Herein we describe an effective route for the degradation of methyl green (MG) dye under visible light illumination by pristine and strontium (Sr)-doped zinc oxide (ZnO) photocatalysts (synthesized by the simple chemical precipitation method). The x-ray diffraction structural analysis has confirmed that both photocatalysts exhibit the hexagonal wurtzite structure; without any additional phase formation in Sr-doped ZnO, in particular. The optical properties of the synthesized photocatalysts have been investigated using UV–vis absorption spectroscopy in the wavelength range of 250–800 nm. Through Tauc’s plot, the slight decrease from 3.3 to 3.2 eV in band gap energy has been elucidated (in the case of Sr-doped ZnO), which has been further confirmed by the quenching in the intensity of Photoluminescence (PL) emission spectrum. This may be due to sub-band level formation between valence and conduction band, caused by the impregnation of Sr2+ ions into ZnO host. The morphological study has also been performed using Field Emission Scanning Electron Microscope, which indicates nanoparticles (NPs) based surface texture for both photocatalysts. During the photocatalytic activity study, after 30 min irradiation of visible light, ∼65.7% and ∼84.8% photocatalytic degradation of MG dye has been achieved for pristine and Sr-doped (2 wt%) ZnO photocatalysts, respectively. The rate of photocatalytic reaction (K) has been observed to be ∼0.06399 min−1 for Sr-doped (2 wt%), whereas nearly half magnitude ∼0.03403 min−1 has been observed for pristine ZnO, respectively. The significantly improved photodegradation activity may be ascribed to the relatively broader optical absorption capability, surface defects and the enhanced charge separation efficiency of the Sr-doped ZnO photocatalyst.

Objective This study explores the perceptions of final year medical students and clinical faculty with regard to role modelling in teaching professionalism. Methods In this qualitative research design, we used the Constructivist Grounded Theory model. Six semi-structured interviews with faculty from six clinical specialties and three focus group discussions with 22 final year students were conducted. We applied initial, focused and selective coding along with a thematic analysis of the subject to develop a core category. This is the first part of a larger study that addresses the impact of positive role modelling on teaching professionalism. Findings relevant to negative role modelling are being reported in a subsequent paper. Results The results showed consensus that positive role modelling is the most important strategy for teaching professionalism to medical students. A disturbing finding was a perceived deteriorating level of inspirational positive role modelling. A lack of institutional support and weak regulatory control were pointed out as potential factors contributing towards this deterioration. Conclusion Positive role modelling was found to be the most effective way to teach professionalism to medical students. However, it cannot be truly effective unless institutions play their role which is pivotal in promoting a culture of professionalism. This can be materialized by recognizing and facilitating conscientious and explicit role modelling by the medical faculty. In addition, an effective regulatory control by the concerned authorities could play an important role.

In this paper, we present a load-balancing strategy (Adaptive Load Balancing strategy) for data parallel applications to balance the work load effectively on a distributed system. We study its impact on computation-hungry matrix multiplication application. The ALB strategy enhances the performance with features such as intelligent node selection, pre-task assignment, adaptive task sizing and buffer allocation, and load balancing. The ALB strategy exhibits reduced nodes idle time and inter process communication time, and improved speed up as compared to Run Time task Scheduling strategy.