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Karjinni V.V.,Sanjay Ghodawat Group Ofinstitutions | Bhavikatti M.A.,Anjuman Institute of Technology and Management
Indian Concrete Journal | Year: 2012

This paper reports the effect of curing methods on the compressive strength of Pavement Quality Concrete (PQC), produced with both Portland Pozzolana Cement (PPC) and Portland Slag Cement (PSC). Concrete mixtures were designed following the revised guidelines given by IS 10262: 2009. A non-chloride hardening accelerator was used for early strength- gain. Slump test for fresh concrete and cube compressive strength for hardened concrete were the measurements carried to evaluate the specimens cured with water and alternatively with a wax based membrane type curing compound. The results suggest that the curing methods did not affect the accelerator's optimum performance which was observed at two day in the case of the pozzolana cement mixtures. However, they did so in the case of slag cement mixtures. The average curing compound efficiency for pozzolana cement mixtures was found to be more than that for the slag cement mixtures. The curing efficiency was more at early ages. Source


Prasanna H.U.,Anjuman Institute of Technology and Management | Udupa K.R.,National Institute of Technology Karnataka
Nuclear Engineering and Design | Year: 2011

Authors have probed into the creep behaviour of AISI 316L stainless steel welds through the indentation creep test methodology and assessed the deterioration effects of these welds under different ageing conditions subjecting them to different test conditions. Comparison is made between the parent metal and the weld metal for integrity at different levels of ageing and test loads. It is concluded that although the aged weld's deteriorated status is not revealed at low temperature and low load test conditions, it is explicitly revealed when tested at higher temperature and higher loads. Microstructural evidences have been given by the authors and they have suggested mechanisms of creep at different test conditions. © 2011 Elsevier B.V. All rights reserved. Source


Shetty C.,National Institute of Technology Karnataka | Kadle A.,Anjuman Institute of Technology and Management
IET Conference Publications | Year: 2013

This paper describes the application of TL494 PSPICE MODEL with OrCAD Capture for analyzing switching regulators, which can assist beginners like undergraduate students in understanding the switching regulators. This paper mainly focuses on application of simulation model as none of the literatures provides required information to work with TL494 simulation model. Although TL494 chip is a very simple chip as far as hardware is concerned, it is not easy work with Pspice model of TL494 without adequate knowledge about the Pspice software. The application of this chip's simulation model with OrCAD Capture is demonstrated with the help of buck converter. This application report can also be extended to other non-isolated as well as isolated converters. Source


Shetty C.,National Institute of Technology Karnataka | Kadle A.,Anjuman Institute of Technology and Management
IET Conference Publications | Year: 2013

In this paper, we present the significance of computer simulation program, such as ORCAD PSPICE, in analyzing, first order approximations of circuit behavior, a closed loop, non-isolated dc-dc converter with synchronous rectifier circuit. Following techniques have been adopted to simplify the process of simulation. They are: (1) Ideal switches are incorporated in the power stage of the converter to eliminate the gate diver requirement which in turn reduces the simulation run time; (2) Diodes are connected in series with switches, which eliminates dead time control circuit, to prevent cross conduction of switches and (3) TL494 Pspice model, which is readily available in library of most of the versions of the ORCAD PSPICE, is employed for pulse width modulation. As an example, non-inverting synchronous buck boost converter is considered for demonstrating the approach. Simulation was carried out for an input voltage range of 6 to 35V and load resistance was varied from 12 to 48 Ohms. Output voltage was regulated at 12V for both input voltage and load current perturbation. Physical prototype was implemented and simulation result was tested for steady state output. Source


Yusoff H.,Universiti Sains Malaysia | Abdullah M.Z.,Universiti Sains Malaysia | Abdul Mujeebu M.,University Putra Malaysia | Ahmad K.A.,Anjuman Institute of Technology and Management
Experimental Techniques | Year: 2015

As part of the ongoing research on micro air vehicles, the present work focuses on the effect of membrane flexibility on the aerodynamic performance of flexible latex flapping wings. Wings with membrane thicknesses 0.37, 0.28, and 0.13 mm are chosen, which are named as least flexible (A), flexible (B), and most flexible (C), respectively. The experiments are performed in an air chamber of size 1.5 m × 1.5 m × 1.5 m, facilitated with wind velocities up to 15 m/s. The time-averaged lift and drag as functions of flapping frequency, forward flight velocity, the angles of attack (AoA), and advance ratio (J). The novel electronic control system developed previously is used to monitor and measure the flapping frequency. It is found that the effect of flexibility on the aerodynamic performance mainly depends on the range of flight speed; at 7200 ≤ Re ≤ 18,000, the lift and drag increase with increase of flexibility, and at 18,000 ≤ Re ≤ 25,200, the lift decreases and drag increases with increase of flexibility. Hence latex compliant (Wing C) wings are advantageous in the low Re range, while the least flexible wing (Wing A) is preferable for higher range. © 2012, Society for Experimental Mechanics. Source

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