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Magnetic force improvement and parameter optimization for magnetic abrasive polishing of AZ31 magnesium alloy

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中国有色金属学会会刊：英文版 2008年第A01期18卷 369-373页

作者： s.O.KIM j.s.KWAK Graduate school of Mechanical Engineering Pukyong National UniversitySouth Korea school of Mechanical Engineering Pukyong National UniversitySouth Korea

The magnetic force acting on workpiece to be machined plays a significantly important role in magnetic abrasive polishing *** in a case of polishing nonferrous materials,the strength of magnetic force is very low and it leads lower polishing *** magnesium alloy that has superior mechanical properties for industrial application such as a lightweight and high specific strength is one of the most famous nonferrous *** improving strategy of the magnetic force for the AZ31 magnesium alloy installed with a permanent magnet was proposed and experimental verification was carried *** the proposed strategy,the effect of process parameters on the surface roughness of the AZ31 magnesium alloy was evaluated by a design of experimental method.

关键词：镁合金物理性能磁力最优化设计磁性

Impact of La^(3+)substitution on electrical,magnetic,dielectric and optical properties of Ni_(0.7)Cu_(0.1)Zn_(0.2)LaxFe_(2-x)O_(4)(0system

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journal of Rare Earths 2023年第5期41卷 740-746,I0004页

作者： B.B.Patil A.D.Pawar s.s.Barate j.s.Ghodake j.B.Thorat T.j.shinde P.G.Department of Physics Smt.KRP Kanya MahavidyalayaIslampurMS415409India Department of Physics Shivaji UniversityKolhapurMS416004India Departments of Physics PDVP MahavidyalayaMahavidyalayaTasgaonMS416312India Department of Physics Sadguru Gadage Maharaj CollegeKaradMS415110

The oxalate co-precipitation method was used to synthesize the La3+substituted Ni-Cu-Zn(La-NCZ)nanoferrites having chemical composition Ni_(0.7)Cu_(0.1)Zn_(0.2)LaxFe_(2-x)O_(4)(x=0.015,0.025 and 0.035).DC resistivity study of nanoferrites shows both the conducting and semiconducting *** room temperature DC electrical resistivity of Ni-Cu-Zn(NCZ)nanoferrites decreases,whereas Curie temperature increases with increasing La^(3+)*** the temperature range of 30-170℃nanoferrites show p-type semiconducting behavior except x=0.015;thereafter,they show n-type *** frequency dispersive initial permeability(μi)associated with its real and imaginary(μ’andμ")parts are attributed to the domain wall movement and magnetic spin ***μi,u’andμ"of La-NCZ nanoferrites are higher than those of pure NCZ *** constant(ε’),dielectric loss(ε")and AC resistivity(ρAC)of La-NCZ nanoferrites show normal dielectric *** is found thatε’of NCZ nanoferrites decreases with the increasing content of La3+*** bandgap energy of La-NCZ nanoferrites is achieved in the range 1.36-1.70 eV confirming the semiconducting nature of materials.

关键词： Ni-Cu-La-Zn nanoferrites DC electrical Resistivity Permeability Dielectric properties Bandgap energy Rare earths

Copy-Move Geometric Tampering Estimation Through Enhanced sIFT Detector Method

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Computer systems science & Engineering 2023年第1期44卷 157-171页

作者： j.s.sujin s.sophia Department of Electronics and Communication Engineering Sri Krishna College of TechnologyCoimbatore641042India Department of Electronics and Communication Engineering Sri Krishna College of Engineering and TechnologyCoimbatore641008India

