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Lithiated Nafion-garnet ceramic composite electrolyte membrane for solid-state lithium metal battery

Journal of Energy Chemistry 2020年第7期29卷 237-247,I0008页

作者： Jing gao Qinjun Shao jian Chen Advanced Rechargeable Battery Laboratory Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China

Single-ion conducting solid polymer electrolytes are expected to play a vital role in the realization of solid-state Li metal *** this work,a lithiated Nafion(Li-Nafion)-garnet ceramic Li6.25La3 Zr2 Al0.25O12(LLZAO)composite solid electrolyte(CSE)membrane with 30μm thickness was prepared for the first *** employing X-ray photoelectron spectroscopy and transmission electron microscope,the interaction between LLZAO and Li-Nafion was *** is found that the LLZAO interacts with the Li-Nafion to form a space charge layer at the interface between LLZAO and *** space charge layer reduces the migration barrier of Li-ions and improves the ionic conductivity of the CSE *** CSE membrane containing 10 wt%LLZAO exhibits the highest ionic conductivity of2.26×10-4 S cm-1 at 30℃among the pristine Li-Nafion membrane,the membrane containing 5 wt%,20 wt%,and 30 wt%LLZAO,*** also exhibits a high Li-ion transference number of 0.92,and a broader electrochemical window of 0-+4.8 V ***+/Li than that of 0-+4.0 V ***+/Li for the pristine Li-Nafion *** is observed that the CSE membrane not only inhibits the growth of Li dendrites but also keeps excellent electrochemical stability with the Li *** from the above merits,the solid-state LiFePO4/Li cell fabricated with the CSE membrane was practically charged and discharged at 30℃.The cell exhibits an initial reversible discharge specific capacity of 160 mAh g-1 with 97%capacity retention after 100 cycles at 0.2 C,and maintains discharge specific capacity of 126 mAh g-1 after500 cycles at 1 *** CSE membrane prepared with Li-Nafion and LLZAO is proved to be a promising solid electrolyte for advanced solid-state Li metal batteries.

关键词： Single-ion conductor Composite solid electrolyte Lithiated Nafion Garnet ceramic Solid-state Li metal battery

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Minimum-energy leader-following formation of distributed multiagent systems with communication constraints

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Journal of Systems Engineering and Electronics 2023年第6期34卷 1419-1431页

作者： QIN Donghao WANG Le gao Jiuan xi jianxiang Rocket Force University of Engineering Xi’an 710025China

This paper concerns minimum-energy leader-following formation design and analysis problems of distributed multiagent systems(DMASs)subjected to randomly switching topologies and aperiodic communication *** critical feature of this paper is that the energy consumption during the formation control process is restricted by the minimum-energy constraint in the sense of the linear matrix ***,the leader-following formation control protocol is proposed based on the relative state information of neighboring agents,where the total energy consumption is ***,minimum-energy leader-following formation design and analysis criteria are presented in the form of the linear matrix inequality,which can be checked by the generalized eigenvalue ***,the value of the minimum-energy constraint is *** illustrative simulation is provided to show the effectiveness of the main results.

关键词： multi-agent system leader-following formation communication pause minimum energy.

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Comparative study on flow and heat transfer characteristics of sinusoidal and zigzag channel printed circuit heat exchangers

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Science China(Technological Sciences) 2020年第4期63卷 655-667页

作者： WEN Zhe-xi LV Yi-gao LI Qing School of Energy Science and EngineeringCentral South UniversityChangsha 410083China

Printed circuit heat exchangers(PCHEs)are promising candidates for recuperators in supercritical CO2 Brayton cycles.A comparative study is given in this paper on the flow and heat transfer characteristics of PCHEs with sinusoidal and zigzag *** mass flow rates of 0.6–1.8 kg/h and the bend angles of 15°–30°,the thermal-hydraulic performance of the PCHEs is *** show that the sinusoidal channel is superior to the zigzag channel in its comprehensive *** bend angles result in greater reductions in pressure drop if sinusoidal channels are used instead of zigzag channels and a maximum of 48.4%reduction can be obtained in the considered working ***,the inlet sections should be carefully optimized since these sections account for up to 31%and 17%of the total pressure drop in the sinusoidal and zigzag channels,*** corner shape of the zigzag channel can be specially designed to further reduce the pressure *** nonuniform density and heat flux distributions in both channels are found to be related to the periodic changes of flow directions and the centrifugal forces should not be ignored when optimizing the sinusoidal and zigzag channels.

