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Long-term in-situ monitoring of anchoring system and preliminary analysis of monitoring data

Journal of Earth Science 2024年

作者： Luobin Zheng huiming Tang Liangqing Wang Changdong Li Chengren Xiong Zongxing zou Chenlu Wang Lingfeng Zhu Yifan Zhang Faculty of Engineering China University of Geosciences Badong National Observation and Research Station of Geohazards China University of Geosciences

The geological environment in which the reservoir slope is situated is intricate， influenced by factors such as precipitation and fluctuations in reservoir water levels. Furthermore， the anchoring structure embedded within the rock mass of the slope undergoes corrosion and deterioration due to these factors， resulting in a highly complex interaction process between the slope rock mass and the anchoring structure. The long-term safety of rock-anchored structure systems is closely tied to the construction and safe operation of reservoirs， as both internal and external factors play a role in ensuring their stability. The present study aims to investigate this intricate issue by designing and establishing an on-site comprehensive multi-field information monitoring platform. The multi-site information monitoring platform comprises three components， namely the landslide monitoring system， anchor structure monitoring system， and data management system. The landslide monitoring system encompasses the surveillance of surface deformation， subsurface deformation， and environmental factors. The monitoring system for anchor structures includes the monitoring of prestress， anchor cable strain， and corrosion status of steel bars. The establishment of a preliminary system for data transmission and management has been accomplished. The current monitoring results indicate that the health condition of the tested anchor cables is satisfactory， and the strain and corrosion status are influenced by the design of the anchor cable structure. The platform is currently undergoing enhancements with the incorporation of cutting-edge anchoring structure design and monitoring equipment.

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Start-up Characteristics of Linear Compressors in a Refrigeration System

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Journal of Thermal Science 2021年第2期30卷 598-609页

作者： zou huiming LI Xuan TANG Mingsheng TIAN Changqing Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

This work investigates the start-up characteristics of linear compressors in a refrigeration system through experiment and simulation.Experiments are carried out by a refrigeration test system with a linear compressor controlled by a LabVIEW platform.A simulation model that considers the nonlinear process of gas force is set up on the basis of Runge-Kutta method for linear compressors.Compared with the experimental results,the simulation errors are within 15%,including the unstable state.The influences of ambient temperature and power frequency on linear compressors are studied through experiments.Unstable phenomena exist at 25℃ ambient temperature compared with the designed ambient temperature of 35℃.The unsteadiness mechanism is analyzed by simulation.Simulation analysis indicated that two sensitive stages of linear compressors,namely,starting to pump and touching top dead center,are unstable.Furthermore,properly increasing equivalent mass (approximately 3%) or spring stiffness doring the design stage can be a practical method to improve the stability of linear compressors.

关键词： linear compressor start-up dynamic characteristics unsteadiness

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Experiment Investigation and Control Strategies on Two-Phase Refrigerant Injection Heat Pump System for Electric Vehicle in Start-up Stage

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Journal of Thermal Science 2021年第3期30卷 828-839页

作者： QIN Fei LIU Hanzhou zou huiming CHEN Deqi TIAN Changqing Key Laboratory of Low-grade Energy Utilization Technologies and Systems Ministry of EducationChongqing UniversityChongqing 400044China Beijing Key Laboratory of Thermal Science and Technology and Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China

Due to the poor heating performance and operating safety in low ambient temperature,traditional Air Source Heat Pump(ASHP)for Electric Vehicles(EVs)has many limits in cold region,which can be solved by the ASHP with refrigerant injection.During the start-up stage of EV in winter,the inlet air temperature of the in-car condenser is the same as the ambient temperature.At this situation,the performance and control strategy of the heat pump require special attention.In the present study,a series of experiments were carried out on the heating performance of the Refrigerant Injection Heat Pump(RIHP)system in start-up stage of EV,at the ambient temperature from–20℃ to–5℃.The effects of compressor speed and injected refrigerant state on the heating performance of the system were discussed in depth.According to the results,the control strategies during start-up stage have been discussed in the end of the article.The study provides a practical control strategy for the RIHP system during the start-up stage of electric vehicles,helping to efficiently operate electric vehicles in cold regions.

