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The international conference on mountain development in a context of global change with special focus on the Himalayas was held successfully in Kathmandu, Nepal

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Journal of Geographical Sciences 2018年第10期28卷 1560-1560,F0003页

作者： XIN Liangjie LIU linshan

The international conference on mountain development in a context of global change with special focus on the Himalayas was held in Kathmandu, Nepal on April 21-26.

关键词： The international conference on mountain development in a context of global change with special focus on the Himalayas was held successfully in Kathmandu Nepal

Cobalt-Catalyzed Intermolecular Hydroamination of Unactivated Alkenes Using NFSI as Nitrogen Source

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Chinese Journal of Chemistry 2022年第9期40卷 1066-1072页

作者： Peng-Wei Sun Ze Zhang Xinyao Wang linshan Li Yuxin Li Zhengming Li State Key Laboratory of Elemento-Organic Chemistry Research Institute of Elemento-Organic ChemistryCollege of ChemistryNankai UniversityTianjin 300071China

Cheap metal(Fe,Mn,and Co)-catalyzed hydroamination of alkenes has been an attractive method for synthesis of amines because of biocompatibility of metal,excellent Markovnikov selectivity and ***,most reports are limited to unsaturated nitrogen sources(nitric oxide,azos,azides,cyano,etc.),for which aminated products are very ***,while used widely for fluorinating reaction,N-fluorobenzenesulfonimide(NFsI)as amine source for hydroamination has seldom been *** we developed a cobalt-catalyzed intermolecular hydroamination of unactivated alkenes using NFSl as nitrogen source under mild *** reaction exhibits excellent chemo-and regio-selectivity with no hydrofluorination or linear-selectivity ***,the reaction proceeded with excellent yield even though the amount of Co(salen)catalyst was reduced to 0.2 mol%.Recently,a similar work was also reported by Zhang and coworkers(ref.19).

关键词： Hydroamination Alkenes NFSI Cobalt catalysis Mild conditions

Threshold Filtering Semi-Supervised Learning Method for SAR Target Recognition

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Computers, Materials & Continua 2022年第10期73卷 465-476页

作者： linshan Shen Ye Tian Liguo Zhang Guisheng Yin Tong Shuai Shuo Liang Zhuofei Wu Harbin Engineering University College of Computer Science and TechnologyHarbin150001China Xidian University Xi’an710000China The 54th Research Institute of CETC Shijiazhuang050000China University of Bologna Bologna40100Italy

The semi-supervised deep learning technology driven by a small part of labeled data and a large amount of unlabeled data has achieved excellent performance in the field of image ***,the existing semisupervised learning techniques are all carried out under the assumption that the labeled data and the unlabeled data are in the same distribution,and its performance is mainly due to the two being in the same distribution *** there is out-of-class data in unlabeled data,its performance will be *** practical applications,it is difficult to ensure that unlabeled data does not contain out-of-category data,especially in the field of Synthetic Aperture Radar(SAR)image *** order to solve the problem that the unlabeled data contains out-of-class data which affects the performance of the model,this paper proposes a semi-supervised learning method of threshold *** the training process,through the two selections of data by the model,unlabeled data outside the category is filtered out to optimize the performance of the *** were conducted on the Moving and Stationary Target Acquisition and Recognition(MSTAR)dataset,and compared with existing several state-of-the-art semi-supervised classification approaches,the superiority of our method was confirmed,especially when the unlabeled data contained a large amount of out-of-category data.

关键词： Semi-supervised learning SAR target recognition threshold filtering out-of-class data

Advanced Nonflammable Localized High-Concentration Electrolyte For High Energy Density Lithium Battery

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Energy & Environmental Materials 2022年第4期5卷 1294-1302页

作者： Mengmin Jia Chi Zhang Yawei Guo linshan Peng Xiaoyan Zhang Weiwei Qian Lan Zhang Suojiang Zhang CAS Key Laboratory of Green Process and Engineering State Key Laboratory of Multiphase Complex SystemsInstitute of Process EngineeringBeijing Key Laboratory of Ionic Liquids Clean ProcessChinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China School of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China School of Chemical Engineering and Technology Xi’an Jiaotong UniversityXi’an 710049China Langfang Institute of Process Engineering Chinese Academy of SciencesHebei 065001China

The key to realize long-life high energy density lithium batteries is to exploit functional electrolytes capable of stabilizing both high voltage cathode and lithium *** emergence of localized high-concentration electrolytes(LHCEs)shows great promise for ameliorating the above-mentioned interfacial *** this work,a lithium difluoro(oxalate)borate(LiDFOB)based nonflammable dual-anion LHCE is designed and *** in the mixture of trimethyl phosphate(TMP)/1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropylether(D_(2)),the continuously consumption of LiDFOB is suppressed by simply introducing lithium nitrate(LiNO_(3)).Meantime,as most of the TMP molecular are coordinated with Li^(+),the electrolyte does not show incompatibility issue between neither metal lithium nor graphite ***,it demonstrates excellent capability in stabilizing the interface of Ni-rich cathode and regulating lithium deposition *** Li||LiNi_(0.87)Co_(0.08)Mn_(0.05)O_(2)(NCM87)batteries exhibit high capacity retention of more than 90%after 200 cycles even under the high cutoff voltage of 4.5 V,1 C *** study offers a prospective method to develop safe electrolytes suitable for high voltage applications,thus providing higher energy densities.

