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Influence of cerium ions on structure-dependent magnetic properties of Ba-Sr m-type hexaferrite nanocrystals

Journal of Rare Earths 2024年第2期42卷 364-372,I0005页

作者： Ram A.Pawar sunil m.patange P.m.Dighe Sher Singh meena Abdullah GAl-Sehemi mehboobali Pannipara Santosh S.Jadhav Department of Physics ArtsCommerce and Science CollegeAhmednagar413711MaharashtraIndia Department of Physics Shri Krishna MahavidyalayaGunjotiDistOsmanabad413606MaharashtraIndia Padmashri Vikhe Patil College of Arts Science and CommercePravaranagarA/P.Loni(Kd)Tal.RahataDistAhmednagar413713MaharashtraIndia Solid State Physics Division Bhabha Atomic Research CentreMumbai400085MaharashtraIndia Department of Chemistry King Khalid UniversityAbha61413Saudi Arabia Department of Physics D.S.M's ArtsCommerce and Science CollegeJintur431509MaharashtraIndia

The present study is a systematic effort to investigate the structure-sensitive magnetic parameters of Ce^(3+) substituted Ba-Sr hexaferrite nanocrystals chemically formulated as Ba_(0.5)Sr_(0.5)Ce_(x)Fe_(12-x)O_(19) where x=0.0-0.2 with Δx=*** hexaferrite powders were prepared using the sol-gel self-ignition route and structurally characterized by means of powder X-ray diffraction and Fourier transform infrared *** creation of the m-type hexaferrite phase within the synthesized samples was revealed from the Rietveld refinement of the X-ray *** occurrence of a secondary phase of CeO_(2) was revealed within the hexaferrites for the substitution,x> *** refined X-ray diffraction data were utilized to compute the lattice parameters,X-ray density,and lattice parameter *** crystal structure plotted from the refined XRD data reveals the occupancy of the ions at different lattice *** XPS data of the hexaferrite were analyzed to confirm the oxidation states of the constituent *** nanocrystalline nature of the hexaferrites was revealed from the crystallite sizes calculated using Scherer's *** analysis of FTIR spectra confirms that only a fraction of Ce^(3+)accommodated in the lattice and the remaining Ce content reside in the form of the CeO_(2) *** morphology of the hexaferrites was analyzed from the FESEm profiles of the ferrite *** magnetic behavior study was performed by analyzing the Curie temperature,hysteresis loops,and hyperfine interactions by means of susceptibility,V.S.m,and mossbauer spectroscopy,*** hexaferrites with increasing coercivity,decreasing saturation magnetization,and decreasing Curie temperature are reported in the *** substituted Ce^(3+)ions inhibit the grain growth and create lattice imperfections giving rise to hexaferrites with tuned magnetic parameters suitable for different applications.

关键词： Ba-Sr hexaferrite Ce^(3+)substitution XPS Saturation magnetization Coercivity m?ssbauer spectroscopy

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Role of composition and grain size in controlling the structure sensitive magnetic properties of Sm substituted nanocrystalline Co-Zn ferrites

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Journal of Rare Earths 2020年第10期38卷 1069-1075,I0002页

作者： Anil B.mugutkar Shyam K.Gore Umakant B.Tumberphale Vijaykumar V.Jadhav Rajaram S.mane sunil m.patange Sagar E.Shirsath Santosh S.Jadhav Bahirji Smarak mahavidyalaya Basmath431512MaharashtraIndia microwave Research Laboratory N.E.S.Science CollegeNanded431601MaharashtraIndia Dnyanopasak Shikshan mandal's Arts Commerce and Science CollegeJintur431509MaharashtraIndia Guangdong Technion Israel Institute of TechnologyShantou 515006China Department of Physics Shivaji MahavidyalayaUdgir-413517MaharashtraIndia School of Physical Sciences Swami Ramanand Teerth Marathwada UniversityNanded431606MaharashtraIndia Shri Krishna mahavidyalaya Gunjoti413613MaharashtraIndia School of materials Science and Engineering University of New South WalesSydney2052NSWAustralia

