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Mapping the Past with Present Digital Tools:Historic Urban Landscape Research in Chinese City,Xi’an Walled City Area

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Built Heritage 2018年第4期2卷 42-57页

作者： Xi Wang Feng Han xiaozhe bian Zhifeng Li College of Architecture and Urban Planning Tongji UniversityShanghaiChina

In 2015,the Study of Xi’an Historic Walled City Regeneration Strategy applied the Historic Urban Landscape(HUL)Approach through experimenting and testing digital technologies following recommended action steps of HUL *** the context of urbanisation and heritage deterioration happened past decades in Chinese cities,this paper proposes an innovative HUL Information System that can be used to integrate the approach and technical support *** enables comprehensive identification of spatial-temporal relativity of urban landscape morphology,linking between the past and *** use of spatial digital tools such as aerial photo modeling,geographic information system analysis,and space syntax is explored to trace the continuity of the historical landscape in the built *** research team uncovered the context of Xi’an’s cultural and historical landscape through historical literature and related studies over past decades,and summarised and obtained a spatial data set for the dominant historical landscape pattern of the walled city *** with the existing spatial pattern identified by digital tools,the findings showed similarity with historical landscape patterns,including part of a fengshui landform,the 17^(th) to 19^(th) century water system,and an evolving community *** could be explained by the literature and academic research,which demonstrates the influence of historic landscape system in urban *** research aims to show the potential of the HUL Information System as a technical support for urban conservation in Chinese cities,particularly with regard to mapping resources,which is fundamental toward other relevant steps in the HUL approach.

关键词： cultural landscape urban heritage HUL approach information system digital mapping relativity

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改进RT-DETR的无人机图像目标检测算法

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计算机工程与应用 2025年第1期61卷 98-108页

作者：姜贸翔司占军王晓喆天津科技大学人工智能学院天津300457 北京航空航天大学无人系统研究院北京100191

针对轻小型无人机图像目标检测中由于目标灵活多样、环境复杂多变导致的检测精度低等问题,提出基于改进RT-DETR无人机目标检测算法。综合考虑轻量级SimAM注意力和倒置残差模块改进ResNet-r18主干网络,提高目标检测模型的特征提取能力。... 详细信息

针对轻小型无人机图像目标检测中由于目标灵活多样、环境复杂多变导致的检测精度低等问题,提出基于改进RT-DETR无人机目标检测算法。综合考虑轻量级SimAM注意力和倒置残差模块改进ResNet-r18主干网络,提高目标检测模型的特征提取能力。采用级联分组注意力机制优化倒置残差模块和特征交互模块,提升特征选择能力,实现目标检测信息的精细化获取。颈部网络中引入160×160检测层,提升特征融合阶段小目标的感知能力。基于VisDrone2019数据集的实验结果表明,改进后的模型具有更低的参数量和更高的检测精度。在Alver_Lab_Ulastirma和HIT-UAV数据集上进一步验证了改进方法的有效性和鲁棒性。

关键词：小目标检测 DETR 注意力机制 Transformer 残差链接

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Polymer brushes on hydrogen-terminated silicon substrates via stable Si--C bond

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Chinese Chemical Letters 2018年第1期29卷 171-174页

作者： Hang bian xiaozhe Dong Shanshan Chen Dewen Dong Ning Zhang School of Material Science and Engineering Jilin jianzhu University Changchun 130118 China Key Laboratory of Synthetic Rubber Changchun Institute of Applied ChemistryChinese Academy of Sciences Changchun 130022. China

We demonstrate a straightforward and efficient method for the creation of polymer brushes on hydrogen-terminated silicon substrates through the UV-induced photopoiymerization. The surface grafting polymerization is applicable to a series of monomers, allowing the direct formation of homogeneous polymer coatings ranging from hydrophilic poly（2-isopropenyl-2-oxazoline）（PIPOx）, amphiphilic poly（N-isopropyl acrylamide）（PNIPAM）, to hydrophobic polystyrene （PS） and poly（4- （1H,1H,2H,2H-perfiuorohexyl）oxymethylstyrene）（PPHMS） on Si（100） and Si（lll） surfaces via stable Si--C bonds. Polymerization kinetic investigation indicates a linear increase of polymer layer thickness with the polymerization time. Moreover, the as-prepared polymer brushes exhibit superior stability against basic conditions in contrast to those that were formed on silicon substrates via conventional Si--O--C bond.

