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全龄友好理念下小微公共空间的包容性设计与建设研究

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世界建筑 2024年第6期 25-29页

作者：汪丽君刘天宇天津大学建筑学院天津大学建筑学院建筑系天津市健康人居环境与智慧技术重点实验室天津大学

小微公共空间是居民日常高频次使用的空间类型,因其中多元人群需求复杂,存在公平性低、易用性差、开放性不足等设计排斥性问题。本文基于全龄友好理论发展,提出公平性、易用性、开放性3项小微公共空间包容性设计原则。通过研究公平和谐... 详细信息

小微公共空间是居民日常高频次使用的空间类型,因其中多元人群需求复杂,存在公平性低、易用性差、开放性不足等设计排斥性问题。本文基于全龄友好理论发展,提出公平性、易用性、开放性3项小微公共空间包容性设计原则。通过研究公平和谐、易用友好、社交促进3种模式小微公共空间的建设实践,对营建全龄友好小微公共空间提出建议。

关键词：全龄友好需求适配代际融合小微公共空间包容性设计

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濉溪县沱浍澥灌区水源条件研究

安徽水利水电职业技术学院学报 2024年第2期24卷 1-4页

作者：王利军王丽娟安徽省水利水电勘测设计研究总院有限公司安徽合肥230008 安徽水利水电职业技术学院安徽合肥231603

文章从濉溪县水土资源条件出发,结合境内水利基础设施条件,分析灌区水源条件,得出该区具备发展井河结合灌区的结论,保证了粮食的达产与增产。

关键词：水源条件地下水井渠灌区

Solid–liquid equilibrium of dimethyl terephthalate(DMT), dimethyl isophthalate(DMI) and dimethyl phthalate(DMP) in melt crystallization process

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Chinese Journal of Chemical Engineering 2017年第12期25卷 1735-1739页

作者： Chunyuan Wu Youwei Cheng lijun wang Xi Li Department of Chemical and Biological Engineering Zhejiang University Hangzhou 310027 China

The binary solid-liquid equilibrium of Dimethyl Terephthalate （DMT）, Dimethyl lsophthalate （DMI） and Dimeth- yl Phthalate （DMP） was investigated by experiment and differential scanning calorimetry （DSC）. The result demonstrated DMT/DMI and DMT/DMP systems are eutectic while DMI/DMP is a solid-solution system. The eutectic temperature of DMT/DMI system is 336.7 K and that of DMT/DMP is 271.1 K. Furthermore, a classical solid-liquid phase equilibrium model was used to fit the experimental data of the eutectic systems of DMT/DMI and DMT/ DMP and the theoretical model could describe the eutectic solid-liquid phase diagrams properly.

关键词： Solid-liquid equilibrium Differential scanning calorimetry Eutectic Solid-solution Phase equilibrium model

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机械除草技术装备应用调研及发展建议

农业工程 2024年第9期14卷 19-22页

作者：李世柱王立军黑龙江省农业机械工程科学研究院黑龙江哈尔滨150081

除草技术装备是农业生产中不可缺少的农具。通过查阅资料、电话访谈、企业座谈和实地观摩等方式,针对除草技术装备开展了深入调查研究。分析了机械除草节本增效情况、国内机械除草装备推广应用情况及高端智能除草装备研发进展情况等,剖... 详细信息

除草技术装备是农业生产中不可缺少的农具。通过查阅资料、电话访谈、企业座谈和实地观摩等方式,针对除草技术装备开展了深入调查研究。分析了机械除草节本增效情况、国内机械除草装备推广应用情况及高端智能除草装备研发进展情况等,剖析了黑龙江省智能除草装备应用存在的主要问题及原因,在此基础上提出了发展建议对策。

关键词：机械除草除草装备种植成本智能装备除草机器人

Evaluation of a deep-learning model for multispectral remote sensing of land use and crop classification

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The Crop Journal 2022年第5期10卷 1435-1451页

作者： lijun wang Jiayao wang Zhenzhen Liu Jun Zhu Fen Qin Henan Industrial Technology Academy of Spatio-Temporal Big Data Henan UniversityKaifeng 475004HenanChina College of Geography and Environmental Science Henan UniversityKaifeng 475004HenanChina Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions Ministry of EducationHenan UniversityKaifeng 475004HenanChina Key Research Institute of Yellow River Civilization and Sustainable Development Ministry of EducationHenan UniversityKaifeng 475004HenanChina Henan Technology Innovation Center of Spatial-Temporal Big Data Henan UniversityKaifeng 475004HenanChina

