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Search Results: 1 - 10 of 708 matches for " Meenakshi Pant "
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Conductivity Studies in Proton Irradiated AgI-Ag2O-V2O5-TeO2 Super-Ionic Glass System  [PDF]
Poonam Sharma, Dinesh Kumar Kanchan, Meenakshi Pant, Karan Pal Singh
Materials Sciences and Applications (MSA) , 2010, DOI: 10.4236/msa.2010.12011
Abstract: The electrical properties of proton ion beam irradiated glass samples are carried out by impedance spectroscopy in the frequency range from 10 Hz to 32 MHz. The ion beam of energy 3 MeV and fluence of of 1014 particles cm-2 was chosen for irradiation. The conductivity of the super ionic glass samples increases after irradiation and other electrical parameters like dielectric constant, dielectric loss and modulus of the proton irradiated glass samples as a function of glass composition and temperature are observed to change. The dielectric constant and the dielectric losses are increased after irradiation and the modulus parameters confirm the non-Debye nature for irradiated samples also.
Effect of AgI on Conduction Mechanism in Silver-Vanadate Superionic Glasses  [PDF]
Poonam Sharma, D.K. Kanchan, Meenakshi Pant, Manish S. Jayswal, Nirali Gondaliya
New Journal of Glass and Ceramics (NJGC) , 2011, DOI: 10.4236/njgc.2011.13016
Abstract: A quaternary super-ionic glass system xAgI: (95-x) [Ag2O:2V2O5]: 5TeO2, where 40 ≤ x ≤ 65 in steps of 5, has been pre- pared by melt quenching technique. The prepared glass samples are characterized by X-ray, FTIR and DSC studies. As revealed by the FTIR spectra, the oxyanion network is not affected by the addition of AgI. The frequency dependence of the electrical conductivity for various glass compositions at different temperatures has been analyzed in terms of Jon- scher’s universal power law. The measurements reveal that the conductivity increases from σ = 7.62 × 10–7 S/cm to 1.15 × 10–4 S/cm with increasing AgI content. The temperature dependent conductivity obeys the Arrhenius relationship. The impedance and modulus studies indicate the non-debye type of the frequency dispersion for all the glass samples.
The Effect of Mixed Iodide Salts on the Conductivity Behavior in Ag2O-V2O5-B2O3 Superionic Glass System  [PDF]
Poonam Sharma, D.K. Kanchan, Nirali Gondaliya, Meenakshi Pant, Manish S. Jayswal
New Journal of Glass and Ceramics (NJGC) , 2011, DOI: 10.4236/njgc.2011.13018
Abstract: A superionic mixed metal iodide glass system [(PbI2 –CuI ) - Ag2O- V2O5- B2O3] has been prepared by splat quenching technique. The prepared glass samples are characterized by X-ray diffraction (XRD) and differential scanning calo- rimetry (DSC). The effect of mixed metal iodide salts concentration on electrical properties has been investigated by the complex impedance spectroscopy (CIS). AC conductivity analysis is carried out in the frequency range of 2MHz-1Hz at different temperatures and an enhancement in the conductivity with iodide salts is the main feature of the observed re- sults with an anomaly at 20 mole % of PbI2 –CuI.