关键词： printed circuit heat exchanger supercritical CO2 thermal-hydraulic performance sinusoidal channel numerical simulation

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Prediction of NO_(x)concentration using modular long short-term memory neural network for municipal solid waste incineration

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Chinese Journal of Chemical Engineering 2023年第4期56卷 46-57页

作者： Haoshan Duan xi Meng jian Tang Junfei Qiao Faculty of Information Technology Beijing University of TechnologyBeijing 100124China Beijing Laboratory of Smart Environmental Protection Beijing 100124China Beijing Key Laboratory of Computational Intelligence and Intelligent System Beijing 100124China Engineering Research Center of Intelligence Perception and Autonomous Control Ministry of Education Beijing 100124China

Air pollution control poses a major problem in the implementation of municipal solid waste incineration(MSWI).Accurate prediction of nitrogen oxides(NO_(x))concentration plays an important role in efficient NO_(x)emission *** this study,a modular long short-term memory(M-LSTM)network is developed to design an efficient prediction model for NO_(x)***,the fuzzy C means(FCM)algorithm is utilized to divide the task into several sub-tasks,aiming to realize the divide-and-conquer ability for complex ***,long short-term memory(LSTM)neural networks are applied to tackle corresponding sub-tasks,which can improve the prediction accuracy of the ***,a cooperative decision strategy is designed to guarantee the generalization performance during the testing or application ***,after being evaluated by a benchmark simulation,the proposed method is applied to a real MSWI *** the experimental results demonstrate the considerable prediction ability of the M-LSTM network.

关键词： Municipal solid waste incineration NO_(x)concentration prediction Modular neural network Model

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Evaluation of thermal effects on temperature-sensitive operating force of flow servo valve for fuel metering unit

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Chinese Journal of Aeronautics 2020年第6期33卷 1812-1823页

作者： Yang ZHANG Shaoping WANG jian SHI xi WANG School of Energy and Power Engineering Beihang UniversityBeijing 100083China School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100083China

The temperature-induced variation in operating force of flow control valves may result in performance degradation or even jam faults of fuel metering unit(FMU), which significantly affects the safety of aircrafts. In this work, an analytical modeling approach of temperature-sensitive operating-force of servo valve is proposed to investigate the temperature characteristics in varying temperature conditions. Considering the temperature effects, a new extended model of flow force is built and an analytical model of valve friction is also derived theoretically based on the dynamic clearance induced by thermal effects. The extremum condition of friction is obtained to analyze the characteristic-temperature points where jam faults occur easily. The numerical results show that flow force increases firstly and then decreases as temperature increases under a constant valve opening. The maximum friction of flow servo valve can be uniquely determined when the structural parameters and ambient temperature are given. The worst situation just happens at the characteristic-temperature points, which are linearly related to the axial temperature gradients of valve spool. Such evaluations may give an explanation for the temperature-induced jam faults of vulnerable valves and provide a reference for designers to determine a suitable workingtemperature range of valves in practice.

关键词： Jam fault Servovalve Spool deformation Spool friction Temperature effect

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Extended hopanes and 8,14-secohopanes up to C_(40)in unbiodegraded marine oils from the Tarim Basin,NW China

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Petroleum Science 2022年第2期19卷 498-508页

作者： jian-Ping Bao Cui-Shan Zhu xi Yang Hubei Key Laboratory of Petroleum Geochemistry and Environment Key Lab.of Exploration Technologies for Oil&Gas ResourcesMinistry of EducationGeochemistry DepartmentYangtze UniversityWuhan430100HubeiChina

