Effect of stitching and weave architecture on the high strain rate compression response of affordable woven carbon/epoxy composites

In this study, experimental investigations on stitched and unstitched woven carbon/epoxy laminates under high strain rate compression loading are discussed. Stitched/unstitched laminates are fabricated with aerospace grade plain and satin weave fabrics with room temperature curing SC-15 epoxy resin using affordable vacuum assisted resin infusion molding process. The samples are subjected to high strain rate loading using modified compression split Hopkinson’s pressure bar at three different strain rates ranging from 320 to 1149 s⁻¹. Results are discussed in terms of unstitched/stitched configuration, fabric type and loading directions. Dynamic compression properties are compared with those of static loading. Failure mechanisms are characterized through optical and scanning microscopy.     

嵌入式系统中引导程序的实现

给出了基于ARM7嵌入式系统引导程序的实现流程，并针对嵌入式系统中目标文件的分布装载等技术难点进行详细分析。     

变频调速蝶阀

介绍了变频调速蝶阀的性能，分析了其组合结构特点，阐述了主要设计参数选取方法，论述了其应用状况。     

Determination of rock mass deformation modulus by means of traveling load tests—Part I: Theory of the traveling load test in an open pit

A new scheme named the Traveling Load Test is proposed to measure the macroscopic deformation modulus of the floor rock mass in an open pit, covering a volume of rock mass much larger than conventional loading tests. Facility of the test includes extra-large excavators as load-sources on the flat surface and high-resolution borehole tilt-meters installed in rock to detect the microscopic tilt induced by the load. Emphasis is given to the theory of deformation modulus determination, which is applicable to the field where the floor is fully covered by an accumulation of loose blocks of stone produced by blasting damage and/or stress relief. The relation between the induced tilt and the traveling load is formulated, and subsequently it is shown how the deformation modulus is determined by analyzing the induced tilt-loading distance curve, within acceptable engineering accuracy.     

整车振动试验台加载装置分析

介绍了整车振动试验台的加载装置 .对加载装置的横向干扰问题进行了分析 ,得出了补偿量的计算方法 .并对加载装置进行了运动分析 ,建立了速度和加速度的数学模型     

Solaris10操作系统在SUN V890服务器中的安装方法

钟吉太，岳淑华，杨志仁．Solaris10操作系统在SUN V890服务器中的安装方法，物探装备，2006，16（4）：298-300 SUN V890服务器具有强大的处理、解释功能，是在物探地震资料解释中起重要作用的高性能的工作站服务器。为了充分发挥SUN V890服务器的强大功效，必须为服务器安装Solaris操作系统，本文对Solaris操作系统在SUN V890服务器中的安装方法进行了详细地介绍。     

压电作动器在微力微位移装置中的应用

在微力微位移装置中采用闭环控制压电作动器实现微位移进给和微力加载，设计了加载机构，建立加载机构的压电作动器输入电压、加载装置输位移和输出力之间的关系。通过电容测位移仪检测输出位移，实验得到加载系统刚度，根据压电作动器输入电压、加载装置刚度，计算出加载力大小。该方法为微机械力学性能测试仪打下了基础。     

加注过程中液氧的温升和液氧泵的变频调速技术

分析了用泵加注液氧的温升，给出了温升计算公式并举例做了计算。指出采用调速泵加注可以消除因节流引起的能量损耗，降低液氧的温升，最后介绍了用现代变频器实现加注泵调速的技术。     

Correlation between cyclic deformation behaviour and microstructure in a duplex steel between 300 and 773 K

Cyclic tests performed in the temperature range 300–773 K on duplex stainless steel DIN 1.4460 show that the cyclic stress–strain behaviour of this steel is strongly temperature dependent. At 300 and 473 K an almost constant peak tensile stress stage, is followed by a slight softening that continues up to failure in the case of 300 K, but by a secondary hardening at 473 K. Pronounced initial cyclic hardening followed by secondary hardening was the main feature of the temperature range between 573 and 723 K. At 773 K, after a weak hardening stage, a strong softening continues up to failure. The mechanical behaviour and the evolution of the microstructure were analysed, and the internal and the effective stresses were studied. It was found that the internal stress is responsible for the strong hardening that occurs in the intermediate temperature range and for the softening at 773 K.