检索结果-南通市图书馆

Characterization and modeling studies towards Al_(3)Ti/Mg interfaces in Ti reinforced AZ31 alloys

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第16期147卷 197-206页

作者： Longke Bao shengli Han Shengkun xi Yuhui Zhang Cuiping Wang Kaihong Zheng Rongpei Shi xingjun liu Fusheng Pan State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyShenzhen 518055China College of Materials Science and Engineering and Institute of Materials Genome and Big DataHarbin Institute of TechnologyShenzhen 518055China Institute of New Materials Guangdong Academy of SciencesGuangzhou 510650China College of Materials Science and Engineering Xiamen UniversityXiamen 361005China College of Materials Science and Engineering Chongqing UniversityChongqing 400045China

The interfaces between in-situ Al3Ti particles and magnesium(Mg)matrix are crucial role in highperformance titanium(Ti)reinforced AZ31 ***,the interfaces between Al3Ti particles and the Mg matrix are fabricated and investigated using advanced characterization tools and first-principles *** orientation relationship(OR)and atomic interface structure between the Al_(3)Ti particles and matrix are characterized using a high-resolution transmission electron *** OR is determined to be(1010)Mg//(001)Al3Ti;[1213]Mg//[100]*** on the characterized OR,the interface properties(including atomic structure,work of adhesion,interface energy,and fracture mechanism)are investigated using first-principles *** relaxed interface structure indicates that the TiAl-terminated bridge site configurations(MT1)and hollow site configurations(HCP1)are unstable and would convert into other bridge site configurations(MT).Furthermore,the work of adhesion and interface energy suggests that Al-terminated hollow site configurations(HCP)and bridge site configurations(MT)are more stable than other *** addition,the calculations of work of fracture show that fracture of the interfaces with Al-MT1,Al-HCP,and TiAl-MT configurations may initiate from bulk Mg *** findings may help to understand and tailor the deformation mechanisms and mechanical properties of Ti-reinforced Mg alloys.

关键词： Ti/AZ31 alloy Mg/Al_(3)Ti interface HAADF-STEM First-principles computation

Thermochemical Properties of Ternary Complexes of RE Perchlorate with Glycine and Imidazole

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 1999年第2期17卷 18-21页

作者： Yang, Xuwu liu, xiangrong Gao, shengli liu, Jianrui Northwest Univ Xi'an China

The combustion energy has been determined for the nine solid complexes of rare earth perchlorate with glycine and imidazole using a rotatingbomb *** standard enthalpy of combustion,H0 -c,coor(s), and standard enthalpy of formation,H0 -f,coor(s), for these complexes have been calculated. From the plot of standard enthalpy of formation versus atomic number of the elements in lanthanide series the tripartite effect regularity was observed and the unknown standard enthalpy of formation for similar complexes,Ce(Gly)4(Im)(ClO4)32H2O and Pm(Gly)4(Im)(ClO4)32H2O,can be estimated according to the figure.

关键词： Rare earths Rare earth perchlorate,Glycine,Imidazole,Combustion energy,Standard enthalpy of formation

在线全文

学校读者我要写书评

暂无评论

鄂尔多斯盆地大气区的勘探实践与前瞻

天然气工业 2015年第8期35卷 1-9页

作者：席胜利刘新社孟培龙中国石油长庆油田公司低渗透油气田勘探开发国家工程实验室

鄂尔多斯盆地天然气资源丰富,中国石油长庆油田公司(以下简称长庆油田)在该盆地内已先后发现了靖边、榆林、子洲、乌审旗、苏里格、神木等6个千亿立方米级大气田,系统总结该大气区的勘探成果和有效做法,兼具指导和借鉴作用。为此,根据... 详细信息

鄂尔多斯盆地天然气资源丰富,中国石油长庆油田公司(以下简称长庆油田)在该盆地内已先后发现了靖边、榆林、子洲、乌审旗、苏里格、神木等6个千亿立方米级大气田,系统总结该大气区的勘探成果和有效做法,兼具指导和借鉴作用。为此,根据长庆油田50多年的天然气勘探实践,梳理了各主要历史阶段所依靠的地质理论和所取得的认识突破,分析总结了历经长期技术攻关所形成的适用性勘探配套技术,以及在拓宽勘探思路、创新管理机制等方面的历史经验和有效做法。理论突破点包括:河流三角洲成藏理论、大型致密气成藏理论和盆地南部沉积物源体系新认识;技术创新点包括:全数字地震技术、气层测井精细评价技术和致密砂岩储层改造技术;拓宽勘探思路包括:大型岩性气藏勘探部署思路和勘探开发一体化战略;管理创新包括:扁平化项目管理和对标管理。

