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Sm^(3+)induced structural phase transition,spectral,morphological,magnetic,dielectric and impedance properties of Ni_(0.1)Cu_(0.9)Sm_(x)Fe_(2-x)O_(4) nanoferrites

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Journal of Rare Earths 2023年第11期41卷 1736-1745,I0003页

作者： k.Rajashekhar G.vinod k.Mahesh kumar G.Harikishan Laxman Naik J Department of Physics University College of ScienceOsmania UniversityHyderabad500007TelanganaIndia Department of Physics Kamala Institute of Technology and ScienceHuzurabad505468TelanganaIndia Department of Physics CMR College of Engineering&TechnologyHyderabad501401TelanganaIndia

In the present study,rare earth samarium(Sm^(3+))substituted Ni-Cu spinel ferrites with the composition of Ni_(0.1)Cu_(0.9)Sm_(x)Fe_(2-x)O_(4)(0≤x≤0.05 in steps of 0.01)were synthesized by using the citrate induced sol-gel auto combustion *** ferrites'structural,optical,magnetic,and dielectric studies were carried out using X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),field emission scanning electron microscopy(FESEM),ultraviolet-visible(UV-vis),a vibrational sample magnetometer(VSM),and an LCR *** pure Ni-Cu ferrite exhibits a tetragonal structure owing to the presence of the John Tellar ion(Cu^(2+)).XRD patterns confirm that the tetragonal structure gradually transforms into the cubic spinel structure with samarium *** nano-scale structures of these ferrites were confirmed by the average crystallite size(10.11-20.99 nm)derived from the X-ray diffraction patterns,and grain size(42.60-83.36 nm)assessed from FESEM *** existence of elements according to their chemical composition was verified by using energy dispersive X-ray(EDX)*** absorption bands(v_(1) and v_(2))detected in FTIR transmission spectra below the wavenumber of 600 cm^(-1)reveal the stretching vibrations of M-O bonds in the spinel structure at tetrahedral and octahedral *** band gap ene rgy obtained from UV absorption reveals the semiconducting nature of the *** high saturation magnetization(M_(s))is noticed at 15 k temperature for x=0.02 composition as 32.98 emu/g,while at 300 k for x=0.01composition as 27.61 emu/*** suggested cation distribution is in good agreement with observed and predicted magnetic moment values at 300 *** expected behavior of ferrites reveals the observed dielectric constant,loss tangent,and ac-conductivity values in the frequency range of 20 Hz-20 ***-Cole plots confirm that the impedance contribution is attributed to grain boundaries.

关键词： Nanoferrites XRD Magnetic properties Dielectric properties Cole-cole plots Rare earths

Discharge water temperature assessment of thermal power plantusing remote sensing techniques

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Energy Geoscience 2022年第2期3卷 172-181页

作者： Priyom Roy Ivaturi N.Rao Tapas Ranjan Martha k.vinod kumar Geosciences Group National Remote Sensing CentreISROHyderabadIndia Environment&Sustainability Coastal Gujarat Power LimitedMundraGujaratInd

Thermal power plants are generally constructed near to sea coast to meet their requirement of coolingwater. The warm water discharge from the thermal power plant is one of the major environmentalconcerns in view of the thermal pollution in the sea water. The temperature limit for the warm waterdischarge from the thermal power plant has to be monitored and controlled. Coastal Gujarat PowerLimited (CGPL) operates (24×7) at an “once-through system” based sea water circulation for powergeneration. The used sea water is then discharged into the sea through an outlet channel. As per environmental norms, the discharge water temperature needs to be maintained below the stipulated “delta”rise (+7 ℃) with respect to ambient sea surface temperature at the inlet. We demonstrate the applicability of thermal remote sensing data in understanding the seasonal and temporal variations of thetemperature difference between the discharge water and the ambient sea water. We used thermal banddata from Landsat-8 satellite imagery to map water surface temperature and create temperature profilesalong the intake and outflow channels (till the sea), to understand the variation of temperature andestimate the “DT” between intake point and various observation points along the outflow. This analysiswas carried out for all 11 months (except June) of the year 2018 to correlate temperature variations withseasonal changes. Tidal conditions during the time of data acquisition were also considered to accountfor the effect of tides on DT. The result shows that the average temperature rise between intake andoutflow are maintained at ~3 ℃ across all the months of 2018, with minor variations in the months ofJuly and August. Further, average temperature drop from outflow to cooling channel (before diaphragm)is seen to be ~2 ℃ across all the months with similar seasonal fluctuations.

关键词： Discharge water Thermal power plant Ambient temperature Landsat 8 Seawater pollution

A Positive Solution of Mixed Non-Linear Fractional Delay Differential Equations with Integral Boundary Conditions

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Journal of Mathematical Research with Applications 2023年第2期43卷 213-226页

作者： Dayanand k.VYAVAHARE vinod V.kHARAT Department of Mathematics Punyashlok Ahilyadevi Holkar Solapur University Department of Mathematics N.B.Navale Sinhgad College of Engineering

In this paper, we study mixed non-linear fractional delay differential equations with integral boundary conditions. We obtain an equivalence result between the proposed problem and non-linear Fredholm integral equation of the second kind. Further, we establish existence and uniqueness of positive solutions for the problem using Guo-krasnoseleskii’s fixed point theorem and Banach contraction principle.

