In recent years, photovoltaic energy has become a popular alternative to traditional fossil fuels due its renewable and sustainable nature, the incentives provided by countries encourage research development in this field have accelerated implementation of roofs. One important factor maximizing efficiency solar panels is their orientation harness maximum irradiation with minimum roof area. arti...

Aim: This study aimed to carry out performance analysis of a 780 Wp PV power backup system installed at learning institution in Western.
 Study design: To achieve this goal, site solar radiation received, ambient temperatures, dc current and voltages were measured order evaluation the system.
 Place Duration Study: Department electronics electrical, Kaiboi Technical Training Institute...

There are a wide range of catchment management models in Australia, that vary according to the resources and historical framework of the particular catchment and jurisdiction. The Natural Resources Commission (NRC) has reviewed the progress of catchment management in New South Wales over the past six years and has observed the development of significant co-operative relationships, particularly ...

Water is a basic demand of sustainable development in most regions of the world. The non-uniform temporal and spatial distribution of water resources will lead to water shortage in arid and semi-arid areas. Pishin catchment is one of the most important catchments in South-East Iran. The basin had been faced with consecutive droughts in recent years. On the other hand, water resources developmen...

Catchment-scale chemical transport is jointly controlled by hydrological and chemical processes. Water may take a complex set of flowpaths underground toward the stream, carrying soluble substances with it. Some chemical constituents are nonreactive; these act as passive tracers, moving with the water. Other constituents react with the porous medium; concentrations of these reactive tracers rev...

Water harvesting is the collection of runoff for productivity purposes, instead of runoff being left to cause erosion. In arid and semi-arid drought-prone areas, micro-catchments are widely used as a water harvesting method to improve rangeland condition. The aim of present study was to investigate the effects of micro-catchment on ecological indices of rangeland health in Ghick-Sheikhha, Jirof...

The fate and transport of methylmercury (MeHg) were studied in a small boreal catchment. Hydrological processes largely govern the magnitude of the flux of MeHg. Seasonal and inter-annual variability in hydrology produce variable source strengths of MeHg throughout the catchment. The mass flux of MeHg within, and from the catchment is dependent on the mass flux of water and the relative placeme...

This paper presents a comprehensive refinement of system modeling and optimization study of air-cooled direct expansion (DX) refrigeration systems for commercial buildings to address the energy saving problem. An actual DX rooftop package of a commercial building in the hot and dry climate condition is used for experimentation and data collection. Both inputs and outputs are known and measured ...

STUDY OBJECTIVE To study whether hospitals of different levels are equally safe places to give birth in a regionalised system of care. DESIGN This was a population based, cross sectional survey comparing birth outcomes in nationwide catchment areas of different levels of hospital care. All women and low risk women were examined separately. SETTING AND SUBJECTS The study population comprised...