The nanocrystalline samarium substituted Co-Zn ferrites with chemical formula Co0.7Zn0.3SmyFe2-yO4(where y=0,0.01,0.02,0.03,0.04) were synthesized by sol-gel autocombustion *** analysis of Xray diffractograms(XRD) reveals the formation of cubic spinel *** planes indexed from XRD analyses were confirmed in the selected area electron diffraction(SAED) image of the *** nature of the particles in the ferrite samples was confirmed by *** morphology was analyzed by scanning electron microscopy(SEm).magnetic measurements show an increase in the magnetization for x ≤*** decrease in magnetization due to spin canting is observed for x=*** coercivity depends on Sm3+doping concentration,grain size and saturation *** complex permeability of the ferrites was analyzed as the function of frequency and Sm3+composition(y).The real part of complex permeability varies linearly with the grain size.

关键词： Nanocrystalline ferrites Rietveld refinement HRTEm magnetization Coercivity Permeability

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Study of plasma parameters of coaxial plasma source using triple Langmuir probe and Faraday cup diagnostics

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Plasma Science and Technology 2024年第4期26卷 94-100页

作者： sunil KANCHI Rohit SHUKLA Archana SHARmA Pulsed Power and Electromagnetics Division Bhabha Atomic Research CentreVisakhapatnam 531011India Homi Bhabha National Institute Mumbai 400085India Beam Technology Development Group Bhabha Atomic Research CentreMumbai 400085India

Coaxial plasma guns are a type of plasma source that produces plasma which propagates radially and axially controlled by the shape of the ground electrode, which has attracted much interest in several applications. In this work, a 120° opening angle of CPG nozzle is used as a plasma gun configuration that operates at the energy of 150 J. The ionization of polyethylene insulator between the electrodes of the gun produces a cloud of hydrogen and carbon *** triple Langmuir probe and Faraday cup are used to measure plasma density and plasma temperature. These methods are used to measure the on-axis and off-axis plasma divergence of the coaxial plasma gun. The peak values of ion densities measured at a distance of 25 mm on-axis from the plasma gun are(1.6±0.5)×10^(19)m^(-3)and(2.8±0.6)×10^(19)m^(-3)for hydrogen and carbon plasma respectively and the peak temperature is 3.02±0.5 eV. The mean propagation velocity of plasma is calculated using the transit times of plasma at different distances from the plasma gun and is found to be 4.54±0.25 cm/μs and 1.81±0.18 cm/μs for hydrogen and carbon plasma respectively. The Debye radius is obtained from the measured experimental data that satisfies the thin sheath approximation. The shot-to-shot stability of plasma parameters facilitates the use of plasma guns in laboratory experiments. These types of plasma sources can be used in many applications like plasma opening switches, plasma devices, and as plasma sources.

关键词： coaxial plasma source triple Langmuir probe Faraday cup plasma density plasma temperature

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Automatic Rule Discovery for Data Transformation Using Fusion of Diversified Feature Formats

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Computers, materials & Continua 2024年第7期80卷 695-713页

作者： G.sunil Santhosh Kumar m.Rudra Kumar Department of CSE Jawaharlal Nehru Technological UniversityAnantapur515002India Department of CSE Marri Laxman Reddy Institute of Technology and ManagementHyderabad500043India Department of Information Technology Mahatma Gandhi Institute of TechnologyHyderabad500075India

This article presents an innovative approach to automatic rule discovery for data transformation tasks leveraging XGBoost,a machine learning algorithm renowned for its efficiency and *** framework proposed herein utilizes the fusion of diversified feature formats,specifically,metadata,textual,and pattern *** goal is to enhance the system’s ability to discern and generalize transformation rules fromsource to destination formats in varied ***,the article delves into the methodology for extracting these distinct features from raw data and the pre-processing steps undertaken to prepare the data for the *** sections expound on the mechanism of feature optimization using Recursive Feature Elimination(RFE)with linear regression,aiming to retain the most contributive features and eliminate redundant or less significant *** core of the research revolves around the deployment of the XGBoostmodel for training,using the prepared and optimized feature *** article presents a detailed overview of the mathematical model and algorithmic steps behind this ***,the process of rule discovery(prediction phase)by the trained XGBoost model is explained,underscoring its role in real-time,automated data *** employingmachine learning and particularly,the XGBoost model in the context of Business Rule Engine(BRE)data transformation,the article underscores a paradigm shift towardsmore scalable,efficient,and less human-dependent data transformation *** research opens doors for further exploration into automated rule discovery systems and their applications in various sectors.

