29 research outputs found

    Application of Raman Spectroscopy for Analysis in Radiosensitivity of Total Protein of Nasopharygeal Carcinoma Cells

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    本文以鼻咽癌细胞株CnE2为放射敏感性的研究对象,经不同剂量X射线照射及不同时间培养后分别提取总蛋白,用共聚焦显微拉曼光谱仪检测其拉曼光谱。统计分析表明:被测样品的拉曼光谱中观察到一些可以归属于蛋白质物质的较为明显的基团频率振动峰;不同剂量的X射线照射后,总蛋白质的平均拉曼光谱与对照组谱形基本一致,但与对照组间的光谱存在着对应峰信号强度的不同。实验提示:照射后谱峰强度的增大或减小,提示着相关物质含量有所改变。分析照射后癌细胞总蛋白拉曼光谱的变化情况,结合数学统计方法,以探寻放射敏感性的特征拉曼标志,可以作为研究肿瘤放射敏感性的手段之一。To study the effects of total protein of nasopharyngeal carcinoma cell line CNE2 treated by different doses of X-ray irradiation.The total protein is extracted from the cell line and detected by confocal micro-Raman spectroscopy.Both t test and support vector machine are employed via SPSS and LIBSVM software packages for statistical analysis of Raman spectrum.The results show that several Raman bands assigned to total protein can be detected; and the X-ray irradiation have various effects on different components in total protein,and related to the radiation dose.It was indicated that in spite of no significant diversification on structures of protein,the content may be varied during irradiation.国家自然科学基金项目(11104030); 福建省自然科学基金项目(2011J01153

    2011中国戏剧的孟冰年

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    由文化部艺术司、总政宣传部艺术局和中国剧协联合主办的孟冰戏剧作品研讨会于2011年11月5日在京召开。总政宣传部副部长黎国如,中国作协党组成员、副主席廖奔,文化部艺术司司长董伟,中宣部文艺局副局长孟祥林,中国剧协分党组副书记、秘书长刘卫红以及胡可、徐晓钟、阎肃、仲呈祥等50位戏剧界专家、学者出席了本次研讨会。与会专家和学者结合刚刚结束的“红旗飘飘——孟冰戏剧作品展演“,对孟冰创作的43部戏剧作品进行了研讨,并对他40多年来潜心深入生活、注重学习、善于借鉴、勤奋写作的态度给予了肯定。孟冰积极寻求对现实主义创作的发展与突破,努力追求现实主义的多样性、包容性和开放性,推出了《毛泽东在西柏坡的畅想》、《寻找李大钊》、《谁主沉浮》等震撼人心的话剧作品,为戏剧舞台表现重大革命历史题材提供了新的成功经验。本刊选发了部分专家学者的文章,以飨读者

    Analysis of Resistance Characteristics of Free Fall Penetration Test and Inversion of Mohr-Coulomb Strength Parameters

