This paper also show a rough estimate of the gains of this array , because it needs one year ' s data to collect one year ' s noise correlation variation curves and then give a more practical detection ability of the seismic array . one result of this paper is " seismic array site survery data processing software " exploited by the author . the software can calculate the power spectrum of noise for every site , noise coherence function for every site pair , the cross - correlation curves , the root mean square of noise for every site and the array response 此外还计算了该台阵的台阵响应,发现台阵响应的主瓣高而尖;旁瓣很小,这歪姐钮远宣腔挝踏数公镀壁韶逼上拢唆精确啻应:有关此台阵的检测能力,只能给出一个粗略的估计,因为评价一个台阵对地震事件的检测能力需要获得为期一年的观测资料,才能给出一年内噪声场变化的相关值曲线,最终给出更加符合实际的台阵检测能力。
Spectral method and spectral element method are both used in the present dns . the flow is developed from an initial velocity field whose mean and root mean square values are fitted to the experimental data . the reynolds number of the flow is 2250 based on the mean velocity and the radius of the pipe 本文在空间离散上采用谱方法和谱元法的结合,通过在圆管层流速度剖面上叠加随机扰动作为初始场的方法,计算了管长为,平均雷诺数为2250的光滑圆管内的湍流流动,建立了圆管内较低雷诺数下速度场和压力场的数据库。
Welch , 1967 ) , the author calculated noise power spectrum of every site to see if the noise level of the array site accord with ims standard ( the noise level at 5 hz must lower than - 135db ) , and the result suggest that the noise level accord with the ims standard . to find out the principle of noise ' s variation , the root mean square of every site had been calculated and analysised , the result show that several sites had obvious daily variation which is relevant to the tv transmittion tower on the top of dajianshan Welch , 1967 )对台阵阵址各测点的噪声功率谱进行了计算与分析并对各测点的噪声均方根值做了计算,结果表明台阵的背景噪声达到了ims要求的标准(即在5hz处噪声功率谱要小于- 135db ) ,多数测点的噪声有明显的日变化规律,这与大尖山顶的tv发射塔有关。
During the course of the research , the criterions of the interpolation effect are mean error ( me ) , mean absolute error ( mae ) , root mean squared interpolation error ( rmse ) and the difference of mean square deviation between the measured and the estimated surface air temperature . the conclusions are as follows : ( 1 ) by contrasting the gaussian weighted model associated with the error modification with the gaussian weighted model , the error modification is proved to considerably ameliorate the precision of spatial interpolation ; ( 2 ) on the base of the gaussian weighted model , taking altitudinal effect into account can reflect the trend in which temperature changes according to the topographic altitude and may ameliorate the precision of spatial interpolation correspondingly and apparently , which indicates that topographical effect on the preciseness of spatial interpolation can not be disregarded in terms of the region with complicated topography ; ( 3 ) the map of daily surface air temperature distribution , using the modified gaussian weighted model a and b , can accurately reflect the temperature - changing - with - topographical - altitude trend . among them , the better is the model a , whose me is below 0 . 03 ? 在此过程中,采用平均误差( me ) ,平均绝对误差( mae ) ,插值平均误差平方的平方根( rootmeansquaredinterpolationerror ,简称rmsie ) ,插值前后测站要素值的均方差( meansquaredeviation ,简称msd )差值作为判定插值效果的标准,得出如下结论:通过高斯权重法与结合逐步订正的高斯权重法的对比,说明结合逐步订正方案的高斯权重法可大大提高地面日气温的插值精度;在高斯权重法中加入海拔影响项可以反映出温度随地形高度的变化趋势,同时也能较大地提高地面日气温的空间插值精度,说明在地形复杂的区域,地形影响在插值精度中是不可忽略的;对于高斯权重法的两种改进方案得到的地面日气温分布图都能很好地反映出表面大气气温随地形高度的变化趋势。
The acceleration and displacement of the structural model under el - centro earthquake excitation is simulated by matlab . the comparison of the response under no control and predictive control is made . the max value and the rms ( root mean square ) value of the acceleration of the top floor decrease 50 % and 47 . 7 % respectively 以matlab为仿真工具,对12层高层建筑结构模型在ei - centro地震波激励下的加速度和位移响应进行仿真,并对结构在无控制和预测控制两种情况下的响应进行比较,结构顶层加速度的最大值和均方根值分别减小50和47 . 7 ,位移的最大值和均方根值分别减小74 . 5和71 . 9 ,减震效果十分明显。