Author: Takeshi Yao
Publisher: Springer Science & Business Media
ISBN: 4431540679
Category : Science
Languages : en
Pages : 332
Book Description
Since 2008, the Global Center of Excellence (COE) at Kyoto University, Japan, has been engaged in a program called “Energy Science in the Age of Global Warming—Toward a CO2 Zero-Emission Energy System.” Its aim is to establish an international education and research platform to foster educators, researchers, and policy makers who can develop technologies and propose policies for establishing a CO2 zero-emission society no longer dependent on fossil fuels. It is well known that the energy problem cannot simply be labeled a technological one, as it is also deeply involved with social and economic issues. The establishment of a “low-carbon energy science” as an interdisciplinary field integrating social sciences with natural sciences is necessary. The Global COE is setting out a zero-emission technology roadmap and is promoting socioeconomic studies of energy, studies of new technologies for renewable energies, and research for advanced nuclear energy. It has also established the Global COE Unit for Energy Science Education to support young researchers as they apply their skills and knowledge and a broad international perspective to respond to issues of energy and the environment in our societies. Comprising the proceedings of the Third International Symposium of the Global COE Program, this book follows on the earlier volumes Zero-Carbon Energy Kyoto 2009 and 2010, published in March 2010 and February 2011, respectively.
Zero-Carbon Energy Kyoto 2011
Author: Takeshi Yao
Publisher: Springer Science & Business Media
ISBN: 4431540679
Category : Science
Languages : en
Pages : 332
Book Description
Since 2008, the Global Center of Excellence (COE) at Kyoto University, Japan, has been engaged in a program called “Energy Science in the Age of Global Warming—Toward a CO2 Zero-Emission Energy System.” Its aim is to establish an international education and research platform to foster educators, researchers, and policy makers who can develop technologies and propose policies for establishing a CO2 zero-emission society no longer dependent on fossil fuels. It is well known that the energy problem cannot simply be labeled a technological one, as it is also deeply involved with social and economic issues. The establishment of a “low-carbon energy science” as an interdisciplinary field integrating social sciences with natural sciences is necessary. The Global COE is setting out a zero-emission technology roadmap and is promoting socioeconomic studies of energy, studies of new technologies for renewable energies, and research for advanced nuclear energy. It has also established the Global COE Unit for Energy Science Education to support young researchers as they apply their skills and knowledge and a broad international perspective to respond to issues of energy and the environment in our societies. Comprising the proceedings of the Third International Symposium of the Global COE Program, this book follows on the earlier volumes Zero-Carbon Energy Kyoto 2009 and 2010, published in March 2010 and February 2011, respectively.
Publisher: Springer Science & Business Media
ISBN: 4431540679
Category : Science
Languages : en
Pages : 332
Book Description
Since 2008, the Global Center of Excellence (COE) at Kyoto University, Japan, has been engaged in a program called “Energy Science in the Age of Global Warming—Toward a CO2 Zero-Emission Energy System.” Its aim is to establish an international education and research platform to foster educators, researchers, and policy makers who can develop technologies and propose policies for establishing a CO2 zero-emission society no longer dependent on fossil fuels. It is well known that the energy problem cannot simply be labeled a technological one, as it is also deeply involved with social and economic issues. The establishment of a “low-carbon energy science” as an interdisciplinary field integrating social sciences with natural sciences is necessary. The Global COE is setting out a zero-emission technology roadmap and is promoting socioeconomic studies of energy, studies of new technologies for renewable energies, and research for advanced nuclear energy. It has also established the Global COE Unit for Energy Science Education to support young researchers as they apply their skills and knowledge and a broad international perspective to respond to issues of energy and the environment in our societies. Comprising the proceedings of the Third International Symposium of the Global COE Program, this book follows on the earlier volumes Zero-Carbon Energy Kyoto 2009 and 2010, published in March 2010 and February 2011, respectively.
Zero-Carbon Energy Kyoto 2012
Author: Takeshi Yao
Publisher: Springer Science & Business Media
ISBN: 4431542647
Category : Technology & Engineering
Languages : en
Pages : 282
Book Description
The Global COE is setting out a zero-emission technology roadmap and is promoting socioeconomic studies of energy, studies of new technologies for renewable energies, and research for advanced nuclear energy. It has also established the Global COE Unit for Energy Science Education to support young researchers as they apply their skills and knowledge and a broad international perspective to respond to issues of energy and the environment in our societies. This book follows on the earlier volumes Zero-Carbon Energy Kyoto 2009, 2010, and 2011.
