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体。晚期,骨质修复占优势,即骨质增生硬化,骨桥形成,最后可产生骨性融合。     

从地洼成矿作用看中国某些优质锰矿的成因与远景

研究发现中国某些优质锰矿,属复成矿床,它们都是地洼成矿作用的产物。福建连城锰矿就是典型实例,类似矿床特别是复成风化锰矿,还见于闽西南-粤东北及湖南。滇东南一些锰矿,例如著名的斗南锰矿与白显锰矿的成因,也可能与地洼成矿作用有一定联系。分析对比了一些优质复成锰矿和一些较贫的复成锰矿的成矿地质条件。从地洼成矿作用可以看出中国某些优质锰矿的成因与远景。提出在中国东南地洼区、南北地洼区南端及云贵地洼区某些地方,寻找优质复成风化锰矿与复成菱锰矿—硫锰矿矿床是较有希望的。     

福州地区的Q结构和它的横向不均匀性

本文利用人工爆破地震资料,在频率域中,用波组频谱比方法计算了福州地区的Q结构,结果发现:该区中地壳低速层Q值明显偏低,仅为40——80,且存在横向变化,地壳上部和下部Q均为200左右;福州盆地与永泰——梧桐地段地壳平均Q也明显偏低,且福州盆地中部Q仅120—150,为全区最低值,低Q区与温泉分布和断裂位置有良好的对应关系。     

Atmospheric sulfur deposition and streamwater quality in Finland

The correlation between sulfate concentrations in Finnish headwater streams and atmospheric sulfate deposition has been studied by using data from the streamwater chemistry in August–September 1990 and computed S deposition from the anthropogenic emissions. The sulfate concentrations and acidity in water are interpolated and smoothed into a deposition model grid. These data are compared with geological and pedogeochemical (glacial till) background information. The areas where the streamwater SO₄ concentrations are mainly controlled by either anthropogenic S deposition or sulfur in till is estimated by applying the fuzzy Gustafsson-Kessel algorithm, which provides a soft clustering suitable for overlapping control factors. Residual areas can be well explained by the SO₄-rich Littorina clay deposits. The higher overall background SO₄ concentrations in streams in south Finland compared with central and northern Finland are an indisputable consequence of the heavier S deposition load in the south. However, anthropogenic sulfur deposition has a clear correlation with the sulfates in streamwaters only in northeastern Lapland impacted by the large industrial emissions in the Kola Peninsula. The secondary sulfide and sulfate minerals of marine Littorina sediments are dominating sources in the broad coastal belts, as are the primary sulfide minerals locally in the Pori-Vammala area, at the eastern end of the main sulfide ore belt between Lake Ladoga and the Gulf of Bothnia, in the Outokumpu area, and in the Peräpohja and central Lapland schist belts. Consequently, in addition to the anthropogenic deposition, there are natural sources of sulfur which cause acidity of streamwaters.     

上海夏灌水现状及其开发利用

本文对上海市区地下含水层中滞留的夏灌余水的现状进行了调查分析与评价,对其开发利用的可行性作了论证,以助于今后更好地开展“夏灌冬用”工作。     

四川省芦山—宝兴地区花岗石石材产出地质特征及其品质

本文扼要阐明四川省芦山－宝兴地区花岗石石材产出地质特征的基础上，重点讨论花岗石石材的品种、规模和质量。     

长春市深部地下水赋存规律之我见

长春市北西或北北西向扭性断裂或断裂带是客观存在，它对长春市深部地下水循环与循存起控制作用，是深部基岩裂隙水的主要导水通道，且大都为富水带。原北东向压扭性断裂或断裂带起阻水作用，二者相得益彰。笔者于长春北郊贫水区，利用这一新理论，在水文地质调查基础上，结合多种水文物探手段布孔凿井，打出一口水量丰富的优质矿泉水井，进而验证了北西向富水说，了箕市深部地下水赋存规律的新认识，此说不但对长春市供水有实际意义     

临涣矿区水化学特征及在矿井水源判别中的意义

通过分析、比较临涣矿区三个地下水子系统的水文地球化学特征得出，这三个子系统在水溶标型发及少、微量元素的含量上无明显差别，表明各子系统间存在水力联系，而环境同位素氘和＾１８Ｏ分析则是解决矿井水来源判别的有效方法。     

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。     

Coda waves: A review

The analysis and interpretation of coda waves have received increasing attention since the early seventies. In the past few years interest in this subject has spread worldwide, and the study of high-frequency seismic coda waves has become a very important seismological topic. As a conclusion of the studies accomplished in this time, coda waves are considered the result of scattering processes caused by heterogeneities acting on seismic waves.P andS waves play a particularly important role in this interaction. The process introduces an attenuation which, added to the intrinsic absorption, gives the observed apparent attenuation. Therefore, coda waves constitute a thumbprint left by the heterogeneities on the seismograms. Coda waves offer decisive information about the mechanism of how scattering and attenuation take place. This review describes coda waves in detail, and summarizes the work done in this subject to 1986. The relation between coda waves and attenuation in the context of research on seismic scattering problems is stressed. Particular attention has been given to the application of coda waves to estimate source and medium parameters. The state-of-the-art of the temporal variations of coda wave shape, and the possible use of these variations as an earthquake precursor also are presented. Care has been taken to introduce the statistical models used to deal with the heterogeneities responsible for scattering.