Angebote zu "Systems" (12 Treffer)

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Theoretical Investigation of Light Emission fro...
36,90 € *
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Amorphous silicon is generally considered unsuitable for light emitting applications because of the indirect nature of its bandgap. Many efforts have been devoted towards the research of different systems compatible with a-Si technology and able to act as light emitters, among these are low-dimensional amorphous silicon structures. In these structures, it has been shown that, zero- phonon optical transitions are allowed and oscillator strength of the zero- phonon transition is significantly enhanced . Therefore, it is expected, the light emission properties will be improved. The aim of this study is to develop a photoluminescence a-SiQDs model, where its radiative recombination occurs at room temperature. This model is suggested, for the first time, both the effect of concepts, spatial and quantum confinements. This study may be able to show the differences between them. In fact, these concepts will be used to see the possibility for shifting the luminescence spectrum of a-SiQDs into visible region. The tuning the visible light by controlling the size of QDs also is taken into account.

Anbieter: Dodax
Stand: 12.07.2020
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Enhancing the quality of ground coupled heat pumps
61,90 € *
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State of the art heating systems for buildings, though efficient in terms of energy, waste exergy and emit CO2. To overcome these issues, besides having an architecture that ensures symmetry of radiation and a low temperature heating emission system, a Heat Pump (HP) with the "right" heat source needs to be present. The supplied heat's quality will draw the line between a normal and a Low-Exergy and Zero Emission system. In this thesis, a new deep Coaxial Borehole Heat Exchanger (CBHE), without grout (BHE's back-filling material), with an insulated axial pipe and counter-flow regeneration was "brought to reality". Though only the theoretical aspects and simulation results are included here, it is worth mentioning that it is now commercially available.

Anbieter: Dodax
Stand: 12.07.2020
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Mathematical Modeling and Analysis of Methane P...
54,90 € *
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This book presents a systematic study of methane production and oxidation processes in anoxic soils, using mathematical modelling tools and dynamical systems theory. Methane is a greenhouse gas and the second largest contributor to global warming among anthropogenic greenhouse gases. Methane emission from soil ecosystems is basically regulated by two opposing microbial processes: methane production and methane oxidation. Main topic of the book includes quantification and quantitative analyses of the soil microbial communities and associated biogeochemical processes that release soil carbon as methane gas to the atmosphere. It demonstrates and quantifies different dynamic regimes for a variety of long-term behaviors of methane emissions. It also discusses the roles of potential process-controlling factors and its spatiotemporal variability. Consequently, this study illustrates a "zero-emission" technique to force the emission towards 'zero' at long-term.

Anbieter: Dodax
Stand: 12.07.2020
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Towards efficient hydrogen production via water...
79,00 € *
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The necessity to reduce green house gas emission and growing difficulties in fossil fuel recovery raise great challenges for the scientific community to develop efficient, low cost alternative energy sources. Hydrogen is sought by many as a way to store and transport energy produced from renewable sources. As a fuel hydrogen produces only water on burning and is not toxic in any way. Photolytic processes are very attractive for hydrogen production due to the zero greenhouse gas emissions, however, they can be commercially used only if limitations related to low efficiency and poor stability can be resolved. In this work we describe a novel cell structure for stable photo electrochemical water splitting that can be prepared by electrodeposition from ionic liquids at high temperature. The deposition methods developed here provide low cost and efficient way to synthesise high quality semiconductors and their alloys. The concept presented in this work can potentially be applied to a variety of efficient, yet unstable systems to achieve efficient and long lasting water splitting.

Anbieter: Dodax
Stand: 12.07.2020
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Sustainable Building and Climate Change
49,00 € *
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The book discusses the aspects of energy use in buildings, several energy conservation opportunities in the existing buildings, use of renewable energy systems, use of passive solar heating and cooling techniques, bio-climatic buildings, green buildings and zero-emission buildings so as to conserve electricity. The effort being undertaken by various State Government and the Central Government under the National Action Plan on Climate Change may go a long way in providing sustainable habitat to fight the menace of climate change.

