可能最大暴雨的一个数值试验研究

本文应用局地细网格降水数值模式,对汉江上游石泉以上流域的可能最大暴雨(PMP)的计算作了数值检验.检验结果表明:用对水汽场进行放大的水汽输送法,所得流域的降水反而减小;即使考虑极端情况,使水汽全部饱和,其他地区的降水虽得到放大,但此流域的降水仍稍有减小.这说明,对计算PMP的现有简化作法用降水动力模式进行一些检验和修正,是必要的.作者並提出,直接应用降水动力模式计算PMP,应是一个值都注意的方向.     

莱州南部地区黄金资源遥感勘探

用陆地卫星ＴＭ数据制作遥感影像图，在遥感影像图上识别旋扭构造，建立旋扭构造的数学模型，用已知金矿矿脉、岩脉、断裂、河流为控制点，用旋扭构造的数学模型绘制旋扭构造的旋回面（断裂破碎带），即预测的金矿矿脉，再用地质资料的钾化、绢英岩化，黄铁矿化等金矿围岩蚀现象和地面调查资料验证，为化探，槽探、钻探作准备。     

绕横向振动圆柱分离流动的数值研究

本文用由作者提出并发展的一种基于区域分解思想.综合了解N—S方程的有限差分法及涡法各自优点的新数值方法,研究了均匀流绕横向振动圆柱的分离流动,考察了圆柱振动对涡旋脱落,升力,阻力等的影响.成功地模拟了“锁定”这一重要的液固相互作用的非线性现象。计算结果与国外实验结果和其他计算结果符合较好。     

高速复制机记录磁头磁路分析和计算

分析了高速复制机记录磁头磁路结构的特点，根据磁头漏磁通分布，提出了磁头磁阻计算的等效磁路。为了对磁头磁阻精确求解，对加工过程磁头芯材料中产生的磁性变质层用计算机进行了拟合；磁头磁阻的计算中，分别就磁芯材料的磁导率为实数和数的情况进行了讨论。     

沙质海岸防波堤附近岸线变形预测

本文提出一种适用于沙质海岸线变形计算的数值模型.由于本模型采用了隐格式,与过去提出的模型相比,具有计算稳定性好、时间步长可取得较大、上机运行时间大大缩短等优点同时,考虑了岸线随时间变化而引起的对波浪折射的影响;在防波堤下游一侧考虑了波浪绕射和折射对岸滩冲刷的综合作用.作为算例,对某一港口防波堤附近的岸线变形进行了计算,表明用隐格式和显格式模型得到的结果颇为接近,与物理模型试验得到的结果相比较也很一致.因此,本文提出的这一隐格式模型可用于海岸工程的规划和设计中.     

临界热流密度值模化方法研究

本文根据相似理论,利用工质热力学性质的相似性,提出了一种通用化的临界热流密度值模化方法.应用本法,可以将各种工质在不同压力下的临界热流密度值表示在一根曲线上.它既适用于流动沸腾工况(包括垂直流动和水平流动),也适合于池式沸腾工况.用此法整理所得的实验数据表明,该方法是成功的.     

输油管道漏磁检测信号自适应滤波的研究

在采用漏磁法对输油管道进行无损检测过程中,信号会受到各种噪声的干扰。介绍了输油管道漏磁检测方法及归一化最小均方自适应滤波方法。通过实验装置采集了含有噪声的漏磁信号。由于各传感器提离值不能保证一致,对信号进行了补偿调整。将一路的传感器输出信号作为主输入信号,与之相邻的传感器输出信号作为参考信号,采用归一化自适应滤波对主输入信号进行处理。结果表明,采用归一化最小均方自适应滤波方法可使缺陷漏磁信号的信噪比得到显著的提高。     

Spiral rainband in a numerically simulated tropical cyclone

Spiral rainband is a prominent structure of tropical cyclone. Though its forming mechanism, vortex Rossby wave theory, has been widely accepted in recent years,its internal structural features are still not well known. The spiral rainband in the severe tropical storm Kammuri (2002),which caused heavy rainfall in southeast China, is simulated using the mesoscale model MM5 (V3). Results show that the simulated spiral rainband propagates azimuthally at a speed close to that of vortex Rossby wave in theory, and is accompanied with energy dispersion in the radial direction. The structural features of simulated spiral rainband are analyzed with the high-resolution model output including the full physical process. Positive vorticity, ascending motion, horizontal momentum and so on are highly concentrated in the spiral rainband. The convergent moisture of spiral rainband comes mostly from the planetary boundary layer under 1 km.Airflow from the outside of spiral rainband is convective instability, which can provide instability energy for convection development. However, the atmospheric stratification in the inside of spiral rainband is neutral, implying that the instability energy has been released. There is a mesoscale strong wind band just near the spiral rainband in the outer side with a maximum wind speed exceeding 30 m/s, which results from the pressure force acceleration when the air flows into the spiral rainband along the gradient of pressure.     

Simulation of a compartment fire using a zone model

This paper presents the zone modeling analysis of a single compartment flashover fire. Two criteria are applied in the model to judge the onset of ignition for different combustibles. By calculating the total received energy through radiation or the surface temperature of the combustible, the fire growth can be quantitatively determined. The improved zone fire model shows the influence of different combustibles upon the fire growth. This model is better than the traditional zone model because the common criteria of flashover, i.e. an upper layer temperature of 600℃ and the heat radiation intensity received by the floor of 20 kW/m^2, have not been applied in it.     

PES/SPES共混平板复合膜的制备及性能表征

采用浸没沉淀相转化法制备了聚醚砜/磺化聚醚砜（PES/SPES）共混平板复合膜,并对其进行性能表征.铸膜液配比对膜性能有较大的影响：聚合物浓度增大,膜孔径变小、膜厚增大、水通量变小;PVP的添加能有效改善复合膜的亲水性,膜的接触角随PVP含量增大而减小;膜的水通量随铸膜液中PVP含量的增大先增大后减小,当PVP含量为6%时,水通量达到最大值;接触角随共混聚合物中SPES含量的增大而减小,且随聚合物组份中SPES含量的增加,水通量先逐渐增加,并在质量配比为PES/SPES（8：2）时达到最大值,随后水通量逐渐下降.