Implicit methods for fluid dynamics

This paper represents the contributions to the development of implicit procedures for solving the equations of fluid dynamics made by Briley and McDonald (1975)[1], Beam and Warming (1976, 1978) [2] and [3] and Lombard et al. (1983) [4]. The contributions of Briley and McDonald and Beam and Warming are well known, but Lombard has not been fully recognized for his innovative contributions to flux vector splitting and use of the DDADI (Diagonally Dominate Alternating Direction Implicit) algorithm. Their contributions are presented herein.Fully implicit algorithms are applied to two complex flow problems of current interest, (1) hypersonic non-equilibrium flow about a blunt nosed body and (2) flow within an MFD (magneto-fluid dynamics) accelerator. These two applications would be exceeding costly without the use of fully implicit methods.     

面向定制化装配式建筑的制造与装配设计策略研究 ——以莲花之居为例

针对建筑师缺乏关于定制化装配式建 筑制造与装配的技术认知与研究前置等问题, 文章旨在通过面向制造与装配的设计（DfMA） 理论探索,建构适用于建筑领域的DfMA策 略。策略研究分实施基础、面向制造的设计 （DfM）和面向装配的设计（DfA）三部分,并 基于莲花之居进行实践验证以形成实施框架, 从而为建筑师提供面向定制化装配式建筑的 DfMA策略指导与设计建造流程参考。     

轧机开卷卷取直流电机工作电流分析

对直流驱动开卷卷取机工作过程进行分析,按照励磁磁通饱和,和励磁弱磁两种工况分别考虑,计算出张力转矩和动态补偿转矩与料卷卷径的关系,从而求出在一道次轧制过程中的电机最大电流     

有色金属加工企业氯气事故原因与防范措施

剖析氯气管道系统、液氯钢瓶事故原因,根据氯气的特点提出了防范措施.     

金属渗透梯度层陶瓷基片在LED散热中的应用

在LED散热领域,铝基板居很大市场份额.介绍了金属渗透梯度层陶瓷基片,这种陶瓷基片由陶瓷与金属材料相互扩散形成的,导热性、绝缘性、抗剥离强度及抗震动性好,可解决大功率LED的散热问题.这种基板已用于制作大功率LED灯,并取得了明显的社会经济效益.     

“数字图像处理”课程教学实践与探讨

数字图像处理是信息类专业重要的本科专业课程之一。在为我院本科生讲授的数字图像处理课程实践中,我们尝试融合多种教学手段,提升课程教学效果。本文结合前期教学实践,从可视化教学手段、知识关联比较、理论结合实践、双语教改和教学大纲改进等方面介绍在该课程教学方面的一些探索和体会。     

Dieless drawing steel wires using a dielectric heating method and modeling the process dynamics

Modern industries require the production of multi-functional, inorganic, micron-sized metal wires. This study suggests a novel method that could potentially offer a highly efficient dieless drawing technology for manufacturing thin stainless steel fibers. The method is based on a hot-working principle, using microwaves as the heat source and SiC as the susceptor. Experimental trials with a laboratory rig showed that the new system worked effectively for drawing the stainless steel wires and should be able to realize the diameter attenuation with a diameter reduction of up to 21%. The theoretical model describing the deformation behavior of the stainless steel wires in the working zone along with the constitutive equation of Bingham model modified with a power law and Zener–Hollomon parameter turned out to match very good with the actual results of the experiment. The coefficient of variation of the drawn wire diameter increased, as the draw ratio increased, which could be attributed to the occurrence of the narrow necking zone.     

基于快速支持向量机的图像型火灾探测算法*

图像型火灾探测的核心问题是火焰和疑似火焰物体的分类和识别。以火灾视频和疑似火灾视频为分析对象,提取了火灾图像的面积重叠率、圆形度以及火焰尖角数目三个特征量,选择快速支持向量机进行分类器训练,最终利用训练好的分类器实现了火焰及干扰物体的分类识别问题。实验结果表明,该算法提高了火灾图像的分类精度和火灾识别的准确率,同时具有较高的检测效率。     

建筑施工安全管理综合评价模型研究

将灰色关联分析方法应用于建筑施工安全管理综合评价,从人-机-环境-管理四个方面出发,建立科学、系统的建筑施工安全管理综合评价指标体系。建立灰色关联分析方法与施工现场安全综合评价指标体系,为建筑企业进行各个项目安全管理奠定了坚实的基础。     

板料增量成形的研究进展

板料增量成形是采用简单模具对板料进行逐次塑性加工的一种工艺,不需要专用的模具就可以成形较为复杂的零件,同时还具有成形力小、柔性高的特点,特别适合多品种小批量零件的生产方式,因此得到国内外学者的重视。本文重点从板料的增量压弯成形、增量拉深胀形、增量微成形3个方面对板料增量成形的发展进行综述,还对板料增量成形工艺的发展前景进行了展望,指出进行理论创新、开发新的模拟软件、探索新的成形方案、开发增量成形新设备是发展趋势。