一种缓冲区溢出防御虚拟机的研究与实现

指出保护地址信息和状态信息的完整性是防御的重点,从为用户程序搭建运行时系统环境,以指令最终进入处理机执行为主线,运用虚拟机技术动态检测、控制关键指令和部分系统调用,给出一种基于进程虚拟机动态防御缓冲区溢出的防御方案.     

电沉积Fe-Ni-Cr镀层的腐蚀性能研究

着重研究了pH值对Fe-Ni-Cr电镀层的电化学腐蚀性能影响以及镀层对碳钢的防护性能.结果表明,在镀液PH=3.25时获得的电沉积镀层虽然没有显示钝化性能,但对碳钢的电化学腐蚀性能仍然具有一定的改善作用.PH=2.38的镀层,具有很好的钝化性能,从而显示了很好的耐蚀性能,对碳钢有很好的保护作用.另外,从电镀的过程中也可以得出一个结论,就是在较低的pH值下比较容易施镀且镀层的性能较好.     

针对DSP运动控制器的CAN总线软硬件设计

介绍了CAN总线的优良性能,给出了针对DSP运动控制器的CAN总线系统结构框图。主要完成了对TMS320LF2407A运动控制器上CAN总线硬件接口电路的设计和软件的实现。实现了对TMS320LF2407A的CAN总线通信软件的模块化设计,并用实验验证其正确性。在此基础上,CAN总线通信的实现只需要修改相应的几个寄存器即可,大大降低了软件设计的周期,也为DSP的CAN总线硬件电路的设计提供了参考。     

基于Web的企业知识管理信息系统的构建问题研究

基于Web技术，构建了企业知识管理信息系统，对知识管理信息系统技术平台的选择及框架模型的设计进行了阐述，该系统提高了知识的共享、利用程度，促进了知识的更新与进化，实现了知识资源企业化，保证了企业知识资源的完整性．     

节能多孔砖墙体热工性能的数值计算及应用分析

介绍了节能多孔砖墙体传热过程数值计算的基本原理与具体方法,给出了多个节能多孔砖墙体计算实例,并与实验结果进行对比.同时,计算了周期性非稳态边界下墙体的传热量、墙体温度和墙体的谐波性能参数.     

振子驱动型牵引传动研究

在常规牵引传动和往复牵引传动的基础提出了一种依赖反复微小振动进行动力传动的振子型牵引传动。先通过振子振动形成油膜实验得出在接触区施以微小振动更易形成油膜的结论,又通过圆周运动型牵引传动实验得出了其相对于摩擦传动磨损小的优点。利用微小振动形成润滑油膜的方法引起的磨损小,可广泛应用于光学聚焦等精密运动领域。     

《无机及分析化学》教学体会

无机及分析化学是一门专业基础课程,它对后续课程的学习起着关键的作用。本文阐述了在教学实践中为提高教学效果所采取的一系列措施,主要内容包括激发学习兴趣、合理利用多媒体、建立科学考评制度、建立良好师生情谊等。多年来综合运用这些教学方法,取得了良好的教学效果。     

Formation of novel mesoporous TiC microspheres through a sol–gel and carbothermal reduction process

Novel mesoporous TiC microspheres with uniform size are synthesized via a sol–gel combined carbothermal reduction process. A microfluidic aerosol nozzle was used to produce droplets which were subsequently dried into gel microspheres under different conditions. The influence of drying temperatures and sol aging time on the diameters of obtained gel microspheres was investigated. The spherical morphology of TiC spheres can be maintained after a two-step heat treatment. Moreover, the TiC microspheres exhibit a high surface area of 267 m²/g and consist of 30–50 nm nano TiC grains and 4.5 nm pores. This unique nanostructure is directly formed from the carbothermal reduction of non-porous and template-free titania/carbon spheres.     

The design of cobalt-free, nickel-based alloy powder (Ni-3) used for sealing surfaces of nuclear power valves and its structure of laser cladding coating

To meet the demand of cobalt-free for the cladding coating materials used on sealing surface of nuclear power valves, a new Co-free, Ni-Cr based alloy powder (Ni-3) has been developed. It has been successfully coated on the surface of stainless steel as the strengthening layer. The XRD result reveals that the primary phase of cladding coating is Ni-based solid solution, and the carbides M₇C₃ and M₂₃C₆ as well as several A₃B types of γ′ strengthening phases. It indicates that the alloy possesses the high wear resistance, good corrosion resistance and high temperature tolerance. The test results suggest that the micro-hardness of Ni-3 corresponds to that of alloy Stellite 6 which containing cobalt and currently used as material for nuclear power valves. Hence, the developed Ni-3 alloy powder can be the hopeful candidate material for Co-free cladding material used on the surface of nuclear power valves; it can reduce the nuclear pollution and save the expensive metals.