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Evaluation method and empirical application of human activity suitability of land resources in Qinghai-Tibet Plateau

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Journal of Geographical Sciences 2023年第7期33卷 1397-1418页

作者： XU Yong wang lijia YANG Hua Key Laboratory of Regional Sustainable Development Modelling Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

The current suitability evaluation methods for land resources human activity in China suffer from theoretical deficiencies related to fundamental data accuracy,elevation and slope classification,and suitability class *** application of these methods is also hindered by excessive evaluation indicators,data acquisition difficulties,and limited applicability to high altitude *** address these issues,this paper proposes a technical evaluation framework for the Qinghai-Tibet Plateau(QTP) that employs selected key parameters varying with elevation and slope to establish grid-scale evaluation models for construction land suitability(CLS) and arable land suitability(ALS).A generalized algorithm is then proposed for key parameters such as air density,air temperature,slope suitability for construction,and soil erosion resistance of sloping arable *** research is conducted using Milin County in southeast Tibet as a case study,with interval measurements of 100 m in elevation and 1° in *** evaluation model is tested using grid accuracies of 30 m,50 m,100 m,250 m,500 m,and 1000 *** results reveal that:Firstly,the CLS and ALS can be categorized into five classes:highly suitable,suitable,moderately suitable,marginally suitable,and unsuitable,with varying area ratios under different grid ***,existing construction lands in Milin County are mainly distributed in suitable,highly suitable,and moderately suitable CLS classes,accounting for over 94% of the total area studied under different grid *** arable land is mainly distributed in suitable,highly suitable,and moderately suitable ALS classes,accounting for over 96%.Thirdly,the empirical research in Milin County indicates that the evaluation method,quantitative model,and parameters algorithm for evaluating human activity suitability of land resources on the QTP are feasible and applicable,with a recommended grid accuracy within 100 m and a maximum of 250 ***,t

关键词： human activity evaluation model construction land suitability arable land suitability land resource Qinghai-Tibet Plateau

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Sidearm Modified Bisoxazoline Ligands and Their Applicationst

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Chinese Journal of Chemistry 2018年第12期36卷 1123-1129页

作者： lijia wang Jian Zhou Yong Tang The State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of Sciences345 Lingling RoadShanghai 200032China School of Chemistry East China Normal University3663N Zhongshan RoadShanghai 300062China

Developing novel and highly efficient chiral ligands is the eternal theme in chiral catalysis research, since none of ligands or catalysts is universal for all the reactions. We are aiming at searching for a facile and effective strategy in developing new chiral ligands that could be employed in a broad range of asymmetric reactions. By introducing additional (sidearm) groups to a classic chiral ligand, both the electron nature and steric environment of the catalyst could be adjusted, and thus the reactivity, selectivity and functional group tolerance of a catalyst could be modulated. Based on this strategy, a variety of sidearm modified bisoxazoline ligands have been designed and developed, including TOX, SaBOX, diSaBOX and Wing‐BOX. The account presents a brief introduction on their discovery and representative applications.

关键词： chiral ligands enantioselective bisoxazoline asymmetric catalysis sidearm

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View-invariant Gait Authentication Based on Silhouette Contours Analysis and View Estimation

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IEEE/CAA Journal of Automatica Sinica 2015年第2期2卷 226-232页

作者： Songmin Jia lijia wang Xiuzhi Li College of Electronic Information&Control Engineering Beijing University of Technology Department of Information Engineering and Automation Hebei College of Industry and Technology

In this paper, we propose a novel view-invariant gait authentication method based on silhouette contours analysis and view estimation. The approach extracts Lucas-Kanade based gait flow image and head and shoulder mean shape (LKGFI-HSMS) of a human by using the Lucas-Kanade0s method and procrustes shape analysis (PSA). LKGFI-HSMS can preserve the dynamic and static features of a gait sequence. The view between a person and a camera is identified for selecting the target's gait feature to overcome view variations. The similarity scores of LKGFI and HSMS are calculated. The product rule combines the two similarity scores to further improve the discrimination power of extracted features. Experimental results demonstrate that the proposed approach is robust to view variations and has a high authentication rate. © 2014 Chinese Association of Automation.

