This paper designs and develops a framework on a distributed computing platform for massive multi-source spatial data using a column-oriented database(HBase).This platform consists of four layers including ETL(extract...This paper designs and develops a framework on a distributed computing platform for massive multi-source spatial data using a column-oriented database(HBase).This platform consists of four layers including ETL(extraction transformation loading) tier,data processing tier,data storage tier and data display tier,achieving long-term store,real-time analysis and inquiry for massive data.Finally,a real dataset cluster is simulated,which are made up of 39 nodes including 2 master nodes and 37 data nodes,and performing function tests of data importing module and real-time query module,and performance tests of HDFS's I/O,the MapReduce cluster,batch-loading and real-time query of massive data.The test results indicate that this platform achieves high performance in terms of response time and linear scalability.展开更多
Electrostatic energy^-storage capacitors,with their ultrahigh storage density and high temperature stability,have been receiving increasing attention of late for their ability to meet the critical requirements of puls...Electrostatic energy^-storage capacitors,with their ultrahigh storage density and high temperature stability,have been receiving increasing attention of late for their ability to meet the critical requirements of pulsed power devices in low^-consumption systems.In such a context,this work reports on the successful production of anti^-ferroelectric(AFE)thin films with excellent energy storage performance under a relatively low electric field.In particular,La^-doped Pb Zr O3 thin films were fabricated using a sol^-gel method,yielding a recoverable energy storage density of 34.87 J cm^-3 with an efficiency of 59.23%at room temperature under the electric field of^800 k V cm^-1.The temperature dependence of the energy storage property was demonstrated from room temperature to 210°C,indicating a stable density variation between 34.87 and 27.98 J cm^-3.The films also exhibited excellent anti^-fatigue property(endurance of up to 3×10^9cycles and the recoverable energy storage density varied from 39.78 to 29.32 J cm^-3 combined with an efficiency of 61.03%–44.95%under the test frequencies from 10 to 5000 Hz).All results were obtained using compact films with a high polarization(Pmax)of approximately 103.7μC cm^-2 and low remnant polarization(Pr^7μC cm^-2),which was owing to the combination of La Ni O3 buffer layers and vacancies at Pb sites.These results illustrate the great potential of pulsed power devices in low^-consumption systems operating in a wide range of temperatures and long^-term operations.展开更多
Multifunctional devices integrated with electrochromism and energy storage or energy production functions are attractive because these devices can be used as an effective approach to address the energy crisis and envi...Multifunctional devices integrated with electrochromism and energy storage or energy production functions are attractive because these devices can be used as an effective approach to address the energy crisis and environmental pollution in society today. In this review, we explain the operation principles of electrochromic energy storage devices including electrochromic supercapacitors,electrochromic batteries, and the photoelectrochromic devices. Furthermore, the material candidates and structure types of these multifunctional devices are discussed in detail. The major challenges of these devices along with a further outlook are highlighted at the end.展开更多
Flexible lithium-sulfur(Li-S)batteries are considered one of the most promising candidates for highenergy-density storage devices in wearable electronics.However,the safety problem severely restricts the practical app...Flexible lithium-sulfur(Li-S)batteries are considered one of the most promising candidates for highenergy-density storage devices in wearable electronics.However,the safety problem severely restricts the practical application of Li-S batteries because of the possible occurrence of thermal runaway caused by battery short circuits and combustible components,particularly under bending conditions.The development of advanced separators that can suppress lithium dendrite growth and are incombustible is the key to improving the safety of flexible Li-S batteries.In this work,a nonflammable multifunctional Janus separator with self-extinguishing capability,high thermal stability,high thermal conductivity,good electrolyte infiltration,uniform lithium deposition,and efficient polysulfide shuttling inhibition,is proposed.The separator is composed of polyacrylonitrile(PAN)fiber and decabromodiphenyl ethane(DBDPE)membrane as well as functional layers of boron nitride(BN)for suppressing lithium dendrite growth and reduced graphene oxide(rGO)for accelerating the sulfur convention kinetics.As a result,the Li-S battery with a sulfur mass loading of2.7 mg cm^(-2) delivers a specific capacity of 916.8 mA h g^(-1) after100 cycles at 0.1 C and maintains a stable performance during intermittent thermal shock.Moreover,the Li-S pouch cell with a sulfur mass loading of 8 mg exhibits a high capacity of6.3 mA h under bending conditions.展开更多
