Alvas Institute of Engineering and Technology

South Canara District, India

Alvas Institute of Engineering and Technology

South Canara District, India

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Acharya S.,Alvas Institute of Engineering and Technology | Bhat N.N.,Bhabha Atomic Research Center | Joseph P.,Mangalore University | Sanjeev G.,Mangalore University | And 2 more authors.
Radiation and Environmental Biophysics | Year: 2011

The effects of single pulses and multiple pulses of 7 MV electrons on micronuclei (MN) induction in cytokinesis-blocked human peripheral blood lymphocytes (PBLs) were investigated over a wide range of dose rates per pulse (instantaneous dose rate). PBLs were exposed to graded doses of 2, 3, 4, 6, and 8 Gy of single electron pulses of varying pulse widths at different dose rates per pulse, ranging from 1 × 10 6 Gy s -1 to 3.2 × 10 8 Gy s -1. Different dose rates per pulse were achieved by changing the dose per electron pulse by adjusting the beam current and pulse width. MN yields per unit absorbed dose after irradiation with single electron pulses were compared with those of multiple pulses of electrons. A significant decrease in the MN yield with increasing dose rates per pulse was observed, when dose was delivered by a single electron pulse. However, no reduction in the MN yield was observed when dose was delivered by multiple pulses of electrons. The decrease in the yield at high dose rates per pulse suggests possible radical recombination, which leads to decreased biological damage. Cellular response to the presence of very large numbers of chromosomal breaks may also alter the damage. © 2011 Springer-Verlag.


Diwaker,Indian Institute of Technology Mandi | Chidan Kumar C.S.,Universiti Sains Malaysia | Chidan Kumar C.S.,Alvas Institute of Engineering and Technology | Kumar A.,Indian Institute of Technology Mandi | And 4 more authors.
Journal of Molecular Structure | Year: 2015

The title compound, 2-(4-bromophenyl)-2-oxoethyl 3-methylbenzoate, has been synthesized and characterized using experimental FTIR, 1H and 13C NMR, single crystal XRD and various theoretical methods (FTIR, NMR, electronic and band gap studies). The compound crystallizes in monoclinic space group P21/c with a = 8.176 (2) Å, b = 7.82 (2) Å, c = 2.952 (6) Å, β = 91.330 (4)° and Z = 4. The initial coordinate geometry obtained by XRD is further used to obtain the optimized ground state geometry of the investigated compound using HF and DFT/B3LYP/6-311++G(2d,2p) level of theory. Geometrical parameters, vibrational frequencies, (GIAO) 1H and 13C NMR chemical shifts have been calculated theoretically using the optimized ground state geometry. Apart from this, density of states of different atoms, total density of states and band gap studies have also been successfully studied using theoretical models. © 2015 Elsevier B.V. All rights reserveds.


Udaya,NMAM Institute of Technology | Fernandes P.,Alvas Institute Of Engineering And Technology
Materials Science Forum | Year: 2015

The paper illustrates Carbon nanotubes reinforced pure Al (CNT/Al) composites and fly ash reinforced pure Al (FA/Al) composites produced by ball-milling and sintering. Microstructures of the fabricated composite were examined and the mechanical properties of the composites were tested and analysed. It was indicated that the CNTs and fly ash were uniformly dispersed into the Al matrix as ball-milling time increased with increase in hardness. © (2015) Trans Tech Publications, Switzerland.


Satyanarayan,Alvas Institute Of Engineering And Technology | Prabhu K.N.,National Institute of Technology Karnataka
Materials Science Forum | Year: 2015

In the present work, the bond strength of Sn-0.7Cu, Sn-0.3Ag-0.7Cu, Sn-2.5Ag-0.5Cu and Sn-3Ag-0.5Cu lead free solders solidified on Cu substrates was experimentally determined. The bond shear test was used to assess the integrity of Sn–Cu and Sn–Ag–Cu lead-free solder alloy drops solidified on smooth and rough Cu substrate surfaces. The increase in the surface roughness of Cu substrates improved the wettability of solders. The wettability was not affected by the Ag content of solders. Solder bonds on smooth surfaces yielded higher shear strength compared to rough surfaces. Fractured surfaces revealed the occurrence of ductile mode of failure on smooth Cu surfaces and a transition ridge on rough Cu surfaces. Though rough Cu substrate improved the wettability of solder alloys, solder bonds were sheared at a lower force leading to decreased shear energy density compared to the smooth Cu surface. A smooth surface finish and the presence of minor amounts of Ag in the alloy improved the integrity of the solder joint. Smoother surface is preferable as it favors failure in the solder matrix. © (2015) Trans Tech Publications, Switzerland.


Bhat J.I.,Mangalore University | Shetty M.K.,Alvas Institute of Engineering and Technology
Journal of Chemical and Engineering Data | Year: 2010

The electrical conductance of sulfathiazole sodium in water and different volume fractions of water + dimethyl sulfoxide (DMSO) and water + ethanol in the temperature range of (283 to 313) K has been measured. Kraus-Bray and Shedlovsky models of conductivity were used for analyzing the conductance data. The limiting ionic conductance, limiting molar conductance, and association constant, Ka, have been determined. On the basis of the viscosity of the solvent, the Walden product and Stokes molecular radius were also determined. © 2010 American Chemical Society.


