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Synthesis of CaWO_4:Eu^(3+) phosphor powders via ethylene glycol route and its optical properties

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Journal of Rare Earths 2012年第4期30卷 310-314页

作者： K.Gayatri Sharma n.rajmuhon singh Department of Chemistry Manipur University Canchipur-795003 Imphal Manipur India

Eu3＋ doped CaWO4 with tetragonal system were prepared at comparatively low temperature （125 ℃） in ethylene glycol medium. The phosphor was further investigated by X-ray difffactometer （XRD）, photoluminescence spectrophotometer （PL）, Fourier transform infra red （FT-IR） spectroscopy and transmission electron microscopy （TEM）. XRD analysis indicated a decrease in the unit cell volume of CaWO4 with increasing Eu3＋ ion concentration. It indicated the homogeneous substitution of Ca2＋ ions in CaWO4 by the Eu3＋ ions. TEM images showed that the particle size ranged from 20 to 200 nm and it could extend the application of the nanoparticles. The photoluminescence study showed that the intensity of electric dipole transition （SD0→TF2） at 614 nm dominated over the magnetic dipole transition （SD0→TFx） at 592 nm. The optimum concentration of Eu3＋ for the highest luminescence was found to be 20 at.%. The as prepared samples were found to be dispersible in water and methanol.

关键词： CaWO4:Eu3+ capping agent photoluminescence dispersible rare earths

Zooplankton community of Keibul Lamjao national Park (KLnP) Manipur, India in relation to the physico-chemical variables of the water

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Chinese Journal of Oceanology and Limnology 2017年第3期35卷 469-480页

作者： Aribam Satishchandra SHARMA Susmita GUPTA n.rajmuhon singh Department of Ecology and Environmental Science E. P. Odum School of Environmental Sciences Assam University Department of Chemistry Manipur University

Keibul Lamjao national Park （KLnP）, a floating park in Loktak Lake, Manipur （India） was studied from Winter （WIn） to Post Monsoon （POM） for its zooplankton composition and some selected water parameters. The resultant data were subjected to multivariate techniques---Principal Component Analysis （PCA） and Canonical Correspondence Analysis （CCA）. Analyses of water parameters with PCA revealed that the first PC axis （PC 1） accounts for maximum variance in the seasonal data, explaining a variability of 91%. The PCA revealed that the seasonal variability in water parameters was due to the wet and dry cycle of seasons and the stations were distinguished on the basis of transparency and turbidity. Zooplankton abundance was dominated by copepods followed by cladocerans. Temporally, abundance of copepods reached a maximum during Post-monsoon （POM）（3 880 ind./L）. Spatially, $6 was found to be most abundant of the other stations in zooplankton. Copepodites and nauplii larvae were the major components of zooplankton. The Rotifera were the least abundant among the three zooplankton groups. Brachionus formed the major component of Rotifera zooplankton at all the stations during the study period. In the Cladocera, Macrothrix was present during all the four seasons, while Pleuroxus, Oxyurella, Kurzia and, Diaphanosoma were rare. The CCA shows that maximal temporal variability in zooplankton abundance was explained by temperature and rainfall. AnOVA revealed no significant difference in mean zooplankton abundance among the seasons, but there was a statistically significant difference among the sites.

关键词： zooplankton Principal Component Analysis (PCA) Canonical Correspondence Analysis (CCA) abundance Loktak Lake

Exploring the role of n-acetyltransferases in diseases:a focus on n-acetyltransferase 9 in neurodegeneration

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neural Regeneration Research 2025年第10期20卷 2862-2871页

作者： Prajakta Deshpande Anuradha Venkatakrishnan Chimata Amit singh Department of Biology University of DaytonDaytonOHUSA Premedical Program University of DaytonDaytonOHUSA Center for Tissue Regeneration and Engineering at Dayton(TREnD) University of DaytonDaytonOHUSA Integrative Science and Engineering Center University of DaytonDaytonOHUSA Center for Genomic Advocacy(TCGA) Indiana State UniversityTerre HauteINUSA

Acetyltransferases,required to transfer an acetyl group on protein are highly conserved proteins that play a crucial role in development and *** acetylation is a common post-translational modification pivotal to basic cellular *** to 80%-90%of proteins are acetylated during translation,which is an irreversible process that affects protein structure,function,life,and *** this review,we have discussed the various n-acetyltransferases present in humans,their function,and how they might play a role in ***,we have focused on n-acetyltransferase 9 and its role in microtubule *** have shed light on how n-acetyltransferase 9 and acetylation of proteins can potentially play a role in neurodegenerative *** have specifically discussed the n-acetyltransferase 9-acetylation independent function and regulation of c-Jun n-terminal kinase signaling and microtubule stability during development and neurodegeneration.