Extended 17α(H),21β(H)-hopanes and three series of 8,14-secohopanes up to C_(40),including 8α(H),14α(H),17α(H),21β(H)-,8α(H),14α(H),17β(H),21α(H)-and 8α(H),14β(H),17β(H),21α(H)-,were detected by GC-MS-MS method in the branched/cyclic hydrocarbon fractions of some unbiodegraded marine oils from the Tazhong uplift in the Tarim Basin,NW *** coexistence of extended hopanes and 8,14-secohopanes up to C_(40)in unbiodegraded oils suggests that they are primary and independent on *** similarity of distribution and composition for extended hopanes and 8,14-secohopanes up to C_(40)in unbiodegraded oils proposes that they could be derived from a similar biological ***,an abrupt decrease up to 3-5 times in the relative abundance from C_(35)to C_(36)in C_(31-40)extended hopanes and extended 8,14-secohopanes suggests that C_(31-35)and C_(36-40)extended hopanes and extended 8,14-secohopanes should have their own biological *** known C35bacteriohopanetetrol should be biological precursor of C_(31-35)extended hopanes and 8,14-secohopanes,but an unknown C_(40)functionalized hopanoid could be biological precursor of C_(36-40)extended hopanes and 8,*** attention should be paid to their potential roles in oil-source correlation for severely biodegraded oils based on their widespread occurrence in various source rocks,unbiodegraded and severely biodegraded oils.

关键词： Extended hopanes Extended 8,14-secohopanes Biomarkers Bacteriohopanetetrol Unbiodegraded marine oils Tazhong Uplift Tarim Basin

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The Cognitive Evolution from“Plague”to“Infectious Disease”

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Chinese Medicine and Culture 2020年第4期3卷 189-200页

作者： xi gao Department of History Fudan UniversityShanghaiChina

According to the Grand Chinese Dictionary,plague is defined to be an acute infectious *** Chinese term“infectious disease”is not what it is commonly thought originated from *** medical nomenclature shift from the traditional“plague”to the modern“infectious disease”is completed by the medical missionaries,Chinese scholars,and the national authority,each utilising different *** is a history of acceptance concerning the concept of“infectious disease”from academia to national *** conscious use of infectious disease-related thought and terminology by Chinese officials and doctors when studying infectious disease is a scientific modernization towards the understanding of *** a sense,this evolution of medical knowledge embodies the modernization of infectious disease in China.

关键词： Epidemics infectious disease modernity sanitary regulations

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Lack of Tocopherol Inhibits Rice Growth by Triggering an Ectopic Stress Response and the Accumulation of DELLA Protein

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Phyton-International Journal of Experimental Botany 2023年第4期92卷 1173-1183页

作者： Di Wang Hao gao jian Wang Baoshan Cheng Gang Li Weijun Xu xi Liu Huaiyin Institute of Agricultural Sciences in Xuhuai Region of jiangsu Huai’an223001China School of Life Sciences Huaiyin Normal UniversityHuai’an223300China Key Laboratory of Eco-Agricultural Biotechnology around Hongze Lake Regional Cooperative Innovation Center for Modern Agriculture and Environmental ProtectionHuaiyin Normal UniversityHuai’an223300China

Although tocopherols are essential for rice development,the molecular details by which their absence affects development remain to be *** study how tocopherols function during rice development,we performed a transcriptome deep sequencing(RNA-seq)analysis of the rice cultivar Nipponbare(Nip)and the tocopherol-deficient mutant small grain and dwarf 1-2(sgd1-2).We identified 563 differentially expressed genes that were enriched in Gene Ontology categories associated with metabolism,stress,cellular responses,and transcriptional *** determined that the total fatty acid composition of Nip and sgd1-2 was comparable,although cell membrane penetrability in sgd1-2 was significantly higher than in Nip under optimal growth conditions,indicating that tocopherol deficiency induces cell membrane *** expression levels of dehydration-responsive element binding 1(DREB1)genes and free proline content in sgd1-2 were also higher than those in *** also showed that the DELLA protein SLENDER RICE1(SLR1)accumulated in sgd1-2,resulting in significant changes in the global *** study confirms that the lack of tocopherol accumulation in rice induced ectopic stress responses and limited growth by enhancing SLR1 abundance through increasing SLR1 transcript *** results provide new insights into tocopherol during rice development.