High-resolution deep-learning-based remote-sensing imagery analysis has been widely used in land-use and crop-classification mapping. However, the influence of composite feature bands, including complex feature indices arising from different sensors on the backbone, patch size, and predictions in transferable deep models require further testing. The experiments were conducted in six sites in Henan province from2019 to 2021. This study sought to enable the transfer of classification models across regions and years for Sentinel-2 A(10-m resolution) and Gaofen PMS(2-m resolution) imagery. With feature selection and up-sampling of small samples, the performance of UNet++ architecture on five backbones and four patch sizes was examined. Joint loss, mean Intersection over Union(m Io U), and epoch time were analyzed, and the optimal backbone and patch size for both sensors were Timm-Reg Net Y-320 and 256 × 256, respectively. The overall accuracy and Fscores of the Sentinel-2 A predictions ranged from 96.86% to 97.72%and 71.29% to 80.75%, respectively, compared to 75.34%–97.72% and 54.89%–73.25% for the Gaofen predictions. The accuracies of each site indicated that patch size exerted a greater influence on model performance than the backbone. The feature-selection-based predictions with UNet++ architecture and upsampling of minor classes demonstrated the capabilities of deep-learning generalization for classifying complex ground objects, offering improved performance compared to the UNet, Deeplab V3+, Random Forest, and Object-Oriented Classification models. In addition to the overall accuracy, confusion matrices,precision, recall, and F1 scores should be evaluated for minor land-cover types. This study contributes to large-scale, dynamic, and near-real-time land-use and crop mapping by integrating deep learning and multi-source remote-sensing imagery.

关键词： Land use and crop classification Deep learning High-resolution image Feature selection UNet++

Determination of the coefficient of rolling friction of an irregularly shaped maize particle group using physical experiment and simulations

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Particuology 2018年第3期16卷 185-195页

作者： lijun wang Rui Li Baoxin Wu ZhenchaoWu Zhenjun Ding College of Engineering Northeast Agricultural University Heilongjiang 150030 China

The coefficient of rolling friction is an important physical property of a maize particle. It is difficult to obtain the value of this coefficient because of the irregular shape of maize particles. This paper describes an approach that combines the discrete-element method （DEM） and a physical test to determine the coefficient of rolling friction of irregularly shaped maize particles. A novel test platform was used to obtain the maize particle＇s coefficient of restitution and the coefficient of static friction. EDEM software （DEM- Solutions, United Kingdom） was used to simulate the accumulation of maize particles on particles and on a zincified plate. The golden-section method was used to determine the range of the maize particle＇s coefficient of roiling friction. A single-factor test was used to determine the relationship between the maize particle＇s coefficient of rolling friction and their angle of repose. The results obtained from the EDEM simulation were compared with physical test results to determine the intergranular coefficient of rolling friction and the coefficient of roiling friction between maize particles and the zincified plate. Our study demonstrates that the angle of repose increases linearly with the coefficient of rolling friction of maize particles. The effect of the coefficient of rolling friction on the particle movement is studied. The physical verification test indicates that the obtained rolling friction of the maize particles is accurate. The findings of this paper provide a theoretical basis for maize-processing machine design and a discrete-element studv of the motion of maize particles inside such machines.

关键词： Coefficient of rolling friction Irregularly shaped particle Accumulation Simulation Golden-section method Physical experiment

Protein tyrosine phosphatases in skeletal development and diseases

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Bone Research 2022年第1期10卷 1-19页

作者： Huiliang Yang lijun wang Christian Shigley Wentian Yang Department of Orthopaedic Surgery and Orthopaedic Research Institute West China Hospital of Sichuan UniversityChengdu 610041SichuanChina Department of Orthopaedic Surgery Rhode Island Hospital and Brown University Alpert Medical SchoolProvidenceRI 02903USA