Land Use Impact on Bioavailable Phosphorus in the Bronx River, New York  [PDF]
Jingyu Wang, Hari Pant
Journal of Environmental Protection (JEP) , 2011, DOI: 10.4236/jep.2011.24038
Abstract: Various forms of phosphorus (P) could become bioavailable such as from desorption, dissolution and enzymatic hydrolysis. Potential bioavailable P estimation is critical to minimize eutrophication in freshwater systems. Thus, this study was conducted to predict potential bioavailable P in the water columns and sediments and their relations with enzymatic hydrolysis, and estimate impacts of land use and anthropogenic activities on P bioavailability, P transport and water quality in the Bronx River, New York, USA. In sediment samples collected in 2006, total P (TP), total inor-ganic P (IP), total organic P (OP) and bioavailable P (BAP) were in highest concentrations in sites located at Bronx River Valley upstream in Westchester (site 2), Troublesome Brook (TB, site 4), Sprain Brook (SB, site 7b) and Bronx River estuary near Sound View Park (site 14) respectively. Also, phosphodiesterase and native phosphatases (PDEase and NPase) hydrolyzed distinguishingly high amounts of OP or enzymatically hydrolysable P (EHP) in samples from sites 4, 7b, 10 (New York Botanical Garden) and 14. Microbial P was in negative values (caused by different bacteria and microorganisms could not be paralyzed by chloroform), and the most negative concentrations were appeared at sties 4 and 14. Spatial comparisons among different locations showed distinguished characteristics in tributaries and estuary. In sediments collected in 2007, TP, BAP and IP were in highest concentrations at sites 7-SB, 11-Bronx Zoo, 12-East Tremont Ave Bridge where fresh and saline water meets, 13-estuary facing Hunts Point Waste Water Treatment Plant (HP WWTP) and 14-estuary along Sound View Park. Besides, PDEase-P highest concentrations ap-peared at sties 7, 13 and 11, NPase-P concentrations were highest at 7 and 11. Microbial P was highest at sties 11 and 14. Spatial variations showed that higher P content and more intense enzymatic hydrolysis in silty clay finer sediments at site 7, 11 and 13. Temporal variations between the two years’ data showed land use and other anthropogenic factors’ impacts on P transport in river and deposit in sediments. Analysis of the river water samples showed that average soluble reactive P (SRP, 67 μg.l-1) in 2006 and SRP (68μg.l-1) in 2007 both were greater than background P concentration in most natural water (42 μg.l-1).
Selective Recognition and Detection of L-Aspartic Acid by Molecularly Imprinted Polymer in Aqueous Solution  [PDF]
Nazia Tarannum, Meenakshi Singh
American Journal of Analytical Chemistry (AJAC) , 2011, DOI: 10.4236/ajac.2011.28105
Abstract: Molecularly imprinted polymers selective for L-aspartic acid (LAA) have been prepared using the carboxy-betaine polymer bearing zwitterionic centres along the backbone. LAA is well known to promote good me-tabolism, treat fatigue and depression along with its significance in accurate age estimation in the field of forensic science and is an important constituent of ‘aspartame’, the low calorie sweetener. In order to study the intermolecular interactions in the prepolymerization mixture between the monomer and the template (LAA)/non-template (DAA), a computational approach was developed. It was based on the binding energy of the complex between the template and functional monomer. The results demonstrate that electrostatic in-teractions primarily guide the imprinting protocol. The MIP was able to selectively and specifically take up LAA from aqueous solution, human blood serum and certain pharmaceutical samples quantitatively. Hence, a facile, specific and selective technique to detect the amino acid, LAA in the presence of various interfer-rants, in different kinds of matrices is presented.
An Intelligent Fuzzy Based Energy Detection Approach for Cooperative Spectrum Sensing  [PDF]
Sitadevi Bharatula, Meenakshi Murugappan
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.76088
Abstract: Cognitive radio systems are helpful to access the unused spectrum using the popular technique, referred to as spectrum sensing. Spectrum sensing involves the detection of primary user (PU) signal using dynamic spectrum access. Cooperative spectrum sensing takes advantage of the spatial diversity in multiple cognitive radio user networks to improve the sensing accuracy. Though the cooperative spectrum sensing schemes significantly improve the sensing accuracy, it requires the noise variance and channel state information which may lead to transmission overhead. To overcome the drawbacks in conventional cooperative spectrum sensing, this paper proposes a fuzzy system based cooperative spectrum sensing. Selection combining (SC) and maximum ratio combining (MRC) are used at fuzzy based fusion center to obtain the value of the sensing energy. These energy values are utilized in finding the presence of PU, results in improved sensing accuracy. In addition, an intelligent fuzzy fusion algorithm determines the PU presence without the channel state information based on multiple threshold values. Simulation results show that the proposed scheme outperforms the existing schemes in terms of sensing accuracy.