Publisher: Springer Science & Business Media
ISBN: 4431542647
Category : Technology & Engineering
Languages : en
Pages : 282
Book Description
The Global COE is setting out a zero-emission technology roadmap and is promoting socioeconomic studies of energy, studies of new technologies for renewable energies, and research for advanced nuclear energy. It has also established the Global COE Unit for Energy Science Education to support young researchers as they apply their skills and knowledge and a broad international perspective to respond to issues of energy and the environment in our societies. This book follows on the earlier volumes Zero-Carbon Energy Kyoto 2009, 2010, and 2011.
Zero-Carbon Energy Kyoto 2011
Author: Takeshi Yao
Publisher: Springer Science & Business Media
ISBN: 4431540660
Category : Science
Languages : en
Pages : 333
Book Description
Since 2008, the Global Center of Excellence (COE) at Kyoto University, Japan, has been engaged in a program called “Energy Science in the Age of Global Warming—Toward a CO2 Zero-Emission Energy System.” Its aim is to establish an international education and research platform to foster educators, researchers, and policy makers who can develop technologies and propose policies for establishing a CO2 zero-emission society no longer dependent on fossil fuels. It is well known that the energy problem cannot simply be labeled a technological one, as it is also deeply involved with social and economic issues. The establishment of a “low-carbon energy science” as an interdisciplinary field integrating social sciences with natural sciences is necessary. The Global COE is setting out a zero-emission technology roadmap and is promoting socioeconomic studies of energy, studies of new technologies for renewable energies, and research for advanced nuclear energy. It has also established the Global COE Unit for Energy Science Education to support young researchers as they apply their skills and knowledge and a broad international perspective to respond to issues of energy and the environment in our societies. Comprising the proceedings of the Third International Symposium of the Global COE Program, this book follows on the earlier volumes Zero-Carbon Energy Kyoto 2009 and 2010, published in March 2010 and February 2011, respectively.
Publisher: Springer Science & Business Media
ISBN: 4431540660
Category : Science
Languages : en
Pages : 333
Book Description
Since 2008, the Global Center of Excellence (COE) at Kyoto University, Japan, has been engaged in a program called “Energy Science in the Age of Global Warming—Toward a CO2 Zero-Emission Energy System.” Its aim is to establish an international education and research platform to foster educators, researchers, and policy makers who can develop technologies and propose policies for establishing a CO2 zero-emission society no longer dependent on fossil fuels. It is well known that the energy problem cannot simply be labeled a technological one, as it is also deeply involved with social and economic issues. The establishment of a “low-carbon energy science” as an interdisciplinary field integrating social sciences with natural sciences is necessary. The Global COE is setting out a zero-emission technology roadmap and is promoting socioeconomic studies of energy, studies of new technologies for renewable energies, and research for advanced nuclear energy. It has also established the Global COE Unit for Energy Science Education to support young researchers as they apply their skills and knowledge and a broad international perspective to respond to issues of energy and the environment in our societies. Comprising the proceedings of the Third International Symposium of the Global COE Program, this book follows on the earlier volumes Zero-Carbon Energy Kyoto 2009 and 2010, published in March 2010 and February 2011, respectively.
Zero-Carbon Energy Kyoto 2010
Author: Takeshi Yao
Publisher: Springer Science & Business Media
ISBN: 4431539107
Category : Technology & Engineering
Languages : en
Pages : 318
Book Description
Since 2008, the Global Center of Excellence (COE) at Kyoto University, Japan, has been engaged in a program called “Energy Science in the Age of Global Warming—Toward a CO2 Zero-Emission Energy System.” Its aim is to establish an international education and research platform to foster educators, researchers, and policy makers who can develop technologies and propose policies for establishing a CO2 zero-emission society no longer dependent on fossil fuels. It is well known that the energy problem cannot simply be labeled a technological one, as it is also deeply involved with social and economic issues. The establishment of a “low-carbon energy science” as an interdisciplinary field integrating social sciences with natural sciences is necessary. The Global COE is setting out a zero-emission technology roadmap and is promoting socioeconomic studies of energy, studies of new technologies for renewable energies, and research for advanced nuclear energy. It has also established the Global COE Unit for Energy Science Education to support young researchers as they apply their skills and knowledge and a broad international perspective to respond to issues of energy and the environment in our societies. Comprising the proceedings of the Second International Symposium of the Global COE Program, this book follows on the earlier volume Zero-Carbon Energy Kyoto 2009, published in March 2010.
