分光双星天龙座θ的光电视向速度观测和新分光解

1985—86年用加拿大自治领天物台视向速度仪观测得到此星23个速度值,和文献中前人数据结合求得此星1898—1986年轨道周期P=3.0707943±0.0000010天,固定P于此值可求得光电视向速度观测的椭圆和圆轨分光解,用Bassett判据选取后者为此单谱双星的新分光解。     

Spectroscopic binaries near the north galactic pole

Photoelectric radial-velocity measurements show that HD 105982 is a spectroscopic binary with a period of 3.7 years.     

Settling velocities of particulate systems 15: Velocities in turbulent Newtonian flows

The success in previous papers of this series in obtaining closed form solutions to the sedimentation of individual particles and to the suspensions of particles in fluids motivated the application of the same procedure to the turbulent flow of Newtonian fluids in conduits.The purpose of this paper is to present explicit equations for the Fanning friction factor and of the average velocity of a Newtonian fluid in a cylindrical tube, for any value of the Reynolds number and dimensionless roughness.Previously published equations for the friction coefficient are either implicit or explicit in the friction coefficient but dependent on the Reynolds number. Since the Reynolds number depends on the pipe diameter and fluid velocity, in both cases iterative method must be used to calculate the flowrate.By defining a dimensionless pipe diameter and a dimensionless average fluid velocity, and using conduit-flow material properties to define characteristic size and velocity parameters, explicit equations were obtained for the friction coefficient and for the average flow velocity valid for different roughness and flow regimes.     

Elastic-wave velocities for porous media with power-law distribution of pore sizes

 A system consisting of an elastic matrix with randomly distributed pores of uniform shapes but with sizes governed by a power-law distribution is investigated in a theoretical way. The velocities of elastic waves propagating through such a system are calculated. The obtained results are that the velocities decrease with increasing total porosity and for a given porosity velocities moderately decrease with increasing absolute value of the exponent D in a power-law distribution of pore sizes. Received: 3 July 1995 / Accepted: 2 August 1996     

AN EXPERIMENTAL STUDY ON WAVE VELOCITIES IN ROCKS FROM THE YANHUAI BASIN AND ITS GEOLOGICAL IMPLICATIONS

依据延怀盆地深部的地温地压条件，用模拟实验方法测定了该区代表性岩石的纵波和横波速度以及石英、角闪石在一定深度相变引起的波速变化，提出在中地壳同时具备低速高导的物质可能不是含石英多的岩石而可能是含水矿物多的岩石；讨论了研究区的地壳组成，认为上地壳的上部可能是由泥质灰岩一类的岩石组成，下部可能是由花岗闪长岩一类的岩石组成，没有低速高导层的地区可能是由花岗闪长岩和石英岩等组成，有低速高导层的地区可能由角闪岩相的岩石组成，下地壳可能由角闪片麻岩、中长麻粒岩、辉石麻粒岩等组成     

我国超声地震模型试验的理论研究与实践

超声地震模型试验是地球物理模拟研究的重要手段之一，50年代后期，我国开始了超声地震模型试验的研究实践，在40多年的发展历程中，我国的超声地震模型试验在方法理论、研究实践和工程应用上都得到长足的发展，取得了丰硕的成果，成为我国地球物理学研究中的一个重要组成部分．     

江苏王港盐沼潮沟的水动力和悬沙输运过程

在江苏王港盐沼湿地的两条潮沟内分别设立观测站位，进行了水位、潮流流速和悬沙浓度的观测。结果表明，潮沟水流的流速与潮位变化率之问存在着显著的线性相关关系，并受到潮沟本身特征(如潮沟级别、坡度、所在部位等)的影响。潮周期中的流速突变现象发生于涨潮初期、潮沟满溢和滩面水归槽阶段。涨潮期间，悬沙浓度和流速有显著的正相关关系，悬沙浓度的变化受再悬浮作用控制；落潮期间，悬沙浓度的变化基本上与流速大小无关，悬沙输运以平流作用为主。大潮期间盐沼潮沟内悬沙净输运方向由陆向海。     

海洋沉积物声速与其物理-力学参数的相关性

通过对海洋沉积物声速及其物理-力学参数相关性的初步分析和研究,可以找到估算沉积物压缩波速Vp和切变波速Vs的经验式,最终为海底沉积物的性质进行声学遥测、为发展海底参数声遥感服务。本文给出了7个较为理想的回归方程。沉积物的物理参数与Vp有密切的关系;力学参数对Vs的预报有较大的作用。若增加物理参数作为修正项,其效果更佳。     

Verification of linear theory for particle velocities in wind waves based on field measurements

Analyses are presented of field measurements of spectral transfer functions between surface elevation and subsurface three-dimensional particle velocity in wind-generated waves, in conditions ranging from young seas to old swells. The results are in agreement with the linear theory predictions to within the measurement error margin, which is estimated to be ± 5% for the gain functions and ± 4° in phase as far as the possible systemic errors are concerned. No correlation is found of the degree of agreement between measurements and linear theory with wave age or wave sleepness.