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系外地球科学卫星(ET)将通过采用空间大视场超高精度测光这一关键技术在国际上率先突破生命起源中的系外地球存在及其演化这一重大前沿科学问题. ET卫星将在日地拉格朗日L2点晕(Halo)轨道部署由6台广角凌星望远镜和1台微引力透镜望远镜构成的空间天文台, 结合凌星法和微引力透镜法, 利用空间超大视场和超高精度的光学测光观测, 首次发现富有重要意义、被广泛关注的系外地球, 并确定其发生率, 对目前了解甚少的类地行星和流浪行星进行国际上第一次大规模的种群普查, 首次发现流浪地球, 并确定其发生率, 揭示类地行星和流浪行星起源, 为地外生命探寻提供候选者和新方向. ET卫星的观测结果、统计研究以及和对理论的检验将回答系外地球在宇宙中有多普遍, 类地行星是如何形成和演化的, 流浪行星又是如何起源的这些亟待解决的前沿科学问题. 对ET卫星发现的系外地球样本的后随观测, 将精确测量其质量、密度和大气成分, 有助于深入分析宜居性特征. 此外, 对ET新发现的大量各种系外行星样本的研究, 以及对理论的检验将推动这些种类的行星形成和演化规律的更深入认识, ET的大量高精度、高频次和长基线测光数据将推动星震学、银河系考古学、时域天文学、双星和双星黑洞等领域的研究.

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腹腔镜手术是近年来发展迅速的一种微创手术方式, 其在肝胆胰脾手术中的应用也越来越广泛。对比常 规的开腹治疗, 腹腔镜手术有着损伤小、康复快、术后痛苦少的优点因此备受医护人员和患者好评。但是, 对于初学 者而言, 腹腔镜手术难度较大, 技巧需求也较高。因此, 本文将分别从手术策略和手术技巧两个方面, 对腹腔镜肝胆 胰脾手术进行探讨。 [ABSTRACT FROM AUTHOR]

术后疼痛是临床普外科术后的一种典型症状, 由于个体差异和因子作用, 部分病人疼痛敏感性提高, 疼 痛严重, 导致病人在恢复过程易出现烦躁、压抑、焦虑不安等消极心境, 影响预后。而术后疼痛形成原因错综复杂, 且大多与病人自身、年龄和治疗的程度有密切管理, 如不能及早采取相应干预, 严重可威胁生命安全, 影响生存能 力。因此, 开展患者管理干预已迫在眉睫。并基于此, 本章中着重研究了对普外科术后病人的术后疼痛形成原因与管 理干预。 [ABSTRACT FROM AUTHOR]

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An oil-in-water polymer microsphere nano-profile control agent with water as the dispersed phase was prepared by miniemulsion polymerization using styrene (St) and butyl acrylate (BA). The morphology,particle size and temperature and salt resistance of the nanoprofile control agent were characterized by means of transmission electron microscopy (TEM) and dynamic light scatterometer (DLS). In addition, the injectability ? plugging and migration properties of the prepared nano-profile control agent were evaluated by sand filling tube experiment. The results showed that the prepared nano-profile control agent had a regular spherical structure，and the particle size of the microspheres was about 250 nm. After treating the prepared nano-profile control agent at high temperature of 90 °C and within the mineral water of 100 000 mg/L，the spherical structurewas not destroyed，and no demulsification and flocculation phenomenon were observed. The sand filling tube experiment showed that the nano-profile control agent exhibited excellent injectability? plugging and migration property. [ABSTRACT FROM AUTHOR]

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