Estimation of Phosphorus Bioavailability in the Water Column of the Bronx River, New York  [PDF]
Jingyu Wang, Hari K. Pant
Journal of Environmental Protection (JEP) , 2012, DOI: 10.4236/jep.2012.34040
Abstract: Phosphorus (P) is a primary limiting nutrient in rivers and streams, and excessive P results in eutrophication of freshwater systems, in turn, excessive algal growth/toxic algal blooms, oxygen depletion, and water quality degradation. This study analyzed P pool, and hydrolysis of organic P (OP) by native phosphatases (NPase) in the water samples collected in the Bronx River. The soluble reactive P (SRP) of most of the sites’ water collected in 2006 and 2007 were higher (average 67 μg?L–1 and 68 μg?L–1, respectively) than the US Environmental Protection Agency’s (EPA) standard of 15 μg?L–1. The SRP% (SRP/TP%) average was 27% in 2006, much lower than in 2007 of SRP% average 83%. The OP% (OP/TP%) average was 73% in 2006, which was much higher than the OP% in 2007 (which was only 17%). The SRP concentrations and distributions (%), and the total P (TP) concentrations were in substantial amounts compared with other rivers. The NPase hydrolyzed OP % was up to 100% in 2006 and 2007 water samples. The average of NPase% was 59% in 2006 and 73% in 2007. The NPase average concentrations were 348 μg?L–1 in 2006, and 175 μg?L–1 in 2007. The NPase hydrolyzed up to 100% of OP% in the Bronx River water samples at 37?C, indicating a potential threat of eutrophication of freshwater systems as the global rise in temperature may continue to occur.
Environmental Determinants of Disease Prevalence in Rural Western Nepal  [PDF]
Uttam Paudel, Krishna Prasad Pant
Journal of Environmental Protection (JEP) , 2018, DOI: 10.4236/jep.2018.912077
Abstract: Environmental determinants causing unexpected disease rampant are seemed major challenges to be protective from inevitable hazards and to deal the future consequences in terms of human health loss. This paper explores the major environmental determinants stimulating disease prevalence in western hilly areas of Nepal. Cross-sectional analytical research design for household level primary data was treated with the binary logit regression model to identify the determinants of disease prevalence. Extreme winter temperature, decreasing winter rainfall, sporadic rain, drying spout and decreasing the tree species are the major environmental determinants; hand washing, proper management of solid waste from kitchen and habit of drinking boiled water are as household behavioral determinants; and adequate family members, higher education, use of pesticide to control the insects and use of clean cooking fuels are socioeconomic determinants encouraging disease prevalence. Plantation of large perennial and medicinal plants, proper management of warm clothes or heaters especially for old people and children having respiratory problems for extreme winter; management of water tank for long drought in winter and community awareness campaign for the protection of spout are urgent needs for the prevention of current disease prevalence. Ergo, the recommendations are made accordingly.
Imperfection of Domain Knowledge and Its Formalization in Context of Design of Robust Software Systems  [PDF]
Meenakshi Sridhar, Naseeb Singh Gill
Journal of Software Engineering and Applications (JSEA) , 2015, DOI: 10.4236/jsea.2015.89047
Abstract: In this paper, it is emphasized that taking into consideration of imperfection of knowledge, of the team of the designers/developers, about the problem domains and environments is essential in order to develop robust software metrics and systems. In this respect, first various possible types of imperfections in knowledge are discussed and then various available formal/mathematical models for representing and handling these imperfections are discussed. The discussion of knowledge classification & representation is from computational perspective and that also within the context of software development enterprise, and not necessarily from organizational management, from library & information science, or from psychological perspectives.
A review: Advances in microbial remediation of trichloroethylene (TCE)
A review: Advances in microbial remediation of trichloroethylene (TCE)

Prabhakar Pant,Sudhakar Pant,
Prabhakar Pant
,Sudhakar Pant

环境科学学报(英文版) , 2010,
Abstract: Research works in the recent past have revealed three major biodegradation processes leading to the degradation of trichloroethylene. Reductive dechlorination is an anaerobic process in which chlorinated ethenes are used as electron acceptors. On the other hand, cometabolism requires oxygen for enzymatic degradation of chlorinated ethenes, which however yields no benefit for the bacteria involved. The third process is direct oxidation under aerobic conditions whereby chlorinated ethenes are directly used as...
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