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油田化学 2024年第2期41卷 367-376页

作者：张泽俊王占生张华王庆吉石油石化污染物控制与处理国家重点实验室北京102206 中国石油集团安全环保技术研究院有限公司北京102206 长江大学化学与环境工程学院湖北荆州434023

原油含有沥青质、胶质、环烷酸、脂肪酸、微晶石蜡、界面活性固体颗粒等天然表面活性剂。开采时地层孔隙、井筒、喷油嘴、管道阀的剪切、挤压和搅拌,驱油剂中加入的表面活性剂和水,集输和转运过程中的泵压及管道湍流,极易形成稳定的原... 详细信息

原油含有沥青质、胶质、环烷酸、脂肪酸、微晶石蜡、界面活性固体颗粒等天然表面活性剂。开采时地层孔隙、井筒、喷油嘴、管道阀的剪切、挤压和搅拌,驱油剂中加入的表面活性剂和水,集输和转运过程中的泵压及管道湍流,极易形成稳定的原油乳液。原油乳液不仅会引起管道和泵的腐蚀、降低管道的集输效率,还会在下游炼化过程中造成催化剂中毒。化学破乳因其效率高、速度快、设备简易、能耗低等优势,是原油乳液高效分离的常用方式。离子液体(ILs)具有不易燃性、热稳定性好、可回收利用、蒸汽压低等优势,是一种高效的破乳剂。通过总结ILs的特征及其作为化学破乳剂的应用现状,讨论了破乳机理及影响破乳性能的因素,指出ILs破乳剂在实际应用中存在的问题,提出了未来的研究方向。ILs适用于高盐度、高温度、高黏度等恶劣环境条件下(如超稠油)的破乳,破乳机理包括吸附、取代、离子交换等,影响破乳效果的因素包括ILs的种类和浓度、相对分子质量、盐度、温度和乳液类型等。通过选择合适的ILs及其用量,确定最佳的处理条件,可以提高破乳效率。虽然目前ILs破乳剂距离大规模应用还存在很多关键问题和挑战,但低毒或无毒、低成本、低黏度的ILs及与纳米颗粒联用和聚ILs的研发仍然具有重要意义。

关键词：离子液体原油乳状液化学破乳破乳机理综述

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中小跨径简支钢板组合梁桥荷载横向分布研究: 收藏
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引用; 建筑科学与工程学报 2024年第5期41卷 142-153页; 作者：崔晓晓刘永健封博文张泽军长安大学公路学院长安大学公路大型结构安全教育部工程研究中心山东高速集团有限公司创新研究院; 为评价经典荷载横向分布计算方法对中小跨径简支钢板组合梁桥的适用性，首先利用实桥荷载试验结果，验证了基于ABAQUS软件的三维有限元模拟方法；然后以计算跨径、主梁数量、主梁间距为研究参数，设计了108个分析模型，分别采用修正的... 详细信息; 为评价经典荷载横向分布计算方法对中小跨径简支钢板组合梁桥的适用性，首先利用实桥荷载试验结果，验证了基于ABAQUS软件的三维有限元模拟方法；然后以计算跨径、主梁数量、主梁间距为研究参数，设计了108个分析模型，分别采用修正的刚性横梁法、刚接梁法、G-M法以及有限元法计算荷载横向分布影响线，进而得到单车道和多车道作用下各主梁的荷载横向分布系数；最后基于线性相关系数、横向分布影响线吻合程度指标及横向分布系数相对误差，进行横向分布线性判断及各理论计算方法的误差分析。结果表明：当钢板组合梁桥宽跨比B/L小于0.34时，各主梁在荷载作用下挠曲呈直线变形，即认为钢板组合梁桥B/L<0.34时为窄桥；利用理论计算方法计算横向分布系数时，单车道布载下，当B/L<0.2,宜采用修正刚性横梁法、刚接梁法、G-M法，当0.2; 关键词：桥梁工程钢板组合梁桥荷载横向分布有限元分析多梁式结构中小跨径桥梁; 来源：维普期刊数据库同方期刊数据库评论; 学校读者我要写书评

