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In situ kinetics and flocs conformation studies of kaolinite flocculated by Chi-g-CPAM

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International Journal of Minerals,Metallurgy and Materials 2023年第5期30卷 813-823页

作者： Ruijing Xu wenjie zou Bo Rao Wei Zhao Ting Wang Zhijun Zhang State Key Laboratory of High-Efficient Mining and Safety of Metal Mines of Ministry of Education University of Science and Technology BeijingBeijing 100083China School of Civil and Resources Engineering University of Science and Technology BeijingBeijing 100083China School of Chemical and Environmental Engineering China University of Mining and TechnologyBeijing 100083China

This study presents a comparative study of the flocculation behavior of kaolinite induced by chitosan-graft-poly(acrylamide-dimethyl diallyl ammonium chloride)(Chi-g-CPAM) and a commercial cationic polyacrylamide(CPAM).The flocculation behaviour was characterised in terms of both flocculation kinetics and the corresponding morphology changes during *** Chi-g-CPAM and CPAM were grafted from silica wafers by means of atom transfer radical polymerization(ATRP).The quartz crystal microbalance with dissipation(QCM-D) tests were *** equilibrium time flocculated by Chi-g-CPAM was found to be 0.46 times as that of CPAM,together with a larger total mass of kaolinite *** flocculation behaviour by Chi-g-CPAM can be well captured by a pseudo-first-order *** contrast,the presence of CPAM leads to a more complex kinetics.A relatively larger fitting slope(0.4663) was obtained at the initial stage but the fitting slope droped to 0.2026 after 800 min,indicating a densification process caused by *** flocculation kinetics of CPAM can be captured by the Elovich model for the inital stage but the combination of pseudo-first-order and pseudo-second-order models for the latter stages,which can be attributed to the long chain of *** a dosage of 75 g/t,the settling test with Chi-g-CPAM exhibits the same turbidity in the supernatant but a smaller layer thickness of the settlement compared to *** study enables a better understanding of the flocculation behavior and contributes to the development of efficient flocculants in mineral processing and tailings treatment.

关键词： Chi-g-CPAM flocculation QCM-D kinetics conformation

Coal petrology characteristics of middlings from Qianjiaying fat coal mine

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International Journal of Mining Science and Technology 2013年第5期23卷 777-782页

作者： zou wenjie Cao Yijun Zhang Zhijun Liu Jiongtian School of Chemical Engineering and Technology China University of Mining & Technology National Engineering Research Center of Coal Preparation and Purifcation China University of Mining & Technology School of Chemical and Environmental Engineering China University of Mining & Technology

The objective of this paper is to evaluate the coal petrology characteristics of slack middlings(13–0.5 mm)of dense media separation and flotation middlings from Qianjiaying fat coal preparation *** composition,macerals distribution,microlithotype and mineral occurrence of the two middlings were studied by XRD analysis and polarized light microscopy *** distribution and wettability of the float-and-sink products separated from the middlings after grinding was investigated to determine the liberation *** show that there are more vitrinite and mineral,but less inertinite in slack middlings than in flotation *** associated with mineral in slack middlings is 69.85%,by volume,which is 17.86%higher than that in flotation *** in slack middlings are dominated by pyrite and clay,which are disseminated with the diameter less than2 *** main mineral in flotation middlings is clay with size range of 2–20 *** macerals in the slack middlings are diffcult to liberate due to the fne-grained *** grinding,macerals associated with minerals in the slack middlings decrease to 46.73%,by volume,which is higher than in flotation middlings by 25.89%,by *** slack middlings with poor liberation degree,density fractions below1.8 g/cm3is hydrophobic with contact angle above 71.5°.For the well liberated flotation middlings,there is signifcant wettability difference among the float-and-sink *** research is the theoretical basis to realize re-separation of middlings.

关键词： Middlings Macerals Mineral liberation Wettability

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封头割边成形精度超差原因分析及工艺改进

新技术新工艺 2024年第5期437卷 24-27页

作者：王哲辛辉邹文杰范文革中车西安车辆有限公司陕西西安710086

某公司为了提高材料利用率,避免原材料浪费,取消封头成形过程中留有的帽沿翻边。但取消翻边会造成封头端面水平度、精度超差等问题。针对无翻边封头割边成形后出现的一系列问题进行了原因分析,并通过改进模具结构、设计专用割边划线工... 详细信息

某公司为了提高材料利用率,避免原材料浪费,取消封头成形过程中留有的帽沿翻边。但取消翻边会造成封头端面水平度、精度超差等问题。针对无翻边封头割边成形后出现的一系列问题进行了原因分析,并通过改进模具结构、设计专用割边划线工具、改进割边胎以及设计专用检测样板等4个方面来切实提高封头割边的质量精度,使得封头的合格率达到98%以上,节约材料10%。同时,在整个封头割边过程中工作效率提升50%,操作人员的工作强度也大幅降低。

