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Graphene coatings for corrosion resistance of nickel and copper in acidic,alkaline and neutral environments

Journal of Materials Science & Technology 2023年第11期142卷 124-133页

作者： R.k.Singh Raman abhishek k.mar arya kevin Tomy Faisal A Dip Evelyn Lai Saad Al-Saadi Department of Mechanical&Aerospace Engineering Monash UniversityVic 3800Australia Department of Chemical&Biological Engineering Monash UniversityVic 3800Australia

Graphene coatings have been reported to provide impressive corrosion resistance to nickel(Ni)and copper(Cu),because of remarkable characteristics of inertness and impermeablity of ***,as the earlier investigations have generally been carried out in chloride environment,and it is important to understand the performance of graphene coating also in more aggressive environments such as acids and *** study investigated the electrochemical corrosion behaviour of bare and graphene-coated(by chemical vapour deposition(CVD))Ni and Cu in 0.5 M H_(2)SO_(4),0.1 M NaCl and 0.5 M NaOH *** tests and post corrosion characterisation revealed the improvement in the corrosion resistance of Ni due to multilayer graphene coating to be similar in the three solutions,i.e.,the robustness of the barrier property of the multilayer graphene is largely unaffected by the aggressiveness of the corrosive ***,the improvement in corrosion resistance of bare Ni due to multilayer graphene is considerably greater(nearly 3 orders of magnitude)in the most aggressive of the test solutions(0.5 M H_(2)SO_(4)).The improvement is considerably less in 0.5 M NaOH because bare Ni develops a robust passive layer in highly alkaline *** improvement in corrosion resistance of bare Cu is limited(within an order of magnitude)in the three solutions because Cu develops only 1-2 layers of graphene.

关键词： CVD graphene coatings Electrochemical impedance spectroscopy(EIS) Potentiodynamic polarization(PDP) Raman spectroscopy

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On Complete Bicubic Fractal Splines

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Applied Mathematics 2010年第3期1卷 200-210页

作者： arya k.mar Bedabrata Chand maría A. Navascués 不详

Fractal geometry provides a new insight to the approximation and modelling of experimental data. We give the construction of complete cubic fractal splines from a suitable basis and their error bounds with the original function. These univariate properties are then used to investigate complete bicubic fractal splines over a rectangle Bicubic fractal splines are invariant in all scales and they generalize classical bicubic splines. Finally, for an original function , upper bounds of the error for the complete bicubic fractal splines and derivatives are deduced. The effect of equal and non-equal scaling vectors on complete bicubic fractal splines were illustrated with suitably chosen examples.

关键词： Fractals Iterated Function Systems Fractal Interpolation Functions Fractal Splines Surface Approximation

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Fractal Interpolation Functions: A Short Survey

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Applied Mathematics 2014年第12期5卷 1834-1841页

作者： maría Antonia Navascués arya k.mar Bedabrata Chand Viswanathan Puthan Veedu maría Victoria Sebastián Centro Universitario de la Defensa de Zaragoza Academia General Militar Zaragoza Spain Departamento de Matemática Aplicada EINA Universidad de Zaragoza Zaragoza Spain Department of Mathematics Indian Institute of Technology Madras Chennai India

The object of this short survey is to revive interest in the technique of fractal interpolation. In order to attract the attention of numerical analysts, or rather scientific community of researchers applying various approximation techniques, the article is interspersed with comparison of fractal interpolation functions and diverse conventional interpolation schemes. There are multitudes of interpolation methods using several families of functions: polynomial, exponential, rational, trigonometric and splines to name a few. But it should be noted that all these conventional nonrecursive methods produce interpolants that are differentiable a number of times except possibly at a finite set of points. One of the goals of the paper is the definition of interpolants which are not smooth, and likely they are nowhere differentiable. They are defined by means of an appropriate iterated function system. Their appearance fills the gap of non-smooth methods in the field of approximation. Another interesting topic is that, if one chooses the elements of the iterated function system suitably, the resulting fractal curve may be close to classical mathematical functions like polynomials, exponentials, etc. The authors review many results obtained in this field so far, although the article does not claim any completeness. Theory as well as applications concerning this new topic published in the last decade are discussed. The one dimensional case is only considered.

关键词： Fractal Curves Fractal Functions Interpolation Approximation

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Case of victims of modern imaging technology:Increased information noise concealing the diagnosis

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World Journal of Radiology 2017年第12期9卷 454-458页

作者： abhishek Mahajan G V Santhoshk.mar Ameya Shirish kawthalkar Richa Vaish Nilesh Sable Supreeta arya Subhash Desai Department of Radiodiagnosis and Imaging Tata Memorial HospitalMumbai 400012India

We present a case of tubercular arthritis who underwent numerous unnecessary investigations what is known as "victims of modern imaging technology" or VOMIT. Today there is an exponential rise in the volume of the medical imaging, part of which is contributed by unnecessary and unjustified indications. We discuss about the untoward effects of the uninhibited and careless use of modern imaging modalities and possible ways to avoid. Skeletal manifestation of the tuberculosis is still common in the endemic countries like India. Although the final diagnosis of the skeletal tuberculosis like tubercular arthritis is made by bacteriological and histological studies, few demographic, clinical and radiological features might help making early diagnosis.

关键词： Radiology Modern imaging Patient care Healthcare costs Tubercular arthritis Diagnostic imaging overuse

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