除砂工艺在拜尔法氧化铝生产中的应用

中铝山西分公司独家采用的拜耳法赤泥旋流器一螺旋分级机除砂工艺，工艺简单，除去了赤泥中的大颗粒粗砂，对沉降槽、赤泥过滤机的稳定运行起到了重要作用。     

高速定时分件供送螺杆系统研究新进展──变螺距螺旋线设计新方法初探

着重阐述在高速定时分件供送螺杆基础理论的系统研究中，长期以来未能很好解决的一些难题，进一步探讨合理设计变螺距螺旋线的新方法以及确定有关参数的若干准则。     

一种机器人动力学的旋量方程

本文从旋量入手,详细深入地论证和推导了螺旋变换,逆变换及其微分,并结合牛顿-欧拉方法给出了一种用于机器人动力学分析计算的旋量方程。全部推导过程十分简洁,思路独特,得到的机器人动力学模型也非常简洁,而且便于数字计算。文中理论同时也为其它空间机构的运动和动力分析提供了一条新路子,文章最后给出的例子证实了文中理论和数学推导的正确性.     

Physical and Molecular Properties of Re-extruded Starches as Affected by Extruder Screw Configuration

Amylomaize V, amylomaize VII, wheat and rice starches were extrusion cooked in a single-screw extruder at 140°C barrel temperature and 140 rpm screw speed. Extrudates were ground and re-extruded through a 3 mm cylindrical die nozzle using screws with no mixing (NM), 1 mixing (1M) or two mixing (2M) elements. Overall expansions were the highest and bulk densities were lowest with 1M. Radial expansions for amylomaize V, amylomaize VII, and wheat starches were the highest with 1M and lowest with 2M. Amylopectin contents of starches decreased with corresponding increases of gel permeation chromatograph peak II fractions when number of mixing elements was increased. λ_max values of peak I and peak II decreased upon re-extrusion of starches with increasing number of mixing elements.     

Starch-stearic Acid Complex Development within Single and Twin Screw Extruders

Corn starch was extruded with 4% stearic acid in Brabender single screw and twin screw laboratory extruders. The screws were cooled and removed and samples were collected from locations along the screws. In the single screw extruder, starch gelatinization as determined by DSC and polarized light microscopy started in the compression zone and was completed in the metering zone. Starch-stearic acid complex formation as determined by iodine binding capacity and X-ray diffraction started at the same point as gelatinization and increased to a maximum near the tip of the screw. In the twin screw extruder, starch gelatinization and starch-stearic acid complex formation started at a distance of seven screw diameters and continued from there to the die end.     

高速分件供送螺杆全程单函数运动规律及特性分析

根据分件供送工艺要求，用一种新方法推出了变螺距供送螺杆全程单函数运动规律。在计算机上分析了该运动规律的各特性函数及其图象，证明它是一种全程统一、自然连续、惯性冲击小、动力特性好且应用方便的优良运动规律。此外，还探讨了螺杆基本参数的变化规律。为变螺距供送螺杆理论和设计的发展，提供了新的途径。     

应用全程单函数运动规律的螺杆分件供送装置的干涉分析

用计算机对采用全程单函数运动规律的螺杆分件供送装置进行了干涉分析，证明了该运动规律可以在不切除拨轮、不改变各部件关系的条件下，保证物件与拨轮之间不发生干涉，使物件顺利地由螺杆转换至拨轮。该运动规律的这一优点非常有利于它的应用。     

异形瓶罐定时分件供送螺杆通用性的研究

当今，为适应包装容器日新月异的变化，不断提高包装产品的竞争能力，对包装机械基础件──定时分件供送螺杆装置提出了高速化、多样化、通用化和多功能化等要求。本文着重于螺杆通用性的研究，通过剖析螺杆对瓶罐实现稳定供送的基本前提，以及非原配瓶罐在供送过程中与基准螺杆螺旋槽应有的协调关系，论证了形状尺寸相近的柱形瓶罐之间，柱形与锥台形瓶罐之间，还有单个外廊形状虽不尽相同，但参与相贯的主体部分却完全或接近相同的各类组合瓶罐之间，依给定条件确定基准螺杆有无通用性的根本准则。     

眼底自适应成像系统中的二自由度头托设计

眼科临床上所使用的简易头托限定医生与受试者的距离不能超过一臂之长,因此无法用于较为庞大的眼底自适应成像系统。为了达到眼底自适应成像系统与受试者瞳孔快速对准、稳定定位的要求,设计了一种可长距离控制的二自由度的头托。采用具有自锁能力的梯形丝杠驱动头托垂直运动,采用传动效率高的滚珠丝杠驱动头托水平运动,以步进电机提供动力。基于PIC16F877单片机,完成了头托移动控制的软硬件设计,并在MPLAB与Proteus环境下进行了联合仿真实验。仿真结果表明,所设计的头托可在竖直方向和水平方向以20μm的精准度定位,能够实现长距离、快速准确的瞳孔对准和左右瞳孔切换过程,是眼底自适应成像系统的良好辅助工具。     

盘壁喷管的三维流场计算和结构设计优选

文中运用UG软件对涡喷发动机火药起动器盘壁式喷管进行整体三维建模,采用FLUENT对起动器喷管进行流场计算,得出在不同设计值下喷管的出口速度。根据分析结果对盘壁喷管结构进行优化设计。