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Synergetic variations of active layer soil water and salt in a permafrost-affected meadow in the headwater area of the Yellow River,northeastern Qinghai-Tibet plateau

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International Soil and Water Conservation Research 2022年第2期10卷 284-292页

作者： Qingfeng Wang Huijun Jin ziqiang Yuan Chengsong yang State Key Laboratory of Frozen Soil Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of Sciences(CAS)320 Donggang West RoadLanzhouGansu Province730000China School of Civil Engineering Northeast-China Observatory and Research-Station of Permafrost Geo-Environment(Ministry of Education)Institute of Cold-Regions Engineering and EnvironmentNortheast Forestry University26 Hexing RoadHarbinHeilongjiang Province150040China State Key Laboratory of Grassland Agro-Ecosystem Institute of Arid Agro-EcologySchool of Life SciencesLanzhou UniversityLanzhouGansu730000China

The coupling effects and mechanisms of water,heat,and salt in frozen soils are considered to be one of the core scientific issues in frozen soil *** study was based on in situ observation data of active layer soil volumetric water content(VWC),temperature,and bulk electrical conductivity(EC)obtained at an alpine meadow site from October 2016 to November *** site is located in the headwater area of the Yellow River(HAYR).We analyzed the synergetic variations of active layer soil VWC,temperature,and bulk EC during the freeze and thaw processes and discussed the underlying *** the thaw process occurred from 10 to 80 cm depths,the VWC and bulk EC at a 10 cm depth showed syn-chronous high-frequency fluctuations and both increased *** linear decreasing rate of the VWC(bulk EC)at an 80 cm depth in the freeze depths between 0 and 40 cm was 2(1.6e2.3)times that of the VWC(bulk EC)at an 80 cm depth in the freeze depths occurring 0e10 *** soil temperature decreased in the frozen layer,unfrozen water content(bulk EC)decreased nonlinearly along with the absolute value of soil temperature(|T|),following a power(logarithmic)*** study provided data that partly elucidate the interactions among permafrost,meadow,and ecohydrological processes in the ***,our results can be used as a scientific basis for decision making on the protection and restoration of alpine grasslands,as well as for soil salinization studies.

关键词： Freeze and thaw process Active layer Soil water Bulk electrical conductivity Yellow river

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大尺寸锂离子电池液冷系统散热性能研究

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低温与超导 2022年第8期50卷 69-76页

作者：付林祥张振东盛雷杨自强彭臣浦俞轩黄俊铭上海理工大学机械工程学院上海200093

为了改善大尺寸锂离子电池高倍率运行中产热多、温升高等问题,建立液冷式电池组数值仿真模型,重点研究了乙二醇冷却液质量流量、冷却介入时刻和浓度对电池热场的影响。结果表明:当流量不低于0.4×10^(-3) kg/s时,电池最大温度和温差可... 详细信息

为了改善大尺寸锂离子电池高倍率运行中产热多、温升高等问题,建立液冷式电池组数值仿真模型,重点研究了乙二醇冷却液质量流量、冷却介入时刻和浓度对电池热场的影响。结果表明:当流量不低于0.4×10^(-3) kg/s时,电池最大温度和温差可分别控制在30.33℃和3.84℃以内;当电池最大温度为29℃(t=1 446 s)时,开启冷却系统,电池的温度场标准差为0.89℃;当采用40%浓度的乙二醇冷却液时,电池的温度场标准差及冷板压差分别为0.92℃和5.81 Pa,且浓度越低,电池组的均温性越好。

关键词：大尺寸电池液冷系统换热性能数值仿真

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Kinematic synthesis method for the one-degree-of-freedom jumping leg mechanism of a locust-inspired robot

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Science China(Technological Sciences) 2020年第3期63卷 472-487页

作者： ZHANG ziqiang yang Qi ZHAO Jing CHANG Bin LIU XingKun College of Mechanical Engineering and Applied Electronics Technology Beijing University of TechnologyBeijing 100124China Computer Science Department Heriot-Watt UniversityEdinburgh EH144ASUK

The one-degree-of-freedom(DOF) mechanism has a simple structure, convenient control, and high stiffness, and it has been applied in many micro jumping robots. Meanwhile, the six-and eight-bar mechanisms can satisfy more complex motion requirements than the four-bar jumping leg mechanism and they have good application prospects. However, the lack of effective design methods limits the application range of these mechanisms. In this work, a type and dimensional integration synthesis method was proposed with the one-DOF six-bar leg mechanism as the research object. The initial tibia and femur were determined based on the kinematic chain atlas, and configuration design was implemented through the superposition of *** a closed chain was formed in the superposition process, the feasible range of the link length was analyzed by considering the constraint conditions. The proposed method innovatively establishes the relationship between the kinematic chain atlas and the configuration, and the feasible length ranges of the links can be quickly obtained simultaneously. Several examples were provided to prove the feasibility of the kinematic synthesis method. This method provides a useful reference for the design of one-DOF mechanisms.

