检索结果-南通市图书馆

Ion conduction path in composite solid electrolytes for lithium metal batteries: from polymer rich to ceramic rich

在线全文

学校读者我要写书评

暂无评论

Frontiers in Energy 2022年第5期16卷 706-733页

作者： Zhouyu ZHANG Hao CHEN Zhenglin HU Shoubin ZHOU lan ZHANG Jiayan LUO Key Laboratory for Green Chemical technology of the Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Huafu High technology Energy Storage co. Ltd.Yangzhou 225600China CAS Key Laboratory of Green Process and Engineering Beijing Key Laboratory of Ionic Liquids Clean ProcessState Key Laboratory of Multiphase Complex SystemsInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China

Solid-state electrolytes(SSEs)can address the safety issue of organic electrolyte in rechargeable lithium ***,neither polymer nor ceramic SSEs used alone can meet the demand although great progress has been made in the past few *** solid electrolytes(CSEs)composed of flexible polymers and brittle but more conducting ceramics can take advantage of the individual system for solid-state lithium metal batteries(SSLMBs).CSEs can be largely divided into two categories by the mass fraction of the components:“polymer rich”(PR)and“ceramic rich”(CR)systems with different internal structures and electrochemical *** review provides a comprehensive and in-depth understanding of recent advances and limitations of both PR and CR electrolytes,with a special focus on the ion conduction path based on polymer-ceramic interaction mechanisms and structural designs of ceramic fillers/*** addition,it highlights the PR and CR which bring the leverage between the electrochemical property and the mechanical ***,it further prospects the possible route for future development of CSEs according to their rational design,which is expected to accelerate the practical application of SSLMBs.

关键词： composite solid electrolytes active filler/framework ion conduction path interphase compatibility multilayer design

Rapid on-line non-destructive detection of the moisture content of corn ear by bioelectrical impedance spectroscopy

在线全文

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2015年第6期8卷 37-45页

作者： Zhao Pengfei Zhang Hanlin Zhao Dongjie Wang Zhijie Fan Lifeng Huang lan Ma Qin Wang Zhongyi college of Information and Electrical Engineering China Agricultural UniversityBeijing 100083China Modern Precision Agriculture System Integration Research Key Laboratory Ministry of EducationBeijing 100083China Key Laboratory of Agricultural Information Acquisition technology(beijing) Ministry of AgricultureBeijing 100083China

Moisture content of corn directly affects its quality and storage time,and the rapid on-line detection of the moisture content of corn ears not threshed or in vivo in the fields is *** of the special shape of corn ear,the rapid,low cost and non-destructive bioelectrical impedance measurement is more suitable for its moisture content *** the four-electrode method with the Agilent E4980A precision LCR meter,the electrical impedance spectroscopies of the sweet corn ears and waxy corn ears at different moisture contents were *** frequency range of the detection was from 20 Hz to 2 MHz and to enhance the contact,the attached-type electrodes were wrapped in cotton soaked with 0.1%NaCl *** impedance data over the frequency range from 300 Hz to 5 kHz were used to obtain the parameters of the bio-impedance cole-cole *** results showed a good linear correlation(coefficient of determination R2=0.960)between the equivalent parallel resistance R∞of sweet corn ear and the moisture content value determined by standard chemical *** research proved that the bioelectrical impedance spectroscopy can be used for detecting the moisture content of corn ear.

