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Vertical structure of tidal currents in the Xuliujing Section of Changjiang River Estuary

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Acta Oceanologica Sinica 2023年第2期42卷 44-55页

作者： Zhigao Chen Ya Ban Xiaoye Chen dajun li Shengping Wang Faculty of Geomatics East China University of TechnologyNanchang330013China Chongqing Academy of Metrology and Quality Inspection Chongqing401120China Nanjing White Shark Surveying and Mapping Technology Co. LtdNanjing210038China Key Laboratory of Marine Environmental Survey Technology and Application Ministry of Natural ResourcesGuangzhou510300China

Three long-term fixed acoustic Doppler current profilers were first used for investigating the vertical structure of tidal currents in Xuliujing Section of Changjiang River ***,three different periods(spring,summer and fall)were also considered for investigating seasonal *** semi-diurnal tides were the most energetic,with along-channel speed of up to 80 cm/s for M_(2)constituent,which dominates at all stations with percent energy up to 65%–75%during *** shape of tidal ellipses of the most energetic semi-diurnal constituent M_(2)showed obvious polarization of the flow paralleling to the riverbank,with the minor semi-axis being generally less than 20%of the major *** maximum velocity of mean current is appeared in top layers at all the three stations,and the velocity decreased with the *** seasonal variations of direction are also observed,which is probably caused by complex local topography since the erosion and deposition in *** vertical variation of four parameters of M_(2)ellipses,agreed well with the optimally fit frictional solutions in top and middle ***,there was an obvious difference between frictional model and observed data in the lower water *** are probably on account of stratification,which strengthens in summer and fall due to the freshening influence of the Changjiang River Estuary outflow.

关键词： vertical structure seasonal variations tidal current mean current acoustic Doppler current profiler Changjiang River Estuary

The New Donator to the Forbidden City Museum

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China & The World Cultural Exchange 2006年第11期72卷 14-15页

作者： li dajun

In mid-August, the ceremony to donate the oil painting ＂The Year 1974 ·the Yangtze River＂ by Mr. Wu Guanzhong was held in the Jingren Palace in the Forbidden City Museum. Theother two donations were ＂Village by th... 详细信息

关键词：故宫博物馆油画作品捐赠仪式 2006年吴冠中

Alternative splicing and expression of the insulin-like growth factor (IGF-1) gene in osteoblasts under mechanical stretch

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Chinese Science Bulletin 2006年第22期51卷 2731-2736页

作者： XIAN Chengyu WANG Yuanliang ZHANG Bingbing TANG liling PAN Jun LUO Yanfeng JIANG Peng li dajun Bioengineering College Research Center of Bioinspired Materials Science and Engineering Key Laboratory for Biomechanics & Tissue Engineering Under The State Ministry of Education Chongqing University Chongqing 400044 China

(IGF-1 ) 像胰岛素的生长因素 1 支持造骨细胞区别和骨头形成，和它的表示被机械段导致，因此， IGF-1 被认为连接机械刺激和本地织物回答的一个受动器分子。在这研究，一台机械拉长设备被设计把生理的水平静电干扰或周期的拉长刺激用... 详细信息

(IGF-1 ) 像胰岛素的生长因素 1 支持造骨细胞区别和骨头形成，和它的表示被机械段导致，因此， IGF-1 被认为连接机械刺激和本地织物回答的一个受动器分子。在这研究，一台机械拉长设备被设计把生理的水平静电干扰或周期的拉长刺激用于造骨细胞。IGF-1 mRNA 的不同 isoforms 被 RT-PCR 用各自的教材从房间放大，这些放大产品被定序。产品被发现被造骨细胞有选择地在拉长刺激下面生产的拼接的 IGF-1 的 iso 形式。ThisIGF-1 isoform 与原来在肌肉细胞被识别的 mechano 生长因素(MGF ) 有相同顺序。肝类型 IGF (***-1 ) 和在在段刺激下面的造骨细胞的 MGF 的表示的规定进一步用半量的 RT-PCR 被学习。Stretchstimulation 被发现 IGF-1 (***-1 和 MGF ) 的表示到职业人员警句，并且为两 isoformsexpression，更多被周期的段有效地比静态的段刺激。MGF 仅仅在受到机械段的造骨细胞被检测，建议 MGF 是段敏感生长因素。MGF 的表示比 ***-1 的早达到顶点，它类似于他们在肌肉的规定并且作为在肌肉房间在骨头建议了 MGF 和 ***-1 的类似的角色。在造骨细胞的 MGF 和 ***-1 的功能将被进一步试验性的研究建立。