This paper discusses the properties of the storage functions for a class of nonlinear stochastic systems. Some necessary and sufficient conditions for a function to be a storage function are derived. As applications, ...This paper discusses the properties of the storage functions for a class of nonlinear stochastic systems. Some necessary and sufficient conditions for a function to be a storage function are derived. As applications, the finite and infinite horizon nonlinear stochastic H∞ controls for systems with state, control, and external disturbance dependent noise are investigated, which generalize the previous results.展开更多
For energy storage system,it is still a huge challenge to achieve high energy density and high power density simultaneously.One potential solution is to fabricate electrochemical capacitors(ECs),which store electric e...For energy storage system,it is still a huge challenge to achieve high energy density and high power density simultaneously.One potential solution is to fabricate electrochemical capacitors(ECs),which store electric energy through surface ion adsorption or redox reactions.Here we report a new electrode material,heavy nitrogen-doped(9.29 at.%)black titania(TiO2-x:N).This unique hybrid material,consisting of conductive amorphous shells supported on nanocrystalline cores,has rapid N-mediated redox reaction(TiO2-xNy+zH++ze■-TiO2-xNyHz),especially in acidic solutions,providing a specific capacitance of 750 Fg-1at 2 m V s-1(707 Fg-1at 1 A g-1),great rate capability(503 F g-1at 20 Ag-1),and maintain stable after initial fading.Being a new developed supercapacitor material,nitrogen-doped black titania may revive the oxide-based supercapacitors.展开更多
基金Supported by the National Science and Technology Support Project(No.2012BAH01F02)from Ministry of Science and Technology of Chinathe Director Fund(No.IS201116002)from Institute of Seismology,CEA
文摘This paper designs and develops a framework on a distributed computing platform for massive multi-source spatial data using a column-oriented database(HBase).This platform consists of four layers including ETL(extraction transformation loading) tier,data processing tier,data storage tier and data display tier,achieving long-term store,real-time analysis and inquiry for massive data.Finally,a real dataset cluster is simulated,which are made up of 39 nodes including 2 master nodes and 37 data nodes,and performing function tests of data importing module and real-time query module,and performance tests of HDFS's I/O,the MapReduce cluster,batch-loading and real-time query of massive data.The test results indicate that this platform achieves high performance in terms of response time and linear scalability.
基金supported by the National Key R&D Program of China(2018YFE0115500)the National Natural Science Foundation of China(61704159 and 51975541)+3 种基金Shanxi Province Science Foundation for Youths(201701D221125 and 201801D221199)Program for the Young Academic Leaders of the North University of China(QX201807)the Research Project Supported By Shanxi Scholarship Council of China(2019-066)Shanxi“1331 Project”Key Subject Construction(1331 KSC)。
文摘Electrostatic energy^-storage capacitors,with their ultrahigh storage density and high temperature stability,have been receiving increasing attention of late for their ability to meet the critical requirements of pulsed power devices in low^-consumption systems.In such a context,this work reports on the successful production of anti^-ferroelectric(AFE)thin films with excellent energy storage performance under a relatively low electric field.In particular,La^-doped Pb Zr O3 thin films were fabricated using a sol^-gel method,yielding a recoverable energy storage density of 34.87 J cm^-3 with an efficiency of 59.23%at room temperature under the electric field of^800 k V cm^-1.The temperature dependence of the energy storage property was demonstrated from room temperature to 210°C,indicating a stable density variation between 34.87 and 27.98 J cm^-3.The films also exhibited excellent anti^-fatigue property(endurance of up to 3×10^9cycles and the recoverable energy storage density varied from 39.78 to 29.32 J cm^-3 combined with an efficiency of 61.03%–44.95%under the test frequencies from 10 to 5000 Hz).All results were obtained using compact films with a high polarization(Pmax)of approximately 103.7μC cm^-2 and low remnant polarization(Pr^7μC cm^-2),which was owing to the combination of La Ni O3 buffer layers and vacancies at Pb sites.These results illustrate the great potential of pulsed power devices in low^-consumption systems operating in a wide range of temperatures and long^-term operations.