关键词： moisture content non-destructive detection bioelectrical impedance spectroscopy corn ear

The geological characteristics of the large-and medium-sized gas fields in the South China Sea

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2021年第2期40卷 1-12页

作者： Gongcheng Zhang Dongdong Wang Lei lan Shixiang Liu Long Su Long Wang Wu Tang Jia Guo Rui Sun college of Earth Science and Engineering Shandong University of Science and TechnologyQingdao 266590China CNOOC Research Institute co. Ltd.Beijing 100028China Northwest Institute of Eco-Environment and Resources Chinese Academy of SciencesLanzhou 730000China Key Laboratory of Petroleum Resources Gansu ProvinceLanzhou 730000China

By the end of 2019,more than 220 gas fields had been discovered in the South China *** order to accurately determine the geological characteristics of the large-and medium-sized gas fields in the South China Sea,this study conducted a comprehensive examination of the gas *** on the abundant available geologic and geochemical data,the distribution and key controlling factors of the hydrocarbon accumulation in the South China Sea were *** geological and geochemical features of the gas fields were as follows:(1)the gas fields were distributed similar to beads in the shape of a"C"along the northern,western,and southern continental margins;(2)the natural gas in the region was determined to be composed of higher amounts of alkane gas and less co2;(3)the majority of the alkane gas was observed to be coal-type gas;(4)the gas reservoir types included structural reservoirs,lithologic reservoirs,and stratigraphic reservoirs,respectively;(5)the reservoir ages were mainly Oligocene,Miocene,and Pliocene,while the lithology was mainly organic reef,with some sandstone deposits;and(6)the main hydrocarbon accumulation period for the region was determined to be the late Pliocene-Quaternary *** addition,the main controlling factors of the gas reservoirs were confirmed to have been the development of coal measures,sufficient thermal evolution,and favorable migration and accumulation conditions.

关键词： coal-type gas coal measures thermal evolution hydrocarbon traps organic reefs South China Sea

Change in relative density of WC-co cemented carbides in spark plasma sintering process

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2008年第1期27卷 74-77页

作者： SUN lan LIN Chenguang JIA Chengchang JIA Xian XIAN Mina School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China School of Manufacturing Science and Engineering Sichuan University Chengdu 610065 China Powder Metallurgy and Special Materials Department General Research Institute for Nonferrous Metals Beijing 100088 China

The relative density of WC-co cemented carbides during spark plasma sintering（SPS） was *** on the change in displacement of the ram in the SPS system,the relative densities in the sintering process can be achieved at different *** results indicated that densification of the samples started at near 900°C,the density rapidly reached its maximum at the increasing temperature stage,in which the temperature was lower than the sintering temperature of 1200°C,and most of the densification took place in the ***,the theoretical values were consistent with the experimental results.

关键词： spark plasma sintering relative density WC-co cemented carbides

Two-dimensional vanadium carbide for simultaneously tailoring the hydrogen sorption thermodynamics and kinetics of magnesium hydride

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2022年第4期10卷 1051-1065页

作者： Chenglin Lu Haizhen Liu Li Xu Hui Luo Shixuan He Xingqing Duan Xiantun Huang Xinhua Wang Zhiqiang lan Jin Guo Guangxi Novel Battery Materials Research Center of Engineering technology Guangxi Key Laboratory of Processing for Non-ferrous Metallic and Featured MaterialsGuangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related TechnologySchool of Physical Science and TechnologyGuangxi UniversityNanning530004China State Key Laboratory of Advanced Power Transmission technology Global Energy Interconnection Research Institute Co.Ltd.Beijing102209China Department of Materials Science and Engineering Baise CollegeBaise533000GuangxiChina Department of Materials Science and Engineering Zhejiang UniversityHangzhou310027China

