UHMWPE混炼接枝马来酸酐研究

讨论了超高相对分子质量聚乙烯(UHMWPE)混炼接枝马来酸酐(MAH)过程中，单体MAH用量、引发剂DCP用量、交联抑制剂己内酰胺(CAILA)用量、流动改性剂硬脂酸钙(CaSt2)用量及混炼温度、时间等工艺条件对UHMWPE接枝率和凝胶含量的影响。用红外光谱表征了接枝物的存在。并用滴定分析法和重量分析法测定了接枝物UHMWPE～g～MAH的接枝率和凝胶含量。实验表明，MAH用量为5份、DCP为0．15份、CALA为0．1份、CaSt2为1份时。混炼温度175∽180℃。混炼时间14min时，可得到接枝率0．75％、凝胶含量1．48%的UHMWPE接枝物。     

可控特征点对以及RANSAC的监视系统外参估算方法

为了提高基于机器视觉的监控系统的精度,立体视觉信息作为一种鲁棒性很高的参数被引入监控算法中.立体视觉信息的引入使得外参求解成为影响监控结果的一个重要环节.现存的应用于监视系统的外参自动估算方法均采用立体视觉中外参求解的方法.这些方法普遍存在特征点的数目完全由场景决定特点.为了解决在大部分监视系统应用的场景中,因为背景较为空旷、基线较长同时相机对之间的旋转量较大,由场景提供的特征点数量非常有限,导致计算结果并不理想这一问题,提出了一种基于视频序列的RANSAC外参求解方法.该方法不仅利用RANSAC算法有效的剔除外点,而且根据可控特征点对的动态性,利用时间上的积累获得了充足的位置可控、数量可控的可控特征点对,并据此得到精度较高的外参结果.根据实验,该方法可以将三维重建误差降低近50%.     

Study on early warning index of spatial deformation for high concrete dam

Owing to the deficiency in early warning for high concrete dam,a formula was established to characterize the deformation behavior of high concrete dam as a whole.The early warning index of spatial deformation was calculated by low probability principle on the basis of the deformation entropy formula proposed.The steps were as follows.Firstly,the probability method was utilized to define the degree of order and degree of chaos for each survey point.Secondly,the weight distribution among the survey points was...     

三大原则激活数据红利

如今,各国政府都在寻找可以通过少量投入实现强大新功能的科技。只要有追求创新的精神和持之以恒的努力,大多数城市都可以实现可持续发展的智能技术解决方案,从而降低成本,提高市政服务水平,改善市民的生活质量。微软委托IDC进行的一项最新研究指出,通过整合零散数据,采用新型数据分析工具,并向更多人传递有用的洞察,全球各国的政府机构在未来四年内从数据挖掘中获得的数据红利将高达2060亿美元,并且越早采用,收益越大。     

如何有效控制存储成本

导读 目前,控制合规成本仍是企业的工作重点之一。其中的难点在于如何在恰当的时间将正确的“内容”保存在适宜的地方。依据传统的做法,企业在对数据归档时只是一味地对数据无限制的存储,无法经济高效地从长远解决数据保留问题。     

Characterization and modeling of diffusion process for mass transport through the Tournemire argillites (Aveyron, France)

Argillites are one of the geological formations studied by IRSN for their confining properties for isolation of radioactive wastes. One of the main objectives is the study of water transport through rocks with very low water content and very low hydraulic conductivity by modeling of natural tracer profiles. This paper presents the protocol developed for and applied to the acquisition of data for chloride content in interstitial water of the Toarcian argillites at the Tournemire site (Southern France). This protocol is based on laboratory diffusion experiments and on modeling. Experimental data obtained during the transient and steady-state parts of diffusion experiments enable, respectively, the assessment of the diffusion coefficient and the determination of Cl concentration in pore water. Using this protocol, profiles with depth for both of these data sets have been acquired along the geological sequence. Taking into account the present knowledge of the geological and hydrogeological history of the Tournemire massif, a conceptual model granting the main role for mass transport to diffusion has been proposed. According to this conceptual model, a one-dimensional numerical model was built for simulating the mass transport of chloride through the sedimentary column, over 53 Ma. The good agreement between experimental data and calculated values for both diffusion coefficients and concentrations of chloride confirms that diffusion is likely the main process for mass transport in the massif. This model was also tested with the deuterium content of interstitial water, applying variable concentrations at the aquifer system boundaries for reflecting the thermal dependency of isotopic composition in precipitation. These simulations also reveal the likely important role of heterogeneities, such as fractures, in the variability of tracer concentrations with regards to a simple diffusion profile.     

枪黑色氮钛膜层性能研究

详细介绍枪黑色氮钛膜层的耐磨损及耐腐蚀性能,并和传统的氧化黑色膜层和磷化黑色膜层作了比较,枪黑色氮钛膜层的耐磨损及耐腐蚀性能均高于氧化黑色膜层和磷化黑色膜层3倍以上,是一种比较先进和理想的新型膜层,为离子镀技术开辟了新的应用途径。     

巧用CL-02DS中文设定显示单元

本文介绍了利用CL－02DS中文设定显示单元，配合程序设计，使之实现记录功能。     

防锈油膜在5% Na2SO4溶液中的半导体导电行为

采用电位—电容法及Mott-Schottky分析技术研究了自腐蚀电位条件下防锈油膜在5% Na2SO4溶液中失效过程的导电机制转变行为.防锈油膜在5% Na2SO4溶液中的失效过程存在半导体导电特征，随着浸泡时间的延长，防锈油膜从浸泡初期的p型半导体转变为n型半导体，转变过程中，防锈油膜中出现两个空间电荷过渡层.随着浸泡时间的延长，防锈油膜中的空间电荷层厚度皆逐渐减小，载流子密度则逐渐增加，并且计算了不同转变时期防锈油膜中的电子给体（ND）和电子受体（NA）密度大小.     

EXPERIMENTAL STUDY ON SEDIMENT RESUSPENSION IN TAIHU LAKE UNDER DIFFERENT HYDRODYNAMIC DISTURBANCES

Contaminants resuspension in sediments induced by wind-wave could influence the water quality in shallow lakes. Resuspension of surface sediments from the Zhushan Bay, Taihu Lake was simulated under different wind forcing by using a pneumatic annular flume in this study. Acoustic Doppler Velocimeter (ADV) was used to measure flow velocity at each wind speed, and the characteristics of sediment resuspension were studied with the layered sampling technology. The experimental results show that the flow velocity increases with wind speed obviously and 6m/s is a critical wind speed which affected hydrodynamic conditions significantly. The distribution of flow velocity and water depth is different from that in ordinary open channel. With the enhanced hydrodynamic factors, the Suspended Solids Concentration (SSC) in water increases accordingly, and the incipient velocity of sediment resuspension is about 0.21 m/s. Based on the analysis of wind speed and average SSC in water column, the quantitative relationship is obtained. The SSC of the bottom layer is higher than the content of surface layer under different hydrodynamic conditions, and there are similar distributions between SSC and flow velocity in different water layers.