开炼机混炼工艺单片机指导控制仪的研制

介绍了以8031单片机为主体研制的开炼机混炼工艺指导控制仪。控制仪采用大屏幕汉字显示,在混炼过程中按加入配合剂的顺序,依次显示胶料名称、配合剂名称及加入各种配合剂后进行混炼的各种工艺参数,以达到保证混炼胶的质量、节约能源、对混炼工艺进行指导控制的目的。     

腹腔镜与开腹手术治疗低位直肠癌的临床疗效对比

目的探讨腹腔镜治疗中低位直肠癌的临床疗效与安全可行性。方法回顾性分析我院收治的46例低位直肠癌患者,治疗组23例,采用腹腔镜下直肠癌根治,对照组23例,采用开腹手术治疗,进行比较。结果 2组手术时间差异无统计学意义(P>0.05)。出血量、住院时间、肠道功能恢复均少于对照组,有明显的统计学差异(P<0.05)。2组在术中均无并发症发生。结论腹腔镜治疗低位直肠癌手术是值得推广的术式。     

Optimization of transport passage with dragline system in thick overburden open pit mine

According to the characteristics of opencast coal resources and dragline technology system application in China, the structure and shifting step of transport passage are optimized in this paper. Typical coal transport passage is analyzed in aspects such as the internal dump occupation, dragline operation efficiency, coal transport distance, upper stripping distance and shifting quantities. The middle passage should be given priority in thick overburden open pit mine because the dragline system is only responsible for part stripping task. According to characteristics of middle passage, the transport passage is divided into parallel climbing, vertical climbing and horizontal transport. In addition, the transport passage structure optimization model and shifting distance optimization model are established in this paper. The case study in Heidaigou open pit mine shows that, the parallel climbing height is accounted for about 60% of the total height, and reasonable shifting distances of the first mining area and the second mining area are 240 and 320 m. Sensitivity analysis shows that, the total passage height has important influence on the shifting step, so it is with the stripping height and passage construction cost to the passage structure.     

Preparation of separated and open end TiO2 nanotubes

Separated and open end TiO₂ nanotubes with large surface area and through-hole structure exhibit exciting functionalities in energy and environmental applications. In this study, TiO₂ nanotube membranes are created using high purity titanium sheets as raw materials by anodic oxidation at 100 V for 12 h in ethylene glycol+0.25 wt% NH₄F+5 vol% H₂O. The pore size of the nanotubes is 215 nm with uniform diameters. Close-packed TiO₂ nanotube arrays are separated by immersion in a 0.15 wt% HF water solution. With further dissolution by 40% HF water solution for 10 min, the barrier layer at the back of the TiO₂ nanotubes completely disappears and the nanotubes become open at both ends. This study offers a facile approach of making separated and open-end nanotubes for electrocatalytic purposes.     

Failure analysis of C/SiC composites plate with a hole by the PFA and DIC method

The progressive failure analysis (PFA) and digital image correlation (DIC) method were used to study the strain distribution and failure evolution of C/SiC composites with a circular hole under tension. The nonlinear constitutive relation based continuous degradation strategy (NCRCDS) was combined with the PFA and compared with the sudden material property degradation strategy (SMPDS). The maximum strain criterion was adopted in the PFA to model local failure. The initiation and evolution of local failure around the hole were studied by PFA and DIC method. The results indicate that the local failure distribution simulated by PFA was close to that of the DIC measurement. The strain field was relevant to the surface topography and the microstructure of the material, and the strain distribution around the hole was affected by the arrangement and the damage of the fiber bundle. The simulated results of the strain distribution were in good agreement with the DIC measurements.     

基于开放小区道路的废水研究

针对小区开放中的废水改进,进行了电极处理废水试验。结果表明,当槽电压5 V、极板间距1.5cm、初始pH=5.5、进水初始质量浓度4 000 mg/L可以达到最佳的废水处理。进水初始质量浓度5 000 mg/L、NaCl投加量4.0 g和电解时间50 min时,COD去除率为45.66%,色度去除率为80.01%。     

基于NX CAM系统的复杂曲面数控铣削方法自动选择研究

为了有效解决复杂曲面数控加工规划困难、对用户的数控加工知识和经验要求高等问题,基于NX CAM软件设计出一套满足复杂曲面精加工需求的铣削方法决策系统,通过提炼出复杂曲面中与特定加工方法相关联的加工特征,合理选择加工复杂曲面的4种主要铣削方法深度轮廓铣、固定轴轮廓铣、混合铣、可变轴轮廓铣中的一种作为加工方法。利用NX Open C(UFUN)和NX Open C++结合的二次开发方式进行实例验证。结果表明：该系统能减少人机交互操作过程,降低对编程人员的技术要求,并在一定程度上减少了数控编程的时间。     

基于MFC的UG二次开发方法的研究

介绍了三维绘图软件UGNX6.0的二次开发工具。针对UG/Open API在开发过程中的不足,分析了如何应用MFC对UG进行二次开发的方法,并以具体实例说明如何利用MFC和UG/Open API开发CAD系统。     

开放式数控系统软件译码模块的研究及实际开发

在开放式数控系统中,完善译码模块可有效避免实际加工中出现的故障及提高数据存取的效率。通过对基于固高GT400运动控制器的数控系统软件中译码模块工作原理的详细分析,借助Visual C++ 6.0开发工具和MFC类库,设计了一种可编辑的列表控件作为译码模块界面,以实例说明具体实现方案并最终验证了方案的可行性。     

平面运动链型综合组合法开链规划的一种改进方法

提出了平面闭式运动链型综合组合法中开链规划的改进方法。为获得给定自由度和构件数的全部独立的运动链结构类型,按照构件数递增的顺序,将开链与相应的闭链进行组合。在开链规划中,如果必要仅需对单杆开链增设铰链,然后依次选定二杆开链、三杆开链等,直到自由度加一的两副杆串联开链,开链规划即可停止。指出了上述方法在型综合应用中的正确性,并从理论上进行了探讨。