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Search Results: 1 - 10 of 176 matches for " Dhiraj Sud "
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Modified agricultural waste biomass with enhanced responsive properties for metal-ion remediation: a green approach
Garima Mahajan,Dhiraj Sud
Applied Water Science , 2012, DOI: 10.1007/s13201-012-0050-5
Abstract: Dalbergia sissoo pods, a lignocellulosic nitrogenous waste biomass, was evaluated for sequestering of Cr(VI) from synthetic wastewater. Dalbergia sissoo pods (DSP) were used in three different forms, viz. natural (DSPN), impregnated in the form of hydrated beads (DSPB), and in carbonized form (DSPC) for comparative studies. Batch experiments were performed for the removal of hexavalent chromium. Effects of pH adsorbent dose, initial metal-ion concentration, stirring speed, and contact time were investigated. The removal of metal ions was dependent on the physico-chemical characteristics of the adsorbent, adsorbate concentration, and other studied process parameters. Maximum metal removal for Cr(VI) was observed at pH 2.0. The experimental data were analyzed based on Freundlich and Langmuir adsorption isotherms. Kinetic studies indicated that the adsorption of metal ions followed a pseudo-second-order equation.
KINETICS AND EQUILIBRIUM STUDIES OF Cr(VI) METAL ION REMEDIATION BY ARACHIS HYPOGEA SHELLS: A GREEN APPROACH
Garima Mahajan,Dhiraj Sud
BioResources , 2011,
Abstract: Arachis hypogea shells (ground nut shells), a lignocellulosic waste biomass, was evaluated for sequestering of Cr(VI) from synthetic wastewater. Arachis hypogea shells (AHS) were used in three different forms, viz. natural (AHSN), immobilized in the form of beads (AHSB), and in the form of activated carbon (AHSC). Batch experiments were performed for the removal of hexavalent chromium. Effects of pH adsorbent dose, initial metal ion concentration, stirring speed, and contact time were investigated. The removal of metal ions was dependent on the physico-chemical characteristics of the adsorbent, adsorbate concentration, and other studied process parameters. Maximum metal removal for Cr(VI) was observed at pH 2.0. The experimental data were analyzed based on Freundlich and Langmuir adsorption isotherms. Kinetic studies indicated that the adsorption of metal ions followed a pseudo-second-order equation.
Inhibition of nitrification in soil by metal diethyldithiocarbamates
AArora,Bijay Singh,Dhiraj Sud,TSrivastava,CLArora,
A. Aror
,Bijay Singh,Dhiraj Su,T.Srivastav,C. L. Arora

环境科学学报(英文版) , 2003,
Abstract: Nitrification acts as a key process in determining fertilizer use efficiency by crops as well as nitrogen losses from soils. Metal dithiocarbamates in addition to their pesticidal properties can also inhibit biological oxidation of ammonium(nitrification) in soil. Metal M = V(III), Cr(III), Mn(II), Fe(III), Ni(II), Cu(II), Zn(II) and Co(II)] diethyldithiocarbamates (DEDTC) were synthesized by the reaction of sodium diethyldithiocarbamate with metal chloride in dichloromethane/water mixture. These metal diethyldithiocarbamates were screened for their ability to inhibit nitrification at different concentrations( 10 microg/g soil, 50 microg/g soil and 100 microg/g soil). With increasing concentration of the complex, capacity to retard nitrification increased but the extent of increase varied for different metals. At 100 microg/g soil, different complexes showed nitrification inhibition from 22.36% to 46.45% . Among the diethyldithiocarbamates tested, Zn(DEDTC)2 proved to be the most effective nitrification inhibitor at 100 microg/g soil. Manganese, iron and chromium diethyldithiocarbamates also proved to be effective nitrification inhibitors than the others at 100 microg/g soil. The order of percent nitrification inhibition in soil by metal diethyldithiocarbamates was: Zn(II) > Mn(II) > Fe(III) > Cr(III) > V(III) > Co(II) > Ni(II) > Cu(II).
