模糊关系数据库的一种广义模型

提出了模糊关系数据库的一种广义数据模型ＧＦＲＤＭ,它是一般模糊关系数据模型的推广,可用来描述现实世界较为普遍的模糊对象。已提出的各种模糊关系数据模型在某种条件下可看作为本模型的特例。文中引入了广义模糊关系的概念,讨论了广义模糊关系代数的操作：广义模糊并、广义模糊交、广义模糊差、广义模糊笛卡尔积、广义模糊投影和广义模糊选择等。广义模糊关系中不仅每一个元组具有模糊性,而且元组的属性值（精确值或模糊值）也具有模糊性（可信度）,捕获了更多模糊数据的语义。广义模糊选择操作中允许用户自定义广义模糊比较运算以及指定阈限,从而增强了模糊查询的表达能力和灵活性。     

Ionospheric precursors observed at low latitudes around the time of koyna earthquake

On December 11, 1967 at 05:21 LT, an immense earthquake of magnitude 6.7 struck Koyna, the Indian province of Maharashtra. Its epicenter was located at geographic latitude 17.37°N and longitude 73.75°E with depth of about 3 km. Ground based measurements show variation in the critical frequency of ionospheric F2 layer (foF2) before and after the shock. In the present study the behavior of F2-region of ionosphere has been examined over the equatorial and low latitudinal region ionosphere during the month of December 1967 around the time of Koyna earthquake. For this purpose, the ionospheric data collected with the help of ground-based ionosondes installed at Hyderabad (located close to the earthquake epicenter) Ahmedabad, Trichirapulli, Kodaikanal and Trivendrum have been utilized. The upper and lower bound of Interquartile range (IRQ) are constructed to monitor the variations in foF2 other than day-to-day and diurnal pattern for finding the seismo-ionospheric precursors. Some anomalous electron density variations are observed between post midnight hours to local pre-noon hours at each station. These anomalies are strongly time dependent and appeared a couple of days before the main shock. The period considered in this study comes under the quiet geomagnetic conditions. Hence, the observed anomalies (which are more than the usual day-to-day variability) over all stations are likely to be associated with this imminent earthquake. The possible mechanism to explain these anomalies is the effect of seismogenic electric field generated just above the surface of earth within the earthquake preparation zone well before the earthquake due to emission of radioactive particles and then propagated upward, which perturbs the F-region ionosphere.     

通用自动测试系统模型化设计

针对通用测试系统对系统统一模型的迫切需求以及目前ATE(Automatic Test Equipment)模型化设计的不足,基于信号建立了一套完整、有效的ATE系统模型.此模型将ATE系统的硬件资源以及UUT(Unit Under Test)均进行了模型化处理.提出了基于TFF(Test Foundation Framework)的基本信号模型;提出了完全基于信号的仪器驱动模型;提出了基于测试与诊断相结合思想的UUT模型;提出了基于模型间信息共享的思想和路径以逻辑开关描述思想的路径模型.该模型体系为系统资源配置、仪器可互换、测试程序自动生成以及故障诊断提供了强有力的模型基础,从而大大加快了ATE的设计过程,从很大程度上降低了开发成本.     

Vertical wavenumber spectra of atmospheric ozone measured from ozonesonde observations

Vertical profiles of ozone have been measured at balloon altitudes. Our purpose is to examine the character of vertical wavenumber spectra of ozone fluctuations, to assess the possible roles of gravity wave field in ozone fluctuations, and to determine dominant vertical wavelengths of ozone spectra. Vertical wavenumber spectra of 12 ozone fluctuations obtained during June–August 2003 are presented. Results indicate that mean spectral slopes in the wavenumber range from 4.69 × 10⁻⁴ to 2.50 × 10⁻³ cyc/m are about −2.91 in the troposphere and −2.87 in the lower stratosphere, which is close to the slope of −3 predicted by current gravity wave saturation models. The consistency of the observed spectral slopes with the value of −3 predicted by current gravity wave saturation models suggests that the observed ozone fluctuations are due primarily to atmospheric gravity waves. At m = 1/(1000 m) the mean spectral amplitude is over 30 times larger in the lower stratosphere than in the troposphere. Mean vertical wavenumber spectra in area-preserving form reveal dominant vertical wavelengths of ∼2.6 km in the troposphere and ∼2.7 km in the lower stratosphere, which is consistent with the values varying between 1.5 and 3.0 km estimated from the velocity field and temperature field at these heights.     

基于熵限制的Baldwin-Lomax湍流模型

针对Baldwin-Lomax(BL)模型在模拟超声速复杂流动中的不足,提出一种基于熵限制的新型修正方式.分别采用原始的BL模型(BL-origin)、修正后的BL模型(BL-entropy)以及Wilcox k-ω两方程模型对超声速平板、超声速二维压缩拐角以及膨胀-压缩拐角3个典型算例进行计算,结果表明BL-entropy 能够较好地获取长度尺度进而得到均匀合理的涡粘性分布.同时,该修正方式简单高效并且适用于其他与超声速边界层有关的模型,具有较大的发展潜力.     

锂离子电池失效率模型的探讨

以工作电流和工作温度(壳温)为主要考虑因素,建立了锂离子电池基本失效率模型和工作失效率模型.以试验数据为基础,参照国军标GJB/Z299,提出了失效率相关的调整系数(π系数)及其取值方案.采用失效率模型,通过数值计算得到基本失效率预计值,将预计值与试验值进行了比较.最终计算结果表明,得到的失效率模型可以应用于工程实践,锂离子电池效率模型的建立,为其可靠性预计提供了基础.      

Comparison analyses on the 150 × 150 lunar gravity field models by gravity/topography admittance,correlation and precision orbit determination

We analyzed the 150 × 150 lunar gravity field models, LP150Q, GLGM-3 and SGM150, using the power spectrum on the lunar nearside and farside, the lunar global and localized gravity/topography admittance and correlation, and Chang’E-2 precision orbit determination to investigate which model is a more effective tool to estimate geophysical parameters and determine the lunar satellite precision orbit. Results indicate that all gravity field models can be used to estimate the lunar geophysical parameters of the nearside of the Moon. However, SGM150 is better in such computation of the farside. Additionally, SGM150 is shown to be the most useful model for determining the lunar satellite orbit.     

北斗系统格网电离层延迟算法研究

介绍了北斗系统下格网电离层延迟算法原理及建模方法。利用25个参考站的模拟数据,建立了覆盖我国地区的格网电离层延迟模型。通过仿真给出格网点(35°N,115°E)的格网电离层垂直误差及用户穿透点(36.94°N,118.44°E)的用户电离层垂直误差在一天内的变化,结果显示一天内格网电离层垂直误差及用户电离层垂直误差的平均值分别为0.871m和0.877m。     

基于构件的模型库和方法库的设计和实现

在智能决策支持系统开发环境的分析和设计的过程中,提出了实现此开发环境的一种设计原理和系统结构,讨论了在决策支持系统设计建模中的模型库和方法库的设计和实现,在对分布式对象技术和对象建模技术分析的基础上,给出了基于对象建模技术和构件对象模型技术的模型库和方法库的分析、设计和实现.     

导弹系统总体方案设计的研究

以空空导弹总体方案设计为例,简单扼要介绍了导弹系统总体方案设计的全过程,给出了设计流程图,介绍了方案评估时加权系数的确定方法及方案评估方法,这一方法有利于通过人机交互在计算机上实现总体方案设计,改变了传统设计方法,最后给出了空空导弹的设计结果并明确了使用时应注意的问题.