LTCC高温压力传感器的设计制作和测试

提出了一种基于低温共烧陶瓷(LTCC)的无线电容式压力传感器,并具体讨论了传感器的设计、制作以及测试。与传统的LTCC工艺所不同的是,引入了碳膜作为牺牲层来填充传感器结构的内置式空腔,可以有效地防止空腔在层压和烧结时的变形。测试中传感器表现出了良好的灵敏度,高于之前国际上的研究水平。同时给出了现有结构优化改进的方向。     

热轧板坯出库问题的树搜索算法

热轧板坯的出库问题是连铸-热轧生产中一个重要的组合优化问题, 然而在学术界还很少见到对该问题的研究. 对此, 提出了热轧板坯出库问题总移动次数的一个下界, 开发了一个极小化总移动次数的树搜索算法. 该算法包括一个生成初始解的贪婪算法和一个基于复合移动的递归搜索. 大量的实验和分析表明, 该树搜索算法能在较短的时间内给出板坯出库问题的满意解, 具有重要的理论意义和应用价值.

     

热路径结合程序切片思想在错误定位中的应用

回归测试指对修改后的软件进行测试.为提高回归测试错误分析效率,基于目前热路径思想在程序分析里的应用,结合程序切片方法,提出一种高效的回归测试方法.首先找出在程序执行过程中方法级的执行路径频率,结合应用Dslice切片算法应用用于回归测试,对已知的错误的程序进行调试,比较准确地进行了方法级的错误定位.实验结果表明通过热路...     

热轧工艺关键变量的提取方法

在热轧带钢生产中,终轧温度的控制精度是影响产品质量的重要指标,而影响精轧终轧温度的因素较多且复杂,从单一影响因素上分析对精轧温度的影响是不够准确和全面的.因此,提出了一种基于属性重要性的热轧关键变量提取方法.该方法是从整个决策系统的角度上分析每个可能对精轧目标温度有影响的属性,筛掉对目标温度属性没有影响的属性,确定每一...     

一种改进的WSN非均匀分簇路由协议

针对无线传感器网络中的“热区”问题,提出了一种新的低能耗的非均匀分簇路由协议——LEUC.该协议中,采用分布武与集中式相结合的方式依据节点的剩余能量与相对圆环中心线的位置选择簇首,成簇时综合考虑簇首能量与信号强度,簇内根据簇的大小采用单跳或者多跳传输数据,簇间构建多跳动态路由.仿真结果表明:LEUC协议可以较好地解决“...     

装饰表层低压一体注射绿色模具研究与应用

介绍了装饰表层低压一体注射绿色模具的优势和技术原理,从热流道系统、模架、面料挂针机构、面料压块机构、电控柜顺序控制系统、冷却系统等几个方面阐述了该类模具的关键技术和解决方案,将其应用到中低端汽车内饰件的生产制造,可更好地解决新车的环保问题,消除车内残存的有害物质,具有广阔的市场前景。     

The strength of coating in the lost foam casting process

The functions of the coating in the lost foam casting (LFC) process include developing the strength to support unbonded sand and providing permeable channels to permeate the decomposed expandable polystyrene pattern in-mould. The strengths of coatings developed at room temperature differ from those at a high temperature owing to the heat effect introduced by the filling metal. In this study, we examine the effect of shape and size of refractory particle, and type and added weight per cent of binder in the coating on the strength of the coating.

Experimental results indicate that for either a given particle size or a given wt% of a binder, the coating using flaky alumina and acrylic resin (binder B) develops the greatest strength at room temperature and the greatest hot strength. If a polyvinyl acetate (binder A) is used, the coating generally develops an inferior strength to that of acrylic resin (binder B). For a given resin used in the coating, angular silica used as the refractory particle decreases the strength of the coating at room temperature and its hot strength. In addition, pouring trials demonstrate that if alumina particles (74 μm, mesh No. 200) are added to the coating, the optimum wt% of acrylic resin is 0.25% to 1%. Those coatings produce sound and smooth grey iron plate castings, (5 mm in thickness). Moreover, the optimum wt% of acrylic resin is 0.25% for those producing sound and smooth thick plate castings, (20 mm in thickness).     

论国产单机架四重双卷取热轧机组在我国铝加工业的推广

介绍了国产单机架四重双卷热轧机组组的技术先进性及在我国铝加工业推广的意义。     

Microstructure comparison of ZK60 alloy under casting, twin roll casting and hot compression

The microstructures of ZK60 alloy under conventional direct as-casting (DC),twin roll casting (TRC) and twin roll casting followed by hot compression (TRC-HC) were analyzed by optical morphology (OM),electron backscatter diffraction (EBSD) and X-ray diffraction (XRD).The deformation condition of hot compression is 350 ℃,0.1 s?1.The microstructural evolution under TRC-HC deformation followed by annealing at different temperatures and time was discussed.The results show that TRC provides more modified microstructure compared with DC.Twins are found in TRC processing;dynamic recrystallization (DRX),shear bands and twins are found in TRC-HC.A short annealing time has little effect on hardness,while during a long time annealing,it is found that low annealing temperatures increase the micro-hardness and high temperature decreases it.     

夏季回收制冷机冷凝热的几种方法

提出了夏季利用制冷机冷凝器加热自来水，可以提供降水，降低能耗。