Magnesium hydride(MgH_(2))is a potential material for solid-state hydrogen ***,the thermodynamic and kinetic properties are far from practical application in the current *** this work,two-dimensional vanadium carbide(V_(2)C)MXene with layer thickness of 50−100 nm was fist synthesized by selectively HF-etching the Al layers from V_(2)AlC MAX phase and then introduced into MgH_(2) to improve the hydrogen sorption performances of MgH_(2).The onset hydrogen desorption temperature of MgH_(2) with V_(2)C addition is significantly reduced from 318℃ for pure MgH_(2) to 190℃,with a 128℃ reduction of the onset *** MgH_(2)+10 wt%V_(2)C composite can release 6.4 wt%of H_(2) within 10 min at 300℃ and does not loss any capacity for up to 10 *** activation energy for the hydrogen desorption reaction of MgH_(2) with V_(2)C addition was calculated to be 112 kJ mol^(−1) H_(2) by Arrhenius’s equation and 87.6 kJ mol^(−1) H_(2) by Kissinger’s *** hydrogen desorption reaction enthalpy of MgH_(2)+10 wt%V_(2)C was estimated by van’t Hoff equation to be 73.6 kJ mol^(−1) H_(2),which is slightly lower than that of the pure MgH_(2)(77.9 kJ mol^(−1) H_(2)).Microstructure studies by XPS,TEM,and SEM showed that V_(2)C acts as an efficient catalyst for the hydrogen desorption reaction of MgH_(2).The first-principles density functional theory(DFT)calculations demonstrated that the bond length of Mg−H can be reduced from 1.71A for pure MgH_(2) to 2.14A for MgH_(2) with V_(2)C addition,which contributes to the destabilization of MgH_(2).This work provides a method to significantly and simultaneously tailor the hydrogen sorption thermodynamics and kinetics of MgH_(2) by two-dimensional MXene materials.

关键词： Hydrogen storage MgH_(2) V_(2)C Catalyst DFT

A WiFi Indoor Positioning Strategy Based on Two-step Fingerprint Matching

在线全文

学校读者我要写书评

暂无评论

A WiFi Indoor Positioning Strategy Based on Two-step Fingerp...

Multi-task Allocation of Multi-UAV coalition Based on Improved Quantum Genetic Algorithm

第40届中国控制会议

作者： Yujie Pei Bing Wang lan Zhang University of Science & technology beijing Tianjin Aerospace Zhongwei Data System technology co. LTD

In the WiFi-based positioning system, the quality of received signal strength fingerprint samples directly affects positioning accuracy. This paper proposes a new database optimization and positioning matching method. In the offline phase,an optimal fingerprint database is formed by removing the outliers using threshold-based data pre-processing method;a high-density virtual fingerprint database based on above is generated by Gaussian process regression model. In the online phase, the outliers in fingerprint sample obtained in real-time are removed in the same way. Then, access point weighted multiple matching nearest neighbor algorithm based on Pearson correlation coefficient is used to initially determine the target region with optimized fingerprint database;the improved weighted k-nearest neighbor algorithm is utilized to calculate the target location with high-density virtual fingerprint database. Experimental results show that, compared with other algorithms, our proposed method can significantly improve the positioning accuracy while ensuring real-time performance.

关键词： ngerprint localization data processing Pearson correlation coefficient weighted k-nearest neighbor Gaussian process regression

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Multi-task Allocation of Multi-UAV Coalition Based on Improv...

Hierarchical Task Assignment of Multiple UAVs with Improved Firefly Algorithm Based on Simulated Annealing Mechanism

第40届中国控制会议

作者： Pengfei Liu Bing Wang Wenjie Liu lan Zhang University of Science & technology beijing Tianjin Aerospace Zhongwei Date System technology co. LTD

In the multi-UAV task allocation problem, one task may need several UAVs with specific capabilities to form a coalition to execute cooperatively. In this paper, considering the UAV coalition loss cost and time cost, an improved quantum genetic algorithm is proposed to solve the task allocation problem of multi-UAV coalition. On the basis of quantum genetic algorithm, the historical optimal solution retention mechanism and estimation of distribution algorithm are introduced to speed up the convergence speed and reduce the probability falling into the local optimum of the algorithm, respectively. Then, a gene repair strategy is used to improve the efficiency of the algorithm according to the problem background. Finally, the simulation results show that the proposed algorithm has more advantages than other comparison algorithms in terms of search ability and convergence speed in solving the task allocation problem of multi-UAV coalition.

关键词： Unmanned aerial vehicle Task allocation combinatorial optimization Quantum genetic algorithm

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Hierarchical Task Assignment of Multiple UAVs with Improved ...