Anbieter: Dodax
Stand: 12.07.2020
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Grid Integration of Electric Mobility
178,56 € *
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The UN Climate Change Conference in Paris, with its key topics of global warming and deteriorating air quality, will speed up the advance of electric mobility. CO2-neutral and zero-emission mobility require electricity to be generated from regenerative sources of energy. Power generation from wind and solar energy, however is dependent on the weather and is therefore not stable. The irregularities that occur in nature can result in unacceptable voltage fluctuations in the power grid. For that reason, the availability of highly flexible loads and storage systems is becoming particularly important. Electric vehicles, with their grid-relevant properties as controllable power consumers and electricity storage systems, could help to stabilize future power grids.

Anbieter: Dodax
Stand: 12.07.2020
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Catalysis to produce hydrogen
130,00 CHF *
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The share market of hydrogen is increasing with the implementation of fuel cell systems and the growing demand for zero-emission fuels. Hydrogen production by using metal catalyst will need to increase with this growing market. However, some carbon is deposited on the catalyst but there was a window of operation where the deposited carbon did not have too great an effect on hydrogen production under different conditions. Carbon formation deactivates the catalyst, resulting in short life cycles. In order to improve process performance, in particular minimizing catalyst deactivation caused by carbon formation and maximizing the yield of hydrogen product, the addition of the promoters to catalyst is the most familiar method. The book is focused on the art of the promoters application on metal catalyst for hydrogen production from the methane steam reforming process at high pressure and the steam iron process over promoted Fe-oxide based catalyst.

Anbieter: Orell Fuessli CH
Stand: 12.07.2020
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Hydrogen Storage Technology
259,00 CHF *
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Zero-carbon, hydrogen-based power technology offers the most promising long-term solution for a secure and sustainable energy infrastructure. With contributions from the world's leading technical experts in the field, Hydrogen Storage Technology: Materials and Applications presents a broad yet unified account of the various materials science, physics, and engineering aspects involved in storing hydrogen gas so that it can be used to provide power. The book helps you understand advanced hydrogen storage materials and how to build systems around them. Accessible to nonscientists, the first chapter explains how a hydrogen-based energy carrier and storage infrastructure is required to address fuel resource and political insecurities as well as global climate change. The second chapter describes high-efficiency hydrogen conversion devices, including internal combustion engines and fuel cells, for producing power and electricity. The book then dives into the state of the art in hydrogen storage technology. It covers recent hydrogen storage materials research and hydrogen storage methods, with an emphasis on solid-state techniques. It also reviews codes and standards and explores engineering approaches for creating zero-emission, hydrogen-fueled power systems. Collecting recent results from around the globe, this book gets you up to date on the latest hydrogen-based technology for mitigating energy and environmental risks. It provides a deep science and engineering-based description of hydrogen storage materials and clearly explains how the materials are engineered for zero-emission, carbon-free power systems.

Anbieter: Orell Fuessli CH
Stand: 12.07.2020
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Catalysis to produce hydrogen
69,99 € *
ggf. zzgl. Versand

The share market of hydrogen is increasing with the implementation of fuel cell systems and the growing demand for zero-emission fuels. Hydrogen production by using metal catalyst will need to increase with this growing market. However, some carbon is deposited on the catalyst but there was a window of operation where the deposited carbon did not have too great an effect on hydrogen production under different conditions. Carbon formation deactivates the catalyst, resulting in short life cycles. In order to improve process performance, in particular minimizing catalyst deactivation caused by carbon formation and maximizing the yield of hydrogen product, the addition of the promoters to catalyst is the most familiar method. The book is focused on the art of the promoters application on metal catalyst for hydrogen production from the methane steam reforming process at high pressure and the steam iron process over promoted Fe-oxide based catalyst.

Anbieter: Thalia AT
Stand: 12.07.2020
Zum Angebot