Lithium-sulfur batteries(LSBs)are a promising candidate for next-generation energy storage solutions.However,challenges such as the shuttling effect and sluggish Li-S reaction kinetics of lithium polysulfides hinder t...Lithium-sulfur batteries(LSBs)are a promising candidate for next-generation energy storage solutions.However,challenges such as the shuttling effect and sluggish Li-S reaction kinetics of lithium polysulfides hinder their practical application.In this work,we present a mixed-phase heterostructure comprising Co_(0.85)Se and MoSe_(2),supported on nitrogen-doped carbon polyhedrons(NCP),as an effective sulfur host in the LSB cathode.Through a combination of theoretical calculations and experimental validation,we demonstrate that the Co_(0.85)Se-MoSe_(2)heterointerface significantly enhances electron transfer efficiency,thereby boosting the overall reaction kinetics of the sulfur cathode.As a result,the Co_(0.85)Se-MoSe_(2)/NCP/S electrodes exhibit initial specific capacities exceeding 1500 mAh g^(-1)at 0.1 C and retain 666 m Ah g^(-1)at 3 C,with a capacity fade rate of 0.044%per cycle over 500 cycles at 1.0 C.Notably,even at a high sulfur loading of 3 mg cm^(-2)and a reduced electrolyte volume of 6.7μL mgS^(-1),the Co_(0.85)SeMoSe_(2)/NCP/S electrodes maintain a capacity of 432 mAh g^(-1)after 100 cycles at 0.2 C.展开更多
During the operation of the rice combine harvester,the fuselage tilts due to the tilt and unevenness of the ground affect its maneuverability and operational reliability.Aiming at the problem of leveling due to the ti...During the operation of the rice combine harvester,the fuselage tilts due to the tilt and unevenness of the ground affect its maneuverability and operational reliability.Aiming at the problem of leveling due to the tilt of the field surface,this research developed an innovative dual-parallelogram chassis lifting mechanism for rice harvesters designed a hydraulic system to adjust the chassis height by extending the cylinder.Using Adams simulation software,a detailed model of the lifting chassis was constructed to analyze its performance,revealing a direct correlation between the hydraulic cylinder extension and chassis elevation.Notably,the mechanism could achieve leveling on slopes with inclination angles of up to 7.5°.Comprehensive evaluations of the liftable chassis system were conducted under both static and dynamic conditions.In the static tests,the system exhibited the capacity for comprehensive or unilateral auto-leveling contingent upon the tilt,with leveling times and angular variations confined to 3.6 s and±0.4°,respectively.In dynamic tests conducted on sloped fields and paddy soils,the system reduced post-leveling mean tilt angles and standard deviations remained below 1.2°and 0.6°,respectively.These results demonstrated a substantial improvement in the stability and reliability of the chassis during operations.This research provides valuable insights into the design and optimization of automatic leveling mechanisms and structural innovations for harvester chassis.展开更多
Software defined optical networking(SDON)is a critical technology for the next generation network with the advantages of programmable control and etc.As one of the key issues of SDON,the security of control plane has ...Software defined optical networking(SDON)is a critical technology for the next generation network with the advantages of programmable control and etc.As one of the key issues of SDON,the security of control plane has also received extensive attention,especially in certain network scenarios with high security requirement.Due to the existence of vulnerabilities and heavy overhead,the existing firewalls and distributed control technologies cannot solve the control plane security problem well.In this paper,we propose a distributed control architecture for SDON using the blockchain technique(BlockCtrl).The proposed BlockCtrl model introduces the advantages of blockchain into SDON to achieve a high-efficiency fault tolerant control.We have evaluated the performance of our proposed architecture and compared it to the existing models with respect to various metrics including processing rate,recovery latency and etc.The numerical results show that the BlockCtrl is capable of attacks detection and fault tolerant control in SDON with high performance on resource utilization and service correlation.展开更多
Room temperature phosphorescent(RTP)materials have a variety of applications ranging from bioimaging,optoelectronic devices to information security protection.However,the preparation procedures for these materials are...Room temperature phosphorescent(RTP)materials have a variety of applications ranging from bioimaging,optoelectronic devices to information security protection.However,the preparation procedures for these materials are always tedious and time-consuming.Here,we report a micro-wave approach to prepare RTP carbon dots(CDs)in only 8 min.The micro-wave promoted the carbon and boron bond formation using natural compounds glucose and boric acids.This result has been confirmed using TEM,FTIR,XPS and XRD measurements.The C-B hetero atomized material presented a long afterglow property.With the irradiation with UV light,we observed an eight-second RTP by naked eyes after the lamp was turned off,and the phosphorescence lifetime was 487 ms.This excellent performance was mainly due to the formation of B-C bonds that promoted the intersystem crossings(ISC)and non-radiation transition of triplet states.Moreover,the glass state of the materials also helped to stabilize the triplet states of B-CDs and made its non-irradiation inactivated,which resulted in the characteristics of yellow green RTP.These results have demonstrated that micro-wave is a convenient and effective strategy to make hetero atomized RTP material,providing new possibilities for their industrial productions.展开更多
