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伺服液压系统在榨油装置中设计与应用研究

粮食与食品工业 2024年第4期31卷 7-9页

作者：张瑞洋侯飞吴之强张利军无锡中粮工程科技有限公司无锡214035

本文阐述了一种双柱式承载式整体结构的液压榨油装置设计,通过采用伺服液压站精准控制流量和压力实现各项压榨需求,以及该设计在榨油装置中的应用。

关键词：液压伺服榨油装置压榨制油

The Maihe River:Literary Writing about Land and Thoughts on Modernity

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Frontiers of Literary Studies in China-Selected Publications from Chinese Universities 2023年第2期17卷 172-182页

作者： SONG Xueqing zhang lijun Institute of Chinese and Foreign Cultural Studies Jjilin International Studies UniversityChangchun 130117China College of Liberal Arts Jinan UniversityGuangzhou 510632China

The Maihe River by Guan Renshan returns sto the literaryprincipleof traditional realism and insists on the rural narrative based on daily *** is a novel that truly traces rural life,with a focus on the land circulation system and the fate of *** the work,Guan Renshan integrates farmers love for the land into a culture of the land and a culture of *** worship and the trend of modern agricultural development in The Maihe River constitute a profound *** this novel,he investigates possibilities for rural modernization as well as reasonable and legitimate means to realize them.

关键词： Guan Renshan The Maihe River realism rural trilogy

基于多元主体需求的老旧生活性街区改造规划路径——以沈阳市大东区万寿小区为例

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沈阳建筑大学学报（社会科学版） 2024年第1期26卷 20-26页

作者：周阳雪景文华张立军沈阳建筑大学设计集团有限公司国土空间规划院辽宁沈阳110016 沈阳城市建设学院建筑与规划学院辽宁沈阳110167

城镇老旧小区改造是城市更新的重要着力点,改造过程中出现的多方主体利益和需求关系,是打造共建共治共享社会的关键因素。阐析了多主体的利益诉求与博弈焦点,并构建了基于多元主体需求的改造路径。以沈阳市大东区万寿小区为例,对居民主... 详细信息

城镇老旧小区改造是城市更新的重要着力点,改造过程中出现的多方主体利益和需求关系,是打造共建共治共享社会的关键因素。阐析了多主体的利益诉求与博弈焦点,并构建了基于多元主体需求的改造路径。以沈阳市大东区万寿小区为例,对居民主体、政府主体、管理主体需求进行了调查分析,并结合改造路径的区域评估、整体统筹、策划方案和长效管理四步骤,提出了老旧生活性街区改造规划措施,以期为老旧小区提升改造提供新思路和参考。

关键词：老旧小区多元主体生活性街区规划路径沈阳市

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Prevalence and risk factors of cardiovascular diseases and psychological distress among female scientists and technicians

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2022年第12期23卷 1057-1064页

作者： lijun zhang Yanping BAO Guo LI Shuhui TAO Meiyan LIU Department of Psycho-Cardiology Beijing Anzhen HospitalCapital Medical UniversityBejing 100029China National Institute on Drug Dependence and Beijing Key Laboratory of Drug Dependence Peking UniversityBeijing 100191China School of Public Health Peking UniversityBejing 100191China Henan Medical School Henan UniversityKaifeng 475001China

This study aimed to explore the prevalence and risk factors of cardiovascular disease(CVD)and psychological distress among female scientists and technicians in ***,we included scientists and technicians from representative research institutions,medical institutions,colleges,universities,and businesses in China,and the data were collected from July 1,2019 to March 31,2021 via online *** parameters evaluated in this study included age,sex,marital status,educational background,monthly income,sleep hours,sleep problems,smoking,alcohol consumption,work-related stress,work burnout,cardiovascular symptoms,CVD,family history,and depressive and anxiety symptoms.A total of 14530 scientists and technicians were included,comprising 7144 men and 7386 *** found 34.9%men and 16.6%women with CVD,35.1%men and 21.4%women with depressive symptoms,28.7%men and 13.8%women with anxiety symptoms,and 22.0%men and9.5%women with CVD combined with depressive or anxiety *** study focused on the details of *** women(age≤35 years)had the highest prevalence of depressive symptoms(24.9%),anxiety symptoms(16.2%),and comorbidity(11.2%).It was established that,despite traditional risk factors,unmanageable work burnout,depressive symptoms,and anxiety symptoms were associated with a higher risk of CVD in women;insomnia,overwhelming work stress,unmanageable work burnout,and CVD were linked to a higher risk of depressive symptoms and anxiety;insomnia,overwhelming work stress,and unmanageable work burnout were related to CVD combined with depressive or anxiety symptoms.A bidirectional relationship was noted between CVD and depression or anxiety in female scientists and technicians,and insomnia and overwhelming work stress were positively associated with *** is suggested that effective measures should be taken to protect female scientists and technicians from CVD and psychological distress.