关键词： Polymer brushesSilicon substratesSIPGPSurface wettabilitySurface functionalization

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Reliability analysis of reinforced concrete columns under combined seismic and blast loads

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Science China(Technological Sciences) 2023年第2期66卷 363-377页

作者： SHI YanChao SUN xiaozhe CUI Jian Key Laboratory of Coast Civil Structure Safety of Ministry of Education Tianjin UniversityTianjin 300354China School of Civil Engineering Tianjin UniversityTianjin 300354China

It is possible for certain building structures to encounter both the seismic load and blast load during their service *** the development of the economy and the increase of security demand,the need for design of building structures against multi-hazard is becoming more and more ***,the damage analysis of building structures under the combined action of multiple hazards has become a very urgent requirement for disaster prevention and *** this paper,the refined finite element model of reinforced concrete(RC)columns is established by using the explicit dynamic analysis software *** with the Monte Carlo method,the damage law of RC columns under the combined action of random single earthquake or explosion disaster and multi-hazard is studied,and the damage groups are distinguished according to the damage *** on the support vector machine(SVM)algorithm,the dividing line between different damage degree groups is determined,and a rapid method for determining the damage degree of RC columns under the combined seismic and blast loads is ***,suggestions for the design of RC column against multi-disaster are put forward.

关键词： reliability analysis reinforced concrete(RC)column damage probability seismic load blast load Monte-Carlo method

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THE SHIFTED-INVERSE POWER WEAK GALERKIN METHOD FOR EIGENVALUE PROBLEMS

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Journal of Computational Mathematics 2020年第4期38卷 606-623页

作者： Qilong Zhai xiaozhe Hu Ran Zhang Department of Mathematics Peking UniversityBeijing 100871China Department of Mathematics Tufts UniversityMedford02155USA Department of Mathematics Jilin UniversityChangchun 130012China

This paper proposes and analyzes a new weak Galerkin method for the eigenvalue problem by using the shifted-inverse power technique.A high order lower bound can be obtained at a relatively low cost via the proposed *** error estimates for both eigenvalue and eigenfunction are provided and asymptotic lower bounds are shown as well under some *** examples are presented to validate the theoretical analysis.

关键词： Weak Galerkin finite element method Eigenvalue problem Shifted-inverse power method Lower bound

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Estimation of provincial forest carbon sink capacities in Chinese mainland

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Chinese Science Bulletin 2011年第9期56卷 883-889页

作者： MA xiaozhe WANG Zheng ECNU Key Laboratory of Geographic Information ScienceMinistry of EducationEast China Normal UniversityShanghai 200062China Institute of Policy and Management Chinese Academy of SciencesBeijing 100190China Institute of Geographical Science Henan Academy of SciencesZhengzhou 450052China

Estimation of the capacity of provincial forest carbon sinks in Chinese mainland using the CO2FIX model provides data support for the effective management of provincial regions. According to China’s Sixth National Forest Inventory, we estimate the capacities of original and new afforestation carbon sinks under the assumption of using the country’s non-forest land for afforestation and reforestation to achieve a new forested area of 57323200 ha. The carbon absorption capacity of China’s forest ecosystems estimated from 2005 to 2050 reaches 8.4 GtC. The absorption capacities of original forest and new afforestation respectively are 4.9 and 3.5 GtC. The annual capacity of all forest carbon sinks has a roughly decreasing trend. Inner Mongolia Autonomous Region, Yunnan, Sichuan and Heilongjiang provinces make major contributions to the carbon sink capacity.

关键词：森林资源连续清查吸收能力中国大陆碳估算森林生态系统内蒙古自治区 ities

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Integrated optimization on aerodynamics-structure coupling and flight stability of a large airplane in preliminary design

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Chinese Journal of Aeronautics 2018年第6期31卷 1258-1272页

作者： xiaozhe WANG Zhiqiang WAN Zhu LIU Chao YANG School of Aeronautic Science and Engineering Beihang University Key Laboratory of Aircraft Advanced Design Technology Ministry of Industry and Information

