铁电晶体TGS的快速生长

报道了TGS晶体的溶液状态及其快速生长的实验结果。发现了pH为2.52的溶液是实现快速生长的最佳溶液,利用快速旋转叶片来加速溶液对流,对于截面积为40mm×40 mm的(010)面,其生长速度达到了5mm/d,对快速生长的TGS晶体的性能研究表明:其热电和介电性能也发生了一些变化。     

Sulfur transformation during rapid hydropyrolysis of coal under high pressure by using a continuous free fall pyrolyzer☆

The behavior of sulfur transformation during rapid hydropyrolysis of coal was investigated using a pressurized, continuous free fall pyrolyzer under the conditions of temperature ranging from 923 to 1123 K and hydrogen pressure up to 5 MPa. The yields of sulfur converted to gas, tar and char were determined, together with the analyses of sulfur form distributions in coals and chars. The results showed that the decomposition of inorganic sulfur species was affected only by the temperature, while the increases in temperature and hydrogen pressure obviously enhanced the removal of organic sulfur from coal. The extent of organic sulfur removal was proportional to the coal conversion, depending on coal type. A significant retention of gaseous sulfur products by the organic matrix of the char was observed during hydropyrolysis of a Chinese coal above 1023 K, even under the pressurized hydrogen atmosphere. The kinetic analysis indicates that the rate of organic sulfur removal from coal was 0.2th-order with respect to the hydrogen pressure, and the activation energy for total sulfur removal and organic sulfur removal is 17-26 and 13-55 kJ/mol, respectively. The low activation energies suggest that the transformation and removal of sulfur from coal might be controlled by the diffusion and/or thermodynamic equilibrium during hydropyrolysis under the pressurized conditions.     

金属铝诱导法低温制备多晶硅薄膜

以氢气稀释的硅烷（SiH4）和硼烷（B2H6）为气源,利用等离子体增强化学气相沉积法（PECVD）制备出p型a-Si薄膜.采用铝诱导晶化技术对不同厚度的铝膜对a-Si薄膜晶化的影响进行了研究.实验中发现,铝膜溅射为10 s的非晶硅薄膜样品在450℃下退火10 min后,p型a-Si结构仍为非晶态,铝膜溅射为20 s的非晶硅薄膜在450℃下退火20 min后,p型a-Si薄膜开始晶化为polySi薄膜,并且铝膜厚度越厚,则a-Si薄膜晶化程度越强.     

飞机蒙皮局部腐蚀的原位快速修复工艺

采用电刷镀设备对飞机硬铝合金蒙皮表面局部的腐蚀进行阳极化，然后实施喷漆，从而达到了原位快速修复的目的。介绍了快速修复的原理及工艺过程、采用间隙盐雾试验考察了修复层的耐蚀性能结果表明，飞机铝舍金蒙皮修复后耐蚀性能为处理前的4倍，使用寿命得以延长：     

合成气中氨含量测定方法的改进

用快速测定仪测定气体中的氨含量，采气量为50ml，可准确测出高含量氨体积百分比含量为80%-100%和低含量氨体积百分比含量为1%-20%的样气，该仪器结构简单，易于制造，测定过程简单，结果准确，一目了然。     

EDTA络合滴定法快速测定碳酸锆中锆铪含量

锆铪氧化物含量的测定通常采用苦杏仁酸[C6H5CH（OH）COOH]重量法。该法经典、准确,但操作烦琐,分析时间长,对日常生产、入库或销售不利。乙二胺四乙酸二钠（EDTA）络合滴定法（容量法）操作简便、快速、准确,适合日常检验。但用基准氧化锌、高纯二氧化锆或氯氧化锆来标定EDTA时,测定结果偏低。采用重量法和容量法相结合,先用重量法测定锆铪氧化物含量,以已知锆铪氧化物含量的碳酸锆作标定物,再标定EDTA标准溶液的滴定度,用此EDTA标准溶液测定相同原料生产的碳酸锆。该法简便、快速、准确,试剂安全性好。     

Three Dimensional Modeling of Shaft with Process Structures on CATIA

Three dimensional models of shaft were completed on CATIA Part Design module with the Chinese national standard （GB） process structures such as chamfers, threads and tool withdrawal grooves, center holes, flat/woodruff/gib head taper keyseats, grinding undercuts, straight-sidedsplines, circlip slots and collars. The modeling steps are arranged in dialog menu interface by VB 6.0, the shaft creator, that permits users input geometric feature based parameters explicitly, and the standardized processdata are reorganized in Excel files that can be invoked correspondingly in the modeling procedure. It is aimed that this process may supply a simple way for shaft rapid modeling and comprehensive discipline for engineering students in their professional design activities.     

碳化钙气压法快速测定砌块含水率

开发新型工程现场快速检测砌块含水率方法,与传统的烘箱干燥方法进行比较,开展了工程现场试验,研究了在上海地区自然干燥环境条件下不同砌块墙面、朝向、砌块深度等对砌块含水率变化的影响。研究表明,该方法测试结果可信、操作方便,可用于现场快速检测。     

激光推进用于飞行器姿轨控制的分析与仿真

激光推进成本低、可靠性高,可用作飞行器的空间推进和姿态调整。建立了考虑反馈控制和激光推进的飞行器动力学模型,模型中的操纵控制项模拟了飞行器操纵系统和激光推进产生的力、力矩。详细研究了确定操纵项的方法,使用自适应飞行控制律,给出一种通过求解线性方程组确定操纵控制项的方法。以圆形盘旋轨迹为例,进行了数值模拟,计算结果显示,激光推进下的飞行器能很好按照目标轨迹飞行,并对计算结果进行了分析。     

基于SolidWorks的CAD模型直接切层研究

针对面曝光快速成形系统的需要,提出了基于SolidWorks的CAD模型直接切层方法.利用SolidWorks在工程图环境下的剖切功能,实现对CAD模型的直接切层.解决了对复杂CAD模型切层时出现的截面错位问题.论述了用于多种曝光模式的截面填充样式的实现方法.以该切层方法得到的CAD模型的截面图形作动态掩膜,利用面曝光快速成形系统成功制作出了三维实体原型,表明该直接切层方法适用于面曝光快速成形系统.