Kanathur, India
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Karthik S.,Amet University
21st Offshore Symposium 2016: Emerging Offshore Technology and Deepwater Trends | Year: 2016

The underwater welding is the emerging technology of the present and the future. Many offshore platforms and ships need the underwater welding process during emergency. There exist many research institutes globally in developing techniques for underwater welding. A dire need for developing the underwater vehicle for welding processes in marine applications. The recent developments in the underwater vehicles have led to a revolutionary change in the design and system development for coastal surveillance, sea bed inspection and ocean bed exploration. This paper presents a review in implementation of a robot arm for an autonomous underwater welding vehicle. It deals with review of various underwater welding techniques for marine applications and structured such a manner all aspects of underwater welding process with robot manipulator as per the classification requirements. A brief review of its characteristics, applications and the risk mitigation factors of underwater welding techniques for marine applications. The end residt is a model that provides accurate predictions for the joint torques of a two-link robot arm in a simple form implemented with algorithms for precision planning and control during underwater welding application. Copyright 2016, The Society of Naval Architects and Marine Engineers.

Gopinath S.,AMET University
RINA, Royal Institution of Naval Architects - Design and Operation of Wind Farm Support Vessels 2015, Papers | Year: 2015

The service durability and safety of a vessel can be assessed to its peak only in harsh conditions. Usage of eLORAN (Enhanced LOng RAnge Navigation) as a backup and support for navigation system in place of GPS, which tends to fail in harsh conditions is suggested. The paper evaluates the navigation and safety system of wind farm support vessels with accordance to modern classification rules and projects the usage of new rules for a robust service in all sea conditions. © 2015: The Royal Institution of Naval Architects.

Sagadevan S.,AMET University | Pal K.,Wuhan University
Journal of Materials Science: Materials in Electronics | Year: 2017

The controlled synthesis of TiO2/SiO2/CdS-nanocomposites fabrication by hydrothermal assisted route has been successfully performed. Without any doubt this novel strategy is one of the central issues in current Nanotechnology and Materials Science. Those hybrid nanocomposites were characterized by spectroscopes and electron microscopic in several investigations, e.g. X-ray diffraction (XRD), Raman spectroscopy, UV–visible spectroscopy, Scanning electron microscope (SEM) and dielectric dispersion. The average grain size was found to be 28 nm by using X-ray diffraction analysis and nanocomposites were confirmed by the Scanning Electron Microscopy (SEM). The well crystalline distinguishable peak shifts of individual composite materials (e.g. Anatase titanium, SiO2, CdS) were carried out by the Raman spectrum. Indeed, optical properties were obtained by UV–visible absorption spectrum and the calculated optical band gap of the nanocomposite was found to be 3.31 eV. Moreover, typical investigations of dielectric behavior, e.g. dielectric constant, dielectric loss, and AC conductivity properties were also carried out at different frequencies and ambient conditions of temperatures. A successful attempt revealed through this performance puts the hybrid nanostructure at the top level in the state of the art in application oriented research in high crystalline composite materials. © 2017 Springer Science+Business Media New York

Chithambaram V.,AMET University | Das S.J.,Loyola College | Krishnan S.,R M K Engineering College
Journal of Alloys and Compounds | Year: 2011

Bisthiourea lead acetate Pb[SC(NH2)2] 2(CH3COO)2), a novel semi organic non linear optical crystal having dimensions 17 mm × 2 mm × 2 mm were grown using slow evaporation technique. The lattice parameters for the grown crystals were determined using single crystal XRD. The presence of functional groups for the grown crystals was confirmed using Fourier transform infrared (FT-IR) spectroscopy. The optical absorption studies show that the material has wide optical transparency in the entire visible region. The dielectric constant and dielectric loss has been studied as a function of frequency for various temperatures and the results were discussed in detail. The second harmonic generation was confirmed by Kurtz powder method and it is found to be 5 times than that of potassium dihydrogen phosphate (KDP) crystal. © 2011 Elsevier B.V. All rights reserved.

Anand B.,Mahendra Engineering College | Balasubramanian V.,AMET University
E-Journal of Chemistry | Year: 2011

The inhibition efficiency (IE) of an aqueous extract of Allamanda blanchetii (Purple) in controlling corrosion of mild steel which has been evaluated by weight loss method in the absence and presence of corrosion inhibitor at different time intervals at room temperature. The result showed that the corrosion inhibition efficiency of Allamanda blanchetii was found to vary with different time interval and different acid concentrations. Also, it was found that the corrosion inhibition behavior of Allamanda blanchetii is greater in sulphuric acid than citric acid medium. So Allamanda blanchetti can be used as a good inhibitor for preventing mild steel material. The surface analysis study confirms the corrosion of the mild steel and its inhibition by the inhibitor Allamanda blanchetii.

