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Synthesis and characterization of the nanostructured solid solution with extended solubility of graphite in nickel by mechanical alloying

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International Journal of Minerals,Metallurgy and Materials 2019年第8期26卷 1031-1037页

作者： Nitika Kundan biswajit parida Anup Kumar Keshri Prathvi Raj Soni Department of Metallurgical and Materials Engineering Malaviya National Institute of TechnologyJaipurRajasthan 302017India Department of Materials Science and Engineering Indian Institute of Technology PatnaBihar 801106India

In the present work,mechanical alloying of a powder mixture of nickel and graphite(up to 15wt%)was carried out in an attrition mill under a nitrogen *** as-milled powders were characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD),and transmission electron microscopy(TEM).The 15wt%graphite dissolved into the nickel(exceeding the negligible solid solubility in the nickel–carbon system),thereby forming a supersaturated solid solution of graphite in a nickel *** dissolved graphite occupied interstitial positions along the dislocation edges and at the grain-boundary regions.A three-step graphite dissolution mechanism has been *** associated changes in the nickel lattice,such as changes in the crystallite size(62 to 43 nm),lattice strain(0.12%to 0.3%),and lattice parameter(0.3533 to 0.3586 nm),which led to the formation of the supersaturated solid solution,were also evaluated and discussed.

关键词： Ni-C system mechanical alloying supersaturated solid solution nanostructured powder

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Habitat heterogeneity influences avian feeding guild composition in urban landscapes:evidence from Bhubaneswar,India

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Ecological Processes 2021年第1期10卷 418-427页

作者： Bibhu Prasad Panda B.Anjan Kumar Prusty biswajit Panda Abanti Pradhan Siba Prasad parida Environmental Sciences Department of Chemistry and BBRCITERSiksha‘O’Anusandhan(Deemed to be University)BhubaneswarOdishaIndia Department of Natural Resources Management and Geoinformatics Khallikote UniversityBerhampurOdishaIndia Department of Stem Cell Facility All India Institute of Medical SciencesNew DelhiIndia Department of Zoology School of Applied SciencesCenturion University of Technology and ManagementBhubaneswarOdishaIndia.

Background:Habitat heterogeneity clearly distinguished in terms of availability of food and habitat resources and landscape features(natural or human-modified)play a crucial role in the avian species composition and population *** examine this,a study was carried out in Bhubaneswar,India,to understand the ecological niche distinction in birds based on habitat *** sampling was conducted in 30 sampling sites covering six different habitat types in a predominantly urban landscape of Bhubaneswar for understanding the ecological niche in *** birds were classified into 11 types of foraging ***:The insectivorous guild had the highest bird species richness(181 species)and the omnivorous guild had the lowest(11 species).The piscivorous guild and wetland habitat had the strongest linkage,followed by the insectivorous guild and agricultural *** frugivorous guild was significantly correlated with forest habitats(r=0.386,p<0.01)and park and garden habitats(r=0.281,p<0.01).This urban area hosted a higher number of bird species in certain habitat types,viz.,agricultural lands(52%,115 species)and forest patches(50%,111 species).Conclusion:The present study highlights the importance of agricultural lands,forest patches,parks and gardens,and wetlands inside the cityscape for supporting *** is therefore suggested that such habitats should be conserved inside an urban area to protect native ***,the city development plan must invariably include strategies for conserving the forest patches inside the urban *** must be taken to restrain the degradation of agricultural lands and reduce their utilization for non-agricultural purposes,which will help in further reducing the bird population decline in the urban landscape.

关键词： Bird species richness Community structure Feeding guild Habitat characteristics Urban area

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