Received: 22 December 2004 Accepted: 8 March 2005 Published online: 17 June 2005 Springer-Verlag 2005 Abstract Coastal areas of Hong Kong Island are one of the most extensively urbanized areas in the world. Groundwater samples in natural slopes and developed spaces in the regions centered by the MidLevels area, Hong Kong Island, were collected and analyzed to investigate the natural and anthrop...

This in vitro study evaluated, using a bacterial leakage model, whether intracanal medication with calcium hydroxide [Ca(OH)2]-based pastes prepared with different vehicles, has inhibitory effect on corono-apical leakage of bacteria. Forty instrumented human canines were dressed with Ca(OH)2 p.a. associated with: G1 = distilled water; G2 = polyethylene glycol (PG); G3 = PG + CMCP; and G4 = glyc...

In this research, the system of leakage of pipelines detection will be done by a computerized technique by using analysis of pressure monitoring as a determinant of presence of pipeline leaks in the water distribution network. The pressure data obtained from EPANET software, namely a modeling in a hydraulic system. This study uses two methods, artificial intelligence, namely Support Vector Mach...

wheat, cv. alvand, under late sowing condition and comparison with conventional sowing date was investigated in a field experiment in 2009-2010. the factors were seven levels of priming by sa, including control or untreated seeds, 400, 800, 1200, 1600, 2000 and 2400 µm sa and two sowing dates including conventional sowing date (23 october) and late sowing (22 november). results showed that prim...

When washed yeast cells grown under appropriate conditions were suspended in glucose solution there was a sudden release of alpha-amino nitrogen into the medium. This released material was of low molecular weight, and its composition was closely similar to that of the intracellular free amino acid pool. During the leakage of amino acids, the yeast did not efficiently absorb labeled amino acids ...

saymareh dam and hydro-power plant are under construction on saymareh river in ravandi anticline, ilam province. during boring the power tunnel which crosses the anticline, a large volume of water was encountered. this volume of water was not observed in the past. considering the water quality of springs, water level of dam site piezometers, geological and hydrogeological inspections, isotope a...

The effect of extreme temperature on the quantum yield of fluorescence and membrane leakage of Pinus canariensis growing in 5 stands at different altitudes and orientation in Tenerife (Canary Islands, Spain) was determined. Needles were collected from the field and transferred to the laboratory where they were kept in a closed chamber with water-saturated air overnight. Then they were exposed f...

Modeling Leakage rate in water supply networks is important due to some problems namely: quality of service, the cost of system expansion and wasting energy resources. Monitoring the pressure in certain parts of network and then finding a relation between pressure changes and leakage rate is a quick way for detecting leakage. This relation is nonlinear and complex for modeling and there exist s...

The computer simulation program of a practical scale reverse electrodialysis process has been developed based on the program for saline water electrodialysis. The program is applied to compute the performance of an industrial-scale reverse electrodialysis stack (effective membrane area S = 1 m × 1 m = 1 m2, cell pair number N = 300 pairs). The stack operatingconditions are optimized. Seaw...