Flow lines on the poincaré sphere as an aid to the study of mode polarization in lasers

It is shown that the concept of flow lines on the Poincaré sphere is a useful tool in the study of mode polarization in lasers. As an example, a case from recent literature is analyzed.     

成对电离室相对中子灵敏度的确定及在(n,γ)混合场中吸收剂量的测定

本文对用铅减弱法测 k_u 的历史情况作了简短回顾,并介绍了处理铅减弱法实验数据的方法。在由 Sames 静电加速器上 T(d,n)~4He 反应产生的(n,γ)混合场中,用铅减弱法对自己设计制作的平行板流气电离室(TE-TE,Mg-Ar 和 Al-Ar)作了测量。由计算给出了组织等效电离室的 k_T值,且确定出:k_U(Mg-Ar)=0.193±0.010及 k_U(Al-Ar)=0.160 0.011。同时,对窄束、宽束(n,γ)混合场相应的中子、γ组分的吸收剂量作了测定。     

Simultaneous and successive processing: An attempt at replication.

J. P. Das et al (see record 1975-08765-001) claim that A. R. Luria's (1966) distinction between simultaneous and successive modes of information processing provides a more fruitful way of classifying cognitive processes than (a) the hierarchical models of C. Burt (see record 1973-10531-001) and P. E. Vernon (see record 1963-03855-001), A. R. Jensen's (see record 1969-09740-001) Levels 1 and 2, or A. Paivio's (see record 1976-01839-001) dual coding system of imagery and verbal mediation. Their published factor analyses are surveyed, and shown to yield only partial support for their views. A broader battery of 14 tests was given to 91 university students, and responses were factor analyzed. Two of the obtained factors involved various kinds of rote memorizing, and thus could be regarded as successive processing. Four other factors did not yield a general simultaneous factor, but classified the tests under Number-Spatial, Verbal-Spatial, Perceptual Reasoning, and a specific Digit Memory factor. Overall, the 6 factors tend to follow a multiple-factor, or a hierarchical model, rather than a dichotomous classification. (French summary) (28 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Gasification of carbon using calcium oxide

Gasification experiments were performed on Spherocarb samples containing 5 weight % calcium oxide at a gasification temperature of 760°C. The atmosphere was hydrogen/water mixture maintained at a mole ratio of 1:1. There is a correlation between the rate of gasification of Spherocarb and the degree of crystallinity of the calcium oxide residue. Segregation of the calcium oxide results in considerable loss of catalytic activity.     

松辽盆地北部深层天然气录井综合识别与评价技术

针对松辽盆地北部深层火山岩岩性复杂、气水层识别及评价难题,大庆油田加大了综合录井资料的开发应用力度,通过对储层物性好差程度的快速判断、储层评价参数的求取和气水层评价图版的建立,提出了深层气水层识别与评价新方法,在实际应用中见到了明显的效果,及时准确地评价了徐深1、卫深5、徐深6、徐深601等井的高产气层,为大庆深层气勘探取得新突破发挥了重要作用,较好地适应了复杂地区天然气勘探的需求。     

Molecular electronics by the numbers

Molecules are an attractive option to develop nanoscale electronic devices. Experimental measurements of current-voltage characteristics of individual molecules have been possible for several years and have revealed rich structure and diverse behavior. This paper reviews recent theoretical work by the authors in which current-voltage characteristics of individual molecules are computed using a fully quantum-mechanical parameter-free method. The results provide detailed understanding of transport in molecules in the context of data and go further by obtaining information about the role of molecule-electrode contacts and predicting the behavior of three-terminal molecular devices and the factors that control their performance     

DMC的成型技术

DMC是我国近几年发展起来的新型绝缘材料,用途十分广泛。本文介绍DMC的制造工艺、制品设计、模具设计、成型方法以及制品缺陷的原因和对策。