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Fault tolerant attitude control of under-actuated spacecraft:Theory and experiment

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Chinese Journal of Aeronautics 2023年第5期36卷 465-474页

作者： zejun zhang Hao YANG Bin JIANG College of Automation Engineering Nanjing University of Aeronautics and AstronauticsNanjing 211106China

This paper investigates fault tolerant attitude control theory and experiment for underactuated spacecraft with one reaction wheel completely broken and two others suffering actuator faults of partial loss of effectiv... 详细信息

This paper investigates fault tolerant attitude control theory and experiment for underactuated spacecraft with one reaction wheel completely broken and two others suffering actuator faults of partial loss of effectiveness or bias.A non-smooth robust adaptive fault tolerant control law is proposed under the zero-momentum and input saturation *** shows that the available reaction wheels need to produce sufficient control torque for the fault *** a new control method is implemented in a semi-physical simulation system of an air-bearing *** results show the effectiveness of the proposed method in spacecraft practical engineering.

关键词： Actuator fault Air-bearing platform Fault tolerant control Semi-physical experiment Under-actuated spacecraft

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Fault-tolerant control of energy-conserving networks

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Science China(Information Sciences) 2020年第7期63卷 251-253页

作者： Hao YANG zejun zhang Chencheng zhang Bin JIANG College of Automation Engineering Nanjing University of Aeronautics and Astronautics

Dear editor,Fault-tolerant control (FTC) aims at guaranteeing a system goal to be achieved in spite of the existence of faults [1, 2]. For a network system, both the self-dynamics of each individual subsystem(when the... 详细信息

Dear editor,Fault-tolerant control (FTC) aims at guaranteeing a system goal to be achieved in spite of the existence of faults [1, 2]. For a network system, both the self-dynamics of each individual subsystem(when there is no coupling) and coupled-dynamics can be faulty, and the FTC design should thus be considered for the overall network system rather

关键词： cooperative control interconnected systems energy conserving network systems Fault tolerant control

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The Lushan earthquake and the giant panda:impacts and conservation

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Integrative Zoology 2014年第3期9卷 376-378页

作者： zejun zhang Shibin YUAN Dunwu QI Mingchun zhang Institute of Rare Animals and Plants China West Normal UniversityNanchongChina Chengdu Breeding Base for the Giant Panda ChengduChina China Conservation and Research Center for the Giant Panda WenchuanChina

Earthquakes not only result in a great loss of human life and property,but also have profound effects on the Earth’s *** Lushan earthquake occurred on 20 Apr 2013,with a magnitude of 7.0 and an intensity of 9.0 degr... 详细信息

Earthquakes not only result in a great loss of human life and property,but also have profound effects on the Earth’s *** Lushan earthquake occurred on 20 Apr 2013,with a magnitude of 7.0 and an intensity of 9.0 degrees.A distance of 17.0 km from its epicenter to the nearest distribution site of giant pandas recorded in the Third National Survey was *** use of research on the Wenchuan earthquake(with a magnitude of 8.0),which occurred approximately 5 years ago,we briefly analyze the impacts of the Lushan earthquake on giant pandas and their *** earthquake may interrupt ongoing behaviors of giant pandas and may also cause injury or *** addition,an earthquake can damage conservation facilities for pandas,and result in further habitat fragmentation and ***,from a historical point of view,the impacts of human activities on giant pandas and their habitat may,in fact,far outweigh those of natural disasters such as *** taken to promote habitat restoration and conservation network reconstruction in earthquake-affected areas should be based on requirements of giant pandas,not those of humans.

