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Bi_(2)O_(3)/ZnO nanocomposite:Synthesis,characterizations and its application in electrochemical detection of balofloxacin as an antibiotic drug

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Journal of Pharmaceutical Analysis 2021年第1期11卷 57-67页

作者： Sana ansari m.shahnawaze ansari Soami P.Satsangee Rajeev Jain Department of Chemistry Dayalbagh Educational InstituteDayalbaghAgra282005India Center of Nanotechnology King Abdulaziz UniversityJeddah21589Saudi Arabia Advanced membrane Technology Research Centre(AmTEC) Universiti Teknologi Malaysia81310SkudaiJohorMalaysia School of Chemical and Energy Engineering Universiti Teknologi Malaysia81310SkudaiJohorMalaysia School of Studies in Chemistry Jiwaji UniversityGwalior474011India

In the present work,a chemically modified electrode has been fabricated utilizing Bi_(2)O_(3)/ZnO *** nanocomposite was synthesized by simple sonochemical method and characterized for its structural and morphological properties by using XRD,FESEm,EDAX,HRTEm and XPS *** results clearly indicated co-existence of Bi_(2)O_(3) and ZnO in the nanocomposite with chemical interaction between ***_(2)O_(3)/ZnO nanocomposite based glassy carbon electrode(GCE)was utilized for sensitive voltammetric detection of an anti-biotic drug(balofloxacin).The modification amplified the electroactive surface area of the sensor,thus providing more sites for oxidation of *** and square wave voltammograms revealed that Bi_(2)O_(3)/ZnO modified electrode provides excellent electrocatalytic action towards balofloxacin *** current exhibited a wide linear response in concentration range of 150e1000 nm and detection limit of 40.5 nm was *** modified electrode offered advantages in terms of simplicity of preparation,fair stability(RSD 1.45%),appreciable reproducibility(RSD 2.03%)and *** proposed sensor was applied for determining balofloxacin in commercial pharmaceutical formulations and blood serum samples with the mean recoveries of 99.09% and 99.5%,respectively.

关键词： ZnO nanoparticles Chemically modified electrode Voltammetry Drug analysis

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On the van der Waals interaction of carbon nanotubes as electromechanical nanothermometers

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Acta mechanica Sinica 2013年第4期29卷 622-632页

作者： R.ansari m.Daliri m.Hosseinzadeh Department of mechanical Engineering University of Guilan

Electromechanical carbon nanothermometers are devices that work based on the interactions and relative mo- tions of double-walled carbon nanotubes （DWCNTs）. In this paper, the mechanics of carbon nanotubes （CNTs） con- stituting two welt-known configurations for nanothermome- ter, namely shuttle configuration and telescope configuration are fully investigated. Lennard-Jones （LJ） potential func- tion along with the continuum approximation is employed to investigate van der Waals （vdW） interactions between the in- teracting entities. Accordingly, semi-analytical expressions in terms of single integrals are obtained for vdW interactions. Acceptance condition and suction energy are studied for the shuttle configuration. In addition, a universal potential en- ergy is presented for the shuttle configuration consisting of two finite CNTs. Also, for the telescope configuration, ex- tensive studies are performed on the distributions of potential energy and interaction force for various radii and lengths of CNTs. It is found that these geometrical parameters have a considerable effect on the potential energy.

关键词： Electromechanical carbon nanothermometer ~Continuum approximation ~ Carbon nanotubes ~ van derWaals interaction

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Potential use of durian fruit(Durio zibenthinus Linn) as an adjunct to treat infertility in polycystic ovarian syndrome

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Journal of Integrative medicine 2016年第1期14卷 22-28页

作者： Reshma m. ansari Department of Basic medical Sciences Cyberjaya University College of Medical Sciences Cyberjaya 63000 Selangor Malaysia

Infertility due to polycystic ovarian syndrome （PCOS） is a worldwide problem that is increasing at alarming rates. Insulin resistance, the prime factor of PCOS, induces comorbid metabolic syndrome as well. Durian （Durio zibenthinus Linn）, a fruit of Southeast Asia, is used as a natural supplement in healthy diets. This paper is a short literature review that examines the fruit＇s effects against various components of metabolic syndrome and its fertility-enhancing properties in PCOS. Various published literature was reviewed to learn of the anti-inflammatory, anti-oxidant, anti-obesity, anticholesterol, and antihypoglycaemic nature of the fruit. The literature search was done using Pubmed, Google Scholar and library databases. The keywords used were polycystic ovarian syndrome, infertility, metabolic syndrome and Durian zibenthinus Linn. Reviewed studies showed that the fruit is effective against various components of metabolic syndrome, but the mechanisms of action against anovulation and menstrual disturbances in PCOS have yet to be studied. The traditional use of durian as a fertility-enhancing agent needs to be validated scientifically by isolating its various components and ascertaining its fertility enhancing properties.