Digital picture forgery detection has recently become a popular and sig-nificant topic in image *** to advancements in image processing and the availability of sophisticated software,picture fabrication may hide evidence and hinder the detection of such criminal *** practice of modifying origi-nal photographic images to generate a forged image is known as digital image forging.A section of an image is copied and pasted into another part of the same image to hide an item or duplicate particular image elements in copy-move *** order to make the forgeries real and inconspicuous,geometric or post-processing techniques are frequently performed on tampered regions during the tampering *** Copy-Move forgery detection,the high similarity between the tampered regions and the source regions has become crucial *** most frequent way for detecting copy-move forgeries is to partition the images into overlapping square blocks and utilize Discrete cosine transform(DCT)com-ponents as block *** to the high dimensionality of the feature space,Gaussian Radial basis function(RBF)kernel based Principal component analysis(PCA)is used to minimize the dimensionality of the feature vector repre-sentation,which improves feature matching *** this paper,we propose to use a novel enhanced scale-invariant feature transform(sIFT)detector method called as RootsIFT,combined with the similarity measures to mark the tampered areas in the *** proposed method outperforms existing state-of-the-art methods in terms of matching time complexity,detection reliability,and forgery location accuracy,according to the experimental *** F1 score of the proposed method is 92.3%while the literature methods are around 90%on an average.

关键词： Multi sensor data fusion discriminator orientation pose position mean average precision recall

BEsT WEIGHT PATTERN EVALUATION BAsED sECURITY CONsTRAINED POWER DIsPATCH ALGORITHM

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journal of systems science and systems Engineering 2007年第3期16卷 287-307页

作者： Lakhwinder sINGH j.s. DHILLON Baba Banda singh Bahadur Engineering College Fatehgarh Sahib- 140407 Punjab India sant Longowal Institute of Engineering & Technology Longowa1-148 106 Punjab India

This paper presents a methodology which determines the allocation of power demand among the committed generating units while minimizes number of objectives as well as meets physical and technological system constraints. The procedure considers two decoupled problems based upon the dependency of their goals on either active power or reactive power generation. Both the problems have been solved sequentially to achieve optimal allocation of active and reactive power generation while minimizes operating cost, gaseous pollutants emission objectives and active power transmission loss with consideration of system operating constraints along with generators prohibited operating zones and transmission line flow limits. The active and reactive power line flows are obtained with the help of generalized generation shift distribution factors （GGDF） and generalized Z-bus distribution factors （GZBDF）, respectively. First problem is solved in multi-objective framework in which the best weights assigned to objectives are determined while employing weighting method and in second problem, active power loss of the system is minimized subject to system constraints. The validity of the proposed method is demonstrated on 30-bus IEEE power system.

关键词： Multi-objective optimization best weight pattern evaluation fuzzy decision making membership function generalized generation shift distribution factors generalised Z-bus distribution factors

FUZZY sATIsFYING INTERACTIVE MULTIOBjECTIVE THERMAL POWER DIsPATCH： sWT APPROACH

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journal of systems science and systems Engineering 2007年第1期16卷 88-106页

In multiobjective optimization, trade-off analysis plays an important role in determining most preferred solution. This paper presents an explicit interactive trade-off analysis based on the surrogate worth trade-off function to determine the best compromised solution. In the multiobjective framework thermal power dispatch problem is undertaken in which four objectives viz. cost, NOx emission, sOx emission and COx emission are minimized simultaneously. The interactive process is implemented using a weighting method by regulating the relative weights of objectives in systematic manner. Hence the weighting method facilitates to simulate the trade-offrelation between the conflicting objectives in non-inferior domain. Exploiting fuzzy decision making theory to access the indifference band, interaction with the decision maker is obtained via surrogate worth trade-off （sWT） functions of the objectives. The surrogate worth trade-off functions are constructed in the functional space and then transformed into the decision space, so the surrogate worth trade-off functions of objectives relate the decision maker＇s preferences to non-inferior solutions through optimal weight patterns. The optimal solution of thermal power dispatch problem is obtained by considering real and reactive power losses. Decoupled load flow analysis is performed to find the transmission losses. The validity of the proposed method is demonstrated on 11-bus, 17-lines IEEE system, comprising of three generators.

