复合材料板壳在过屈曲下最佳铺层设计的工程方法

 本文基于相同边界条件下铺层构成对失稳后的变形形态影响不大的基本假设,根据理论和实践经验得到的准最佳铺层失稳后的位移场为基础,给出了确定最佳铺层参数的工程方法。计算表明,其基本假设和解题思路是正确的。由于本方法最后归结为解一个一元三次方程,使计算大为简化,可降低设计成本和周期,在工程设计中具有实际意义。     

有序递推滤波修正系统误差方法

本文将推广卡尔曼滤波的原理拓展到对测量元素逐个进行滤波的处理。从理论上证明它可以提高状态向量滤波结果的估值精度，而且它可以减少求逆公式的计算量。本文应用该方法导出了轨道测量数据处理的有序递推自校准系统误差的方法及公式。     

喷管流场数值仿真CFD／Nozzle软件包设计

ＣＦＤ／Ｎｏｚｚｌｅ软件包是一套专门的二维轴对称跨音速喷管流场计算机辅助设计分析工具。它采用高度集成化的操作环境，将网格生成、数值计算、图形显示全部过程集于一体。具有西文环境下的全中文用户界面，操作环境同时提供详尽的彩色图文方式下的中文提示。数值方法稳健，兼具源程序开放与编译连接自动化特点。叙述了ＣＦＤ／Ｎｏｚｚｌｅ软件包设计思想和实现方式，并给出了流场计算、参数分析、功能扩充几方面的应用实例。     

隐身技术在进气道设计中的研究

根据隐身飞机的设计特点 ,对各种改善进气道隐身性能的技术措施进行了概述。通过对理论计算和试验研究结果的分析 ,给出了能有效降低进气道RCS的有实际意义的方案     

Evolution of the Protosolar Nebula and Formation of the Giant Planets

The formation of planetary systems is intimately tied to the question of the evolution of the gas and solid material in the early nebula. Current models of evolution of circumstellar disks are reviewed here with emphasis on the so-called “alpha models” in which angular momentum is transported outward by turbulent viscosity, parameterized by an dimensionless parameter α. A simple 1D model of protoplanetary disks that includes gas and embedded particles is used to introduce key questions on planetesimal formation. This model includes the aerodynamic properties of solid ice and rock grains to calculate their migration and growth. We show that the evolution of the nebula and migration and growth of its solids proceed on timescales that are generally not much longer than the timescale necessary to fully form the star-disk system from the molecular cloud. Contrary to a widely used approach, planet formation therefore can neither be studied in a static nebula nor in a nebula evolving from an arbitrary initial condition. We propose a simple approach to both account for sedimentation from the molecular cloud onto the disk, disk evolution and migration of solids. Giant planets have key roles in the history of the forming Solar System: they formed relatively early, when a significant amount of hydrogen and helium were still present in the nebula, and have a mass that is a sizable fraction of the disk mass at any given time. Their composition is also of interest because when compared to the solar composition, their enrichment in elements other than hydrogen and helium is a witness of sorting processes that occured in the protosolar nebula. We review likely scenarios capable of explaining both the presence of central dense cores in Jupiter, Saturn, Uranus and Neptune and their global composition. This revised version was published online in August 2006 with corrections to the Cover Date.     

高性能涡轮发动机润滑系统设计

简述了润滑剂对发动机设计的影响。阐明了使用酯类润滑油的设计问题及润滑系统通用的设计要求。     

大尺寸复杂筒状铝合金精铸件浇注系统设计方法研究

研究大尺寸复杂筒状铝合金精铸件浇注系统的设计方法,通过对三种具有筒状结构的大尺寸复杂铝合金精密铸件的浇铸系统设计和浇注试验,研制出冶金质量和力学性能合格的铸件.结果表明,缝隙式浇注系统或缝隙式与底注式相结合的浇注系统是该类铸件比较理想的浇铸系统设计方式.     

d—电子理论在单晶高温合金发展中的应用

对ｄ－电子理论在单晶高温合金发展中的应用进行了阐述。介绍了ｄ－电子理论和用此理论设计单晶高温合金的方法和过程。采用此理论对现有单晶合金进行了分析和讨论。     

应对学生能力差异不同策略的利弊分析

为解决高职高专院校英语课学生能力差异问题，在分析国内外教学中应对学生能力差异主要策略利弊的基础上，提出了混合班制是能够适应高职高专院校英语课学生能力差异的有效策略。     

高职教育技能竞赛与课程群建设互动机制研究

高职教育技能竞赛和课程群建设间普遍存在着相互独立运行、沟通渠道不畅、缺乏促进机制等问题.针对上述问题,提出了在技能竞赛与课程群建设间建立良性互动机制的构想,设计了互动机制的循环反馈调节模型,分析了互动要素的驱动关系,给出了互动机制在课程群建设中的实现思路和操作方法.