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Thermal cycling behavior of alumina-graphite brazed joints in electron tube applications

Transactions of Nonferrous Metals Society of China 2014年第6期24卷 1666-1673页

作者： Nadadulal DANDAPAT Sumana GHOSH kalyan sundar pal Someswar DATTA Bichitra Kumar GUHA Central Glass&Ceramic Research Institute Council of Scientific and Industrial Research Department of Physics Bengal Engineering&Science University Institute for Plasma Research

Alumina was joined with graphite by active metal brazing technique at 895,900,905,and 910 ℃ for 10 min in vacuum of0.67 mPa using Ti-Cu-Ag（68.8Ag-26.7Cu-4.5Ti;mass fraction,%） as filler *** brazed samples were thermal cycled between 30 and 600 ℃ and characterized.X-ray diffraction results show strong reaction between titanium and carbon as well as titanium and *** electron microscopy and helium leak tests show that the initial and thermal cycled brazed samples are devoid of cracks or anv other defects and hermeticity in *** strength of the joints is found to be satisfactory.

关键词： brazed joints thermal cycling brazing strength hermeticity

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Pollen Morphology of Indian Species of Saraca L.(Leguminosae)-A Threatened and Legendary Medicinal Tree

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Phyton-International Journal of Experimental Botany 2019年第3期88卷 295-315页

作者： Sujit Sil Tanmoy Mallick Tuhin pal Animesh Mondal kalyan Kumar De Asok Ghosh Postgraduate Department of Botany Hooghly Muhammad Mohsin College(Estd.1836)Chinsurah712101HooghlyWest BengalIndia UGC-CAS Department of Botany Taxonomy of Angiosperms and Biosystematics LaboratoryUniversity of BurdwanGolapbagBurdwan713104West BengalIndia

The genus Saraca L.(Leguminosae)is a universal panacea in herbal *** present study investigates the comparative pollen morphology of four species of Saraca ***(Roxb.)de Wilde,***(Jack)Miq.,*** L.,and *** Cantley ex Prain growing in India to reveal differences of their pollen structures to aid taxonomic and evolutionary *** detailed morphology and surface structure of pollen grains were studied and described using light microscopy and scanning electron *** pollen grains of Saraca showed isopolar,para-syncolporate,tricolporate,with radially symmetric,prolate and prolate-spheroidal *** surface of pollen of *** is rugulate with large lirae but in ***,the surface is micro-rugulate to vermiculate with relatively thin lirae and that of *** is indistinct as the psilate surface with a frequent protuberance and fewer perforations were observed along with the gemmae like *** ornamentation helped to separate *** and *** thickness varies from 3-4μ*** of protuberance and exine thickness varies among individuals of the species spread over different *** work also provides a unique palynological identity and interrelationship of these four species based on cluster analysis taking 23 pollen characters with the help of statistical method like the plotting of ternary *** plots also helped to calculate the level of plasticity of each character in the intra-and inter-specific level.

关键词： Cluster analysis palynology SEM study surface ornamentation ternary graph

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