化脓性脊柱炎影像学诊断（附23例分析）

笔者报告了２３例化脓性脊柱炎。本文着重分析对比了Ｘ线平片和ＣＴ检查结果，通过分析对比，发现ＣＴ检查优于Ｘ线平片，并有助于对化脓性脊柱炎早期作出诊断。主要影像学表现：早期，软组织肿胀和脓肿形成，骨质呈虫蚀状破坏，随之破坏区周围出现增生硬化。ＣＴ还能发现炎块中的气块，晚期骨修复占优势，即骨质增生硬化，骨桥形成，最后可产生骨性融合。     

从集集地震看建筑物震害与地震动参数的关系

本文根据9．21台湾集集大地震中南投县、台中县、台北县和苗栗县的建筑物震害调查资料确定出这4个主要受害地区的平均震害指数,然后义计算出这4个地区的地震动峰值加速度、峰值速度、峰值谱加速度、峰值谱速度、峰值谱位移的平均值。将这些均值分别与平均震害指数进行基于最小二乘法的线性回归,发现峰值速度和震害指数有非常好的相关性,相关系数接近1．0,而峰值加速度与震害指数相关性只有0．8,这说明地震动峰值速度能够体现地震动对脆性结构的破坏势,与以往将不同次地震的记录和资料混淆在一起研究而获得峰值加速度与震害有很好相关性形成了对比。     

基于波形特征的露天钼矿微震事件的识别分析——以卓资山钼矿为例

基于前人研究成果以及现场的实测结果,采用卓资山露天钼矿微震监测项目产出资料,提取了5类微震事件的波形特征和时频特征。波形特征显示:微地震的振幅、辐射均匀性和频率变化特征表明微地震是由于岩层受到单力偶和剪切力作用破裂而产生;爆破具有P波初动方向向上、S波不易识别的特点,包含“初震段、主震段、尾波段”三段变化形态;小型边坡滑坡波事件属楔体滑坡,是由多个“加速—缓冲—终止”构成,波形是由包络线呈“V”字形的多组脉冲波列组成;机械开采震动事件具有自振能量不变、脉冲幅度相差很大、持续时间间隔不确定的特点;运输车辆波形振幅具有形态“弱—强—弱”、等频率、包络线呈多段纺锤形的特征。时频空间分布可以分为相对独立、界限分明的两类:一类包含微地震、爆破、机械开采、小型边坡滑坡事件,另一类只包含车辆运输事件。     

Improved fuzzy weighted optimum curve-fitting method for estimating the parameters of a Pearson Type-III distribution

ABSTRACT

The objective of the curve-fitting method is to determine the optimal distribution by parameter estimation. The selection of the parameter estimation methods and the determination of the parameter estimation results may vary according to the different aims of the curve fitting, as well as the different accuracies and positions of the points. To solve the problem, the fuzzy weighted optimum curve-fitting method (FWOCM) was used to deal with the characters. The deficiencies of the original FWOCM were analysed, and it was found that the membership function and nomograph were unable to effectively deal with the curve fitting. An improved method and its indexes were evaluated, using effectiveness and unbiasedness as the assessment criteria, while scoring and percentage methods were chosen to comprehensively assess the statistical results. Compared with FWOCM, the results showed greater effectiveness and unbiasedness in the improved method.     

基于Sato模型的内蒙古东北部地区尾波Q值

基于Sato模型,采用2016年3月至2018年6月内蒙古东北部及临近地区发生的526次地震事件,挑选M_L≥2.0、记录清晰且信噪比较高的102次地震事件,拟合得到内蒙古东北部地区尾波Q值,得到Q_C(f)=(64.74±29.09)f^{(0.8925±0.0765});Q值与依赖指数η成反比,且该区北部Q值偏高,南部Q值偏低,可能与地质构造及地震活动性有关。     

超高层建筑设计地震动参数的研究

本文以沈阳市世纪华丰文化广场工程场地为例,在地震危险性分析的基础上,进行土层地震反应分析,对超高层建筑设计地震动参数的确定进行研究,为抗震设计提供可靠依据。     

Thresholds of geographic environmental elements in sediment yield of drainage basins

Threshold of environmental elements in drainage basin sediment yield refers to, under effect of climate, underlying surface and human activity, a turning point of abrupt changes in drainage sediment yield related to environmental element characteristics. Previous studies on threshold of sediment yield of relevant drainage basins were mainly concentrated on impact of natural zones with a few researches on impact of other environmental elements. Particularly studies on compound environmental element threshold in drainage basin sediment yield remain blank today. Studies indicate that sediment yield in drainage basins is affected by compound interactions and complex actions. Based on single element analysis, the present paper gives quantitatively compound threshold of environmental elements affecting sediment yield of the drainage basin between Hekouzhen and Tongguan in the middle Yellow River by the method of multi-variant, polynomial formula regression analysis.     

基于形态学灰度重构的乳腺微钙化点提取

针对乳腺X线摄片,提出了一种计算机辅助检测乳腺微钙化点的方法:首先利用灰度形态重构完成穹顶提取,除去乳腺背景结构同时又能很好地保留微钙化点;其次运用拉普拉斯算子在空间域内对图像进行锐化以增强微钙化点;然后在频率域内利用巴特沃思高通滤波器对图像进行高通滤波;最后利用二维最大熵阈值分割对图像二值化,从而检测出微钙化点并在图像上标识出来。计算机辅助诊断的方法不仅避免了医生因大量阅片引起疲劳而造成误诊,起到了协助医生诊断的作用,而且提高了诊断的效率和准确率。     

对豫西南两次历史地震的甄别与复核

历史地震调查是核电厂和大型水利枢纽等重大工程建设场地地震安全性评价的重要内容之一。近来，本文作者在参与完成河南核电项目选址阶段地震安全性评价任务的过程中，曾对豫西南地区的历史地震进行过调查。兹将其中两次较为重要的历史地震的甄别与复核结果介绍如下，希望对相关的研究工作和今后修编地震目录有所裨益。     

Synthesis of accelerations of the 1976 Tangshan earthquake(M_S 7.8)in near-and far-field by using semi-empirical method

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