山东苍山5.2级地震定点形变异常的识别

利用长趋势异常、矢量曲线、γ因子等方法对泰安、郯城、徐州３个台的７套倾斜仪进行了异常识别，得出泰安ＳＱ—７０石英倾斜仪、徐州ＳＱ—７０石英倾斜仪反映了山东苍山５．２级地震异常信息的结论。     

在以色列利用弱运动测量估算场地响应

引言场地响应似乎是在地震危险性评价及其次生灾害中首先要考虑的。研究最多的可能是1985年的墨西哥城地震(Stagh et al., 1988)。然而,最近的加利福尼亚(洛马普列塔,1989和诺思里奇,1994)和日本(神户,1995)地震大灾难使人们清醒地意     

华北4次中、强地震前震源区及其附近应力场的变化

使用小震机制解资料 ,分析了 1975年海城 7 3级和 1976年唐山 7 8级强震及 1983年菏泽 5 9级和 1995年苍山 5 2级中强震前 ,震源区及其周围不同构造部位应力场的时、空变化 ,证实震前震源区附近应力场曾有某些异常改变 ,如唐山强震前震源区周围出现长达 4a多的小震机制解主应力轴一致性取向的现象 ,菏泽地震前小震机制解P轴“集中—转向” ,苍山地震前P轴偏转且一致性增强。同时还发现 ,唐山地震前应力场异常变化开始时间可能早于 1972年 ;震源区内的陡河台与源外区的昌黎台小震综合机制解反映出震前的受力差异 ;震源断层附近不同应力区内震源机制解和地震活动有时空动态差异。这些现象一定程度上提供了不同构造条件和应力背景下 ,中、强震前震源区不同构造部位力学状态的改变或地震孕育过程的信息 ,对研究不同地震的孕震过程及差异有一定意义。     

生石灰与粉煤灰桩加固软土地基的微观分析

采用压汞试验和扫描的电镜的手段，分析了生石灰与粉煤灰桩加固软土地基前后土的微观结构和孔隙特征的变化，发现加固后特大孔隙和大孔隙减少，小孔隙和微孔隙增加，不同的土质存在着不同的孔隙阈界值，且孔隙阈界值在加固后明显降低，对加固前后不同土的微观结构进行分类，从微观上解释了生石灰与粉煤灰桩加固软土的机理。     

集成GPS定位及导航系统的研制

本文介绍几种Ｐｕｌｓｅａｒｃｈ公司开发的高精度定位和导航系统产品，包括广域差分ＧＰＳ系统，地震探测系统和精密耕作系统。对每一产品介绍其系统结构，重点是集成方式及其性能。     

日本西南层状燧石层序与碳酸盐层序δ^13C偏差之间的对比及其对P／…

在日本西南地区层状燧石层序中，用Ｉｓｈｉｇａ图解研究了Ｐ／Ｔ界线之下的放射虫生产率变化。根据燧石层的厚度变化作图，两个露头上的图显示了地层变化的共性，表明该图是层状燧石层序对比的有效工具。生产率的共性变化还与浅海碳酸盐层序δ＾１３Ｃ偏差变化能完全对比，Ｐ／Ｔ界线之下的层状燧石记录了大洋浅层带曾明显发生过绝灭事件。根据Ｉｓｈｉｇａ图、层状燧石层序的岩性变化和δ＾１３Ｃ曲线，Ｐ／Ｔ集群绝灭被划分为３个     

Absolute absorption coefficient of C6H2 in the mid-UV range at low temperature; implications for the interpretation of Titan atmospheric spectra

The interpretation of mid-UV albedo spectra of planetary atmospheres, especially that of Titan, is the main goal of the SIPAT (Spectroscopie uv d'Interet Prebiologique dans l'Atmosphere de Titan) research program. This laboratory experiment has been developed in order to systematically determine the absorption coefficients of molecular compounds which are potential absorbers of scattered sunlight in planetary atmospheres, with high spectral resolution, and at various temperatures below room temperature. From photochemical modelling and experimental simulations, we may expect triacetylene (C6H2) to be present in the atmosphere of Titan, even though it has not yet been detected. We present here the first determination of the absolute absorption coefficient of that compound in the 200-300 nm range and at two temperatures (296 K and 233 K). The temperature dependence of the C6H2 absorption coefficient in that wavelength range is compared to that previously observed in the case of cyanoacetylene (HC3N). We then discuss the implications of the present results for the interpretation of Titan UV spectra, where it appears that large uncertainities can be introduced either by the presence of trace impurities in laboratory samples or by the variations of absorption coefficients with temperature.     

Cloning and sequence analysis of the self-fertilizing fish Rivulus marmoratus immediate early gene c-fos

We have cloned the proto-oncogene c-fos from a self-fertilizing fish Rivulus marmoratus (Cyprinodontiformes, Rivulidae) after screening of R. marmoratus lambdaGEM-11 genomic DNA library, and sequenced over 12 kb including all exons, introns and the promoter region. The R. marmoratus c-fos gene consisted of one noncoding exon and four exons with high similarity to those of fugu and mammals. We sequenced approximately 7 kb of the R. marmoratus c-fos gene promoter region to gain a better understanding of the molecular anatomy of the immediate response of this gene upon cellular damage. In the promoter region, R. marmoratus c-fos gene has seven xenobiotic response elements (XREs) and eight metal response elements (MREs) as well as two estradiol (E2), 4 NFkappaB, 2 CarG, 2 prolactin (PRL) motifs and one pit1 site, while the 3'-UTR of this gene contains the estrogen response element (ERE). The seven XRE and eight MRE motifs raise the possibility of its regulation by exposure to environmental pollutants. In this paper, we discuss the gene structure of R. marmoratus c-fos gene and compare its promoter region with those of other organisms' c-fos genes. We propose its potential use in ecotoxicology.