Adelian (20 Ergebnisse)

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Taschenbuch. Zustand: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -The goal of this research is to evaluate alternative transmission systems from remote wind farms to the main grid using low-frequency AC technology. Low frequency means a frequency lower than nominal frequency (60/50Hz). The low-frequency AC network can be connected to the power grid at major substations via cyclo-converters that provide a low-cost interconnection and synchronization with the main grid. Cyclo-converter technology is utilized to minimize costs which result in systems of 20/16.66 Hz (for 60/50Hz systems respectively). Low frequency transmission has the potential to provide an attractive solution in terms of economics and technical merits. The optimal voltage level selection for transmission within the wind farm and up to the interconnection with the power grid is investigated. The proposed system is expected to have costs substantially lower than HVDC and conventional HVAC systems. The cost savings will come from the fact that cyclo-converters are used which are much lower in cost than HVDC. Other savings can come from optimizing the topology of the wind farms. Another advantage of the proposed topologies is that existing transformers designed for 60 Hz. 72 pp. Englisch.…

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Taschenbuch. Zustand: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Designing a proper substation grounding system is quite complicated. Many parameters affect its design. In order for a grounding design to be safe, it needs to provide a way to carry the electric currents into the ground under both normal and faulted conditions. Also, it must provide assurance that a person in the vicinity would not be endangered. The grounding portion of substation design will be explored. In order to properly plan and design the grounding grid, calculations of the following will be done: maximum fault current, grid resistance, grid current, safe touch and step voltages, ground potential rise, as well as expected touch and step voltage levels. Background information and guidelines to design a substation grounding grid will be provided. A set of equations will be presented to calculate whether the design is safe, and finally, an example will be provided that can be used as a template. 120 pp. Englisch.…

Taschenbuch. Zustand: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Collocations are one of the most important concerns in EFL classes and materials. They play a significant role in second language learning, especially at intermediate and advanced levels as well. The present study intended to investigate the influence of knowledge of collocation on writing ability of Iranian advanced EFL learners. Based on purposive sampling,this thesis was conducted in Navid Language Institution. Eighty Iranian advanced students participated in this study. Whole group samples were selected from Zarghan and Neyriz branches of Navid Language Institution. The students' writing ability was analyzed to determine the collocations they produced.The participants' productive collocational knowledge was measured by free-writing test:3topics were given to them from which one they chose to write a composition. Their receptive collocational knowledge was measured by a multiple-choice test. Descriptive and inferential statistics were used to analyze the data.Results of the study indicated that knowledge of collocation had no positive effect on production of collocation in free writing by EFL learners, but it had a positive effect on comprehension of collocation by EFl learners. 108 pp. Englisch.…

Zustand: New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. Autor/Autorin: Adelian Mohammad AliMohammad Ali Adelian,Studied M-Tech in Electrical Engineering at Bharati Vidyapeeth Deemed University College of Engineering Pune-India. Supervisor of Transmission Lines and Distribution Systems at Pars Azarakhsh .…

Zustand: New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. Autor/Autorin: Adelian Mohammad AliMohammad Ali Adelian, Studied M-Tech in Electrical Engineering at Bharati Vidyapeeth Deemed University College of Engineering Pune-India. Supervisor of Transmission Lines and Distribution Systems at Pars Azarakhsh.…

Zustand: New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. Autor/Autorin: Adelian MaryamMaryam Adelian, received M.A degree in English language teaching from Yazd, Islamic Azad University, Iran. She has published papers and book nationally.She had 4 years experiences of teaching English as a foreign langua.…

Taschenbuch. Zustand: Neu. This item is printed on demand - Print on Demand Titel. Neuware -The goal of this research is to evaluate alternative transmission systems from remote wind farms to the main grid using low-frequency AC technology. Low frequency means a frequency lower than nominal frequency (60/50Hz). The low-frequency AC network can be connected to the power grid at major substations via cyclo-converters that provide a low-cost interconnection and synchronization with the main grid. Cyclo-converter technology is utilized to minimize costs which result in systems of 20/16.66 Hz (for 60/50Hz systems respectively). Low frequency transmission has the potential to provide an attractive solution in terms of economics and technical merits. The optimal voltage level selection for transmission within the wind farm and up to the interconnection with the power grid is investigated. The proposed system is expected to have costs substantially lower than HVDC and conventional HVAC systems. The cost savings will come from the fact that cyclo-converters are used which are much lower in cost than HVDC. Other savings can come from optimizing the topology of the wind farms. Another advantage of the proposed topologies is that existing transformers designed for 60 Hz.VDM Verlag, Dudweiler Landstraße 99, 66123 Saarbrücken 72 pp. Englisch.…

