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Renewable Energy:Wind Turbines,Solar Cells,Small Hydroelectric Plants,Biomass,and Geothermal Sources of Energy 预览
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作者 Natasa A. Kablar 《能源与动力工程:英文版》 2019年第4期162-172,共11页
In this paper,we present five basic types of renewable energy sources,namely:wind turbines,solar cells,small hydroelectric plants,biomass,and geothermal sources of energy.Wind turbines transform energy of wind into el... In this paper,we present five basic types of renewable energy sources,namely:wind turbines,solar cells,small hydroelectric plants,biomass,and geothermal sources of energy.Wind turbines transform energy of wind into electrical energy,solar cells transform energy of sun into electric energy,hydroelectric plants transform energy of water into electric energy,devices or machines can be constructed to transform energy of biomass into heat energy,and geothermal energy into some form of energy.In this paper we present basic information and reasons why there is need today to use these forms of energy—called green energies,we present how these devices or machines function,and we propose for future work design of typical devices or machines that will satisfy basic functional needs. 展开更多
关键词 Wind ENERGY solar ENERGY water ENERGY BIOMASS ENERGY GEOTHERMAL ENERGY RENEWABLE ENERGIES electrical power generation of electricity
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苏州某大型综合医院建筑能耗分析与节能探讨 预览
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作者 林然 《建筑节能》 CAS 2019年第2期57-59,63共4页
对苏州市某大型综合性医院2014-2016年的能源消费情况进行了统计分析,医院的能源形式包含了电力、天然气、市政蒸汽,其中电力和市政蒸汽共占到医院总能耗量的97.20%,医院用能处于苏州同类型综合医院的中等水平,同时对本医院后期的节能... 对苏州市某大型综合性医院2014-2016年的能源消费情况进行了统计分析,医院的能源形式包含了电力、天然气、市政蒸汽,其中电力和市政蒸汽共占到医院总能耗量的97.20%,医院用能处于苏州同类型综合医院的中等水平,同时对本医院后期的节能策略进行了探讨,以期为当地医院类建筑节能提供参考。 展开更多
关键词 综合性医院 能源 用能水平 节能策略
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基于SEEMP的船舶营运能效评价指数的开发及应用:韩国某案例研究 预览
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作者 Nam-kyun IM Bora Choe Chung-Hwan Park 《船舶与海洋工程学报:英文版》 CSCD 2019年第2期185-194,共10页
The CO2 emission reduction policy of the International Maritime Organization(IMO)recommends that the operation of ships,managed by maritime transport companies,should be energy-efficient.An evaluation method that can ... The CO2 emission reduction policy of the International Maritime Organization(IMO)recommends that the operation of ships,managed by maritime transport companies,should be energy-efficient.An evaluation method that can determine how successfully a ship implements the energy efficiency plan is proposed in this study.To develop this method,the measures required for energy-efficient ship operations according to the Ship Energy Efficiency Management Plan(SEEMP)operational guidelines were selected.The weights of the selected measures,which indicate how they contribute to the energy-efficient operation of a ship,were derived using a survey based on the analytic hierarchy process(AHP)method.Consequently,using these measures and their weights,a new evaluation method was proposed.This evaluation method was applied to shipping companies in South Korea,and their ship operation energy efficiency indices were derived and compared.This evaluation method will be useful to the government and shipping companies in assessing the energy efficiency of ship operations. 展开更多
关键词 SHIP GREENHOUSE gas SHIP ENERGY EFFICIENCY Management Plan ENERGY EFFICIENCY Operational Indicator ENERGY EFFICIENCY Design Index
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Decentralized Control for Residential Energy Management of a Smart Users’ Microgrid with Renewable Energy Exchange 预览
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作者 Raffaele Carli Mariagrazia Dotoli 《自动化学报:英文版》 CSCD 2019年第3期641-656,共16页
