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Astronomy Reports - We construct a spherically symmetric charged thin-shell wormhole using the cut-and-paste technique implemented by Visser in Einstein–Maxwell gravity with a conformally... 相似文献
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A four-component dusty plasma consisting of electrons, ions, and negative as well as positive dust particles has been considered. The basic features of shock waves that may exist in such a four-component dusty plasma have been theoretically investigated by the reductive perturbation method. The implications of our results in different regions of space (viz. cometary tails, mesosphere, Jupiter’s magnetosphere, etc.) are briefly discussed. 相似文献
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Natural Hazards - The present study deals with the gender aspects of water, sanitation and hygiene (WaSH) situation in post-cyclone Aila period in Bangladesh. Data were collected using... 相似文献
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Propagation of waves in a magnetized dusty plasma are studied for all the range of values of ion-cyclotron frequency, and
having streams of electrons and ions. The dispersion relation is obtained for the waves propagating through the dusty plasma
and analysed for different modes of propagation for relative abundance of dust in the plasma. It is observed that abundance
of dust, streaming motions of electrons and ions have an important influence on the propagation of waves in the dusty plasma
particularly when the phase velocity of the wave is in the low frequency region.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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Khurshed Akhtar 《Sedimentary Geology》1976,16(4):299-318
Special interest is attached to the Bhander Limestone because it is the only calcareous formation in the very thick elastic sequence of Precambrian age, designated informally as the “Upper” Vindhyan. The sedimentology of the Bhander Limestone was studied in the Mandalgarh-Singoli area of southeastern Rajasthan and adjoining Madhya Pradesh with a view to interpreting the depositional environments of the formation. This study has an important bearing on the exploration for oil in India and presents one of the few examples of Precambrian limestones of which thorough modern sedimentological analysis has been made.The Bhander Limestone comprises micritic limestones, crystalline dolostones, siltstones and shales that show desiccation structures (horizontal fenestrae, bird's-eye structures, mud cracks), very shallow small channels filled with flat-pebble breccia, algal lamination, palisade structure, and occasional ripple marks, ripple lamination and micro-cross-lamination. The major petrographic constituents are micrite, intraclasts, sparry-calcite cement, pseudospar and replacement dolomite. Seven environmentally significant microfacies have been recognized: micrite, silty micrite, graded micrite, dolomitized micrite, neomorphosed micrite, intrasparrudite and intramicrudite.The Bhander Limestone Formation has been divided vertically into four lithofacies: red argillaceous micritic limestones (lithofacies A), interlaminated blue micritic limestones and red dolomite (lithofacies B), olive calcareous shales (lithofacies C), and black micritic limestones (lithofacies D). Each lithofacies is characterized by certain megascopic sedimentary features and microfacies. The various lithofacies have been interpreted as representing deposition in the different subenvironments of a generally low-energy, marginal marine environment comprising tidal flats and lagoons. The vertical changes from one lithofacies to another are interpreted as reflecting the change from one subenvironment to another brought about by the landward shifting of the boundaries of these subenvironments in response to a transgression. 相似文献
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