关键词：鄂尔多斯盆地勘探历程地质理论配套技术管理创新中国石油长庆油田公司

鄂尔多斯盆地西南缘中生代火成碳酸盐岩的发现及意义

在线全文

学校读者我要写书评

暂无评论

石油与天然气地质 2016年第2期37卷 173-179,188页

作者：席胜利李振宏刘新社中国石油长庆油田分公司勘探事业部陕西西安710018 中国地质科学院地质力学研究所北京100081

鄂尔多斯盆地属于我国中西部地区稳定的克拉通盆地。盆地边缘构造活动强烈,逆冲推覆构造发育,岩浆活动频繁;盆地内部构造稳定,以前尚未有岩浆活动的报道。鄂尔多斯盆地西南缘庆深1井蓟县系白云岩中火成碳酸盐岩侵入岩脉的发现,为重新认... 详细信息

鄂尔多斯盆地属于我国中西部地区稳定的克拉通盆地。盆地边缘构造活动强烈,逆冲推覆构造发育,岩浆活动频繁;盆地内部构造稳定,以前尚未有岩浆活动的报道。鄂尔多斯盆地西南缘庆深1井蓟县系白云岩中火成碳酸盐岩侵入岩脉的发现,为重新认识盆地内部的构造活动性提供了新的线索。该套侵入岩脉稀土元素球粒陨石标准化图解中没有明显的Eu异常,符合火成碳酸盐岩的基本特征。同时,在碳、氧同位素交汇图解中,分析点全部落入了火成碳酸盐岩的范围。通过锆石U-Pb同位素测年,该套火成碳酸盐岩的形成时代为176.2 Ma±3.3 Ma,属于早-中侏罗世构造活动的产物。火成碳酸盐岩的形成主要受控于北东-南西向基底大断裂带在早中侏罗世时期的隐性活动,为扬子板块向华北克拉通俯冲挤压之后区域伸展作用的产物。鄂尔多斯盆地西南缘早侏罗世末期火成碳酸盐岩侵入脉的发现,为认识华北克拉通早侏罗世区域拉张的构造背景提供了新的证据。

关键词：碳、氧同位素锆石U-Pb年代学火成碳酸盐岩地球化学中生代鄂尔多斯盆地

Genesis of Dolomite from Ma5^5-Ma5^10 Sub-members of the Ordovician Majiagou Formation in the Jingxi Area in the Ordos Basin

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2017年第4期91卷 1363-1379页

作者： liu Jingdong JIANG Youlu liu xinshe YANG Zhiwei HOU xiangdong ZHU Rongwei WEN Caixia WANG Feiyan School of Geosciences China University of Petroleum Qingdao 266580 China State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing 102249 China Research Institute of Exploration & Development Changqing Oilfield Company PetroChina Xi'an 710018 China Marine Oil Production Plant Sinopec Shengli Oil field Dongying 257000 China Key Laboratory of Marginal Sea Geology South China Sea Institute of Oceanology Chinese Academy of Science Guangzhou 510301 China

We clarified three stages of dolomitization and secondary changes by studying the petrology and geochemistry characteristics of dolomite from the Ma5^5-Ma5^10 sub-members of the Ordovician Majiagou Formation in the Jingxi area in the Ordos Basin：（1） Syngenetic microbial dolomitization is characterized by formation of dolomite with a mainly micrite structure and horse tooth-shape dolomite cements. （2） Seepage reflux dolomitization during the penecontemporaneous period superposed adjustment functions such as recrystallization and stabilization in the middle-deep burial stage, forming dolomites mainly consisting of micro crystal and powder crystal structure. （3） Powder dolomite, fine dolomite, and medium-coarse crystalline dolomite formed in pores and fractures in the middle-deep burial stage. The secondary concussive transgression-regression under a regressive background is an important condition for the occurrence of many stages of dolomitization in the study area. The basin was an occlusive epicontinental sea environment in the Ma5 member of the Ordovician Majiagou Formation sedimentary period. In the sediments, sulfate content was high, which is conducive to the preservation of microbial activity and microbial dolomitization. Micritic dolomite formed by microbial dolomitization provides good migration pathways for seepage reflux dolomitization. Affected by evaporation seawater with increased Mg/Ca ratio, seepage reflux dolomitization was widely developed and formed large-scale dolomite, and underwater uplifts and slopes are favorable areas for dolomite. In the middle-deep burial stage, dolomitizing fluid in the stratum recrystallized or stabilized the previous dolomite and formed a small amount of euhedral dolomite in the pores and fractures.

