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Structural and Ion Transport Studies in (100-x) PVdF + xNH<sub>4</sub>SCN Gel Electrolyte

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Materials Sciences and Applications 2011年第7期2卷 721-728页

作者： kamlesh pandey Mrigank Mauli Dwivedi Nidhi Asthana Markandey Singh Shanker Lal Agrawal 不详

In order to obtain highly conductive polymer gel electrolytes for electrochemical devices, Poly (vinylidene fluoride) (PVdF) based gel electrolytes namely (100–x)PVdF + xNH4SCN electrolyte system has been synthesized by solution cast technique and characterized by XRD, DSC, IR, SEM and electrical measurements. IR study of gel electrolytes shows interaction of PVdF matrix and dopant salt with prominence of α-phase. This result is also well supported by XRD and DSC studies. The electrolytes are electrochemically stable within ± 1.5 V. The optimum bulk electrical conductivity for 90PVdF + 10NH4SCN electrolyte has been found to be ~ 2.5 × 10–2 S●cm–1. Dielectric relaxation behavior shows low frequency dispersion and αc-related relaxation peak is observed in loss spectra. Polarization behavior of gel electrolyte shows ionic nature of charge transport (Tion. > 0.90). The temperature dependent conductivity shows VTF behavior.

关键词： Poly (Vinylidene Fluoride) Gel Electrolyte Ion Transport Dielectric Relaxation Structural Studies

Landslide Susceptibility Mapping Using RBFN-Based Ensemble Machine Learning Models

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 467-500页

作者： Landslide Susceptibility Mapping Using RBFN-Based Ensemble Machine Learning Models Duc-Dam Nguyen Nguyen Viet Tiep Quynh-Anh Thi Bui Hiep Van Le Indra Prakash Romulus Costache Manish pandey Binh Thai Pham Faculty of Civil Engineering University of Transport TechnologyThanh XuanHa Noi100000Vietnam Faculty of Hydraulic Engineering Hanoi University of Civil EngineeringHa Noi100000Vietnam DDG(R)Geological Survey of India Gandhinagar382010India Research Institute of the University of Bucharest Bucharest050663Romania National Institute of Hydrology and Water Management Bucharest013686Romania Department of Civil Engineering Transilvania University of BrasovBrasov500152Romania Danube Delta National Institute for Research and Development Tulcea820112Romania Marwadi University Research Center(MURC) Marwadi UniversityRajkotGujaratBharat360003India Department of Civil Engineering Faculty of Engineering&TechnologyMarwadi UniversityRajkotGujaratBharat360003India

This study was aimed to prepare landslide susceptibility maps for the Pithoragarh district in Uttarakhand,India,using advanced ensemble models that combined Radial Basis Function Networks(RBFN)with three ensemble learning techniques:DAGGING(DG),MULTIBOOST(MB),and ADABOOST(AB).This combination resulted in three distinct ensemble models:DG-RBFN,MB-RBFN,and ***,a traditional weighted method,Information Value(IV),and a benchmark machine learning(ML)model,Multilayer Perceptron Neural Network(MLP),were employed for comparison and *** models were developed using ten landslide conditioning factors,which included slope,aspect,elevation,curvature,land cover,geomorphology,overburden depth,lithology,distance to rivers and distance to *** factors were instrumental in predicting the output variable,which was the probability of landslide *** analysis of the models’performance indicated that the DG-RBFN model,with an Area Under ROC Curve(AUC)of 0.931,outperformed the other *** AB-RBFN model achieved an AUC of 0.929,the MB-RBFN model had an AUC of 0.913,and the MLP model recorded an AUC of *** results suggest that the advanced ensemble ML model DG-RBFN was more accurate than traditional statistical model,single MLP model,and other ensemble models in preparing trustworthy landslide susceptibility maps,thereby enhancing land use planning and decision-making.

关键词： Landslide susceptibility map spatial analysis ensemble modelling information values(IV)

Fe–EBT Chelate Complex: A Novel Mean for Growth of α-FeOOH and γ-Fe_2O_3 Nanostructures

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Acta Metallurgica Sinica(English Letters) 2014年第6期27卷 1127-1133页

作者： Gajanan pandey Department of Applied Chemistry Babasaheb Bhimrao Ambedkar University

Acicular goethite（a-Fe OOH） and worm-like maghamite（γ-Fe2O3） nanostructures have been prepared adopting a novel route, using Na2[Fe（HL）2（H2O）2] chelate complex in alkaline medium. It is found that concentration of hydrated Fe（III） ions increased with increasing temperature, which later play a key role in generation of different phases of iron oxide. Phase and morphology of the products are investigated using XRD, FTIR, SEM, and TEM analysis. Using UV–Vis spectra, various electronic transitions of goethite and maghamite particles are examined. Maghamite nanostructures exhibit superparamagnetic property at room temperature. On the basis of experimental observations and analytical data, growth mechanism of the nanostructures is discussed.

关键词： Iron oxide Nanostructures Chemical synthesis Growth mechanism Magnetic properties

In situ synthesis of Ag-SiO_2 Janus particles with epoxy functionality for textile applications

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Particuology 2015年第2期13卷 107-112页

作者： kamlesh Panwar Manjeet Jassal Ashwini K.Agrawal SMITA Research Labs Department of Textile TechnologyIndian Institute of Technology

A facile method for the synthesis of silver-silica （Ag-SiO2）Janus particles with functionalities suitable for textile applications is reported. Silica nanoparticles prepared by the StOber method were functionalized with epoxy, amine, and thiol groups, which were confirmed by Fourier transform infrared analysis. The functionalized silica nanoparticles were used to produce Pickering emulsions, and the exposed surface was used for the attachment of silver nanoparticles （AgNPs） via the low-temperature chemical reduction method. The morphology and structure of the Ag-SiO2 Janus particles were characterized by scanning electron microscopy, scanning transmission electron microscopy, high-resolution transmission electron microscopy, energy-dispersive X-ray analysis, and UV-vis spectroscopy. Because of their specific functionalities, these Ag-SiO2 Janus particles are proposed for applications on textile substrates, as they can overcome several drawbacks of direct application of AgNPs on textiles, such as leaching, agglomeration, and instability during storage.

