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Development and characterization of stainless steel fiber-based copper-free brake liner formulation:A positive solution for steel fiber replacement

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Friction 2020年第2期8卷 396-420页

作者： Vijay r D.Lenin SINGArAVELU r.JAYAGANTHAN Department of Production Engineering National Institute of TechnologyTiruchirappalli 620015Tamil NaduIndia Department of Engineering Design Indian Institute of Technology MadrasChennai 600036Tamil NaduIndia

This study deals with the development of drum brake liner for a multi-utility vehicle possessing a hydraulic brake system by varying 7 weight%of steel fiber and stainless steel fiber each,in friction composite *** developed friction composites were tested for physical,chemical,corrosion,mechanical,thermal properties,and tribological characteristics,under near-actual conditions using an inertia dynamometer as per industrial *** element analysis software(ANSYS)analysis was performed to show the thermal stress distribution of the developed friction composites at the maximum temperature rise due to heat generated during brake stops,and an extensive evaluation method was used to rank the *** study concludes that the brake factor of the stainless steel fiber-based friction composite produces stable performance in all conditions with a lower liner temperature rise of 340°C and lower thermal stress at 4.255294 ***,the steel fiber-based composites produced high performance at the beginning but deteriorated after a certain period due to higher levels of corrosion and a high temperature rise of 361°C resulting in a negative fade(-0.84%)and more thermal stress(5.619102 MPa).The primary plateau,secondary plateau,back transfer of drum wear debris,and the distribution of constituents on the worn surface of the developed composites in a resin matrix were identified and studied using a scanning electron microscope(SEM)equipped with energy-dispersive spectroscopy.

关键词： stainless steel fiber steel fiber brake liner friction composite

Effect of spheroidization of cementite in ductile cast iron

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International Journal of Minerals,Metallurgy and Materials 2021年第3期28卷 404-411页

作者： Basavaraj Pavankumar r.Sondar Subray r.Hegde Department of Metallurgical and Materials Engineering National Institute of Technology Karnataka(NITK)Surathkal 575025India

The research aims to provide an alternative to austempering treatment of ductile cast iron with a simple and cost-effective heat-treatment *** goal was accomplished by applying a simple one-step spheroidization heat treatment to the as-cast ductile iron,which would normally possess a coarse pearlitic microstructure to a significant *** experiments involving isothermal holding below the lower critical temperature(A1)were conducted followed by standard mechanical testing and microstructural characterization for an experimental ductile *** improving the spheroidization holding time at a given temperature,the work shows that the ductility and toughness of an as-cast ductile iron can be improved by 90%and 40%,respectively,at the cost of reducing the tensile strength by 8%.Controlled discretization of the continuous cementite network in pearlitic matrix of the ductile iron is deemed responsible for the improved *** work also shows that prolonged holding time during spheroidization heat treatment leads to degradation of mechanical properties due to the inhomogenous microstructure formation caused by heterogeneous decomposition and cementite clustering in the *** main outcome of this work is the demonstration of ductile cast iron’s necking behavior due to spheroidization heat treatment.

关键词： spheroidization cementite ductile iron toughness heat treatment

Future Trends in Computer Graphics： How Much is Enough？

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Journal of Computer Science & Technology 2003年第5期18卷 531-537页

作者： A.r.Forrest SchoolofComputingSciences UniversityofEastAngliaNorwichU.K.

Over the forty-year history of interactive computer graphics, there have beencontinuous advances, but at some stage this progression must terminate with images beingsufficiently realistic for all practical purposes. How much detail do we really need? Polygon countsover a few million imply that on average each polygon paints less than a single pixel, making useof polygon shading hardware wasteful. We consider the problem of determining how much realism isrequired for a variety of applications. We discuss how current trends in computer graphics hardware,and in particular of graphics cards targeted at the computer games industry, will help or hinderachievement of these requirements. With images now being so convincingly realistic in many cases,critical faculties are often suspended and the images are accepted as correct and truthful althoughthey may well be incorrect and sometimes misleading or untruthful. Display resolution has remainedlargely constant in spatial terms for the last twenty years and in terms of the number of pixels hasincreased by less than an order of magnitude. If the long-promised breakthroughs in displaytechnology are finally realised, how should we use the increased resolution?

