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交通线路上任意点对应中桩精度的研究

利用误差传播律和点在任意方向的位差理论,提出并论证了交通线路上任一点对应中桩的横向位差为零,纵向位差等于该点的点位误差。对中桩的误差曲线和误差椭圆的分析认为,误差椭圆无实际意义,误差曲线实用而有效。     

构建出口水产品技术性贸易壁垒防护体系的探讨——以广东为例

国外技术性贸易壁垒(TBT)已成为制约广东水产品出口的最大障碍。根据技术性贸易壁垒的概念和特点,提出针对国外技术性贸易壁垒,构建政府、行业协会和企业三位一体的应对与防护体系,并从制度、政策、人才和经费保证该体系的有效运行,发挥其在预警、示范和保护等方面的功能。     

Internal inlet for wave generation and absorption treatment

A new method of implementing, in two-dimensional (2-D) Navier–Stokes equations, a numerical internal wave generation in the finite volume formulation is developed. To our knowledge, the originality of this model is on the specification of an internal inlet velocity defined as a source line for the generation of linear and non-linear waves. The use of a single cell to represent the source line and its transformation to an internal boundary condition proved to be an interesting alternative to the common procedure of adding a mass source term to the continuity equation within a multi-cell rectangular region. Given the reduction of the source domain to a one-dimensional region, this simple new type of source introduced less perturbation than the 2-D source type. This model was successfully implemented in the PHOENICS code (Parabolic Hyperbolic Or Elliptic Numerical Integration Code Series). In addition, the volume of fluid (VOF) fraction was used to describe the free surface displacements. A friction force term was added to the momentum transport equation in the vertical direction, in order to enhance wave damping, within relatively limited number of cells representing the sponge layers at the open boundaries. For monochromatic wave, propagating on constant water depth, numerical and analytical results showed good agreements for free surface profiles and vertical distribution of velocity components. For solitary wave simulation, the wave shape and velocity were preserved; while, small discrepancy in the tailing edge of the free surface profiles was observed. The suitability of this new numerical wave generation model for a two source lines extension was investigated and proven to be innovative. The comparisons between numerical, analytical and experimental results showed that the height of the merging waves was correctly reproduced and that the reflected waves do not interact with the source lines.     

大容量海水自动分配处理系统

介绍了一种能用于大容量海水中的痕量有机污染物在线富集技术以及所研发装置的工作原理、系统构成.并重点介绍了基于PLC(可编程控制器)技术的自动分配处理系统.该系统可在不中断海水水样提供的情况下.实现大容量海水水样处理的全自动化.     

用集集主震记录研究近断层强震记录的基线校正方法

从集集主震记录中选取有代表性的246个台站的记录作为数据集。在总结国内外基线校正方法的基础上,提出以下校正步骤:(1)初步判定记录中是否包含永久位移信息以便选用不同的校正方法。(2)以积分位移时程的末端平稳为标准,来确定积分速度时程末端拟合出的最优直线斜率作为校正量,去校正原始加速度时程,从而保留永久位移信息。永久位移等值线结果与GPS测量结果大体相符。根据校正结果推测认为:瞬变后保持或扩张或部分回弹,可能是决定永久位移形态的主要物理机制。     

井地三维电阻率反演研究.

本文首先讨论了垂直有限线源三维电阻率反演方法并利用阻尼最小二乘法技术实现了垂直有限线源三维电阻率反演,然后研究了反演中的几个相关问题.模型试验结果表明：初值选择越合理,反演结果越接近真值;地表的观测范围越大,包含深部电阻率的信息越丰富,反演效果越好.     

优化栅格细化算法的线状地物提取

栅格细化算法是处理栅格矢量数据相互转换的常用算法。本文对该算法进行了优化处理,实现了栅格矢量化半自动跟踪和面状地物中心线提取。两种功能的实现都采用人机交互的策略,可以实时、有选择性地提取结果。在栅格转矢量过程中对栅格底图的颜色和质量要求不高,转换速度快、精度高、实用性强,不受内存等硬件限制,可用于GIS数据处理软件,便于推广。     

宁夏南部山区两次冰雹过程对比分析

利用"葵花-8"卫星、多普勒雷达、常规气象观测和0.125°×0.125°ERA-Interim再分析资料,对2018年6月宁南山区午后发生的两次冰雹过程进行对比分析,旨在探明山区降雹及大冰雹生成的有利监测指标.结果表明:"西高东低"形势下,高空急流配合中低层切变线和地面中尺度辐合线有利于冰雹天气的发生.当反射率因子≥...     

海洋测深综合效应的多测线改正技术

提出了水深测量综合效应的多测线改正技术,通过分析水深测量中的波束角效应、地势效应及载体姿态变化对测深的影响,给出二维数字测深仪的详细设计方法,建立描述水深改正的指标,并用实际地形进行仿真。结果标明,该方法实用性强、改正效果明显。