Pure and doped (Ni2+ and Cu2+) SnO2 nanoparticles was successfully synthesized by facile hydrothermal technique. The particles size, structure, morphology and composition of the samples were characterized by X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HR-TEM) and energy dispersive X-ray analysis (EDX) spectroscopy. The optical properties of the samples were analyzed by ultraviolet-visible (UV-vis) and photoluminescence (PL) spectroscopy. The optical band gap energies of pure, Cu and Ni doped SnO2 nanoparticles were calculated to be 3.76, 3.83 and 3.87 eV, respectively. The PL emission spectrum shows that a strong luminescence peak located at 397 nm, which can be attributed to the near band-to-band edge transition recombination of electron-hole pairs. The smaller particle size of SnO2 nanoparticles showed apparent quantum confinement effects. Finally, the mechanism for the formation of quantum size SnO2 was also discussed.

Bhardwaj S.,AMET University
WMU Journal of Maritime Affairs | Year: 2013

While it is said that merchant ships are now so automated and sufficiently reliable for little skill to be demanded of those who control them, on the other hand, it is also argued that today's merchant ships are so complicated that only those who fully comprehend their complexities should be entrusted with their operation. This paper attempts to obtain more insight into this paradox and systematically examines the technological imperative in shipping and its accompanying challenges particularly the skilling dilemma. It then delves into the contrasting theories of technological change implications in the work environment before arriving at the plausible correct understanding that appears to provide the viable explanations and solution. © 2013 World Maritime University.

Single crystals of glycine-phthalic acid (GPA) were grown by slow evaporation process using aqueous solution. X-ray diffraction analysis was used to examine its cell structure and it was found that the GPA crystal corresponded to the orthorhombic system. To identify absorption range and cut-off wavelength for the GPA crystal, UV-visible spectrum was recorded. UV-visible spectroscopy was used to study the optical constants such as the refractive index, the extinction coefficient, electrical susceptibility, and optical conductivity. As a function of different frequencies and temperatures, the dielectric constant and the dielectric loss were examined. The electrical properties like plasma energy, Penn gap, Fermi energy, and polarizability were determined for the analysis of the second harmonic generation (SHG). Using the Kurtz powder technique, the SHG of the GPA crystal was studied. Investigations relating to hysteresis were carried out to ascertain the ferroelectric nature of the material. © 2016 The Minerals, Metals & Materials Society

The optically transparent and bulk single crystal of potassium boro-oxalate (KBO) was grown by slow evaporation technique. Single crystal X-ray diffraction analysis revealed the crystal system and determined lattice parameters. The optical properties of the KBO crystal were determined using UV-vis spectroscopy. Optical constants such as the refractive index, the extinction coefficient, electric susceptibility and optical conductivity were determined from UV-vis spectroscopy. The refractive index of the grown crystal was determined using the Brewster angle method. The presence of various functional groups was verified from the FTIR spectrum. The dielectric constant and the dielectric loss were measured as a function of different frequencies and temperatures. The AC electrical conductivity study revealed that the conduction depended both on the frequency and the temperature. The electrical properties such as plasma energy, Penn gap, Fermi energy and polarizability were calculated to analyze second harmonic generation (SHG). Second harmonic generation (SHG) of KBO crystal was investigated by Kurtz powder technique. © 2016 Elsevier GmbH. All rights reserved.

Sagadevan S.,AMET University
Journal of Optoelectronics and Advanced Materials | Year: 2016

Lead telluride (PbTe) thin films were synthesized using the Chemical Bath Deposition (CBD) technique. X-ray diffraction (XRD) analysis was used to study the structure and the crystallite size of PbTe thin film. The surface morphology of PbTe thin films were studied using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The optical properties were studied using the UV-Visible absorption spectrum. The optical constants such as band gap, refractive index, extinction coefficient and electric susceptibility were determined from UV-Visible absorption spectrum. The dielectric constant, dielectric loss and ac conductivity of the PbTe thin films were studied at different temperatures and frequencies to analyze the electrical properties.

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