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Effect of grain size on ferroelectric and dielectric properties of Bi_(3.25)La_(0.75)Ti_(3)O_(12) thin films prepared by rf-magnetron sputtering

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Journal of Advanced Dielectrics 2023年第5期13卷 55-60页

作者： Shuai Ma Wei Li Jigong Hao Yuying Chen zhijun xu School of Medicine Liaocheng UniversityLiaocheng 252059P.R.China Beijing Key Laboratory of Digital Stomatology Beijing 100081P.R.China School of Materials Science and Engineering Liaocheng University Liaocheng 252059P.R.China School of Environment and Materials Engineering Yantai University Yantai 264005P.R.China

Bi_(3.25)La_(0.75)Ti_(3)O_(12)(BLT)thin films are promising materials used in non-volatile *** this work,BLT films were deposited on Pt(111)/Ti/SiO_(2)/Si substrates by rf-magnetron sputtering method followed by annealing *** microstructures of BLT thin films were investigated via X-ray diffraction(XRD),scanning electron microscopy(SEM)and atomic force microscopy(AFM).With the increase in annealing temperature,the grain size increased significantly and the preferred crystalline orientation changed.A well-saturated hysteresis loop with a superior remnant polarization of 15.4μC/cm^(2) was obtained for BLT thin films annealed at 700°*** results show that the dielectric constant decreased with the increase in grain sizes.

关键词： Thin films rf-magnetron sputtering ferroelectric properties dielectric properties

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框架结构局部深降板楼面装配体系设计

中国高新科技 2024年第15期 146-147,160页

作者：吴畏徐志军罗兆南张肖峰胡乐生国家电网有限公司特高压建设分公司北京100052 中国能源建设集团广东省电力设计研究院有限公司广东广州510663

文章提出的桁架反梁与混凝土楼板组合楼面受力体系做法,考虑改善局部深降板楼面受力性能,同时考虑模块化快速生产及安装施工。混凝土楼板与桁架反梁组合构件中的桁架由工厂自动焊接成型,工厂制作加工的组合构件效率高、质量稳定、经济... 详细信息

文章提出的桁架反梁与混凝土楼板组合楼面受力体系做法,考虑改善局部深降板楼面受力性能,同时考虑模块化快速生产及安装施工。混凝土楼板与桁架反梁组合构件中的桁架由工厂自动焊接成型,工厂制作加工的组合构件效率高、质量稳定、经济效益良好。参照某电力中控楼建筑,进行有限元分析及制作安装模拟设计。

关键词：混合楼面结构桁架梁桁架梁反梁组合梁

The trajectory of rice from wild to domesticated:A new chapter in the study of origins of agriculture

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Science China Earth Sciences 2024年第9期67卷 3011-3012页

作者： zhijun ZHAO Institute of Cultural Heritage Shandong UniversityQingdao 266237China

Rice(Oryza sativa)is one of the most important food crops in the world today,feeding more than one-third of the global *** domestication of rice has always been an international research topic(Gross and Zhao,2014).When,where,and how rice was cultivated and eventually domesticated has been a hot issue in many research fields such as archaeology,biology,and agronomy(Fuller et al.,2009).

关键词： sativa Oryza crops

Numerical investigation of geostress influence on the grouting reinforcement effectiveness of tunnel surrounding rock mass in fault fracture zones

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第1期16卷 81-101页

作者： Xiangyu xu zhijun Wu Lei Weng Zhaofei Chu Quansheng Liu Yuan Zhou The Key Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province School of Civil EngineeringWuhan UniversityWuhan430072China Wuhan University Shenzhen Research Institute Shenzhen518057China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan430072China Institute of Rock and Soil Mechanics Chinese Academy of SciencesWuhan430071China

Grouting is a widely used approach to reinforce broken surrounding rock mass during the construction of underground tunnels in fault fracture zones,and its reinforcement effectiveness is highly affected by *** this study,a numerical manifold method(NMM)based simulator has been developed to examine the impact of geostress conditions on grouting reinforcement during tunnel *** develop this simulator,a detection technique for identifying slurry migration channels and an improved fluid-solid coupling(FeS)framework,which considers the influence of fracture properties and geostress states,is developed and incorporated into a zero-thickness cohesive element(ZE)based NMM(Co-NMM)for simulating tunnel ***,to simulate coagulation of injected slurry,a bonding repair algorithm is further proposed based on the ZE *** verify the accuracy of the proposed simulator,a series of simulations about slurry migration in single fractures and fracture networks are numerically reproduced,and the results align well with analytical and laboratory test ***,these numerical results show that neglecting the influence of geostress condition can lead to a serious over-estimation of slurry migration range and reinforcement *** validations,a series of simulations about tunnel grouting reinforcement and tunnel excavation in fault fracture zones with varying fracture densities under different geostress conditions are *** on these simula-tions,the influence of geostress conditions and the optimization of grouting schemes are discussed.

