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1,521 results on '"Mani, N."'

26. Study on FR4 substrate backed flaring antenna structure for wideband applications

Author

Keerthana S., Indumathi G., Mani N. Naveen, and Nishanth R.

Subjects
Environmental sciences, GE1-350
Abstract

A class of planar antenna which offers better performance over broad band of frequencies that fits itself in wide range of applications are in need of research. The license free band from 3.1 GHz to 10.6 GHz that do not cause interference to narrowband signals is chosen as operating range of frequencies for the chosen Vivaldi antenna. The novelty of the proposed work consists in the remodeling of a mathematical equations for elliptic antenna structure and the study of the Vivaldi antenna operating over the frequency range between 2.63 GHz to 14.58 GHz that lies in Super High Frequency (SHF) bands – S, C and X bands. The designed antenna is fabricated and its radiation characteristics are studied and analyzed. Purpose. Analysis of the designed antenna on the basis of an elliptical curve mathematical model will allow the antenna to operate over wide band of frequencies thus extending its applications over the areas of application in the areas of satellite communication, military, weather radar, surface ship radar. Methods. The antenna is being designed using HFSS software and fabricated antenna is being tested at anechoic chamber. Results. A mathematical model of a structure of Vivaldi antenna was developed and studied. The performance measures of designed antenna such as return loss, gain, VSWR and radiation pattern are simulated and analyzed. The antenna is being fabricated and tested using vector network analyzer and anechoic chamber. Practical value. The analysis of designed antenna over wide band of frequencies is demonstrated. The further research directions of the designed antenna can be extended for the subsequent implementation of the results in suitable applications.

Published
2023
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30. Evaluation of Secondary Metabolites of Ageratina adenophora and Synthesis of Silver Nanoparticles for its Antibacterial and Antioxidant Activity

Author

Latha Maheswari B, Mani N Mani N, Kavikala N Kavikala N, Karthika S Karthika S, and Rajasudha V Rajasudha V

Subjects
Drug Discovery, Environmental Chemistry, General Chemistry, Biochemistry
Abstract

Synthetic antibiotics have been successfully utilized for decades against pathogenic bacteria to control infectious diseases. However, the continuous and overuse has resulted in multidrug resistant (MDR) bacterial species. Further, the negative side effects caused by commercial antibiotics also hindered their usage. The phytochemicals produced by plants in response to adverse biotic and abiotic conditions possess significant pharmacological properties and can be an effective alternative to synthetic antibiotics. The phytochemicals of Ageratinaadenophora, served the role of reducing and stabilizing agent. Ageratinaadenophora mediated silver nanoparticles (Aa-AgNPs) were characterized using advanced spectroscopic instrumentation. The qualitative analysis by GC-MS showed Methyl ionone, 2(3H)-Naphthalenone, 4, 4a, 5, 6, 7, 8- hexahydro-4a,7,7-trimethyl-(R), Isolongifolone as the major compounds. The quantitative estimation showed leaves were rich in total phenol, flavonoids, alkaloids and tannins. The Aa-AgNPs were effective in inhibiting bacterial pathogens. Further, A.adenophora mediated nanoparticles possessed strong antioxidant activity.

Published
2023

33. Secure Voice Enabled Text Chat Application

Author

null Venkatesh B, null Bala Kumar V, null Jothi Mani N, and null Kirutheeswaran M. S

Subjects
General Earth and Planetary Sciences, General Environmental Science
Abstract

Both the written and audio files can be uploaded to the chat programme. Everyone carries a cellphone in the current world, however not all users have the most recent models, making the majority of native programmes incompatible with those systems. Any device, including computers and handsets, can access the online application because it is a text- and audio-enabled chat system. You can also form a group called "channel" where everyone is able to chat simultaneously in text and audio. In contrast to other chat programmes, the channel does not impose any restrictions on its users. Still, we have applications that allow for an unlimited number of members on a specific channel. but they may need some amount of money to utilise the feature or enable the feature. The application has a feature of speech-to-text conversion, so that the speech can be converted into text. The project is secured with end-to-end encryption, so the security of the application is also provided.

Published
2023

50. Introduction

Author

West, Amy E., primary, Weinstein, Sally M., additional, and Pavuluri, Mani N., additional

Published
2017
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