关键词：封头铁路罐车封头割边模具划线质量精度

Allosterically activating SHP2 by oleanolic acid inhibits STAT3-Th17 axis for ameliorating colitis

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Acta Pharmaceutica Sinica B 2024年第6期14卷 2598-2612页

作者： Jinbo Hu Wen Liu Yi zou Chenyang Jiao Jiazhen Zhu Qiang Xu Jianjun zou Yang Sun wenjie Guo State Key Laboratory of Pharmaceutical Biotechnology Nanjing Drum Tower HospitalSchool of Life SciencesNanjing UniversityNanjing 210093China Department of Clinical Pharmacology Nanjing First HospitalNanjing Medical UniversityNanjing 210006China Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy Xuzhou Medical UniversityXuzhou 221004China

Src homology 2 domain-containing tyrosine phosphatase 2(SHP2)is an essential tyrosine phosphatase that is pivotal in regulating various cellular signaling pathways such as cell growth,differentiation,and *** activation of SHP2 has been shown to have a therapeutic effect in colitis and Parkinson's ***,the identification of SHP2 activators and a complete understanding of their mechanism is *** used a two-step screening assay to determine a novel allosteric activator of SHP2 that stabilizes it in an open *** acid was identified as a suitable *** binding to R362,K364,and K366 in the active center of the PTP domain,oleanolic acid maintained the active open state of SHP2,which facilitated the binding between SHP2 and its *** oleanolic acid-activated SHP2 hindered Th17 differentiation by disturbing the interaction between STAT3 and IL-6Rαand inhibiting the activation of ***,via the activation of SHP2 and subsequent attenuation of the STAT3-Th17 axis,oleanolic acid effectively mitigated colitis in *** protective effect was abrogated by SHP2 knockout or administration of the SHP2 inhibitor *** findings underscore the potential of oleanolic acid as a promising therapeutic agent for treating inflammatory bowel diseases.

关键词： Oleanolic acid SHP2 STAT3 Th17 Colitis Allosteric activator

Beyond Video Quality:Evaluation of Spatial Presence in 360-Degree Videos

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ZTE Communications 2023年第4期21卷 91-103页

作者： zou wenjie GU Chengming FAN Jiawei HUANG Cheng BAI Yaxian School of Telecommunications Engineering Xidian UniversityXi’an 710071China ZTE Corporation Shenzhen 518057China State Key Laboratory of Mobile Network and Mobile Multimedia Technology Shenzhen 518055China

With the rapid development of immersive multimedia technologies,360-degree video services have quickly gained popularity and how to ensure sufficient spatial presence of end users when viewing 360-degree videos becomes a new *** this regard,accurately acquiring users’sense of spatial presence is of fundamental importance for video service providers to improve their service ***,there is no efficient evaluation model so far for measuring the sense of spatial presence for 360-degree *** this paper,we first design an assessment framework to clarify the influencing factors of spatial *** parameters of 360-degree videos and headmounted display devices are both considered in this ***-designed subjective experiments are then conducted to investigate the impact of various influencing factors on the sense of *** on the subjective ratings,we propose a spatial presence assessment model that can be easily deployed in 360-degree video *** the best of our knowledge,this is the first attempt in literature to establish a quantitative spatial presence assessment model by using technical parameters that are easily *** results demonstrate that the proposed model can reliably predict the sense of spatial presence.

关键词： virtual reality quality assessment omnidirectional video spatial presence

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应用低温等离子体破碎岩石

核技术 2006年第11期29卷 877-880页

作者：陈世和麻胜荣邹文洁南华大学电气工程学院衡阳421001

一般地,破岩方法可分为机械能破岩和热能破岩两种,随着科学技术的发展,热能破岩的方法和技术已在很多领域应用,特别是利用火钻焰流开采石材在很多矿山广泛得到了应用。从实际应用出发,重点介绍了低温等离子体破岩、凿岩的原理和方法,等... 详细信息

一般地,破岩方法可分为机械能破岩和热能破岩两种,随着科学技术的发展,热能破岩的方法和技术已在很多领域应用,特别是利用火钻焰流开采石材在很多矿山广泛得到了应用。从实际应用出发,重点介绍了低温等离子体破岩、凿岩的原理和方法,等离子装置的结构及其特点。

关键词：低温等离子破碎岩石

公共卫生支出、人口聚集与医疗卫生服务均等化

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上海财经大学学报（哲学社会科学版） 2015年第3期17卷 59-67页

作者：邹文杰蔡鹏鸿福建师范大学经济学院福建福州350108

我国各省医疗卫生服务均等化水平呈现出时空分异特征。现有文献在分析造成医疗卫生服务均等化时空分异的原因时,都忽视了医疗卫生服务均等化的空间溢出效应和门槛效应。文章借助我国1995-2012年省级面板数据,应用空间计量模型对医疗卫... 详细信息