关键词： Tocopherol deficiency ectopic stress response gibberellin rice

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Chinese Cyber Threat Intelligence Named Entity Recognition via RoBERTa-wwm-RDCNN-CRF

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Computers, Materials & Continua 2023年第10期77卷 299-323页

作者： Zhen Zhen jian gao School of Information Network Security People’s Public Security University of ChinaBeijing100038China Key Laboratory of Safety Precautions and Risk Assessment Ministry of Public SecurityBeijing102623China

In recent years,cyber attacks have been intensifying and causing great harm to individuals,companies,and *** mining of cyber threat intelligence(CTI)can facilitate intelligence integration and serve well in combating cyber *** Entity Recognition(NER),as a crucial component of text mining,can structure complex CTI text and aid cybersecurity professionals in effectively countering ***,current CTI NER research has mainly focused on studying English *** the limited studies conducted on Chinese text,existing models have shown poor *** fully utilize the power of Chinese pre-trained language models(PLMs)and conquer the problem of lengthy infrequent English words mixing in the Chinese CTIs,we propose a residual dilated convolutional neural network(RDCNN)with a conditional random field(CRF)based on a robustly optimized bidirectional encoder representation from transformers pre-training approach with whole word masking(RoBERTa-wwm),abbreviated as *** are the first to experiment on the relevant open source dataset and achieve an F1-score of 82.35%,which exceeds the common baseline model bidirectional encoder representation from transformers(BERT)-bidirectional long short-term memory(BiLSTM)-CRF in this field by about 19.52%and exceeds the current state-of-the-art model,BERT-RDCNN-CRF,by about 3.53%.In addition,we conducted an ablation study on the encoder part of the model to verify the effectiveness of the proposed model and an in-depth investigation of the PLMs and encoder part of the model to verify the effectiveness of the proposed *** RoBERTa-wwm-RDCNN-CRF model,the shared pre-processing,and augmentation methods can serve the subsequent fundamental tasks such as cybersecurity information extraction and knowledge graph construction,contributing to important applications in downstream tasks such as intrusion detection and advanced persistent threat(APT)attack detection.

关键词： Cybersecurity cyber threat intelligence named entity recognition

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Contributions of natural systems and human activity to greenhouse gas emissions

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Advances in Climate Change Research 2018年第4期9卷 243-252页

作者： YUE xi-Liu gao Qing-xian China Reinsurance (Group) Corporation Post-doctoral Workstation Beijing 100033 China Beijing Normal University Beijing 100875 China Chinese Research Academy of Environmental Sciences Beijing 100012 China

In this study, we conducted a literature review of relevant research and then statistically analyzed global greenhouse gas (GHG) emissions from natural systems, including forest fires, oceans, wetlands, permafrost, mud volcanoes, volcanoes, and earthquakes. Drawing on the Global Carbon Project (GCP) report, we also summarized the global anthropogenic GHG emissions. We then compared the global annual GHG emissions from natural systems with those generated by human activity. The results indicate that the global annual GHG emissions range approximately between 54.33 and 75.50 Gt CO2-eq, of which natural emissions account for 18.13e39.30 Gt CO2-eq, with the most likely value being approximately 29.07 Gt CO2-eq. According to the GCP report, the global anthropogenic emissions have increased from 22 Gt CO2-eq in 1990 to 36.2 Gt CO2-eq in 2016. The amounts of natural and anthropogenic GHGs emissions are roughly of the same order of magnitude. Anthropogenic emissions account for approximately 55.46% of the total global GHGs emissions (2016 value), i.e., the ratio of natural to anthropogenic emissions is approximately 0.8. In addition, the annual amount of GHGs absorbed by Earth systems (ocean and terrestrial ecosystems) ranges between approximately 14.4 Gt CO2-eq and 26.5 Gt CO2-eq, with natural system GHG emissions and sinks also having roughly the same order of magnitude. This finding indicates that the GHG emissions generated by human activity exert extra pressure on what is otherwise a self-balancing Earth system.

关键词： Greenhouse gases Natural emission Anthropogenic emission Global emission Natural system

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