Photoelectrochemical properties of mesoporous NiOx deposited on technical FTO via nanopowder sintering in conventional and plasma atmospheres

Nanoporous nickel oxide (NiO x ) has been deposited with two different procedures of sintering (CS and RDS). Both samples display solid state oxidation at about 3.1 V vs Li+/Li. Upon sensitization of CS/RDS NiO x with erythrosine b (ERY), nickel oxide oxidation occurs at the same potential. Impedance spectroscopy revealed a higher charge transfer resistance for ERY-sensitized RDS NiO x with respect to sensitized CS NiO x . This was due to the chemisorption of a larger amount of ERY on RDS with respect to CS NiO x . Upon illumination the photoinduced charge transfer between ERY layer and NiO x could be observed only with oxidized CS. Photoelectrochemical effects of sensitized RDS NiO x were evidenced upon oxide reduction. With the addition of iodine RDS NiOx electrodes could give the reduction iodine → iodide in addition to the reduction of RDS NiO x . p-type dye sensitized solar cells were assembled with RDS NiO x photocathodes sensitized either by ERY or Fast Green. Resulting overall efficiencies ranged between 0.02 and 0.04 % upon irradiation with solar spectrum simulator (Iin : 0.1 W cm −2 )

Ganglioneuroblastoma of the posterior mediastinum: a case report.

Introduction:Ganglioneuroblastoma is a rare peripheral neuroblastic tumor that is derived from developing neuronal cells of the sympathetic nervous system, and is found mostly, but not exclusively, in babies and young children. Case Presentation: To the best of our knowledge, there have been no previously reported cases of ganglioneuroblastoma of the mediastinum from Pakistan. We present a case of ganglioneuroblastoma in an eight-year-old Pakistani Sindhi boy incidentally found to have a large posterior mediastinal mass that on biopsy initially looked like ganglioneuroma. He underwent successful excision of the mediastinal mass and remained stable post-operatively. Final pathology findings showed a ganglioneuroblastoma. He has remained free of symptoms on long-term follow-up. Conclusions: The rarity of this tumor along with its almost exclusive occurrence in the pediatric population necessitates a thorough investigation of Patients presenting with a symptomatic mass

Isolation and characterization of arsenite oxidizing Pseudomonas lubricans and its potential use in bioremediation of wastewater

A bacterium, Pseudomonas lubricans, isolated from heavy metal laden industrial wastewater, has been shown to tolerate multiple heavy metals suggesting its importance in bioremediation of industrial effluents. P. lubricans tolerated As(III) up to 3 mg ml-1, Cu2+ up to 0.7 mg ml-1, Hg2+ up to 0.4 mg ml-1, Ni2+ up to 0.4 mg ml-1 and Cr6+ up to 0.5 mg ml-1. P. lubricans showed optimum growth at pH 7 while optimum temperature for growth was 30°C. P. lubricans could oxidize As(III) 42% (42 μg mg-1 of protein), 78% (78 μg mg-1 of protein) and 95% (95 μg mg-1 of protein) from the medium after 24, 48 and 72 h of incubation at optimal conditions, respectively. The arsenite oxidizing ability shown by P. lubricans indicates its potential application in biological treatment of wastewaters contaminated with arsenic

Leadership in Online Education: A Scoping Review

Over the last two decades, we have witnessed a growing interest in online learning. There is an increased focus on online education research due to the COVID-19 pandemic, as the crisis led to online education platforms becoming a necessity for educationists and students. This article reviews online education, purely, in the context of leadership. Past reviews have focused on concepts surrounding online learning such as technology, pedagogy, and student satisfaction. However, limited attention has been drawn to leadership exclusively in relevance to online education. The scoping review analyses 63 articles published between 2002-2022 to answer two research questions. First, what are the research concepts, theories, models, and frameworks operationalized in the publications within this topic domain? Second, who are the stakeholders and leaders identified in literature? Through synthesizing alternative research perspectives in the field of leadership, education, and information and communication technology (ICT), this review identifies four categories of research literature relevant to the topic domain. Following themes emerged from the analysis of the publications: impact of leadership on online education; student experience in an online leadership programme; impact of online education on leadership development of actors in an online education setting; and perception of leadership in an online education setting. Based on the review, an agenda is proposed for future research to enhance our understanding of the role of leadership in online education and elucidate the relationship between leaders and online learning in educational institutions. A lack of focus on the key leaders in the existing literature is made apparent, and further empirical research is recommended. This review makes a theoretical contribution by consolidating existing research in leadership in online education through the synthesis categories and identifying future research pathways. The findings have practical implications for leadership in online education in educational organizations through identification of stakeholders and the entities in leadership positions

Unsteady three dimensional flow of couple stress fluid over a stretching surface with chemical reaction

The unsteady three-dimensional flow of couple stress fluid over a stretched surface is investigated. Analysis has been performed in the presence of mass transfer and chemical reaction. Nonlinear flow analysis is computed by a homotopic approach. Plots are presented and analyzed for the various parameters of interest. A comparative study with existing solutions in a limiting sense is made