Deen Dayal Upadhyay Gorakhpur University

About: Deen Dayal Upadhyay Gorakhpur University is a education organization based out in Gorakhpur, Uttar Pradesh, India. It is known for research contribution in the topics: Thermal decomposition & Lymnaea acuminata. The organization has 1032 authors who have published 1591 publications receiving 21734 citations. The organization is also known as: Gorakhpur University.

Nanocobaltite: Preparation, Characterization, and their Catalytic Activity

Abstract: Mixed transition metal oxides (MTMO) nanoparticles of 3rd-series (NiCo2O4, CuCo2O4, and ZnCo2O4) were prepared by a co-precipitation method. These were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The particle size was found to be in the order of 53.0, 43.4, and 21.2 nm, respectively. The thermolysis of ammonium perchlorate (AP), AP-HTPB (hydroxyterminated polybutadiene) composite solid propellants (CSPs), and HTPB was found to be catalyzed with MTMOs and the burning rate of CSPs was also enhanced. TG and ignition delay study demonstrated that the higher temperature decomposition (HTD) of AP is catalyzed enormously by these catalysts and CuCo2O4 is the best candidate.

The vapour action of essential oils and monoterpenoids against pathogenic fungi

Abstract: The vapour action of pure monoterpenoids and volatile oils has been screened for their antifungal activity against four sugarcane pathogenic fungi using inverted petriplate method. Among tested monoterpenoids, menthol caused complete mycelial inhibition againstCurvularia pallescens at 2000 ppm, geraniol againstColletotrichum falcatum at 3000 ppm, linalool againstC. pallescens at 3000 ppm concentrations. Among tested essential oils, seed oil ofDaucus carota showed complete mycelial inhibition ofC. falcatum at 3000 ppm,Sugandh kokila oil againstC. falcatum at 3000 ppm,Curcuma aromatica againstC. falcatum at 3000 ppm andCurcuma zedoaria rhizome oil againstC. falcatum at 2000 ppm concentrations. Other doses of oils and monoterpenoids exhibited lower antifungal activity.

Use of Tanacetum tomentosum and Ta. dolichophyllum essential oils as botanical repellents and insecticidal agents against storage pest Tribolium castaneum (Coleoptera: Tenebrionidae)

Abstract: In this study, repellent and fumigant activities of Tanacetum tomentosum and Ta. dolichophyllum essential oils were investigated against Tribolium castaneum. Results showed that both oils had effective fumigant and repellent activities. Tanacetum tomentosum oil emerged as more potent than Ta. dolichophyllum oil with LC50 values of 6.85 and 4.32 μL/0.25 L air after 24 and 48 h of exposure, respectively. Ta. tomentosum oil also showed more repellent activity than Ta. dolichophyllum oil by exhibiting repellent activity in the range of 38.70–82.35%. Chemical analysis of both oils revealed that β-bisabolene (50.0%) was the major component of Ta. tomentosum oil and that β-eudesmol (31.4%) and α-bisabolol (10.7%) were the major components of Ta. dolichophyllum oil. Doses of 40 and 80 μL/0.5 L air of both oils significantly protected 500 g of wheat grains for up to 6 months from insect infestation, without causing any side effects in the germination rates; the order of germination rates was Ta. tomentosum (89.45%) > Ta. dolichophyllum (86.78%). Thus, this study suggests that essential oils from Ta. tomentosum and Ta. dolichophyllum can be used as potential alternative botanical fumigants for controlling Tr. castaneum.

A self-similar flow behind a shock wave in a gravitating or non-gravitating gas with heat conduction and radiation heat-flux

Abstract: The propagation of a spherical shock wave in an ideal gas with heat conduction and radiation heat-flux, and with or without self-gravitational effects, is investigated. The initial density of the gas is assumed to obey a power law. The heat conduction is expressed in terms of Fourier’s law and the radiation is considered to be of the diffusion type for an optically thick grey gas model. The thermal conductivity and the absorption coefficient are assumed to vary with temperature and density, and the total energy of the wave to vary with time. Similarity solutions are obtained and the effects of variation of the heat transfer parameters, the variation of initial density and the presence of self-gravitational field are investigated.