A simulation method based on the lumped mass model is proposed for determining the dynamic behavior of nets exposed to a uniform current. Every mesh bar is modeled by a linear bar clement. The lumped mass point is set...A simulation method based on the lumped mass model is proposed for determining the dynamic behavior of nets exposed to a uniform current. Every mesh bar is modeled by a linear bar clement. The lumped mass point is set at the ends of each element. The net can be simulated by a discretized model consisting of many point masses and elements without mass. 3D shapes and the distribution of tensions of the net at different moments can be found from time integration of a set of motion equations with a computer program. Two nets are simulated according to reference experiments. Calculated results are in accordance with experimental results. The method is applicable and can be applied to improving design of, and research into other flexible structures, such as net cages.展开更多
Because of the pressure in environmental protection and the less amount of conventional energy, more and more countries around the world attached great importance to the development and utilization of bioenergy. Using...Because of the pressure in environmental protection and the less amount of conventional energy, more and more countries around the world attached great importance to the development and utilization of bioenergy. Using bioenergy effectively and setting up a perfect bioenergy industry chain are the premises for bioenergy to be well developed. The main applications of bioenergy in China are electric power generating and fuel refining. But there is still some gap between Chinaand other countries in bioenergy’s development, not only in the technology, but also in government policy support. First of all, this paper briefly introduces the concept and the basic condition, the development and utilization of bioenergy inChina. Secondly, this paper makes an analysis and comparison of supply chain for the biomass and coal. Finally, this paper gives some suggestions to the further research orientation of the biomass supply chain based on its characteristics.展开更多
We investigate the structure of rings over which every finitely generated g- supplemented module is supplemented. Some characterizations of this type of rings are given. We establishe some properties of ⊙-δ-suppleme...We investigate the structure of rings over which every finitely generated g- supplemented module is supplemented. Some characterizations of this type of rings are given. We establishe some properties of ⊙-δ-supplemented modules. It is showed that for a ring R, finitely generated δ-supplemented R-modules are supplemented if and only if finitely generated ⊙-δ-supplemented R-modules are ⊙-supplemented.展开更多
https://www.sciencedirect.com/journal/energy-and-buildings/vol/327/suppl/C Volume 327,15 January 2025[OA](1)Energy storage potential of cementitious materials:Advances,challenges and future directions by Salim Barbhui...https://www.sciencedirect.com/journal/energy-and-buildings/vol/327/suppl/C Volume 327,15 January 2025[OA](1)Energy storage potential of cementitious materials:Advances,challenges and future directions by Salim Barbhuiya,Bibhuti Bhusan Das,Dibyendu Adak,Article 115063 Abstract:This review paper investigates the use of cementitious materials for energy storage,emphasizing their role in advancing sustainable development.It starts with a comprehensive overview of energy storage technologies and explores the key properties of cementitious materials that make them suitable for energy storage,alongside the challenges and opportunities they present.The review covers different energy storage mechanisms,including chemical,thermal,and electrical methods,highlighting the efficiency and capacity of each approach.Performance evaluation is addressed through specific criteria,experimental techniques,and case studies,with numerical outcomes provided to illustrate the effectiveness of these materials in energy storage.The paper also discusses potential applications in energy infrastructure and construction,identifying emerging technological advancements and trends.Environmental and economic considerations,such as sustainability benefits and cost analysis,are evaluated in detail.Finally,the review summarizes key insights,outlines the implications for sustainable energy systems,and offers specific recommendations for future research and development to optimize the use of cementitious materials in energy storage.展开更多
Energy and Buildings https://www.sciencedirect.com/journal/energy-and-buildings/vol/326/suppl/C Volume 326,1 January 2025[OA](1)Assessment of cooling capacity of chimney-enhanced cross-ventilation systems for kinderga...Energy and Buildings https://www.sciencedirect.com/journal/energy-and-buildings/vol/326/suppl/C Volume 326,1 January 2025[OA](1)Assessment of cooling capacity of chimney-enhanced cross-ventilation systems for kindergartens in African cities by Jo o Carlos Sim es,Hugo M.Nunes,Guilherme Carrilho da Gra a,et al,Article 115048 Abstract:This study proposed a novel approach for naturally ventilated buildings to address the challenges of rising temperatures and increased urban heat island effect in African cities.Existing research often overlooks the performance of combined wind and buoyancy-driven systems in the context of climate change.This research introduced a novel chimney-enhanced cross-ventilation configuration that effectively combined both wind and buoyancy effects for optimal performance.展开更多
We propose a novel scheme for the population and depletion of nuclear isomers.This scheme combines the γ photons with energiesà 10 keV emitted during the interaction of a contemporary high-intensity laser pulse ...We propose a novel scheme for the population and depletion of nuclear isomers.This scheme combines the γ photons with energiesà 10 keV emitted during the interaction of a contemporary high-intensity laser pulse with a plasma and one or multiple photon beams supplied by intense lasers.Owing to nonlinear effects,two-or multiphoton absorption dominates over the conventional multistep one-photon process for an optimized γ flash.Moreover,this nonlinear effect can be greatly enhanced with the help of externally supplied low-energy photons coming from another laser.These low-energy photons act such that the effective cross-section experienced by the γ photons becomes tunable,growing with the intensity I_(0) of the beam.Assuming I_(0)~10^(18) W·cm^(-2) for the photon beam,an effective cross-section as large as 10^(-21)-10^(-28) cm^(2) for the γ photons can be achieved.Thus,with state-of-the-art 10 PW laser facilities,the yields from two-photon absorption can reach 10^(6)-10^(9) isomers per shot for selected states that are separated from their ground state by E2 transitions.Similar yields for transitions with higher multipolarities can be accommodated by multiphoton absorption with additional photons provided.展开更多
基金This project was financially supported by the High Technology Research and Development Program of China (GrantNo.2001AA623030 and No.2003AA623030)
文摘A simulation method based on the lumped mass model is proposed for determining the dynamic behavior of nets exposed to a uniform current. Every mesh bar is modeled by a linear bar clement. The lumped mass point is set at the ends of each element. The net can be simulated by a discretized model consisting of many point masses and elements without mass. 3D shapes and the distribution of tensions of the net at different moments can be found from time integration of a set of motion equations with a computer program. Two nets are simulated according to reference experiments. Calculated results are in accordance with experimental results. The method is applicable and can be applied to improving design of, and research into other flexible structures, such as net cages.