This paper presents a decentralized control strategy for the scheduling of electrical energy activities of a microgrid composed of smart homes connected to a distributor and exchanging renewable energy produced by ind... This paper presents a decentralized control strategy for the scheduling of electrical energy activities of a microgrid composed of smart homes connected to a distributor and exchanging renewable energy produced by individually owned distributed energy resources. The scheduling problem is stated and solved with the aim of reducing the overall energy supply from the grid, by allowing users to exchange the surplus renewable energy and by optimally planning users’ controllable loads. We assume that each smart home can both buy/sell energy from/to the grid taking into account time-varying non-linear pricing signals. Simultaneously, smart homes cooperate and may buy/sell locally harvested renewable energy from/to other smart homes. The resulting optimization problem is formulated as a non-convex non-linear programming problem with a coupling of decision variables in the constraints. The proposed solution is based on a novel heuristic iterative decentralized scheme algorithm that suitably extends the Alternating Direction Method of Multipliers to a non-convex and decentralized setting. We discuss the conditions that guarantee the convergence of the presented algorithm. Finally, the application of the proposed technique to a case study under several scenarios shows its effectiveness. 展开更多
关键词 Alternating direction method of multipliers decentralized control ENERGY MANAGEMENT MICROGRID non-convex optimization RENEWABLE ENERGY RESIDENTIAL ENERGY MANAGEMENT SMART homes
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Basic characteristics of nuclear landscape by improved Weizs-cker-Skyrmetype nuclear mass model
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作者 马娜娜 张海飞 +1 位作者 包小军 张鸿飞 《中国物理C:英文版》 SCIE CAS CSCD 2019年第4期114-129,共16页
Atomic Mass Evaluation(AME2016) has replenished the latest nuclear binding energy data. Other physical observables, such as the separated energies, decay energies, and the pairing gaps, were evaluated based on the new... Atomic Mass Evaluation(AME2016) has replenished the latest nuclear binding energy data. Other physical observables, such as the separated energies, decay energies, and the pairing gaps, were evaluated based on the new mass table. An improved Weizs?cker-Skyrme-type(WS-type) nuclear mass model with only 13 parameters was presented, including the correction from two combinatorial radial basis functions(RBFs), where shell and pairing effects are simultaneously dealt with using a Strutinsky-like method. The RBFs code had 2267 updated experimental binding energies as inputs, and their correspondent root-mean square(rms) deviations dropped to 149 keV. For the training of other mass models by RBFs correction, rms deviations are clustered between 100 keV to 200 keV. Compared with other experimental quantities, the rms deviations calculated within the improved WS-type model falls between 100 keV and 250 keV. We extrapolate the binding energies to 12435 nuclei, which covers the ranges 8 ≤ Z ≤ 128 and 8 ≤ N ≤ 251 in the framework of the WS-type model with RBFs correction. Simultaneously, the ground state deformations β2,4,6 and all parts in the WS-type mass formula are presented in this paper. Finally, we tabulated all calculated characteristics within the improved formula and linked them to https://github.com/lukeronger/Nuclear Data-LZU: nuclear binding energies, one-nucleon and two-nucleon separation energies(Sn,p,2n,2p), and β-decay energies( Qα and Qβ-,β+,EC), and the pairing gap △n and △p. 展开更多
关键词 mass model RADIAL basis functions binding ENERGY SEPARATED ENERGY DECAY ENERGY PAIRING gap
Energy loss of degrader in SC200 proton therapy facility 预览
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作者 Feng Jiang Yun-Tao Song +4 位作者 Jin-Xing Zheng Xian-Hu Zeng Peng-Yu Wang Jun-Sheng Zhang Wu-Quan Zhang 《核技术:英文版》 SCIE CAS CSCD 2019年第1期11-18,共8页