关键词： Numerical manifold method(NMM) Grouting reinforcement Geostress condition Fault fracture zone Tunnel excavation

纳米流体和聚合物复合材料改善水基钻井液性能试验研究

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能源化工 2024年第4期45卷 56-60页

作者：孙静如崔向龙陈柳君李超王世永徐志俊中国石油玉门油田分公司甘肃酒泉735000

通过试验研究对比了不同类型(氧化锌、二氧化钛、多壁碳纳米管、功能化多壁碳纳米管)不同质量分数(0.002 8%、0.014 3%、0.028%和0.143%)纳米流体对水基钻井液流变性能和滤失性能的影响,以及高温高压下聚合物复合材料对其性能的影响。... 详细信息

通过试验研究对比了不同类型(氧化锌、二氧化钛、多壁碳纳米管、功能化多壁碳纳米管)不同质量分数(0.002 8%、0.014 3%、0.028%和0.143%)纳米流体对水基钻井液流变性能和滤失性能的影响,以及高温高压下聚合物复合材料对其性能的影响。试验结果表明,水基钻井液流变特性和过滤性能随着纳米流体浓度的增大而增大,其中功能化多壁碳纳米管(F-MWCNTs)纳米流体改善水基钻井液性能参数最好。同时在高温高压下,聚合物(ACN-co-VP)/沸石复合材料可以明显改善纳米流体水基钻井液的流变特性,如增大塑性黏度、屈服点、滤液体积,提高纳米水基钻井液热稳定性及钻井效率,降低对地层伤害程度。

关键词：水基钻井液纳米流体聚合物复合材料流变特性滤失性

Ratiometric recognition of humidity by a europium-organic framework equipped with quasi-open metal site

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Science China Chemistry 2021年第10期64卷 1723-1729页

作者： Wei Zhang Jian Xie Zhuyin Sui zhijun xu Xiaoze Wang Min Lei Hongfa Zhang Zhongyue Li Yanlong Wang Wei Liu Wei Du Shuao Wang School of Environmental and Material Engineering Yantai UniversityYantai 264005China State Key Laboratory of Radiation Medicine and Protection School for Radiological and Interdisciplinary Sciences(RAD-X)Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education InstitutionsSoochow UniversitySuzhou 215123China

Open metal site(OMS)seated in a luminescent lanthanide(Ln)metal center offers an opportunity for rationally tuning the spectroscopic behavior of lanthanide-organic frameworks aiming for a wide range of sensing ***,given the spherical nature of common coordination geometries of trivalent lanthanides and the generally strong Ln–O bonds,the lanthanide based OMS is rarely reported and difficult to be *** report here a unique europium-organic framework containing abundant quasi-OMS that is protected by an abnormal weak Eu–O *** quasi-OMSs offer reversible direct binding sites for water molecules probed by X-ray crystallography,leading to sensitive,visible,and ratiometric luminescent sensing toward humidity and water content in organic *** specific recognition of water based on quasi-luminescentOMSs gives rise to a superior water detection limit down to 0.0003%v/v,which is one order of magnitude lower than that of Karl Fischer method.

关键词： metal-organic framework luminescence detection

左金加味方联合针灸治疗肝胃郁热型胃食管反流病的疗效及对脑肠肽的影响研究

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实用临床医药杂志 2024年第5期28卷 63-67页

作者：徐致君杨振斌邱伟夏文娟陈莉丽江苏省扬州市中医院江苏扬州225009

目的探讨左金加味方联合针灸治疗肝胃郁热型胃食管反流病的疗效及对脑肠肽的影响。方法选取2021年7月—2022年12月在扬州市中医院脾胃科门诊诊治的160例胃郁热型胃食管反流病患者为研究对象,随机分为西药组、中药组、针刺组、中药结合... 详细信息