关键词： Durian zibenthius Linn polycystic ovarian syndrome infertility metabolic syndrome

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Automated Teller machine Authentication Using Biometric

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Computer Systems Science & Engineering 2022年第6期41卷 1009-1025页

作者： Shumukh m.Aljuaid Arshiya S.ansari Department of Information Technology College of Computer and Information SciencesMajmaah UniversityAl Majma’ah 11952Saudi Arabia

This paper presents a novel method of a secured card-less AutomatedTeller machine (ATm) authentication based on the three bio-metrics measures. Itwould help in the identification and authorization of individuals and would provide robust security enhancement. moreover, it would assist in providing identi-fication in ways that cannot be impersonated. To the best of our knowledge, thismethod of Biometric_ fusion way is the first ATm security algorithm that utilizesa fusion of three biometric features of an individual such as Fingerprint, Face, andRetina simultaneously for recognition and authentication. These biometric imageshave been collected as input data for each module in this system, like a fingerprint, a face, and a retina module. A database is created by converting theseimages to YIQ color space, which is helpful in normalizing the brightness levelsof the image hence mainly (Y component’s) luminance. Then, it attempt toenhance Cellular Automata Segmentation has been carried out to segment the particular regions of interest from these database images. After obtaining segmentation results, the featured extraction method is carried out from these criticalsegments of biometric photos. The Enhanced Discrete Wavelet Transform technique (DWT mexican Hat Wavelet) was used to extract the features. Fusion ofextracted features of all three biometrics features have been used to bring in themultimodal classification approach to get fusion vectors. Once fusion vectorsware formulated, the feature level fusion technique is incorporated based on theextracted feature vectors. These features have been applied to the machine learning algorithm to identify and authorization of multimodal biometrics for ATmsecurity. In the proposed approach, we attempt at useing an enhanced Deep Convolutional Neural Network (DCNN). A hybrid optimization algorithm has beenselected based on the effectiveness of the features. The proposed approach resultswere compared with existing algorithms ba

关键词： ATm security biometrics face recognition fingerprint fusion technique hybrid optimization retina recognition image segmentation

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Bending of Euler-Bernoulli nanobeams based on the strain-driven and stress-driven nonlocal integral models: a numerical approach

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Acta mechanica Sinica 2018年第5期34卷 871-882页

作者： m.Faraji Oskouie R.ansari H.Rouhi Department of mechanical Engineering University of GuilanP.O.Box 3756RashtIran Department of Engineering Science Faculty of Technology and EngineeringEast of GuilanUniversity of GuilanRudsar-Vajargah 44891-63157Iran

Eringen's nonlocal elasticity theory is extensively employed for the analysis of nanostructures because it is able to capture nanoscale *** studies have revealed that using the differential form of the strain-driven version of this theory leads to paradoxical results in some cases,such as bending analysis of cantilevers,and recourse must be made to the integral *** this article,a novel numerical approach is developed for the bending analysis of Euler-Bernoulli nanobeams in the context of strain-and stress-driven integral nonlocal *** numerical approach is proposed for the direct solution to bypass the difficulties related to converting the integral governing equation into a differential ***,the governing equation is derived based on both strain-driven and stress-driven nonlocal models by means of the minimum total potential ***,in each case,the governing equation is obtained in both strong and weak *** solve numerically the derived equations,matrix differential and integral operators are constructed based upon the finite difference technique and trapezoidal integration *** is shown that the proposed numerical approach can be efficiently applied to the strain-driven nonlocal model with the aim of resolving the mentioned ***,it is able to solve the problem based on the strain-driven model without inconsistencies of the application of this model that are reported in the literature.

关键词： Eringen's nonlocal theory Stress-driven model Strain-driven model Euler-Bernoulli beam Numerical approach Paradox

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Nonlinear vibration analysis of fractional viscoelastic Euler–Bernoulli nanobeams based on the surface stress theory

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Acta mechanica Solida Sinica 2017年第4期30卷 416-424页

作者： m.Faraji Oskouie R.ansari F.Sadeghi Department of mechanical Engineering University of Guilan

The nonlinear vibrations of viscoelastic Euler-Bernoulli nanobeams are studied using the fractional calculus and the Gurtin-murdoch theory. Employing Hamilton＇s principle, the governing equation considering surface effects is derived. The fractional integro-partial differential governing equation is first converted into a fractional-ordinary differential equation in the time domain using the Galerkin scheme. Thereafter, the set of nonlinear fractional time-dependent equations expressed in a state-space form is solved using the predictorcorrector method. Finally, the effects of initial displacement, fractional derivative order, viscoelasticity coefficient, surface parameters and thickness-to-length ratio on the nonlinear time response of simply-supported and clamped-free silicon viscoelastic nanobeams are investigated.

