Articles

The level of nonlinearity in the dynamics of the daily mean air temperature data series over Michigan Grate Lake has been examined using appropriate statistical tools. The time series is collected from the database of Tides and Currents under the National Oceanic and Atmospheric Administration (NOAA), Menominee, MI, Station ID: 9087088, length 1584 days from 14th March, 2011 to 14th July, 2015 for this purpose. The raw data has been pre-processed using simple exponential smoothing and discrete wavelet transform (DWT) based denoising. To gauge the extent of nonlinearity under the dynamics of the test series, delay vector variance (DVV) strategy is applied. The study yields that the fluctuation of daily mean air temperature over Michigan Great Lake poses deterministic, regular, non-linear behaviour in the temporal domain.

This paper presents the generalized mathematical modelling and state space model of dc motor. The performance of dc motor under various conditions is simulated using MATLAB/SIMULINK environment and simulation result demonstrates the feasibility of the proposed system.

In this 21st century, it is worth to saying the need for a vehicle, from four-wheelers to two-wheelers the demand of vehicle in the automobile sector is increasing day by day. With the rapid demand for vehicles, it is needless to say the raising of loss of energy in different aspects. In this review article, recovery of the loss of energy when we apply brakes on the wheels will be discussed. When a usual common vehicle applies its brakes, kinetic energy is changed to heat as friction between the brake pads and wheels. This heat is transferred to the system and the energy is effectively wasted. The total amount of energy lost in this way depends on how often, how hard and for how long the brakes are applied. The regenerative implies recovering energy and generating that for a new purpose. In a regenerative braking system, the heat energy which is produced during the application of the brake can be utilized for other purposes say to light up the light or charging up the battery etc. The use of regenerative braking system increases the work output for the same input resulting in better efficiency of the vehicle. This article was carried on to provide comprehensive information about regenerative braking systems. These systems provide economic benefits via fuel savings and prevention of material loss. Their use also contributes to a clean environment and renewable energy sources, which are among the most important issues on the global agenda. More comprehensive studies should be accomplished in this area.