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    开展陌生区域地面力学的远程、广域、快速勘测以评估车辆的越野机动性,在民用和国防等研究领域提出了迫切的需求。但目前现有的天基遥感、空基物探等技术手段属于非接触、原位勘测,只能反演部分地质信息,无法准确、快速获取地面力学参数。中科院力学所创新性提出了自由落体式贯入触探的技术手段,以突破陌生区域地面力学远程、广域、快速勘测的技术瓶颈。 自由落体式贯入触探的基本原理是贯入触探仪(贯入仪)在重力作用下获得贯入速度和动能,在贯入过程中测量贯入阻力和加速度随深度/时间的变化数据,但此测量值并不能直接获得土壤的物理力学参数,需根据贯入阻力来建立对应的参数反演方法。然而,贯入阻力与土壤力学参数的物理关系,特别是Mohr-Coulomb强度参数(黏聚力、内摩擦角)间的关系还不十分清楚。此外,当贯入速度较高时,土壤中会出现弹孔扩张现象,贯入仪与土壤的接触面积不断变化,导致了理论计算的困难。以上复杂因素导致现有的参数反演方法大都存在经验依赖性强、物理图像不清晰等问题。为此,本文针对自由落体式贯入触探开展了数值模拟及理论分析工作,对自由落体贯入过程中的贯入阻力特性及Mohr-Coulomb强度参数的反演进行了研究。 本文首先基于耦合欧拉-拉格朗日算法建立了描述自由落体贯入过程的大变形有限元分析模型,得到了贯入过程中土体应力、应变及速度场的分布规律,验证了不同初始贯入速度下土壤中存在的弹孔扩张现象。仿真结果表明,贯入过程中存在一个速度阈值,当贯入速度低于速度阈值时,贯入阻力中的静态阻力占主导地位;当贯入速度超过速度阈值时,贯入阻力中存在比较明显的动态阻力。对于给定的贯入仪-靶材组合,本文给出了一种利用数值模拟计算结果确定速度阈值范围的方法。进一步的参数分析表明:静态阻力关于土壤泊松比、弹性模量、Mohr-Coulomb强度参数以及贯入仪-土壤接触界面摩擦系数单调递增,而与土壤密度无关。 其次,本文改进了Feldgun等人提出的动态空腔膨胀模型,基于改进后的模型从理论上分析了贯入过程中的弹孔扩张现象,并计算了速度阈值的具体数值。建立了贯入仪的运动控制微分方程,提出了描述贯入过程的分阶段模型与简化模型。模型预测结果与数值模拟的计算结果符合得较好,以仿真得到的最大贯入深度为基准,分阶段模型的预测误差均小于10%,最小误差仅为2.26%。通过引入形状因子解释了理论模型与数值模拟之间静态阻力存在的偏差。 最后,本文利用自由落体式贯入触探获得的阻力-速度曲线、加速度时程曲线,基于改进后的动态空腔膨胀模型对土壤的Mohr-Coulomb强度参数建立了新的反演方法,该方法解决了现有半经验反演方法中经验依赖性强、物理图像不清晰的问题,为复杂地质环境下土壤Mohr-Coulomb参数的快速确定及土壤承载力评估提供了新的解决方案。</p

    一种含多面体寡聚倍半硅烷试剂的杂化整体材料的制备

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    本发明涉及高分子领域,具体涉及一种基于自由基聚合制备有机-无机杂化多孔整体材料的方法,本发明首先是将含有多个双键的多面体寡聚倍半硅烷试剂和引发剂在致孔剂中超声溶解,在一定的温度下发生自由基聚合反应,原位形成多孔的杂化整体材料,然后将含有引发剂和有机功能单体的溶液通入整体材料,在一定温度下将有机功能单体化学键合在整体材料表面上,最终制备成具有不同表面性质和功能的杂化整体材料。所述的制备方法具有操作简便快速,反应条件温和等优点,另外还可以根据不用的应用要求选择不同的有机功能单体,无需调节致孔体系,即可制备多种有机-无机杂化整体材料

    Template-induced crystallization of charged colloids: a molecular dynamics study

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    By using a large enough number of particles and implementing a parallel algorithm on the CUDA platform, we have performed brute-force molecular dynamics simulations to study the template-induced heterogeneous crystallization in charged colloids. Six kinds of templates, whose patterns include the planes of fcc(100), fcc(110), fcc(111), bcc(100), bcc(110) and bcc(111), have been implanted into the middle of the simulation box. Except the fcc(111) template, whose structure benefits not only fcc but also hcp crystals resulting in a similar behavior to homogeneous crystallization, bcc-type templates favor the formation of bcc crystals and bcc-like precursors while fcc-type templates favor the formation of fcc crystals and fcc-like precursors. Therefore, for fcc(100) and fcc(110) templates, heterogeneous crystallization will definitely result in a fcc crystallite. However, the results of heterogeneous crystallization that are induced by bcc-type templates are subtly different at different state points. At the state points where the interaction strength of charged colloids is weak and the fcc phase is thermodynamically stable, the bcc crystals formed with the promotion of bcc-type templates are not stable so as to tend to transform into fcc or hcp crystals. When the interaction strength of charged colloids is high, the predominant bcc crystals formed with the promotion of bcc-type templates can always persist within the time scale of simulation although not bcc but fcc crystals are thermodynamically stable

    Click polymerization for preparation of monolithic columns for liquid chromatography

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    In recent years, polymerizations based on click reactions (thiol-ene, thiol-yne, thiol-Michael, thiol-epoxy and amine-epoxy) have been utilized to prepare monolithic columns. These polymerization systems are easily carried out under mild conditions. Either hybrid or organic monolithic columns fabricated by click polymerization demonstrated homogeneous network structures. For separation of small molecules, the column efficiencies, such as plate height with less than 10 gm, have been greatly improved comparing with organic monolithic columns prepared with free radical polymerization. In this review, we will summarize recent progress on the preparation of monolithic columns and their chromatographic performances. (C) 2016 Elsevier B.V. All rights reserved
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