基于容器的Web运行环境轻量级虚拟化方法

Web运行环境、Web服务及Web应用的虚拟化是减轻Web操作系统安全风险的一种有效方法,然而Web运行环境的虚拟化仍然存在不少挑战,如：执行时间、资源负载和兼容性等。为解决Web操作系统在安全性、执行时间、资源负载和兼容性方面的问题,提出了一种Web运行环境轻量级虚拟化方法,采用Docker容器技术实现进程级别的隔离。本虚拟化方法可在一个基本内核上支持运行多种Web运行环境的容器。此外,为了减轻容器创建负载,提出了容器启动机制;为减轻系统资源负载,进行了系统的轻量化处理。在嵌入式设备的实验结果表明,该虚拟化方法在执行时间、资源负载及兼容性方面都具有较优表现。     

20＂通径中压球阀的设计和三维数值模拟

介绍了通径为20＂（1＂=25．4mm）的大口径中压球阀阀体、新型C形金属密封环组件等的结构设计；在阀座与球体之间采用整体碟形弹簧和新型阀座密封填料，以保证高压密封，提高使用寿命；阀芯采用空心球体结构和分段冲压成形加工工艺，有效地保证了球体的加工精度和质量，降低了生产成本；在结构设计中，充分考虑了球阀的密封、防火、启闭传动及制造工艺的要求；对其中结构复杂的球阀阀体和空心球形阀芯进行了强度计算和ANSYS应力、应变模拟分析计算，二者计算结果一致，并认为阀体的厚度由其大开孔处局部应力的整体补强确定。     

A study on structure and electrochemical properties of (La, Ce, Pr, Nd)2MgNi9 hydrogen storage electrode alloys

(La, Ce, Pr, Nd)₂MgNi₉ hydrogen storage alloys were prepared through induction melting followed by a long annealing treatment. The structure and electrochemical properties of annealed alloys have been investigated by orthogonal design experiments. Both the individual effects of each substituting element and their interaction in alloys were studied systemically. It has been shown that the structure of main phase in alloys belongs to PuNi₃-type with a space group R-3m. Substituting rare-earth elements have a significant effect on both the phase structure of alloys and microstructure. The anisotropic change in the crystal structure of alloys can cause the acceleration of pulverization of alloy particles and result in the deterioration of the cyclic stability of alloy electrodes. Misch metals can raise the plateau pressure of hydrogen absorption/desorption. The discharge capacity of alloy ranges from 342.97 to 380.68 mAh g⁻¹ depending on the sort and content of substituting elements. Both cerium and neodymium can obviously reduce the discharge capacity of alloy electrodes. When compared to the La₂MgNi₉ alloy electrode, mish metals can significantly improve the high rate dischargeability of alloy electrodes. The improvement of the kinetic characteristic of alloy electrodes mainly results from the increase of the hydrogen diffusion rate in alloy bulk.     

纳米催化剂在生物柴油合成中的应用

生物柴油作为一种可再生的绿色能源,是化石燃料理想的替代品.该文聚焦于纳米催化剂在生物柴油合成中的应用,对常见的纳米催化剂的设计、制备、物化性质、催化行为及重复使用性等方面进行了综述.提出了纳米催化剂在生物柴油合成中所面临的问题并展望其应用前景.     

底吹钢包两相区两段模型

在考虑雷诺应力的基础上，建立了底吹钢包中气液两相区流体流动的两段模型。这一模型可用于计算近喷嘴处和浮羽流区各截面处两相流的平均速度、速度分布、流股直径和平均含气率等．数值计算表明：理论含气率与实验值符合很好．计算还表明：平均含气率和平均速度随高度的增大而减小，但流股直径随高度的增大而增大．另一方面，平均速度随初始供气量的增大而增大，而抽引比则随供气量增大而减小．通过两段模型可很好地描述喷嘴处气液流的行为．     

压力容器用封头制造质量控制和专业化生产发展方向

中国法规首次对压力容器等特种设备用封头实施制造资格许可和强制的监督检验制度。本文根据法规标准的规定,对压力容器封头制造质量控制和专业化生产发展方向的要求作一系统的综述,以提高压力容器产品的整体质量,确保特种设备安全万无一失。     

吸附干燥器的改进与优化设计

针对原吸附干燥器存在结构较为复杂、材质浪费过大、内部盘管焊接接头容易泄漏、设备使用寿命短、使用效果较差等问题．通过将其中的气体分布改为筛孔板结构、夹套与内筒之间巧妙增加加强圈等方面的改进设计，新的吸附干燥器结构简单，投资省．运行平稳、安全、可靠、高效，完全达到并满足生产和工艺要求。     

A non-parametric method to determine basic probability assignment for classification problems

As an important tool for knowledge representation and decision-making under uncertainty, Dempster-Shafer evidence theory (D-S theory) has been used in many fields. The application of D-S theory is critically dependent on the availability of the basic probability assignment (BPA). The determination of BPA is still an open issue. A non-parametric method to obtain BPA is proposed in this paper. This method can handle multi-attribute datasets in classification problems. Each attribute value of the dataset sample is treated as a stochastic quantity. Its non-parametric probability density function (PDF) is calculated using the training data, which can be regarded as the probability model for the corresponding attribute. The BPA function is then constructed based on the relationship between the test sample and the probability models. The missing attribute values in datasets are treated as ignorance in the framework of the evidence theory. This method does not have the assumption of any particular distribution. As a result, it can be flexibly used in many engineering applications. The obtained BPA can avoid high conflict between evidence, which is desired in data fusion. Several benchmark classification problems are used to demonstrate the proposed method and to compare against existing methods. The constructed classifier based on the proposed method compares well to the state-of-the-art algorithms.     

Video background modeling: recent approaches,issues and our proposed techniques

Effective and efficient background subtraction is important to a number of computer vision tasks. We introduce several new techniques to address key challenges for background modeling using a Gaussian mixture model (GMM) for moving objects detection in a video acquired by a static camera. The novel features of our proposed model are that it automatically learns dynamics of a scene and adapts its parameters accordingly, suppresses ghosts in the foreground mask using a SURF features matching algorithm, and introduces a new spatio-temporal filter to further refine the foreground detection results. Detection of abrupt illumination changes in the scene is dealt with by a model shifting-based scheme to reuse already learned models and spatio-temporal history of foreground blobs is used to detect and handle paused objects. The proposed model is rigorously tested and compared with several previous models and has shown significant performance improvements.     

顺酐化SBS的钠离聚体形式与丙烯酰胺的乳液接枝共聚

研究了顺酐化SBS的钠离聚体与丙烯酸胺以过氧化苯甲酰为引发剂的乳液聚合,得到了共聚的较佳条件.并以IR及DSC表征了试样的组成和多相结构.