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South Canara District, India

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. Source

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. Source

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. Source

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. Source

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. Source

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