综合大学和特色大学的国际参照与启示

本文通过对我国东西邻日本和印度及美国的综合大学和特色大学的考察,得出结论,其实高水平的一流大学并不一定就是学科齐全、规模庞大的综合大学,综合大学和学术水平、办学质量二者并无必然的关联。一所大学想成为高水平的一流大学最主要的是要实现学科的优化配置,并在综合化的基础上实现发展特色化。Based on an investigation made on some universities and characteristic universities in Japan,India and the United States,it has concluded that,in fact,a high level of first-class university is not necessarily a full academic subject and large-scale university.Universities and academic level and school quality are both not necessarily associated.If a university wants to become a high-level and first-class one,it's the most important for it to achieve optimal allocation of academic subjects and implement development characteristics on the basis of the integration

动态荷载作用下细砂岩流变损伤力学特性试验研究

选取软弱砂岩为研究对象,利用RLW-2000M型三轴流变试验机,测试砂岩试样的轴向应力-应变、轴向流变变形、径向流变变形,研究了动荷载频率和幅值对砂岩流变特性的影响;选取轴向应变为损伤变量,推导出损伤度的计算表达式,分析了各因素对损伤度的影响特性。研究结果表明:在动态荷载作用下,轴向与径向变形随着时间的推移而增大,滞回曲线会由稀疏变稠密;轴向、径向变形增量随动载幅值的增大而增大,而随着频率的增大呈减小的趋势;试样的损伤度在突变后趋于稳定,且随着动载幅值的增大而增大。研究结论为揭示动态荷载作用下细砂岩流变损伤演化规律提供科学依据。国家重点研发计划项目(2017YFC0404801);;国家自然科学基金项目(51509018

自发性户外探险活动的民事责任研究

目前,在我国户外探险大规模兴起和发展的过程中,频繁出现自发性户外探险产生意外事故的情况,暴露出我国在自发性户外探险领域中政府监管和法律制度的缺位问题。自发性探险活动在法律性质上属于自甘冒险行为,发起人探险过程中应当履行其先行的召集行为引起的作为义务。在认定民事责任时,需要准确分析户外探险侵权损害的因果关系。面对自发性户外探险事故频发的现状,政府部门应加强监管,同时完善相关的法律框架

浅析软弱岩体在应力场与渗流场耦合作用对应变及渗透系数的影响关系及其实际意义

强烈荷载所形成的应力场作用和强降雨导致的渗流场作用是加速软弱岩体变形破坏的重要诱发因素,是多数岩土工程事故的外在破坏的表现形式。加强砂岩的应变及渗透系数的研究关系到国家各类重点工程的成败兴衰。本文首先介绍了软弱岩体的内部组织结构与渗透系数的关系,接着进一步分析应力场和渗流场耦合作用下的应变与渗透系数的关系,对于保障我国各项重点工程的建设安全有着重要的理论和实际意义

An Ivestigation of HAP/Organic Polymer Composite Coating Prepared by Electrochemical Co-Deposition Technique (Ⅱ)Characterization of XRD,SEM and Mechanic Properties

通过电化学共沉积方法制备具有生物活性的有机高聚物 /钙磷陶瓷复合膜层。用 XPS、SIMS等对复合膜层的化学组分进行表征 ,证明少量有机高聚物可能在分子层次上掺杂形成有机高聚物 /羟基磷灰石复合膜层。对电沉积 HAP陶瓷膜层进行微刮痕实验表明 ,陶瓷膜层与金属基体的结合力得到显著改善Electrodeposition hydroxyapatite(HAP) coatings of ceramics were studied by Nano Indent. The bonding force between the coating and metal substrate was distinctly increased. The experiments about XPS and SIMS showed that there is the act of organic polymer enriching at negative. It ensues that minor organic polymer is compounded to HAP coatings at molecular level and forms that HAP/Organic polymer compound coating.国家自然科学基金资助项目 (2 9873 0 3 9

富血小板衍生物在口腔医学中的研究与应用

富血小板衍生物是将全血进行离心后得到的富血小板的物质,富含各种生长因子,可以促进骨组织和软组织的修复和再生。本文主要探讨富血小板衍生物在口腔医学领域的研究及应用现状

An Investigation of HAP/Organic Polymer Composite CoatingsPrepared by Electrochemical Co-Deposition Technique

首次提出在 NH4H2 PO4- Ca( NO3) 2 溶液中添加水溶性乙烯类有机高聚物 ,实现了通过电化学共沉积法制备具有生物活性的有机高聚物 /钙磷陶瓷复合膜层。用 XRD、SEM等对膜层的组分和形貌进行表征 ,证明陶瓷膜层表面形貌发生明显的变化。有机高聚物的引入 ,并不影响电沉积制备的羟基磷灰石 ( HAP)晶体在 ( 0 0 2 )晶面生长存在的晶面择优取向。体外细胞实验表明 ,HAP/有机高聚物复合膜层具有优良的生物活性An electrochemical co-deposition technique has been developed to prepare a hydroxyapatite (HAP)/organic polymer composite coating on Ti surface as new biomaterial of hard tissue. The composite coating of organic polymer and calcium phosphate is formed by adding a water soluble polymer of the ethylene series to NH 4H 2PO 4-Ca(NO 3) 2 solution when conducting an appropriate electrochemical co-deposition experiment. The XRD, SEM, XPS, SIMS and nano indent measurements were performed to characterize the morphology, composition, structure and surface stiffness of the composite coating. It was found that the morphology and surface hardness of the coatings showed a remarkable modification when introducing a minor polymer to HAP coatin, and the bonding force between the coating and metal substrate was distinctly increased. The incorporation of minor organic polymer into the HAP compound at molecular level will improve the mechanical properties and morphology of the composite coatings, and this may be helpful to raising its bio-activity.国家自然科学基金资助项目 ( 2 98730 39

海工高耐久自密实混凝土的研制

针对跨海桥梁工程特点与环境条件,采取七元组分设计混凝土配合比,通过限制骨料含量、采用低水胶比、复掺磨细矿粉与Ⅰ级粉煤灰以及外掺聚羧酸系高性能减水剂等技术措施,配制出适合海洋环境条件、中等强度等级、具有良好体积稳定性的高耐久自密实混凝土