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Search Results: 1 - 10 of 21749 matches for " Manoj Kumar "
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Studies on Chromate Removal by Chromium-Resistant Bacillus sp. Isolated from Tannery Effluent  [PDF]
Manoj Kumar Chaturvedi
Journal of Environmental Protection (JEP) , 2011, DOI: 10.4236/jep.2011.21008
Abstract: A chromate-removing strain was isolated from spent chrome effluent and identified as Bacillus circulans strain MN1. The isolated strain was studied for resistance to Cr (VI) and its ability to remove Cr (VI). The strain was found to tolerate Cr (VI) concentration as high as 4500 mg/L, but the cells growth was heavily influenced when initial Cr (VI) concentration was increased between 1110 mg/L and 4500 mg/L while Cr(VI) at 500 mg/L to 1110 mg/L did not suppressed the cells growth. The experiments also demonstrated that the cells removed toxic Cr (VI) more efficiently at 30?C compared with that at 25?C and 35?C. The optimum initial pH for Cr (VI) removal was 5.6 and final pH values of 5.1-5.6 were observed for initial pH 5.2-5.7.
An Introduction to Numerical Methods for the Solutions of Partial Differential Equations  [PDF]
Manoj Kumar, Garima Mishra
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.211186
Abstract: Partial differential equations arise in formulations of problems involving functions of several variables such as the propagation of sound or heat, electrostatics, electrodynamics, fluid flow, and elasticity, etc. The present paper deals with a general introduction and classification of partial differential equations and the numerical methods available in the literature for the solution of partial differential equations.
Exact Solution of Second Grade Fluid in a Rotating Frame through Porous Media Using Hodograph Transformation Method  [PDF]
Sayantan Sil, Manoj Kumar
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.311172
Abstract: In this paper exact solution for a homogenous incompressible, second grade fluid in a rotating frame through porous media has been provided using hodograph-Legendre transformation method. Results are summarised in the form of theorems. Two examples have been taken and streamline patterns are shown for the solutions.
Numerical Treatment of Nonlinear Third Order Boundary Value Problem  [PDF]
Pankaj Kumar Srivastava, Manoj Kumar
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.28132
Abstract: In this paper, the boundary value problems for nonlinear third order differential equations are treated. A generic approach based on nonpolynomial quintic spline is developed to solve such boundary value problem. We show that the approximate solutions of such problems obtained by the numerical algorithm developed using nonpolynomial quintic spline functions are better than those produced by other numerical methods. The algorithm is tested on a problem to demonstrate the practical usefulness of the approach.
Distribution, Enrichment and Ecological Risk Assessment of Six Elements in Bed Sediments of a Tropical River, Chottanagpur Plateau: A Spatial and Temporal Appraisal  [PDF]
Kumar Manoj, Pratap Kumar Padhy
Journal of Environmental Protection (JEP) , 2014, DOI: 10.4236/jep.2014.514136
Abstract: Distribution and enrichment of six elements (iron, zinc, copper, lead, cadmium and manganese) in surface bed sediments, collected from seventeen selected locations during pre-monsoon and postmonsoon periods, of the tropical Chottanagpur plateau river Subarnarekha along with the ecological risks involved were investigated. Owing to the rich occurrence of mineral resources, the Subarnarekha river basin has a large scale presence of industrial and mining units especially in the Indian State of Jharkhand. An assessment, which involved examining distribution pattern of elements, comparative studies with sediment quality guidelines (SQGs) and geochemical background values and a sequential and integrated index analyses approach (containing contamination factor (CF), pollution load index (PLI), contamination degree (CD), enrichment factor (EF), geo-accumulation index (Igeo) and potential ecological risk index (PERI)), was followed to estimate enrichment and risks of elements in the bed sediments. Sediments collected from areas having abundance of population, industrial conglomerates and mining units recorded elevated element concentrations, which exceeded SQGs, and significantly higher values of CF, CD, PLI, EF, Igeo and PERI. Cadmium demonstrated surprising regularity in its enrichment; contributed most to the ecological risks; and high toxicity risks due to cadmium exceeded 64% of the sites. Moreover, chronic exposures of other elements would also lead to similar ecological risks. In addition to revealing potential ecological risks due to cadmium and other elements our investigation markedly highlighted anthropogenic control over sediment quality deterioration and some immediate sediment quality management strategies are needed to remediate and control river bed contamination.
