ON THE NONLINEAR WAVES IN A DEVELOPING PROCESS PART 1. THE DERIVATION OF THE GOVERNING EQUATIONS

Until now most of the nonlinear wave theories are confined to expound the nonlinear properties relative to a stationary wave train and inclusive of three dimensional instabilities, bifurcation into a new steady solution, statistical properties of random wave field and so on. Under the wind blowing over the sea the atmosphere near the sea surface will continuously transmit energy into the sea waves due to the resonant and coupling mechanisms. Wind-generated waves are essentially a developing process associated with the rate of energy     

THE ROLE OF VOLCANIC AND VOLCANO-SEDIMENTARY PROCESSES IN THE FORMATION OF CERTAIN MINERAL DEPOSITS OF CHINA

The significance of the volcanic and the volcano-sedimentary processes inthe formation of mineral deposits has, as a rule, not yet been sufficiently recog-nized by geologists. Intensive studies carried out recently by the Soviet geologistsin the Altai and Ural regions have furnished more and more informations     

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     

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.