关键词： Authentication Gait analysis Image analysis Rapid thermal annealing

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A new ophiolitic mélange containing boninitic blocks in Alxa region:Implications for Permian subduction events in southern CAOB

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Geoscience Frontiers 2018年第5期9卷 1355-1367页

作者： Rongguo Zheng Jinyi Li Wenjiao Xiao lijia wang Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China Xinjiang Research Center for Mineral Resources Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China CAS Center for Excellence in Tibetan Plateau Earth Science Chinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

The Alxa region, located in the southernmost part of Central Asian Orogenic Belt, is a key region for understanding the tectonic processes associated with the closure of the Paleo-Asian Ocean. Issues of late Paleozoic tectonic settings and tectonic unit divisions of the Alxa region still remain controversial. In this study, we report a new ophiolitic mélange named the Tepai ophiolitic mélange in the northern Alxa region, northwest of Alxa Youqi. The tectonic blocks in the Tepai ophiolitic mélange are mainly composed of serpentinized peridotites, serpentinites, mylonitized gabbros, gabbros, basalts, and quartzites, with a matrix comprising highly deformed clastic rocks. A gabbro exhibits a zircon LA-ICP-MS Ue Pb age of278.4 ± 3.3 Ma. Gabbros exhibit high Mg O and compatible element contents, but extremely low TiO_2,totally rare earth element and high field strength element contents. These rocks exhibit light rare earth element depleted patterns, and display enriched in large-ion lithophile elements and depleted in high field strength elements. Boninite-like geochemical data show that they were formed in a subductionrelated environment, and derived from an extremely depleted mantle source infiltrated by subduction-derived fluids and/or melts. The Tepai ophiolitic mélange exhibits similar zircon U-Pb-O isotopic compositions and whole-rock geochemical characteristics to those of the Quagan Qulu ***, we propose that the Tepai ophiolitic mélange may have been the western continuation of the Quagan Qulu ophiolite. Our new finding proves the final closure of the Paleo-Asian Ocean might have taken place later than the early Permian.

关键词： Alxa region CAOB Ophiolite LA-ICP MS U-Pb Oxygen isotope

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Fulfilling Set Objectives:A Case Study of Teacher Development in Two Primary Schools in Beijing

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ECNU Review of Education 2019年第2期2卷 178-195页

作者： Manhong Lai lijia wang The Chinese University of Hong Kong East China Normal University

Purpose:This study aims to reveal the recent characteristics of school-based teacher development(STD)in China since it is perceived as a key measure to achieve success in raising educational quality in the ***/Approach/Methods:A qualitative research approach with in-depth interviews of 18 teachers at two primary schools in Beijing was ***:Through the lens of cultural-historical activity theory(CHAT),it was observed that the objectives adaptation of teacher communities was made under the control of the District Education *** provides the venue for ordinary teachers to learn,understand,and implement the teaching initiatives promoted by the *** communities at school level therefore implement continuous professional development initiatives promoted by Education Bureau teaching research ***/Value:This article argues that the administrative style of local government affected teacher community’s object,rules,and division of *** also contributes an indigenous interpretation of the CHAT theory.

关键词： Collective lesson preparation cultural-historical activity theory primary school teacher development teaching research officer

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Influence of grain size on twinning behavior of WE43 magnesium alloy during room-temperature compression deformation

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Journal of Rare Earths 2024年第12期42卷 2285-2292页

作者： lijia wang Sha Zhan Yutao Ruan Tianhu Miao Li Hu College of Material Science and Engineering Chongqing University of Technology Sichuan Lab of Engineering Aeronautical Materials Inspection and Die-forging Technology Sichuan Engineering Technical College

In the present study, room-temperature compression experiments and characterization experiments via optical microstructure(OM), X-ray diffractometer(XRD) and electron backscattered diffraction(EBSD)techniques were conducted on WE43 magnesium(Mg) alloy samples to investigate the grain size effect on twinning behavior. Three couples of solution treatments(823 K for 0.5 h, 798 K for 8 h, 823 K for 16 h,followed by water-quenching at ～333 K) were adopted and these solutionized samples are with different grain sizes of 48.5, 72.0 and 120.2 μm, respectively. Results show that {10-12} extension twin(ET) and {11-21} ET serve as major twinning modes during plastic deformation. For all 7.7%-deformed samples, although the volume fractions of {10-12} ETs and {11-21} ETs increase with the increasing grain size. {10-12} ETs are in growth stage, while {11-21} ETs are mainly in nucleation stage and they still maintain narrow and parallel to each other. Besides, {10-12} ETs mainly contribute to the rotation of caxes of grains towards compression direction, while {11-21} ETs mainly contribute to the formation of a nearly ring-shaped texture component in(0002) pole figure. Twin variants analysis with the assistance of Schmid factor(SF) demonstrates that the activation of twin variants mainly obeys Schmid law. When only {10-12} ETs occur in individual grains, the maximum number of twin variants shows some positive relationship with the increasing grain size. By comparison, when both {10-12} ETs and {11-21} ETs occur in individual grains, the maximum numbers of twin variants are rarely influenced by the increasing grain size.

