稻壳糟蛋白饲料的研究

本文报道利用热带假丝酵母(Candida tropicalis 2.637)以固体糟为底物,在发酵料中加入锌终浓度15ppm、钼20ppm,稀土元素0.1％,尿素2％时,30℃培养48小时后,粗蛋白含量由本底20.93％提高到36.21％。     

纤维和引气剂对现代水泥基材料抗渗性的影响

研究了聚乙烯醇纤维(PVAF)、聚丙烯纤维(PPF)、玄武岩纤维(BF)和不同掺量引气剂对现代水泥基材料抗渗性的影响.通过抗渗试验和压汞试验(MIP)对水泥基材料的抗渗性和孔结构进行测试,分析了纤维和不同掺量引气剂掺入后水泥基材料孔结构的改变,孔结构的改变影响了水泥基材料的抗渗性.实验结果表明:掺入PVAF可以提高水泥基材料的抗渗性,而PPF和BF对水泥基材料的抗渗能力有负面效应;掺入适量引气剂后因孔结构的改善也会显著提高水泥基复合材料的抗渗能力.     

软件过程领域本体的构造

针对目前软件过程领域知识缺乏明确统一的表示、不同组织构造的过程模型缺少互操作性而难以共享和重用的情况,划分并描述了软件过程的顶层本体;在此基础上,对其中包含的任务描述、过程模型和过程实施与改进三个核心本体分别进行了展开和细化,给出了涉及到的关键概念的形式化定义.传统的本体系统并不适宜描述动态过程,因此使用谓词逻辑定义了过程本体中概念间的基本关系,以此来表示和描述软件过程模型的“柔性”和动态知识,使不同的参与者易于交流而达成共识,为构造可共享、易重用的过程模型元模型提供坚实、统一的基础.     

Product Family Hierarchical Associated Design and Its Hierarchical Optimization

After reviewing the literature and methodology-related issues within the field of product family design, a deficiency in the current design and development of product family is pointed out. The concept of hierarchical associated design is proposed in this article, according to the deficiency~ and the methods and models for realizing the notion above are described. A two-dimensional analytical model is constructed based on the composing levels and developing processes of product family. The optimization models to hierarchical associated design problems are grouped into two categories： overall-local and key-subordinate. The algorithms of the models are discussed in this paper     

Error reduction, convergence and optimality of an adaptive mixed finite element method

This paper proves the error reduction property(saturation property),convergence and optimality of an adaptive mixed finite element method(AMFEM) for the Poisson equation.In each step of AMFEM,the local refinement is performed basing on simple either edge-oriented residuals or edge-oriented data oscillations,depending only on the marking strategy,under some restriction of refinement.The main tools used here are the strict discrete local efficiency property given by Carstensen and Hoppe(2006) and the quasi-orthogonality estimate proved by Chen,Hoist,and Xu (2009).Numerical experiments fully confirm the theoretical analysis.     

Charging Station Planning for Plug-In Electric Vehicles

A novel model for the charging station planning problem of plug-in electric vehicles is proposed in this paper considering the users’ daily travel. With the objective of minimizing the total cost, including the charging stations’ cost (including installing cost and management cost) and the users’ cost (including station access cost and charging cost), the proposed model simultaneously handles the problems where to locate the charging stations and how many chargers to be established in each charging station. Considering that different users may have different perception of station access cost and charging cost, two cases (i.e., homogeneous users and heterogeneous users) are typically investigated. The impacts of different discount rates, operating period of the charging stations, number of electric vehicles and number of charging stations on the location of the charging station are also studied. The simulation results not only show that it is very important to locate the charging stations according to the traveling behavior of users, but also verify the validity of the proposed model.     

带有非线性测量方程的跟踪系统的仿真研究

探讨了具有非线性测量方程的跟踪系统的计算机仿真方法。给出了一类常见的跟踪系统的数学模型和仿真模型。并以一个实例说明了该仿真方法的可行性。     

Multi-axial three-dimensional printing of conical bioresorbable vascular scaffold

Coronary artery disease (CAD) is the leading cause of death worldwide.Implantation of traditional cylindrical stents into the stenotic coronary arteries is wide...     

新一代重力卫星时变重力场滤波方法分析

新一代重力卫星的成功发射使连续监测全球陆地水储量变化成为现实.为了削弱高频误差和条带误差的影响,采用Level-2 RL06版本的时变重力场数据反演全球陆地水储量变化,并讨论了高斯滤波和Fan滤波的处理效果,并且利用水文模型数据进行验证.结果表明:采用滤波半径为250 km的Fan滤波和P3M8去相关滤波的组合算法既能...     

超声导波在管道缺陷成像中的发展与挑战

回顾了超声导波在管道缺陷检测中的发展历程,阐述了管道导波的传播模态,调研了管道缺陷成像技术的研究现状.对超声导波在管道缺陷成像的应用展开了评述,介绍了相控阵成像法、时间反转法、层析成像法、偏移成像法、延迟叠加法,并比较了各种方法的特点与适用范围.最后总结了当前超声导波在管道缺陷成像中面临的机遇与挑战.