Publisher: Springer Science & Business Media
ISBN: 4431539107
Category : Technology & Engineering
Languages : en
Pages : 318
Book Description
Since 2008, the Global Center of Excellence (COE) at Kyoto University, Japan, has been engaged in a program called “Energy Science in the Age of Global Warming—Toward a CO2 Zero-Emission Energy System.” Its aim is to establish an international education and research platform to foster educators, researchers, and policy makers who can develop technologies and propose policies for establishing a CO2 zero-emission society no longer dependent on fossil fuels. It is well known that the energy problem cannot simply be labeled a technological one, as it is also deeply involved with social and economic issues. The establishment of a “low-carbon energy science” as an interdisciplinary field integrating social sciences with natural sciences is necessary. The Global COE is setting out a zero-emission technology roadmap and is promoting socioeconomic studies of energy, studies of new technologies for renewable energies, and research for advanced nuclear energy. It has also established the Global COE Unit for Energy Science Education to support young researchers as they apply their skills and knowledge and a broad international perspective to respond to issues of energy and the environment in our societies. Comprising the proceedings of the Second International Symposium of the Global COE Program, this book follows on the earlier volume Zero-Carbon Energy Kyoto 2009, published in March 2010.
Energy Efficiency
Author: Steven Fawkes
Publisher: Routledge
ISBN: 131714371X
Category : Nature
Languages : en
Pages : 286
Book Description
Energy risk has reappeared on the corporate and social agenda with a bang and the complexity of the issues has increased many-fold since the days of the last great wave of concern following the oil crises of the 1970s. Steven Fawkes’ Energy Efficiency is a comprehensive guide for managers and policy-makers to the fundamental questions underpinning energy-efficiency and our responses to it: ¢ what do we really mean by energy efficiency? ¢ what is the potential (in different dimensions)? ¢ why it is important? ¢ what management processes lead to optimisation of energy efficiency? ¢ what technologies are useful for improving energy efficiency? ¢ what policies can be used to promote energy efficiency? ¢ how can energy efficiency be financed? ¢ how can energy suppliers engage with energy efficiency? The result is the most comprehensive review to-date of the barriers and opportunities associated with improving energy efficiency. Clearly written and erudite, Steven Fawkes addresses every aspect of energy efficiency, including the huge and vitally important untapped potential offered by effective energy management and the application of existing technology. He also identifies barriers, such as the rebound effect and how they can be mitigated and he provides a comprehensive review of innovative energy efficiency financing options. This book is a ’must read’ for anyone with an interest in energy supply and demand reduction.
Publisher: Routledge
ISBN: 131714371X
Category : Nature
Languages : en
Pages : 286
Book Description
Energy risk has reappeared on the corporate and social agenda with a bang and the complexity of the issues has increased many-fold since the days of the last great wave of concern following the oil crises of the 1970s. Steven Fawkes’ Energy Efficiency is a comprehensive guide for managers and policy-makers to the fundamental questions underpinning energy-efficiency and our responses to it: ¢ what do we really mean by energy efficiency? ¢ what is the potential (in different dimensions)? ¢ why it is important? ¢ what management processes lead to optimisation of energy efficiency? ¢ what technologies are useful for improving energy efficiency? ¢ what policies can be used to promote energy efficiency? ¢ how can energy efficiency be financed? ¢ how can energy suppliers engage with energy efficiency? The result is the most comprehensive review to-date of the barriers and opportunities associated with improving energy efficiency. Clearly written and erudite, Steven Fawkes addresses every aspect of energy efficiency, including the huge and vitally important untapped potential offered by effective energy management and the application of existing technology. He also identifies barriers, such as the rebound effect and how they can be mitigated and he provides a comprehensive review of innovative energy efficiency financing options. This book is a ’must read’ for anyone with an interest in energy supply and demand reduction.
