Background and purpose: Water is the most important limiting factor of sustainable development. Poor quality of water sources and lack of appropriate management in some regions are the main reasons of water crises in the country. This study was conducted to assess water sources quality and the trend of their change in rural area of Sabzevar County in a five year period. Materials and Met...

Legionellosis is an acute respiratory and lung disease caused by bacteria of the genus Legionella. Natural and manmade aquatic environments are the major reservoirs of Legionellae. Transmission to humans occurs through inhalation of infectious aerosols. 104 samples of water intended primarily for the cooling process in flat glass factories were examined. All samples contained varying amounts of...

INTRODUCTION Birds have undoubtedly been colliding with manmade structures ever since humans started building things skyward. The earliest documented instances of collision mortality in this country are from the late 1800's (Coues 1876, Merriam 1885) and the problems continue unabated today. The total avian mortality due to collisions with manmade obstacles is probably greater every year as bui...

Reservoirs are manmade habitats, intermediate between rivers and lakes, presenting distinct hydrological and morphometric characteristics, with differential mean water residence time. They also present proper vertical and horizontal organisations, and their evolution depends on several variables acting on different special and temporal scales. The water quality evolution of the Itaipu Reservoir...

INTRODUCTION Signal transmission underwater is a challenging task. Generally, low frequency acoustic signals are used for transmission underwater as electromagnetic signals are highly attenuated. Any modulated signal transmitted in water, undergoes various losses due to attenuation, reverberation, spreading and internal waves etc apart from ambient noise due to natural and manmade sources. The ...

Mission requirements for planned NASA and DOD spacecraft often include designing for survivability. The threats to the survivability of a spacecraft can be either manmade (e.g., ASATs, space debris) or natural (e.g., radiation belts, micrometeoroids). An overview of the principal kinds of manmade threats and the implications on the design of space power systems are discussed. In general, it is ...

water is the most essential component for sustaining lives of humans and other living creatures. supplying potable water with adequate residual pressure is a fundamental responsibility of city administration, which they do during normal conditions. but sometimes, abnormal conditions are formed resulting pressure deficient conditions during the daily operations of water distribution networks. th...

Attention is thought to impose an informational bottleneck on vision by selecting particular information from visual scenes for enhanced processing. Behavioral evidence suggests, however, that some scene information is extracted even when attention is directed elsewhere. Here, we investigated the neural correlates of this ability by examining how attention affects electrophysiological markers o...

The external phosphorus (P) loading has been halved, but the P content in the water column and the area of anoxic bottoms in Baltic proper has increased during the last 30 years. This can be explained by a temporary internal source of dissolved inorganic phosphorus (DIP) that is turned on when the water above the bottom sediment becomes anoxic. A load-response model, explaining the evolution fr...