关键词： Ordos Basin Ordovician genesis of dolomite microbial dolomitization seepage reflux dolomitization burial dolomitization

Transplanted choroidal plexus epithelial cells can integrate with organotypic spinal cord slices into a new system

在线全文

学校读者我要写书评

暂无评论

BIOCELL 2022年第6期46卷 1537-1544页

作者： JINGJIE liu xiAOYAN DING LI xiANG shengli HUANG Department of Neurology The Second Affiliated HospitalCollege of MedicineXi’an Jiaotong UniversityXi’an710004China Department of Ophthalmology Xi’an No.3 HospitalXi’an710018China Department of Orthopedics The Second Affiliated HospitalCollege of MedicineXi’an Jiaotong UniversityXi’an710004China

This study aimed to evaluate the integration of transplanted choroidal plexus epithelial cells with organotypic spinal cord *** spinal cord slices,normally cultured for 6 days,were divided into control group(Ctrl)and transplanted group(T).The choroidal plexus epithelial cells were dissociated and primary cultured(C group).The choroidal plexus epithelial cells cultured for 6–7 days were labeled by 1,1’-dioctadecyl-3,3,3’,3’-tetramethylindocarbocyanineperchlorate(CM-Dil),and were identified by transthyretin(TTR)in *** were adjusted to the density of 0.5–1×107/ml,then 2μl cells suspension were transplanted to the spinal cord slices in the T *** same amount of basal medium was dripped on the spinal cord slices in the Ctrl *** 14 days of transplantation,the differentiations into neurons and astrocytes,and the synapses were identified by immunofluorescence *** the same time,the ratios of cell differentiations and synapses in new system,and the changes of MAPK signaling pathway were tested by western *** choroid plexus epithelial cells were well labeled by CM-Dil and were immune-stained by TTR in *** choroid plexus epithelial cells bodies were small when transplanted on the spinal cord slices,but big when transplanted on the polyester membrane *** transplanted cells could differentiate into astrocytes,and possibly differentiate into neurons,and there were a large number of synaptophysin positive vesicles between transplanted cells and organotypic spinal cord slices in immunofluorescence *** levels of GFAP,TUB-III and synaptophysin in the T group were higher than which in the Ctrl and C groups in western blotting(P<0.05).And the ratios of p-JNK/JNK and p-P38/P38 in the T group were significantly lower than which in the Ctrl and C groups(P<0.05).But the ratio of p-ERK/ERK in the three groups was of no significant *** transplanted choroidal plexus epi

关键词： Cell transplantation Choroidal plexus epithelial cells Integration Organotypic spinal cord slices

Study on Mass Transports in Evolution of Separation Bubbles Using LCSs and Lobe Dynamics

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Computational Physics 2017年第6期22卷 285-302页

作者： shengli Cao Wei Wang Jiazhong Zhang Yan liu School of Power and Energy Engineering Xi’an JiaotongUniversityXi’an710049P.R.China School of Mechanical Engineering Northwestern Polytechnical UniversityXi’an710072P.R.China

The lobe dynamics andmass transport between separation bubble andmain flow in flow over airfoil are studied in detail,using Lagrangian coherent structures(LCSs),in order to understand the nature of evolution of the separation *** this problem,the transient flow over NACA0012 airfoil with low Reynolds number is simulated numerically by characteristic based split(CBS)scheme,in combination with dual time ***,LCSs and lobe dynamics are introduced and developed to investigate themass transport between separation bubble andmain flow,from viewpoint of nonlinear *** results show that stablemanifolds and unstable manifolds could be tangledwith each other as time evolution,and the lobes are formed periodically to induce mass transport between main flow and separation bubble,with dynamic ***,the evolution of the separation bubble depends essentially on themass transportwhich is induced by lobes,ensuing energy andmomentum *** the results,it can be drawn that the dynamics of flow separation could be studied using LCSs and lobe dynamics,and could be controlled feasibly if an appropriate control is applied to the upstream boundary layer with high momentum.