基金support from the 2BoSS project of the ERA-MIN3 program with the Spanish grant number PCI2022-132985/AEI/10.13039/501100011033funding from the Generalitat de Catalunya 2021SGR01581 and 2021SGR00457+9 种基金the European Union NextGenerationEU/PRTR,the Natural Science Foundation of Chongqing(No.2023NSCQ-MSX1669)the Science and Technology Research Program of Chongqing Municipal Education Commission(No.KJZDK202401110)support of the Supercomputing Center of Lanzhou University,Chinasupported by MCIN with funding from European Union NextGenerationEU(PRTR-C17.I1)by Generalitat de Catalunya(In-CAEM Project)support from the project AMaDE(PID2023-149158OB-C43)funded by MCIN/AEI/10.13039/501100011033/funding from the CSC-UAB PhD scholarship programfunding from Grant IU16-014206(METCAM-FIB)funded by the European Union through the European Regional Development Fund(ERDF)support of the Ministry of Research and Universities,Generalitat de Catalunya。
文摘Lithium-sulfur batteries(LSBs)are a promising candidate for next-generation energy storage solutions.However,challenges such as the shuttling effect and sluggish Li-S reaction kinetics of lithium polysulfides hinder their practical application.In this work,we present a mixed-phase heterostructure comprising Co_(0.85)Se and MoSe_(2),supported on nitrogen-doped carbon polyhedrons(NCP),as an effective sulfur host in the LSB cathode.Through a combination of theoretical calculations and experimental validation,we demonstrate that the Co_(0.85)Se-MoSe_(2)heterointerface significantly enhances electron transfer efficiency,thereby boosting the overall reaction kinetics of the sulfur cathode.As a result,the Co_(0.85)Se-MoSe_(2)/NCP/S electrodes exhibit initial specific capacities exceeding 1500 mAh g^(-1)at 0.1 C and retain 666 m Ah g^(-1)at 3 C,with a capacity fade rate of 0.044%per cycle over 500 cycles at 1.0 C.Notably,even at a high sulfur loading of 3 mg cm^(-2)and a reduced electrolyte volume of 6.7μL mgS^(-1),the Co_(0.85)SeMoSe_(2)/NCP/S electrodes maintain a capacity of 432 mAh g^(-1)after 100 cycles at 0.2 C.
基金Sichuan Science and Technology Program(2022YFG0077)。
文摘During the operation of the rice combine harvester,the fuselage tilts due to the tilt and unevenness of the ground affect its maneuverability and operational reliability.Aiming at the problem of leveling due to the tilt of the field surface,this research developed an innovative dual-parallelogram chassis lifting mechanism for rice harvesters designed a hydraulic system to adjust the chassis height by extending the cylinder.Using Adams simulation software,a detailed model of the lifting chassis was constructed to analyze its performance,revealing a direct correlation between the hydraulic cylinder extension and chassis elevation.Notably,the mechanism could achieve leveling on slopes with inclination angles of up to 7.5°.Comprehensive evaluations of the liftable chassis system were conducted under both static and dynamic conditions.In the static tests,the system exhibited the capacity for comprehensive or unilateral auto-leveling contingent upon the tilt,with leveling times and angular variations confined to 3.6 s and±0.4°,respectively.In dynamic tests conducted on sloped fields and paddy soils,the system reduced post-leveling mean tilt angles and standard deviations remained below 1.2°and 0.6°,respectively.These results demonstrated a substantial improvement in the stability and reliability of the chassis during operations.This research provides valuable insights into the design and optimization of automatic leveling mechanisms and structural innovations for harvester chassis.
基金supported in part by NSFC project(61871056)Young Elite Scientists Sponsorship Program by CAST(2018QNRC001)+1 种基金Fundamental Research Funds for the Central Universities(2018XKJC06)Open Fund of SKL of IPOC(BUPT)(IPOC2018A001)
文摘Software defined optical networking(SDON)is a critical technology for the next generation network with the advantages of programmable control and etc.As one of the key issues of SDON,the security of control plane has also received extensive attention,especially in certain network scenarios with high security requirement.Due to the existence of vulnerabilities and heavy overhead,the existing firewalls and distributed control technologies cannot solve the control plane security problem well.In this paper,we propose a distributed control architecture for SDON using the blockchain technique(BlockCtrl).The proposed BlockCtrl model introduces the advantages of blockchain into SDON to achieve a high-efficiency fault tolerant control.We have evaluated the performance of our proposed architecture and compared it to the existing models with respect to various metrics including processing rate,recovery latency and etc.The numerical results show that the BlockCtrl is capable of attacks detection and fault tolerant control in SDON with high performance on resource utilization and service correlation.
基金the financial support from the National Natural Science Foundation of China(No.21801052)Hainan University start-up fund(No.KYQD(ZR)1852)the construction program of research platform in Hainan University(No.ZY2019HN09)。
文摘Room temperature phosphorescent(RTP)materials have a variety of applications ranging from bioimaging,optoelectronic devices to information security protection.However,the preparation procedures for these materials are always tedious and time-consuming.Here,we report a micro-wave approach to prepare RTP carbon dots(CDs)in only 8 min.The micro-wave promoted the carbon and boron bond formation using natural compounds glucose and boric acids.This result has been confirmed using TEM,FTIR,XPS and XRD measurements.The C-B hetero atomized material presented a long afterglow property.With the irradiation with UV light,we observed an eight-second RTP by naked eyes after the lamp was turned off,and the phosphorescence lifetime was 487 ms.This excellent performance was mainly due to the formation of B-C bonds that promoted the intersystem crossings(ISC)and non-radiation transition of triplet states.Moreover,the glass state of the materials also helped to stabilize the triplet states of B-CDs and made its non-irradiation inactivated,which resulted in the characteristics of yellow green RTP.These results have demonstrated that micro-wave is a convenient and effective strategy to make hetero atomized RTP material,providing new possibilities for their industrial productions.