关键词： Ag-SiO2 Janus particles Picketing emulsion Textile applications

A generalization of Poisson-Sujatha distribution and its applications to ecology

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International Journal of Biomathematics 2019年第2期12卷 37-47页

作者： Rama Shanker kamlesh Kumar Shukla Department of Statistics College of Science Eritrea Institute of TechnologyAsmaraEritrea

A generalization of Poisson Sujatha distribution(AGPSD),which includes Poisson-Lindley distribution(PLD)and Poisson-Sujatha distribution(PSD)as particular cases,has been proposed and *** moments and moments-based measures including coefficient of variation,skewness,kurtosis and index of dispersion have been obtained and their behaviors have been *** estimation of its parameters has been discussed with maximum likelihood *** applications of the proposed distribution has been explained through two examples of count data from ecology and the goodness of fit of the distribution has been compared with Poisson distribution,PLD and PSD.

关键词： Sujatha distribution Poisson-Sujatha distribution generalization of Sujatha distribution moments and moments-based measures maximum likelihood estimation applications

Progress on Medical Implant:A Review and Prospects

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Journal of Bionic Engineering 2023年第2期20卷 470-494页

作者： Ankur pandey Swagatadeb Sahoo Department of Electronics and Communication Engineering National Institute of Technology JamshedpurJamshedpurJharkhand831014India

Medical implant from different materials such as metals,ceramics,polymers and composites have gained a lot of research attraction due to wide applications in medical industry for treatment,surgical operations and preparing artificial body *** this work,we highlight a comprehensive review of medical implant mechanism,various types of implant materials,factors affecting the performance of implant and different characterization *** review provides an overall summary of the state-of-the-art progress on various interesting and promising material-based medical ***,few new prospects are explained from the established theoretical and experimental results for real-life *** study is expected to promote extended interest of scientists and engineers in recent trend of modern biomaterials based medical implant.

关键词： Implant material Biocompatibility Hydroxyapatite Dielectric constant

Atmospheric pressure plasma-assisted green synthesis of amphiphilic SiO2 Janus particles

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Particuology 2017年第4期15卷 50-54页

作者： kamlesh Panwar Manjeet Jassal Ashwini K. Agrawal SMITA Research Lab Department of Textile Technology Indian Institute of Technology Delhi Hauz Khas New Delhi 11 O016 India

A facile green approach for the synthesis of amphiphilic SiO2 Janus particles using low temperature atmospheric pressure plasma is reported in this study. Monodispersed SiO2 particles were masked by embedding half of their surface inside a polystyrene film. The exposed surfaces of the SiO2 particles were readily modified using He/CF3 CFH2 low-temperature atmospheric pressure plasma to obtain amphiphilic Janus particles. Their amphiphilic nature was confirmed using fluorescent microscopy by tagging their hydrophilic part with a fluorescent dye. The present method can be used to generate amphiphilic Janus particles with a variety of functionalities, which may find applications as surfactants and surface modifying agents.

关键词： Hydrophilic Hydrophobic SiO2 FITC Atmospheric pressure plasma

Microstructural Features of Spray-Deposited Immiscible Bearing Alloys Al-43Sn and Al-7Sn-1.3Cu-1.3Ni

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Journal of Materials Science & Technology 2003年第5期19卷 437-443页

作者： O.P.pandey Thapar Institute of Engineering & Technology Deemed University Patiala-147004 India

Two commercial grade aluminum based immiscible bearing alloys were spray-deposited using convergent-divergent type of nozzle. The processing parameters for spray-deposition were adjusted in such a way that most of the droplets arrived on the deposition substrate in either liquid or semi-liquid state. The microstructural features of spray-formed and as-cast alloys are compared. In spray-formed alloys equiaxed grains were observed. The cell boundaries and intercellular regions were observed to be decorated with sub-micron sized particles whereas in normal casting the second phase was observed to be segregated along grain boundaries. The morphology and distribution of second phase were observed to have similarity with those in over-spread and atomized powders produced under similar processing conditions. The microstructural features observed with variation in spray conditions are discussed in detail.

关键词： Spray deposition Immiscible bearing alloys Microstructure Atomization

Effect of different synthesis techniques on structural, magnetic and magneto-transport properties of Pr_(0.7)Sr_(0.3)MnO_3 manganite

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Journal of Rare Earths 2010年第5期28卷 760-764页

作者： Umesh Chand kamlesh Yadav Anurag Gaur Varma G D Department of Physics Indian Institute of Technology Department of Physics National Institute of Technology

We investigated the effect of different synthesis techniques on the structural, magnetic and magneto-transport properties of Pr0.7Sr0.3MnO3 (PSMO) samples. The samples were synthesized by three different techniques: solid state reaction, sol-gel and chemical Co-precipitation method. XRD studies confirmed the single phase formation of PSMO by all three techniques. It was also found that the magnetotransport properties of PSMO strongly depended on the synthesis techniques. A substantial decrease in the insula...

关键词： magnetoresistance electrical transport grain boundary rare earths