关键词： conservation earthquake giant panda habitat impact

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A novel lectin from mushroom Phellodon melaleucus displays hemagglutination activity,and antitumor activity in a B16 melanoma mouse model

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Food Science and Human Wellness 2023年第5期12卷 1885-1892页

作者： Yuanhui Li Peng Wang zejun zhang Qinghong Liu Department of Vegetables College of HorticultureChina Agricultural UniversityBeijing 100193China College of Food Science&Nutritional Engineering China Agricultural UniversityBeijing 100193China

A novel lectin(termed PML)was purified from fruiting bodies of the edible mushroom Phellodon melaleucus(division Basidiomycota)by ion exchange,hydrophobic interaction,and gel filtration chromatographies,with overall t... 详细信息

A novel lectin(termed PML)was purified from fruiting bodies of the edible mushroom Phellodon melaleucus(division Basidiomycota)by ion exchange,hydrophobic interaction,and gel filtration chromatographies,with overall titer recovery~60%and 20-fold *** displayed hemagglutination activity 13319 units/mg toward rabbit ***-PAGE and gel filtration analyses revealed that PML is a homodimeric lectin with a molecular weight of 28.8 *** hemagglutination activity was not inhibited by various simple sugars or their derivatives,but was enhanced by cations Ca^(2+),Mg^(2+),Zn^(2+),and Cu^(2+).The activity was stable in pH range 6–9 and in the temperature range 20–60°*** dichroism(CD)spectroscopic analysis showed that PML was composed primarily ofβ-sheets with lowα-helix *** a B16 melanoma mouse model,PML treatment significantly inhibited tumor growth,and increased cytokine IL-10 *** findings suggest that PML is a potential anticancer therapeutic agent.

关键词： Phellodon melaleucus Lectin Hemagglutination activity Cytokine IL-10 Antitumor activity

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准饱和盐水基免配缔合交联压裂液的研究及应用

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油田化学 2024年第1期41卷 26-32页

作者：郑苗蒲迪董景锋张则俊徐克山熊亚春金诚中国石油新疆油田分公司工程技术研究院新疆克拉玛依834000 四川光亚聚合物化工有限公司四川南充637500 中国石油新疆油田公司陆梁油田作业区新疆克拉玛依834000 西南石油大学油新能源与材料学院四川成都610500

玛湖风城组含有大量可溶性碱盐,特殊储层压后压降快、堵塞井筒严重影响试油。为了验证入井压裂液对储层盐矿溶蚀是否会造成影响,基于风城组储层典型碱盐矿组成特点,模拟不同配液水对储层盐矿溶蚀影响,构建了一套耐温(120℃)、抗高盐(30... 详细信息

玛湖风城组含有大量可溶性碱盐,特殊储层压后压降快、堵塞井筒严重影响试油。为了验证入井压裂液对储层盐矿溶蚀是否会造成影响,基于风城组储层典型碱盐矿组成特点,模拟不同配液水对储层盐矿溶蚀影响,构建了一套耐温(120℃)、抗高盐(30×10^(4)mg/L)免配聚合物交联压裂液体系,并进行现场试验。结果表明:高盐水较自来水对典型模拟盐的抑溶率达到60%以上;以悬浮基疏水缔合聚合物溶液“链间缠结+缔合作用+盐效应”协同作用实现增稠剂速溶、高效增黏,并与多元络合离子为核心的有机硼锆铝缓交联剂以化学交联原理形成了耐温耐高盐的免配交联压裂液体系,最优配方为1.8%稠化剂GAF-TE+0.4%交联剂JL-3+0.3%增效剂GF15B+0.04%破胶剂APS,在120℃、170 s^(-1)下剪切1 h后的黏度大于100 mPa·s,具有良好的悬砂和携砂能力。现场M井压裂施工3层,成功率为100%,压后顺利完成试油,最高日产油4.4 m~3。采用高盐压裂液体系在抑制储层溶蚀减缓地层压降快具有一定效果。

关键词：盐层溶蚀试油耐高温高盐缔合聚合物免配交联压裂液

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Grazing by wild giant pandas does not affect the regeneration of Arundinaria spanostachya

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Journal of Forestry Research 2019年第4期30卷 1513-1520页

作者： Longyan zhang Xiaohong Gan Zhengyang Hou Zhisong Yang zejun zhang Key Laboratory of Southwest China Wildlife Resources Conservation(Ministry of Education) Nanchong 637009Sichuan ProvinceChina Institute of Plant Adaptation and Utilization in Southwest Mountain China West Normal UniversityNanchong 637009China