关键词： Mass transport separation bubble Lagrangian coherent structures lobe dynamics

Ultralow oxygen ion diffusivity in pyrochlore-type La_(2)(Zr_(0.7)Ce_(0.3))_(2)O_(7)

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第7期102卷 174-185页

作者： Junwei Che xiangyang liu Xuezhi Wang Quan Zhang Erhu Zhang Gongying Liang shengli Zhang MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter School of PhysicsXi’an Jiaotong UniversityXi’an 710049China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Department of Applied Physics School of ScienceChang’an UniversityXi’an 710064China

Thermally grown oxides(TGOs)at the ceramic top-coat/metallic bond-coat interface are a pressing chal-lenge in advanced thermal barrier coating(TBC)systems as they can affect the performance and ser-vice lifetime of ***,developing novel TBC materials with ultralow oxygen ion diffusivity is very *** this study,we reported the diffusive properties of oxygen ions in a novel pyrochlore-type La_(2)(Zr_(0.7)Ce_(0.3))_(2)O_(7)(LZ7C3)*** measured ionic conductivity and atomistic simulation revealed that the oxygen ion diffusivity in LZ7C3 grains is two orders of magnitude lower than that in conventional 8 wt.%yttria-stabilized zirconia(8YSZ)*** is due to the relatively high energy barrier for oxygen hopping in *** addition,it was found that enhancing the order distribution of cations is a strategy to reduce the intrinsic oxygen diffusion of pyrochlore-type *** the other hand,we observed that La^(3+) cations segregate at the grain boundaries(GBs)of LZ7C3,which results in the electrostatic poten-tial at GBs being comparable to that in the ***,we found that the oxygen ion diffusion is facilitated at the GBs of LZ7C3 due to the stretched O-Zr/Ce bond and the low coordination at ***-ever,the segregations of Y^(3+)cations and the increase in the number of oxygen vacancies resulted in the formation of an electrostatic layer at the GBs of 8YSZ,which shielded the oxygen ion *** this,the oxygen ion diffusivity in LZ7C3 was still considerably less than that in conventional *** study offers a stepping stone toward utilizing pyrochlore-type LZ7C3 materials as advanced TBCs at high temperatures.

关键词： Oxygen ion diffusion La_(2)(Zr_(0.7)Ce_(0.3))_(2)O_(7) Pyrochlore structure Thermal barrier coatings

Expression of anti-apoptotic protein Bcl-2 and proapoptotic protein Bax after delayed paraplegia induced by ischemia/reperfusion injury

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2006年第6期1卷 497-501页

作者： Bibo liu Miao liu Duoning Wang Wei Ma shengli Dang Department of Orthopaedics First Affiliated Hospital of Medical School Xi＇an Jiao Tong University Xi＇an 710061 Shaanxi Province China

BACKGROUND： Operation of spine does not involve in spinal cord; however, spinal cord injury occurs at post-operation induced by unclear factors. Meanwhile, after decompression of lumbar spinal canal, symptoms are severer and severer. In addition, during extirpation of cervical and lumbar intervertabral disc, spinal cord and its vessels are not damaged, but spinal cord injury is also suffered from patients with partial improvement. All statuses mentioned above are related to expressed changes of bc1-2 gene inhibiting apoptosis and bax gene accelerating apoptosis. BJECTIVE： To observe motor function of hindlimbs of ischemia/reperfusion model in rabbits at various time points after reperfusion and expressions of apoptosis correlated protein Bcl-2 and Bax. DESIGN： Completely randomized grouping design and contrast study SETTING： Department of Orthopedics, the First Affiliated Hospital of Medical School, xi＇an Jiao Tong University MATERIALS ： Forty-eight New Zealand white rabbits of both genders were randomly divided into sham operation group （n =24） and model group （n =24）, and then, rabbits in each group were observed at four time points： 8, 24, 72 and 168 hours after reperfusion, with 6 in each time point. Rabbit-anti-rabbit Bcl-2 antibody and rabbit-anti-rabbit Bax antibody were provided by Boster Company. The procedures were accordant to the kit introduction. METHODS ： The experiment was carded out at Laboratory of Orthopaedics of First Affiliated Hospital of Medical School, xi＇an Jiao Tong University from April to August 2005. （1） Delayed paralysis models of spinal cord after ischemia/reperfusion were established based on method of Zivin et al. Animals in sham operation group underwent an exposure of abdominal aorta but the aorta was not occluded. （2） Motor function of hindlimb was observed 8, 24, 72 and 168 hours after reperfusion. A grade of 0-5 was assigned to each animal （grade 0： no voluntary hind limb function; grade 5： normal hop; grades 0-3： paraple

关键词： spinal cord injury motor function First Affiliated Hospital New Zealand white rabbits Bax protein experimental animals analysis of variance abdominal aorta spinal canal time point method of bax gene