关键词： refrigerant injection heat pump system heating performance electric vehicle start-up stage control optimization

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-30至50℃车辆工况下CO_(2)喷射器的适应性研究

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汽车工程 2024年第4期46卷 682-690页

作者：杨天阳邹慧明周晖王春磊田长青中国科学院理化技术研究所空间功热转换技术重点实验室北京100190 中国科学院大学北京100049 上海加冷松芝汽车空调股份有限公司上海201108

为推动喷射器回收膨胀功技术的实车应用,本文开展了-30~50℃宽温区运行工况下车用压缩-引射式CO_(2)热泵系统制冷制热性能及喷射器膨胀功回收特性研究,重点分析了工作喷嘴对固定尺寸喷射器变工况适应性的影响。结果表明:制冷工况下随着... 详细信息

为推动喷射器回收膨胀功技术的实车应用,本文开展了-30~50℃宽温区运行工况下车用压缩-引射式CO_(2)热泵系统制冷制热性能及喷射器膨胀功回收特性研究,重点分析了工作喷嘴对固定尺寸喷射器变工况适应性的影响。结果表明:制冷工况下随着环境温度升高,喷射系数递减,而升压比递增;制热工况下随着环境温度降低,喷射系数和升压比均先增大后减小;制冷工况下喷射器回收膨胀功占最大可回收膨胀功的16.7%~37.2%,制热工况下为9.9%~41.3%;以高温制冷工况设计的固定尺寸喷射器难以适应低温制热工况,偏离设计工况时,喷嘴出口过膨胀会造成激波能量损失,而低温制热工况下喷嘴出口因欠膨胀会导致喷射器无引射效果。

关键词：电动汽车喷射器 CO_(2) 适应性热泵系统

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金线莲ArLBD1基因克隆、亚细胞定位及表达分析

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北方园艺 2024年第1期 100-106页

作者：林江波黄惠明邹晖李和平戴艺民福建省农业科学院亚热带农业研究所福建漳州363005

以金线莲(Anoectochilus roxburghii)叶片的转录组数据为基础,采用RT-PCR技术克隆到了金线莲ArLBD1转录因子基因,采用生物信息学、原核表达、Western blot、亚细胞定位及qPCR等方法对该基因功能进行初步分析,以期为进一步研究其功能提... 详细信息

以金线莲(Anoectochilus roxburghii)叶片的转录组数据为基础,采用RT-PCR技术克隆到了金线莲ArLBD1转录因子基因,采用生物信息学、原核表达、Western blot、亚细胞定位及qPCR等方法对该基因功能进行初步分析,以期为进一步研究其功能提供参考依据。结果表明:ArLBD1基因CDS长度864 bp,编码287个氨基酸。ArLBD1蛋白分子量为30.62 kD,理论等电点为6.25,不稳定系数55.55,属于不稳定蛋白。ArLBD1蛋白含有LOB superfamily保守结构域,第7~28氨基酸为C基序,第36~84氨基酸为GAS基序,第89~107氨基酸为类亮氨酸拉链基序,具有完整的类亮氨酸拉链基序,属于ClassⅠ。系统进化分析表明ArLBD1与拟南芥AtLBD36的亲缘关系最近,其次是AtLBD6。SDS-PAGE电泳及Western blot结果显示,ArLBD1基因在大肠杆菌中成功诱导表达。亚细胞定位分析发现ArLBD1蛋白定位在细胞核。qPCR分析结果表明,ArLBD1基因在金线莲叶、茎和根中都能检测到表达,在叶片表达量最高,其次是根,茎的表达量最低,推测ArLBD1基因主要在金线莲叶片发育中发挥功能。

关键词：金线莲 ArLBD1 亚细胞定位基因克隆原核表达

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构建医院“三重一大”集体决策流程评分体系研究

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中国医院 2024年第4期28卷 60-64页

作者：刘慧明陆嘉惠唐晓丹罗云曹芳邹雨婷上海中医药大学附属市中医医院(上海市中医医院) 上海市200071

本研究以文献研究、专家咨询为基础,通过对上海市8所市级医院开展深度访谈,全面梳理“三重一大”决策流程各关键环节和特色经验,最终聚焦“前期论证”“沟通酝酿”“协调督办”等9个主要环节构建评分体系,确定25项评分指标,实现“三重... 详细信息