我国各省医疗卫生服务均等化水平呈现出时空分异特征。现有文献在分析造成医疗卫生服务均等化时空分异的原因时,都忽视了医疗卫生服务均等化的空间溢出效应和门槛效应。文章借助我国1995-2012年省级面板数据,应用空间计量模型对医疗卫生服务均等化的主要影响因素进行估计,结果显示:公共卫生支出强度、政府转移支付力度以及人口聚集度不同是造成医疗卫生服务均等化时空分异的主要原因。门槛面板模型检验发现,公共卫生支出强度和人口聚集度对医疗卫生服务均等化具有门槛效应,公共卫生支出强度提升至一定门槛值时,对医疗卫生服务均等化提升作用明显提高;而人口聚集度与医疗卫生服务均等化之间呈倒U形关系,即随着人口聚集度的不断提高,人口聚集对医疗卫生服务均等化作用呈现先增加后减小的变化趋势。因此,中央政府应持续提高政府转移支付力度,充分发挥政府转移支付对医疗卫生服务均等化的促进作用,努力缩小医疗卫生服务区域差异;省级政府应结合自身公共卫生支出结构及城镇化进程,采取差异化的医疗卫生服务均等化提升战略。

关键词：医疗卫生服务均等化公共卫生支出人口聚集均等化指数

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煤泥选择性絮凝浮选中颗粒间相互作用研究

中国矿业大学学报 2015年第6期44卷 1061-1067页

作者：邹文杰曹亦俊孙春宝张志军北京科技大学土木与环境工程学院北京100083 中国矿业大学国家煤加工与洁净化工程技术研究中心江苏徐州221116 中国矿业大学(北京)化学与环境工程学院北京100083

以煤泥选择性絮凝浮选中的煤颗粒以及杂质矿物高岭石为研究对象,联合Washburn动态方程,van Oss-Chaudhury-Good理论研究了阴离子型低分子量聚丙烯酰胺PAM A401吸附前后煤及高岭石颗粒表面自由能的变化,并利用扩展的DLVO理论计算了PAM A... 详细信息

以煤泥选择性絮凝浮选中的煤颗粒以及杂质矿物高岭石为研究对象,联合Washburn动态方程,van Oss-Chaudhury-Good理论研究了阴离子型低分子量聚丙烯酰胺PAM A401吸附前后煤及高岭石颗粒表面自由能的变化,并利用扩展的DLVO理论计算了PAM A401吸附前后颗粒间的相互作用势能,分析了絮凝剂吸附对不同颗粒分散状态的影响.研究表明,PAM A401的吸附改变了煤及高岭石的表面自由能及各成分的大小.煤吸附后疏水性略有降低,极性成分增加,非极性成分降低,表面自由能由39.92mJ/m2增大为40.43mJ/m2;高岭石吸附后疏水性略有增高,极性成分由58.27 mJ/m2降低为55.05 mJ/m2,表面自由能略有降低.PAM A401在颗粒表面的吸附改变了颗粒间相互作用势能的大小,尤其是界面极性作用势能的大小和作用范围,但仍未改变颗粒间总作用势能的吸引或排斥状态.本研究对微细粒煤泥选择性絮凝浮选中絮凝剂作用性能的判断和类型选择具有重要意义.

关键词：选择性絮凝浮选聚丙烯酰胺润湿性扩展的DLVO理论

环氧树脂/有机硅氧烷改性阳离子丙烯酸乳液复合涂层的研究

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中国腐蚀与防护学报 2023年第4期43卷 922-928页

作者：邹文杰丁立张雪姣陈均安徽工业大学化学与化工学院马鞍山243002

利用合成的有机硅氧烷改性的阳离子型丙烯酸(SMCWA)乳液中的胺基能够固化环氧树脂的原理,在碳钢板表面制备耐腐蚀环氧树脂/SMCWA乳液复合涂层。利用激光纳米粒度仪对SMCWA乳液粒径进行表征,使用Fourier变换红外光谱仪(FT-IR)和扫描电子... 详细信息

利用合成的有机硅氧烷改性的阳离子型丙烯酸(SMCWA)乳液中的胺基能够固化环氧树脂的原理,在碳钢板表面制备耐腐蚀环氧树脂/SMCWA乳液复合涂层。利用激光纳米粒度仪对SMCWA乳液粒径进行表征,使用Fourier变换红外光谱仪(FT-IR)和扫描电子显微镜(SEM)对复合涂层进行结构和形貌分析,利用CuSO_(4)点滴、电化学测试和中性盐雾实验研究复合涂层的耐蚀能力。结果表明,合成的SMCWA乳液粒径小,分布均匀。相较于空白SMCWA乳液涂层,环氧树脂/SMCWA乳液复合涂层的致密性和耐腐蚀性均得到增强,其中环氧树脂/SMCWA乳液质量比为9.5/0.5的复合涂层,CuSO_(4)点滴时间提高了116 s,电化学阻抗提高了4倍,腐蚀电流密度下降了一个数量级,耐盐雾能力大幅增强。

关键词：碳钢板有机硅氧烷改性阳离子型丙烯酸乳液环氧树脂防腐性能