TEC and Instrumental Bias Estimation of GAGAN Station Using Kalman Filter and SCORE Algorithm  [PDF]
Dhiraj Sunehra
Positioning (POS) , 2016, DOI: 10.4236/pos.2016.71004
Abstract: The standalone Global Positioning System (GPS) does not meet the higher accuracy requirements needed for approach and landing phase of an aircraft. To meet the Category-I Precision Approach (CAT-I PA) requirements of civil aviation, satellite based augmentation system (SBAS) has been planned by various countries including USA, Europe, Japan and India. The Indian SBAS is named as GPS Aided Geo Augmented Navigation (GAGAN). The GAGAN network consists of several dual frequency GPS receivers located at various airports around the Indian subcontinent. The ionospheric delay, which is a function of the total electron content (TEC), is one of the main sources of error affecting GPS/SBAS accuracy. A dual frequency GPS receiver can be used to estimate the TEC. However, line-of-sight TEC derived from dual frequency GPS data is corrupted by the instrumental biases of the GPS receiver and satellites. The estimation of receiver instrumental bias is particularly important for obtaining accurate estimates of ionospheric delay. In this paper, two prominent techniques based on Kalman filter and Self-Calibration Of pseudo Range Error (SCORE) algorithm are used for estimation of instrumental biases. The estimated instrumental bias and TEC results for the GPS Aided Geo Augmented Navigation (GAGAN) station at Hyderabad (78.47°E, 17.45°N), India are presented.
Characterization and Modeling of Urban Water Quality in the City of Calgary, Canada  [PDF]
Dhiraj Shrestha, Jianxun He
Natural Resources (NR) , 2017, DOI: 10.4236/nr.2017.88032
Abstract: Non-point source pollution (NPS) besides point source pollution (PS) has contributed to pollutant loading into natural receiving water bodies. Due to the nature of NPS, the quantification of pollutant loading from NPS is very challenging but crucial to riverine water quality management, especially for the river reach flowing through urban areas. The water quality in the river reach of the Bow River flowing through the City of Calgary in Alberta, Canada, is affected by both PS and NPS. Thus, understanding and characterizing water quality of discharges (affected by NPS) into the river reach is necessary for better managing riverine water quality and preventing water quality degradation. In the paper, monitored event mean concentrations (EMCs) of stormwater runoff and mean concentrations of snowmelt and baseflow of seven common pollutants from sub-catchments, which are categorized into four land use types including commercial, industrial, residential and on-going development land uses, were used to investigate the linkage between land use and water quality. Statistical analysis techniques were adopted to identify differences or similarities in water quality among different flow types, different land use types, and among/between catchments of same land use. The results indicated that EMCs of many water quality parameters vary among different land use types and among/between catchments of same land use. The results also showed median EMCs of pollutants of snowmelt and baseflow are, in general, lower than those of stormwater runoff. In addition, Stormwater Management Model was employed to investigate the physical process that would affect water quality response to storm events for two typical land uses, industrial and residential land uses. The modeling results supported that wash-off of particulate matters might primarily affect water quality response of catchments between different land uses. All the results shed the light on the necessity of quantifying pollutant loading considering the characteristics of land uses.
AYUR INFORMATICS: NEED OF THE HOUR
Sushant Sud,Khyati S. Sud
International Journal of Research in Ayurveda and Pharmacy , 2013, DOI: 10.7897/2277-4343.04242
Abstract: Ayurved, the traditional Indian medicines remains the most ancient yet living traditions. Information technology is currently taking center stage and has transformed the entire world into a global market. Globalization and vast spreading competition all around have accelerated the need for knowledge and intensive work performance in all the sectors of economy. The globalization, product patency, intellectual property rights issues and most important bio-piracy are becoming major challenges in the traditional indigenous medical (TIM) system like Ayurved. Efforts to monitor and regulate Ayurvedic traditional medicines are underway. Existing Information and Communication Technology implementations are mostly and to be specific largely top-down in their flow of information i.e. from experts to target groups.Ayurved needs to be restructured globally to meet the rising demands of a cyber mobile society with the application of information and communication technology. This paper discusses the impact of IT and the advances in information and communication technologies (ICTs) in this scientific age .Therefore, Ayurved needs Ayur-informatics to keep pace with this modern world.
