http://nopr.niscpr.res.in/handle/123456789/61933 2026-10-06T19:18:54Z 2026-10-06T19:18:54Z Saraswat, Mukul Sengwa, R J http://nopr.niscpr.res.in/handle/123456789/61939 2023-05-25T07:20:31Z 2023-05-01T00:00:00Z

Title: Multiphysics Experimental Approaches for Insight into the Hydrogen Bonded Structures of Ethylene Glycol and Glycerol Mixtures toward Green Solvent Technology Authors: Saraswat, Mukul; Sengwa, R J Abstract: Alcohols and their mixtures are credited most important polar solvents for advances in pharmaceutical, chemical, biological, thermal, and material technologies. A rigorous study for the characterization of hydrogen bonded heterogeneous intermolecular structures that formed in a mixed solvent based on alcohols containing two and three hydroxyl groups molecules is crucial to specific technological and industrial applications. Hence, in this work, the multiphysics experimental approaches including the measurements of dielectric, electrical, viscous, acoustic, thermal, and optical properties are applied and analyzed to confirm the behaviour of hydrogen bonded molecular structures of ethylene glycol (EG; dihydric alcohol) with glycerol (Gl; trihydric alcohol) over the entire concentration range of EG+Gl mixtures at 298.15 K. The static dielectric permittivity, direct current electrical conductivity, low frequency relaxation time, and refractive index values of the EG+Gl mixtures are reported. Additionally, dynamic viscosity, density, ultrasound velocity, adiabatic compressibility, intermolecular free length, acoustic impedance, free volume, Rao’s constant, Wada constant, and viscoacoustic relaxation time of the EG+Gl mixtures are determined, and also explored their significance to these alcohols molecular interactions. Ultraviolet-visible range absorbance behaviour of the alcohol mixtures is characterized in detail and confirmed the electronic transitions at higher energy ultraviolet radiations. The detailed analysis of all the experimental results along with the consideration of excess properties evidenced the formation of heterogeneous intermolecular hydrogen bonded structures in these Newtonian-type alcohols mixtures. A small to adequate variation in the thermodynamical and other investigated properties with the concentration variation showed that the EG+Gl mixture can be optimized as a green solvent according to the prerequisite properties for huge advances in soft condensed matter technologies. Page(s): 217-238

2023-05-01T00:00:00Z Jain, Harsh Aggarwal, Bhawna Rai, Shireesh Kumar http://nopr.niscpr.res.in/handle/123456789/61938 2023-05-25T07:18:26Z 2023-05-01T00:00:00Z

Title: New Modified Voltage Differencing Voltage Transconductance Amplifier (MVDVTA) based Meminductor Emulator and its Applications Authors: Jain, Harsh; Aggarwal, Bhawna; Rai, Shireesh Kumar Abstract: This paper presents a new modified voltage differencing voltage transconductance amplifier (MVDVTA) based meminductor emulator circuit. The proposed emulator circuit is memristor-less, uses only a single active building block (ABB) and has simple circuitry. The MVDVTA based emulator design consists of only two capacitors and a single resistor. The performance of the proposed design has been verified over a wide frequency span. For simulation purpose LTSpice tool is used with 0.18μm CMOS technology. The proposed emulator has also been employed in chaotic oscillator and adaptive learning application circuit to verify its workability. The proposed design gives satisfactory performance for both the applications, hence confirming its functionality in practical environment. Page(s): 239-246

2023-05-01T00:00:00Z Karmalawi, Abdallah M http://nopr.niscpr.res.in/handle/123456789/61937 2023-05-25T07:16:33Z 2023-05-01T00:00:00Z

Title: Radiometric Traceability for Pyranometer Calibration Based on High Flux LEDs and Reference Detector Authors: Karmalawi, Abdallah M Abstract: This article aims to establish a new system for pyranometer calibration traceable to the radiometric chain. Different spectrum high flux LEDs have been used as tunable irradiance sources. The calibration procedure, uncertainty budget, and traceability chain of the solar irradiance measurements are presented. Additionally, the results were evaluated using a reference pyranometer, calibrated traceable to radiometric traceability and World Radiometric Reference (WRR). The uncertainty values are also estimated to be around 1.19 % (k = 2) for LEDs-based pyranometer-pyranometer calibration (WRR traceability), and about 0.68 % (k = 2) for reference standard radiometer based (Radiometric traceability). The deviation between the reference pyranometer and the pyranometer under test was about 0.8% using LED at 655nm for irradiance of 500 W/m2.The sensitivity results have been evaluated by reference standard pyranometer traceable to WRR using a xenon lamp as a solar source, with a deviation of about 1 %. Page(s): 247-253

2023-05-01T00:00:00Z Singh, Santosh Kumar http://nopr.niscpr.res.in/handle/123456789/61936 2023-05-25T07:14:56Z 2023-05-01T00:00:00Z

Title: Raman and Structural Characterization of Spinel Compound Zn_8/5Al_4/15TiO₄ Authors: Singh, Santosh Kumar Abstract: Microwave dielectric materials have been attracted enormous attention for their application in microwave communication. A new microwave dielectric material with composition Zn8/5Al4/15TiO4 was synthesized by conventional solid-state reaction method. The structure of Zn8/5Al4/15TiO4 was refined with the cubic P4332 space group (number of formula unit per unit cell, Z = 4). The Rietveld refinement study revealed the theoretical density ρ = 4.80 g/cm3 and lattice parameter a = 8.405 Å. This compound was crystallized in cubic spinel structure and 1:3 ordering was observed on the octahedral sites. Raman spectrum of the compound was collected at room temperature. Theoretical Factor group analysis for this compound predicts 40 Raman modes and 22 IR modes. However, experimentally 13 vibrational modes have been observed in the Raman spectrum which can be separated into internal TiO6 vibration and external rotation and translation TiO6 modes. Raman modes in the range of 500-800 cm-1 are assigned to internal vibrational modes. Page(s): 254-257

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