The proton beam energy determines the range of particles and thus where the dose is deposited. According to the depth of tumors, an energy degrader is needed to modulate the proton beam energy in proton therapy facili... The proton beam energy determines the range of particles and thus where the dose is deposited. According to the depth of tumors, an energy degrader is needed to modulate the proton beam energy in proton therapy facilities based on cyclotrons, because the energy of beam extracted from the cyclotron is fixed. The energy loss was simulated for the graphite degrader used in the beamline at the superconducting cyclotron of 200 MeV in Hefei(SC200). After adjusting the mean excitation energy of the graphite used in the degrader to 76 eV, we observed an accurate match between the simulations and measurements.We also simulated the energy spread of the degraded beam and the transmission of the degrader using theoretical formulae. The results agree well with the Monte Carlo simulation. 展开更多
关键词 Degrader ENERGY LOSS Mean EXCITATION ENERGY ENERGY SPREAD Transmission
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Energy-saving operation approaches for urban rail transit systems
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作者 Ziyou GAO Lixing YANG 《工程管理前沿:英文版》 2019年第2期139-151,共13页
With the accelerated urbanization in China, passenger demand has dramatically increased in large cities, and traffic congestion has become serious in recent years. Developing public urban rail transit systems is an in... With the accelerated urbanization in China, passenger demand has dramatically increased in large cities, and traffic congestion has become serious in recent years. Developing public urban rail transit systems is an indispensable approach to overcome these problems. However, the high energy consumption of daily operations is an emerging issue due to increased rail transit networks and passenger demands. Thus, reducing the energy consumption and operational cost by using advanced optimization methodologies is an urgent task for operation managers. This work systematically introduces energysaving approaches for urban rail transit systems in three aspects, namely, train speed profile optimization, utilization of regenerative energy, and integrated optimization of train timetable and speed profile. Future research directions in this field are also proposed to meet increasing passenger demands and network?based urban rail transit systems. 展开更多
关键词 urban rail TRANSIT ENERGY SAVING speed profile optimization REGENERATIVE ENERGY TRAIN TIMETABLE
从孤立到开放——系统生态学视野下现代建筑能量实践反思
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作者 郑斐 刘甦 王月涛 《新建筑》 2019年第1期66-71,共6页
在系统生态学视野下,从科学、技术和文化方面探讨了现代建筑能量实践中孤立系统观的三大历史成因:以基于热传导的热力学研究为初始因,以源于冷藏工业的绝热技术发展为扩散因,以节约的道德观念为持续因;从孤立到开放,明确了建筑能量系统... 在系统生态学视野下,从科学、技术和文化方面探讨了现代建筑能量实践中孤立系统观的三大历史成因:以基于热传导的热力学研究为初始因,以源于冷藏工业的绝热技术发展为扩散因,以节约的道德观念为持续因;从孤立到开放,明确了建筑能量系统时空中的开放耗散结构特征;并结合系统生态学理论和能值分析方法,探讨了一种开放的建筑能量系统的分析和评价方法。所有这些将为未来生态、系统和高效的绿色建筑设计和实践提供理论与方法支持,对绿色建筑的教育和发展具有借鉴意义。 展开更多
关键词 系统生态学 能量 能值分析 现代建筑 系统论 绿色建筑
Low-temperature plasma technology for electrocatalysis
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作者 Dongdong Wang Yuqin Zou +5 位作者 Li Tao Yiqiong Zhang Zhijuan Liu Shiqian Du Shuangquan Zang Shuangyin Wang 《中国化学快报:英文版》 SCIE CAS CSCD 2019年第4期826-838,共13页
Electrochemical reactions were widely used in energy storage and conversion devices. The development of low-cost, highly efficient and stable electrocatalyst is essential to a large-scale application of energy storage... Electrochemical reactions were widely used in energy storage and conversion devices. The development of low-cost, highly efficient and stable electrocatalyst is essential to a large-scale application of energy storage and conversion devices. Recently, emerging plasma technology has been employed as one of the practical ways to synthesize and modify electrocatalysts due to its unique property. In this review, we summarized the latest applications of plasma in energy storage and conversion, including using it as the preparation and modification technology of the various electrocatalysts and the usage of it as the synthesis technology directly. Firstly, we presented the definition and types of plasma reactors and their respective characteristics. Then, these applications of plasma technology in many essential electrode reactions including carbon dioxide reduction reaction (CO2RR), nitrogen fixation, oxygen reduction reaction (ORR), oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) were introduced. Finally, the challenges and outlook of plasma technology in energy storage and conversion were summarized, and the solutions and prospected its development in the future were present. Through reviewing the related aspects, readers can have a deeper understanding of the application prospects of plasma in electrocatalysis. 展开更多
