A Breadth Averaged Numerical Model for Suspended Sediment Transport in Hooghly Estuary,East Coast of India   总被引：2，自引：0，他引：2  

Sinha  P. C.  Guliani  Pragya  Jena  G. K.  Rao  A. D.  Dube  S. K.  Chatterjee  A. K.  Murty  Tad 《Natural Hazards》2004,32(2):239-255

Sedimentation is of vital concern in the conservation, development and utilization ofour soil and water resources. The suspended sediment in estuarine waters is hazardousto navigation in estuaries, which have important ports and harbours. A breadth-averagednumerical model to study circulation and sediment transport is presented in this paper.The model is applied to Hooghly estuary, along the east coast of India. The model is fullynon-linear and uses a semi-explicit finite difference scheme to solve mass, momentum andadvection diffusion equation for suspended sediments in a vertical plane. The erosion anddeposition have been computed by empirically developed source and sink terms in thesuspended sediment equation.  相似文献   

Production of P(3HB‐co‐3HHx) with Controlled Compositions by Recombinant Cupriavidus necator Re2058/pCB113 from Renewable Resources          下载免费PDF全文

Paramasivam Murugan  Pragya Chhajer  Akihiko Kosugi  Takamitsu Arai  Christopher J. Brigham  Kumar Sudesh 《洁净——土壤、空气、水》2016,44(9):1234-1241

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Structural and luminescent characterisation of uraniferous fluorapatite and haematite associated with phosphatic rocks of the Bijawar group in Sagar District,Madhya Pradesh (India)     

Pragya Pandit  Shailendra Kumar  Pargin Bangotra  Rohit Mehra  Manoj Mohapatra  Madhuparna Roy  A K Singh 《Journal of Earth System Science》2018,127(8):110

The structural and spectroscopic characteristics of phosphatic ferruginous shale samples from the Bijawar Group rocks from Sagar District of Madhya Pradesh (India) have been probed for identification of uranium species. Fluorapatite (\(\hbox {Ca}_{5}\hbox {(PO}_{4})_{3}\hbox {F}\), FAP) and haematite (\(\upalpha \)-\(\hbox {Fe}_{2}\hbox {O}_{3}\)) were identified as the main phases in the separated mineral concentrates. The photoluminescence (PL) and X-ray absorption near edge spectroscopy (XANES) studies pointed to a strong experimental evidence of both U(IV) and U(VI) oxidation states in the mineral concentrate portion obtained from the same parent host rock. The PL spectrum has confirmed the charge transfer (f–d) transition bands in UV and near-UV regions with emission peaks at ca. 290, 313, 336, 399 and 416 nm, which has been attributed to the substitution of \(\hbox {Ca}^{2+}\) ions by U(IV) in FAP and broad structureless emission due to stabilisation of U(VI) as \(\hbox {UO}_{6}^{6-}\) in haematite. Time-resolved spectroscopy studies have revealed biexponential decay components lasting 2–5 ns for U(IV) species and \(10\,\upmu \hbox {s}\) for U(VI) species. These characterisations revealed the fundamental information about the oxidation state and form of uranium in this region. Remediation measures for the Bijawar region are also suggested.  相似文献