Arundinaria spanostachya is the main bamboo species on which giant pandas *** on its regeneration capacity to meet the foraging demands of pandas is important to ensure the long-term survival of *** 2014,2 plot types(... 详细信息

Arundinaria spanostachya is the main bamboo species on which giant pandas *** on its regeneration capacity to meet the foraging demands of pandas is important to ensure the long-term survival of *** 2014,2 plot types(grazed versus control)were selected in the winter habitat used by one wild giant *** morphological and regeneration characteristics of the bamboo were assessed in the respective plots during 2014 and *** panda avoided feeding on bamboo with a basal diameter of<6 mm,preferentially feeding on intermediate-sized *** density of new shoots and the recruitment rate of shoots were significantly higher in the grazed plots compared to the control *** annual recruitment rate of shoots was markedly higher than the annual mortality rate in the same plot *** grazing,the basal diameter and height of new bamboo were similar between the 2 *** the grazed plots,the basal diameter of new bamboo was similar to that of the *** and foraging by insects were the main factors influencing the survival of new *** results showed that grazing by giant pandas helped the clonal regeneration of *** populations,with the basal diameter of new bamboo shoots meeting the foraging demand of ***,information on the carrying capacity of *** is necessary to ensure sufficient forage matter is available for reintroduced giant ***,fertilization and insect control measures should be implemented during the shooting period to optimize *** resources.

关键词： Arundinaria spanostachya(Yi)Li Grazing Impact Population regeneration Wild giant panda

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酶水解降低牛奶蛋白致敏性研究进展

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中国乳品工业 2024年第7期52卷 53-59页

作者：马晓明范俐妹张泽军庞立冬刘铭杨鑫焱张微宜品乳业(青岛)集团有限公司山东青岛266000 东北农业大学食品学院乳品科学教育部重点实验室哈尔滨150030

酶水解及其与加工技术的组合已经被广泛开发并用于降低牛奶蛋白的致敏性。文章综述了酶水解及其与其他加工技术(热处理、超声、高静水压、冷等离子体、糖基化和超滤)的组合在影响牛奶蛋白致敏性方面的最新进展和作用机制,并对比、分析... 详细信息

酶水解及其与加工技术的组合已经被广泛开发并用于降低牛奶蛋白的致敏性。文章综述了酶水解及其与其他加工技术(热处理、超声、高静水压、冷等离子体、糖基化和超滤)的组合在影响牛奶蛋白致敏性方面的最新进展和作用机制,并对比、分析和总结这些加工与酶水解技术组合优缺点。研究发现,酶水解与加工技术的组合在降低牛奶蛋白致敏性方面比单一处理更有效。主要归因于加工技术可以通过诱导蛋白质结构发生变化,使其暴露更多的酶切位点,从而提高酶对牛奶蛋白致敏表位的破坏。为低致敏性牛奶蛋白生产提供参考。

关键词：酶水解牛奶蛋白致敏性加工技术

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Effect of China's rapid development on its iconic giant panda

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Chinese Science Bulletin 2013年第17期58卷 2134-2139页

作者： ZHU LiFeng HU YiBo zhang zejun WEI FuWen Key Laboratory of Animal Ecology and Conservation Biology Institute of ZoologyChinese Academy of Sciences

Anthropogenic factors affect biodiversity and have led to the contraction or extinction of animal populations ***,we use historical demographic data,spanning the past 300 years,to show that a rapid distributional cont... 详细信息

Anthropogenic factors affect biodiversity and have led to the contraction or extinction of animal populations ***,we use historical demographic data,spanning the past 300 years,to show that a rapid distributional contraction of giant pandas took place during the 18th and 19th centuries alongside the increase in human ***-use also underwent a significant change across the areas where giant pandas were found because of government agricultural policy and the introduction of new *** impact of social development on giant pandas includes habitat loss and fragmentation,and range *** findings would facilitate the design of effective conservation strategies that seek to conserve and increase current habitats of this iconic species,especially in areas that our analysis has identified as places where pandas have suffered from high human pressure.

关键词：大熊猫栖息地标志性中国经济保护策略生物多样性种群灭绝人为因素统计数据

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