Al2O3对镁铬耐火材料致密化的影响

为了提高镁铬耐火材料的烧结性能,通过考察气孔率、体积密度和常温耐压强度与Al2O3加入量之间的关系,讨论了Al2O3添加剂对两种不同镁铬耐火材料致密化的影响.结果表明,镁铬耐火材料的骨料不同,Al2O3对其烧结性能和致密化的影响也不一样.     

棕刚玉粉中Al2O3含量分析方法的探讨

对耐火材料——棕刚玉粉的质量分析控制，提出了用实用性的检测方法测定其Al2O3含量。通过与国家标准分析方法的对比试验，证实快速实用分析方法测定棕刚玉粉中Al2O3含量是可行的。     

螺杆泵专用抽油杆试验研究

以往大庆油田螺杆泵井所用抽油杆柱大多都是沿用抽油机井上使用的普通连接结构抽油杆,这种抽油杆适合于上下往复运动,抗拉强度是抽油杆的主要抗力指标。而螺杆泵井所用抽油杆,其主要运动形式为旋转运动,承力方式也由抗拉变成抗扭,使得普通连接结构抽油杆应用在螺杆泵井上以后,经常出现断脱事故。针对这些现象,研制了插接式螺杆泵专用抽油杆和锥螺纹式螺杆泵专用抽油杆。文章介绍了2种结构抽油杆的防断脱原理、优化设计方法、室内检测及在大庆油田的使用情况,并针对现场出现的典型事故进行了分析,提出了相应的改进意见。     

Fluidization of the active component of catalysts in catalytic formation of carbon assisted by iron and nickel carbides

A series of vanadium-tin mixed oxide catalysts have been prepared by the solid-state reaction of V₂O₅ and SnO₂ at 1250°C. The fresh and the used catalysts have been characterized by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). High temperature oxygen chemisorption (HTOC) has been employed to titrate the coordinatively unsaturated vanadia sites. Ammoxidation of mesitylene has been carried out on these catalysts and an optimum composition of vanadium is arrived at. Better yields of tricyanobenzene (TCB) compared to literature values are obtained. A good correlation between the oxygen uptake and the TCB yield extends the applicability of HTOC to the fused oxide system.IICT Communication No. 3507.     

锥形阀压电薄膜泵的初步研究

提出一种适应高频工作状态的压电薄膜泵结构，实步分析了所采用的锥形阀的工作原理与作用，设计了试验泵结构，加工了样机，通过试验证明了锥形阀的有效性，为进一步的研究打下了基础。     

圆锥孔径测量方法与误差分析

圆锥孔径的测量往往比较困难、且精度较低。提出长度测量仪器与环规配合使用,应 用比较测量的方法检测圆锥孔的直径。通过计算和分析可以得出,当被测圆锥孔径不大于180 mm 时,其测量不确定度可小于1.84 μm。给出了测量方法和不确定度计算公式供操作时参考。     

一种低成本128位高精度浮点SIMD乘加单元的设计与实现

SIMD单元集成已经成为提高处理器性能的重要途径之一。虽然定点SIMD单元的硬件复用低成本设计技术已经较为成熟,但是,大部分浮点SIMD单元的硬件设计还停留在简单的硬件复制方法上。本文针对日益增长的128位高精度浮点操作的计算需求,提出了其相应的SIMD低成本硬件结构方案。综合实验结果表明,所提出的SIMD浮点乘加单元比传统128位高精度浮点乘加单元具有更加优化的性能与面积参数。     

不同品种磷肥在土壤中的退化研究

对钙镁磷肥（FMP）、过磷酸钙（SSP）和部分酸化磷肥（PAPR）在河南郑州西岗沙土和河南西华县潮土中的退化情况进行了研究。     

Emission of excited potassium species from an industrial iron catalyst for ammonia synthesis

The angular dependence of potassium emission-desorption is studied from a fused iron catalyst of the type used for ammonia synthesis. The excited species (K^*, K _n ^* , etc.) and positive ions K⁺ have strongly different angular distributions. The bilobular distribution measured for ion desorption is concluded to be either due to excited atoms, so-called Rydberg atoms, or excited clusters. Both types of species have to desorb from the edges of the sample and become field ionized and deexcited just outside the sample, as reported in previous studies on an iron oxide catalyst. The peak in the normal direction measured for excited species is due to excited cluster formation outside the catalyst surface. Similarities with previous results for other catalysts are observed. The possibility that the promoter function of potassium in the ammonia synthesis is due to excited species is pointed out.On leave from Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Cracow, Poland.