浅议砖混结构房屋墙体产生温度裂缝的原因及防治

本论阐述了砖混结构房屋墙体温度裂缝的特征和成因.从现行规范,设计、施工以及具体工程措施论述了裂缝的预防及治理,为预防温度裂缝提供理论依据.     

中医药治疗湿热蕴结型痛风性关节炎的研究进展

痛风性关节炎(gouty arthritis)是由于嘌呤代谢紊乱和或尿酸排泄减少所引起的代谢性疾病,随着人们生活水平、饮食结构等改变,其患病率及发病率逐渐升高,近年来中医药在治疗痛风性关节炎取得不错的疗效,湿热蕴结证为痛风性关节炎常见证型,文章拟从中医药治疗痛风性关节炎湿热蕴结证作一概述。     

Termite colonies from mid-Cretaceous Myanmar demonstrate their early eusocial lifestyle in damp wood

Insect eusociality is characterized by cooperative brood care, reproductive division of labour and multiple generations of adults within a colony. The morphological specializations of the different termite castes from Burmese amber were recently reported, indicating the termites possessed advanced sociality in the mid-Cretaceous. Unfortunately, all the reported Cretaceous termites are individually preserved, which does not cover the behaviours of the cooperative brood care and multiple generations of adults in the nests of the Cretaceous termites. Herein, we report three eusocial aggregations from colonies of the oldest known Stolotermitidae, Cosmotermesgen. nov., in 100 Ma mid-Cretaceous Burmese amber. One large aggregation, comprising 8 soldiers, 56 workers/pseudergates and 25 immatures of different instars, additionally presents the behaviours of cooperative brood care and overlapping generations. Furthermore, taphonomic evidence indicates Cosmotermes most probably dwelled in damp/rotting wood, which provides a broader horizon of the early societies and ecology of the eusocial Cosmotermes.     

三仁汤加味联合HAART治疗HIV感染者湿热内蕴证的临床观察

目的:观察三仁汤加味联合高效抗反转录病毒疗法(HAART)治疗HIV感染者湿热内蕴证的临床疗效。方法:选取2014年1月至2014年12月期间防城港市中医医院收治的60例湿热内蕴证HIV感染者,随机分为对照组与试验组各30例,对照组给予单纯HAART治疗,试验组在HAART治疗的基础上加用三仁汤加味治疗,分别于观察起点与治疗6个月时对比2组患者的临床疗效、卡洛夫斯基积分及CD4+T淋巴细胞计数和血常规、肝肾功能等安全性指标。结果:治疗6个月后2组的症状体征积分均有所下降,试验组优于对照组(P0.05);2组患者的卡洛夫斯基积分及CD4+T淋巴细胞计数治疗前无差异(P0.05),治疗6个月后,治疗组的积分和计数增加,差异具有显著性(P0.05)。结论:三仁汤加味联合HAART可以改善湿热内蕴证HIV感染者的临床证候,提高生活质量和免疫功能。     

贮水池壁板的构造与制作

池壁板的结构形式一般有两种:两壁板间有搭接钢筋和两壁板间无搭接钢筋。前一种壁板的横向非预应力钢筋可承受部分拉应力,但外露筋易锈蚀,壁板间接缝混凝土捣固不易密实、府加强振捣。     

Effect of wall permittivity on electroviscous flow through a contraction

The electroviscous flow at low Reynolds number through a two-dimensional slit contraction with electric double-layer overlap is investigated numerically for cases where the permittivity of the wall material is significant in comparison with the permittivity of the liquid. The liquid-solid interface is assumed to have uniform surface-charge density. It is demonstrated that a finite wall permittivity has a marked effect on the distribution of ions in and around the contraction, with a significant build-up of counter-ions observed at the back-step. The development length of the flow increases substantially as the wall permittivity becomes significant, meaning that the electric double-layers require a longer distance to develop within the contraction. Consequently, there is a corresponding decrease in the hydrodynamic and electro-potential resistance caused by the contraction. The effect of wall-region width on the flow characteristics is also quantified, demonstrating that the development length increases with increasing wall-region width for widths up to 5 channel widths.     

Sense through the wall system development and design considerations

This paper presents system design challenges and issues with sensing through walls at different standoff distances and wall types. Efforts for developing sense through the wall (STTW) systems, such as those undertaken by the US Army Technology Objective (ATO) program, aim at providing the soldier with situational awareness information before breaching a building in a military operations in urban terrain (MOUT) environment. STTW capabilities also support law enforcement and search and rescue applications. Since 2002, extensive evaluations of STTW technologies, most notably those performed by the Communications Electronics, Research, Development and Engineering Center (CERDEC) Intelligence and Information Warfare Directorate (I2WD), have been made to determine which technology could be the most viable solution. After conducting comprehensive studies, I2WD initiated several Phase I efforts and Phase II efforts. The purpose behind both efforts was to develop various STTW technology demonstrators under a 5 year ATO. Many lessons learned during the development of Phase I systems were incorporated into the considerations for Phase II developments. This paper discusses design challenges and issues with sensing through walls at different standoff distances and wall types through lessons learned and results from modeling and simulations performed by the Army Research Laboratory.     

