An ML scale for Eastern Dharwar Craton and adjoining regions     

Sharma  Aman  Vashisth  Divakar  Naresh  B.  Suresh  G.  Raju  P. Solomon  Raghavan  R. Vijaya  Srinagesh  D. 《Journal of Seismology》2021,25(5):1251-1263

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Assessment of Aphid Infestation in Mustard by Hyperspectral Remote Sensing     

Jitendra Kumar  Ananta Vashisth  V. K. Sehgal  V. K. Gupta 《Journal of the Indian Society of Remote Sensing》2013,41(1):83-90

Field experiment was conducted during 2009–10 and 2010–11 rabi season at research farm of IARI, New Delhi for assessing the aphid infestation in mustard. In aphid infested plant the LAI was 67 to 94% lower than healthy plant. Chlorophyll concentration decreased to 50% in infested plant as compared to healthy plant. Infestation was more severe in late sown crop and due to aphid infestation the percentage oil content and yield was reduced significantly. The spectral reflectance of aphid infested canopy and healthy canopy taken in the laboratory had significant difference in NIR region. In the visible region, the reflectance peak occurred in healthy canopy at around 550–560 nm while this peak was lower by 31% in the aphid infested canopy. The reflectance for healthy crop was found to be more in visible as well as NIR region as compared to aphid infested canopy. The most significant spectral bands for the aphid infestation in mustard are in visible (550–560 nm) and near infrared regions (700–1250 nm and 1950–2450 nm). The different level of aphid infestation can be identified in 1950–2450 nm spectral regions. Spectral indices viz NDVI, RVI, AI and SIPI had significant correlation with aphid infestation. Hence these indices could be used for identifying aphid infestation in mustard.  相似文献   

Quasi-static Planar Deformation in a Medium Composed of Elastic and Thermoelastic Solid Half Spaces Due to Seismic Sources in an Elastic Solid     

Anil K. Vashisth  Kavita Rani  Kuldip Singh 《Acta Geophysica》2015,63(3):605-633

A two-dimensional problem of quasi static deformation of a medium consisting of an elastic half space in welded contact with thermoelastic half space, caused due to seismic sources, is studied. Source is considered to be in the elastic half space. The basic equations, governed by the coupled theory of thermoelasticity, are used to model for thermoelastic half space. The analytical expressions for displacements, strain and stresses in the two half spaces are obtained first for line source and then for dip slip fault. The results for two particular cases, adiabatic conditions and isothermal conditions, are also obtained. Numerical results for displacements, stresses and temperature distribution have also been computed and are shown.  相似文献   

Reflection and transmission of elastic waves at a loosely bonded interface between an elastic solid and liquid-saturated porous solid     

A. K. Vashisth  M. D. Sharma  M. L. Gogna 《Geophysical Journal International》1991,105(3):601-617

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