本研究以文献研究、专家咨询为基础,通过对上海市8所市级医院开展深度访谈,全面梳理“三重一大”决策流程各关键环节和特色经验,最终聚焦“前期论证”“沟通酝酿”“协调督办”等9个主要环节构建评分体系,确定25项评分指标,实现“三重一大”集体决策流程的量化与评估。通过评分积累,有针对性地解决个性化科室问题与共性化薄弱环节;通过持续梳理改进、良性循环,强化“三重一大”过程管理和反馈机制建设,推进民主科学决策规范化开展。

关键词：医院 “三重一大” 议事规则过程管理评分体系

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关节镜下带骨膜髂骨移植联合富血小板血浆凝胶注射治疗HeppleⅤ型距骨骨软骨损伤

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中医正骨 2024年第5期36卷 76-80页

作者：徐涛周明侯慧铭邹文龚礼胡梁深南昌市洪都中医院江西南昌330038

目的:观察关节镜下带骨膜髂骨移植联合富血小板血浆(platelet-rich plasma,PRP)凝胶注射治疗HeppleV型距骨骨软骨损伤(osteochondral lesion of the talus,OLT)的临床疗效和安全性。方法:2019年1月至2022年8月,采用关节镜下带骨膜髂骨... 详细信息

目的:观察关节镜下带骨膜髂骨移植联合富血小板血浆(platelet-rich plasma,PRP)凝胶注射治疗HeppleV型距骨骨软骨损伤(osteochondral lesion of the talus,OLT)的临床疗效和安全性。方法:2019年1月至2022年8月,采用关节镜下带骨膜髂骨移植联合PRP凝胶注射治疗HeppleV型OLT患者24例。男14例,女10例。年龄16~55岁,中位数32岁。病程6~18个月,中位数14个月。测量手术前后的踝关节活动度。采用疼痛视觉模拟量表(visual analogue scale,VAS)评分评价足部疼痛情况,采用美国足与踝关节协会(American Orthopedic Foot and Ankle Society,AOFAS)踝与后足评分标准评价踝关节功能。术后随访观察并发症发生情况。结果:所有患者均获随访,随访时间12~30个月,中位数20个月。术后1例患者出现小腿肌间静脉血栓,经对症治疗后好转。所有患者均未出现神经损伤和切口感染。踝关节活动度,术前42.16°±5.88°、术后1个月52.28°±7.24°、术后3个月58.44°±8.46°、末次随访时62.36°±10.24°。足部疼痛VAS评分,术前(5.88±1.48)分、术后1个月(3.64±1.20)分、术后3个月(2.12±0.88)分、末次随访时(1.24±0.68)分。AOFAS踝与后足评分,术前(52.22±9.46)分、术后1个月(78.28±7.24)分、术后3个月(84.48±6.68)分、末次随访时(90.44±6.44)分。结论:关节镜下带骨膜髂骨移植联合PRP凝胶注射治疗HeppleV型OLT,可以增加踝关节活动范围、减轻足部疼痛、促进踝关节功能恢复,且安全性较高。

关键词：踝损伤距骨软骨骨囊肿髂骨骨移植富含血小板血浆

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Strain effects on the interfacial thermal conductance of graphene/h-BN heterostructure

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Nano Materials Science 2022年第3期4卷 227-234页

作者： Feng Liu YouKun Gong Rui zou huiming Ning Ning Hu Yaolu Liu Liangke Wu Fuhao Mo Shaoyun Fu Cheng Yan College of Aerospace Engineering Chongqing UniversityChongqing400044China School of Mechanical Engineering Hebei University of TechnologyTianjin300401China State Key Laboratory of Reliability and Intelligence Electrical Equipment Hebei University of TechnologyTianjin300130China National Engineering Research Center for Technological Innovation Method and Tool Hebei University of TechnologyTianjin300401China College of Mechanical and Vehicle Engineering Hunan UniversityChangsha410082China School of Chemistry Physics and Mechanical EngineeringQueensland University of Technology(QUT)BrisbaneQLD4001Australia

