Abstract
The power market in China is continuing to open, the energy Internet format is gradually being improved, and the energy storage system is going to become a major key technology that will ...support China’s energy development strategy. All of these developments are taking place against the backdrop of China’s massive investment in the development of new energy. It is one of the effective approaches to handle the problem of grid connection of new energy electrical power generation. This paper investigate and summarizes the typical application scenarios of the system from the three major fields of user side, power grid side, and power generation side, and takes user-side energy storage as an example to build an calculation model, and at the same time verifies it with cases to reflect the practical value. So as to draw the conclusion that the energy storage configuration can effectively regulate the output.
Efficient transport of excitation energy over long distances is a key process in light-harvesting systems, as well as in molecular electronics. However, in synthetic disordered organic materials, the ...exciton diffusion length is typically only around 10 nanometres (refs 4, 5), or about 50 nanometres in exceptional cases, a distance that is largely determined by the probability laws of incoherent exciton hopping. Only for highly ordered organic systems has the transport of excitation energy over macroscopic distances been reported--for example, for triplet excitons in anthracene single crystals at room temperature, as well as along single polydiacetylene chains embedded in their monomer crystalline matrix at cryogenic temperatures (at 10 kelvin, or -263 degrees Celsius). For supramolecular nanostructures, uniaxial long-range transport has not been demonstrated at room temperature. Here we show that individual self-assembled nanofibres with molecular-scale diameter efficiently transport singlet excitons at ambient conditions over more than four micrometres, a distance that is limited only by the fibre length. Our data suggest that this remarkable long-range transport is predominantly coherent. Such coherent long-range transport is achieved by one-dimensional self-assembly of supramolecular building blocks, based on carbonyl-bridged triarylamines, into well defined H-type aggregates (in which individual monomers are aligned cofacially) with substantial electronic interactions. These findings may facilitate the development of organic nanophotonic devices and quantum information technology.
Celotno besedilo
Dostopno za:
DOBA, IJS, IZUM, KILJ, KISLJ, NUK, PILJ, PNG, SAZU, SBMB, SIK, UILJ, UKNU, UL, UM, UPUK
This Intergovernmental Panel on Climate Change Special Report (IPCC-SRREN) assesses the potential role of renewable energy in the mitigation of climate change. It covers the six most important ...renewable energy sources – bioenergy, solar, geothermal, hydropower, ocean and wind energy – as well as their integration into present and future energy systems. It considers the environmental and social consequences associated with the deployment of these technologies and presents strategies to overcome technical as well as non-technical obstacles to their application and diffusion. SRREN brings a broad spectrum of technology-specific experts together with scientists studying energy systems as a whole. Prepared following strict IPCC procedures, it presents an impartial assessment of the current state of knowledge: it is policy relevant but not policy prescriptive. SRREN is an invaluable assessment of the potential role of renewable energy for the mitigation of climate change for policymakers, the private sector and academic researchers.
China has become the world's largest clean energy country in terms of the total installation of wind and photovoltaic power and annual newly installed capacity. However, weather conditions render ...renewable energy unstable, thereby restricting its application to a power grid; reducing the randomness in wind or photovoltaic power is the major challenge of the utilization of solar and wind energy. This paper systematically reviews the explorations and the practices related to wind and photovoltaic power consumption in China. Considering the difference in the methods of supplementing the variable and intermittent output of wind and PV power, five consumption modes are outlined: distributed energy microgrid absorption, power grid peak shaving operation consumption, wind-photovoltaic-storage consumption, wind-photovoltaic-thermal complementation, and wind-photovoltaic-hydro complementation. The theories, features, current situation and growing trends of each mode are analyzed. Finally, several suggestions, including promoting multi-energy complementary microgrid application and installing large-scale pumped storage hydropower, are provided for improving the efficiency of renewable energy development in China.
