烟花药剂自动混药技术

为提高烟花自动生产线中最易出现爆炸的混药工序的安全性及混药质量,提出滚筒制备发射药、响药的技术。介绍混药机的主要功能,分析其工作原理和结构,给出其工艺流程,列出混药滚筒及有效装载容量的计算方法。结果表明：该技术能实现烟花药剂的自动混药及出药功能,保证药剂混合均匀,配比精确,实现人机隔离和无人化生产,达到预期的设计要求,并已应用于双响炮自动装药装配生产线中。     

基于802.11a标准的CMOS正交调制器和上变频器

采用0.18μm CMOS工艺,设计并实现了应用于WLAN IEEE 802.11a的正交调制器和上变频器.正交调制器在传统的Gilbert单元基础上,采用负反馈跨导放大器来提高线性度;上变频器采用LC谐振网络作混频器负载来提高增益和电压输出摆幅.测试结果表明,在1.8V电源电压下,谐振频率点的1dB压缩点P1dB为-3.6dBm,功率转换增益为-3.6dB,电流消耗大约45.8mA.     

静态混合器气液两相流压降的数值模拟及实验研究

气泡流经过静态混合器的压降问题涉及到舰船动力系统性能的好坏。在分析了气泡平均驰豫时间的基础上,结合k ε湍流模型,利用平衡流模型模拟静态混合器内形成的稀疏湍流气泡流,得到了混合器内两相流流场。空气—水系统的压力降实验表明,计算流体力学模拟能够很好地预测SMV型静态混合器内气泡流的压降,是静态混合器设计的有效手段。     

注射机中腔穴传递式混合器的结构与混合机理

介绍了注射机中腔穴传递式混合器(CTM)在注塑模塑过程中的混合机理及混合特性，并评述了该类混合器的分散功能和混合效果。     

Single frame correction of motion artifacts in PMD-based time of flight cameras

One of the leading time of flight imaging technologies for depth sensing is based on Photonic Mixer Devices (PMD). In PMD sensors each pixel samples the correlation between emitted and received light signals. Current PMD cameras compute eight correlation samples per pixel in four sequential stages to obtain depth with invariance to signal amplitude and offset variations. With motion, PMD pixels capture different depths at each stage. As a result, correlation samples are not coherent with a single depth, producing artifacts. We propose to detect and remove motion artifacts from a single frame taken by a PMD camera. The algorithm we propose is very fast, simple and can be easily included in camera hardware. We recover depth of each pixel by exploiting consistency of the correlation samples and local neighbors of the pixel. In addition, our method obtains the motion flow of occluding contours in the image from a single frame. The system has been validated in real scenes using a commercial low-cost PMD camera and high speed dynamics. In all cases our method produces accurate results and it highly reduces motion artifacts.     

双工质塑料冷混机设计研讨

介绍了可提高塑料混合时冷却效率的双工质塑料冷混机，并简要叙述了立式，卧式和立式搅龙双工质冷混机却装置冷却物料的工序。     

过磷酸钙折流混合器的改进

由于绿原化工有限公司过磷酸钙装置生产能力由 6 70 t/ d(实物量 )提高到 84 0 t/ d,折流混合器负荷增大 ,出现折流环磨损加快等问题。采用若干技改措施 :扩大折流环内径、改变折流混合器喷射方向、采用新材料制作折流环 ,使折流混合器能满足 84 0 t/ d过磷酸钙生产的需要     

剪切型调距式密炼机的性能研究

对啮合型、剪切型和剪切调距型3种密炼机的混烁实验结果进行了比较分析,对剪切调距型密炼机的性能进行了研究,实验表明：新开发的剪切型调距式密炼机能够混炼均匀,分散度高,能量消耗少,排胶温度低,可通过改变间隙实现优化混炼,尤其适合于快速混烁作业和难以分散而又快速生热的胶料的混烁,应用前景比较广淘.     

一种新型混合装置的开发与研究

混合与许多化工过程密切相关，为了克服传统的搅拌混合装置或结晶器的缺点，运用薄膜振动混合的理念，开发出一种新型的混合装置／结晶器。其具有低剪切应力无搅拌混合和达到固体颗粒的均匀悬浮。在完成新型混合装置的冷模设计加工后，测定了它的流型；并用脱色法测定了甘油与水调配出不同中高粘度的流体的混合时间；通过测定不同振动频率下的混合时间的变化，绘制出混合时间变化曲线，从而可确定最佳的操作条件；通过加入不同密度的固体颗粒，模拟结晶过程的固体相悬浮状况。这种新型混合装置具有较高的实用价值，市场前景广阔。     

Polyacrylonitrile/Nylon 6 Blends: Preparation and Characterization

Summary: Polyacrylonitrile (PAN) particles with micro‐size ranges (0.15–2 μm) were prepared by emulsion and dispersion polymerizationa and in supercritical carbon dioxide media. The PAN particles were blended with Nylon 6 (PA6) at 220 °C by using a miniature mixer; it was found that melt‐mixing was possible for PAN‐rich compositions as high as 70 wt.‐%. Blends were characterized by scanning electron microscopy, IR, viscosity measurements, differential scanning calorimetry, and dynamic mechanical thermal analysis (DMTA). The size and shape of original PAN particles were retained in PAN/PA6 blends. The useful range to blend PAN particles size was less than 1 μm in terms of shape retention of the PAN particles in blends. Blends with 40 wt.‐% PAN content were found to be melt‐processable. The elastic modulus was higher for PAN/PA6 blends than pure PA6.

SEM photograph of PAN‐SC/PA6 blend with a 40/60 weight ratio.