The Experts below are selected from a list of 6105 Experts worldwide ranked by ideXlab platform
Frede Blaabjerg - One of the best experts on this subject based on the ideXlab platform.
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A Hybrid PV-Battery/Supercapacitor System and a Basic Active Power Control Proposal in MATLAB/Simulink
Electronics, 2020Co-Authors: Mustafa Ergin Şahin, Frede BlaabjergAbstract:An increase in the integration of renewable energy generation worldwide brings along some challenges to energy Systems. Energy Systems need to be regulated following grid codes for the grid stability and efficiency of renewable energy utilization. The main problems that are on the active side can be caused by excessive power generation or unregulated energy generation, such as a partially cloudy day. The main problems on the load side can be caused by excessive or unregulated energy demand or nonlinear loads which deteriorate the power quality of the energy networks. This study focuses on the energy generation side as active power control. In this study, the benefits of supercapacitor use in a hybrid Storage System are investigated and analyzed. A hybrid System in which photovoltaic powered and stored the energy in battery and supercapacitor are proposed in this study to solving the main problems in two sides. The supercapacitor model, photovoltaic model, and the proposed hybrid System are designed in MATLAB/Simulink for 6 kW rated power. Also, a new topology is proposed to increase the energy Storage with supercapacitors for a Passive Storage System. The instantaneous peak currents energy is aimed to store in supercapacitors temporarily with this topology. The main advantages of this topology are voltage stabilization in two sides by the supercapacitors and a limitation of the battery load, which directly results in longer battery life and decreases the System cost. The simulation results are investigated for this topology.
Mustafa Ergin Şahin - One of the best experts on this subject based on the ideXlab platform.
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A Hybrid PV-Battery/Supercapacitor System and a Basic Active Power Control Proposal in MATLAB/Simulink
Electronics, 2020Co-Authors: Mustafa Ergin Şahin, Frede BlaabjergAbstract:An increase in the integration of renewable energy generation worldwide brings along some challenges to energy Systems. Energy Systems need to be regulated following grid codes for the grid stability and efficiency of renewable energy utilization. The main problems that are on the active side can be caused by excessive power generation or unregulated energy generation, such as a partially cloudy day. The main problems on the load side can be caused by excessive or unregulated energy demand or nonlinear loads which deteriorate the power quality of the energy networks. This study focuses on the energy generation side as active power control. In this study, the benefits of supercapacitor use in a hybrid Storage System are investigated and analyzed. A hybrid System in which photovoltaic powered and stored the energy in battery and supercapacitor are proposed in this study to solving the main problems in two sides. The supercapacitor model, photovoltaic model, and the proposed hybrid System are designed in MATLAB/Simulink for 6 kW rated power. Also, a new topology is proposed to increase the energy Storage with supercapacitors for a Passive Storage System. The instantaneous peak currents energy is aimed to store in supercapacitors temporarily with this topology. The main advantages of this topology are voltage stabilization in two sides by the supercapacitors and a limitation of the battery load, which directly results in longer battery life and decreases the System cost. The simulation results are investigated for this topology.
Richard J. Allen - One of the best experts on this subject based on the ideXlab platform.
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Working Memory - A Multicomponent Model of Working Memory
Working Memory, 2020Co-Authors: Alan D. Baddeley, Graham J. Hitch, Richard J. AllenAbstract:The multicomponent model aims to provide a broad theoretical framework enabling both more detailed fractionation and analysis of its components, and a capacity for it be used fruitfully beyond the laboratory. In its current form it comprises four interacting components. Two of these are modality-specific memory Storage Systems, one verbal-acoustic, the phonological loop, and one visuospatial, the sketchpad. Information in both these stores can be temporarily maintained via focused attention termed ‘refreshing’, while the phonological loop can also maintain familiar verbalizable material by subvocal or overt rehearsal. Both subSystems are controlled by a third component, the central executive, a supervisory System with limited resources. The central executive is principally concerned with internally directed attentional control processes but also has a role in the attentional selection of perceptual information. Information from these three components is coordinated with information from perception and long-term memory through the fourth component, a multidimensional, multimodal episodic buffer. This component is capable of holding up to around four episodic chunks, and is a valuable but essentially Passive Storage System, controlled by the central executive and accessible to conscious awareness. The multicomponent model has been Systematically developed using a number of experimental tools. These include, principally, similarity effects to identify the type of coding involved, concurrent task methods to assess the contributions of the various subSystems to complex tasks, and neuropsychological evidence, in particular from the study of single cases with very specific deficits. The model continues to evolve and has proved successful both in accounting for a broad range of data on memory and related cognitive areas and in its application to the understanding of a wide range of cognitive activities and populations.
