土-结构相互作用对储液结构动力反应的影响研究

在对大型工程结构进行地震反应分析时土-结构相互作用通常不可忽略,然而,结构本身巨大的体量及考虑土-结构相互作用后引入的大范围土域模型导致计算规模通常十分庞大,由此引起的计算效率低下问题已成为制约此类结构性能分析的关键因素。该文提出一种新型土-结相互作用分析方法,并基于此实现了大型结构考虑土-结构相互作用的高效地震反应分析,建立不同接触状态下的单元法向和剪切相对位移分解方法;采用三维无厚度Goodman接触面单元格式对土与结构的接触行为进行描述,并通过插值方法对单元非线性变形进行描述,推导出隔离非线性的接触面单元控制方程;在此基础上,建立了大型工程结构考虑土-结构相互作用的整体式计算模型和高效地震反应分析方法。由于该文方法在每次迭代求解过程采用Woodbury公式计算结构响应,其仅需对一个规模极小的局部非线性矩阵进行迭代更新,避免了传统方法所需的结构大规模整体刚度矩阵实时更新分解,因而能够大幅度提高结构地震反应分析效率,数值算例验证了该文方法的有效性及高效性。

     

An international quality assurance scheme for the quantitation of daidzein and genistein in food,urine and plasma

This quality assurance (proficiency testing) scheme was commissioned to enable the Food Standards Agency (FSA) to determine the quality of analytical results submitted by researchers measuring the concentrations of phytoestrogens in foods and biological fluids in FSA-funded research projects, and also, to demonstrate that FSA-funded laboratories are producing consistent and precise results. Non-FSA-funded laboratories from around the world were also invited to join in the scheme to increase the number participants. A secondary objective was to highlight the most successful methodologies used to analyse phytoestrogens.     

陶瓷上仿古电镀

陶瓷上仿古电镀是将青白色的陶坯经电镀、着色,最终使之成为古色古香的陶瓷精品的工艺。本文介绍了陶瓷性能,镀前处理,有关电镀及氧化着色的工艺流程和操作规范,并详述了相应的工艺配方。     

绿色环保橡胶硫化配方研究

针对硫磺、促进剂M(2-巯基苯并噻唑)在橡胶制品加工中对环境的污染和对工人健康的危害，研究了硫磺、硫化剂DCP(过氧化二异丙苯)、硫化促进刑M、促进剂CZ(N-环己基-2-苯并噻唑次磺酰胺)在橡胶制品加工中的应用，从环保的角度进行了新的配方设计，并进行了性能测试。结果表明：同等务件下，生产相同的产品胶板，使用硫化剂DCP及促进剂CZ的制品综合性能要优于使用硫磺和促进刑M的制品，且有利于环保。     

尼龙斜交载重轮胎早期损坏原因及解决方法探讨

针对尼龙余交载重轮胎使用过程中出现的早期损坏，分析了其使用因素和设计因素，从配方设计、结构设计等方面提出了相应的解决方法。同时认为加强工艺控制与结构、配方设计对轮胎性能的影响同等重要。     

影响陶瓷餐具中温釉铅溶出量几个因素的探析

对陶瓷餐具中温釉在配方、熔块制各、氧化物、着色剂添加量、烧成方式和烧成温度几方面的试验，分析和探讨了以上因素对陶瓷餐具中温釉铅溶出量的影响，提出了在陶瓷中温釉生产中应该注意及改进的几个方法。     

Impact of Divalent Ions on Heavy Oil Recovery by in situ Emulsification

Many reservoir formation brines are characterized by high salinity and contain high concentrations of divalent ions such as calcium, magnesium, and potassium. These challenging conditions can render the surfactants ineffective during chemical flooding for enhanced heavy oil recovery. Various brine types can have an impact on the stability of emulsions generated with chemicals as chemicals have various resistant levels toward hard divalent ions and salinities. To investigate the impact of brine hardness on heavy oil-in-water emulsion stability, glass tube experiments, microscopic visualization and sandpack flooding experiments, and Hele-Shaw visualization experiments were conducted in this study under low-salinity/hard-brine, high-salinity/hard-brine conditions using commercial chemicals, which are designed for specific reservoir brine conditions. Recovery results demonstrated that complex colloidal solution introduced in the previous study with silica and Dodecyltrimethylammonium bromide (DTAB) along with screened chemicals from glass tube tests in this study can enhance heavy oil recovery significantly with an addition of low concentration of xanthan gum (Lee and Babadagli 2018). The results confirmed the robustness of the complex colloidal solution formula to enhance oil recovery with low concentration of polymer under any reservoir brine conditions. The study also demonstrates the potential of polymer as an emulsion stabilization additive for enhanced heavy oil recovery by in situ emulsion generation. Polymer effects seemed to be particularly dominant under the low-salinity conditions than high-salinity conditions.     

电力滤波节电率的估算及应用

介绍了电力滤波节电率的求解方法、估算公式的推导,列出了计算结果表,并对估算公式进行了举例说明。     

布地奈德治疗婴幼儿哮喘40例疗效观察

目的对比观察布地奈德联合博利康尼雾化溶液治疗婴幼儿哮喘的疗效。方法通过随机分组,对40例婴幼儿哮喘急性发作进行布地奈德加博利康尼雾化溶液雾化吸入治疗,另40例用甲基强的松龙静点加博利康尼雾化溶液吸入治疗,观察用药前、用药后患儿症状体征(呼吸困难、咳嗽、喘息、喘鸣音)改善情况。结果实验组治疗后1h各症状体征评分的改善分数为:呼吸困难1.1、咳嗽1.1、喘息1.4、喘鸣音1.4;对照组分别为0.9、0.7、1.0、0.9分;实验组各症状体征改善分数明显优于对照组(P<0.05)。结论对哮喘急性发作患儿,雾化吸入布地奈德和博利康尼雾化溶液联合应用疗效优于静点甲基强的松龙加雾化吸入博利康尼雾化溶液。     

5%甲氨基阿维菌素苯甲酸盐水乳剂的配方研究

通过对不同配方甲氨基阿维菌素苯甲酸盐(以下简称甲维盐)的水乳体系的测定和对乳化剂、抗冻剂及悬浮助剂的筛选,确定了5%甲维盐水乳剂的最佳配方,同时确定了适宜的加工工艺,即将水相加入油相的制备方法可使所得5%甲维盐水乳剂有较好的稳定性。并通过对5%甲维盐水乳剂稳定性影响因素的研究,发现不同含盐量(1000～5000 mg/L)和不同硬度(0～500mg/L)的水质对制剂的稳定性几乎没有影响,制剂表现出较好的稳定性。