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Abstract : Synthesis and Characterization of Low-Cost Epoxy-Based Erosion Resistant Nanocomposite Coating
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Abstract: We report a simple route to synthesized erosion resistant epoxy-based nanocomposite coatings. The silica nanoparticles were surfaced modified using stearic acid and then incorporated into the epoxy coating. The resulting nanocomposite coating films were characterized for erosion resistance, mechanical and thermal stability. For the application on turbine blades, conventional techniques were used. It was found that for the incorporation of nano silica into the epoxy matrix, surface modification was essential. Besides, incorporation of silica resulted in considerable improvement in the resistance to erosive wear and a life span improvement of around 36 percent was achieved. Similar trend was observed for the Shore D hardness which increases from 60 for the virgin coating to 70 for the nanocomposite coating. Keywords: Polymeric nanocomposite, epoxy coatings, silica nanoparticles, erosion resistance.Download Full Article |
Abstract : Associations of Intellectual Ability with Emotional Intelligence, Academic Achievement and Aggression of Adolescents
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Abstract: Purpose: The current study examined the relationship of intellectual ability with emotional intelligence, academic achievement, and aggression of adolescents. Methods: Correlational design was utilized to study the relationship between these variables. Adolescent students (N=500, 50% boys & 50% girls, with the mean age of 15.01 years & SD of 1.11) were approached from different private schools and colleges of Karachi. To measure their intellectual ability, emotional intelligence, and aggression, Draw-A-Person Intellectual Ability Test for children, adolescents, and adults (DAP: IQ), Wong and Law Emotional Intelligence Scale (WLEIS), and Aggression Questionnaire-Short Form (AQ-12) were administered. Their academic achievement was assessed through their percentage of most recent examination. Pearson product moment correlation coefficient was utilized to analyse the results. Results: Intellectual ability was significantly positively related with emotional intelligence and its domains i.e. Self-Emotional Appraisal, Others’ Emotional Appraisal, Use of Emotions, and Regulation of Emotions (p <.01). Intellectual ability and emotional intelligence were also significantly positively related to academic achievement (r=.181, p < .01 & r = .143, p < .01 respectively). Further, intellectual ability and emotional intelligence were significantly negatively related with aggression (r = -.108, p < .01 & r = -.102, p < .05 respectively). Conclusion: Intellectual ability and Emotional intelligence are related constructs which are not only positively related with each other but also with academic achievement while negatively related to the aggression of adolescents. Hence, these two domains of intelligence are equally important in academic achievement as well as in control/expression of aggression. Keywords: Adolescent students, emotional appraisal, emotion regulation, verbal aggression, physical aggression, anger, hostility, PakistanDownload Full Article |
Abstract : Effect of Green Manure, Sesbania bispinosa Wight Amendment on Incidence of Sucking Insect Pests, their Predators and Yield in Organic Cotton
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Abstract: Cotton holds the key importance in the economy of Pakistan, but its yield is severely affected due to the infestation of many insect pests. Farmers mostly rely on chemicals to control pests but their adverse effects on human health and their interests are also considerable. Therefore, this study was conducted over two years to evaluate the influence of amendment of soil with green manure (GM) Dhancha, Sesbania bispinosaWight on the population of cotton sucking insect pests and their predators. Significant impact of GM was found in lowering the population of sucking pests of cotton i.e., Thrips tabaci(Lind), Bemisia tabaci (Gennadus), Amrasca bigutulla bigutulla (Ishida) and Tetranychus urticae (Koch) during both years. Population of predators i.e., Chrysoperla carnea, Geocoris punctipesand Orius sp. was also higher in dhancha treated plots in comparison to control. Application of neem oil was found effective in lowering the population of sucking insect pests during 2014; whereas, application of C. carnea cards showed significant impact after the mid cotton season during 2015. Overall growth and yield parameters were better in dhancha amended organic cotton treatment in comparison to control. Keywords: Cotton, dhancha, green manure, pests, predators, yield.Download Full Article |
Abstract : Prevalence and Risk Factors Associated with Sub-Clinical Mastitis in Kundhi Buffaloes
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Abstract: The present study aimed to elucidate the magnitude and distribution of subclinical mastitis and associated risk factors in ‘Kundhi’ buffaloes of Hyderabad, Tandojam and Tando Allahyar locations of the province of Sindh, Pakistan. Milk samples (n=840) collected from 210 buffaloes were evaluated for the presence of subclinical mastitis in buffaloes using California Mastitis Test (CMT) and severity; moderate, severe, more severe, most severe. The positive samples were further processed for isolation and identification of bacterial pathogens. The overall intensity of subclinical mastitis at animal level was recorded as 54.29% while significantly higher prevalence (P<0.05) of subclinical mastitis was observed in buffaloes of Tandojam (60.56±0.996%) location. The prevalence of the subclinical at quarter-wise noted as 39.29% given maximum frequency (11.31±0.085%) with hind left quarters. The age and parity were found potential risk factors in Kundhi buffaloes, and susceptibility to subclinical mastitis was higher beyond the age of 6-9 years and 4-7 calving. The higher prevalence as well as the intensity of the disease was determined in buffaloes located at Tandojam than Hyderabad and Tando Allahyar. The ailment was higher in animals at 4th lactation likewise crossing 6 years of age and 4-7 parity. The old age animals were more prone to subclinical mastitis than the younger animals. Overall, the prevalence of the subclinical mastitis at animal and quarter levels was observed in buffaloes. Keywords: Kundhi buffalo, sub-clinical, mastitis, prevalence, risk factors.Download Full Article |
