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.

Investigations of optical and thermoelectric response of direct band gap Ca 3 XO (X = Si, Ge) anti-perovskites stabilized in cubic and orthorhombic phases

Abstract: We predict the phase dependent electronic properties for elaborating the optical and thermoelectric behaviors of both cubic (Pm-3m) and orthorhombic (Pbnm) Ca3XO (X = Si, Ge) antiperovskites using first-principles density functional theory (DFT) computations. The mBJ functional is employed for computing the most accurate electronic characteristics. A direct band gap semiconducting nature has been found appearing due to hybridization between O and Si/Ge p-states. The calculated band gaps lying in the infrared energy region suggest that the studied anti-perovskites can absorb visible and ultraviolet energy revealing potential optoelectronics device applications. Moreover, the important thermoelectric parameters are computed for illustrating the potential thermoelectric applications. Hence, the studied anti-perovskites can simultaneously exhibit various flexible material properties, which reveal their worth for the devices demonstrating versatile characteristics.

The perspectives of the urban poor in climate vulnerability assessments : The case of Kota, India

Abstract: Kota with a high proportion of slum dwellers and extremely high temperatures is under great demand to assess the vulnerability and adaptive capacity of different groups of its inhabitants to the impacts of climatic variability and change. Participatory workshops with key stakeholders in urban administration undertook a short vulnerability assessment to gauge current climate adaptation awareness and measures and discuss and decide on a numbered of proposed actions. The city has many policies and disaster management plans in place although implementation and enforcement was often found lacking. The actions were mainly about infrastructure and ecosystems with few related to boosting and transforming agent capabilities and institutions. The action plans outlining the frequency and responsible institutions for tree planting and cleaning streams also lacked detail or identification of lead institutions, departments, or people. Although stakeholders highlighted that local knowledge was not sufficiently used to inform good planning and policies, the action plans did not include community representatives in decision-making rather only in the implementation of the proposed actions. Although when the group identified slum populations as especially vulnerable the focus of the assessment shifted but in action plans representatives of this group were not included in any decision making or planning processes.

Synthesis, characterization and optical properties of polymer-based ZnS nanocomposites

Abstract: Nanostructured polymer-semiconductor hybrid materials such as ZnS-poly(vinyl alcohol) (ZnS-PVA), ZnS-starch and ZnS-hydroxypropylmethyl cellulose (Zns-HPMC) are synthesized by a facile aqueous route. The obtained nanocomposites are characterized using various techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), UV/vis spectroscopy and photoluminescence (PL). XRD studies confirm the zinc blende phase of the nanocomposites and indicate the high purity of the samples. SEM studies indicate small nanoparticles clinging to the surface of a bigger particle. The Energy Dispersive Analysis by X-rays (EDAX) spectrum reveals that the elemental composition of the nanocomposites consists primarily of Zn:S. FTIR studies indicate that the polymer matrix is closely associated with ZnS nanoparticles. The large number of hydroxyl groups in the polymer matrix facilitates the complexation of metal ions. The absorption spectra of the specimens show a blue shift in the absorption edge. The spectrum reveals an absorption edge at 320, 310 and 325 nm, respectively. PL of nanocomposites shows broad peaks in the violet-blue region (420-450 nm). The emission intensity changes with the nature of capping agent. The PL intensity of ZnS-HPMC nanocomposites is found to be highest among the studied nanocomposites. The results clearly indicate that hydroxyl-functionalized HPMC is much more effective at nucleating and stabilizing colloidal ZnS nanoparticles in aqueous suspensions compared with PVA and starch.