关键词： Female scientist and technician Depressive symptom Anxiety Insomnia Cardiovascular disease(CVD)

An Axiom System of Probabilistic Mu-Calculus

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Tsinghua Science and Technology 2022年第2期27卷 372-385页

作者： Wanwei Liu Junnan Xu David N.Jansen Andrea Turrini lijun zhang College of Computer Science National University of Defense TechnologyChangsha 410073China State Key Laboratory of Computer Science Institute of SoftwareChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100039China Institute of Intelligent Software Guangzhou 511458China

Mu-calculus(a.k.a.μTL)is built up from modal/dynamic logic via adding the least fixpoint operatorμ.This type of logic has attracted increasing attention since Kozen’s seminal work.PμTL is a succinct probabilistic extension of the standardμTL obtained by making the modal operators *** of this logic,such as expressiveness and satisfiability decision,have been studied *** consider another important problem:the axiomatization of that *** extending the approaches of Kozen and Walukiewicz,we present an axiom system for Pμ*** addition,we show that the axiom system is complete for aconjunctive formulas.

关键词： PμTL axiom system aconjunctive formula tableau approach

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黄渤海地区大气折射环境参数统计分析

微波学报 2024年第4期40卷 41-45,51页

作者：张利军杜峰李建儒王红光赵振维中国电波传播研究所青岛266107 解放军31401部队济南250002

大气折射环境显著影响微波、超短波无线电装备的性能,能够减小或者扩展标准大气环境下的无线电视距。文中以黄渤海交界处的荣成为例,基于2018年探空数据统计分析了荣成站的大气折射环境参数,包括地面折射率、1 km折射率梯度、100 m折射... 详细信息

大气折射环境显著影响微波、超短波无线电装备的性能,能够减小或者扩展标准大气环境下的无线电视距。文中以黄渤海交界处的荣成为例,基于2018年探空数据统计分析了荣成站的大气折射环境参数,包括地面折射率、1 km折射率梯度、100 m折射率梯度等参数。其中,地面折射率年度变化范围可达100 N单位,地面折射率年平均值为332.3 N单位;1 km折射率梯度年平均值为-48.5 N/km;100 m折射率梯度年平均值为-44.2 N/km,100 m折射率梯度小于-100 N/km的时间概率为3%。进一步地,文中给出了计算雷达视距需要用到的等效地球半径因子以及用于表征相对标准大气无线电视距的扩展或减小的视距因子分布。结果表明:等效地球半径因子最大可达4.5;相对标准大气环境下,大气折射环境对视距影响的最大变化范围可达80%以上。研究结果可为黄渤海地区试验装备的系统设计、性能评估提供大气折射环境参考。

关键词：大气折射地面折射率 1 km折射率梯度 100 m折射率梯度无线电视距

A novel computational model for isotropic interfacial energies in multicomponent alloys and its coupling with phase-field model with finite interface dissipation

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Journal of Materials Science & Technology 2023年第2期133卷 111-122页

作者： Shenglan Yang Jing Zhong Jiong Wang Jianbao Gao Qian Li lijun zhang State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China Shenzhen Research Institute Central South UniversityShenzhen 518057China

In this work,a novel computational model for the description of the temperature-and composition-dependent isotropic interfacial energy in multicomponent alloys was first developed in the framework of the CALculation of PHAse Diagram(CALPHAD)approach and implemented in a home-made *** linking to the open-source code for interfacial energy calculation in alloys,OpenIEC,the databases for isotropicγ/liquid andγ/γ’interfacial energies in Ni-Al,Ni-Cr,Al-Cr,and Ni-Al-Cr systems were then efficiently *** that,a direct coupling strategy between the current CALPHAD interfacial en-ergy database and the phase-field model with finite interface dissipation was proposed and applied to three-dimensional(3-D)phase-field simulations of the primaryγdendritic growth in both Ni-Al and Ni-Al-Cr alloys during isothermal *** effect of the interfacial energy on the morphology,tip growth rate,and partitioning coefficients in primaryγdendrites of binary Ni-Al and ternary Ni-Al-Cr alloys was investigated by comprehensively comparing the phase-filed simulation results using the composition-/temperature-dependent interfacial energies with those using the constant *** is an-ticipated that the presently developed CALPHAD model for interfacial energy is of general validity for different multicom ponent alloys and should be integrated with the phase-field model for quantitative simulation of their microstructure evolution.

