Vel Technology Drrr And Drsr University

Chennai, India

Vel Technology Drrr And Drsr University

Chennai, India
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Mahalingam A.,Vel Technology Drrr And Drsr University | Devarajan Y.,Vel Technology Drrr And Drsr University | Radhakrishnan S.,SRM University | Vellaiyan S.,Vel Technology Drrr And Drsr University | Nagappan B.,Sathyabama University
Alexandria Engineering Journal | Year: 2017

High cetane number and energy content of octanol can be an excellent alternative fuels for existing diesel engines. It is necessary to have an extensive analysis on octanol as. an additive in diesel engines. In this study neat mahua oil biodiesel is blended with different proportion of octanol in stationary diesel engine to observe its emission characteristics. Mahua oil biodiesel is prepared by conventional transesterification. The main aim of this study is to reduce various emissions of mahua oil biodiesel by appending octanol. This study discovered a significant reduction in all the emissions associated with mahua oil biodiesel by appending octanol at different proportions. © 2017 Faculty of Engineering, Alexandria University.


Krishnamoorthy D.,Vel Technology Drrr And Drsr University | Prasanna V.,Vel Technology Drrr And Drsr University | Ramachandran K.,Vel Technology Drrr And Drsr University | Pal S.,Vel Technology Drrr And Drsr University
IEICE Electronics Express | Year: 2015

In the conventional second order, single bit, discrete ΔΣ Modulator (DSM), the sampling of input signal and DSM operation is performed at the same frequency. In this conventional DSM, signal to noise ratio (SNR) starts falling down rapidly when the modulus of normalized input signal is above 0.47. The integrators output become arbitrarily large which make the system unstable by saturating the operational amplifiers used in the circuit. There are recent papers in which the modulus of normalized input signal can be increased up to 0.7. In the present paper, a second order DSM with different sampling frequency and DSM clock frequency is proposed. The operating period of the proposed DSM is proportional to the sampled analog input signal. The proposed DSM can operate for the full range of normalized input signal (−1 to +1), has better signal to noise ratio (SNR) in the higher range and can be realized using cmos circuit of supply voltage ±1.5 V. The maximum bound on the integrators outputs is 1.5 V. The proposed DSM has unidirectional output and the oscillation at the output for zero input is no longer present and these properties are essential to drive stepper motors which are the actuators for control valves in industry. In the output spectrum near the signal frequency, the noise level is well below the signal level. The proposed DSM results in low power, stable full range operation with better SNR and power spectral density (PSD). © IEICE 2015.

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