AVO理论和方法的一些新进展

本文阐述了如下内容:①提出了平面弹性波反射和透射的统一公式,并阐明了转换波和非转换波动力学特征的差异。指出,“在不同弹性介质分界面上入射平面弹性波,转换波的反射系数和透射系数是射线参数p的奇函数;非转换波的反射系数和透射系数是射线参数p的偶函数”。②作为上述结论的直接应用,本文提出一组以奇偶幂级数形式表示的平面弹性波反射和透射的近似公式,包括目前广泛用于地震勘探的Aki公式和Shuey公式。与前人的公式相比,本文公式具有物理意义明确、岩性关系清晰、形式简洁和易于分离变量等优点。新的近似公式扩展了AVO分析的应用领域、易于实现更为全面的岩性参数反演,并可分离纵波和横波。③针对地震勘探中的水平叠加技术存在的问题,本文提出了AVO滤波的概念,发展了一种振幅保真、高分辨率、高信噪比的处理新方法——AVO曲线拟合滤波,并且指出更为真实的岩性分析方法必须抛弃传统的CDP叠加概念,这是地震勘探的必然趋势。文中最后以实例说明了这些新的处理方法的原理和应用。     

Comparison of shear strength of osteotomies fixed with absorbable self-reinforced poly-L-lactide and metallic screws

Nine experimental osteotomies on the neck of a sheep's left mandibular condyle were fixed with self-reinforced poly-L-lactide (SR-PLLA) screws. Metallic screws were used in a group of nine sheep for the same fixation of the osteotomy. The right condyle of each sheep acted as a control. Radiographic analysis was carried out at 3 weeks and at sacrifice (6, 12 or 24 weeks) when the shear force needed to break the osteotomy site was measured. No significant differences were detected at 3, 6 or 24 weeks, but at 12 weeks the SR-PLLA-fixed condyles seemed to tolerate shear force somewhat better.The results are very promising and have led us to continue with development of smaller screws and a self-reinforced poly-L-lactide plate.     

John P. Campbell: Award for Distinguished Scientific Applications of Psychology.

Presents the citation for John P. Campbell who received Award for Distinguished Scientific Applications of Psychology "for his many different contributions to the field of industrial and organizational (I/O) psychology." A brief profile and a selected bibliography accompany the citation. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Monaural and binaural story recall by schizophrenic subjects.

P. Green and other investigators have reported that schizophrenic Ss have poorer recall of stories presented to both ears than to the single best ear (binaural deficit) and poorer recall of stories presented to the left ear than to the right ear (monaural asymmetry) than do normal control Ss. These studies are plagued by potential methodological problems, including differences in overall accuracy, which artifactually affect the difference scores, and scoring methods that are vulnerable to systematic bias. In this study, scores of schizophrenic, bipolar, and normal control Ss on the Auditory Comprehension Test were compared. Scoring bias was avoided by the use of blind scoring and a revised scoring manual, and artifactual effects of accuracy were considered in interpreting the results. Contrary to previous findings, the groups did not differ on either monaural asymmetry or binaural deficit. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

小型材全连轧改造实践

介绍了天津轧三制钢有限公司型一分厂全连轧改造的情况及改造后的工艺平面布置,工艺流程,主要设备选型,性能参数和工程技术水平。通过技术改造,企业取得了良好的经济效益。实践证明:全连续化轧制,实现“一火”成材是小型材生产厂生产与改造的方向。     

Confidence level and feeling of knowing in question answering: The weight of inferential processes.

What are the sources of metamemory judgments in question answering? Exp 1 showed that the level of confidence in the correctness of a recalled answer (CL) is a reliable measure (test–retest G?=?.87) and a valid predictor of recognition (G?=?.55/.58). In contrast, the feeling of knowing the correct answer (FOK), although reliable (G?=?.82), is a poor predictor of recognition (G?=?.11). In Exp 2 it was discovered that FOK levels are more highly correlated with beliefs about what should be known than are CL judgments. Controlling for the relationship between FOK and those beliefs eliminates any correlation between FOK and recognition (G drops from .27 to .08), which is not the case with CL (G remains as high as .52). These data suggest that CL is based on the retrieval of at least some elements of the right answer, whereas FOK may be derived from recency or familiarity effects elicited by the question itself. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Concentrations of cadmium, lead and copper in atmospheric precipitation in Czechoslovakia.

The concentrations of Cd, Pb and Cu in wet and dry atmospheric precipitation were measured in 13 regions of Czechoslovakia. The Pb and Cd contents of rainwater were found to decrease with increasing rainfall intensity. The highest enrichment of Cd, Pb and Cu was observed in ice-accretion deposits; increasing amounts of metals were found at higher altitudes, i.e. 700-1000 m above sea level. The electrostatically separated fractions are rather high in Cu and Pb (approximately 90%), whereas Cd contributes less than 50%.