多级网格环境下的土地利用统计方法

 基于土地资源多级网格服务架构LR-MGSP（Land Resource Multi-Grid Service Platform），对土地利用统计服务按照原子服务和聚合服务的分类方式进行分级处理，提出对原子服务采用基于统计基表的增量式密集统计，对聚合服务采用基于网格资源状态的聚合统计，从而实现基于多级网格资源的土地利用汇总统计方法。通过与传统土地资源管理系统的性能对比测试，结果表明：该方法在统计效率上明显优于传统统计方法，且随着统计量的增大，效率优势更加明显。该方法的应用实例也表明，它能够满足海量土地资源数据高效统计处理的需求，也为跨机构跨部门处理其他土地资源业务提供了参考借鉴。     

新站油田原油族群类型及成因初探

为了探讨新站油田流体非均质性分布规律及成因 ,利用新站油田 2 2 8个油砂抽提物的族组成特征、饱和烃气相色谱、生物标志物组成特征等多种资料 ,选用不同参数 ,利用传统的关系图件法 ,并首次尝试运用数学统计方法 ,来划分原油族群 .在总结族群划分结果的基础上 ,分析了不同族群的分布规律 ,初步探讨了其形成控制因素 .结果表明 ,葡萄花油组油砂可区分为三种类型 ,而黑帝庙组油砂有两种不同类型 .在此基础上 ,对不同族群分布规律的对比分析发现造成两油组几种族群的主要原因是受到构造和岩性因素的控制 ,此外次生改造作用也是影响族群分布的因素 .     

概率统计教学与学生科研创新能力培养

从教学方法和前沿知识的渗透方面,讨论了概率统计学教学中如何培养学生科研创新能力的问题。     

统计假设检验在机械加工中的应用

阐述了统计假设检查的基本思想，并在机械加工中应用有关的检验方法     

《急就篇》的复字问题

清人多有《急就篇》中没有重复用字的说法,其影响及于晚近,这其实是不确切的。陈黎明先生首先对《急就》本文作了统计,发现共有239个重见字。但由于使用版本及文字由繁转简时出现的问题,陈氏的统计小有失误。本文对《急就篇》原文三十一章的重复字重新进行了准确的统计,并且按顺序标出了各字重复出现的章数,非常方便学者利用。     

强子多重数与质量的关系

本文运用统计方法研究了强子多重数与质量的关系，多重数倒易统计起伏ａＮ对质量有依赖关系，与发射源也存在依赖关系。     

提高概率论与数理统计课程教学质量的思考

讨论了概率论与数理统计课程的重要性和课程特点,结合教学实践,提出了激发学习兴趣,注重基本概念和方法的训练,利用计算机辅助教学培养应用能力,利用网络加强与学生的交流等教学改革措施.实践表明,这些措施有利于提高学生的学习积极性和课堂教学效率.     

Selection of optimal window length using STFT for quantitative SNR analysis of LFM signal

An adaptive approach to select analysis window parameters for linear frequency modulated (LFM) signals is proposed to obtain the optimal 3 dB signal-to-noise ratio (SNR) in the shorttime Fourier transform (STFT) domain. After analyzing the instantaneous frequency and instantaneous bandwidth to deduce the relation between the window length and deviation of the Gaussian window, high-order statistics is used to select the appropriate window length for STFT and get the optimal SNR with the right time-frequency resolution according to the signal characteristic under a fixed sampling rate. Computer simulations have verified the effectiveness of the new method.     

统计信息产品电子商务化涉及问题浅析

信息社会人们对统计信息的需求日益增强,使得统计信息作为一种产品进行交易成为现实。从电子商务的视角,探讨了统计信息产品的电子商务化过程中涉及的若干问题,比如统计信息产品的界定、交易模式及平台的建设、安全及产品定价及提供方式等,为统计信息产品电子商务化提供了思路。     

Statistic characteristics and weather significance of infrared TBB during May―August in Beijing and its vicinity

In order to meet the demand of nowcasting convective storms in Beijing, the climatological characteristics of convective storms in Beijing and its vicinity were analyzed based on the infrared (IR) temperature of black body (TBB) data during May―August of 1997―2004. The climatological probabilities, the diurnal cycle and the spatial distribution of convective storms are given respectively in this paper. The results show that the climatological characteristics of convective storms denoted by TBB≤-52℃ are consistent with those statistic studies based on the surface and lightning observations. Furthermore, the climatological characteristics of May and June are very different from those of July and August, showing that there are two types of convective storms in this region. One occurs in the transient polar air mass on the midlatitude continent during the late spring and early summer. This type of convection arises with thunder, strong wind gust and hail over the mountainous area in the northern part of this region from afternoon to nightfall, the other occurs with heavy rainfall in the warm and moist air mass over the North China Plain and vicinity of Bohai Sea. This study also shows that the long-term data of IR TBB observed by geostationary satellite can complement the temporal and spatial limitation of the weather radar and surface observations.