The Wiener index is the one of the oldest and most commonlyused topological indices in the quantitative structure-property relationships. It is defined by the sum of the distances between all (ordered) pairs of vertices of G. In this paper, we use MATLAB program for finding the Wiener index of the vertex weighted, edge weighted directed and undirected graphs

This paper deals with the closed loop operation of semi-dual active bridge(S-DAB) converter for battery charger applications. The semi-dual active bridge (S-DAB) converter is obtained from Dual Active Bridge converter (DAB) by replacing the active (four switches) to semi-active (two switches) on the load side. As the no of switches are less when compared to Dual Active Bridge converter (DAB), it has high efficiency, unidirectional power flow and less stress on switches. Along with the above advantages it undergoes zero voltage switching (ZVS) without the requirements of any active or passive components. A controller is also designed for the enhancement of the closed loop operation of the semi-dual active bridge (S-DAB) converter. Hence it can be used for high/low voltage applications. The complete design and simulation of the semi-dual active bridge (S-DAB) converter with the controller is carried out in MATLAB/ Simulink Keywords-Dual Active Bridge (DAB) Converter; Semi-Dual Active Bridge (S-DAB) Converter; Zero Voltage Switching (ZVS).

This paper proposes fuzzy logic controller based seven-level hybrid inverter for photovoltaic systems with sinusoidal pulse width-modulation (SPWM) techniques. Multi-Level Inverter technology have been developed in the area of high-power medium-voltage energy scheme, because of their advantages such as devices of high dv/dt rating, higher switching frequency, unlimited power processing, shape of output waveform and desired level of output voltage, current and frequency adjustment.This topology can be used there by enabling the scheme to reduce the Total Harmonic Distortion (THD) for high voltage applications. The Maximum Power Point Tracking algorithm is also used for extracting maximum power from the PV array connected to each DC link voltage level. The Maximum Power Point Tracking algorithm is solved by Perturb and Observer method.It has high performance with low Total Harmonic Distortion and reduced by this control strategy. The proposed system has verified and THD is obtained by using MATLAB/simulink.The result is compared with the hardware prototype working model.

In quantum chemistry, the physico-chemical properties of chemical compounds are often modeled by means of molecular-graph-based structure-descriptors, which are also referred to as topological indices. One of the most widely known topological descriptors is Wiener index. It is named after chemist Harold Wiener who introduced in the year 1947. It is defined by the sum of the distances between all (ordered) pairs of vertices of G. In this paper, we find the Wiener index of degree splitting of some aliphatic and aromatic hydrocarbons and classify its characterization using MATLAB.

In the last few decades, the development of wireless and mobile communication has influenced social and economic development. Billions of devices demand wireless connection which runs on data, voice and other applications. The antenna is an integral part of any wireless communication system. From the design perspective, the antenna must be compact, easy to manufacture, and cost-effective. This paper presents a design of a rectangular patch antenna, operating at 2.4GHz. The antenna is initially simulated on CST, required parametric sweep is carried out in terms of length and width of the patch, to resonate at 2.4GHz. The simulated antenna is then printed using a PCB printing machine, PCB Prototyping System, Eleven Lab. The printed antenna was tested using Keysight’s PNA-LN-5232A (Vector Network Analyzer). The measurements/ variation in the reflection coefficient were observed /noted within the vicinity of the human body and gold metal plus the human body, at different positions. Near the ear. The simulation results and measured results are in a good match. The designed antenna is suitable for the Wi-fi, WLAN, communication application.