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K. Karthick,S. Malarvizhi,V. Balasubramanian,S.A. Krishnan,G. Sasikala,Shaju K. Albert 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.1
Modified 9Cr-1Mo ferritic steel is a preferred material for steam generators in nuclear power plants fortheir creep strength and good corrosion resistance. Austenitic stainless steels, such as type 316LN, areused in the high temperature segments such as reactor pressure vessels and primary piping systems. So,the dissimilar joints between these materials are inevitable. In this investigation, dissimilar joints werefabricated by the Shielded Metal Arc Welding (SMAW) process with Inconel 82/182 filler metals. Thenotch tensile properties and Charpy V-notch impact toughness properties of various regions of dissimilarmetal weld joints (DMWJs) were evaluated as per the standards. The microhardness distribution acrossthe DMWJs was recorded. Microstructural features of different regions were characterized by optical andscanning electron microscopy. Inhomogeneous notch tensile properties were observed across theDMWJs. Impact toughness values of various regions of the DMWJs were slightly higher than the prescribedvalue. Formation of a carbon-enriched hard zone at the interface between the ferritic steel andthe buttering material enhanced the notch tensile properties of the heat-affected-zone (HAZ) of P91. Thecomplex microstructure developed at the interfaces of the DMWJs was the reason for inhomogeneousmechanical properties
Balasubramanian, V .,Guha, B . 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.4
A mathematical model has been developed to predict the fatigue life of Flux Cored Arc Welded (FCAW) cruciform joints containing lack of Penetration (LOP) defect. High strength, Quenched and Tempered steel ASTM 517 'F' Grade bas been used as the base material throughout the investigation. Two level, full factorial technique has been applied to design the experiments. The model has been developed by Response Surface Method (RSM). The adequacy of the model have been checked by ANOVA technique and correlation co-efficient. By using the developed model, fatigue life of flux cared arc welded cruciform joints, containing LOP defects, can be predicted at 95% confidence level.
A Comparative Analysis of Impulse Noise Removal Techniques on Gray Scale Images
V. Murugan,T. Avudaiappan,Dr. R. Balasubramanian 보안공학연구지원센터 2014 International Journal of Signal Processing, Image Vol.7 No.5
Various kinds of images and pictures are required as sources of information for analysis and interpretation. When an image is converted from one form to another such as scanning, transmitting, digitizing, storing etc., degradation occurs to the output image. Hence, the output image needs to be enhanced in order to be better analyzed. Denoising is the one of the pre processing technique in digital image processing. This paper investigates the performance of four denoising methods for removing the High Density Impulse Noise. They are Adaptive Bilateral Filter (ABF), Fuzzy Peer Group Filter (FPGF), Switching Bilateral Filter (SBF), and Boundary Discriminative Noise Detection Filter (BDND).The performance of the above four filters is compared by using five performance metrics. They are Peak-Signal-to-Noise-Ratio, Mean Square Error and Root Mean Square Error. The Experimental results show that the BDND filter based denoising method performs well than the other three methods.
V.S. Vidhya,V. Malathy,T. Balasubramanian,V. Saaminathan,C.Sanjeeviraja,M. Jayachandran 한국물리학회 2011 Current Applied Physics Vol.11 No.3
Nanocrystalline ITO thin films were deposited by the RF sputtering technique using various RF power values keeping the substrates at room temperature. An indepth study of the influence of RF power on the preferential orientation, optical, electrical and surface morphological propertieswas conducted by varying the RF power from 50 W to a maximum of 350 W. X-ray diffraction results confirmed the formation of nanocrystalline ITO films at all RF power values. At 250 W, the ITO films showed preferential orientation along (400) plane. Below and above this power, the films showed (222) orientation. It was observed from the optical transmittance studies that the bandgap value increased from 3.55 to 3.70 eV when the RF power was varied from 50 to 250W. The resistivity value showed a minimumof 4.2 ×10^-3 Ωcm and the grain size reached a maximum of 125 nm for the ITO film deposited at 250 W. The XPS, EDAX and AFM results revealed the formation of stoichiometric and smooth ITO films, which contained nano-sized grains distributed uniformly all over the surface. These results show that the nanocrystalline ITO films deposited with 250 W RF power under the optimized conditions at room temperature, have the required optoelectronic and surface morphological properties useful for the fabrication of devices at a relatively lower temperature.
( M. Balasubramanian ),( V. Jayabalan ),( V. Balasubramanian ) 대한금속재료학회 ( 구 대한금속학회 ) 2007 METALS AND MATERIALS International Vol.13 No.4
Titanium alloy (Ti-6Al-4V) is very widely used in the fabrication of advanced industrial equipment, combat vehicles, gas turbines, spacecraft and so on. The preferred welding process for titanium alloy is gas tungsten arc (GTA) welding due to its comparatively easier applicability and better economy. However, welding of titanium alloy leads to grain coarsening at the fusion zone and the heat-affected zone, and this often results in inferior weld mechanical properties and poor resistance to hot cracking. Hence, in this investigation an attempt has been made to refine the fusion zone microstructure of titanium alloy by using a pulsed current GTA welding process instead of a constant current GTA welding process. Further mathematical models were developed by means of a response surface method, which enabled the process parameters to be optimized to achieve a minimum grain size and maximum hardness in GTA welding of the alloy under study. The parameter optimization involved the use of a response surface, contour plots and Kuhn-Tucker conditions.
ON PAIRWISE FUZZY BASICALLY DISCONNECTED SPACES
Balasubramanian, G.,Chandrasekar, V. The Youngnam Mathematical Society Korea 2002 East Asian mathematical journal Vol.18 No.1
The concept of basic disconnectedness is introduced in the fuzzy bitopological spaces. Besides giving examples and some interesting properties of these spaces, we also establish several characterizations of these spaces.
SOMEWHAT FUZZY ALMOST α-IRRESOLUTE FUNCTIONS
V. Seenivasan,G. Thangaraj,G. Balasubramanian 영남수학회 2010 East Asian mathematical journal Vol.26 No.1
In this paper the concepts of somewhat fuzzy almost α-irresolute functions and strongly somewhat fuzzy β-open functions are introduced and studied. Besides giving characterizations of these func-tions, some interesting properties of these functions are also given.
ON UPPER AND LOWER SEMI-IRRESOLUTE FUZZY MULTIFUNCTIONS
Seenivasan, V.,Balasubramanian, G. The Youngnam Mathematical Society Korea 2007 East Asian mathematical journal Vol.23 No.1
New classes of multifunctions called fuzzy upper and fuzzy lower semi-irresolute (semi-continuous) multifunctions in fuzzy topological spaces are introduced in this paper. We also obtain some characterizations of this class and some basic interesting properties of such fuzzy multifunctions. We discuss mutual relationship and also relationship with other existing such multifunctions.