关键词： computer graphics displays graphics hardware human vision point-basedmodelling

High-temperature thermodynamics of silver:Semi-empirical approach

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Chinese Physics B 2017年第11期26卷 400-407页

作者： r H Joshi B Y Thakore P r Vyas A r Jani N K Bhatt Department of Physics Sardar Patel University Department of Physics School of Sciences Gujarat University Sardar Patel Center for Science and Technology Department of Physics M.K.Bhavnagar University

We report high-temperature thermodynamics for fcc silver by combining ab initio phonon dynamics to empirical quadratic temperature-dependent term for anharmonic part of Helmholtz free energy. The electronic free energy is added through an interpolation scheme, which connects ambient condition free electron gas model to Thomas-Fermi *** present study shows good agreement with experimental and reported findings for several thermal properties, and the discrepancy observed in some caloric properties is addressed. The decreases in the product of volume thermal expansion coefficient and isothermal bulk modulus and in the constant volume anharmonic lattice specific heat at high temperature are the clear evidences of proper account of anharmonicity. The present study also reveals that T-2-dependent anharmonic free energy is sufficient for correct evaluation of thermal pressure and conventional Grüneisen parameter. We observe that the intrinsic phonon anharmonicity starts dominating above characteristic temperature, which is attributed to higher order anharmonicity and can be related to higher order potential derivatives. We conclude that the uncorrelated and largeamplitude lattice vibrations at high temperature raise dominating intrinsic thermal stress mechanism, which surpasses the phonon-anharmonism and requires future consideration.

关键词： thermodynamics anharmonicity Grüneisen parameter silver

On the Characterizability of the Automorphism Groups of Sporadic Simple Groups by Their Element Orders

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Acta Mathematica Sinica,English Series 2004年第4期20卷 653-662页

作者： A.r.MOGHADDAMFAr A.r.ZOKAYI M.r.DArAFSHEH Department of Mathematics Faculty of ScienceK.N.Toosi University of TechnologyP.O.Box 16315-1618TehranIran Department of Mathematics and Computer Sciences Faculty of ScienceUniversity of TehranTehranIran

For G a finite group,π_e(G)denotes the set of orders of elements in *** Ω is a subset of the set of natural numbers,h(Ω)stands for the number of isomorphism classes of finite groups with the same set Ω of element *** say that G is k-distinguishable if h(π_(G))=krwise G is called ***,a 1-distinguishable group is called a characterizable *** is shown that if M is a sporadic simple group different from M_(12),M_(22),J_2,He,Suz,M^cL and O'N, then Aut(M)is charaeterizable by its dement *** is also proved that if M is isomorphic to M_(12),M_(22),He,Suz or O'N,then h(π_e(Aut(M)))∈{1,∞}.

关键词： Automorphism group Element orders Prime graph Sporadic simple groups

A rECOGNITION OF SIMPLE GrOUPS PSL(3,q) BY THEIr ELEMENT OrDErS

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Acta Mathematica Scientia 2004年第1期24卷 45-51页

作者： M.r.Darafsheh A.r.Moghaddamfar A.r.Zokayi Department of Mathematics and Computer Sciences Faculty of Science University of Tehran Tehran IranDepartment of Mathematics K. N. T University of TechnologyP.O. Boz 16315-1618 Tehuan IranDepartment of Mathematics K. N. T University of TechnologyP.O. Boz 16315-1618 Tehuan Iran

For any group G, denote byπe(G) the set of orders of elements in G. Given a finite group G, let h(πe (G)) be the number of isomorphism classes of finite groups with the same set πe(G) of element orders. A group G is called k-recognizable if h(πe(G)) = k rwise G is called non-recognizable. Also a 1-recognizable group is called a recognizable (or characterizable) group. In this paper the authors show that the simple groups PSL(3,q), where 3 re recognizable.

