一般单调变分不等式的一个改进的预估-校正算法

最近何炳生等提出了解大规模单调变分不等式的一种预估-校正算法,然而,这个方法在计算每一个试验点时需要一次投影运算,因而计算量较大．为了克服这个缺点,我们提出了一个解一般大规模g-单调变分不等式的新的预估-校正算法,该方法使用了一个非常有效的预估步长准则,每个步长的选取只需要计算一次投影,这将大大减少计算量．数值试验说明我们的算法比最新文献中出现的投影类方法有效．     

Seismic responses for multi-storeyed buildings composed of nonorthogonal members under bi-directional horizontal earthouake ground motions

This paper presents a method for analyzing both linear and nonlinear seismic responses of multistoreyed buildings composed of nonorthogonal structural members under the action of bi-directional horizontal earthquake waves. Different kinds of restoring force model are used. An efficient computer programme for the computation of nonlinear seismic response of the structure was worked out. In order to illustrate the application of this method, an example of a ten-storeyed building of such sort is given.     

金属基仿生超滑表面制造及其应用

金属是人类社会赖以生存和发展的重要物质基础,是构成现代文明社会的支撑材料,增加金属材料的特殊性能,拓宽金属材料的应用范围,已经成为自然科学交叉研究的热点。受自然界启发,研究人员通过探究猪笼草口缘区的超滑行为,在微/纳米结构基底中注入低表面能润滑液,形成固液复合涂层,设计并制备出具有特殊润湿性的仿生超滑表面,显现出优异的自愈、防冰、防污、耐腐蚀、抗生物黏附、自清洁等性能。该方法为金属基体上设计构建仿生超滑表面,并实现其表面多功能性,进而为其在海洋防污、生物医疗、航空航天、制冷、工业生产等领域实现更广泛的应用提供了可能。本文从仿生超滑表面的设计原理、制备工艺、金属基体仿生超滑表面的应用以及未来发展趋势和挑战四个方面对金属基体仿生超滑表面的研究进展进行了综述。     

Photo-fabrication of surface relief gratings on polymer films

Surface relief gratings were optically produced on a number of azobenzene-based polymer films. The surface grating formation was investigated by monitoring the diffraction efficiency and using atomic force microscopy. The effect of the structure of the chromophores on surface modulation was investigated. The surface deformation process depended on the polarization state of the writing beams. The localized variations of the light intensity and alteration of the resulting electric field polarization were essential writing conditions to the formation of the surface relief gratings. The surface pattern from straight edge diffraction established that the surface profile of the recorded gratings is proportional to negative gradient of the intensity pattern incident on the polymer film.     

吹扫捕集-气相色谱-质谱法测定海洋沉积物中挥发性有机物

采用吹扫捕集-气相色谱-质谱（P＆T-GC-MS）法测定了海洋沉积物中挥发性有机物（VOCs）的含量,优化了吹扫条件。54种VOCs在4-40μg/L范围内具有良好的线性关系,浓度测量的相对标准偏差为2．67％。14．2％,VOCs的样品加标回收率多在87．0％-127％之间,栓出限为0．07-1、87μg/kg（干重）之间。该方法亦可应用于土壤中VOCs的测定。     

水体中挥发性有机污染物的应急监测

建立了以吹扫捕集-气相色谱-质谱法为主的挥发性有机物(VOCs)应急监测方法。采用内标法对环境水体中的VOCs含量进行检测,54种VOCs的回收率为93.7%~136%,相对标准偏差为2.67%~14.2%,检出限为0.07~1.87μg/L。同时应用相对响应因子(RRF)快速定量数据库对水样中VOCs的含量进行估算,通过与内标法测量值比对,验证了数据库用于水体污染事故中VOCs应急监测的可行性。     

Assessment of ultrasound pulsation loops for measurement of local pulse wave velocity of carotid artery

Flow-area (QA) method and ln(diameter)-velocity (ln(D)U) methods based on si-multaneous measurements of velocity (U) and arterial diameter (D) using ultrasound ...