关键词： Interfacial energy CALPHAD OpenIEC Phase-field simulation Dendritic solidification

多次玻璃体内注射抗VEGF药物对眼底血管性疾病患者角膜组织形态的影响

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眼科新进展 2024年第3期44卷 230-234页

作者：祁媛媛闫春晓金翠华袁琳慧李胜张立军大连医科大学辽宁省大连市116044 大连医科大学附属大连市第三人民医院眼科辽宁省角膜与眼表疾病重点实验室辽宁省大连市116033

目的探讨多次玻璃体内注射雷珠单抗和阿柏西普对湿性老年性黄斑变性(nAMD)、糖尿病黄斑水肿(DME)、视网膜静脉阻塞(RVO)患者角膜组织形态的影响。方法前瞻性临床研究。选取2021年6月至2022年6月在我院眼内科注射中心治疗的患者共64例... 详细信息

目的探讨多次玻璃体内注射雷珠单抗和阿柏西普对湿性老年性黄斑变性(nAMD)、糖尿病黄斑水肿(DME)、视网膜静脉阻塞(RVO)患者角膜组织形态的影响。方法前瞻性临床研究。选取2021年6月至2022年6月在我院眼内科注射中心治疗的患者共64例(64眼)作为研究对象;其中nAMD患者19例,DME患者20例,RVO患者25例。阿柏西普(40 g·L^(-1))治疗29例,雷珠单抗(10 g·L^(-1))治疗35例。所有入组病例均选取单眼注射,采取3+PRN的随访治疗方法。使用共聚焦显微镜行角膜神经检查,使用角膜内皮显微镜进行角膜厚度及角膜内皮细胞检查。比较nAMD、DME、RVO患者多次玻璃体内注射抗VEGF药物后角膜厚度、内皮细胞密度、变异系数、平均面积、六角形细胞比例、神经纤维长度、神经纤维密度,比较每次注射不同药物后1个月与基线时上述指标变化。结果术前,DME组患者内皮细胞密度低于nAMD组和RVO组,DME组患者内皮细胞平均面积高于nAMD组和RVO组,差异均有统计学意义(均为P0.05)。注射抗VEGF药物3次后,DME组患者内皮细胞密度低于nAMD组和RVO组,内皮细胞平均面积高于nAMD组和RVO组,差异均有统计学意义(均为P0.05)。自从第2次注射雷珠单抗后,RVO组患者内皮细胞密度均较术前减少,差异均有统计学意义(均为P<0.05)。结论多次玻璃体内注射抗VEGF药物会一定程度降低角膜内皮六角形细胞比例及内皮细胞密度,注射药物后DME组的神经纤维长度显著低于nAMD组和RVO组。

关键词：抗血管内皮生长因子内皮细胞密度角膜神经阿柏西普雷珠单抗

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离心空压机波箔气体轴承设计及实验研究

润滑与密封 2024年第6期49卷 161-168页

作者：化文灿杨山举王琪张丽君曾一鸣西北农林科技大学机械与电子工程学院陕西咸阳712100

针对功率26 kW、主轴径22 mm的氢燃料电池离心空压机,设计波箔动压气体轴承;在搭建的实验台上进行轴承静动态特性实验和耐久性实验,得到轴承滞回曲线和静态刚度曲线,以及空压机轴系升降速振动三维频谱图、30 000~95 000 r/min下的时域... 详细信息

针对功率26 kW、主轴径22 mm的氢燃料电池离心空压机,设计波箔动压气体轴承;在搭建的实验台上进行轴承静动态特性实验和耐久性实验,得到轴承滞回曲线和静态刚度曲线,以及空压机轴系升降速振动三维频谱图、30 000~95 000 r/min下的时域图。实验结果表明:研发的波箔动压气体轴承静态刚度与轴承位移具有非线性特性;空压机启停100 000余次后,平箔表面仅有轻微磨损,波箔高度几乎无变化,表明轴承具有良好的耐久性;转子振动以基频为主,全转速范围内主振幅为1μm左右,无明显低频和高频振动;两级气浮轴承离心空压机实验最高工作转速可达95 000 r/min,并且表现出良好的热力性能。

关键词：波箔动压气体轴承离心空压机涡动阻尼动态特性静态特性