Government College

About: Government College is a based out in . It is known for research contribution in the topics: Population & Ring (chemistry). The organization has 4481 authors who have published 5986 publications receiving 57398 citations.

A pseudopotential approach to the superconducting state properties of Cu–Zr metallic glasses

Abstract: The superconducting state properties of the metallic glass have been investigated in the BCS - Eliashberg - McMillan framework by extending this theory to the binary metal glasses. Pseudo ions with average properties have been considered to replace both types of ions in the system. Values of the superconducting state parameters, namely electron - phonon coupling strength , Coloumb pseudopotential , transition temperature , isotope effect exponent and interaction strength have been worked out using Ashcroft's potential and the linear potential due to Sharma and Kachhava along with six different forms of dielectric screening. The form factors directly obtained from the screened pseudopotential of Veljkovic and Slavic have also been used to explicitly observe the effect of the dielectric screening on and through . The results obtained established the presence of a superconducting phase in glass.

Effect of addition of Zn impurities on the electronic conduction in semiconducting Se80−xTe20Znx glasses

Abstract: A study of the effect of the addition of Zn impurities on the electronic transport properties of melt-quenched semiconducting glasses in the system Se80-xTe20Znx (x = 0, 1, 2 and 4) has been undertaken for the first time. Measurements of the temperature dependence of the d.c. conductivity and the frequency and temperature dependence of the d.c. conductivity [sgrave]a.c.(ω) and dielectric relaxation have been made in the temperature interval 180–450 K and frequency range 500 Hz–10 kHz. It is revealed that [sgrave]a.c.(ω) is proportional to ω s . The temperature dependence of [sgrave]a.c.(ω) and the parameter s is reasonably interpreted by the correlated-barrier-hopping model. The analysis of the results shows that the electronic conduction in compositions with x = 0 and 1 takes place by a bipolaron-hopping process in the whole temperature range of study. The addition of higher concentrations of Zn impurities (x = 2 and 4) induces new types of defects which contribute predominantly to single-polaro...

Novel task-specific ionic liquid [Et 2 NH(CH 2 ) 2 CO 2 H][AcO] as a robust catalyst for the efficient synthesis of some pyran-annulated scaffolds under solvent-free conditions

Abstract: A novel task-specific ionic liquid, 2-carboxy-N,N-diethylethanaminium acetate denoted as [Et2NH(CH2)2CO2H][AcO], is prepared in an easy process and fully characterized by using suitable methods such as FT-IR, 1H-NMR, 13C-NMR, and TG, DTG and DTA analyses. After preparation, the promoting ability of this catalyst for one-pot multicomponent synthesis of 2-amino-4H-chromenes, dihydropyrano[3,2-c]chromenes and dihydropyrano[2,3-c]pyrazoles using in situ-developed arylidenemalononitriles through Knoevenagel reaction under solvent-free conditions is described. The sustainable procedure, short reaction times (6–36 min), effortless work-up, non-chromatographic purification, good-to-excellent product yields (79–96%), ease of recovery and reusability of the catalyst up to six reaction runs without a decrease of activity are the notable features of the present protocol.

Temperature sensor based on composite film of vanadium complex (VO 2 (3-fl)) and CNT

Abstract: A vanadium complex (VO2(3-fl)) and CNT composite film based temperature sensor is reported in this study. Surface-type silver electrodes were deposited on the glass substrates. A thin film of VO2(3-fl) and CNT composite was coated as a temperature-sensing material on the top of the pre-patterned Ag electrodes. The temperature-sensing principle of the sensor was based on the conductivity change of the coated sensing element upon heating or cooling processes. DC and AC (100 Hz) resistances of the temperature sensor decreased quasilinearly with increasing the temperature in the range of 25–80 °C. The overall resistance of the sensor decreases by 1.8–2.1 and 1.9–2.0 times at DC and AC voltage, respectively. The resistance temperature coefficients of the sensor were in the range of −(0.9–1.3)% and −(1.1–1.3)% at DC and AC voltage, respectively. The properties of the sensor studied in this work, make it beneficial to be used in the instruments for environmental monitoring of temperature.