Study on Underwater Acoustic Network Nodes Positioning Techniques

水声定位技术是当代国家安全保障和海洋资源开发的重要组成部分，它在保障国防安全和国民经济建设的顺利进行中起着重要作用。随着人类对水下探索研究工作的深入开展，所采用的研究手段越来越多，载人深潜器，水下机器人，海底油气管线布设，远程监控系统以及其它各种探测设备不断出现，水下高可靠性的导航定位在海洋发展中起着越来越重要的作用。 现有的高精度水声定位系统大多设备庞大、操作复杂，在海洋信息技术高速发展的今天，网络化的水声通信、水声监测体系已成为一种趋势，单独设计一套复杂的水声定位系统不再满足高效率科研和生产活动的要求，水声定位与水声通信、水声监测及其他水声网络的结合将是未来的发展方向。从长远来看，水声网...Acoustic positioning technology is an important part of the contemporary national security and marine resources development. It plays an important role in the protection of national security and the well progress of national economy. With the intensive research in the ocean exploitation, the research methods used becoming more and more, Deep-sea manned submersibles, remote operated underwater vehi...学位：理学硕士院系专业：海洋与环境学院海洋学系_海洋物理学号：2242007115418

Clinical analysis of perimenopausal women presenting initially with dry eye symptom

目的探讨围绝经期妇女的干眼症状与干眼病诊断的相关性。方法分析56例具有干眼症状的围绝经期妇女眼部检查的临床资料,观察主诉为干眼症状患者的干眼病确诊率及其关系。结果56例以干眼症状为主要表现的围绝经期妇女,确诊水液缺乏型干眼17例(30.4%),蒸发过强型干眼12例(21.4%),混合型干眼8例(14.3%);不能诊断干眼病的19例(33.9%),最终诊断为围绝经期综合征。结论围绝经期妇女干眼病确诊率较高(66.1%),但部分干眼症状可以只是围绝经期综合征的精神神经症状的一种表现,临床诊断干眼应慎重。 【英文摘要】 Objective Diagnosis and treatment of dry eye are important for improving living quality.Present paper was to investigate the correlation between dry eye manifestations and diagnosis of dry eye disease in perimenopausal women.MethodsThe clinical data of 56 perimenopausal women presenting initially with dry eye symptoms including ocular symptoms,slit-lamp examination,tear film break-up time,basal and reflex Schirmer test,vital staining(fluorescence and rose bangle),and meibomian gland dysfunction examination ..

中国航天电源技术的研究和发展

中国航天电源技术的研究和发展杨小安，李国欣（中国航天工业总公司，贵州５６３００３）我国自１９７０年４月２４日以第一枚“ＣＺ－１”（长征）运载火箭成功发射第一颗人造地球卫星“ＤＦＨ－１”（东方红），到１９９４年２月８日以“ＣＺ－３Ａ”运载火箭成功发射“...作者联系地址：中国航天工业总公

天然气净化厂的废水处理设计与运行

天然气净化厂废水水质、水量波动大且含有大量难降解物质,难以稳定达标。采用水解酸化—好氧工艺处理天然气净化厂废水,出水可以稳定达到《污水综合排放标准》(GB8978—1996)的一级标准,可回用于循环冷却、绿化、冲厕、道路冲洗等。介绍了生物处理工艺的主要设计参数、控制参数以及运行经验,为实现天然气净化厂废水处理的节能减排提供参考

一种硝化苯硼酸亲和色谱预柱及其制备和应用

本发明涉及亲和色谱柱，具体地说是一种硝化苯硼酸亲和色谱预柱及其制备和应用；预柱填料为硅胶基硝化苯硼酸，用于HPLC在线富集临顺二羟基化合物。本发明预柱除了具有的耐压和不溶涨的特点外，较未硝化苯硼酸功能基团对应的亲和色谱预柱具有保留强度大和保留适用 pH宽等优点，非常适于两柱联用的HPLC在线分析系统，定性定量结果好。带填

挠性基板光电互联结构的热应力可靠性研究

为了研究挠性光电互联结构在实际工程应用中的可靠性,建立了埋入光纤挠性基板光电互联结构有限元模型,根据光器件Telcordia GR-468标准加载热循环试验条件,对光电互联结构中的焊点应力、光纤应力和光电耦合效率进行仿真分析。热—结构仿真结果表明,焊点和光纤的最大等效应力均在安全范围内,光电耦合产生的最大损耗为0.7 dB,光电传输未受到显著影响,可以判定挠性光电互联结构在标准热循环作用下能够保证光电传输的稳定性

Effects of Ursodeoxycholic Acid and Retinoic Acid on the Cell Cycle and Differentiation of Human Osteosarcoma MG-63 Cells

以癌细胞诱导分化物维甲酸为平行对照,应用中药有效成份熊去氧胆酸处理人成骨肉瘤MG63细胞,观察比较熊去氧胆酸及其与维甲酸的组合对MG63细胞形态、细胞周期及分化的影响.实验结果显示,经熊去氧胆酸、维甲酸及其组合联合处理之后,MG63细胞体积增大,核质比例减少,形态趋于规则.细胞周期发生G0/G1期阻滞,G0/G1期细胞比例显著增加,而S期和G2/M期细胞比例则明显下降.细胞终末分化标志物I型胶原表达明显增强,骨结节形成数目增多,且结节结构更为典型.其中,熊去氧胆酸和维甲酸联合组对MG63细胞周期的阻滞及细胞终末分化指标I型胶原的表达、骨结节形成的诱导均强于单独处理组.结果表明,熊去氧胆酸具有与维甲酸相近似的诱导人成骨肉瘤MG63细胞分化的作用,并且两者组合具有协同诱导成骨肉瘤细胞分化的效果.In this study,the human osteosarcoma MG-63 cells were treated with ursodeoxycholic acid,retinoic acid.The combination of the two drugs was used to observe and to compare their effects on the morphology,cell cycle and differentiation of human osteosarcoma MG-63 cells.The results showed that after the treatment of ursodeoxycholic acid,retinoic acid and their combination,MG-63 cells became bigger.The proportion of nucleus to cytoplasm decreased and the cell morphology was more regular.The cell cycle of MG-63 cells was arrested at G0/G1 stage and the cells in this stage increased markedly,while the cells in S and G2/M stages decreased greatly.The expression of the terminal differentiation maker,collagen I,was upregulated.The number of bone nodule,which is another important terminal differentiation marker,increased and the morphology and structure of the bone nodules were typical.Compared with ursodeoxycholic acid and retinoic acid,their combination had better effects on the cell cycle arrest,the expression of collage I and the induction of bone nodules formation.From the above,a conclusion can be drawn that,ursodeoxycholic acid has similar effect on inducing human osteosarcoma MG-63 cells to differentiation.And their combination has better effect on the differention induction of MG-63 cells国家自然科学基金(30470877);; 福建省自然科学基金(C0310003)资