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Nonlinear thermomechanical deformation behaviour of P-FGM shallow spherical shell panel

Chinese Journal of Aeronautics 2016年第1期29卷 173-183页

作者： vishesh ranjan kar Subrata Kumar Panda Department of Mechanical Engineering National Institute of Technology

In the present article, the linear and the nonlinear deformation behaviour of functionally graded （FG） spherical shell panel are examined under thermomechanical load. The temperature- dependent effective material properties of FG shell panel are evaluated using Voigt＇s micro-mechanical rule in conjunction with power-law distribution. The nonlinear mathematical model of the FG shell panel is developed based on higher-order shear deformation theory and Green-Lagrange type geometrical nonlinearity. The desired nonlinear governing equation of the FG shell panel is computed using the variational principle. The model is discretised through suitable nonlinear finite element steps and solved using direct iterative method. The convergence and the val- idation behaviour of the present numerical model are performed to show the efficacy of the model. The effect of different parameters on the nonlinear deformation behaviour of FG spherical shell panel is highlighted by solving numerous examples.

关键词： Functionally graded mate-rial Green-Lagrange Higher-order Nonlinear deformation Temperature-dependent

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Textural and geochemical characteristics of off shore sediment of North Bay of Bengal:A statistical approach for marine metal pollution

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International Journal of Sediment Research 2015年第3期30卷 208-222页

作者： Sanghamitra Palleyi Sabnam Banoo Rabi Narayan kar Chitta ranjan Panda Environment & Sustainability Department CSIR-Institute of Minerals and Materials Technology

Metal pollution study on sediments of North Bay of Bengal sediments presented in this paper is based on existing Lithostratigraphy of upstream,mineralogy and geochemical analysis of 42 sediment *** statistical analysis identifies the metal pollution as well as its apparent source in the off shore *** were analyzed for grain size,organic content and heavy metals(Fe,Mn,Cr,Cu,Ni,Pb,Cd,Zn and Co) using the sequential extraction method to evaluate geochemical processes and pollution *** an effort to surmise anthropogenic input,several approaches including classification by quantitative indexes such as enrichment factor,contamination factor,degree of pollution,pollution load index and geo accumulation index,were *** speciation results indicate high%of Cd in exchangeable fraction of Mahanadi transect sediments where as a considerable amount of oxidizable fraction of Cr was detected at *** indexes place North Bay of Bengal under moderately polluted zone due to high level of *** of metals to Fe indicated relatively high enrichment factors for Cd and *** analysis identified seven possible types of geochemical associations where sediment pH plays a major role for the heavy metal *** higher Cd concentration in exchangeable fraction as well as the higher EF for Cd and Cr present in sediment may pose a risk of secondary water pollution under slightest disturbance in the geo-chemistry of *** study with available data of near costal zones and upstream stratigraphy revealed that open cast mining,overburden dumping,mineral based industrial effluents were the major source of pollution for catchment area *** of Bengal is likely to face a serious threat of metal pollution with the present deposition rates unless rigorous pollution control norms are applied.

关键词： North Bay of Bengal Heavy metals Sequential extraction Quantitative index Factor analysis

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Seasonal Variation of the Physicochemical Properties of Water Samples in Mahanadi Estuary, East Coast of India

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Journal of Environmental Protection 2013年第8期4卷 843-848页

作者： Pravat ranjan Dixit Biswabandita kar Partha Chattopadhyay Chitta ranjan Panda CSIR-Institute of Minerals and Materials Technology Bhubaneswar India KIIT University Bhubaneswar KIIT University Bhubaneswar India

The two major sources which are contributing to marine pollution are natural processes as well as anthropogenic activities. The natural process includes precipitation, erosion, weathering of crystal material whereas anthropogenic activities are urbanization, industrialization, mining and agricultural activities, etc. Mahanadi is the biggest river source of Odisha which joins the Bay of Bengal at Paradip. Paradip Township is an urbanized well-developed industrial township where various anthropogenic activities are contributing pollution to the water sources. In the present study, an attempt has been made to estimate and monitor the seasonal and spatial variation of physiochemical properties of the Mahanadi estuary, the East Coast coastal belt of India. The result revealed that there is a remarkable variation in the physiochemical parameters such as pH, salinity, TSS, DO, BOD, NO2N, NO3N, NH4N, TN, TP, SIO4 and Chl-a which are attributed to the runoff water getting discharged to the coastal water sources. It is being recommended to treat waste water and materials before discharging them to the marine water medium.

关键词： Physicochemical Water Pollution Mahanadi Estuary

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Forecasting the Rainfall Pattern on Upstream of Hirakud Reservoir Using L-Moment for Accessing the Inflow

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Journal of Water Resource and Protection 2017年第12期9卷 1335-1346页

作者： Krishna Kumar Gupta Anil Kumar kar Joygopal Jena Dipti ranjan Jena Civil Engineering Department SOA University Bhubaneswar India VSSUT Burla Sambalpur India Civil Engineering GITA Bhubaneswar India Department of Geography Utkal University Bhubaneswar India

Changes in the rainfall pattern are a challenge for filling schedule of reservoir, when it is fulfilling various demands. In monsoon fed reservoirs, the target remains for attaining full reservoir capacity in order to meet various demands during non-monsoon period and the flood control. The planners always eye towards the inflow trend and perspective frequency of rainfall in order to counter the extreme events. In this study, the case of Hirakud reservoir of Mahanadi basin of India is considered as this reservoir meets various demands as well as controls devastating floods. The inflow trend has been detected by using Mann Kendall test. The frequency analysis of monthly rainfall is calculated using L-moment program for finalizing a regional distribution. The falling trend in inflow to reservoir is visualized in the month of July and August. The Wakeby distribution is found suitable for the monthly rainfall of July, September and October, where as in June and August, General Extreme Value (GEV), General Normal (GN) and Pearson Type-III (PT-III) distributions are found suitable. The regional growth factors for the 20, 40, 50 and 100-year return period rain-falls along with inflow to reservoir observed between 1958-2010 are calculated in this study as a referral for reservoir operation policy.

关键词： Hirakud Reservoir Trend Analysis L-Moment General Normal (GN) General Logistic (GL) Wakeby Distribution GEV

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