多孔陶瓷板中城市燃气预混燃烧的试验研究与数值计算

符号表尸可燃混合气体的密度。可燃混合气体的流速。轴向距离。Stefan－Boltzmann常数Tg混合气体的温度R通用气体常数ho多孔陶瓷材料的导热系数DO单元体的内径J单元体的壁厚Tin燃气入口端面的环境温度几单元体的壁温P混合气体压力Te。烟气出口端面的环境温度HO对流换热系数l单元体轴向全长。’积分变量A板面面积。板面孔的数量1引言多孔陶瓷板中的燃气预混燃烧具有热效率高，污染物排放量低的特点，符合九十年代人们对燃烧的要求，因此对多孔陶瓷板中的可燃气体的预混燃烧的研究逐渐成为了国际上的一个热点。目前国内有些厂家己在生产…     

Ultrasound/Optical Dual‐Modality Imaging for Evaluation of Vulnerable Atherosclerotic Plaques with Osteopontin Targeted Nanoparticles

Because of the high mortality of coronary atherosclerotic heart diseases, it is necessary to develop novel early detection methods for vulnerable atherosclerotic plaques. Phenotype transformation of vascular smooth muscle cells (VSMCs) plays a vital role in progressed atherosclerotic plaques. Osteopontin (OPN) is one of the biomarkers for phenotypic conversion of VSMCs. Significant higher OPN expression is found in foam cells along with the aggravating capacity of macrophage recruitment due to its arginine‐glycine‐aspartate sequence and interaction with CD44. Herein, a dual‐modality imaging probe, OPN targeted nanoparticles (Cy5.5‐anti‐OPN‐PEG‐PLA‐PFOB, denoted as COP‐NPs), is constructed to identify the molecular characteristics of high‐risk atherosclerosis by ultrasound and optical imaging. Characterization, biocompatibility, good binding sensibility, and specificity are evaluated in vitro. For in vivo study, apolipoprotein E deficien (ApoE^?/?) mice fed with high fat diet for 20–24 weeks are used as atherosclerotic model. Ultrasound and optical imaging reveal that the nanoparticles are accumulated in the vulnerable atherosclerotic plaques. OPN targeted nanoparticles are demonstrated to be a good contrast agent in molecular imaging of synthetic VSMCs and foam cells, which can be a promising tool to identify the vulnerable atherosclerotic plaques.     

关于弱势群体权利保护问题的几点思考

弱势群体是社会中经济贫困、能力贫困或受到法律、制度、政策排斥而导致权利贫困的人的概称。保护弱势群体包含了更多的道德、法律和人文因素，是法治国家的应有之义，也是衡量一个国家文明程度和人权状况的重要指标。     

现代高校图书馆为“弱势群体”服务的对策

分析了高校图书馆中的弱势群体及服务状况,阐述了高校图书馆为弱势群体服务的重要性,提出了高校图书馆为弱势群体服务的具体措施。     

抗坏血酸硬脂酸酯的抗诱变作用研究

采用小鼠骨髓细胞微核实验，对L-抗坏血酸硬脂酸酯（AS）在生物体中的抗诱变作用进行了研究．结果表明：AS剂量与微核率之间存在剂量反应关系，随AS剂量的增加，微核率呈下降趋势．     

An ALE approach to mechano‐chemical processes in fluid–structure interactions

Mathematical modeling and simulation of fluid–structure interaction problems are in the focus of research already for a longer period. However, taking into account also chemical reactions, leading to structural changes, including changes of mechanical properties of the solid phase, is rather new but for many applications is highly important area. This paper formulates a model system for reactive flow and transport in a vessel system, the penetration of chemical substances into the solid wall. Inside the wall, reactions take place that lead to changes of volume and of the mechanical properties of the wall. Numerical algorithms are developed and used to simulate the dynamics of such a mechano‐chemical fluid–structure interaction problem. As a proof of concept scenario, plaque formation in blood vessels is chosen. The arbitrary Lagrangian Eulerian approach (ALE) is chosen to solve the systems numerically. Temporal discretization of the fully coupled monolithic model is accomplished by backward Euler scheme and spatial discretization by stabilized finite elements. The numerical approach is verified by numerical tests, and effective methods to maintain mesh qualities under large deformations are described. For realistic system parameters, the simulations show that the plaque formation in blood vessel is a long‐time effect. The time scale of the formation is in the simulation of comparable order as in reality. Copyright © 2016 John Wiley & Sons, Ltd.     

大学生弱势群体的思想政治教育探析

在教育体制改革和高校扩招的影响下,社会、高校在处理大学生弱势群体问题时明显存在一些弊端。针对这些弊端,本文提出了解决大学生弱势群体问题的对策。     

CTA成像在下肢血管闭塞病变中的应用及与血管腔内疗效的关系

本文探讨计算机体层扫描血管造影(CTA)检查在下肢血管闭塞病变中的应用价值及与血管腔内疗效的关系。选取经数字减影血管造影(DSA)确诊的93例下肢血管闭塞病变患者,采用CTA检查,分析CTA诊断病变部位结果、血管狭窄程度及与DSA诊断结果的一致性,并探讨CTA征象与患者血管腔内疗效的关系。结果显示,CTA诊断下肢血管闭塞病变部位、狭窄程度与DSA诊断结果均具有较高一致性(P<0.05);病变血管长度>1.41 cm、血管狭窄程度4级、病变血管远端CT值>62.65 Hu、钙化性斑块是下肢血管闭塞病变血管腔内治疗失败的危险因素(P<0.05)。CTA检查是诊断下肢血管闭塞病变的可靠方法,通过检查患者病变血管长度、血管狭窄程度、远端CT值及管腔内粥样斑块性质,有助于降低治疗盲目性,提高血管腔内治疗成功率。     

Synchrotron study of metal localization in Typha latifolia L. root sections

Understanding mechanisms that control plant root metal assimilation in soil is critical to the sustainable management of metal‐contaminated land. With the assistance of the synchrotron X‐ray fluorescence technique, this study investigated possible mechanisms that control the localization of Fe, Cu, Mn, Pb and Zn in the root tissues of Typha latifolia L. collected from a contaminated wetland. Metal localizations especially in the case of Fe and Pb in the dermal tissue and the vascular bundles were different. Cluster analysis was performed to divide the dermal tissue into iron‐plaque‐enriched dermal tissue and regular dermal tissue based on the spatial distribution of Pb and Fe. Factor analysis showed that Cu and Zn were closely correlated to each other in the dermal tissues. The association of Cu, Zn and Mn with Fe was strong in both regular dermal tissue and iron‐plaque‐enriched dermal tissue, while significant (p < 0.05) correlation of Fe with Pb was only observed in tissues enriched with iron plaque. In the vascular bundles, Zn, Mn and Cu showed strong association, suggesting that the localization of these three elements was controlled by a similar mechanism. Iron plaque in the peripheral dermal tissues acted as a barrier for Pb and a buffer for Zn, Cu and Mn. The Casparian strip regulated the transportation of metals from dermal tissues to the vascular bundles. The results suggested that the mechanisms controlling metal localization in root tissues varied with both tissue types and metals.     

AS5643总线优化传输方法研究

针对AS5643总线传输等时数据包时所带来的不确定性问题,提出一种将总线周期分为等时和异步两部分时隙的优化传输方法,能在不影响确定性的前提下引入等时数据包传输。首先对引起不确定性问题的原因进行了分析,然后详细介绍了优化传输方法的原理及工程实现。该优化传输方法经实验证明是正确可行的,可应用于高度综合化的航空电子系统中。