•Practical variable energy consumption modes are outlined and analyzed.•Small-scale distributed wind and PV power is suitable for microgrid integration.•Medium-sized wind and PV power consumed through the main grid is reasonable.•Large-scale wind and PV can be combined and transmitted with hydro or thermal power.
Sustainable energy development is a complex and global policy objective. What needs to be emphasized to reach the objective, varies based on context corresponding to different energy-related ...challenges. A robust set of context-specific indicators is needed to measure progress towards sustainable energy development. Sustainability indicators enable the monitoring of progress towards policy goals and can inform actions and decision-making. Indicators often reflect the critical issues or challenges that lie ahead. In this study, an iterative stakeholder approach to indicator development is implemented within Iceland. The approach highlights the importance of stakeholder engagement for indicator selection and that indicators need to be context specific. The product of this is a set of indicators for sustainable energy development of the Icelandic energy system. These indicators, based on stakeholder input, reflect national priorities for energy development. Multiple products with policy implications come out of the process; indicators, analysis of stakeholders and their views, a definition of sustainable energy development in the context, a roadmap towards it, and identification of linkages between indicators. Thus, the process can provide a base for energy policy, an action plan towards sustainable energy development that is supported by stakeholders.
•Sustainable energy development is a policy goal that needs robust indicators.•Stakeholder engagement during indicator selection is valuable.•Context-specific indicators are needed as countries face different challenges.•Indicators, based on stakeholder input, reflect national priorities.•The process can provide a base for an energy policy supported by stakeholders.
•Inspecting financial development, economic globalization and technological innovation with consumption and territory-based emissions.•Employed novel dynamic autoregressive distributed lag (ARDL) ...model.•Frequency domain causality is applied for the short-medium and long-run links.•Financial development and economic globalization have a positive effect on the environment.•Technological innovation reduces consumption and territory-based emissions.
In the contemporary world, environmental problems are a major human concern. The status of the environment and its management are prerequisites for every country's sustainable development. Following the Paris Climate Summit (COP21), Pakistan has amplified its efforts to address environmental issues. In this pursuit, this study aims to provide a new perspective by examining the impact of economic globalization, financial development, energy use, economic development and technological innovation with consumption and territory-based emissions from 1990Q1 to 2019Q4 in Pakistan. The study used Dynamic Autoregressive-Distributed Lag (ARDL) simulations and Frequency Domain Causality (FDC) methods. The empirical evidence reveals that financial and economic development stimulate both consumption and territory-based emissions in the short and long run. However, energy use intensifies consumption and territory-based emissions only in the long run. Also, in the short-run economic globalization adversely affects consumption and territory-based emissions while in the long run rises just consumption-based emissions. However, technological innovations decrease both emissions substantially in the long term. Finally, FDC outcomes endorsed the hypothesis. The study suggests that policymakers discourage non-renewables and increase renewable energy use to decrease consumption and territory-based emissions. The results would help Pakistan reach more eco-friendly energy technologies and a more sustainable energy environment to accomplish SDG 7 and 13 goals.
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Realizing decarbonization and sustainable energy supply by the integration of variable renewable energies has become an important direction for energy development. Flow batteries (FBs) are currently ...one of the most promising technologies for large-scale energy storage. This review aims to provide a comprehensive analysis of the state-of-the-art progress in FBs from the new perspectives of technological and environmental sustainability, thus guiding the future development of FB technologies. More importantly, we evaluate the current situation and future development of key materials with key aspects of green economy and decarbonization to promote sustainable development and improve the novel energy framework. Finally, we present an analysis of the current challenges and prospects on how to effectively construct low-carbon and sustainable FB materials in the future.
A comprehensive analysis of flow battery technologies from the aspect of sustainable chemistry is provided and 9 principles have been proposed to evaluate a flow battery's technical and environmental sustainability.
