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Electronic and magnetic properties at rough alloyed interfaces of Fe/Co on Au substrates: An augmented space study

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Chinese Physics B 2016年第5期25卷 298-304页

作者： Priyadarshini parida Biplab Ganguli Department of Physics & Astronomy National Institute of Technology Rourkela

We studied the interface electronic and magnetic properties of Fe/Co deposited on Au substrate and researched the effects of roughness at the interfaces within augmented space formalism （ASF）. The full calculation is carried out by recursion and tight-binding linear muffin tin orbital （TB-LMTO） methods. The amount of roughness is different at different atomic layers. The formalism is also applied to sharp interface, when interdiffusion of atoms is negligible. Our results of one monolayer transition metal agree with other reported results. A realistic rough interface is also modeled with three and four monolayers of transition metals, deposited on Au substrates.

关键词： augmented space formalism tight-binding linear muffin tin orbital rough interface magneticproperties

Analysis of some critical aspects in hot machining of Ti-5553 superalloy: Experimental and FE analysis

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Defence Technology（防务技术） 2019年第3期15卷 344-352页

作者： Asit Kumar parida Kalipada Maity Mechanical Engineering Department Indian Institute of Technology Delhi India National Institute of Technology Rourkela Mechanical Engineering Department India

In this study, a newly developed titanium superalloy, i.e., the Ti-5553 alloy has used for hot machining. This material replaced Ti-grade-5 alloy in the application of aerospace, automobile, and biomedical sector. However, similar to Ti-grade-5 alloy, the Ti-5553 alloy has a low thermal conductivity which makes it difficult-to-cut material categories hence, high tool wear, cutting force and bad surface finish. Hot machining of Ti-5553 has been studied at different machining condition (room and hot) using Deform-2D finite element analysis. The result from the simulation test was compared with the experimental value and reduction of cutting and thrust forces was observed. The experiment was carried out with the same input parameters as simulation, and good coherence between them observed. Additionally, cutting zone temperature, effective stress, etc. for both room and elevated the temperature are also discussed.

关键词： Ti-5553 Hot machining Cutting force Flank wear Finite element analysis

FEM analysis and experimental investigation of force and chip formation on hot turning of Inconel 625

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Defence Technology（防务技术） 2019年第6期15卷 853-860页

作者： Asit Kumar parida Kalipada Maity Indian Institute of Technology Delhi Department of Mechanical EngineeringIndia National Institute of Technology Rourkela Department of Mechanical EngineeringIndia

This study investigates the hot machining of Inconel 625 alloy by using flame heating under different machining conditions using finite element analysis(FEM).Turning tests are performed at different cutting speeds and heating temperatures using uncoated carbide insert by DEFORM *** reduction in cutting force and tool wear has achieved at heating conditions compared to room *** tool life is achieved at the highest cutting speed and higher heating temperature *** heating conditions of the 600℃ continuous chip is formed whereas at room temperature saw-tooth chip formation is observed.A significant agreement is achieved between simulated and experimental cutting forces and chip *** effect of feed rates and depth of cuts are also studied experimentally during turning of Inconel 625 in a systematic manner.

关键词： Hot machining Force Inconel 625 Surface roughness Chip morphology

Simultaneously enhanced efficiency and ambient stability of inorganic perovskite solar cells by employing tetramethylammonium chloride additive in CsPbI2Br

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Journal of Materials Science & Technology 2022年第7期102卷 224-231页

作者： In Su Jin Bhaskar parida Jae Woong Jung Department of Advanced Materials Engineering for Information and Electronics Kyung Hee University1732 Deogyeong-daeroGiheung-guYongin-siGyeonggi-do 446-701Republic of Korea Integrated Education Institute for Frontier Materials(BK21 Four) Kyung Hee University1732 Deogyeong-daeroGiheung-guYongin-siGyeonggi-do 446-701Republic of Korea

Although all-inorganic perovskites possess suitable bandgap and thermal stability for photovoltaic ap-plications,the unstable film morphologies,and poor moisture stabilities lag behind the organic-inorganic hybrid ***,we demonstrate that high qualityα-CsPbI_(2 ) Br films with improved phase sta-bility,high crystallinity,and pinhole-free film morphology was achieved by employing tetramethylammo-nium chloride(TMACl)as an *** a result,the TMACl-added CsPbI_(2) Br films exhibited high power conversion efficiency of 14.12%with an open-circuit voltage of 1.19 V,a short-circuit current density of 15.08 mA/cm^(2),and a fill factor of *** importantly,the TMACl addition imparts hydrophobicity to the film surface of CsPbI_(2) Br,which delivered excellent stability up to 30 days in the ambient condition and thermal stability at 85℃ for 156 h,***,the TMACl-added device also exhibited excellent PCE of 27.16%under indoor light source(1000 lux),which presents a promising approach for designing stable but high performance all-inorganic perovskite solar cells.

关键词： Inorganic perovskite solar cells CsPbI2Br Additive Tetramethylammonium chloride Efficiency

GaN based transfer electron and avalanche transit time devices

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Journal of Semiconductors 2012年第5期33卷 32-37页

作者： R.K.parida A.K.Panda ITER Siksha‘O’Anusandhan University National Institute of Science and Technology

A new model is developed to study the microwave/mm wave characteristics of two-terminal GaNbased transfer electron devices（TEDs）,namely a Gunn diode and an impact avalanche transit time（IMPATT） *** characteristics such as device efficiency and the microwave power generated are computed and compared at D-band（140 GHz center frequency） to see the potentiality of each device under the same operating *** is seen that GaN-based IMPATT devices surpass the Gunn diode in the said frequency region.

