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Does Glacial-Interglacial Transition Affect Sediment Accumulation in Monsoon-Dominated Regions?

Acta Geologica Sinica(English Edition) 2017年第3期91卷 1079-1094页

作者： Dharmendra Pratap SINGH Rajeev SARASWAT Dinesh K.NAIK Micropaleontology Laboratory Geological Oceanography DivisionNational Institute of Oceanography

The spatio-temporal changes in sedimentation rate along the continental margin of the monsoon-dominated eastern Arabian Sea during the last 24 kyr have been estimated from a compilation of 58 radiocarbon dated cores, in order to understand the effect of glacial-interglacial variation on sedimentation. The sedimentation rate has been computed for four-time slices, viz. the last glacial maximum, glacial-interglacial transition, early Holocene and late Holocene. We report that the average sedimentation rate in the slope to the abyssal region of the entire eastern Arabian Sea, although higher during the Holocene as compared with that during the last glacial maximum and glacial-interglacial transition, does not significantly vary during all four-time intervals. The sedimentation rate during any particular time interval, however, varies from core to core, thus indicating zonal changes. We report four zones of relatively high sedimentation rate, viz. the northeastern Arabian Sea, the region off the Gulf of Khambhat, the region off Goa and Mangalore, and off the southern tip of India. We suggest that a complex interaction of land-ocean-atmospheric processes controlled sedimentation rate in the eastern Arabian Sea during the last 24 kyr in such a way that the average sedimentation rate does not vary significantly, even during highly contrasting climatic conditions.

关键词： Sedimentation rate monsoon glacial Holocene Arabian Sea

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Structural,optical and antimicrobial properties of pure and Agdoped ZnO nanostructures

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Journal of Semiconductors 2022年第3期43卷 78-86页

作者： Sagar Vikal Yogendra K.Gautam Anit K.Ambedkar Durvesh Gautam Jyoti singh dharmendra pratap Ashwani Kumar Sanjay Kumar Meenal Gupta Beer Pal singh Smart Materials and Sensor Laboratory Department of PhysicsCh.Charan Singh UniversityMeerutUttar Pradesh 250004India Department of Genetics and Plant Breeding Ch.Charan Singh UniversityMeerutUttar Pradesh 250004India Nanoscience Laboratory Institute Instrumentation CentreIIT RoorkeeRoorkee 247667India Department of Physics University of RajasthanJaipur 302004India Department of Physics SBSRSharda UniversityGreater NoidaUttar PradeshIndia

In the present work,zinc oxide(ZnO)and silver(Ag)doped ZnO nanostructures are synthesized using a hydrothermal method.Structural quality of the products is attested using X-ray diffraction,which confirms the hexagonal wurtzite struc-ture of pure ZnO and Ag-doped ZnO nanostructures.XRD further confirms the crystallite orientation along the c-axis,(101)plane.The field emission scanning electron microscope study reveals the change in shape of the synthesized ZnO particles from hexagonal nanoparticles to needle-shaped nanostructures for 3 wt%Ag-doped ZnO.The optical band gaps and lattice strain of nanostructures is increased significantly with the increase of doping concentration of Ag in ZnO nanostructure.The anti-microbial activity of synthesized nanostructures has been evaluated against the gram-positive human pathogenic bacteria,Staphylococcus aureus via an agarose gel diffusion test.The maximum value of zone of inhibition(22 mm)is achieved for 3 wt%Ag-doped ZnO nanostructure and it clearly demonstrates the remarkable antibacterial activity.

关键词： zinc oxide silver hydrothermal FESEM antimicrobial activity Staphylococcus

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