强震现场流动无线遥测地震台网观测系统的研制

描述了强震现场流动无线遥测地震台网观测系统的技术设计，系统构成，工作原理及应用。     

大震前地磁场时空间线性度变化的初步研究

把用来分析地震波波形的时间线性度和空间线性度两种方法，应用到地磁资料分析当中，具体分析处理了１９７６年７月２８日唐山Ｍｓ７．８地震和１９８９年１０月１９日大同Ｍｓ６．１地震前后地磁场资料，并对这两次地震前后地磁时空线性度变化情况进行了研究。所得结果表明：①较大地震前地磁场的时空线性度均可能呈现出较明显的下降异常变化，有些在震前回升，②各分量的时空线性度呈现异常的时间基本上同步，并与波速异常发展趋势基本相符。     

用第六代国际地磁参考场确定的东亚地磁非偶极场时空变化规律

利用近期公布的第六代国际地磁参考场（ＩＧＲＦ）计算，分析了１９４５年以来东亚地磁非偶极场的时空变化特征，并用中国地磁场模型对结果进行了检验，得到的主要结果是：１９４５－１９９０年，东亚地磁非偶极场Ｘ、Ｙ分量缓慢向北和向西方向移动，东亚磁异常中心位置基本稳定，中心附近Ｚ分量的强度变化具有明显的大约１５年左右的增强和减弱期。中心附近Ｘ、Ｙ的零值点的移动方向与地磁北极的移动方向一致。     

BANDPASS FILTERING ANALYSIS WITH GAUSSIAN WEIGHTING FUNCTION IN TWO-DIMENSIONAL FIELDS

This paper examines the response of the bandpass filter with Gaussian weighting function to arbitrarytwo-dimensional fields and proposes a new concept of relative response function.Based on the properties of relative re-sponse function,satisfactory weighting parameters C_1 and C_2 are obtained.By studying two cases,the procedure of us-ing structure function curves to choose the maximum response wavelength is formulated.It is shown that bandpass fil-tering offers some improvements to the analysis and forecast of mesoscale weather processes.     

ERROR COMPARISON OF WIND FIELD RETRIEVAL FROM SINGLE AND DUAL-DOPPLER RADAR OBSERVATIONS

The error distributions of the wind fields retrieved from single and dual-Doppler radar observations are given inthis paper.The results indicate that the error of dual-Doppler retrieval depends on the position in the scan region of thedual-Doppler radar.The error of single-Doppler retrieval by using velocity azimuth processing(VAP)technique de-pends on the angle between the directions of wind and the radar beam.Generally,the winds retrieved from single Doppl-er radar are close to those retrieved from dual-Doppler radar.But,the error distribution of the single-Doppler retrievalis different from the dual-Doppler retrieval.We simulate the retrievals of single Doppler observation by the use of theoutput wind data from a 3-D numerical model of severe convection.The comparison of the simulated single-anddual-Doppler retrievals shows that the VAP may be a suitable technique for the operational analysis of mesoscale windfields.It can also be used as a supplement to wind field retrieval in the field experiment.     

气压场巨涨落与非线性地震系统状态的突变和临震预报研究（上）

本研究以非线性孕震系统在爆发前夕的外敏性为物理基础，对大气扰动下的岩体失稳突变问题进行了初步的探讨，给出了气─－地耦合的一般表示，并连续分析了云南近３５年来大气压力场演化与场内近百次５级以上地震（内含１９次６级，４次７级）的基本关系，系统地证明了绝大部分强震都是在其上覆大气涨落加剧及与邻区气压梯度增大时突然爆发的，这种自然共性的揭示，既是对理论的认证，也丰富了短临地震预报的科学依据。     

航天器工作的地磁环境

航天器工作环境中的地磁场可以用于定向和姿态控制，为空间飞行提供了一个天然的坐标系，但地磁场与带电、带磁的航天器相互作用又在一定程度上影响着航天器的运动参数（如自旋、定向、轨道等），地磁场的变化，特别是磁暴和亚暴期间剧烈的磁场扰动会对航天器的正常运行和航天器仪器的有效工作造成重大影响，与磁场变化相伴随的磁层、电离层扰动，高能粒子流对航天器的工作、空间通讯、对宇航员的安全都可能有严重影响。磁扰期间，中性大气的密度、温度的变化也会影响航天器的轨道和姿态，本文从地磁场结构和变化综合评价航天器工作的地磁场环境，为航天器利用地磁场和防护地磁场变化带来的有害影响提供一些背景材料。     

水平电偶源频率测深中全区视电阻率定义的新方法

从电磁场的统一性出发，分析了水平电偶源频率测深中等效电阻率的算法原理和具体定义．分析表明，等效电阻率可明显地改善波区视电阻率在非波区场的畸变，较为形象、直观地反映出地电断面的电性变化．数值计算、三维模型计算和实际数据处理表明，等效电阻率具有良好的特性和应用前景．     

A numerical simulation of gas flow during coal/gas outbursts

Summary A model of the gas flow in airways during an instantaneous outburst of coal and gas is formulated and solved numerically using MacCormack's explicit finite-difference scheme. This model is based on the assumption that geological structures, in-situ stresses and high-gas-pressure gradients play important roles in initiating an outburst, with the gas content and gas-pressure gradients being the most dominant factors. The fluid-dynamic processes that occur after an outburst are computed by the numerical integration of the complete time-dependent Navier-Stokes equations. The mixture velocity, the density and the gas-concentration profiles in both time and space domains (immediately after an outburst) are presented. The global results are useful in gaining an improved understanding of gas-flow patterns during coal/gas outbursts and in determining the range of the disturbance so that effective methods of control can be developed.Nomenclature a speed of sound - C gas concentration (mass) - C _v specific heat at constant volume - C _p specific heat at constant pressure - CFL Courant-Friedrichs-Lewy number - E total energy of the mixture - F the vector defined in Equation 27 - G the vector defined in Equation 28 - h entropy - h _i entropy at inlet - J _xi diffusion flux in the i-direction - k thermal conductivity of a gas - M Mach number - P pressure of a mixture (the partial pressure of gas) - P gas pressure - P _a atmospheric pressure     

冬、夏季青藏高原地面加热场激发的500hPa遥相关型

本文用青藏高原地面加热场强度来表征高原的加热状况，并用统计的方法，分析了冬季（２月）和夏季（７月）青藏高原地面加热场强度与同期５００ｈＰａ位势高度的遥相关关系，得到如下结论：冬季高原地面加热场可激发北半球５００ｈＰａ产生遥相关型，这种遥相关型可看成是二维Ｒｏｓｓｂｙ波列由低纬向东北方向传播；夏季高原地面加热场可激发北半球５００ｈＰａ产生类似于ＥＵ型的遥相关，这种遥相关型可看成二维Ｒｏｓｓｂｙ波列由