可扩展大屏幕高分辨率并行显示系统的构建及其在地学中的应用

可扩展大屏幕高分辨率并行显示系统的构建,包括硬件环境、软件环境与软件技术、图形校正与颜色校正.基于SAGE和VizRoll大屏幕显示技术,利用PC-cluster及LCD构建了一个可扩展4×5高分辨率并行显示阵列,并实现了高分辨率并行显示系统在地学可视化中的几个典型应用.     

Measurement of expansin activity and plant cell wall creep by using a commercial texture analyzer

BackgroundExpansins play an important role in cell wall metabolism and fruit softening. Determination of expansin activity is a challenging problem since it depends on measuring cell wall properties by using ad hoc extensometers, a fact that has strongly restricted its study. Then, the objective of the work was to adapt a methodology to measure cell wall creep and expansin activity using a commercial texture meter, equipped with miniature tensile grips and an ad hoc cuvette of easy construction.ResultsIt was possible to measure hypocotyls acid growth and expansin activity in a reliable and reproducible way, using a commercial texture meter, common equipment found in laboratories of food science or postharvest technology. Expansin activity was detected in protein extracts from cucumber hypocotyls, tomato and strawberry fruits, and statistical differences in expansin activity were found in both fruit models at different ripening stages.ConclusionsThe possibility of measuring expansin activity following this adapted protocol with a commercial texture meter could contribute to ease and increase the analysis of expansin in different systems, leading to a better understanding of the properties of these proteins under different experimental conditions.     

高层建筑地下连续墙施工技术

地下连续墙作为邻近建筑物基础的支护以及直接成为承受直接荷载的基础结构的一部分,在基坑开挖时可以起到挡土和截水抗渗等作用.文章结合工程的实际情况,主要介绍了地下连续墙的施工工艺及施工质量控制措施等.     

Use of a virtual wall valve in polydimethylsiloxane microfluidic devices for bioanalytical applications

A simple method for micromanipulation of liquids and∕or small groups of cells is presented in this study. Microfabricated sieving structures composed of PDMS (polydimethylsiloxane) were used to segregate aqueous solutions. This microfluidic valving scheme was an application of Cassie-Baxter wetting and was termed "virtual walls" as a nonsolid barrier exists at an air∕water interface. The manipulation of the virtual-air-wall valve was accomplished by controlling the strength of surface-tension and hydrostatic-pressure forces. Virtual walls with a range of feature sizes were designed and characterized by monitoring air and water displacement in response to hydrostatic pressure. Thresholds for the virtual-air-wall valves to be turned on or off were quantified. The walls could also be formed or dissipated by the focused microbeam of a pulsed laser. As an illustration of the virtual wall utility, a series of microfluidic applications were demonstrated. First, the capability of virtual walls to temporarily segregate liquids was integrated into a device utilized to establish a chemical gradient. In a second application, the arraying of nonadherent cells within individual aqueous cavities created by the virtual walls was demonstrated. Individual cells were also released from the cavities on demand using a focused microbeam. The virtual walls were simple and easy-to-fabricate without the requirement for surface treatment or precision alignment, and should find usage in bioanalytical applications.     

机械成井、管外换料工艺在大口井成井中的应用

本文提出了通过机械成井、管外换料的成井工艺,以增大大口井涌水量,延长大口井使用寿命。通过在某些水源地大口井取水中的实践,证明效果良好。     

地下连续墙施工技术

文章结合工程的实际,介绍了基坑支护采用地下连续墙的形式,为了节约成本,地下连续墙也作为日后的结构承重墙,即两墙合一的施工技术。地下连续墙作为结构的一部分,主要起承重、挡土和截水抗渗等作用。     

地下室混凝土墙裂缝分析与防治

本文根据工程实际情况,对混凝土裂缝的特征和主要原因进行了较全面的分析,针对地下室外墙易产生裂缝提出了预防措施和补救措施:加强优化设计,增强混凝土的抗裂能力,减少约束;组织合理施工和养护,减少混凝土温差和收缩,发现裂缝后,根据裂缝特征进行有效修补,从而克服混凝土开裂的质量通病。     

Disrupting the wall accumulation of human sperm cells by artificial corrugation

Many self-propelled microorganisms are attracted to surfaces. This makes their dynamics in restricted geometries very different from that observed in the bulk. Swimming along walls is beneficial for directing and sorting cells, but may be detrimental if homogeneous populations are desired, such as in counting microchambers. In this work, we characterize the motion of human sperm cells ∼60 μm long, strongly confined to ∼25 μm shallow chambers. We investigate the nature of the cell trajectories between the confining surfaces and their accumulation near the borders. Observed cell trajectories are composed of a succession of quasi-circular and quasi-linear segments. This suggests that the cells follow a path of intermittent trappings near the top and bottom surfaces separated by stretches of quasi-free motion in between the two surfaces, as confirmed by depth resolved confocal microscopy studies. We show that the introduction of artificial petal-shaped corrugation in the lateral boundaries removes the tendency of cells to accumulate near the borders, an effect which we hypothesize may be valuable for microfluidic applications in biomedicine.