关键词： acetyl-coenzyme A Alzheimer’s disease animal models cell death drosophila eye human disease c-Jun n-terminal kinase signaling n-Acetyltransferases n-acetyltransferase 9 neurodegeneration

Evaluation of groundwater quality using pollution index of groundwater(PIG) and non-carcinogenic health risk assessment in part of the Gangetic Basin

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Acta Geochimica 2021年第3期40卷 419-440页

作者： Apoorv Verma n.B.singh Environmental Science and Engineering Civil Engineering DepartmentInstitute of Engineering and TechnologyDr.A.P.J.Abdul Kalam Technical UniversityLucknow 226021India Harcourt Butler Technical University Kanpur 208002India

The aim of this study was to evaluate groundwater fitness for domestic and irrigational use in Unnao district of Uttar Pradesh,*** this study,block wise(n=16)groundwater samples were collected,and measured parameters were analyzed using the pollution index of groundwater(PIG),various irrigational indices,and graphical *** results of this study suggested that most of the parameters were within the prescribed limits of WHO and BIS,excluding F-(0.4 to 2.6 mg L^(-1))and Fe^(2+)(0.1 to 1.7 mg L^(-1)).Concentrations of total dissolved solids(TDS)were exceeded the desirable limit(>500 mg L^(-1))in 43.75%of samples at some *** Gibbs plot revealed that groundwater chemistry was governed by rock-water interaction in the region,especially silicate *** Piper plot suggested that Ca^(2+)-HCO3-is dominant hydrochemical facies in the area followed by mixed Ca^(2+)-na^(+)-HCO_(3)^(-)type,na^(+)-Cl^(-)type,and na^(+)-HCO_(3)^(-)*** evaluation revealed that the contribution of F-and Fe2+in groundwater degradation is high in comparison to other elements in the region,about 18.75%samples showed low pollution,while about 6.25%samples shows moderate pollution,and 6.25%samples reflected high *** human health risk(HHR)assessment finding suggested that children(mean:1.36)are more vulnerable than adults(mean:1.01).Sodium absorption ration(SAR),Residual sodium carbonate(RSC),and Permeability index(PI)indicated that most of the groundwater was suitable for irrigation,whereas,Magnesium hazard ration(MHR)and Potential salinity(PS)indices suggested that only 37.5%and 56.25%of the samples were suitable for irrigational use,*** regional study would help in decision making for stakeholders and relevant authorities in the execution of groundwater management and remediation plans in the area.

关键词： Groundwater Pollution index of groundwater Irrigational indices Silicate weathering Human health risk

Coal fy ash:an emerging material for water remediation

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International Journal of Coal Science & Technology 2022年第3期9卷 18-49页

作者： n.B.singh Anupam Agarwal Anindita De Pragya singh Department of Chemistry and Biochemistry Sharda UniversityGreater NoidaIndia

Coal fy ash(CFA)is a byproduct of thermal power plant and collected from fue gases by *** of CFA depends on the type of coal used and it has both crystalline and amorphous *** is considered to be an environmental pollutant and used in number of *** is a useful material and widely used in cement production and as a promising adsorbent for water *** used for remediation of wastewater solves problems related to water quality issues and waste *** physical properties such as porosity,surface area,morphology,and chemical composition(iron oxide,alumina,silica,titania,etc.)make CFA efcient material for wastewater *** is also converted to geopolymer,which is used as an adsorbent and ***,organic compounds,toxic heavy metal ions,*** been removed using CFA and modifed CFA *** adsorption efciencies have been reported for diferent adsorbate and CFA *** of adsorption isotherm and kinetic models have been discussed.

关键词： Coal fy ash Adsorbent Dye Geopolymer Water remediation Pollutants

Stability investigation of road cut slope in basaltic rockmass,Mahabaleshwar,India

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Geoscience Frontiers 2015年第6期6卷 837-845页

作者： Ashutosh Kainthola P.K.singh T.n.singh Department of Earth Sciences Indian Institute of Technology Bombay

Slope failures along hill cut road slopes are the major nuisance for commuters and highway planners as they put the human lives at huge risk,coupled with immense monetary *** of these vulnerable cut slopes entails the assessment and estimation of the suitable material strength input parameters to be used in the numerical models to accomplish a holistic stability *** the present study a 60 m high,basaltic and lateritic road cut hill slope in Mahabaleshwar,India,has been considered.A number of samples of both basalt and laterite,in their natural state were tested in the laboratory and the evaluated maximum,minimum and mean strength parameters were employed for the three cases in a distinct element numerical *** Mohr-Coulomb failure criterion has been incorporated in the numerical model for the material as well as the *** numerical investigation offered the factor of safety and insights into the probable deformational mechanism for the three ***,several critical parameters have also been judged from the study viz.,mode of failure,factor of safety,shear strain rate,displacement magnitudes *** result of this analysis shows that the studied section is prone to recurrent failures due to the capping of a substantially thick layer of weaker lateritic material above the high strength basaltic rock *** triggering mechanisms like heavy precipitation and earthquake may also accelerate the slope failure in this *** study also suggests employing instant preventive measures to avert the further risk of damage.

