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SECTIONAL ANALYTICITY IN SEQUENCE SPACES
T. Balasubramanian,A.Pandiarani,T.Tamizh Chelvam 한국수학교육학회 2010 純粹 및 應用數學 Vol.17 No.2
The object of the present paper is to introduce ¤-dual and the concept of sectional analyticity (Abschinitts-anatytique or AA property) of an FK-space. The motivation for AA-property is that a sequence space having AK-property pos-sess AA-property.
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.
( T. Senthil Kumar ),( V. Balasubramanian ),( S. Babu ),( M. Y. Sanavullah ) 대한금속재료학회 ( 구 대한금속학회 ) 2007 METALS AND MATERIALS International Vol.13 No.4
AA6061 aluminium alloy (Al-Mg-Si alloy) has gathered wide acceptance in the fabrication of food processing equipment, chemical containers, passenger cars, road tankers, and railway transport systems. The preferred process for welding these aluminium alloys is frequently Gas Tungsten Arc (GTA) welding due to its comparatively easy applicability and lower cost. In the case of single pass GTA welding of thinner sections of this alloy, the pulsed current has been found beneficial due to its advantages over the conventional continuous current processes. The use of pulsed current parameters has been found to improve the mechanical properties of the welds compared to those of continuous current welds of this alloy due to grain refinement occurring in the fusion zone. In this investigation, an attempt has been made to develop a mathematical model to predict the fusion zone grain diameter incorporating pulsed current welding parameters. Statistical tools such as design of experiments, analysis of variance, and regression analysis are used to develop the mathematical model. The developed model can be effectively used to predict the fusion grain diameter at a 95 % confidence level for the given pulsed current parameters. The effect of pulsed current GTA welding parameters on the fusion zone grain diameter of AA 6061 aluminium alloy welds is reported in this paper.
Mechanical and metallurgical properties of diffusion bonded AA2024 Al and AZ31B Mg
Mahendran, G.,Balasubramanian, V.,Senthilvelan, T. Techno-Press 2012 Advances in materials research Vol.1 No.2
In the present study, diffusion bonding was carried out between AZ31B magnesium and AA2024 aluminium in the temperature range of $405^{\circ}C$ to $475^{\circ}C$ for 15 min to 85 min and 5MPa to 20 MPa uniaxial loads was applied. Interface quality of the joints was assessed by microhardness and shear testing. Also, the bonding interfaces were analyzed by means of optical microscopy, scanning electron microscopy, energy dispersive spectrometer and XRD. The maximum bonding and shear strength was obtained at $440^{\circ}C$, 12 MPa and 70 min. The maximum hardness values were obtained from the area next to the interface in magnesium side of the joint. The hardness values were found to decrease with increasing distance from the interface in magnesium side while it remained constant in aluminium side. It was seen that the diffusion transition zone near the interface consists of various phases of $MgAl_2O_4$, $Mg_2SiO_4$ and $Al_2SiO_5$.
Baby, Sony,Balasubramanian, T.,Pardikar, R. J. 한국비파괴검사학회 2003 한국비파괴검사학회지 Vol.23 No.3
Parametric studies have been conducted into the variability of the factors affecting the ultrasonic testing applied to weldments. The influence of ultrasonic equipment, transducer parameters, test technique, job parameters, defect type and characteristics on reliability for defect detection and sizing was investigated by experimentation. The investigation was able to build up substantial bank of information on the reliability of manual ultrasonic method for testing weldments. The major findings of the study separate into two parts, one dealing with correlation between ultrasonic techniques, equipment and defect parameters and inspection performance effectiveness and other with human factors. Defect detection abilities are dependent on the training, experience and proficiency of the UT operators, the equipment used, the effectiveness of procedures and techniques.
Durability performance of CNT and nanosilica admixed cement mortar
Lee, Han Seung,Balasubramanian, B.,Gopalakrishna, G.V.T.,Kwon, Seung-Jun,Karthick, S.P.,Saraswathy, V. Elsevier 2018 Construction and Building Materials Vol.159 No.-
<P><B>Abstract</B></P> <P>In the recent years, development and use of nanomaterials are gaining importance in the construction industries due to the advancement of science and technology. In the present investigation, nanosilica (NS) was synthesized from rice husk ash and characterized using XRD, Particle size analysis and SEM techniques. 1% NS by weight was used in cement mortar along with carbon nano tube (0.01%–0.07%) as a cement replacement materials and rock dust (RD) was used as a replacement for river sand. Five different mix combinations were formulated. Polycarboxylate based water reducing admixture was used for improving the workability of the mix. All the combination of mixes derived were subjected to compression, split tensile test, and durability studies such as sorptivity, water absorption, and chloride penetration test. Potentiodynamic polarization study was carried out to understand the corrosion performance of the composite cement mortar. SEM and XRD studies were carried out for the hydrated products of the composite cement mortar. The results showed that NS and CNT increased the compressive strength by 12%–76% and enhanced the corrosion resistance properties than the control.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The synergistic effect of NS with CNT composite cement mortar was investigated. </LI> <LI> Strength and durability properties were enhanced by the addition of NS and CNT. </LI> <LI> Polarization study revealed that the corrosion resistance was enhanced. </LI> <LI> SEM and XRD confirmed that NS and CNT accelerated the hydration process and resulted in denser microstructure formation. </LI> </UL> </P>
조수현,정원식,홍지숙,김범영,한가람,Leandersson M.,Balasubramanian T.,Arita Masashi,Shimada Kenya,심지훈,김창영,박승룡 한국물리학회 2021 Current Applied Physics Vol.30 No.-
Material family of zinc blende structure semiconductors (ZBSSs) is important for novel technique such as spintronics. A study of the ZBSS spin-splitting structure in momentum space is essential when seeking to understand the exotic properties of the material. The Dresselhaus field predominates in the bulk, but the Rashba field plays important roles in states near the surface. Here, we used circular dichroism in angle-resolved photoemission spectroscopy (CD-ARPES) to explore the spin-splitting structure of bulk ZBSS in momentum space. The observed structure was well-explained by a Dresselhaus field attributable to the lack of inversion symmetry in ZBSS crystals. We show that CD-ARPES usefully reveals spin-splitting in momentum space. CD-ARPES combined with hard x-ray incident-beam would be useful to investigate the spin-splitting structures of the interface states in the ZBSS heterostructure.
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.