With the development of information technology and its innovative applications in the field of environmental protection, the role of the internet in energy conservation and emission reduction has ...become increasingly prominent. Based on panel data from 30 provinces from 2006 to 2017 and 196 cities from 2011 to 2018 in China, this study utilizes the SBM (Slack-Based Measure) model to evaluate energy saving and emission reduction efficiency. The OLS, Spatial Durbin model, threshold model, mediating effect model, and DID (Difference in Difference) model are employed to study the direct effect, spatial spillover effect, nonlinear relationship, transmission mechanism, and policy effect of internet development on energy saving and emission reduction efficiency. The empirical results indicate that internet development has significantly promoted energy saving and emission reduction efficiency. This conclusion still holds after a series of robustness tests, including IV estimation, and the substitution of dependent and independent variables. The gradual DID model based on the quasi natural experiment of “Broadband China” further proves the causal relationship between internet development and energy saving and emission reduction efficiency. Internet development can improve the latter through technological progress, energy structure, human capital, and openness. Interestingly, the impact of internet development on the energy saving and emission reduction efficiency of adjacent areas also has a significantly positive spatial spillover effect, which still exists under the spatial weight matrix of different distances. There is also solid evidence that the impact of internet development on energy saving and emission reduction efficiency is non-linear under different levels of technological progress, energy structure, human capital, and openness.
•Energy-saving and emission reduction of the 30 provinces and 196 cities in China are estimated.•The influence of internet on energy saving and emission reduction is investigated.•A Space-Durbin model that addresses potential spatial spillover factors is employed.•Internet development has significant effects on energy saving and emission reduction.•Technological progress, energy structure, human capital and openness are helpful to energy-saving.
Developing renewable energy is a crucial measure in addressing climate change and achieving carbon reduction. However, research evidence on its impact is mixed. To fill this gap, we construct a panel ...quantile regression model in this study to examine whether China's renewable energy development has effectively promoted a reduction in carbon emissions using panel data of 30 Chinese provinces from 2005 to 2016. The results show that: (1) Improving China's renewable energy development level is conducive to carbon emission reductions. Specifically, carbon intensity could drop by 0.084%–0.149% for every 1% increase in renewable energy generation. However, the inhibitory effect is limited due to trapped electricity as well as the fact that substituting renewable energy for fossil energy has not yet sufficiently transformed the energy consumption structure. (2) Renewable energy development has a greater impact on carbon intensity reduction in regions with high or low carbon intensity than in areas with intermediate carbon intensity. (3) The main factor in the decline in carbon intensity in China is a decrease in energy intensity. Nonetheless, the role of renewable energy in carbon reduction has increased over time.
•Role of renewable energy development on carbon reduction is examined.•China's renewable energy development has limited effect on its carbon reduction.•Reduction effect is the minimal in areas with intermediate carbon intensity.•Reduction effect of renewable energy becomes more and more obvious with time.
Fusion and the Holy Grail Abbey, Tristan
New Atlantis (Washington, D.C.),
04/2023
72
Journal Article, Magazine Article
In Indiana Jones and the Last Crusade, our hero dismisses the archaeological quest for Christ’s cup from the Last Supper as merely “an old man’s dream.” It is fitting, therefore, that among all the ...various energy technologies competing for the “Holy Grail” moniker, fusion power has now been sought for over a hundred years without much success. There has been some success, as we shall see below. We’ve come a long way; we just don’t know how far we have left to go, because — if you listen to the theoreticians and experimentalists behind the latest headlines — we don’t really know where we’re going. Let’s just assume we master all the technological challenges and make all the necessary investments in the public or private sectors. The point of this essay is not to provide an exhaustive history of the quest, nor to examine the technical path to deployment. Far abler chroniclers with deeper expertise are out there. The objective here is more limited: to pull, ever so gently, on the thread of fusion regulation and its relationship with nuclear security.
Celotno besedilo
Dostopno za:
BFBNIB, DOBA, IZUM, KILJ, NMLJ, NUK, PILJ, PNG, SAZU, UILJ, UKNU, UL, UM, UPUK
