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Articles by Devendra Kumar
Total Records ( 4 ) for Devendra Kumar
  Mohan K. Kadalbajoo and Devendra Kumar
 

This paper is devoted to the numerical study of the boundary value problems for nonlinear singularly perturbed differential-difference equations with small delay. Quasilinearization process is used to linearize the nonlinear differential equation. After applying the quasilinearization process to the nonlinear problem, a sequence of linearized problems is obtained. To obtain parameter-uniform convergence, a piecewise-uniform mesh is used, which is dense in the boundary layer region and coarse in the outer region. The parameter-uniform convergence analysis of the method has been discussed. The method has shown to have almost second-order parameter-uniform convergence. The effect of small shift on the boundary layer(s) has also been discussed. To demonstrate the performance of the proposed scheme two examples have been carried out. The maximum absolute errors and uniform rates of convergence have been presented in the form of the tables.

  Hemen Sarma , Amit Kumar Tripathi , Souravjyoti Borah and Devendra Kumar
  The study reports the ethnobotany and threats to wild edible plants in Assam province of India, which is considered as a mega-biodiversity centre under two important biodiversity hotspots viz., Indo-Burma and Himalaya. The people living in remote/forest area still depend upon to a great extent on the indigenous system of medicine/cultivation. Here, we summarize the information derived through meta-analysis and present an updated estimate of the wild edible, medicinal and threatened plant species that has been reported by wide variety of taxonomic groups. Out of 3895 plant species nearly 7.34% were used as wild vegetables, fruits and ethno-medicines. In over all, 286 edible wild plant species estimated belong to 93 families and 192 genera are hitherto unknown or less known to the world. Of these, 150 species were reported to be used in traditional system of medicine. The estimates revealed that as many as 27 species were in the list of red data book, CITIES and IUCN red list threat categories due to over exploitations and these plants need a strong conservation and protection management.. In the present investigation, the work that has been reported and the potential of ethno-botanical studies with particular reference to biodiversity conservation of the important wild edible plant species have been highlighted in study area.
  Devendra Kumar
  Forest is a major resource and play vital role in maintaining the ecological balance and environmental setup. Over utilization of forest resources has resulted in the depletion. The changes in forest cover are the matter of global concern due to its ability of promoting role in carbon cycle. This study reviewed the potential application of remote sensing worldwide for assessing and monitoring the changes in forest cover during the past decades, an increasing urgent task. However, advances in the spatial and spectral resolutions of sensors are available for ecologist which mainly feasible, to study the certain aspects of biological diversity through direct remote sensing. Global and regional scale of temporal remote sensed data is now available for monitoring the changes in forest cover over the last few decades viz. Landsat, MODIS, ASTER, AWiFS and SPOT. Monitoring the changes in forest cover at global and regional scale can contribute to reducing the uncertainties in estimates of emissions of green house gases from deforestation. Remote sensing coupled with GIS (Geographical Information System) as a potential tool, for monitoring the changes in land cover at regional as well as global scale in developing countries, mainly by identifying the conservation priorities in global hotspots, rate of deforestation and quantification of overall forest cover loss at finer scale.
  Rajesha , Tarushee Ahuja and Devendra Kumar
  Nanomaterials of conjugated polymers are found to have superior performance relative to conventional materials due to their much larger exposed surface area. The present paper gives an overview of various recent synthetic approaches involving template free and template oriented techniques suitable for the growth of nanomaterials of conjugated polymers, their merits and application in making nanodevices. The characteristics of nano-structured conducting polymers and polymer nanocomposites, their application in sensors/biosensors and advances made in this field are reviewed.
 
 
 
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