Previous experimental and computational results have confirmed that the thermal conductivity of a twodimensional(2D) material can be considerably affected by strain. Numerous attention has been paid to explore the relevant mechanisms. However, the strain effects on the interfacial thermal conductance(ITC) of 2D heterostructure have attracted little attention. Herein, the non-equilibrium molecular dynamics(NEMD) simulations were conducted to the graphene/hexagonal boron nitride(GR/h-BN) heterostructure to investigate the strain effects on the ITC. Three types of strains were considered, i.e., tensile strain, compressive strain, and shear strain.The results indicate that the strain can adjust the ITC for the GR/h-BN heterostructure effectively, and the strain loading direction also influences the ITC. Generally, the tensile strain reduces the ITC of the heterostructure, in addition to the BN-C system at small tensile strain;both the compressive strain and shear strain increase the ITC,especially at a small strain. For the NB-C system, it is more sensitive to the strain loading direction and the yx shear strain of 0.06 is the most effective way to strengthen the ITC. Our results also show that the out-of-plane deformation weakens the in-plane vibration of atoms, leading to a reduction of the interfacial thermal energy transport.

关键词： Graphene h-BN Heterostructure Strain engineering Interfacial thermal conductance NEMD

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Mechanical-electro-magnetic coupling in strained bilayer CrI3

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Science China(Technological Sciences) 2020年第7期63卷 1265-1271页

作者： ZHANG ShuQing zou XiaoLong CHENG huiming Shenzhen Geim Graphene Center(SGC) Tsinghua-Berkeley Shenzhen Institute(TBSI)&Tsinghua Shenzhen International Graduate School(TSIGS)Tsinghua UniversityShenzhen 518055China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

The discovery of intrinsic 2D ferromagnets provides exciting possibilities for spintronics applications. A particularly attractive example is CrI3, whose monolayer is ferromagnetic while bilayer shows antiferromagnetic coupling. Because of weak interlayer coupling, the magnetism of bilayer CrI3 can be easily modulated by external perturbations, such as gating or pressure. Here, we constructed a magnetic phase diagram of bilayer CrI3 under arbitrary biaxial strain(within ±4%) from compression to stretch,and found that compressive strain can effectively convert the antiferromagnetic coupling of bilayer CrI3 to ferromagnetic.Detailed analyses on electronic structure were then performed to unravel the underlying mechanism of the magnetic phase transition. It was shown that both band gap and orbital composition at conduction band minimum play important roles in determining magnetic ground states of strained bilayer CrI3. These results strengthen our understanding of the interlayer magnetism of 2D magnets and provide a feasible way to modulate the magnetism in 2D layered materials.

关键词： bilayer Crl3 magnetic coupling strain band gap orbital composition

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Dynamic Stability Analysis of Wedge in Rock Slope Based on Kinetic Vector Method

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Journal of Earth Science 2014年第4期25卷 749-756页

作者： Weida Ni huiming Tang Xiao Liu Rui Yong Zongxing zou Faculty of Engineering China University of Geosciences Three Gorges Research Center for Geo-hazard Ministry of Education China University of Geosciences

A new method （kinetic vector method, KVM） is presented for analyzing the dynamic stability of wedge in rock slope. The dynamic analysis is carried out based on three dimensional distinct element code （3DEC）, and the kinetic inertial force of the wedge under seismic loading can be obtained via calculating the net vectorial nodal force of the finite difference grid. Then, the factor of safety （FOS） of the wedge can be calculated based on limit equilibrium method （LEM） at each dynamic analysis step, therefore time series of the FOS for whole earthquake process can be obtained. For the purpose of evaluating the entire dynamic stability of the wedge, dynamic factor of safety （DFOS） is proposed and defined as a numerical value corresponding with a given rate of probability guarantee based on reliability theory. Consequently, the KVM inherits the merits of the LEM and also has fully nonlinear dynamic analysis capabilities, and the feasibility and correctness of the KVM are tested by an example given by Hoek and Bray （1981）. Finally, a rock slope case in Wenchuan Earthquake regions of China is presented to verify the engineering practicability of the KVM, and the results matched the actual situation well.

关键词： dynamic stability limit equilibrium discrete element kinetic vector method rock slope Wenchuan Earthquake.

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