Ti_(3)AICN MAX for tailoring MgH_(2) hydrogen storage material:from performance to mechanism

第40届中国控制会议

作者： Yali Wei Bing Wang Wenjie Liu lan Zhang University of Science & technology beijing Tianjin Aerospace Zhongwei Data System technology co. LTD

In the task assignment of multiple UAVs problem, task combination scale may expand significantly with UAVs and targets increasing. This paper proposes a new hierarchical task assignment method by means of multiple UAVs forming several groups to perform multi-task on a set of clusters. In the hierarchical decomposition phase, using the balance cluster method simplifies the large-scale UAV system and reduces computational complexity. In the task assignment phase, an improved firefly algorithm is proposed, which discretizes the original problem through double chains coding and adopts multi-neighbor search mechanism to maintain the diversity of the population. Finally, the Metropolis criterion in simulated annealing is introduced to avoid the algorithm falling into the local optimum. The simulation results show that, the fine effect of the proposed algorithm in terms of search ability and convergence speed, is demonstrated by comparison with other algorithms. And the hierarchical decomposition structure can significantly reduce assignment time in large-scale multi-UAV task assignment.

关键词： Unmanned aerial vehicle Task assignment Hierarchical decomposition combinatorial optimization Firefly algorithm Simulated annealing

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Rare Metals 2023年第6期42卷 1923-1934页

作者： Xing-Qing Duan Guang-Xu Li Wen-Hui Zhang Hui Luo Hai-Mei Tang Li Xu Peng Sheng Xin-Hua Wang Xian-Tun Huang Cun-Ke Huang Zhi-Qiang lan Wen-Zheng Zhou Jin Guo Mohammd Bin Ismail Hai-Zhen Liu Guangxi Novel Battery Materials Research Center of Engineering technology Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related TechnologySchool of Physical Science and TechnologyGuangxi UniversityNanning530004China State Key Laboratory of Advanced Power Transmission technology State Grid Smart Grid Research Institute Co.Ltd.Beijing102209China Department of Materials Science and Engineering Zhejiang UniversityHangzhou310027China Department of Materials Science and Engineering Baise CollegeBaise533000China Energy Storage Research Group Faculty of Ocean Engineering Technology and InformaticsUniversiti Malaysia TerengganuKuala Nerus21030Malaysia

Many MXenes are efficient catalysts for MgH_(2)hydrogen storage ***,the synthesis of MXenes should consume a large amount of corrosive HF to etch out the Al layers from the transition metal aluminum carbides or nitrides(MAX) phases,which is environmentally *** this work,Ti_(3)AlCN MAX without HFetching was employed directly to observably enhance the kinetics and the cycling stability of MgH_(2).With addition of10 wt% Ti_(3)AlCN,the onset dehydrogenation temperature of MgH2 was dropped from 320 to 205℃,and the rehydrogenation of MgH2 under 6 MPa H2 began at as low as50℃.Furthermore,at 300℃,it could provide 6.2 wt% of hydrogen in 10 *** cycling,the composite underwent an activation process during the initial 40 cycles,with the reversible capacity increased from 4.7 wt% to 6.5 wt%.After that,the capacity showed almost no attenuation for up to 100 *** enhancing effect of Ti_(3)AICN on MgH_(2) was comparable to many *** was demonstrated that Ti_(3)AICN did not destabilize MgH_(2) but acted as an efficient catalyst for MgH_(2).Ti_(3)AICN was observed to be the active sites for the nucleation and growth of MgH_(2)and might also help in dissociation and recombination of hydrogen *** two factors are believed to contribute to the improvement of MgH_(2).This study not only provides a promising strategy for improving the hydrogen storage performances of MgH_(2) by using noncorrosive MAX materials,but also adds evidence of nucleation and growth of MgH_(2) on a catalyst.

关键词： Hydrogen storage Magnesium hydride MAX MXene Titanium aluminum carbonitride