关键词 Plasma ELECTROCATALYSTS ELECTRODE REACTIONS ENERGY storage ENERGY conversion
中国参与全球能源治理的总体思路与路径选择
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作者 王礼茂 屈秋实 +2 位作者 牟初夫 方叶兵 熊琛然 《资源科学》 CSSCI CSCD 北大核心 2019年第5期825-833,共9页
全球缺乏权威、统一和协调的能源治理机构,治理架构一直处于碎片化状态。国际能源署(IEA)和石油输出国组织(OPEC)是当前最有影响力的全球能源治理机构,分别代表能源消费国和能源出口国,各自存在明显的缺陷;国际能源论坛(IEF)虽然为能源... 全球缺乏权威、统一和协调的能源治理机构,治理架构一直处于碎片化状态。国际能源署(IEA)和石油输出国组织(OPEC)是当前最有影响力的全球能源治理机构,分别代表能源消费国和能源出口国,各自存在明显的缺陷;国际能源论坛(IEF)虽然为能源生产国和消费国搭建了交流平台,但仅限于对话机制,缺乏相应的组织架构和约束机制;能源宪章条约(ECT)早期主要局限于欧洲,且缺乏生产大国和消费大国的参与;而7国集团(G7)和20国集团(G20)等更多的是高层协调作用,缺乏现实操作性。中国如何在当前的全球能源治理架构下发挥作用、参与治理?本文提出以转型后的能源宪章条约,即国际能源宪章条约(IECT)为基础,以“一带一路”为依托,以能源互联网为切入点,通过参与-加入-改造-重塑的路径,发挥中国能源消费大国的作用,完善全球能源治理体系,最终实现更加公平合理的全球能源治理体系。 展开更多
关键词 能源 全球治理 总体思路 路径选择 国际能源宪章条约 一带一路
能源和矿产资源资产负债表编制及应用探讨 预览
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作者 耿建新 吕晓敏 +1 位作者 石吉金 刘尚睿 《中国国土资源经济》 2019年第2期4-14,共11页
环境承载能力的限制和能源矿产资源储量的约束,使得良好有效的能源管理和环境治理手段的重要性愈发凸显。联合国和澳大利亚实施的环境经济核算体系(SEEA,AEEA)能清晰地分析一国或一个地区能源矿产资源的“来龙去脉”,并通过“供给=使用... 环境承载能力的限制和能源矿产资源储量的约束,使得良好有效的能源管理和环境治理手段的重要性愈发凸显。联合国和澳大利亚实施的环境经济核算体系(SEEA,AEEA)能清晰地分析一国或一个地区能源矿产资源的“来龙去脉”,并通过“供给=使用”的平衡关系展现国家现有能源矿产资源管理的重点及后续发展应关注的焦点。为此,我国也应在联合国和澳大利亚实践的基础之上,编制完整、全面的能源矿产资源资产负债表,既包括流量和存量表,又包括实物量和价值量表,同时以复式表格为核心,辅之以单式表格,以完善我国能源管理和环境治理路径。 展开更多
关键词 能源 矿产资源 资产负债表 环境经济核算体系 能源管理 环境治理
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摩洛哥大西洋沿岸的波能评估 预览
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作者 Hafsa Bouhrim Abdellatif El Marjani 《船舶与海洋工程学报:英文版》 CSCD 2019年第2期142-152,共11页
The aim of the present work is to assess the offshore wave energy potential along the Atlantic coast of Morocco.Research works of this paper focus on the identification of the most energetic sites for wave energy conv... The aim of the present work is to assess the offshore wave energy potential along the Atlantic coast of Morocco.Research works of this paper focus on the identification of the most energetic sites for wave energy converters(WECs)deployment.For this purpose,11 sites have been explored;all of them are located at more than 40m depth on the Moroccan Atlantic coast.The wave power at each site is computed on the basis of wave data records in terms of significant wave height and energy period provided by theWaveWatch three(WW3)model.Results indicate that the coast sites located between latitudes 30°30′N and 33°N are the most energetic with an annual average wave power estimated at about 30 kW?m^-1,whereas,in the other sites,the wave power is significantly lower.Moreover,the study of the monthly and seasonal temporal variability is found to be uniform in the powerful sites with values four times greater in winter than in summer.The directional investigation on the significant wave height has shown that for almost all the powerful sites,the incoming waves have a dominant sector ranging between Northern(N)and Western-Northern-Western(WNW)directions. 展开更多
关键词 WAVE ENERGY MOROCCAN ATLANTIC coast WAVE ENERGY converter(WEC) WAVE Watch 3(WW3) Seasonal and temporal variability Directional WAVE height investigation Power ROSES Occurrence BIVARIATE distributions
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基于Star-CCM+的摆式波浪能装置水动力性能研究 预览
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作者 Zheng Yuan Liang Zhang +2 位作者 Binzhen Zhou Peng Jin Xiongbo Zheng 《船舶与海洋工程学报:英文版》 CSCD 2019年第2期153-159,共7页