关键词： Guo-krasnoseleskii’s fixed point theorem Banach contraction principle mixed nonlinear fractional delay differential equations integral boundary conditions existence uniqueness

Gate current modeling and optimal design of nanoscale non-overlapped gate to source/drain MOSFET

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Journal of Semiconductors 2011年第7期32卷 14-19页

作者： Ashwani k.Rana Narottam Chand vinod kapoor Department of Electronics and Communication National Institute of Technology Department of Computer Science and Engineering National Institute of Technology

A novel nanoscale MOSFET with a source/drain-to-gate non-overlapped and high-k spacer structure has been demonstrated to reduce the gate leakage current for the first *** gate leakage behaviour of the novel MOSFET structure has been investigated with the help of a compact analytical model and Sentaurus simulation. A fringing gate electric field through the dielectric spacer induces an inversion layer in the non-overlap region to act as an extended S/D（source/drain） *** is found that an optimal source/drain-to-gate non-overlapped and high-A：spacer structure has reduced the gate leakage current to a great extent as compared to those of an overlapped ***,the proposed structure had improved off current,subthreshold slope and drain induced barrier lowering（DIBL） *** is concluded that this structure solves the problem of high leakage current without introducing extra series resistance.

关键词： gate tunneling current analytical model spacer dielectrics DIBL subthreshold slope

Assessment of geodetic strain and stress variations in Nepal due to 25 April 2015 Gorkha earthquake:Insights from the GNSS data analysis and b-value

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Geodesy and Geodynamics 2022年第3期13卷 288-300页

作者： Sravanthi Gunti Priyom Roy J.Narendran Ramesh Pudi S.Muralikrishnan k.vinod kumar M.Subrahmanyam Y.Israel B.Satish kumar National Remote Sensing Centre Indian Space Research Organization(ISRO)BalanagarHyderabad500037India Sustainability Risk Management Solutions of IndiaNoida201301India Department of Geophysics Andhra UniversityVisakhapatnam530003India

A magnitude M;7.8 earthquake occurred on 25 April 2015(referred as Gorkha earthquake).We have analyzed the spatial variation of b-value and two-dimensional strain within Nepal Himalaya before and after the Gorkha *** have used continuous Global Navigation Satellite System(GNSS)data from 30 stations in the Nepal region for geodetic strain estimation and earthquake data for b-value *** GNSS data were processed using double differencing technique for the accurate position of each *** precise velocity vectors show a general azimuth of north east for all the stations and have been used to derive two-dimensional *** epicenters of Gorkha(25 April 2015)and Dolakha earthquakes(12 May 2015),we observed high co-seismic horizontal displacements(0.2 m to 2 m).In the Pre-seismic deformation study,maximum strain accumulation(56.40×10;)and low bvalue(0.79-0.89)was observed in and around the Western Nepal region,which may be responsible for the 2015 Gorkha *** potential seismic zones were identified by GIS based integration of geodetic strain and b-value map and superimposition using weighted overlay *** Maximum strain and low b-value are now observed in the eastern part of ***,the spatial disposition of elastic energy has changed after the two major earthquakes and continuous seismic hazard assessment is required in the eastern Nepal.

关键词： Himalaya Co-seismic offsets Bernese 5.2 UNAVCO Grid_Strain

Nonalcoholic Fatty Liver Disease in Lean/Nonobese and Obese Individuals:A Comprehensive Review on Prevalence,Pathogenesis,Clinical Outcomes,and Treatment

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Journal of Clinical and Translational Hepatology 2023年第2期11卷 502-515页

作者： Ankoor H.Patel Dhiraj Peddu Sahil Amin Mohamed I.Elsaid Carlos D.Minacapelli Toni-Marie Chandler Carolyn Catalano vinod k.Rustgi Department of Medicine Division of Gastroenterology and HepatologyRutgers Robert Wood Johnson Medical SchoolNew BrunswickNJUSA Center for Liver Diseases and Masses Rutgers Robert Wood Johnson Medical SchoolNew BrunswickNJUSA Department of Biomedical Informatics College of MedicineThe Ohio State UniversityColumbusOHUSA Secondary Data Core Center for BiostatisticsCollege of MedicineThe Ohio State UniversityColumbusOHUSA

Nonalcoholic fatty liver disease(NAFLD)is the most common liver disease worldwide,with an estimated prevalence of 25% *** is closely associated with metabolic syndrome,which are both becoming increasingly more common with increasing rates of insulin resistance,dyslipidemia,and *** NAFLD is strongly associated with obesity,lean or nonobese NAFLD is a relatively new phenotype and occurs in patients without increased waist circumference and with or without visceral ***,there is limited literature comparing and illustrating the differences between lean/nonobese and obese NAFLD patients with regard to risk factors,pathophysiology,and clinical *** this review,we aim to define and further delineate different phenotypes of NAFLD and present a comprehensive review on the prevalence,incidence,risk factors,genetic predisposition,and ***,we discuss and compare the clinical outcomes,such as insulin resistance,dyslipidemia,hypertension,coronary artery disease,mortality,and progression to nonalcoholic steatohepatitis,among lean/nonobese and obese NAFLD ***,we summarize the most up to date current management of NAFLD,including lifestyle interventions,pharmacologic therapies,and surgical options.

