in this article our objective is to obtain steady state characteristics of shunt, series, and separately excited dc motors coupled with a centrifugal water pump supplied through a step-up, step-down, and cuk converter from photovoltaic generator. we assume that there are no storage batteries and, of course, the system must operate on maximum utilization i.e. maximum water must be pumped. it is ...

Soybean meal (SBM) was treated with acid or alkali to determine effects on N solubility, in vitro NH3-N accumulation, in situ N degradability, and N digestion and retention in growing lambs. The following SBM treatments resulted in decreased (P less than .05) N solubility and in vitro NH3-N accumulation compared with control SBM: spraying with 2.5 or 5% acetic or propionic acid, soaking in .5 N...

The effects of temperature, light, food availability, depth, and season on growth and chlorophyll a (chl a) concentration in the temperate scleractinian coral Oculina arbuscula were experimentally examined in the laboratory and field. The coral has a wide temperature tolerance, but growth was significantly greater at summer than at winter temperatures. Light and a zooplankton food source both c...

Kentler 20. yüzyılın son çeyreğinde iş, eğitim, ticaret ve eğlence gibi nedenlere bağlı olarak insanların ilgi odağı olmuşlardır. Bu yüzden kentlere nüfus akını olmuş kentler kalabalık mekanlar haline gelmişlerdir. Dolayısıyla kalabalıklaşan kentlerin yönetiminde hizmetlerinin sunumunda birtakım yeni metotlar oluşturma böylece hem hizmetlerin kolaylıklar elde edilmesi de kent kaynaklarının kull...

human activities in the recent years have considerably increased the rate of water pollution in many regions of the world. in this case study, the main sources of wastewater discharging into the gargar river were identified. using river and point source flow rates and water quality parameters measured along the river, the river water quality was simulated using a commonly used, one-dimensional ...

Winter wheat (Triticum aestivum L.) grows in dry season but summer maize (Zea mays L.) coincides with rainfall in the North China Plain (NCP). Increasing rainfall use efficiency and harmonizing its utilization between the two species is an effective way to mitigate impact on groundwater deriving from wheat irrigation. One to four times water supply (W1, to W4) were employed in wheat, three wate...

In an attempt to find new solutions to problems resulting from top-down approaches to resource conservation and sustainability, community-based co-management over an entire wetland ecosystem (comprising beels, seasonal wetlands, rivers and streams), not just a single water body, recognizes that local communities should have direct control over the management, utilization and benefits of local r...

natural resources are valuable capitals for all nations. rangelands as the most extensive natural ecosystems in iran provide numerous services, including fodder production and red meat supply, soil conservation and water regulation. although uncontrolled exploitation of these resources has imposed much pressure and caused many losses within the ecosystems. impacts of overutilization of nomadic ...

sugar beet is one of the major products in qazvin plain that allocated most of planting areas to itself after wheat, barley and corn. in recent years, restriction on water resources decreased sugar beet planting area in this plain. therefore, in this study, the effects of increase in sugar beet planting area on planting pattern, grower's gross profit, and inputs utilization under water sho...

Synthetic cannabinoid receptor agonists are becoming increasingly popular in adolescent age group as an abused substance. Therefore, pediatric emergency physicians should be prepared for Bonzai utilizations which are being more common day by day. The aim of the study is to investigate cases who admitted to a pediatric emergency service with use of Bonzai.