Floristic study on the algae of Siahdarvishan River in Guilan Province, north Iran

In the present study the freshwater algae of Siahdarvishan River were sampled on a montly basis from December 2007 through November 2008. Three sampling stations (Gaght roudkhan , Shahkezr dame and Talab laleh ) were chosen in the river. Some physical and chemical parameters (water temperature , total hardness , nitrate , nitrite, phosphate and pH) of water samples were measured. A total of 84 species were identified including: Chlorophyta, 36 species; Cyanophyta, 24 species; Bacillariophyta, 20 species; Rhodophyta, 2 species; Euglenophyta and Xanthophyta each with 1 species. Among the families, Oscillatoriaceae with 14 species showed the highest species richness. Taxonomic keys to genera and species are presented to facilitate the identification of algal flora of the region

Solar water distillation by using water in the inner glass evacuated tubes

Paper presented to the 3rd Southern African Solar Energy Conference, South Africa, 11-13 May, 2015.Evacuated tubes are made from two layers of glasses. The inside glass is coated and the space between the glasses is evacuated. When sun radiations pass through the first layer and transfer heat to the inner side, since the space between them is evacuated it cannot cool down with convection or conduction. The common way of using an evacuated tube is to put an evacuated copper rod inside it to heat up and make contact with a water container to let the water boil. In the current study water is directly inside the inner evacuated tubes. Thus, the evaporation happens in these tubes and there is no need to use a water container or copper rods. Results show that when the amount of water is increased in the tubes the production raises significantly. Result for two values of volume of water in two days with acceptable similar solar radiation and ambient temperature are reported.dc201