A two-dimensional numerical Computational Fluid Dynamics(CFD)model is established on the basis of viscous CFD theory to investigate the motion response and power absorption performance of a bottom-hinged flap-type wav... A two-dimensional numerical Computational Fluid Dynamics(CFD)model is established on the basis of viscous CFD theory to investigate the motion response and power absorption performance of a bottom-hinged flap-type wave energy converter(WEC)under regular wave conditions.The convergence study of mesh size and time step is performed to ensure that wave height and motion response are sufficiently accurate.Wave height results reveal that the attenuation of wave height along the wave tank is less than 5%only if the suitable mesh size and time step are selected.The model proposed in this work is verified against published experimental and numerical models.The effects of mechanical damping,wave height,wave frequency,and water depth on the motion response,power generation,and energy conversion efficiency of the flap-type WEC are investigated.The selection of the appropriate mechanical damping of the WEC is crucial for the optimal extraction of wave power.The optimal mechanical damping can be readily predicted by using potential flow theory.It can then be verified by applying CFD numerical results.In addition,the motion response and the energy conversion efficiency of the WEC decrease as the incident wave height increases because the strengthened nonlinear effect of waves intensifies energy loss.Moreover,the energy conversion efficiency of theWEC decreases with increasing water depth and remains constant as the water depth reaches a critical value.Therefore,the selection of the optimal parameters during the design process is necessary to ensure that the WEC exhibits the maximum energy conversion efficiency. 展开更多
关键词 WAVE ENERGY CONVERTER Oyster.Energy conversion efficiency OptimumPTO DAMPING Nonlinear REGULAR WAVE
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Beyond the Audit: Making Efficiency Easy and Enticing by Addressing Project Procurement 预览
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作者 Genaro Bugarin Laurel Rothschild +1 位作者 Rupal Bain Alex Ricklefs 《土木工程与建筑:英文版》 2019年第5期283-292,共10页
Many states have implemented an Energy Efficiency Resource Standard (EERS) or target to curtail greenhouse gas (GHG) emissions. California alone has set a target of doubling energy efficiency savings in existing build... Many states have implemented an Energy Efficiency Resource Standard (EERS) or target to curtail greenhouse gas (GHG) emissions. California alone has set a target of doubling energy efficiency savings in existing buildings by 2030. As more states rely on energy efficiency to reduce GHG emissions, programs designed to support the planning and implementation of energy efficiency projects will become more important. Identifying energy efficiency projects has traditionally been the focus of these programs, however delivering savings remains a key challenge. Strategies to address procurement are often overlooked as program resources focus more on technical resources, such as audits and monetary incentives. Then once identified, specialized energy efficiency projects are often folded in with standard maintenance or capital improvement projects, putting them at risk of compromising the expected performance. This paper focuses on procurement as a key component of program implementation and success and outlines key issues and challenges specifically faced by the public sector. Furthermore, the paper shares a procurement strategy implemented through the Southern California Regional Energy Network (SoCalREN) Public Agency Program that addresses these problems in order to assure intended project performance. The strategy includes engaging procurement stakeholders early in the project process, exploring the different types of procurement pathways and following an implementation checklist to enhance project success. With this systematic approach to procurement, there will be fewer barriers and energy efficiency will be easy and enticing, which will further enable states to achieve their GHG emission reduction targets. 展开更多
关键词 Public procurement ENERGY EFFICIENCY project delivery ENERGY PROJECTS procurement method options.