America Goes Green [3 volumes]
Author: Kim Kennedy White
Publisher: Bloomsbury Publishing USA
ISBN:
Category : Nature
Languages : en
Pages : 1660
Book Description
This three-volume encyclopedia explores the evolution of green ideology and eco-friendly practices in contemporary American culture, ranging from the creation of regional and national guidelines for green living to the publication of an increasing number of environmental blogs written from the layperson's perspective. Evidence of humanity's detrimental impact on the environment is mounting. As Americans, we are confronted daily with news stories, blogs, and social media commentary about the necessity of practicing green behaviors to offset environmental damage. This essential reference is a fascinating review of the issues surrounding green living, including the impact of this lifestyle on Americans' time and money, the information needed to adhere to green principles in the 21st century, and case studies and examples of successful implementation. America Goes Green: An Encyclopedia of Eco-Friendly Culture in the United States examines this gripping topic through 3 volumes organized by A–Z entries across 11 themes; state-by-state essays grouped by region; and references including primary source documents, bibliography, glossary, and green resources. This timely encyclopedia explores the development of an eco-friendly culture in America, and entries present the debates, viewpoints, and challenges of green living.
Publisher: Bloomsbury Publishing USA
ISBN:
Category : Nature
Languages : en
Pages : 1660
Book Description
This three-volume encyclopedia explores the evolution of green ideology and eco-friendly practices in contemporary American culture, ranging from the creation of regional and national guidelines for green living to the publication of an increasing number of environmental blogs written from the layperson's perspective. Evidence of humanity's detrimental impact on the environment is mounting. As Americans, we are confronted daily with news stories, blogs, and social media commentary about the necessity of practicing green behaviors to offset environmental damage. This essential reference is a fascinating review of the issues surrounding green living, including the impact of this lifestyle on Americans' time and money, the information needed to adhere to green principles in the 21st century, and case studies and examples of successful implementation. America Goes Green: An Encyclopedia of Eco-Friendly Culture in the United States examines this gripping topic through 3 volumes organized by A–Z entries across 11 themes; state-by-state essays grouped by region; and references including primary source documents, bibliography, glossary, and green resources. This timely encyclopedia explores the development of an eco-friendly culture in America, and entries present the debates, viewpoints, and challenges of green living.
Biorefinery Production Technologies for Chemicals and Energy
Author: Arindam Kuila
Publisher: John Wiley & Sons
ISBN: 1119591422
Category : Technology & Engineering
Languages : en
Pages : 416
Book Description
This book covers almost all of the diverse aspects of utilizing lignocellulosic biomass for valuable biorefinery product development of chemicals, alternative fuels and energy. The world has shifted towards sustainable development for the generation of energy and industrially valuable chemicals. Biorefinery plays an important role in the integration of conversion process with high-end equipment facilities for the generation of energy, fuels and chemicals. The book is divided into four parts. The first part, "Basic Principles of Biorefinery," covers the concept of biorefinery, its application in industrial bioprocessing, the utilization of biomass for biorefinery application, and its future prospects and economic performance. The second part, "Biorefinery for Production of Chemicals," covers the production of bioactive compounds, gallic acid, C4, C5, and C6 compounds, etc., from a variety of substrates. The third part, "Biorefinery for Production of Alternative Fuel and Energy," covers sustainable production of bioethanol, biodiesel, and biogas from different types of substrates. The last part of this book discusses sequential utilization of wheat straw, material balance, and biorefinery approach. The approaches presented in this book will help readers/users from different areas like process engineering and biochemistry to plan integrated and inventive methods to trim down the expenditure of the industrial manufacture process to accomplish cost-effective feasible products in biorefinery.
Publisher: John Wiley & Sons
ISBN: 1119591422
Category : Technology & Engineering
Languages : en
Pages : 416
Book Description
This book covers almost all of the diverse aspects of utilizing lignocellulosic biomass for valuable biorefinery product development of chemicals, alternative fuels and energy. The world has shifted towards sustainable development for the generation of energy and industrially valuable chemicals. Biorefinery plays an important role in the integration of conversion process with high-end equipment facilities for the generation of energy, fuels and chemicals. The book is divided into four parts. The first part, "Basic Principles of Biorefinery," covers the concept of biorefinery, its application in industrial bioprocessing, the utilization of biomass for biorefinery application, and its future prospects and economic performance. The second part, "Biorefinery for Production of Chemicals," covers the production of bioactive compounds, gallic acid, C4, C5, and C6 compounds, etc., from a variety of substrates. The third part, "Biorefinery for Production of Alternative Fuel and Energy," covers sustainable production of bioethanol, biodiesel, and biogas from different types of substrates. The last part of this book discusses sequential utilization of wheat straw, material balance, and biorefinery approach. The approaches presented in this book will help readers/users from different areas like process engineering and biochemistry to plan integrated and inventive methods to trim down the expenditure of the industrial manufacture process to accomplish cost-effective feasible products in biorefinery.
