Regulation of Navigation Channel on Mouth Bar of Guanhe Estuary

-Based on the feasibility study of developing the navigation resources of the Guanhe River and the model test results of the mouth bar regulation, this paper presents some basic principles for the regulation of the channel on the mouth bar, for instance, the direction of navigation channel should be identical with that of the ebb tide current and the main waves, and perpendicular to the bathymetric contours. The principles for regulating mouth bars are also discussed in this paper.     

北京正负电子对撞机注入器复测分析

介绍北京正负电子对撞机注和器复测的精度要求，阐述采用波带板激光准直系统与精密水准测量相结合的方法，进行注入器复测的观测、数据处理与调整。根据复测数据分析了隧道地基变形与加速管位置变形及其规律，提出了一些有益的结论与建议。     

浅析运营期间电力隧道自动化监测技术

针对城市电力隧道结构、走向多变、电缆设施多、电磁干扰大等因素,常规的监测方法难以顺利完成的现状,对目前先进的3种隧道结构自动化监测系统进行深入的研究比较,光纤传感自动技术解决了电力隧道结构监测点布设困难,数据受电磁干扰大的问题,能实时有效、可靠、高精度地监控电力隧道,及时掌握隧道的应力、应变及振动等主要结构参数,确保隧道结构安全。研究对类似的城市电力隧道自动化监测具有一定的参考意义。     

原始数据误差对放样点精度影响的探讨

本文在文献[3]的基础上,进一步探讨了工程测量中原始数据误差对放样点精度影响的问题。首先,讨论了施工控制网中原始数据误差存在的形式、特点以及它们对放样点精度影响的传播规律,并建立了关于相对放样点位精度的矩阵公式。在此基础上,对现有的几种常用放样方法中原始数据误差的影响进行了分析和计算。结果表明,在施工放样测量工作中,应该密切注视原始数据误差的影响,并对此问题提出一些合理的建议。     

北京正负电子对撞机直线加速器安装的精密测量

本文介绍为北京正负电子对撞机安装直线加速器所进行的波带板激光准直测量,以及为对测量结果校核所进行的尼龙线准直测量和精密水准测量。并论述了各种准直测量的精度。     

Hydrodynamical Modeling Of Oceanic Vortices

Mesoscale coherent vortices are numerous in the ocean.Though they possess various structures in temperature and salinity,they are all long-lived, fairly intense and mostly circular. Thephysical variable which best describes the rotation and the density anomaly associated with coherent vortices is potential vorticity. It is diagnostically related to velocity and pressure, when the vortex is stationary. Stationary vortices can be monopolar (circular or elliptical) or multipolar; their stability analysis shows thattransitions between the various stationary shapes are possible when they become unstable. But stable vortices can also undergo unsteady evolutions when perturbed by environmental effects, likelarge-scale shear or strain fields, -effect or topography. Changes in vortex shapes can also result from vortex interactions. such as the pairing, merger or vertical alignment of two vortices, which depend on their relative polarities and depths. Such interactions transfer energy and enstrophy between scales, and are essential in two-dimensional and in geostrophic turbulence. Finally, in relation with the observations, we describe a few mechanisms of vortex generation.     

新型磁栅式引张线仪

详细介绍了新型磁栅式引张线仪的原理、基本结构和系统组成，并对仪器的误差进行了初步的分析。陆水大坝的试验结果证明，该仪器可以满足规范要求。     

公路放样中曲线定线方法的探讨

介绍了公路放样中直接定线的几种方法,并给出了详细的实施步骤,供施工放样人员参考.     

新亚欧大陆桥的走向及相关问题探讨

第二亚欧大陆桥已成为国际社会关注的焦点之一，但各国对其走向有着不同的见解和主张。本文概述了第二亚欧大陆桥各种走向的有关问题，并强调对其沿线环境灾害必须重视加以治理。