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A Study of the Effect of Soil Improvement Based on the Numerical Site Response Analysis of Natural Ground in Babol City

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Open Journal of Civil Engineering 2016年第2期6卷 163-178页

作者： Asskar Janalizadechoobbasti Mehran Naghizadeh rokni aida talebi Civil Engineering Babol University of Technology Babol Iran

A series of numerical calculations have been performed to investigate the effect of soil improvement on seismic site response. Seismic site response analyses were also performed using data collected from a study area in Babol city. The improved site is a composite ground and has more or less different mechanical properties than the natural ground. In this research, the influence of the elastic modulus of the pile, the pile distance ratio, ground motion input, distance to fault rupture, and PGA of the earthquakes on seismic response characteristics are especially investigated. The results reveal that the values of the PGA and amplification factor on the surface of the natural and improved grounds depend strongly on the fundamental period of the site, the predominant period, and the intensity of the ground motion input. The acceleration response spectra also are affected by the characteristics of ground motion input and soil layers. Changing the pile distance ratio doesn’t have a significant effect on the seismic response of the site.

关键词： Seismic Site Response Amplification Factor Acceleration Response Spectra Soil Improvement Pile Numerical Analysis Babol

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Coinfection of the secondary symbionts,Hamiltonella defensa and Arsenophonus *** to the performance of the major aphid pest,Aphis gossypii(Hemiptera:Aphididae)

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Insect Science 2020年第1期27卷 86-98页

作者： aida Ayoubi Ali Asghar talebi Yaghoub Fathipour Mohammad Mehrabadi Faculty of Agriculture Department of EntomologyTarbiat Modares UniversityTehranIran

Bacterial endosymbionts play important roles in ecological traits of *** this study,we characterize the bacterial endosymbionts of *** collected in Karaj,Iran and their role in the performance of the *** results indicated that beside Buchnera aphidicola,***,also harbors both Hamiltonella defensa and Arsenophonus *** PCR(qPCR)results revealed that the populations of the endosymbionts increased throughout nymphal development up to adult emergence;thereafter,populations of Buchnera and Arsenophonus were diminished while the density of *** constantly *** reduction caused prolonged development and no progeny ***,secondary symbiont reduction led to reduction of the total life span and intrinsic rate of natural increase as well as appearance of the deformed dead offspring in comparison with the control *** of the secondary symbionts did not affect parasitism rate of the aphid by the parasitic wasp Aphidius *** these findings showed that *** and Arsenophonus contributed to the fitness of *** by enhancing its performance,but not through parasitoid resistance.

关键词： Arsenophonus Buchnera aphidicola cotton aphid Hamiltonella defensa parasitism resistance

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