直记式强震加速度仪的动态特性与高频误差分析

本文在时域、频域范围内，对直记式ＱＺＹ型（中国）、ＳＭＡ—１型（美国）、ＳＭＡＣ—Ｂ２型（日本）强震加速度仪的动态特性进行了分析，给出了评价系统跟踪和复现地震加速度信号的快速性、平稳性和准确性的动态性能指标．在此基础上，分析和讨论了直记式加速度仪的高频误差，给出了系统幅频，相频相对畸变误差公式和系统参数设置的误差估计方法，计算了加速度仪系统的高频误差分布．最后，讨论了高频误差的校正方法．     

鹤岗地震台DSQ型水管仪观测系统日常问题分析及维护

针对鹤岗地震台在实际工作中遇到的各种问题,结合台站实际情况,分别从主机系统、电子记录系统等方面,提出仪器运行中经常出现的问题.并总结DSQ水管仪在日常问题中系统维护的具体解决办法,以此提高观测质量和工作效率.     

Velocity profiles and incipient motion of frazil particles under ice cover

A series of experiments for the incipient motion of frazil particles under ice cover have been carried out in laboratory under different flow and boundary conditions.Measurements on flow velocities across the measuring cross-section at different water depths have been conducted.Based on these experiments under both ice-covered and open flow conditions,the impacts of solid boundary(such as ice cover and flume sidewall) on the distribution of flow velocity profiles have been discussed.The criteria for the inc...     

乌什地震台伸缩仪资料影响因素分析

通过对乌什台伸缩仪资料的分析,总结了现阶段伸缩仪资料的影响因素,其中气压变化对观测数据有明显的干扰,两者呈正相关关系;仪器自身工作状态不正常、仪器间的相互检修也会影响数据稳定;突然停电、电压波动、瞬间的强雷电干扰等都会对仪器的工作状态产生较大的影响。     

丰满台水管仪记录到的8级大地震前兆波特征浅析

总结了丰满台水管仪两个测项在4次≥8级大震前记录的前兆波,对其特征进行初步分析,认为可能是断层预滑或断裂预扩展产生的,可能是大地震孕育过程中的一种反应,对大震的预报有一定的参考意义。通过对前兆波特征的深入研究可以为地震预测提供有力的依据。     

磁通门磁变仪与经典磁变仪状态函数之比较

分析了影响磁通门磁变仪定向状态函数和经典磁变仪定向状态函数改变的因素，对磁通门磁变仪定向状态函数和经典磁变仪定向状态函数及其稳定性进行了比较，得出了有益的结论。     

Mountain Glacier Flow Velocities Analyzed from Satellite Optical Images

Mountain glaciers are sensitive to environment. It is important to acquire ice flow velocities over time for glacier research and hazard forecast. For this paper, cross-correlating of optical images is used to monitor ice flow velocities, and an improvement, which is called ＂moving grid,＂ is made to this method. For this research, two remote-sensing images in a certain glacier area, dur-ing different times are selected. The first image is divided into grids, and we calculated the correlation coefficient of each window in the grid with the window on the second image. The window with the highest correlation coefficient is considered the counter-part one on the first image. The displacement of the two corresponding windows is the movement of the glacier, and it is used to calculate glacier surface velocity. Compared to the traditional way of dividing an image with ascertain grid, this method uses small steps to move the grid from one location to another adjacent location until the whole glacier area is covered in the image, thus in-creasing corresponding point density. We selected a glacier in the Tianshan Mountains for this experiment and used two re-mote-sensing images with a 10-year interval to determine this method.     

山西省多普勒雷达非降水回波应用研究

本文研究了多普勒天气雷达速度图上非降水回波（不包括地物回波）的空间结构，并对太原雷达站业务运行以来多普勒天气雷达观测到的“非降水回波”的速度特征进行了深入、系统的分析。发现由大气湍流和云滴后向散射所致的非降水回波，虽然强度很弱，但其速度回波却代表了环境风的三维结构，对临近预报有5h～7h的提前量，为临近预报提供了一种新的有效手段。