目的探讨左金加味方联合针灸治疗肝胃郁热型胃食管反流病的疗效及对脑肠肽的影响。方法选取2021年7月—2022年12月在扬州市中医院脾胃科门诊诊治的160例胃郁热型胃食管反流病患者为研究对象,随机分为西药组、中药组、针刺组、中药结合针刺组,每组40例。西药组以雷贝拉唑为主进行治疗,中药组单用左金加味方治疗,中药结合针刺组在左金加味方基础上予以针灸足三里、中脘、太冲、内关治疗,针刺组予以单纯针灸足三里、中脘、太冲、内关。4组均治疗8周,比较4组临床疗效、治疗前后耐信量表评分、中医主要症状积分、食管黏膜评分、血管活性肠肽水平。结果治疗后,中药结合针刺组治疗总有效率高于其他3组,中医主要症状积分、耐信量表评分、食管黏膜评分、血浆血管活性肠肽水平低于其他3组和治疗前,差异有统计学意义(P<0.05)。结论左金加味方联合针灸可有效减轻胃食管反流病临床症状,促进黏膜愈合,提高治疗效果。

关键词：左金加味方肝胃郁热胃食管反流病针灸食管炎脑肠肽

Computer-aided Visual Assessment of the Grade of Clothing Fit

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International English Education Research 2015年第4期 71-72页

作者： xu zhijun Wu yishan xu zengbo Fashion College Shanghai University of Engineering Science Shanghai China

The paper first introduces and analyzes the merits and demerits of some traditional methods of evaluating the grade of clothing fit. Then a computer-aided evaluating method is put forward. In this process two groups are needed. The control group is made up of people who wear maillot while the experimental group consists of those who wear target clothes to be evaluated. People in these two groups are taken photos respectively from front, back and lateral sides. The photos are input computer and receive a series of image processing using Open CV which provides the open source library function including image preprocessing, edge detection and image segmentation, etc. Finally, taking the clothing ease into account, the processed data is used for region matching and evaluating the grade of clothing fit.

关键词： Evaluating Grade of Clothing Fit image processing Open CV Computer Vision

Long non-coding RNA H19 regulates neurogenesis of induced neural stem cells in a mouse model of closed head injury

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Neural Regeneration Research 2024年第4期19卷 872-880页

作者： Mou Gao Qin Dong zhijun Yang Dan Zou Yajuan Han Zhanfeng Chen Ruxiang xu Department of Neurosurgery Sichuan Academy of Medical Sciences and Sichuan Provincial People's HospitalSchool of MedicineUniversity of Electronic Science and Technology of China Department of Neurosurgery Chinese PLA General Hospital Zhongsai Stem Cell Genetic Engineering Co. Ltd. Department of Neurology Fu Xing HospitalCapital Medical University

Stem cell-based therapies have been proposed as a potential treatment for neural regeneration following closed head *** previously reported that induced neural stem cells exert beneficial effects on neural regeneration via cell ***,the neural regeneration efficiency of induced neural stem cells remains *** this study,we explored differentially expressed genes and long non-coding RNAs to clarify the mechanism underlying the neurogenesis of induced neural stem *** found that H19 was the most downregulated neurogenesis-associated lnc RNA in induced neural stem cells compared with induced pluripotent stem ***,we demonstrated that H19 levels in induced neural stem cells were markedly lower than those in induced pluripotent stem cells and were substantially higher than those in induced neural stem cell-derived *** predicted the target genes of H19 and discovered that H19 directly interacts with mi R-325-3p,which directly interacts with Ctbp2 in induced pluripotent stem cells and induced neural stem *** H19 or Ctbp2 impaired induced neural stem cell proliferation,and mi R-325-3p suppression restored the effect of H19 inhibition but not the effect of Ctbp2 ***,H19 silencing substantially promoted the neural differentiation of induced neural stem cells and did not induce apoptosis of induced neural stem ***,silencing H19 in induced neural stem cell grafts markedly accelerated the neurological recovery of closed head injury *** results reveal that H19 regulates the neurogenesis of induced neural stem cells.H19 inhibition may promote the neural differentiation of induced neural stem cells,which is closely associated with neurological recovery following closed head injury.

关键词： closed head injury Ctbp2 induced neural stem cell lncRNA H19 miR-325-3p neurogenesis