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Summary The stability properties of the nongeostrophic disturbances are studied in a barotropic zonal current. The growth rate of the nongeostrophic disturbances is increased and the instability is generally shifted towards shorter wavelengths. Even in the structure of the nongeostrophic disturbances large differences are found as compared to geostrophic disturbances.On leave from Physical Research Laboratory, Ahmedabad, India. 相似文献
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M. Rama Rao A. Sreerama Rao R. Dayakara Babu 《Geotechnical and Geological Engineering》2008,26(2):189-197
Expansive clays swell and shrink seasonally when subjected to changes in the moisture regime causing substantial distress
to the structures built in them. Techniques like sand cushion and cohesive non-swelling soil (CNS) layer have been tried to
arrest heave and consequent damages to structures. Sand cushion has been proved to be counter-productive. Studies have indicated
that even though CNS layer was effective initially, it became less effective after the first cycle of swelling and shrinkage.
Research carried out by the authors, using cement-stabilized fly ash as a cushioning material, has shown that it was quite
effective in arresting heave. Fly ash cushion, stabilized with 10% cement with thickness equal to that of the expansive soil
bed reduces heave by about 75% in the first instance. With subsequent swell-shrink cycles, the performance further improves,
unlike in the case of a black cotton soil provided with a CNS cushion. At the end of fourth cycle of swelling, the reduction
in the amount of heave is as high as 99.1%. 相似文献
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Ajay Kumar Sreerama Rajaram Chenna Mishra Shashank Pradeep Kumar Ramancharla Karnath Anoop 《Natural Hazards》2017,85(3):1851-1875
Natural Hazards - Methods capable of assessing the vulnerability of houses for future earthquakes are of fundamental importance for the safety and development of an area. As the detailed assessment... 相似文献
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