Sustainable Utilization of Metals
Author: Bernd Friedrich
Publisher: MDPI
ISBN: 3039288857
Category : Technology & Engineering
Languages : en
Pages : 388
Book Description
The high demand for advanced metallic materials raises the need for an extensive recycling of metals and such a sustainable use of raw materials. "Sustainable Utilization of Metals - Processing, Recovery and Recycling" comprises the latest scientific achievements in efficient production of metals and such addresses sustainable resource use as part of the circular economy strategy. This policy drives the present contributions, aiming on the recirculation of EoL-streams such as Waste Electric and Electronic Equipment (WEEE), multi-metal alloys or composite materials back into metal production. This needs a holistic approach, resulting in the maximal avoidance of waste. Considering both aspects, circular economy and material design, recovery and use of minor metals play an essential role, since their importance for technological applications often goes along with a lack of supply on the world market. Additionally, their ignoble character and low concentration in recycling materials cause an insufficient recycling rate of these metals, awarding them the status of “critical metals”. In order to minimize losses and energy consumption, this issue explores concepts for the optimization concerning the interface between mechanical and thermal pre-treatment and metallurgical processes. Such new approaches in material design, structural engineering and substitution are provided in the chapters.
Publisher: MDPI
ISBN: 3039288857
Category : Technology & Engineering
Languages : en
Pages : 388
Book Description
The high demand for advanced metallic materials raises the need for an extensive recycling of metals and such a sustainable use of raw materials. "Sustainable Utilization of Metals - Processing, Recovery and Recycling" comprises the latest scientific achievements in efficient production of metals and such addresses sustainable resource use as part of the circular economy strategy. This policy drives the present contributions, aiming on the recirculation of EoL-streams such as Waste Electric and Electronic Equipment (WEEE), multi-metal alloys or composite materials back into metal production. This needs a holistic approach, resulting in the maximal avoidance of waste. Considering both aspects, circular economy and material design, recovery and use of minor metals play an essential role, since their importance for technological applications often goes along with a lack of supply on the world market. Additionally, their ignoble character and low concentration in recycling materials cause an insufficient recycling rate of these metals, awarding them the status of “critical metals”. In order to minimize losses and energy consumption, this issue explores concepts for the optimization concerning the interface between mechanical and thermal pre-treatment and metallurgical processes. Such new approaches in material design, structural engineering and substitution are provided in the chapters.
Aqueous Pretreatment of Plant Biomass for Biological and Chemical Conversion to Fuels and Chemicals
Author: Charles E. Wyman
Publisher: John Wiley & Sons
ISBN: 0470972025
Category : Science
Languages : en
Pages : 597
Book Description
Plant biomass is attracting increasing attention as a sustainable resource for large-scale production of renewable fuels and chemicals. However, in order to successfully compete with petroleum, it is vital that biomass conversion processes are designed to minimize costs and maximize yields. Advances in pretreatment technology are critical in order to develop high-yielding, cost-competitive routes to renewable fuels and chemicals. Aqueous Pretreatment of Plant Biomass for Biological and Chemical Conversion to Fuels and Chemicals presents a comprehensive overview of the currently available aqueous pretreatment technologies for cellulosic biomass, highlighting the fundamental chemistry and biology of each method, key attributes and limitations, and opportunities for future advances. Topics covered include: • The importance of biomass conversion to fuels • The role of pretreatment in biological and chemical conversion of biomass • Composition and structure of biomass, and recalcitrance to conversion • Fundamentals of biomass pretreatment at low, neutral and high pH • Ionic liquid and organosolv pretreatments to fractionate biomass • Comparative data for application of leading pretreatments and effect of enzyme formulations • Physical and chemical features of pretreated biomass • Economics of pretreatment for biological processing • Methods of analysis and enzymatic conversion of biomass streams • Experimental pretreatment systems from multiwell plates to pilot plant operations This comprehensive reference book provides an authoritative source of information on the pretreatment of cellulosic biomass to aid those experienced in the field to access the most current information on the topic. It will also be invaluable to those entering the growing field of biomass conversion.