Taschenbuch. Zustand: Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - The goal of this research is to evaluate alternative transmission systems from remote wind farms to the main grid using low-frequency AC technology. Low frequency means a frequency lower than nominal frequency (60/50Hz). The low-frequency AC network can be connected to the power grid at major substations via cyclo-converters that provide a low-cost interconnection and synchronization with the main grid. Cyclo-converter technology is utilized to minimize costs which result in systems of 20/16.66 Hz (for 60/50Hz systems respectively). Low frequency transmission has the potential to provide an attractive solution in terms of economics and technical merits. The optimal voltage level selection for transmission within the wind farm and up to the interconnection with the power grid is investigated. The proposed system is expected to have costs substantially lower than HVDC and conventional HVAC systems. The cost savings will come from the fact that cyclo-converters are used which are much lower in cost than HVDC. Other savings can come from optimizing the topology of the wind farms. Another advantage of the proposed topologies is that existing transformers designed for 60 Hz.…

Taschenbuch. Zustand: Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - Collocations are one of the most important concerns in EFL classes and materials. They play a significant role in second language learning, especially at intermediate and advanced levels as well. The present study intended to investigate the influence of knowledge of collocation on writing ability of Iranian advanced EFL learners. Based on purposive sampling,this thesis was conducted in Navid Language Institution. Eighty Iranian advanced students participated in this study. Whole group samples were selected from Zarghan and Neyriz branches of Navid Language Institution. The students' writing ability was analyzed to determine the collocations they produced.The participants' productive collocational knowledge was measured by free-writing test:3topics were given to them from which one they chose to write a composition. Their receptive collocational knowledge was measured by a multiple-choice test. Descriptive and inferential statistics were used to analyze the data.Results of the study indicated that knowledge of collocation had no positive effect on production of collocation in free writing by EFL learners, but it had a positive effect on comprehension of collocation by EFl learners.…

Taschenbuch. Zustand: Neu. This item is printed on demand - Print on Demand Titel. Neuware -Designing a proper substation grounding system is quite complicated. Many parameters affect its design. In order for a grounding design to be safe, it needs to provide a way to carry the electric currents into the ground under both normal and faulted conditions. Also, it must provide assurance that a person in the vicinity would not be endangered. The grounding portion of substation design will be explored. In order to properly plan and design the grounding grid, calculations of the following will be done: maximum fault current, grid resistance, grid current, safe touch and step voltages, ground potential rise, as well as expected touch and step voltage levels. Background information and guidelines to design a substation grounding grid will be provided. A set of equations will be presented to calculate whether the design is safe, and finally, an example will be provided that can be used as a template.VDM Verlag, Dudweiler Landstraße 99, 66123 Saarbrücken 120 pp. Englisch.…

Taschenbuch. Zustand: Neu. This item is printed on demand - Print on Demand Titel. Neuware -Collocations are one of the most important concerns in EFL classes and materials. They play a significant role in second language learning, especially at intermediate and advanced levels as well. The present study intended to investigate the influence of knowledge of collocation on writing ability of Iranian advanced EFL learners. Based on purposive sampling,this thesis was conducted in Navid Language Institution. Eighty Iranian advanced students participated in this study. Whole group samples were selected from Zarghan and Neyriz branches of Navid Language Institution. The students' writing ability was analyzed to determine the collocations they produced.The participants' productive collocational knowledge was measured by free-writing test:3topics were given to them from which one they chose to write a composition. Their receptive collocational knowledge was measured by a multiple-choice test. Descriptive and inferential statistics were used to analyze the data.Results of the study indicated that knowledge of collocation had no positive effect on production of collocation in free writing by EFL learners, but it had a positive effect on comprehension of collocation by EFl learners.VDM Verlag, Dudweiler Landstraße 99, 66123 Saarbrücken 108 pp. Englisch.…

Taschenbuch. Zustand: Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - Designing a proper substation grounding system is quite complicated. Many parameters affect its design. In order for a grounding design to be safe, it needs to provide a way to carry the electric currents into the ground under both normal and faulted conditions. Also, it must provide assurance that a person in the vicinity would not be endangered. The grounding portion of substation design will be explored. In order to properly plan and design the grounding grid, calculations of the following will be done: maximum fault current, grid resistance, grid current, safe touch and step voltages, ground potential rise, as well as expected touch and step voltage levels. Background information and guidelines to design a substation grounding grid will be provided. A set of equations will be presented to calculate whether the design is safe, and finally, an example will be provided that can be used as a template.…