关键词：胰岛素类生长因子-1 IGF-1 成骨细胞拉伸

Location and expression of neurotrophin-3 and its receptor in the brain of human embryos during early development

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Neural Regeneration Research 2008年第12期3卷 1277-1280页

作者： Jian li Yongjie Mi dajun Ma Department of Human Anatomy Histology and Embryology Chengdu Medical College Chengdu 610083 Sichuan Province China

BACKGROUND： Cell culture in vitro trials have demonstrated that neurotrophin-3 （NT-3） can enhance the survival of sensory neurons and sympathetic neurons, and can also support embryo-derived motor neurons. This effect is dependent on nerve growth factor on the surface of cells. Understanding the role of NT-3 and its receptor in the early development of human embryonic brains will help to investigate the correlation between early survival of nerve cells and the microenvironment of neural regeneration. OBJECTIVE： To observe the proliferation of cerebral neurons in the development of human embryonic brain, and to investigate the location, expression and distribution of NT-3 and its receptor TrkC during human brain development. DESIGN, TIME AND SETTING： An observation study on cells was performed in the Department of ttuman Anatomy, Histology and Embryology, Chengdu Medical College in September 2007. MATERIALS： Fifteen specimens of flesh human embryo, aged 6 weeks, were used in this study. METHODS： The proliferation of cerebral neurons was detected using proliferating cell nuclear antigen, and the immunocytochemistry ABC technique was applied to observe the location, expression and distribution of NT-3 and its receptor TrkC in the brain of the human embryo. MAIN OUTCOME MEASURES： Location, expression and distribution of NT-3 and its receptor in the brain of the human embryo. RESULTS： In the early period （aged 6 weeks） of human embryonic development, proliferating cell nuclear antigen-positive reactive substances were mainly observed in the nucleus of the forebrain ventricular zone and subventricular zone, and the intensity was stronger in the subventricular zone than the forebrain ventricle. NT-3 positive reactive substance was mainly distributed in the cytoblastema of the forebrain neuroepithelial layer and nerve cell process, while TrkC was mainly distributed in the cell membrane of the forebrain ventricular zone and subventricular zone. During embryonic development,

关键词： neurotrophin-3 TrkC human embryo brain development

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襄阳北编组站增建上行系统工程设计分析

铁道工程学报 2022年第10期39卷 77-81,104页

作者：李大军中铁第四勘察设计院集团有限公司武汉430063

研究目的:针对襄阳北编组站衔接线路主要技术标准不一致、没有预留上行系统条件等问题,对编组站上下行系统作业分工、平面布置、折角车流、线路疏解和施工过渡等方面进行深入研究和探讨,提出新的思路。研究结论:(1)襄阳北站上下行系统... 详细信息

研究目的:针对襄阳北编组站衔接线路主要技术标准不一致、没有预留上行系统条件等问题,对编组站上下行系统作业分工、平面布置、折角车流、线路疏解和施工过渡等方面进行深入研究和探讨,提出新的思路。研究结论:(1)襄阳北站上下行系统采用不平衡作业分工,可充分利用既有设施和设备,减少对运营的干扰;(2)采用反到进路将西北向折角列车引入上行出发场进行列车增减轴作业、上下行系统各3条调车线兼交换线组成交换场进行折角车流处理,可有效缩短列车在枢纽内的作业行程,减少机车取送车次数以及对其他技术作业的干扰,提高车站作业效率和能力;(3)施工过渡设计减少联锁软件过渡次数,可有效缩短施工周期,消除安全隐患;(4)本研究结论可供新建或改建编组站方案借鉴。

