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。     

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.     

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.     

熔融石英耐火材料

阐述了熔融石英耐火材料的主要性能与应用领域。     

The Calcia–Zirconia Phase Diagram Revisited: Stability of the Ordered Phases φ1 and φ2

Single crystals of CaO-stabilized ZrO₂ containing between 15.3 and 18.9 mol% CaO were heat-treated for 5000 h at 1200°C to study the stability of the ordered defect-fluorite phase, CaZr₄O₉ (φ₁). Subsequent TEM analysis of the equiaxed φ₁ domains in samples richer than approximately 18 mol% in CaO showed a random distribution of φ₁ variants, with no preferred interfacial habit planes. A critical review of the literature, combined with the new data, supports the Stubican-Hellmann-Hannon version of the phase diagram in the region 15 to 26 mol% CaO and 1000° to 1400°C and strongly suggests that φ₁ is a stable phase in the ZrO₂-CaO systems.     

熔融石英陶瓷的性能及其应用

介绍了石英陶瓷的性能特点、制备过程及应用领域