关键词： NAFLD Lean or nonobese nonalcoholic fatty liver disease Obese nonalcoholic fatty liver disease Clinical outcomes Treatment Incidence Prevalence Risk factors

Au, Ag and Au:Ag colloidal nanoparticles synthesized by pulsed laser ablation as SERS substrates

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Progress in Natural Science:Materials International 2014年第6期24卷 569-578页

作者： M.vinod k.G.Gopchandran Department of Optoelectronics University of Kerala

Chemically pure colloidal suspensions of gold and silver nanoparticles were synthesized using pulsed laser *** dependence of laser fl uence on the surface plasmon characteristics of the nanoparticles was ***:Ag colloidal suspensions were prepared by mixing highly monodisperse Au and Ag *** plasmon band of these mixtures was found to be highly sensitive to Au:Ag concentration ratio and wavelength of the laser beam used in the ablation *** Au:Ag mixture consists of almost spherical shaped nanostructures with a tendency to join with adjacent *** surface enhanced Raman scattering activity of the Au,Ag and Au:Ag colloidal suspensions was tested using crystal violet as probe *** in Raman signal obtained with Au:Ag substrates was found to be promising and strongly depends on its plasmon characteristics.

关键词： Laser ablation Au and Ag nanoparticles Nanocolloids Plasmon SERS Crystal violet

Traversing the advantageous role of samarium doped spinel nanoferrites for photocatalytic removal of organic pollutants

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Journal of Rare Earths 2021年第7期39卷 781-789,I0002页

作者： Sneha Singh Paramdeep kaur vinod kumar k.B.Tikoo Sonal Singhal Department of Chemistry Panjab UniversityChandigarh160014India HRTEM Facility Lab NIPERSA.S.NagarMohaliPunjab160062India

The present work reportes the pertinence of samarium(Sm) doped spinel nanoferrites as magnetically recoverable photocatalyst for the removal of organic pollutants from ***,a series of Sm substituted spinel nano ferrites,MSm_(x)Fe_(2-x)O_(4)(M=Ni,Co;x=0,0.02,0.06,0.1) we re synthesized via sol-gel *** effect of Sm doping on the structural,morphological,optical and magnetic properties of pristine nanoferrites was investigated ***,the fabricated samples were explored as photocatalysts for the oxidative degradation of antibiotics(ofloxacin and norfloxacin) and dyes(methyl orange and safranin O).The Sm doped nanoferrites exhibit astonishing catalytic efficacy that can be attributed to higher surface area,octahedral site preference of Sm ions and reduced band *** synthesized nanoferrites display excellent recyclability which enables them to be utilized as potential photocatalysts for wastewater treatment.

关键词： Samarium doped nanoferrites Sol-gel Pharmaceutical degradation Recyclability Rare earths

Damage and geological assessment of the 18 September 2011 M_w 6.9 earthquake in Sikkim,India using very high resolution satellite data

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Geoscience Frontiers 2015年第6期6卷 793-805页

作者： Tapas R.Martha k.Babu Govindharaj k.vinod kumar National Remote Sensing Centre(NRSC) Indian Space Research Organisation(ISRO)

Post-disaster very high resolution（VHR） satellite data are potential sources to provide detailed information on damage and geological changes for a large area in a short *** this paper,we studied landslides triggered by the M_w 6.9 earthquake in Sikkim,India which occurred on 18 September 2011 using VHR data from Cartosat-1,GeoEye-1,QuickBird-2 and WorldView-2 *** the earthquake-affected area is located in mostly inaccessible Himalayan terrain,VHR data from these satellites provided a unique opportunity for quick and synoptic assessment of the *** visual change analysis technique through comparison of pre- and post-earthquake images,we assessed the damage caused by the event.A total of 123 images acquired from eight satellites,covering an area of4105 km2 were analysed and 1196 new landslides triggered by the earthquake were *** blockages and severely affected villages were also *** assessment of the terrain highlighted linear disposition of landslides along existing fault scarps,suggesting a reactivation of *** landslide inventory map prepared from VHR images also showed a good correlation with the earthquake shake *** showed that several parts of north Sikkim,particularly Mangan and Chungthang,which are close to the epicentre,were severely affected by the earthquake,and that the event-based landslide inventory map can be used in future earthquake-triggered landslide susceptibility assessment studies.

关键词： International Charter Damage Landslide Fault VHR Disaster