基金the National Natural Science Foundation of China (51572058, 91216123, 51174063, 51502057)the Natural Science Foundation of Heilongjiang Province (E201436)+1 种基金the International Science & Technology Cooperation Program of China(2013DFR10630, 2015DFE52770)the Specialized Research Fund for the Doctoral Program of Higher Education (SRFDP 20132302110031)
文摘Multifunctional devices integrated with electrochromism and energy storage or energy production functions are attractive because these devices can be used as an effective approach to address the energy crisis and environmental pollution in society today. In this review, we explain the operation principles of electrochromic energy storage devices including electrochromic supercapacitors,electrochromic batteries, and the photoelectrochromic devices. Furthermore, the material candidates and structure types of these multifunctional devices are discussed in detail. The major challenges of these devices along with a further outlook are highlighted at the end.
基金support from the National Natural Science Foundation of China(52072205)the National Key Research and Development Program of China(2019YFA0705700,2021YFB2500200)+1 种基金Shenzhen Stabilization Support Program(WDZC20200824091903001)the Start-up Funds of Tsinghua Shenzhen International Graduate School。
文摘Flexible lithium-sulfur(Li-S)batteries are considered one of the most promising candidates for highenergy-density storage devices in wearable electronics.However,the safety problem severely restricts the practical application of Li-S batteries because of the possible occurrence of thermal runaway caused by battery short circuits and combustible components,particularly under bending conditions.The development of advanced separators that can suppress lithium dendrite growth and are incombustible is the key to improving the safety of flexible Li-S batteries.In this work,a nonflammable multifunctional Janus separator with self-extinguishing capability,high thermal stability,high thermal conductivity,good electrolyte infiltration,uniform lithium deposition,and efficient polysulfide shuttling inhibition,is proposed.The separator is composed of polyacrylonitrile(PAN)fiber and decabromodiphenyl ethane(DBDPE)membrane as well as functional layers of boron nitride(BN)for suppressing lithium dendrite growth and reduced graphene oxide(rGO)for accelerating the sulfur convention kinetics.As a result,the Li-S battery with a sulfur mass loading of2.7 mg cm^(-2) delivers a specific capacity of 916.8 mA h g^(-1) after100 cycles at 0.1 C and maintains a stable performance during intermittent thermal shock.Moreover,the Li-S pouch cell with a sulfur mass loading of 8 mg exhibits a high capacity of6.3 mA h under bending conditions.
基金This research is supported by the National Natural Science Foundation of China under Grant Nos. 10921101 and 60874032, the National Basic Research Program of China （973 Program） under Grant No. 2007CB814904, the Key Project of Natural Science Foundation of Shandong Province under Grant No. ZR2009GZ001, and the Specialized Research Fund for the Doctoral Program of Higher Education under Grant No. 20103718110006.
文摘This paper discusses the properties of the storage functions for a class of nonlinear stochastic systems. Some necessary and sufficient conditions for a function to be a storage function are derived. As applications, the finite and infinite horizon nonlinear stochastic H∞ controls for systems with state, control, and external disturbance dependent noise are investigated, which generalize the previous results.
基金financially supported by the National key R&D Program of China(2016YFB0901600)the Key Research Program of Chinese Academy of Sciences(QYZDJ-SSWJSC013)Chen IW was supported by U.S.Department of Energy BES grant DE-FG02-11ER46814used the facilities(Laboratory for Research on the Structure of Matter)supported by NSF grant DMR-1120901。
文摘For energy storage system,it is still a huge challenge to achieve high energy density and high power density simultaneously.One potential solution is to fabricate electrochemical capacitors(ECs),which store electric energy through surface ion adsorption or redox reactions.Here we report a new electrode material,heavy nitrogen-doped(9.29 at.%)black titania(TiO2-x:N).This unique hybrid material,consisting of conductive amorphous shells supported on nanocrystalline cores,has rapid N-mediated redox reaction(TiO2-xNy+zH++ze■-TiO2-xNyHz),especially in acidic solutions,providing a specific capacitance of 750 Fg-1at 2 m V s-1(707 Fg-1at 1 A g-1),great rate capability(503 F g-1at 20 Ag-1),and maintain stable after initial fading.Being a new developed supercapacitor material,nitrogen-doped black titania may revive the oxide-based supercapacitors.