关键词： Multiobjective thermal power dispatch weighting method fuzzy membership function non-inferior solutions sWT functions

Transient parameter analysis of pneumatic conveying of fine particles for predicting the change of mode of flow

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Particuology 2017年第3期15卷 82-88页

作者： shijo j.s. Niranjana Behera school of Mechanical & Building sciences VIT University Vellore Tamilnadu 632014 India

During the process of pneumatic conveying of fine particles, the flow mode may change from dense to dilute. In studying this mode change, we evaluate three parameters （Hurst exponent, shannon entropy, and phase-space attractor size） used in signal analysis. Experimental data of pneumatic conveying of fly ash at three locations along a 173-m-long pipeline were used for this analysis. Variations in magnitude of the Hurst exponent, shannon entropy, and size of the phase space attractor exhibit different trends in their variations for dense and dilute mode of flow. From these trends it is possible to predict the change from dense to dilute mode and the location along the length of the pipeline of this change in mode of flow.

关键词： Fluidized denseHurst exponent shannon entropy Phase space

Corrosion Inhibition of Mild steel in sulphuric Acid Using Luffa Aegyptiaca Leaves Extract

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Acta Metallurgica sinica(English Letters) 2014年第6期27卷 969-980页

作者： s. jyothi j. Ravichandran Post Graduate and Research Department of Chemistry Sri Ramakrishna Mission Vidyalaya College of Arts and Science

The corrosion inhibition of mild steel（Ms） in sulphuric acid using Luffa aegyptiaca（LA） leaves extract was investigated by weight loss studies, colorimetric measurements, potentiodynamic polarisation and electrochemical impedance spectroscopy. The adsorption of LA leaves extract was confirmed by Fourier transform infrared spectroscopy and optical profilometry. The inhibition efficiency increased with increasing concentration of the extract but decreased with rise in temperature and with the increase in acid strength. Furthermore, the inhibition efficiency synergistically increased on the addition of halide ions. Polarisation studies revealed that the LA extract acts as mixed- type inhibitor. Physical adsorption mechanism is proposed from the trend in inhibition efficiency with the change in temperature and from thermodynamic parameters. The adsorption of LA on Ms surface obeys Langmuir adsorption isotherm and follows the kinetic thermodynamic model of ElAwady at all temperatures studied.

关键词： Mild steel Adsorption Corrosion Thermodynamic properties FTIR

Operational Tau Approximation for the Fokker-Planck Equation

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Chinese Physics Letters 2012年第4期29卷 141-144页

作者： s.s.Dehcheshmeh s.Karimi Vanani j.s.Hafshejani Department of Mathematics Islamic Azad UniversityFarsan BranchFarsanIran

An extension of the operational Tau method (OTM) is used to solve the Fokker Planck equation arising in many physical *** extension yields an algebraic equivalent representation of the desired problem using arbitrary polynomial basis functions to decrease the size of the *** structure,properties and advantages of the OTM are presented,and some illustrative linear and nonlinear experiments are given to show the capability and efficiency of the proposed algorithm.

关键词： problems Approximation polynomial

VRs-DB:preserve confidentiality of users'data using encryption approach

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Digital Communications and Networks 2021年第1期7卷 62-71页

作者： j.s.Rauthan K.s.Vaisla Department of Computer and science Engineering Uttarakhand Technical UniversityDehradunUttarakhand248007India

We focus on security and privacy problems within a cloud database framework,exploiting the DataBase as a service(DBaas).In this framework,an information proprietor drives out its information to a cloud database professional *** Data-Owner(DO)encrypts the delicate information before transmission at the cloud database professional company end to offer information *** encryption ideas,nonetheless,are just halfway homomorphic as all of them intend to enable an explicit kind of calculation,which is accomplished on scrambled *** current plans can't be coordinated to solve genuine functional queries that include activities of various *** propose and evaluate a Verifiable Reliable secure-DataBase(VRs-DB)framework on shared tables along with many primary operations on scrambled information,which enables information interoperability,and permits an extensive possibility of structured Query Language(sQL)queries to be prepared by the service provider on the encoded *** show that our security and privacy idea is protected from two forms of threats and are fundamentally proficient.

关键词： Privacy security Cloud storage Encrypted query Cryptography sensitive data