关键词： dual-anion lithium metal battery localized high-concentration electrolyte nonflammable phosphate

Simulating potential vegetation distribution in a mountainous region of the Eastern Tibetan Plateau:A case study of Barkam County

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Chinese Journal of Population,Resources and Environment 2013年第2期11卷 180-186页

作者： Xueru Zhang Yili Zhang linshan Liu Jiping Zhang Institute of Geographic Sciences and Natural Resource Research CAS Graduate University of Chinese Academy of Sciences

The main objective of this study is to simulate the potential vegetation types on the basis of environmental *** paper took Barkam County in a mountainous region of the Eastern Tibetan Plateau as the study *** vegetation distribution was mapped in 1994 and 2007 based on TM remote sensing images by object-oriented interpretation *** overlaid the two maps to find out the vegetation patches which have not changed,and took them as stable *** per cent of the stable patches were randomly sampled to operate the logistic regression with related environmental parameters;others were used as test data of simulated *** environmental parameters were mapped,including elevation,slope,aspect,surface curvature,solar radiation,temperature and precipitation,based on DEM data and meteorological site data by GIS *** relationship between the spatial distribution of vegetation and environmental variables were quantified by logistic *** distribution probabilities of each vegetation type were ***,the spatial distribution of potential vegetation was *** research can provide a scientific basis for vegetation restoration and ecological construction in this area.

关键词： potential vegetation simulation mountainous region of the Eastern Tibetan Plateau logistic regression GIS

Bifunctional additive phenyl vinyl sulfone for boosting cyclability of lithium metal batteries

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Green Chemical Engineering 2023年第1期4卷 49-56页

作者： Xiaoyan Zhang Juyan Zhang Mengmin Jia linshan Peng Nana Zhang Suitao Qi Lan Zhang Shaanxi Key Laboratory of Energy Chemical Process Intensification School of Chemical Engineering and TechnologyXi'an Jiaotong UniversityXi'an710049China CAS Key Laboratory of Green Process and Engineering Beijing Key Laboratory of Ionic Liquids Clean ProcessInstitute of Process EngineeringChinese Academy of SciencesBeijing100190China Faculty of Engineering and Physical Sciences Department of Chemical and Process EngineeringUniversity of SurreyGuildfordGU27XHUK

One of the bottlenecks limiting the cycling stability of high voltage lithium metal batteries(LMBs)is the lack of suitable ***,phenyl vinyl sulfone(PVS)is proposed as a multifunctional additive to stabilize both cathode and anode interfaces as it can be preferentially oxidized/reduced on the electrode *** PVS derived solid electrolyte interphase films can not only reduce the transition metal dissolution on the cathode side,but also suppress the Li dendrite spread on the lithium anode *** Li||Li symmetric battery with PVS addition delivers longer cycle life and a higher critical current density of over 3.0 m Ah cm^(-2).The LiNi_(0.8)Co_(0.1)Mn0.1O_(2)(NCM811)||Li full cell exhibits excellent capacity retention of 80.8%or 80.0%after 400 cycles at 0.5 C or 1 C rate with the voltage range of 3.0–4.3 *** particular,the NCM811||Li cell under constrained conditions remains operation over 150 *** work offers new insights into the electrolyte formulations for the next generation of LMBs.

关键词： Lithium metal battery Ni-rich cathode Phenyl vinyl sulfone Dendrite

A molecular brake hoop for the motion of metal atoms inside fullerene cage

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Science China Chemistry 2022年第8期65卷 1601-1606页

作者： Yuxi Lu Chong Zhao Jie Zhang Wang Li Jiayi Liang linshan Liu Yongguang Li Chunru Wang Taishan Wang Beijing National Laboratory for Molecular Sciences Key Laboratory of Molecular Nanostructure and NanotechnologyInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China School of Pharmacy Guizhou Medical UniversityGuian New District 550025China College of Material Chemistry and Chemical EngineeringHangzhou Normal UniversityHangzhou 311121China