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Comprehensive geochemical/hydrochemical and geo-thermometry analysis of Unai geothermal field,Gujarat,India
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作者 Manan Shah Anirbid Sircar +3 位作者 Nahid Shaikh Karan Patel Darshan Sharma Dwijen Vaidya 《中国地球化学学报:英文版》 EI CAS CSCD 2019年第1期145-158,共14页
The knowledge of water temperature produced from a geothermal reservoir and its composition is of utmost importance in designing utilization strategies,the surface production facilities and in selecting the material t... The knowledge of water temperature produced from a geothermal reservoir and its composition is of utmost importance in designing utilization strategies,the surface production facilities and in selecting the material to be used.Unai hot springs are located in the southern part of Gujarat,India with discharge temperatures varying from 51 to 56℃.With the aim of developing Unai as a potential geothermal field and exploiting it in the future,geochemical and geothermometrical study was undertaken.The samples were collected from various Unai geothermal location and analysis of chemical composition of water obtained from different wells was done.The concentration of Silica,carbonate and ions like Na and C1 have been analyzed to delineate the path of water movement in the subsurface and classify the reservoir based on the enthalpy.The ratio of the concentration of ions like Na+ and K+ and the relative proportions of various sets of ions were also used to characterize the geothermal reservoir and the reservoir fluid by the use of ternary diagrams.Na-K-Ca,Chalcedony,quartz,and Silica geo-thermometers have been studied.The present study also envisages the importance of graphical representations like Piper diagram,Scholler etc.to determine variation in hydrochemical facies and to understand the evolution of hydrochemical processes in the Unai geothermal field respectively.The study yields the conclusion that the reservoir under consideration is a low enthalpy reservoir with temperature ranging from 60 to 80 ℃. 展开更多
关键词 GEOTHERMAL ENERGY Hydrochemical GEOCHEMICAL Geothermometery RENEWABLE ENERGY
Effects of Various Deformation on the First Fission Barrier in Even-A N = 152 Isotones
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作者 柴清祯 赵维娟 王华磊 《理论物理通讯:英文版》 SCIE CAS CSCD 2019年第1期67-74,共8页
The first(namely, inner) fission barriers for even-A N = 152 nuclei have been studied systematically in the framework of macroscopic-microscopic model by means of potential energy surface(PES) calculations in the thre... The first(namely, inner) fission barriers for even-A N = 152 nuclei have been studied systematically in the framework of macroscopic-microscopic model by means of potential energy surface(PES) calculations in the threedimensional(β2, γ, β4) deformation space. Their collective properties, such as ground-state deformations, are compared with previous calculations and available observations, showing a consistent trend. In addition, it has been found that the microscopic shell correction energy plays an important role on surviving fission in these N = 152 deformed shell nuclei. The inclusion of non-axial symmetric degree of freedom γ will pull the fission barrier down more significantly with respect to the calculation involving in hexadecapole deformation β4. Furthermore, the calculated Woods-Saxon(WS) single particle levels indicate that the large microscopic shell correction energies due to low level densities may be responsible for such a reduction on the inner fission barrier. 展开更多
关键词 FISSION barriers potential ENERGY surface calculations GROUND-STATE deformations shell CORRECTION ENERGY single particle levels
An energy efficiency evaluation method for parallel robots based on the kinetic energy change rate
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作者 LIU XinJun BI WeiYao XIE FuGui 《中国科学:技术科学英文版》 SCIE EI CAS CSCD 2019年第6期1035-1044,共10页
Benefit from the high payload-to-weight ratio, parallel robots are expected to have a high potential for energy savings. However,it is a challenging issue to evaluate the energy efficiency of parallel robots with a qu... Benefit from the high payload-to-weight ratio, parallel robots are expected to have a high potential for energy savings. However,it is a challenging issue to evaluate the energy efficiency of parallel robots with a quantitative method. Quantitative energy efficiency evaluation methods include energy efficiency evaluation models and indices which mathematically describe the relationship between energy consumers in models and design variables of robots, such as geometry, mass and inertia parameters.Considering the structural features of parallel robots, the chains and the end effectors are identified as two separated energy consumers. Besides, the chains in parallel robots are identified as a transmission system which transfers energy from drives to the end effectors. On this basis, an energy efficiency evaluation model considering the change rate of kinetic energy stored in chains is built. The kinetic energy change rate of chains is influenced by design variables of robots as well as motion of the end effector.In order to give a quantitative description of energy efficiency performance of parallel robots, indices considering arbitrary velocity vector of the end effector are proposed. The evaluation method is suitable for all kinds of parallel robots with various motion conditions. Furthermore, the method can be used to optimize machining parameters and guide the design of energyefficient machines. 展开更多