关键词： GaN transfer electron device avalanche transit time device

Synthesis and characterization of the nanostructured solid solution with extended solubility of graphite in nickel by mechanical alloying

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International Journal of Minerals,Metallurgy and Materials 2019年第8期26卷 1031-1037页

作者： Nitika Kundan Biswajit parida Anup Kumar Keshri Prathvi Raj Soni Department of Metallurgical and Materials Engineering Malaviya National Institute of TechnologyJaipurRajasthan 302017India Department of Materials Science and Engineering Indian Institute of Technology PatnaBihar 801106India

In the present work,mechanical alloying of a powder mixture of nickel and graphite(up to 15wt%)was carried out in an attrition mill under a nitrogen *** as-milled powders were characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD),and transmission electron microscopy(TEM).The 15wt%graphite dissolved into the nickel(exceeding the negligible solid solubility in the nickel–carbon system),thereby forming a supersaturated solid solution of graphite in a nickel *** dissolved graphite occupied interstitial positions along the dislocation edges and at the grain-boundary regions.A three-step graphite dissolution mechanism has been *** associated changes in the nickel lattice,such as changes in the crystallite size(62 to 43 nm),lattice strain(0.12%to 0.3%),and lattice parameter(0.3533 to 0.3586 nm),which led to the formation of the supersaturated solid solution,were also evaluated and discussed.

关键词： Ni-C system mechanical alloying supersaturated solid solution nanostructured powder

Running Temperature and Mechanical Stability of Grease as Maintenance Parameters of Railway Bearings

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International Journal of Automation and computing 2010年第2期7卷 160-166页

作者： Jan Lundberg Aditya parida Peter Sderholm Division of Operation and Maintenance Engineering Lule University of Technology

Spherical roller bearings in railway car wheels are critical components whose failure may have catastrophic consequences. The present study aims to analyse the mechanical stability of greases and temperature of bearings as indicators for condition-based bearing maintenance. The performed case study includes nine fully-formulated commercial greases examined in the wheel bearings of five ore cars operated in northern Scandinavia. The studied ore cars travelled a distance of about 300 000 km during a period of three years. Small samples of the greases were taken on eight occasions to test their mechanical stability. In addition, the temperatures of the bearings were continuously recorded. After the test period, the wear, electrical damage, and corrosion of the bearings were examined. One of the findings is that the shear stress of the grease at a certain shear velocity （the certain yieldstress （CEY） value） is a good maintenance indicator and is highly dependent on the grease type. The bearing＇s wear, electrical damage and corrosion also depend on the grease type. However, no oxidation of the greases was identified. The paper also outlines a systematic methodology to determine an overall maintenance indicator for railway roller bearings which is based on the field measurements.

关键词： Maintenance mechanical stability railway roller bearings grease lubrication.

Self-powered pressure sensor for ultra-wide range pressure detection

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Nano Research 2017年第10期10卷 3557-3570页

作者： Kaushik parida Venkateswarlu Bhavanasi Vipin Kumar Ramaraju Bendi Pooi See Lee School of Materials Science and Engineering Nanyang Technological University Nanyang Avenue 639798 Singapore

The next generation of sensors should be self-powered, maintenance-free, precise, and have wide-ranging sensing abilities. Despite extensive research and development in the field of pressure sensors, the sensitivity of most pressure sensors declines significantly at higher pressures, such that they are not able to detect a wide range of pressures with a uniformly high sensitivity. In this work, we demonstrate a single-electrode triboelectric pressure sensor, which can detect a wide range of pressures from 0.05 to 600 kPa with a high degree of sensitivity across the entire range by utilizing the synergistic effects of the piezoelectric polarization and triboelectric surface charges of self-polarized polyvinyldifluoride-trifluoroethylene （P（VDF-TrFE）） sponge. Taking into account both this wide pressure range and the sensitivity, this device exhibits the best performance relative to that of previously reported self-powered pressure sensors. This achievement facilitates wide-range pressure detection for a broad spectrum of applications, ranging from simple human touch, sensor networks, smart robotics, and sports applications, thus paving the way forward for the realization of next-generation sensing devices. Moreover, this work addresses the critical issue of saturation pressure in triboelectric nanogenerators and provides insights into the role of the surface charge on a piezoelectric polymer when used in a triboelectric nanogenerator.

关键词： self-powered triboelectric piezoelectric nanogenerator pressure sensor

Relativistic models of anisotropic superdense star in the regime of Karmarkar's condition

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Communications in Theoretical Physics 2023年第2期75卷 168-179页

作者： Bikram Keshari parida Shreya Majumder Shyam Das Koushik Chakraborty Farook Rahaman Department of Physics Pondicherry UniversityKalapetPuducherry 605014India Department of Physics North Bengal St.Xavier’s CollegeJalpaiguriWest Bengal735135India Department of Physics Malda CollegeMalda 732101West BengalIndia Department of Physics Government College of EducationBurdwanWest Bengal712103India Department of Mathematics Jadavpur UniversityKolkata 700032West BengalIndia

We obtained a new class of solutions for a relativistic anisotropic compact star by utilizing the Karmarkar embedding *** obtain the closed-form solution a suitable form of one of the gravitational potentials has been chosen to determine the other by analyzing the Karmarkar *** resulting solutions are found to be well-behaved and regular and could describe a compact stellar *** the current estimated values of the mass and radius of the pulsar 4U1820-30 as input parameters,all the physically relevant parameters are shown to be well-behaved to a very good degree of accuracy.

关键词： anisotropic compact star embedding class one Karmarkar’s condition