关键词： Grain size effect Microstructure characteristics Rare earths Twinning behavior WE43 magnesium alloy

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Evaluation of suitability,adaptability,and reserve potential of construction land on the Qinghai-Tibet Plateau

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Journal of Geographical Sciences 2024年第1期34卷 41-61页

作者： YANG Hua XU Yong ZHOU Kan wang lijia XU Lin Key Laboratory of Regional Sustainable Development Modeling Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

Construction land is the leading carrier of human activities such as production and *** the construction land suitability(CLS)on the Qinghai-Tibet Plateau(QTP)holds significant implications for harmonizing the relationship between ecological protection and human activity and promoting population and industry layout ***,no relevant studies provide a complete CLS assessment of the *** this study,we developed a model-based CLS evaluation framework coupling of pattern and process to calculate the global CLS on the QTP based on a previously developed CLS evaluation ***,using the land-use data of 1990,2000,2010,and 2020,we examined the adaptability of existing construction land(ECL)to the CLS assessment result through the adaptability index and vertical gradient index and further analyzed the limitations of maladaptive construction ***,we calculated the potential area of reserve suitable construction *** article includes four conclusions:(1)The highly suitable,suitable,moderately suitable,marginally suitable,and unsuitable CLS classes cover areas of 0.33×10^(4)km^(2),10.42×10^(4)km^(2),18.06×10^(4)km^(2),24.12×10^(4)km^(2),and 205.29×10^(4)km^(2),*** approximately 11%of the study area on the QTP is suitable for large-scale permanent construction land,and approximately 79.50%of the area is unsuitable under current economic and technological conditions.(2)The ECL adaptability index is 85.16%,85.93%,85.18%,and 78.01%during 1990–2020,respectively,with an average adaptability index exceeding 80%on the *** ECL distribution generally conforms to construction land suitable space characteristics but with a significant spatial difference.(3)From 1990 to 2020,the maladaptive ECL was dominated by rural settlement land,transport land,and special land,with a rapidly increasing proportion of urban and other construction *** maladaptive ECL is constrained by both elevation and slope in the southern Qinghai Pla

关键词： land resource construction land suitability existing construction land adaptability human activity Qinghai-Tibet Plateau

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Highly Stereoselective Direct Construction of Diaryl-Substituted Cyclobutanes

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Chinese Journal of Chemistry 2020年第3期38卷 259-262页

作者： Xiang-Yang Song Liu-Peng Zhao lijia wang Yong Tang State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesUniversity of Chinese Academy of Sciences345 Lingling LuShanghai 200032China Shanghai Key Laboratory of Green Chemistry and Chemical Processes Department of ChemistryEast China Normal University3663 North Zhongshan RoadShanghai 200062China

A copper catalyzed stereoselective[2+2]cyclization has been developed,providing a concise protocol to the direct construction of diaryl-substituted cyclobutanes in up to 99%yield with up to>95/5 ***,the enantioselective version of this reaction has also been achieved,leading to a series of optically active diaryl-substituted cyclobutanes with up to 94%ee.

关键词： substituted butane Highly

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Visible-Light-Promoted[3+2]Cycloaddition of 2H-Azirines with Quinones:Access to Substituted Benzo[f]isoindole-4,9-diones

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Chinese Journal of Chemistry 2022年第6期40卷 719-724页

作者： lijia wang Chuang Liu Lei Li Xin wang Ran Sun Ming-Dong Zhou He wang School of Petrochemical Engineering Liaoning Petrochemical UniversityFushunLiaoning 113001China

A visible-light-promoteded[3+2]cycloaddition reaction of 2H-azirines with quinones has been developed under mild reaction *** reaction provides a general and efficient strategy for the synthesis of the benzo[f]isoindole-4,9-diones scaffold via a tandem[3+2]cyclization/oxidative aromatization with molecular ***,preliminary studies for photocatalytic prop-erties show that the benzo[f]isoindole-4,9-diones 3 can be used as photocatalysts in several organic transformations.

关键词： Photocatalysis Cycloaddition Quinones 2H-Azirines Benzo[f]isoindole-4,9-diones

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Copper Catalyzed Asymmetric [4＋2] Annulations of D-A Cyclobutanes with Aldehydes

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Chinese Journal of Chemistry 2018年第1期36卷 47-50页

作者： Jiang-Lin Hu Li Zhou lijia wang Zuowei Xie Yong Tang The State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 China Shanghai-Hong Kong Joint Laboratory in Chemical Synthesis Shanghai Institute of Organic Chemistry Chinese Academy of Sciences 345 Lingling RoadShanghai 200032 China Collaborative Innovation Center of Chemical Science and Engineering Tianjin China

Copper catalyzed enantioselective [4＋2] annulations of D-A cyclobutanes and aldehydes have been developed. In the presence of a side arm modified chiral bisoxazoline （SaBOX） ligand, the [4＋2] annulations proceeded smoothly with a broad substrate scope. 22 examples were studied, leading to the corresponding products with various functional groups in 41%-99% yields with 〉99/1 dr and 90%-96% ee. The resulting product with two ester groups was mono-reduced, giving the corresponding product in excellent diastereoselectivity without loss of the enantiopurity.

关键词： [4+2] annulation cyclobutane enantioselective copper bisoxazoline

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