关键词： Element order prime graph projective special linear group

role of quantum paths in generation of attosecond pulses

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Chinese Physics B 2020年第10期29卷 276-281页

作者： M r Sami A Shahbaz Department of Physics Government College UniversityP.O.Box 54000 LahorePakistan

We investigate the role of core potential in high ionization potential systems on high harmonic generation (HHG) spectra and obtain attosecond pulses. In our scheme, we use a standard soft core potential to model high ionization potential systems and irradiated these systems with fixed laser parameters. We observe the role of these systems on all the three steps involved in HHG process including ionization, propagation and recombination. In our study, the results illustrate that for high ionization potential systems, the HHG process is more sensitive to the ionization probability compared to the recombination amplitude. We also observe that due to the stronger core potential, small oscillations of the electrons during the propagation do not contribute to the HHG spectrum, which implies the dominance of only long quantum paths in the HHG spectrum. Our results, for attosecond pulse generation, show that long quantum path electrons are responsible for the supercontinuum region near the cutoff, which is suitable for the extraction of a single attosecond pulse in this region.

关键词： high-order harmonic generation attosecond pulses quantum paths strong nuclear potential

Prediction Model Using reinforcement Deep Learning Technique for Osteoarthritis Disease Diagnosis

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Computer Systems Science & Engineering 2022年第7期42卷 257-269页

作者： r.Kanthavel r.Dhaya Department of Computer Engineering King Khalid UniversityAbhaSaudi Arabia Department of Computer Science King Khalid University-Sarat Abidha CampusAbhaSaudi Arabia

Osteoarthritis is the most common class of arthritis that involves tears down the soft cartilage between the joints of the *** regeneration of this cartilage tissue is not possible,and thus physicians typically suggest therapeutic measures to prevent further deterioration over ***,bringing about joint replacement is a remedial course of *** itself in joint pain recog-nized with a normal *** learning plays a vital role in predicting the early stages of osteoarthritis by using the MrI pictures of muscles of the knee *** can be used to accurately measure the shape and texture of biological structures can be measured consistently from X-ray ***,deep learning-based computation can be used to design framework to predict whether a given patient will develop *** a framework can identify clear biochemical changes in the focal point of ligaments of the knees of patients who have exhibit pre-indications in standard *** study proposes framework to identify cases of osteoarthritis by using deep learning and reinforcement *** can be used as a clinical mechanism to predict the occurrence of osteoarthritis so that patients can beneﬁt from early intervention.

关键词： Osteoarthritis deeplearning reinforcementlearning arthritis early detection trainingandframework

Efficient Supply Current Control Strategies for Bridgeless Interleaved AC-DC Converter

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Computer Systems Science & Engineering 2022年第10期43卷 175-191页

作者： r.Sasikala r.Seyezhai Department of Electrical and Electronics Engineering Sathyabama Institute of Science and Technology(Deemed to be University)ChennaiTamil Nadu600119India Department of Electrical and Electronics Engineering SSN College of EngineeringChennaiTamil Nadu603110India

This paper presents an efficient supply current wave shaping technique for bridgeless interleaved Single Ended Primary Inductor Converter(SEPIC).The SEPIC converter converts an Alternating Current(AC)to Direct Current(DC)with the boost *** Factor Correction(PFC)is progressively significant to achieve high energy *** overall system efficiency can be increased as the bridgeless topology has less conduction losses from rectifying ***,the bridgeless and interleaved techniques are incorporated in this study to achieve better *** performance of the system is analyzed on both current control and sensor-less *** controllers such as Proportional Integral(PI)control,peak current control,Non-Linear Carrier(NLC)control,and sensor-less current control are *** the above controllers are implemented using MATrix LABoratory(MATLAB)/*** performance parameter,namely Power Factor(PF),Total Harmonic Distortion(THD),is computed for both open loop and closed loop *** sensor-less current control method is implemented using the DsPIC30F2010 *** circuit performance is also verified from the simulation and hardware *** proposed controller has inbuilt Analog-to-Digital Converter(ADC),Digital-to-Analog Converter(DAC),Pulse Width Modulation(PWM)generator,and provides fast responses.

关键词： Light emitting diode power factor correction SEPIC converter current control method sensor-less method fast Fourier transform analysis for input current