Adyanthaya S.K.,Alvas Institute of Engineering and Technology | Vijaya P.A.,Malnad College of Engineering
Lecture Notes in Electrical Engineering | Year: 2014

In the present IT era, there is a great need of fully automated industrial system. With the growing popularity of Internet and the development of embedded technology, Web technology has been extended to the development and application of embedded system. In the future pervasive computing environment, people would be surrounded by a great multitude of microcomputers that would be embedded in home appliances, factory devices, and so on. It is a better choice for these devices to be embedded a Web server. An embedded Web server (EWS) is a microcontroller that contains an Internet software suite as well as application code for monitoring and controlling systems. The main aim of the project discussed in this paper is to use the personal computer (PC) with the Ethernet card to send the messages to remote locations which is received by the 32-bit ARM processor in order to control the devices in the real-time environment. By using this project, it is possible to change the status (ON/OFF) of any appliance connected to ARM processor board via Internet. The messages from the PC can also be sent to any remote locations in the world using this technology. The codes for the implementation of this project have been written in embedded C language as it is easy to understand and is suitable for the embedded system design. This project has been designed for monitoring and controlling the status of two devices. The client can monitor and control the status (ON/OFF) of the devices via Internet from any corner of the world. © 2014 Springer India.


Chidan Kumar C.S.,Universiti Sains Malaysia | Chidan Kumar C.S.,Alvas Institute of Engineering and Technology | Loh W.-S.,Universiti Sains Malaysia | Ooi C.W.,Universiti Sains Malaysia | And 3 more authors.
Molecules | Year: 2013

Chalcone derivatives have attracted increasing attention due to their numerous pharmacological activities. Changes in their structures have displayed high degree of diversity that has proven to result in a broad spectrum of biological activities. The present study highlights the synthesis of some halogen substituted chalcones 3(a-i) containing the 5-chlorothiophene moiety, their X-ray crystal structures and the evaluation of possible biological activities such as antibacterial, antifungal and reducing power abilities. The results indicate the tested compounds show a varied range of inhibition values against all the tested microbial strains. Compound 3c with a p-fluoro substituent on the phenyl ring exhibits elevated antimicrobial activity, whereas the compounds 3e and 3f displayed the least antimicrobial activities. The compounds 3d, 3e, 3f and 3i showed good ferric and cupric reducing abilities, and the compounds 3b and 3c showed the weakest reducing power in the series. © 1996-2013 MDPI AG.


Chidan Kumar C.S.,Universiti Sains Malaysia | Chidan Kumar C.S.,Alvas Institute of Engineering and Technology | Loh W.-S.,Universiti Sains Malaysia | Ooi C.W.,Universiti Sains Malaysia | And 3 more authors.
Molecules | Year: 2013

A series of six novel heterocyclic chalcone analogues 4(a-f) has been synthesized by condensing 2-acetyl-5-chlorothiophene with benzaldehyde derivatives in methanol at room temperature using a catalytic amount of sodium hydroxide. The newly synthesized compounds are characterized by IR, mass spectra, elemental analysis and melting point. Subsequently; the structures of these compounds were determined using single crystal X-ray diffraction. All the synthesized compounds were screened for their antioxidant potential by employing various in vitro models such as DPPH free radical scavenging assay, ABTS radical scavenging assay, ferric reducing antioxidant power and cupric ion reducing antioxidant capacity. Results reflect the structural impact on the antioxidant ability of the compounds. The IC50 values illustrate the mild to good antioxidant activities of the reported compounds. Among them, 4f with a p-methoxy substituent was found to be more potent as antioxidant agent. © 1996-2013 MDPI AG.


Ramadevi P.,Jawaharlal Nehru Technological University | Ramadevi P.,KLE University | Sampathkumar D.,Jawaharlal Nehru Technological University | Sampathkumar D.,KLE University | And 2 more authors.
BioResources | Year: 2012

Environmentally beneficial composites can be made by replacing synthetic fibers with various types of cellulosic fibers. Fibers from pine wood, coir, sisal, abaca, coir, etc. are all good candidates. The most important factor in finding good fiber reinforcement in the composites is the strength of adhesion between matrix polymer and fiber. Due to the presence of hydroxyl groups and other polar groups in various constituents of abaca, the moisture absorption is high, which leads to poor wettability and weak interfacial bonding between fibers and the more hydrophobic matrices. Therefore, it is necessary to impart a hydrophobic nature to the fibers by suitable chemical treatments in order to develop composites with better mechanical properties. In the present work, the effect of alkali treatment on the moisture absorption tendency of single abaca fiber was investigated. The results shown that the alkali treated fiber absorbs less moisture than the untreated raw fiber.


Bhat J.I.,Mangalore University | Shetty M.K.,Alvas Institute of Engineering and Technology
Journal of Molecular Liquids | Year: 2011

The ion solvation behavior of sulfacetamide sodium in water and various volume fractions of ethanol (EtOH) in water in the range of 283 to 313 K, using electrical conductivity principle have been studied. The conductance data were analyzed according to Kraus-Bray and Shedlovsky models of conductivity. The limiting molar conductance λm o, association constant Ka, energy of activation of the rate process (E a), and related thermodynamic parameters have been determined. Using viscosity of the solvent, Walden product (λm oη0) and Stokes molecular radius have been determined. Standard thermodynamic parameters of association (ΔGa, ΔHa,) were calculated and discussed. The limiting molar conductance sharply decreased for the increased amount of ethanol suggesting the increased ion-solvent and solvent-solvent interactions. © 2011 Elsevier B.V.

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