Publisher: John Wiley & Sons
ISBN: 0470972025
Category : Science
Languages : en
Pages : 597
Book Description
Plant biomass is attracting increasing attention as a sustainable resource for large-scale production of renewable fuels and chemicals. However, in order to successfully compete with petroleum, it is vital that biomass conversion processes are designed to minimize costs and maximize yields. Advances in pretreatment technology are critical in order to develop high-yielding, cost-competitive routes to renewable fuels and chemicals. Aqueous Pretreatment of Plant Biomass for Biological and Chemical Conversion to Fuels and Chemicals presents a comprehensive overview of the currently available aqueous pretreatment technologies for cellulosic biomass, highlighting the fundamental chemistry and biology of each method, key attributes and limitations, and opportunities for future advances. Topics covered include: • The importance of biomass conversion to fuels • The role of pretreatment in biological and chemical conversion of biomass • Composition and structure of biomass, and recalcitrance to conversion • Fundamentals of biomass pretreatment at low, neutral and high pH • Ionic liquid and organosolv pretreatments to fractionate biomass • Comparative data for application of leading pretreatments and effect of enzyme formulations • Physical and chemical features of pretreated biomass • Economics of pretreatment for biological processing • Methods of analysis and enzymatic conversion of biomass streams • Experimental pretreatment systems from multiwell plates to pilot plant operations This comprehensive reference book provides an authoritative source of information on the pretreatment of cellulosic biomass to aid those experienced in the field to access the most current information on the topic. It will also be invaluable to those entering the growing field of biomass conversion.
Metal Oxide-Based Nanofibers and Their Applications
Author: Vincenzo Esposito
Publisher: Elsevier
ISBN: 0128209070
Category : Technology & Engineering
Languages : en
Pages : 461
Book Description
Metal Oxide-based Nanofibers and their Applications provides an in-depth overview on developments surrounding the synthesis, characterization properties, and applications achieved by scientific leaders in the area. Sections deal with the theoretical and experimental aspects of the synthesis and methodologies to control microstructure, composition and shape of the nanofibrous metal oxides, review the applications of metal oxide nanofibers in diverse technologies, with special focus on the relation between the structural, morphological and compositional features of the nanofibers, cover applications of metal oxide nanofibers in the fields of sensing (biosensing, gas sensing), and consider biomedical and cleaning technologies. Lastly, a final section covers their application in energy generation and storage technologies (e. g. piezoelectric, solar cells, solid oxide fuel cells, lithium-ion batteries, supercapacitors, and hydrogen storage are reviewed. - Reviews electrospinning methods for the synthesis and design of nanocomposites and hybrid metal oxide nanofibers - Discusses applications of metal oxide nanofibers in sensing, biomedical fields, cleaning technologies, and energy - Emphasizes the structural, morphological and compositional properties of nanofibers and their effect on device performance
Publisher: Elsevier
ISBN: 0128209070
Category : Technology & Engineering
Languages : en
Pages : 461
Book Description
Metal Oxide-based Nanofibers and their Applications provides an in-depth overview on developments surrounding the synthesis, characterization properties, and applications achieved by scientific leaders in the area. Sections deal with the theoretical and experimental aspects of the synthesis and methodologies to control microstructure, composition and shape of the nanofibrous metal oxides, review the applications of metal oxide nanofibers in diverse technologies, with special focus on the relation between the structural, morphological and compositional features of the nanofibers, cover applications of metal oxide nanofibers in the fields of sensing (biosensing, gas sensing), and consider biomedical and cleaning technologies. Lastly, a final section covers their application in energy generation and storage technologies (e. g. piezoelectric, solar cells, solid oxide fuel cells, lithium-ion batteries, supercapacitors, and hydrogen storage are reviewed. - Reviews electrospinning methods for the synthesis and design of nanocomposites and hybrid metal oxide nanofibers - Discusses applications of metal oxide nanofibers in sensing, biomedical fields, cleaning technologies, and energy - Emphasizes the structural, morphological and compositional properties of nanofibers and their effect on device performance