关键词： integration synthesis method one-DOF jumping leg bioinspired robot kinematic analysis

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木浆基湿法非织造可冲散湿厕纸特征及性能

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上海纺织科技 2023年第11期51卷 13-17,30页

作者：杨自强许士学李琳佩陈佳凡秦彩虹靳向煜吴海波河南逸祥卫生科技有限公司河南新密452374 东华大学纺织学院上海201620 东华大学产业用纺织品教育部工程研究中心上海201620

从木浆基湿法非织造可冲散湿厕纸的晃动时间、轧花面积率、干/湿态下试样宽度对湿厕纸断裂强力的影响等方面入手,探究以上因素对其可冲散率的影响。研究结果表明:木浆基湿法非织造可冲散湿厕纸的可冲散性受晃动时间、轧花面积率、短切... 详细信息

从木浆基湿法非织造可冲散湿厕纸的晃动时间、轧花面积率、干/湿态下试样宽度对湿厕纸断裂强力的影响等方面入手,探究以上因素对其可冲散率的影响。研究结果表明:木浆基湿法非织造可冲散湿厕纸的可冲散性受晃动时间、轧花面积率、短切黏胶的缠结方式等因素的影响;可冲散率在前4 min变化较快,在4~6 min内达到可冲散基准线;轧花面积率在可冲散起始阶段对其可冲散性能、可分散性能存在一定影响;可冲散水刺非织造布的干湿态断裂强力相差较大,随着试样宽度的增加,其横纵向断裂强力几乎等比例增加;干态强力主要取决于氢键作用,湿态条件下的力学性能则取决于短切纤维的缠结性能。

关键词：非织造布湿厕纸断裂强力可冲散性

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A Markov decision problem in a risk model with interest rate and Markovian environment

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Science China Mathematics 2016年第1期59卷 191-204页

作者： TAN Jiyang yang XiangQun LI ziqiang CHENG yangJin School of Mathematics and Computational Science Xiangtan University College of Mathematics and Computer Science Hunan Normal University College of Information Engineering Xiangtan University

We consider the compound binomial model in a Markovian environment presented by Cossette et al.(2004). We modify the model via assuming that the company receives interest on the surplus and a positive real-valued premium per unit time, and introducing a control strategy of periodic dividend payments. A Markov decision problem arises and the control objective is to maximize the cumulative expected discounted dividends paid to the shareholders until ruin minus a discounted penalty for ruin. We show that under the absence of a ceiling of dividend rates the optimal strategy is a conditional band strategy given the current state of the environment process. Under the presence of a ceiling for dividend rates, the character of the optimal control strategy is given. In addition, we offer an algorithm for the optimal strategy and the optimal value *** results are provided to illustrate the algorithm and the impact of the penalty.

关键词： Markovian environment optimal control strategy periodic dividend interest rate penalty for

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The surface rubbing effect on morphologies of LC droplets and electro-optic properties of flexible PDLC films

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Science China Chemistry 2009年第12期52卷 2329-2335页

作者： LIU GuoZhu XIA DuLing yang WenJun HUANG ziqiang State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054China School of Optoelectronic Information University of Electronic Science and Technology of ChinaChengdu 610054China No.58 Research Institute China Electronics Technology Group CorporationWuxi 214035China

The flexible polymer dispersed liquid crystal (PDLC) film with threshold voltage V10 and saturation driving voltage V90 as low as 0.34 V/μm and 0.77 V/μm,respectively,has been prepared successfully by polymerization induced phase separation (PIPS). The surface rubbing effect on morphologies of liquid crystals (LC) droplets and electro-optic properties of PDLC films has been studied experimentally and theoretically. We use a CVC (Color Video Camera) and a SEM (Scan Electron Microscope) to detect and characterize morphologies of LC droplets in the net of polymer. The result reveals that almost all the smaller LC droplets exhibit in the rubbing direction uniformly,and the texture of PDLC is similar to that of H-PDLC. Meanwhile,compared with the sample of the non-rubbing disposal,the response time declines evidently by 11.2 ms (i.e.,the rising time τrise) and 27.2 ms (i.e.,the decaying time τdown),and the contrast ratio is improved from 18.5 to 35.9. Such a result can be attributed to the surface rubbing effect.