关键词 ENERGY EFFICIENCY evaluation PARALLEL ROBOTS KINETIC ENERGY power TRANSMISSION
Design and Operational Strategy Research for Temperature Control Systems of Isothermal Compressed Air Energy Storage Power Plants
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作者 FU Hao JIANG Tong +1 位作者 CUI Yan LI Bin 《热科学学报:英文版》 SCIE EI CAS CSCD 2019年第2期204-217,共14页
Energy storage technology is critical for intelligent power grids. It has great significance for the large-scale integration of new energy sources into the power grid and the transition of the energy structure. Based ... Energy storage technology is critical for intelligent power grids. It has great significance for the large-scale integration of new energy sources into the power grid and the transition of the energy structure. Based on the existing technology of isothermal compressed air energy storage, this paper presents a design scheme of isothermal compressed air energy storage power station, which uses liquid to compress air, hydraulic piston to transfer potential energy, hydraulic turbine to generate electricity at constant pressure, and liquid occupancy to store the gas at constant pressure. Then the technical features and control strategies of its internal temperature control subsystem are studied, and the mathematical model is constructed. A hierarchical relay operation is put forward to address the actual construction and operational requirements of compressed air energy storage power plants. Finally, through physical platform experiments and MATLAB simulation, the feasibility of the design is validated. 展开更多
关键词 HIERARCHICAL RELAY operation ISOTHERMAL compression compressed air ENERGY STORAGE power PLANT ENERGY STORAGE
Constraining symmetry energy at subnormal density by isovector giant dipole resonances of spherical nuclei
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作者 苏军 《中国物理C:英文版》 SCIE CAS CSCD 2019年第6期80-84,共5页
In our previous study, the deduced Langevin equation has been applied to investigate the isoscalar giant monopole resonance. In the current study, the framework is extended to study the isovector giant dipole resonanc... In our previous study, the deduced Langevin equation has been applied to investigate the isoscalar giant monopole resonance. In the current study, the framework is extended to study the isovector giant dipole resonance(IVGDR). The potential well in the IVGDR is calculated by separating the neutron and proton densities based on the Hartree-Fock ground state. Subsequently, the Langevin equation is solved self-consistently, resulting in the centroid energy of the IVGDR without width. The symmetry energy around the density of 0.02 fm^-3 contributes the most to the potential well in the IVGDR. By comparison with the updated experimental data of IVGDR energies in spherical nuclei, the calculations within 37 sets of Skyrme functionals suggest the symmetry energy to be in the range of 8.13-9.54 MeV at a density of 0.02 fm^-3. 展开更多
关键词 isovector giant DIPOLE resonance symmetry ENERGY SKYRME energy-density functional
Energy efficient and delay aware ternary-state transceivers for aerial base stations 预览
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作者 Nahina Islam Kandeepan Sithamparanathan +2 位作者 Karina Gomez Chavez James Scott Hamid Eltom 《数字通信与网络:英文版》 2019年第1期40-50,共11页
In recent times, Aerial Base Stations(AeBSs) are being investigated to provide wireless coverage to terrestrial radio terminals. There are many advantages of using aerial platforms to provide wireless coverage, includ... In recent times, Aerial Base Stations(AeBSs) are being investigated to provide wireless coverage to terrestrial radio terminals. There are many advantages of using aerial platforms to provide wireless coverage, including larger coverage in remote areas and better line-of-sight conditions, etc. Energy is a scarce resource for the AeBSs, hence the wise management of energy is quite beneficial for the aerial network. In this context, we study the means of reducing the total energy consumption by designing and implementing an energy efficient AeBSs as presented in this paper. Implementing the sleep mode in the Base Stations (BSs) has been proven to be a very good approach for improving the energy efficiency and we propose a novel strategy for further improving energy efficiency by considering ternary state transceivers for AeBSs. Using the three state model, we propose a Markov Decision Process (MDP) based algorithm, which intelligently switches among three states of the transceivers based on the offered traffic meanwhile maintaining a prescribed minimum channel rate per user. We define a reward function for the MDP, which helps us to get an optimal policy for selecting a particular mode for the transceivers of the AeBS. Considering an AeBS with transceivers whose states are changeable, we perform simulations to analyse the performance of the algorithm. Our results show that, compared with the always active model, around 40% gain in the energy efficiency is achieved by using our proposed MDP algorithm together with the three-state transceivers model. We also show the energy-delay tradeoff in order to design an efficient AeBS. 展开更多
关键词 AERIAL base station UAV Green communication SLEEP mode Markov decision process ENERGY efficiency ENERGY DELAY TRADEOFF
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