Growth and morphology of nanometer LiMn2O4 powder

The growth of Li_1+xMn₂O₄ via detonation reaction was investigated with respect to the presence of an energetic precursor, such as the metallic nitrate and the degree of confinement of the explosive charge. The detonation products were characterized by scanning electron microscopy. Powder X-ray diffraction and transmission electron microscopy were used to characterize the products. Li_1+xMn₂O₄ with 1-2 μm spherical morphology and more uniform secondary particles, but with smaller primary particles of diameters from 20 to 60 nm and a variety of morphologies were found. The oxides produced by this cheap method affirmed the validity of detonation synthesis of nano-size powders.     

USL和USK系列振动筛防噪技术分析

为了改善筛分机械的使用环境，降低筛分机械的噪声，从噪声源入手，从内因和外因两个方面分析了筛分机噪声的形成原因。论述了USL和USK系列振动筛在降低噪声方面所采取的先进技术措施。     

CX6112车铣复合机床设计方案的研究与探讨

文章较系统地论述了车铣复合机床设计方案的形成过程，同时分析了该设计方案的持点，并简要介绍了该产品的主要技术参数和用途，简评了该产品的技术水平。     

Shapes of Submerged Funicular Arches

In this paper, the analytical forms of the shapes of submerged funicular arches are expressed in terms of elliptic integrals. The initial radius of curvature at the apex is related to the water depth at the apex and the axial compressive force. The shape of the submerged funicular arches depends on the ratio between this initial radius of curvature and the water depth at the apex. Using the analytical expressions, the maximum span and height of the submerged funicular arches can be determined explicitly. Besides, the analytical expressions are useful in determining the design parameters for the submerged funicular arches accurately.     

Structural modelling of coprecipitated VTiO catalysts

A statistical study of the particle shape and size of pure V₂O₅ and TiO₂, and samples of coprecipitated V₂O₅---TiO₂ catalysts with different V/Ti ratios, has been performed. They were also characterized by XRD, EDAX, SEM and XPS. The results showed that pure vanadium pentoxide is compose by large square or needle-shaped particles, while pure titanium dioxide has small and rounded ones. VTiO samples presented an area and shape, depending on the V/Ti ratio.

These results and the spectroscopical characterization conducted to a particle model of the catalysts. Those VOTi samples with high V/Ti ratio would have large V₂O₅ crystals acting as support of a V/TiO₂ solid solution. In contrast, those samples with a low V/Ti ratio, would have the solid solution supporting vanadium pentoxide crystals.     

改进工艺操作方法 降低脱硅锆能耗

从分析脱硅的条件出发,引导出新的工艺操作方法、工艺参数和加料方法。用一年的生产实践说明该新工艺操作方法的技术经济效益。     

Two years of operational use of Subpixel Automatic Navigation of AVHRR scheme: accuracy assessment and validation

Automated techniques for satellite imagery navigation and co-location are especially required for environmental monitoring activities intensively using satellite data. In this work are presented the results obtained after 2 years of operational use of the Subpixel Automatic Navigation of AVHRR (SANA) scheme. An automatic method for accuracy assessment of satellite navigation techniques, which permits a preliminary evaluation of their performances, dealing with a large collection of test images is also proposed. The navigation accuracy assessment, performed by using a selection of small islands as reference points, is discussed.Results achieved over more than 400 Advanced Very-High-Resolution Radiometer (AVHRR) scenes confirm that the SANA scheme is a very accurate one (computed mean navigation error is generally about one AVHRR pixel). Furthermore, because of its high processing speed, it can be considered a suitable tool for intensive satellite data processing in multitemporal analyses, especially required for environmental studies as well as for operational monitoring purposes.     

马钢A/OO生物脱氮装置的试运行

介绍了马钢A/OO生物脱氮装置的工艺流程、工艺条件及影响因素,探讨了A/OO生物脱氮工艺试运行中存在的问题和解决措施。     

从含有机物的金废料中提取纯金的研究

物料的经蒸发、燃烧和焙烧除去有机物。焙渣用硝酸浸出可溶性杂质，金富集在渣中。用正水溶解金。金溶液用Ｈ２ＳＯ４和ＮａＯＨ进行纯化处理，用亚硫酸钠沉积金。金粉洗至无Ｃｌ＾－反应后，加稀硝酸煮沸３０￣６０ｍｉｎ，得到纯度９９．９５％以上的海锦金。     

Citations do not solve problems.

D. T. Cambell and D. W. Fiske (1959) made the now-obvious statement that measures of the same variable made by different methods should agree (converge) and certainly should agree better than measures of different variables made by those several methods. Almost everyone accepted that statement, yet the multitrait–multimethod matrices published today show little or no improvement over the published examples cited in 1959. The article raised the conceptual problem of how a variable and its measurement should be linked and the methodological problem of clarifying the nature of methods and their effects. Given these unresolved problems, it is perhaps not surprising that the question of the appropriate statistical analysis of these matrices has also no consensual answer. Perhaps methods and traits or contents are so thoroughly intertwined that their interaction cannot be adequately analyzed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)