水平薄层包围的流体井孔中声波场的数值模拟

针对声波测井薄层探测的需要,用半解析方法求解了地层为水平多层介质时柱状井孔内脉冲点源激发的声场。通过模式解求出了层间的广义反射矩阵,使得各水平区域的场用层间的广义反射矩阵表出,最后给出了井外为。层介质的形式解,并在井外为三层介质出现一薄层时,对接收器纵向位置位于层下、层间和层上记录的波形进行了数值模拟,得到了首波波至的正确显示。讨论了薄层对波至与幅度的影响。     

碱性溶液中纳米钯膜电极表面CO、CN-吸附的红外反射光谱研究

以原位ＦＴＩＲ反射光谱研究碱性介质中ＣＯ和ＣＮ＾－在纳米Ｐｄ膜电极上的吸附和共吸附,进一步揭示了纳米薄膜材料的异常红外效应和ＣＯ与ＣＮ＾－共吸附时的相互作用规律。     

彗木相撞预报 *

以太阳系天体动力学数值模型为基础,探研方法理论,编制软件,向国内外发出了多次Shoemaker-Levy 9号彗星与木星相撞预报,预报结果和实际基本吻合.阐述预报的方法理论,并将预报的碰撞时间和国际确认的实际碰撞时间予以比较分析.     

A New Method for Calculation of Single Seismic Phase of Cylindrically Multilayered Media Including Liquid Interlayer

A new method based on generalized reflection and transmission （R/T） coefficients method is proposed to calculate the single seismic phase （SSP） of cylindrically multilayered media including liquid interlayer. The use of normalization factors and normalized Lamé coefficients makes the algorithm stable numerically. Using the modified R/T matrices, we derive the iterative expressions of generalized R/T matrices, and by using the iterative relation we determine the SSP of each interface and the full waveforms. To show the superiority of this new approach for investigating of reflection and transmission properties of cylindrically multilayered media, we simulate the full waveforms and SSPs of cased hole model with annulus I （casing-cement interface） channelling （or, cross-flow）. The generalized reflection coefficient spectra and SSPs of interfaces obtained show the propagation mechanism of each component of full waveform clearly.     

防火涂料防火的基本原理

从阻隔引起燃烧发生的三个基本条件．消除它们之间的相互作用这方面，揭示防火涂料防火的基本原理。     

Pt及其修饰电极上乙醇吸附和氧化的CV和EQCM研究

运用电化学循环伏安和石英晶体微天平研究了乙醇在Pt电极和以Sb,S吸附原子修饰的Pt(Pt/Sbad和Pt/Sad)电极上的吸附和氧化过程。结果表明乙醇的氧化与电极表面氧物种有着极其密切的关系。Pt电极表面Sb吸附原子能在较低的电位下吸附氧,可显著提高乙醇电催化氧化活性。相反,Pt电极表面S吸附原子的氧化会消耗表面氧物种,抑制了乙醇的电氧化。本文从表面质量变化提供了吸附原子电催化作用的新数据。     

孔隙介质中快纵波的衰减特性和动力协调现象

依据Biot理论并采用前人的骨架模量孔隙度关系,计算了弹性波在孔隙介质中的衰减曲线,发现快纵波存在零衰减点.为解释这种现象,分析了孔隙流体相对于骨架运动的特点.结果表明,存在快纵波动力协调介质,快纵波在这种介质中传播时,流体和骨架之间无宏观相对位移,因此无论频率多高,流体粘滞系数多大,快纵波都不衰减.一个引申的结论是,在动力协调的渗透性孔隙介质中,即使存在双电层,快纵波也不产生流动电势.     

The acoustoelastic effect on Rayleigh waves in elastic--plastic deformed layered rocks

On the basis of the acoustoelastic theory for elastic--plastic materials, the influence of statically deformed states including both the elastic and plastic deformations induced by applied uniaxial stresses on the Rayleigh wave in layered rocks is investigated by using a transfer matrix method. The acoustoelastic effects of elastic--plastic strains in rocks caused by static deformations, are discussed in detail. The Rayleigh-type and Sezawa modes exhibit similar trends in acoustoelastic effect: the acoustoelastic effect increasing rapidly with the frequency-thickness product and the phase velocity change approaching a constant value for thick layer and high frequency limit. Elastic--plastic deformations in the Castlegate layered rock obviously modify the phase velocity of the Rayleigh wave and the cutoff points for the Sezawa modes. The investigation may be useful for seismic exploration, geotechnical engineering and ultrasonic detection.     

卫星电视图像传输质量分析

本文综合影响卫星电视图像传输质量的主要因素的数学关系,应用作者研究的“卫星电视接收网的系统分析”软件成果,给出收看效果,接收仰角,优选接收系统,预测接收站的图像等级与取样实测结果.     

让四季兰再度火起来的"祸首":四季兰"圣火"

2003年,刊登在《兰花宝典》兰花专业杂志第一期封面的一幅照片,吸引着兰界朋友的眼球。这是一幅四季兰蝶花图片,为一箭三花之正格三星蝶,全株花朵朝天绽放,捧瓣以完全蝶化与舌一致且色块大而鲜艳呈火红色,底板为嫩鹅黄色,瓣沿