SST and ADITYA tokamak research in India
Bora, Dhiraj;,;,;
Brazilian Journal of Physics , 2002, DOI: 10.1590/S0103-97332002000100032
Abstract: steady state operation of tokamaks plays an important role in high temperature magnetically confined plasma research. steady state superconducting tokamak (sst) programme in india deals with the development of various technologies in this direction. sst-1 [1] machine has been engineered and is being fabricated at the institute for plasma research. the objectives of the machine are to study physics of plasma processes under steady state condition and develop the technologies related to steadystate operation. various sub-systems are being prototyped and developed. sst-1 is a large aspect ratio machine with a major radius of 1.1 m and a plasma minor radius of 0.2 m with elongation of 1.7 to 1.9 and triangularity of 0.5 to 0.7. it has been designed for 1000 sec operation at 3 t toroidal magnetic eld. neutral beam injection and radio frequency heating systems are being developed to heat the plasma. lower hybrid current drive system would sustain 200 ka of plasma current during 1000 sec operation. aditya tokamak [2] has been upgraded with new diagnostics and rf heating systems. thomson scattering and ece diagnostics have been operated. 200 kw ion cyclotron resonance heating (icrh) and 200 kw electron cyclotron resonance heating (ecrh) systems have been successfully commissioned. rf assisted initial breakdown experiments have been initiated with these systems.
Does Technology Lead to Better Financial Performance? A Study of Indian Commercial Banks
Dhiraj Sharma
Managing Global Transitions , 2012,
Abstract: It has been a matter of debate whether Technology provides better financial results and improves productivity. The present paper attempts to study the inter-group comparison of financial performance of Indianbanks by classifying the banks on the basis of usage of Technology. Further,for the purpose of temporal comparison, the period for the studyhas been divided into two parts, i. e. low technology induction periodand high technology induction period. Findings of the paper show thatthe fully IT oriented banks are financially better off than the partiallyIT oriented banks. Moreover, the performance of almost all the banksunder study has tremendously improved in the high technology inductionperiod. However, for the Indian banking industry, the correlationbetween Technology induction and financial productivity is negativethough statistically insignificant and low.
An Improved Approach to perform Crawling and avoid Duplicate Web Pages
Dhiraj Khurana
International Journal of Computer Science and Management Studies , 2012,
Abstract: When a web search is performed it includes many duplicate web pages or the websites. It means we can get number of similar pages at different web servers. We are proposing a Web Crawling Approach to Detect and avoid Duplicate or Near Duplicate WebPages. In this proposed work we are presenting a keyword Prioritization based approach to identify the web page over the web. As such pages will beidentified it will optimize the web search.
SST and ADITYA tokamak research in India
Bora Dhiraj
Brazilian Journal of Physics , 2002,
Abstract: Steady state operation of tokamaks plays an important role in high temperature magnetically confined plasma research. Steady state Superconducting Tokamak (SST) programme in India deals with the development of various technologies in this direction. SST-1 [1] machine has been engineered and is being fabricated at the Institute for Plasma Research. The objectives of the machine are to study physics of plasma processes under steady state condition and develop the technologies related to steadystate operation. Various sub-systems are being prototyped and developed. SST-1 is a large aspect ratio machine with a major radius of 1.1 m and a plasma minor radius of 0.2 m with elongation of 1.7 to 1.9 and triangularity of 0.5 to 0.7. It has been designed for 1000 sec operation at 3 T toroidal magnetic eld. Neutral beam Injection and Radio frequency heating systems are being developed to heat the plasma. Lower hybrid Current Drive system would sustain 200 kA of plasma current during 1000 sec operation. ADITYA tokamak [2] has been upgraded with new diagnostics and RF heating systems. Thomson Scattering and ECE diagnostics have been operated. 200 kW Ion Cyclotron Resonance Heating (ICRH) and 200 kW Electron Cyclotron Resonance Heating (ECRH) systems have been successfully commissioned. RF assisted initial breakdown experiments have been initiated with these systems.
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