关键词： XGBoost business rule engine machine learning categorical query language humanitarian computing environment

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Tribological properties of Al-GNP composites at elevated temperature

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Friction 2024年第5期12卷 1028-1041页

作者： sunil POUDEL Rizwan BAJWA Yongde XIA Zakir KHAN Yi ZHANG Yanqiu ZHU College of Engineering Mathematics and Physical SciencesUniversity of ExeterExeterEX44QFUK European Technical Centre Daido Metal Co.Ltd.Iliminster SomersetTA199PHUK

Lighter and more powerful next generation vehicles and other rotary machinery demand bearings to operate in harsher conditions for higher efficiency,and the continuous development of advanced low-wear and friction materials is thus becoming even more important to meet these *** aluminium composites reinforced with high performance lubricate phases such as graphene nanoplatelets(GNPs)are very promising and have been vigorously *** maintaining a low coefficient of friction(COF)and offering great strength against wear due to their self-lubricating capability,the solid lubricant like GNPs protect the bearing surface from wear damage and prevent change in metallurgical properties during temperature *** paper first studies the high-temperature tribological performance of aluminium matrix composites reinforced with GNP,consolidated via powder metallurgy,then elucidates their tribological *** report that the best tribological performance is achieved by the composite containing 2.0 wt%GNP,with an extraordinarily low COF of 0.09 and a specific wear rate of 3.5×10^(−2)mm^(3)·N^(−1)·m^(−1),which represent 75%and 40%reduction respectively,against the plain aluminium consolidated under identical *** in-track and out-of-track Raman analysis have confirmed the role of GNPs in creating a tribofilm on the counterpart surface which contributed to the excellent performance.

关键词： nanocomposite graphene nanoplatelet(GNP) tribology powder metallurgy

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Challenges with non-descriptive compliance labeling of end-stage renal disease patients in accessibility for renal transplantation

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World Journal of Nephrology 2024年第1期13卷 9-13页

作者： Benjamin Peticca Tomas m Prudencio Samuel G Robinson sunil S Karhadkar Department of Surgery Lewis Katz School of Medicine at Temple University HospitalPhiladelphiaPA 19140United States

Non-descriptive and convenient labels are uninformative and unfairly project blame onto *** language clinicians use in the Electronic medical Record,research,and clinical settings shapes biases and subsequent behaviors of all providers involved in the enterprise of *** such as noncompliant and nonadherent serve as a reason for waitlist inactivation and limit access to life-saving *** labels fail to capture all the circum-stances surrounding a patient’s inability to follow their care regimen,trivialize social determinants of health variables,and bring unsubstantiated subjectivity into decisions regarding organ ***,insufficient medicare coverage has forced patients to ration or stop taking medication,leading to allograft failure and their subsequent diagnosis of *** argue that perpetuating non-descriptive language adds little substantive information,in-creases subjectivity to the organ allocation process,and plays a major role in reduced access to *** patients with existing barriers to care,such as racial/ethnic minorities,these effects may be even more *** committees must ensure thorough documentation to correctly encapsulate the entirety of a patient’s position and give voice to an already vulnerable population.

关键词： End-stage renal disease Compliance Labeling Social determinants

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A review on developing high-performance ZE41 magnesium alloy by using bulk deformation and surface modification methods

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Journal of magnesium and Alloys 2023年第3期11卷 776-800页

作者： Subrat Kumar Baral manjusha m.Thawre B.Ratna sunil Ravikumar Dumpala Department of mechanical Engineering Visvesvaraya National Institute of TechnologyNagpur 440010India Department of metallurgical and materials Engineering Visvesvaraya National Institute of TechnologyNagpur 440010India Department of mechanical Engineering Bapatla Engineering CollegeBapatla 522102India

magnesium(mg)alloys are generally used in light-weight structural applications due to their higher specific ***,the usage of these mg alloys is limited due to their poor formability at room temperature,which is attributed to lower count of slip systems associated with the hcp crystal *** address these limitations,several new magnesium alloys and also many processing strategies have been developed and reported in the ***41 mg is an alloy with significant quantities of zinc(Zn)and rare earth(RE)elements and has emerged as a promising material for aerospace,automotive,electronics,biomedical and many other *** make this alloy more competitive and viable,it should possess better mechanical and corrosion ***,the current paper reviews the effect of bulk mechanical processing on grain refinement,microstructural modification,and corresponding changes in the mechanical behaviour of ZE41mg ***,the effect of various surface modification techniques on altering the surface microstructure and surface properties such as wear and corrosion are also briefly summarized and *** review also discusses the challenges and the future perspectives in developing high-performing ZE41 mg alloys.

