, storage and power generation, while safety of operation is an ever-present factor that determines success or failure of a proposed solution.

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  • Even if this approach provides insights about potential target country markets, no information is provided on the within-country consumers‘ heterogeneity and their response to marketing efforts. In this context it has to be stated that the globalization of consumer markets and the global acceptance of products and brands lead to a globalization of consumers‘ behaviors and attitudes.

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