银河系运动学参数的确定

利用 2 0 2个太阳附近疏散星团的视向速度和自行观测资料 ,对太阳的运动和银河系的运动学参数进行了研究。其中 ,距离在 0 .5kpc到 2kpc之间的 12 8个疏散星团对平均太阳运动分量的解算结果是 (u0 ,v0 ,w0 ) =(- 13.8± 1.4 ,- 5 .0± 1.6 ,- 11.6± 2 .9)km/s ;Oort常数和银河系径向运动参数的解算结果分别为 (A ,B) =(16 .9± 1.1,- 11.6± 2 .6 )km·s- 1·kpc- 1及 (C ,D) =(2 .5± 1.1,- 2 .1± 0 .9)km·s- 1·kpc- 1。     

Mass segregation in young stellar clusters

We investigate the evolutionary effect of dynamical mass segregation in young stellar clusters. Dynamical mass segregation acts on a time-scale of order the relaxation time of a cluster. Although some degree of mass segregation occurs earlier, the position of massive stars in rich young clusters generally reflects the cluster's initial conditions. In particular, the positions of the massive stars in the Trapezium cluster in Orion cannot be due to dynamical mass segregation, but indicate that they formed in, or near, the centre of the cluster. Implications of this for cluster formation and for the formation of high-mass stars are discussed.     

Mass distribution in the open cluster NGC 1664

We start with the hypotheses that the cluster space is limited by an ellipsoid with a semiprincipal axis directed to the observer and that the star density inside of concentric ellipsodal layers remains constant, although varying from layer to layer. It results that the mean star mass at the periphery of the cluster is 0.59 Sun masses smaller than that at the center.     

鄂尔多斯盆地北部塔巴庙地区二叠系储层物性影响因素研究

鄂尔多斯盆地北部塔巴庙地区二叠系砂岩储层是主要的工业天然气产层之一。通过对砂岩储层样品的多项实验分析成果进行研究分析后认为,储层岩石颗粒的粒度、分选和成分是控制储层物性的主要因素;自生高岭石和自生石英起到改善储层物性的作用,而自生绿泥石和碳酸盐矿物则对储层物性有伤害作用。     

青州市实施废弃矿坑治理性开采的探讨

废弃矿坑治理是落实绿色发展、循环发展、低碳发展工作理念的一项重要内容。青州市人民政府结合该市实际,认真落实节约集约和资源优先战略,在废弃矿坑治理方面进行了有力的探索,走出了一条资源节约集约和高效利用的新路子,为全市露天采矿权监管和低丘缓坡未利用土地开发利用工作提供了有益借鉴。