共查询到20条相似文献,搜索用时 78 毫秒
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江凡 《福建工程学院学报》2013,11(1):14-18,57
利用高精度交错网格有限差分技术模拟起伏地表条件下的瑞雷波全波场正演,通过坐标变换的方式实现起伏地表自由边界条件.与一个已知模型结果对比,验证该算法的可行性与正确性,并通过在一个地表起伏的均匀介质中瑞雷波的模拟,结果说明了该方法的适应性.两个模型的模拟结果均表明,即使是地下室均一的介质,但由于地表起伏的存在不可避免地会产生波型的转换与能量的再分配,瑞雷波波场必然受到一定的影响. 相似文献
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泉州某公路路基检测主要采用了多道瞬态瑞雷波法.为减少人为误差工,采用了相移法以及线性反演.与钻孔资料对比表明,效果令人满意;相移法及线性反演,减小了人为误差,处理过程稳定,计算速度相比人机交互方式有了很大的提高. 相似文献
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席超强王伟周文龙 《淮南职业技术学院学报》2017,(1):22-26
多道瞬态面波法(MASW)获取地层剪切波速度方便快捷,目前已广泛应用在工程勘探领域,特别是在复杂地形条件下的应用逐步增多;针对复杂地形条件下,数据采集至关重要,其中排列参数选择是一个重要因素,以双层凸起地质模型为例,通过对不同偏移距和道间距的排列系统进行高精度有限差分数值模拟研究;对比分析数据频率谱,讨论不同偏移距与道间距对瑞雷波频散分辨率特征的影响,为现场数据采集提供理论指导;结果表明:在一定数量的通道数和横向分辨率允许的情况下,大道间距是优选,偏移距尽量大以避免近场效应。 相似文献
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总结赋存环境对岩土体弹性波波速敏感性研究成果,阐明了赋存环境对波速的影响特征,提高了岩土体波速资料在应用中的科学性。 相似文献
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TSP地震波波速与隧道围岩类别关系探讨 总被引:1,自引:0,他引:1
介绍了TSP超前地质预报技术的基本原理和过程,提出了在TSP所测的波速预测隧道围岩类别时存在着预测结果偏大的问题,探讨了TSP地震波波速与隧道围岩类别关系。 相似文献
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刘刚 《商丘师范学院学报》2010,26(6):37-39
利用假设待定法求出了非线性Klein-Gordon方程的具有Jacobi椭圆函数分式形式且渐近值不为零的精确周期波解,并分别得到了它们存在且有界的条件,揭示了行波波速的改变对周期波解波形变化及周期大小的影响. 相似文献
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高峰 《衡阳师范学院学报》1993,(3)
关于德布洛意(De Broglie)波波速问题在许多有关量子力学的书中都有论述,但对波速佯谬却很少分析。上海电视大学金山分校莫之灏同志曾著文“德布洛意波波速佯谬辩析”,发表于《物理通报》一九九○年第五期。但该文中所指佯谬并非唯一,且分析欠透彻。本文全面分析这一佯谬,并给出确切的回答,最后给出德布洛意波的形状及与实物粒子间的关系。 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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唐芳 《读与写:教育教学刊》2008,5(6)
During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context. 相似文献