大尺寸透明件注射成型技术的研究进展

分析了飞机透明件注射成型技术的基本思路,并与传统热弯成型技术进行了比较。介绍了国外飞机透明件注射成型技术的研究与发展经历,以及国内研究进展。     

面框注射成形浇口的改进设计

手机面框注射成形模具的浇口设计,不仅决定了制件的精度和外观,而且影响到产品二次加工的方便性.分析此类模具的设计,发现浇口采用侧浇口、搭肩进胶和牛角进胶形式,容易产生浇口去除痕迹、产品变形严重,以及二次加工工艺性不好等一系列缺陷.通过改进浇口形式,采用类似牛角进胶,但是浇口尺寸加大,进胶浇道从斜销的下面绕过进入制件.增设斜销出模机构,使模具开模时,斜销运动给浇口让出位置,确保浇道凝料脱模时能跟产品连在一起.满足了浇口痕迹小的外观要求,而且浇道凝料在产品二次加工中能够辅助定位和固定,起浇注和工艺二重作用.     

高炉富氧大喷煤的操作实践

马钢１３＃高炉利用原料条件改善的有利条件，提高富氧用量，维持适宜的风口前端理论燃烧温度，并通过优化高炉操作，促使炉况稳定顺行，从而提高了喷煤比，进一步强化了高炉冶炼，并使各项技术均得到了很大提高。     

SINOVATION软件在塑料模具研发设计中的应用

分析了注射模设计的现状，介绍了SINOVATION软件在注射模设计中的应用实例，以及该软件的综合优势。     

以“铁立方超级模架”为基础平台的显示器外壳模具的设计与快速制造

通过对显示器外壳模具的设计与制造，介绍新型模架技术在设计和制造过程中的特点。     

延时注入对驻波加速管X线输出量的影响

一、引言驻波加速管工作于脉冲方式时,在每个微波脉冲的开始和结束时,加速管内场强有一个建成和衰减的过渡过程,在过渡过程中,加速场强随时间不断变化,如果电子束和微波功率同时注入及馈入驻波加速管,则将有较多的低能电子产生,它们不仅增加加速管的负载,使输出能谱变坏,而且这部份低能电子对X线输出量的贡献也不大。由于过渡过程的     

不同硬段含量溶液聚合和RIM嵌段聚脲合成及性质的比较

用溶液聚合法和RIM合成了软段为胺端基聚环氧丙烷,硬段为4,4′-二苯甲烷二异氰○用二乙基甲苯二胺扩链的热塑性嵌段聚脲。用凝胶渗透色谱和应力-应变研究了这些聚合物的性质。和溶液聚合相比,RIM聚脲有显著的低分子量部分,但二者力学性能差别不大。     

NEW FUNCTIONS FOR MICROFLUIDIC COMPONENTS BY USING MICRO METAL INJECTION MOLDING (μ-MIM)

Microfluidics and microreaction technology constitute an upcoming field in a variety of industrial branches. As this technique is implemented in the daily business of industrial companies the cost-effectiveness of the production process starts to become an issue. The micro metal injection molding (μ-MIM) process provides freedom of design for a broad spectrum of materials (metals, metal alloys, and polymers). Catalytic as well as bio-compatible materials have already been structured using this technology. Furthermore, μ-MIM shows the potential of a cost-effective production technique that can be adapted to produce microstructured parts for various applications. As a case example a microfluidic structure was applied for water purification. The reactor surface was coated with an active photocatalytic (TiO₂) modified nano-layer using dip coating. Subsequently, it was covered with a glass plate adhered with a two-component adhesive. For determination of hydrodynamics, measurements by means of μPTV have been performed. For investigations of water purification and sanitization the reactor was first fed with a water stream contaminated by a special dye to optimize the hydrodynamic parameters and afterwards with a water stream contaminated by Escherichia coli to investigate the degradation of germs. This was done by illuminating the TiO₂-coated reactor with UV light. The results indicate that this new type of reactor has an exceptional high potential to eliminate germs in drinking water.     

Channel width dependence of hot electron injection program/hot hole erase cycling behavior in silicon-oxide-nitride-oxide-silicon (SONOS) memories

The channel width dependence of hot electron injection program/hot hole erase cycling behavior in silicon-oxide-nitride-oxide-silicon (SONOS) memories is investigated. While the trapped charge profile-dependent overerasure is observed in 10-μm-wide device, it is suppressed in 0.22-μm-wide device. Both the overerasure suppression and gradual positive threshold voltage shift in narrow device are explained as an elevated hot hole injection efficiency followed by more pronounced redistribution of the hole profile in the channel-center and the suppression of the lateral migration of injected holes in the channel-edge, by combining the measured endurance characteristics and TCAD simulation results. Main physical mechanisms are three-dimensional distribution of the electric field by gate/drain voltage, increasing interface states, and their trapped charge with cycling in the channel-edge.     

粉喷桩在锡场电排站地基处理中的应用

广东省揭阳市锡场电排站工程基础下卧层为厚度达14 m的淤泥质粘土,其含水量较高,地基承载力较低。为提高地基承载力,减小建筑物沉降量,在该软基处理中采用了粉喷桩加固措施。结果表明:设计合理,效果显著。