Investigation of ion induced bending mechanism for nanostructures

Ion induced bending is a promising controlled technique for manipulating nanoscale structures. However, the underlying mechanism of the process is not well understood. In this letter, we report a detailed study of the bending mechanism of Si nanowires (NWs) under Ga+ irradiation. The microstructural changes in the NW due to ion beam irradiation are studied and molecular dynamics simulations are used to explore the ion–NW interaction processes. The simulation results are compared with the microstructural studies of the NW. The investigations inform a generic understanding of the bending process in crystalline materials, which we suggest to be feasible as a versatile manipulation and integration technique in nanotechnology

Effect of supply air temperature on conservation of energy in air conditioning of space

In HVAC applications, huge amount of energy is utilized in fans and blowers to maintain the flow. In this paper energy savings associated with air distribution is discussed. In a most commonly used air distribution system, uniform thermal environment in the occupied space is established. An alternative to this method is the under floor air distribution system (UFAD) which is in its fantasy state. Thermal stratification can be established in this method due to the buoyancy flow of the air. In this paper assessment of the impact of temperature sensors in energy savings is done in UFAD system. It is observed that by the placement of temperature sensors in the occupied space, supply air temperature can be controlled while maintaining the comfort conditions. By optimal conditions of the temperature and volume flow, energy savings can be achieved due to reduction in energy requirements in refrigeration and ventilation. The comfort criteria of ASHRAE standard 55-92 is taken

Health profile of government aided private school children in urban slum of Solapur, Southern Maharashtra, India

Background: Malnutrition is a silent emergency and its prevalence is high among children under five years of age. The school children in present study belongs to lower middle income families and their parents are working in unorganised sectors like handloom textile mills, construction sites worker, domestic bidi worker. Hence the study was planned to understand their health profile including morbidity pattern and sociodemographic profile and their nutritional status and grade of malnutrition according to World Health Organisation (WHO) growth reference standards.Methods: The present descriptive cross sectional Study was carried out among 767 students from class Lower Kindergarten to 7th standard of government aided private school. A pre-designed and pre-tested questionnaire was used to interview and examine all the participated students. Grading of malnutrition was carried out using WHO reference tables. Chi square test of significance was applied.Results: A total of 767 students participated in this study. Boys were 513 (66%) and girls were 254 (33%).Most common morbidity found to be dental caries 55% .Out of 537 children 339 (63%) were underweight. Out of 767 children 302 (39%) had stunting, 272 (35%) had thinness and 26 (3%) were found to be obese. Two (0.32%) study subjects had suspect cardiac problems.Conclusions: The present study shows pattern of morbidities and malnutrition among school children. Comprehensive periodic health check-up should be carried out for early diagnosis and treatment of the common morbidities. Further studies should be carried out to assess the impact of health education.