Suggested health services research action to achieve reduction of neonatal mortality in India  [PDF]
Manoj Kumar, Haresh M Kirpalani
Open Journal of Preventive Medicine (OJPM) , 2011, DOI: 10.4236/ojpm.2011.12009
Abstract: Despite several national programs to reduce infant mortality, India had repeatedly failed to achieve its set targets for infant mortality. There are approximately one million neonatal deaths in India each year which accounts for nearly two-thirds of the infant deaths in India. India’s current trajectories of neonatal and infant mortality rates make it unlikely that it will achieve its targets for infant mortality rate for 2015 set under the Millennium Development Goals. Since two-thirds of infant deaths in India are neonatal deaths, implementation of effective neonatal care strategies would be essential to reduce infant mortality considerably. The history of child health services in India suggests an inattention to qualitative parameters, hindering a reversal of its failures. We discuss a format of mixed-methods participatory research, integrated with routine district level household surveys (DLHS), as a model of health services research which would better delineate the problems encountered in delivering effective newborn care at the primary care level.
Electric and Magnetic Fields from Return Stroke-Lateral Corona System and Red Sprites  [PDF]
Manoj Kumar Paras, Jagdish Rai
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2011, DOI: 10.4236/jemaa.2011.312076
Abstract: Electric and magnetic fields in time and frequency domain due to return stroke-lateral corona (RS-LC) system and re- cently discovered red sprites have been calculated. It has been found that the electric and magnetic fields due to return stroke and lateral corona system radiate in the very low frequency (VLF) region while due to sprites radiate in the ex- tremely low frequency (ELF) range. A comparison has been made between the radiations emitted due to RS-LC system and sprites in ELF (0 - 200 Hz) region. It has been found that the electric field i.e. radiation power generated due to sprites dominates in the ELF range and thus it is concluded that the red sprites as compared to the RS-LC system are the prominent source for the excitation of Schumann resonances in the earth-ionosphere waveguide.
Grafting Vinyl Monomers onto Chitosan:IV:Graft Copolymerized of Acrylicacid onto Chitosan Using Ceric Ammonium Nitrate as the Initiator— Characterization and Antimicrobial Activities  [PDF]
Manoj Kumar Pati, Padmalochan Nayak
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.212232
Abstract: Acrylicacid was grafted onto chitosan by using the ceric ammonium nitrate as the initiator. The effect of initiator concentration, monomer concentration, time & temperature on % G and % GE were studied. The grafted samples were characterized using FTIR, TGA, SEM and XRD methods. From the FTIR data it was ascertained that grafting has occurred considerably. The morphology of the grafted polymer was observed from the SEM picture. The thermal analysis indicated the different stages of degradation of the grafted copolymer. Evidence of grafting was obtained from comparison of SEM, XRD, and FTIR of the grafted and nongrafted chitosan as well as solubility characteristics of the products. The antibacterial and antifungal activities of the grafted polymer have also been investigated.
Rating Curve Estimation of Surface Water Quality Data Using LOADEST  [PDF]
Bhasker Jha, Manoj Kumar Jha
Journal of Environmental Protection (JEP) , 2013, DOI: 10.4236/jep.2013.48099
Abstract:

Measurement of the nutrient concentrations in the stream is usually done on weekly, biweekly or monthly basis due to limited resources. There is need to estimate concentration and loads during the period when no data is available. The objectives of this study were to test the performance of a suite of regression models in predicting continuous water quality loading data and to determine systematic biases in the prediction. This study used the LOADEST model which includes several predefined regression models that specify the model form and complexity. Water quality data primarily nitrogen and phosphorus from five monitoring stations in the Neuse River Basin in North Carolina, USA were used in the development and analyses of rating curves. We found that LOADEST performed generally well in predicting loads and observation trends with general tendency/bias towards overestimation. Estimated Total Nitrogen (TN) varied from observation (“true” load) by -1% to 9%, but for the Total Phosphorus (TP) it ranged from -2% to 27%. Statistical evaluation using R2, Nash-Sutcliff Efficiency (NSE) and Partial Load Factor (PLF) showed a strong correlation in prediction.

Performance Evaluation of Diversity Techniques in IDMA Scheme for Next Generation (4G) in Underwater Wireless Communication  [PDF]
Prachi Tripathi, Manoj Kumar Shukla
Wireless Engineering and Technology (WET) , 2014, DOI: 10.4236/wet.2014.53010
Abstract:
This paper provides a review on the diversity techniques of IDMA (Interleave Division Multiple Access) technology in underwater wireless IDMA employs interleavers as the only means in order to distinguish the users. This paper provides a comprehensive study of diversity techniques in IDMA scheme to mitigate the fading issue. In this paper, we compare the different generation diversity techniques in IDMA scheme on computational complexity, bit error rate and memory requirement. Recent advancement in underwater communication is modulation techniques, multiplexing techniques and multiple access techniques. Underwater communication channel is characterized.
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