关键词： ZE41 magnesium alloy Bulk deformation Surface modification mechanical properties Wear Corrosion

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Introduction to the Special Issue on mathematical Aspects of Computational Biology and Bioinformatics

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Computer modeling in Engineering & Sciences 2023年第7期136卷 1-3页

作者： Dumitru Baleanu Carla m.A.Pinto sunil Kumar Department of mathematics Cankaya UniversityBalgatAnkara06530Turkey Institute of Space Sciences Magurele-Bucharest077125Romania ISEP Instituto Superior de Engenharia do PortoRua Dr.António Bernardino de AlmeidaPorto4314249-015Portugal Department of mathematics National Institute of TechnologyJamshedpurJharkhand831014India

The special issue presents new mathematical and computational approaches,to investigate some core problems of the computational biological *** topic presents a huge interest from both theoretical and applied *** content of this special issue was focused mainly to debate a wide range of the theory and applications of integer-order and fractional-order derivatives and fractional-order integrals in different directions of mathematical *** interdisciplinary groups reported their related results.

关键词： fractional integer mathematical

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Embedding in Anisotropic Spheres

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Research in Astronomy and Astrophysics 2022年第4期22卷 62-70页

作者： Alberto K.mathias sunil D.maharaj Jefta m.Sunzu Jason m.mkenyeleye Department of mathematics and Statistics The University of DodomaP.O.Box 338DodomaTanzania Astrophysics Research Centre School of MathematicsStatistics and Computer ScienceUniversity of KwaZulu-NatalDurban 4000South Africa

Exact solutions to the Einstein field equations for class I spacetime symmetry in relativistic stars are *** symmetry provides a relation between the gravitational potentials that lead to generalized solutions of the Einstein field *** choose one of the gravitational potentials on a physical basis,which allows us to obtain the other gravitational potential via an embedding *** is therefore possible to generate a model with astrophysical *** model generated satisfies physical properties like stability,causality,regularity,equilibrium and energy conditions.

关键词： gravitation astroparticle physics relativistic processes

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CFD analysis for mixing performance of different types of household biodigesters

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Clean Energy 2022年第2期6卷 325-334页

作者： Sagar Shrestha sunil Prasad Lohani Renewable and Sustainable Energy Laboratory Department of Mechanical EngineeringKathmandu UniversityNepal

Household biodigesters are self-mixing anaerobic digesters used mostly in rural areas of developing countries as a reliable source of clean cooking *** an efficient anaerobic digestion process,the mixing of slurry inside the digester is regarded as one of the most important *** this study,the mixing of slurry in three different designs of household digesters,namely the fixed-dome digester(GGC 2047 model),plug-flow digester and prefabricated plastic digester,are investigated and compared using compu-tational fluid dynamics.A 3D transient simulation is performed using a multiphase volume of fluid(VOF)model in Ansys^(■)Fluent release *** rheological properties of the feedstock are considered identical for all three *** volume of the plug-flow and prefabricated plastic digesters is designed to be 1 m^(3) while the volume of the GGC 2047 digester was 6 m^(3) as the standard size of the household *** regions inside the digester where the velocity of slurry ism/s are regarded as dead zones and the obtained results were analysed and compared using velocity patterns and dead-zone *** is found that the prefabricated plastic digester model has a relatively higher percentage of dead volume(74.6%)and the plug-flow digester has the lowest per-centage(54%)of dead volume among digesters that were compared in this *** study will serve as the basis for designers and researchers to improve the design of household digesters for better mixing performances.

关键词： household biodigesters dead zone CFD anaerobic digestion mixing biomass Ansys Fluent

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