关键词： Fractional calculus Viscoelastic nanobeam Nonlinear vibrations

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STABILITY CHARACTERISTICS OF SINGLE-LAYERED ZINC OXIDE NANOSHEETS UNDER UNIAXIAL LOADING

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Acta mechanica Solida Sinica 2014年第4期27卷 429-440页

作者： R.ansari S.Rouhi m.Aryayi m.mirnezhad Department of mechanical Engineering University of Guilan P.O.Box 3756 Rasht Iran Young Researchers Club Langroud Branch Islamic Azad University Langroud Guilan Iran

This paper is aimed to propose a three-dimensional model which would be used for investigation on the mechanical behavior of single-layered zinc oxide nanosheets. To develop this model, molecular mechanics is coupled with the density functional theory. Simulating the hexagonal lattices of nanosheets as a hexagonal mechanical structure composed of structural beam elements, the buckling behavior of zinc oxide nanosheets is studied. Effects of different parameters on the stability of armchair and zigzag nanosheets are examined. It is shown that the buckling forces of zigzag nanosheets are slightly greater than those of armchair ones. However, with increasing size of nanosheets the effect of atomic structure on the stability of nanosheets *** studying the effect of end conditions on the buckling behavior of nanosheets, it is shown the stability of nanosheets is affected significantly by boundary conditions.

关键词： zinc oxide nanosheets buckling finite element model density functional theory

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Vibration analysis of two-dimensional structures using micropolar elements

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Applied mathematics and mechanics(English Edition) 2021年第7期42卷 999-1012页

作者： m.KOHANSAL-VAJARGAH R.ansari m.FARAJI-OSKOUIE m.BAZDID-VAHDATI Faculty of mechanical Engineering University Campus 2University of GuilanRasht 41447-84475Iran Faculty of mechanical Engineering University of GuilanRasht 3756Iran

Based on the micropolar theory(mPT),a two-dimensional(2 D)element is proposed to describe the free vibration response of *** the context of the mPT,a 2 D formulation is developed within the ABAQUS finite element *** user-defined element(UEL)subroutine is used to implement a micropolar *** micropolar effects on the vibration behavior of 2 D structures with arbitrary shapes are *** effect of micro-inertia becomes dominant,and by considering the micropolar effects,the frequencies ***,there is a considerable discrepancy between the predicted micropolar and classical frequencies at small scales,and this difference decreases when the side length-to-length scale ratio becomes large.

关键词： finite element method(FEm) quadrilateral element micropolar theory(mPT) user-defined element(UEL)subroutine free vibration

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STABILITY OF SOmE POSITIVE LINEAR OPERATORS ON COmPACT DISK

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Acta mathematica Scientia 2015年第6期35卷 1492-1500页

作者： m.mURSALEEN Khursheed J.ansari Asif KHAN Department of mathematics Aligarh Muslim University

Recently, Popa and Rata [27, 28] have shown the （in）stability of some classical operators defined on [0, 1] and found best constant when the positive linear operators are stable in the sense of Hyers-Ularn. In this paper we show Hyers-Ulam （in）stability of complex Bernstein-Schurer operators, complex Kantrovich-Schurer operators and Lorentz operators on compact disk. In the case when the operator is stable in the sense of Hyers and Ulam, we find the infimum of Hyers-Ulam stability constants for respective operators.

关键词： Hyers-Ulam stability Bernstein-Schurer operators Kantrovich-Schurer opera-tors Lorentz operators stability constants

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Nanoscale finite element models for vibrations of single-walled carbon nanotubes: atomistic versus continuum

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Applied mathematics and mechanics(English Edition) 2013年第10期34卷 1187-1200页

作者： R. ansari S. ROUHI m. ARYAYI Department of mechanical Engineering University of GuilanRasht 3756 Iran Young Researchers Club Langroud Branch Islamic Azad UniversityLangroud 44715-1333 Iran

By the atomistic and continuum finite element models, the free vibration behavior of single-walled carbon nanotubes （SWCNTs） is studied. In the atomistic finite element model, the bonds and atoms are modeled by the beam and point mass elements, respectively. The molecular mechanics is linked to structural mechanics to determine the elastic properties of the mentioned beam elements. In the continuum finite element approach, by neglecting the discrete nature of the atomic structure of the nanotubes, they are modeled with shell elements. By both models, the natural frequencies of SWCNTs are computed, and the effects of the geometrical parameters, the atomic structure, and the boundary conditions are investigated. The accuracy of the utilized methods is verified in comparison with molecular dynamic simulations. The molecular structural model leads to more reliable results, especially for lower aspect ratios. The present analysis provides valuable information about application of continuum models in the investigation of the mechanical behaviors of nanotubes.

关键词： vibration single-walled carbon nanotube (SWCNT) molecular structural model continuum shell model

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