Molecular machines have attracted extensive attention due to their fancy concept and their potential to influence the science and *** dynamic motion of encapsulated metallic clusters is a distinctive character for endohedral *** the development of molecular rotors based on metallofullerenes,the most challenging issue is how to control the motion of untouchable metallic cluster inside fullerene *** this work,we report a molecular brake hoop for the motion of metal atoms inside fullerene cage.A cycloparaphenylene of[12]CPP was employed to hoop the metallofullerene and produce two supramolecular complexes of Sc_(3)N@C_(80)⊂[12]CPP and Sc_(2)C_(2)@C_(82)⊂[12]***,the temperature-dependent ^(45)Sc nuclear magnetic resonance spectroscopy(NMR)was employed to detect the motion of internal Sc_(3)N and Sc_(2)C_(2) clusters.^(45)Sc NMR results reveal that the[12]CPP can slow down the rotation of internal metallic cluster through host-guest interaction,and thus the[12]CPP can be considered as a molecular brake hoop for the internal metal motion of ***,by means of this molecular brake hoop,the motion of metal atoms inside fullerene cage have expanded range of *** addition,theoretical calculations on Sc_(3)N@C_(80)⊂[12]CPP were executed to illustrate the molecular orientation as well as internal Sc_(3)N *** study would promote the research of endohedral metallofullerene as a molecular rotor.

关键词： metallofullerene molecular rotor molecular brake supramolecular complex dynamic motion

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Synergistic modulation of spin and fluorescence signals in a nano-Saturn assembled by a metallofullerene and cycloparaphenylene nanohoop

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Nano Research 2023年第2期16卷 3372-3378页

作者： Jie Zhang Zhenlin Qiu Chong Zhao Yuxi Lu Wang Li linshan Liu Chunru Wang Yuanzhi Tan Taishan Wang Beijing National Laboratory for Molecular Sciences Key Laboratory of Molecular Nanostructure and NanotechnologyInstitute of ChemistryChinese Academy of SciencesBeijing 100190China State Key Laboratory for Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materialsand Department of Chemistry College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China University of Chinese Academy of Sciences Beijing 100049China School of Pharmacy Guizhou Medical UniversityGuiyang 550025China

Spin-based interdisciplinary research has attracted considerable attention,and various applications in magnetic memory,quantum science,and precision measuring technology have been *** this study,we induced a fluorescence property in a spin-active molecule by supramolecular assembly and realized a synergistic modulation of its spin and fluorescence properties.A Saturn-shaped supramolecular complex was synthesized using a spin-active metallofullerene Sc_(3)C_(2)@C80 with a fluorescent nanohoop of tetra-benzothiadiazole-based[12]cycloparaphenylene(TB[12]CPP),and its spin and fluorescence properties were comprehensively ***-dependent electron paramagnetic resonance(EPR)spectroscopy and fluorescence analyses were *** changes in the EPR signals and fluorescence peaks were discovered in the temperature range of 170–290 *** on nuclear magnetic resonance observations and theoretical calculations,a temperature-dependent host–guest interaction between Sc_(3)C_(2)@C_(80)and a nanohoop was demonstrated,which explained the synchronous changes in the EPR signals and fluorescence peaks for Sc_(3)C_(2)@C_(80)⊂TB[12]*** application of Sc_(3)C_(2)@C_(80)as a molecular spin system to probe the host–guest interaction was also *** results show that the supramolecular assembly can be used to design advanced spin systems coupled with optical and magnetic behaviors based on paramagnetic and luminescent molecules.

关键词： metallofullerene nanohoop electron spin fluorescence host–guest interaction

Vegetation change in the Mt. Qomolangma Nature Reserve from 1981 to 2001

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Journal of Geographical Sciences 2007年第2期17卷 152-164页

作者： ZHANG Wei ZHANG Yili WANG Zhaofeng DING Mingjun yang Xuchao LIN Xuedong LIU linshan Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China Institute of Tibetan Plateau Research CAS Beijing 100085 China

Based on the NOAA AVHRR-NDVI data from 1981 to 2001, the digitalized China Vegetation Map （1：1,000,000）, DEM, temperature and precipitation data, and field investigation, the spatial patterns and vertical characteristics of natural vegetation changes and their influencing factors in the Mt. Qomolangma Nature Reserve have been studied. The results show that：（1） There is remarkable spatial difference of natural vegetation changes in the Mt. Qomolangma Nature Reserve and stability is the most common status. There are 5.04% of the whole area being seriously degraded, 13.19% slightly degraded, 26.39% slightly improved, 0.97% significantly improved and 54.41% keeping stable. The seriously and slightly degraded areas, which mostly lie in the south of the reserve, are along the national boundaries. The areas of improved vegetation lie in the north of the reserve and the south side of the Yarlung Zangbo River. The stable areas lie between the improved and degraded areas. Degradation decreases with elevation. （2） Degeneration in the Mt. Qomolangma Nature Reserve mostly affects shrubs, needle-leaved forests and mixed forests. （3） The temperature change affects the natural vegetation changes spatially while the integration of temperature changes, slopes and aspects affects the natural vegetation change along the altitude gradients. （4） It is the overuse of resources that leads to the vegetation degeneration in some parts of the Mt. Qomolangma Nature Reserve.

关键词： Mt. Qomolangma (Everest) nature reserve AVHRR vegetation degradation Himalayas