Nearly Sasak流形的半不变子流形的测地性

给出了Nearly Sasak流形的半不变子流形测地的几个充要条件．     

接近亏损系统的多输入模态控制器的递推设计方法

提出了一种接近亏损的多输入系统反馈控制器设计的递推方法。该方法首先将具有密集特征值的接近亏损系统转化为亏损系统,然后应用处理亏损系统的方法对接近亏损系统进行控制。该方法建立在模态方程的基础上,避免了繁杂的数学过程。最后通过数值算例验证了该方法的有效性。     

被动非接触静电探测在复合引信中的应用

通过对被动非接触式静电探测方法的研究,根据其具有的独特优点,提出了其在实现防空武器弹丸引信近炸功能方面的应用。经过理论分析和模拟实验得出被动非接触式静电探测方法在复合引信实现近炸功能方面应用的可行性。实验结果表明:该探测技术的应用能使弹丸在最佳炸点爆炸,实现弹丸的最大杀伤力,有效提升防空武器对目标的毁歼概率。     

三江北西段楚多曲矿床近东西向控矿断裂构造的识别及找矿意义

三江北西段是西南三江成矿带的北段西延部分,已发现的矿床(点)明显受近东西向区域性断裂构造带及沿构造带分布的中酸性侵入岩体控制,成矿环境为典型的岩浆-构造活动环境。本文通过对楚多曲矿床在矿体特征、矿石特征、土壤地球化学特征对比基础上,新识别并确认了研究区近东西向断裂的控矿事实,改变了勘查工作只针对近南北向控矿断裂的现状;另外新发现了沿近南北向断裂与近东西向断裂复合部位侵入的二长斑岩体,针对其斑岩型矿化蚀变特征,初步探讨了斑岩型成矿可能;指出了研究区及区域下一步找矿方向。     

大直径分离式霍普金森压杆试验中的波形整形技术研究

采用直径100 mm分离式霍普金森压杆(SHPB)试验装置,以碳纤维混凝土(CFRC)的SHPB试验为例,就试验过程中的波形整形技术展开研究,内容包括：波形整形器的设计、近似恒应变率的估算、最佳近似恒应变率的确定以及应力均匀性分析。结果表明：厚度为1 mm,直径分别为20 mm、22 mm、25 mm、27 mm、30 mm的H62黄铜波形整形器对入射波形有明显的改善效果,可将入射脉冲上升沿的升时延长1～1.6倍;应变率对于波形整形器的直径很敏感,随着整形器直径的增大,最佳近似恒应变率也在增加,一个几何尺寸的波形整形器只能对应于一个最佳近似恒应变率．且与整形器的直径之间满足线性函数关系;应力不均匀系数能够有效地描述混凝土材料SHPB试验的应力均匀性。     

沟谷地形下近浅埋煤层工作面矿压显现规律研究

为掌握沟谷地形下近浅埋煤层工作面矿压显现规律,以王家岭煤矿20105工作面地质条件及生产实践为基础,采用顶板动态监测系统,分别对不同坡体下工作面液压支架工作阻力特性进行观测,分析了沟谷垂深、坡体角度、冲沟切割系数对工作面矿压显现的影响。研究表明,沿工作面倾向不同区域的来压步距、持续时间及来压强度均不同,工作面中部的初次及周期来压强度均大于工作面两端的来压强度;相较于沟谷垂深及坡体角度,冲沟切割系数是影响工作面矿压显现的主要因素,冲沟切割系数大于0.4时,支架阻力增量超过8%,冲沟切割系数小于0.17时,支架阻力增量变化不明显。近浅埋煤层的基岩厚度较大,且存在双关键层结构,沟谷地形对其支架阻力的影响程度相对较低。     

A VDQ-based multifield approach to the 2D compressible nonlinear elasticity

A numerical multifield methodology is developed to address the large deformation problems of hyperelastic solids based on the 2D nonlinear elasticity in the compressible and nearly incompressible regimes. The governing equations are derived using the Hu-Washizu principle, considering displacement, displacement gradient, and the first Piola-Kirchhoff stress tensor as independent unknowns. In the formulation, the tensor form of equations is replaced by a novel matrix-vector format for computational purposes. In the solution strategy, based on the variational differential quadrature (VDQ) technique and a transformation procedure, a new numerical approach is proposed by which the discretized governing equations are directly obtained through introducing derivative and integral matrix operators. The present method can be regarded as a viable alternative to mixed finite element methods because it is locking free and does not involve complexities related to considering several DOFs for each element in the finite element exterior calculus. Simple implementation is another advantage of this VDQ-based approach. Some well-known examples are solved to demonstrate the reliability and effectiveness of the approach. The results reveal that it has good performance in the large deformation problems of hyperelastic solids in compressible and nearly incompressible regimes.     

非线性变质量系统双质体自同步长距离水平振动输送机的研制

在原普通水平振动输送机的基础上 ,经过市场与现场调研 ,应用非线性振动理论、微弯等截面梁的弯曲振动理论、最优化理论、近共振理论及 CAD技术 ,研制出振动机械新产品 ,该产品与国内外同类产品相比具有重量轻、体积小、节能、低噪、高效的特点 ,是一个极具发展前景推广与应用价值的高新技术产品     

Growth Kinetics of Single Inclusion Particle in Molten Melts

On the basis of the single-particle framework, a new theory on inclusion growth in metallurgical melts is developed to study the kinetics of inclusion growth on account of reaction and collision. The studies show that the early growth of inclusion depends on reaction growth and Brawnian motion collision, and where the former is decisive, the late growth depends on turbulence collision and Stokes＇ collision, and where the former is dominant; collision growth is very quick during the smelting process, lessened in the refining process, but nearly negligible in the continuous casting process.     

Theoretical Analysis for the Motion and Temperature of Melt Droplets in Spray Degassing Process

The motion of melt droplets in spray degassing process was analyzed theoretically. The height of the treatment tank in spray degassing process could be determined by the results of theoretical calculation of motion of melt droplets. To know whether the melt droplets would solidify during spraying process, the balance temperature of melt droplets was also theoretically analyzed. Then proof experiments for theoretical results about temperature of melt droplets were carried. In comparison, the experimental results were nearly similar to the calculation results.