关键词： polymer dispersed liquid crystal (PDLC) surface rubbing effect morphologies threshold voltage

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春季维护遵守《电业安全工作规程》的重要意义——由一次预防性试验引发的思考

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中国水能及电气化 2010年第6期 21-23页

作者：郭燕杰杨自强张华兵郜晓辉河北省邯郸市跃峰渠管理处河北邯郸056200 河北省邯郸市水电管理处河北邯郸056002 河北省邯郸市水利水电勘测设计研究院河北邯郸056004

在对升压站高压设备例行预防性试验时发现,高压隔离开关断开后,部分停电设备上仍有较高的感应电压存在,由于严格遵守了《电业安全规程》未对人身及设备造成危害。谨以此文警示试验、检修及运行值班人员严格遵守《电业安全工作规程》的... 详细信息

在对升压站高压设备例行预防性试验时发现,高压隔离开关断开后,部分停电设备上仍有较高的感应电压存在,由于严格遵守了《电业安全规程》未对人身及设备造成危害。谨以此文警示试验、检修及运行值班人员严格遵守《电业安全工作规程》的重要性。

关键词：水电站升压站电业安全工作规程预防性试验

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Distributed Energy Sharing in Energy Internet Through Distributed Averaging

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Tsinghua Science and Technology 2018年第3期23卷 233-242页

作者： yangyang Ming Jie yang Junwei Cao ziqiang Zhou Chunxiao Xing Research Institute of Information Technology Tsinghua University Beijing 100084 China. Electric Power Research Instituteof State Grid Zhejiang Electric Power Company Hangzhou310009 China

This paper proposes a distributed averaging iteration algorithm for energy sharing in microgrids of Energy Internet based on common gossip algorithms. This algorithm is completely distributed and only requires communications between neighbors. Through this algorithm, the Energy Internet not only allocates the energy effectively based on the load condition of grids, but also reasonably schedules the energy transmitted between neighboring grids. This study applies theoretical analysis to discuss the condition in which this algorithm can finally reach supply-and-demand balance. Subsequently, the related simulation validates the performance of the algorithm under various conditions.

关键词： distributed averaging energy sharing gossip algorithm Energy Internet

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The superhydrophobic sponge decorated with Ni-Co double layered oxides with thiol modification for continuous oil/water separation

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Chinese Journal of Chemical Engineering 2023年第2期54卷 296-305页

作者： Xiaodong yang Na yang ziqiang Gong Feifei Peng Bin Jiang Yongli Sun Luhong Zhang School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China

In this paper, the superhydrophobic polyurethane sponge(SS-PU) was facilely fabricated by etching with Jones reagent to bind the nanoparticles of Ni-Co double layered oxides(LDOs) on the surface, and following modification with n-dodecyl mercaptan(DDT). This method provides a new strategy to fabricate superhydrophobic PU sponge with a water contact angle of 157° for absorbing oil with low cost and in large scale. It exhibits the strong absorption capacity and highly selective characteristic for various kinds of oils which can be recycled by simple squeezing. Besides, the as-prepared sponge can deal with the floating and underwater oils, indicating its application value in handling oil spills and domestic oily wastewater. The good self-cleaning ability shows the potential to clear the pollutants due to the ultralow adhesion to water. Especially, the most important point is that the superhydrophobic sponge can continuously and effectively separate the oil/water mixture against the condition of turbulent disturbance by using our designed device system, which exhibit its good superhydrophobicity, strong ***, the SS-PU still maintained stable absorption performance after 150 cycle tests without losing capacity obviously, showing excellent durability in long-term operation and significant potential as an efficient absorbent in large-scale dispose of oily water.

关键词： Superhydrophobic sponge Ni-Co double layered oxides Thiol modification Oil absorption Oil/water separation

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Janus纤维材料非对称导液指数模型的构建、测试系统及其评价

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纺织工程学报 2024年第4期2卷 12-24页

作者：翟倩张恒甄琪甘益杨自强丁佳伟中原工学院纺织学院郑州451191 中原工学院服装学院郑州451191 河南逸祥卫生科技有限公司河南新密452300 通标标准技术服务(上海)有限公司上海200030

为有效评价大面密度纤维材料的液体非对称传输性能,依据多孔材料液体吸附机理和Langmuir方程,本文在液体非对称传输行为理论分析的基础上,自主搭建了非对称导液测试系统,建立了非对称导液指数模型,并对两大类17种样品进行测试,获得了最... 详细信息

为有效评价大面密度纤维材料的液体非对称传输性能,依据多孔材料液体吸附机理和Langmuir方程,本文在液体非对称传输行为理论分析的基础上,自主搭建了非对称导液测试系统,建立了非对称导液指数模型,并对两大类17种样品进行测试,获得了最大吸液速率、平均吸液速率、终止吸液速率、相对含水量和非对称导液指数等液体传输行为特征参数,并与液态水分管理测试仪测试结果进行了对比分析。结果表明:对于累计单向传输指数分布在28.4~680.2区间的Janus纤维材料样品,非对称导液指数对应为21.0~437.4,且二者变化规律随样品润湿梯度和差动毛细效应结构特征的改变而趋于一致,具有高的相似性。另外,随着均一结构纤维材料样品面密度从162.6增大到375.8g/m^(2),累计单向传输指数从191.1增大到2177.6,而非对称导液指数在-68.0~45.0之间波动。所搭建的非对称导液测试系统和非对称导液指数模型可以很好的评价不同面密度纤维材料的液体非对称传输行为,丰富了功能性纤维材料的评价方法,为新型Janus纤维材料的结构设计和新品开发提供测试手段。

关键词：纤维材料非对称导液指数润湿性能液体传输测试系统

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