关键词： Slope stability UDEC Basalt Mahabaleshwar Road cut

numerical assessment of spacing–burden ratio to effective utilization of explosive energy

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International Journal of Mining Science and Technology 2015年第2期25卷 291-297页

作者： Sazid Mohd singh T.n. Mining Engineering Department King Abdulaziz University Department of Earth Sciences Indian Institute of Technology-Bombay

The spacing–burden(S/B) ratio plays significant role on rock fragmentation and proper utilization of explosive energy to minimize the undesirable *** S/B ratio generates fine fragments due to pressure rings coalescence of two blast holes,whereas boulder generations were observed above optimum S/B *** conditions are not acceptable because of wastage of explosive ***,to resolve this issue,a numerical model study was conducted to optimize the S/B ratio and to envisage its effect on rock fragmentation based on utilization of explosive *** element simulation tool was used to see the extent of two blast hole influence area variation with varying S/B *** better results were obtained at S/B ratio of 1:2 with optimum utilization of peak explosive *** performance was observed based on peak kinetic energy,peak pressure,radial and hoop stresses on centre of the two blast holes,where pressure rings coalescence.

关键词： Rock blasting Spacing-burden ratio (S/B)Rock fragmentation numerical modelling Pressure rings

Study on changes in bed characteristics and friction factor in the presence of wash load in suspension

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International Journal of Sediment Research 2014年第4期29卷 501-508页

作者： n.K.KHULLAR Jaspal singh Department of Civil Engineering PAU Ludhiana-141004 Prof.-cum Head

Results of an experimental study on the effects of different concentrations of wash load on the size of bed features and resistance to flow in a laboratory flume are *** experiments were carried out under different hydraulic conditions in a 30 m long,0.204 m wide and 0.5 m deep tilting flume under clear water condition and in the presence of different concentration of wash load in the *** bed material used consisted of uniform sediment of size 0.96 *** of the data indicates that the characteristics of the bed features change and friction factor increases in the presence of different concentration of wash load in the *** reasons for changes in the characteristics of the bed features and increase in friction factor in the presence of wash load are identified and a relationship for predicting friction factor in the presence of wash load has been established.

关键词： Flow resistance Friction Factor Suspended load Wash load Bed characteristics Form resistance Grain resistance

Dopingless impact ionization MOS(DL-IMOS)—a remedy for complex process flow

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Journal of Semiconductors 2015年第7期36卷 50-58页

作者： Sangeeta singh P.n.Kondekar Department of Electronics and Communication Engineering PDPM-Indian Institute of Information TechnologyDesign and Manufacturing (IIITDM) Jabalpur JabalpurMPIndia

We propose a unique approach for realizing dopingless impact ionization MOS （DL-IMOS） based on the charge plasma concept as a remedy for complex process flow. It uses work-function engineering of electrodes to form charge plasma as surrogate doping. This charge plasma induces a uniform p-region in the source side and an n-region in the drain side on intrinsic silicon film with a thickness less than the intrinsic Debye length. DL-IMOS offers a simple fabrication process flow as it avoids the need of ion implantation, photo masking and complicated thermal budget via annealing devices. The lower thermal budget is required for DL-IMOS fabrication enables its fabrication on single crystal silicon-on-glass substrate realized by wafer scale epitaxial transfer. It is highly immune to process variations, doping control issues and random dopant fluctuations, while retaining the inherent advantages of conventional IMOS. To epitomize the fabrication process flow for the proposed device a virtual fabrication flow is also proposed here. Extensive device simulation of the major device performance metrics such as subthreshold slope, threshold voltage, drain induced current enhancement, and breakdown voltage have been done for a wide range of electrodes work-function. To evaluate the potential applications of the proposed device at circuit level, its mixed mode simulations are also carried out.

关键词： impact ionization MOSFET (IMOS) dopingless work-function engineering Debye length drain induced current enhancement (DICE) random dopant fluctuations (RDF)