关键词：编组站平面布置线路疏解折角车流施工过渡

STRUCTURE CHARACTERISTICS OF MICROALLOYING AS-CAST MARTENSITIC CAST IRON

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Acta Metallurgica Sinica(English Letters) 1991年第9期4卷 179-183页

作者： ZHANG Jinghui li dajun ZHAO Jiuzhou JIA Jun Harbin Institute of Technology,Harbin,Chinali Jianhui Heilongjiang Association for Science and Technology,Harbin,China Harbin Inst of Technology Harbin China

The microstructure and martensite substructure of as-cast martensitic high-Cr cast iron by injection microalloying have been studied by usig SEM and *** relationship between distribution of alloying elements and phase formation of carbide,as well as various branching and distortion of carbide,have been analysed by X-ray diffractometer and EPMA.

关键词： high-Cr cast iron microalloying martensite substructure carbide

Chinese Ambassadors Review China-Thailand Diplomatic Relations

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China & The World Cultural Exchange 2015年第9期81卷 41-42页

作者： li Ying Ming dajun

On July 18, four former Chinese ambassadors to Thailand and their wives attended an event celebrating the 40th anniversary of China-Thailand diplomatic ties, held at China Culture Center in Bangkok. They recalled events and stories happening in the course of the development of the bilateral relations and expressed wishes for the continued friendship between Chinese and Thai *** are here because of love and the 40th anniversary of China-Thailand diplomatic ties. It is a rare opportunity for the four former Chinese ambassadors and their wives to gather here in Bang- kok,＂ the chairman of the Committee for China-Thailand Cultural Promotion said at the opening ceremony for a series of celebrative events.

关键词：外交关系中国泰国评论文化中心庆祝活动开幕式委员会

Entropy Error Model of Planar Geometry Features in GIS

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Geo-Spatial Information Science 2003年第2期6卷 20-24页

作者： li dajun GUAN Yunlan GONG Jianya DU Daosheng li dajun,Ph.D candidate, National Laboratory for Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University,129 Luoyu Road, Wuhan 430079,China. National Laboratory for Information Engineering in Surveying Mapping and Remote Sensing Wuhan University 129 Luoyu Road Wuhan 430079 China

Positional error of line segments is usually described by using "g-band", however, its band width is in relation to the confidence level choice. In fact, given different confidence levels, a series of concentric bands can be obtained. To overcome the effect of confidence level on the error indicator, by introducing the union entropy theory, we propose an entropy error ellipse index of point, then extend it to line segment and polygon, and establish an entropy error band of line segment and an entropy error donut of polygon. The research shows that the entropy error index can be determined uniquely and is not influenced by confidence level, and that they are suitable for positional uncertainty of planar geometry features.

关键词： union entropy entropy error ellipse entropy error band entropy error donut

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认知视阈下高校德育的困惑及对策

国家教育行政学院学报 2013年第12期 34-38页

作者：李达军内江师范学院四川内江641112

建设社会主义和谐社会,需要通过思想政治教育促进公民不断完善自身道德品质。大学生群体素质的全面提高势必会对未来社会发展起到极大影响作用,但目前中国高校普遍推行的认知德育模式对改革大学生思想政治教育存在制约瓶颈,如何通过观... 详细信息

建设社会主义和谐社会,需要通过思想政治教育促进公民不断完善自身道德品质。大学生群体素质的全面提高势必会对未来社会发展起到极大影响作用,但目前中国高校普遍推行的认知德育模式对改革大学生思想政治教育存在制约瓶颈,如何通过观念更新、对象定位、素质提升对学生思想政治教育进行改革,以促进大学生思想道德意识的健康发展,是当前高校德育工作者必须认真思考的重大现实问题。

关键词：认知德育困惑对策