Elizabeth A. L. Stine - One of the best experts on this subject based on the ideXlab platform.
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Aging and the distribution of resources in working memory
Age Differences in Word and Language Processing, 1995Co-Authors: Elizabeth A. L. StineAbstract:Summary While limitations in human information processing capacity have long been acknowledged, the conceptualization of these limitations in experimental psychology has evolved from that of a Passive Storage System to one of an activated subset of an extended knowledge net; rather than a unitary System, this working memory is thought of as a group of distributed capacities or modules, both dynamic and flexible in their operation. The focus of the present chapter has been on age differences in how resources are distributed within this working memory System, particularly in the course of language comprehension. Brinley analyses of reading times do not appear to conform to the patterns observed in response times for correct responses in discrete-trial tasks, e.g., lexical decision, mental rotation. While similar to discrete-trial data in showing an orderly relationship between the latencies of younger and older adults, the slope of the resulting functions appear to be routinely close to unity rather than to the 1.5 typically found in discrete-trials tasks in which time is measured for successful performance. Unlike those of discrete-trial tasks, the Brinley plots of reading time are not directly relevant to the Slowing Hypothesis. Rather, because any individual reading time does not necessarily correspond to a unit of successfully completed processing (e.g., orthographic decoding, lexical access, contextual instantiation, intraconstituent organization, interconstituent integration, integration with world knowledge, etc.), Brinley plots of reading times reflect the relative allocation of processing resources by young and old as text demands increase. The slope of unity suggests a large measure of similarity between resource allocation strategies of younger and older readers. Subsequent memory and comprehension performance, however, often reveal age differences favoring the young, suggesting that age constancy in reading strategy may not be adaptive. The Brinley approach was augmented by the use of regression analyses of reading time in which specific cognitive constructs underlying the reading times could be identified. These analyses substantially supported the Brinley analysis in showing great similarity between how younger and older readers responded to specific text demands, but also suggested that older adults were allocating somewhat less time to developing a cognitive representation of the text-based meaning of the discourse. Older adults who showed high levels of memory performance were those who used a more top-down approach, thus implicating the importance of developing new styles of resource distribution to accommodate processing declines.
Alan D. Baddeley - One of the best experts on this subject based on the ideXlab platform.
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Working Memory - A Multicomponent Model of Working Memory
Working Memory, 2020Co-Authors: Alan D. Baddeley, Graham J. Hitch, Richard J. AllenAbstract:The multicomponent model aims to provide a broad theoretical framework enabling both more detailed fractionation and analysis of its components, and a capacity for it be used fruitfully beyond the laboratory. In its current form it comprises four interacting components. Two of these are modality-specific memory Storage Systems, one verbal-acoustic, the phonological loop, and one visuospatial, the sketchpad. Information in both these stores can be temporarily maintained via focused attention termed ‘refreshing’, while the phonological loop can also maintain familiar verbalizable material by subvocal or overt rehearsal. Both subSystems are controlled by a third component, the central executive, a supervisory System with limited resources. The central executive is principally concerned with internally directed attentional control processes but also has a role in the attentional selection of perceptual information. Information from these three components is coordinated with information from perception and long-term memory through the fourth component, a multidimensional, multimodal episodic buffer. This component is capable of holding up to around four episodic chunks, and is a valuable but essentially Passive Storage System, controlled by the central executive and accessible to conscious awareness. The multicomponent model has been Systematically developed using a number of experimental tools. These include, principally, similarity effects to identify the type of coding involved, concurrent task methods to assess the contributions of the various subSystems to complex tasks, and neuropsychological evidence, in particular from the study of single cases with very specific deficits. The model continues to evolve and has proved successful both in accounting for a broad range of data on memory and related cognitive areas and in its application to the understanding of a wide range of cognitive activities and populations.