The preliminary phase is significant during the whole design process of a large airplane because of its enormous potential in enhancing the overall performance. However, classical sequential designs can hardly adapt to modern airplanes, due to their repeated iterations, long periods, and massive computational burdens. Multidisciplinary analysis and optimization demonstrates the capability to tackle such complex design issues. In this paper, an integrated optimization method for the preliminary design of a large airplane is proposed, accounting for aerodynamics, structure, and stability. Aeroelastic responses are computed by a rapid three-dimensional flight load analysis method combining the high-order panel method and the structural elasticity correction. The flow field is determined by the viscous/inviscid iteration method, and the cruise stability is evaluated by the linear small-disturbance theory. Parametric optimization is carried out using genetic algorithm to seek the minimal weight of a simplified plate-beam wing structure in the cruise trim condition subject to aeroelastic, aerodynamic, and stability constraints, and the optimal wing geometry shape, front/rear spar positions, and structural sizes are obtained simultaneously. To reduce the computational burden of the static aeroelasticity analysis in the optimization process, the Kriging method is employed to predict aerodynamic influence coefficient matrices of different aerodynamic shapes. The multidisciplinary analyses guarantee computational accuracy and efficiency, and the integrated optimization considers the coupling effect sufficiently between different disciplines to improve the overall performance, avoiding the limitations of sequential approaches utilized currently.

关键词： Aeroelasticity Integrated optimization Multidisciptinary analysis Large airplane Preliminary design

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Accelerated Move for AI Education in China

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ECNU Review of Education 2019年第3期2卷 347-352页

作者： xiaozhe Yang Institute of Curriculum and Instruction East China Normal University

Purpose:This article summarizes recent developments in the use of artificial intelligence(AI)in Chinese education,paying particular attention to the different applications of AI at a number of different *** article reviews key government policies and guidelines and suggests a course for future ***/Approach/Methods:The article analyzes key government policies relevant to the implementation of AI in Chinese ***,the article leverages the author’s experience as a key member of national information technology curriculum development,which involved participation in the drafting of various curriculum standards and policy documents and discussions with numerous administrative officials,teachers,and ***:This article argues that the use of AI in Chinese education varies at different *** implementation is at its early stage in elementary education;more prevalent in higher education,and even more common in the field of civic *** a result,in multiple dimensions,Chinese students are becoming better trained to face an age of AI and working together to create an informatized education ***/Value:This article describes how China is searching for the point where top-down system design meets bottom-up applications to chart its own course for the use of AI in education.

关键词： Artificial intelligence(AI) China education

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Teachers’Perceptions of Large-Scale Online Teaching as an Epidemic Prevention and Control Strategy in China

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ECNU Review of Education 2020年第4期3卷 739-744页

作者： xiaozhe Yang Faculty of Education Institute of Curriculum and InstructionEast China Normal University3663 North Zhongshan RoadShanghaiChina

The sudden outbreak of the novel coronavirus disease(COVID-19)in China resulted in the sudden closure of schools,interrupting teaching *** prevent the virus from spreading across campuses and ensure the safety of teachers and students,China’s Ministry of Education(MOE)closed all educational ***,the MOE mandated that schools of all types and at all levels“retain the education program despite the suspension of classes”by adapting solutions to local conditions.

关键词： COVID-19 large scale online education teachers in China

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Application of auxiliary space preconditioning in field-scale reservoir simulation

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Science China Mathematics 2013年第12期56卷 2737-2751页

作者： HU xiaozhe XU JinChao ZHANG ChenSong Department of Mathematics The Pennsylvania State University University ParkPA 16802 USA LSEC and NCMIS Academy of Mathematics and Systems ScienceChinese Academy of Sciences

We study a class of preconditioners to solve large-scale linear systems arising from fully implicit reservoir simulation. These methods are discussed in the framework of the auxiliary space preconditioning method for generality. Unlike in the case of classical algebraic preconditioning methods, we take several analytical and physical considerations into account. In addition, we choose appropriate auxiliary problems to design the robust solvers herein. More importantly, our methods are user-friendly and general enough to be easily ported to existing petroleum reservoir simulators. We test the efficiency and robustness of the proposed method by applying them to a couple of benchmark problems and real-world reservoir problems. The numerical results show that our methods are both efficient and robust for large reservoir models.

关键词： reservoir simulation black-oil model fully implicit method auxiliary space preconditioning algebraic multigrid method Krylov subspace iterative method

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