文摘Because of the pressure in environmental protection and the less amount of conventional energy, more and more countries around the world attached great importance to the development and utilization of bioenergy. Using bioenergy effectively and setting up a perfect bioenergy industry chain are the premises for bioenergy to be well developed. The main applications of bioenergy in China are electric power generating and fuel refining. But there is still some gap between Chinaand other countries in bioenergy’s development, not only in the technology, but also in government policy support. First of all, this paper briefly introduces the concept and the basic condition, the development and utilization of bioenergy inChina. Secondly, this paper makes an analysis and comparison of supply chain for the biomass and coal. Finally, this paper gives some suggestions to the further research orientation of the biomass supply chain based on its characteristics.
文摘We investigate the structure of rings over which every finitely generated g- supplemented module is supplemented. Some characterizations of this type of rings are given. We establishe some properties of ⊙-δ-supplemented modules. It is showed that for a ring R, finitely generated δ-supplemented R-modules are supplemented if and only if finitely generated ⊙-δ-supplemented R-modules are ⊙-supplemented.
文摘https://www.sciencedirect.com/journal/energy-and-buildings/vol/327/suppl/C Volume 327,15 January 2025[OA](1)Energy storage potential of cementitious materials:Advances,challenges and future directions by Salim Barbhuiya,Bibhuti Bhusan Das,Dibyendu Adak,Article 115063 Abstract:This review paper investigates the use of cementitious materials for energy storage,emphasizing their role in advancing sustainable development.It starts with a comprehensive overview of energy storage technologies and explores the key properties of cementitious materials that make them suitable for energy storage,alongside the challenges and opportunities they present.The review covers different energy storage mechanisms,including chemical,thermal,and electrical methods,highlighting the efficiency and capacity of each approach.Performance evaluation is addressed through specific criteria,experimental techniques,and case studies,with numerical outcomes provided to illustrate the effectiveness of these materials in energy storage.The paper also discusses potential applications in energy infrastructure and construction,identifying emerging technological advancements and trends.Environmental and economic considerations,such as sustainability benefits and cost analysis,are evaluated in detail.Finally,the review summarizes key insights,outlines the implications for sustainable energy systems,and offers specific recommendations for future research and development to optimize the use of cementitious materials in energy storage.
文摘Energy and Buildings https://www.sciencedirect.com/journal/energy-and-buildings/vol/326/suppl/C Volume 326,1 January 2025[OA](1)Assessment of cooling capacity of chimney-enhanced cross-ventilation systems for kindergartens in African cities by Jo o Carlos Sim es,Hugo M.Nunes,Guilherme Carrilho da Gra a,et al,Article 115048 Abstract:This study proposed a novel approach for naturally ventilated buildings to address the challenges of rising temperatures and increased urban heat island effect in African cities.Existing research often overlooks the performance of combined wind and buoyancy-driven systems in the context of climate change.This research introduced a novel chimney-enhanced cross-ventilation configuration that effectively combined both wind and buoyancy effects for optimal performance.
基金supported by the Extreme Light Infrastructure Nuclear Physics(ELI-NP)Phase Ⅱ,a project co-financed by the Romanian Government and the European Union through the European Regional Development Fund—the Competitiveness Operational Programme(1/07.07.2016,COP,ID 1334)the Romanian Ministry of Research and Innovation:PN23210105(Phase 2,the Program Nucleu),ELI-RO grants Proiectul ELI-RO/RDI_2024_AMAP,ELI-RO_RDI_2024_LaLuThe,ELIRO_RDI_2024_SPARC+4 种基金ELI10/01.10.2020 of the Romanian Governmentthe European Union,the Romanian Governmentthe Health Program,within the project“Medical Applications of High-Power Lasers—Dr.LASER”SMIS Code:326475the IOSIN funds for research infrastructures of national interest.
文摘We propose a novel scheme for the population and depletion of nuclear isomers.This scheme combines the γ photons with energiesà 10 keV emitted during the interaction of a contemporary high-intensity laser pulse with a plasma and one or multiple photon beams supplied by intense lasers.Owing to nonlinear effects,two-or multiphoton absorption dominates over the conventional multistep one-photon process for an optimized γ flash.Moreover,this nonlinear effect can be greatly enhanced with the help of externally supplied low-energy photons coming from another laser.These low-energy photons act such that the effective cross-section experienced by the γ photons becomes tunable,growing with the intensity I_(0) of the beam.Assuming I_(0)~10^(18) W·cm^(-2) for the photon beam,an effective cross-section as large as 10^(-21)-10^(-28) cm^(2) for the γ photons can be achieved.Thus,with state-of-the-art 10 PW laser facilities,the yields from two-photon absorption can reach 10^(6)-10^(9) isomers per shot for selected states that are separated from their ground state by E2 transitions.Similar yields for transitions with higher multipolarities can be accommodated by multiphoton absorption with additional photons provided.
