NOPR Collection:

Molecular structure and vibrational spectra of 2, 4, 6 -trimethylbenzene sulphonyl chloride (FTIR & Raman) by quantum chemical calculations

2020-09-14T06:23:25Z

Title: Molecular structure and vibrational spectra of 2, 4, 6 -trimethylbenzene sulphonyl chloride (FTIR & Raman) by quantum chemical calculations Authors: Sambathkumar, K Abstract: The 2, 4, 6-trimethylbenzene sulphonyl chloride was characterized using IR and Raman spectral data. The molecular electrostatic potential surface of the 2,4,6-trimethylbenzene sulphonyl chloride (TMBS) has been visualized in electropositive potential in the region of the CH3⁺ group and most electronegative potential in the two oxygen atom has strong binding group. The HOMO and LUMO energies and electronic charge transfer confirms that local reactivity and global reactivity descriptors. The rate constant of 2, 4, 6-trimethylbenzene sulphonyl chloride shows strong temperature dependence. Molecular electrostatic potential (MEP) were also calculated for identification. Temperature dependence of various thermodynamic properties like (Cº_p,m, Sº_mand (Hº_m) is increase with increase in temperature for the structure. Page(s): 589-598

Novel Current-Mode Universal Filter using single FTFNTA

2020-09-14T06:21:28Z

Title: Novel Current-Mode Universal Filter using single FTFNTA Authors: Singh, Ravendra; Prasad, Dinesh Abstract: In this paper, a novel universal filter using single Four Terminal Floating Nullor Transconductance Amplifier (FTFNTA), two capacitors and one/two resistor has been proposed. Sensitivity of pole frequency (ω₀) and quality factor (Q₀) is analysed. Workability of proposed filter has been demonstrated by PSPICE simulations in 0.18µm TSMC CMOS technology. Page(s): 599-604

Multiple Bandwidth FIR Filter Design with Adaptive Algorithms for Hearing Aid Systems

2020-09-14T06:19:48Z

Title: Multiple Bandwidth FIR Filter Design with Adaptive Algorithms for Hearing Aid Systems Authors: Mariammal, K; SherinMary, R; Brittopari, J; Vaithiyanathan, D Abstract: Digital Filter design plays a vital role in signal processing and communication applications. This paper proposes a hearing loss system model with Variable Bandwidth FIR Filter (VBF) and adaptive algorithms for the application to listening. The tunable band filter is designed to provide an appropriate sound level. This filter has several sub-filters each of which is designed with set of selected bandwidths. The sub-bands obtained are adjusted with proper magnitude by trial and error method. Algorithms such as Least Mean Square (LMS), Normalized Least Mean Square (NLMS) and Recursive Least Squares (RLS) are incorporated to improve the quality of the signal. The filter thus designed is examined by taking a number of audio signals. The tests on various hearing loss cases with different type of input signal suggest that this method is capable of reproducing a signal which sounds exactly the same as the original signal. The multiple bandwidth filters is analyzed with mild, moderate, profound and severe hearing loss patterns and the results are reported. The matching error is calculated between ideal response and actual response. The result show that the designed filter provides acceptable minimum matching error and it lies in the range 0 to 2.5dB.This filter design is implemented in TMS320C6711 processor and is tested for sinusoidal input signal. Page(s): 605-623

Impact of High Speed Differential Quadrature Amplitude Modulation using Hybrid Optical Amplifier for Super Dense Wavelength Division Multiplexing System

2020-09-14T06:17:29Z

Title: Impact of High Speed Differential Quadrature Amplitude Modulation using Hybrid Optical Amplifier for Super Dense Wavelength Division Multiplexing System Authors: Kumar, Chakresh; Goyal, Rakesh Abstract: In this paper, a Differential Quadrature Amplitude Modulation (DQAM) technique for 200 x100 Gbps Super Dense Wavelength Division Multiplexing (SD-WDM) system is proposed. Optimized rating outcome in terms of the quality factor, bit error rate, crosstalk, and acceptable minor effect of the channel spacing with the support of RAMAN-EDFA-RAMAN Hybrid Optical Amplifier (HOA) is reported. Page(s): 624-628