Skeletal development and homeostasis in mammals are modulated by finely coordinated processes of migration, proliferation,differentiation, and death of skeletogenic cells originating from the mesoderm and neural crest. Numerous molecular mechanisms are involved in these regulatory processes, one of which is protein posttranslational modifications, particularly protein tyrosine phosphorylation(PYP). PYP occurs mainly through the action of protein tyrosine kinases(PTKs), modifying protein enzymatic activity, changing its cellular localization, and aiding in the assembly or disassembly of protein signaling complexes. Under physiological conditions, PYP is balanced by the coordinated action of PTKs and protein tyrosine phosphatases(PTPs).Dysregulation of PYP can cause genetic, metabolic, developmental, and oncogenic skeletal diseases. Although PYP is a reversible biochemical process, in contrast to PTKs, little is known about how this equilibrium is modulated by PTPs in the skeletal ***-genome sequencing has revealed a large and diverse superfamily of PTP genes(over 100 members) in humans, which can be further divided into cysteine(Cys)-, aspartic acid(Asp)-, and histidine(His)-based PTPs. Here, we review current knowledge about the functions and regulatory mechanisms of 28 PTPs involved in skeletal development and diseases;27 of them belong to class Ⅰ and Ⅱ Cys-based PTPs, and the other is an Asp-based PTP. Recent progress in analyzing animal models that harbor various mutations in these PTPs and future research directions are also discussed. Our literature review indicates that PTPs are as crucial as PTKs in supporting skeletal development and homeostasis.

关键词： harbor supporting Whole

Range of applicability of real mode superposition approximation method for seismic response calculation of non-classically damped industrial buildings

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Earthquake Engineering and Engineering Vibration 2022年第2期21卷 475-488页

作者： Li Xiaodong Sun Hongyang Ji Xiaodong Sanjukta Chakraborty wang lijun Department of Civil Engineering Key Laboratory of Civil Engineering Safety and Durability of China Education MinistryTsinghua UniversityBeijing 100084China Central Research Institute of Building and Construction Co.Ltd Beijing 100088China Department of Civil Engineering Indian Institute of Technology PalakkadKerala 678557India Huachengboyuan Engineering Technology Group Beijing 100052China

An industrial building is a non-classically damped system due to the different damping properties of the primary structure and *** objective of this paper is to quantify the range of applicability of the real model superposition approximation method to the seismic response calculation of industrial *** analysis using lumped mass-and-shear spring models indicates that for the equipment-to-structure frequency ratiosγf>1.1 orγf***,extensive parametric analyses are conducted,where both steel structures and reinforced concrete structures with equipment with various damping ratios are ***,the finite element analysis of a five-story industrial building is adopted to validate the proposed range of applicability.

关键词： non-classical damping structure-equipment interaction real mode superposition approximation method complex mode superposition method seismic response calculation

COMPASS time synchronization and dissemination—Toward centimetre positioning accuracy

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Science China(Physics,Mechanics & Astronomy) 2014年第9期57卷 1788-1804页

作者： wang ZhengBo ZHAO Lu wang ShiGuang ZHANG JianWei wang Bo wang lijun NIM-THU Joint Institute for Measurement Science(JMI) Tsinghua University Department of Physics Tsinghua University Department of Applied Physics School of Physics and Nuclear Energy Engineering Beihang University Department of Precision Instruments & Mechanology Tsinghua University

In this paper we investigate methods to achieve highly accurate time synchronization among the satellites of the COMPASS global navigation satellite system(GNSS).Owing to the special design of COMPASS which implements several geo-stationary satellites(GEO),time synchronization can be highly accurate via microwave links between ground stations to the GEO *** as space-borne relay stations,the GEO satellites can further disseminate time and frequency signals to other satellites such as the inclined geo-synchronous(IGSO)and mid-earth orbit(MEO)satellites within the *** is shown that,because of the accuracy in clock synchronization,the theoretical accuracy of COMPASS positioning and navigation will surpass that of the *** addition,the COMPASS system can function with its entire positioning,navigation,and time-dissemination services even without the ground link,thus making it much more robust and *** further show that time dissemination using the COMPASS-GEO satellites to earth-fixed stations can achieve very high accuracy,to reach 100 ps in time dissemination and 3 cm in positioning accuracy,*** this paper,we also analyze two feasible synchronization *** special and general relativistic effects related to COMPASS clocks frequency and time shifts are *** conclude that COMPASS can reach centimeter-level positioning accuracy and discuss potential applications.

关键词： GNSS time and frequency Global Navigation Satellite System GNSS time synchronization time dissemination atomic clock phase locked loop relativity Geo-stationary satellites reference system