List of Articles radiation intensity

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  1 - Ozone Concentration and Meteorological Parameters Alternations Investigation in Air Quality Control Company to Aqdasieh Station in 7 Months (from Oct. 2007 to Apr. 2008) in Tehran
  Mansour Ghiasodin Leila Sourati
  In this research measuring ozone concentration in air quality control Company at Aqdasieh station,and meteorological parameters at Resalat station, was compared and investigated. This investigationwas performed for 7 months (from Oct. 2007 to Apr. 2008). The average dai More

  In this research measuring ozone concentration in air quality control Company at Aqdasieh station,and meteorological parameters at Resalat station, was compared and investigated. This investigationwas performed for 7 months (from Oct. 2007 to Apr. 2008). The average daily Ozone concentrationshowed the least quantity of Ozone in early morning and late night air. Comparing the sunshineradiation with variation of Ozone concentration indicated that these two items have direct relations.Increasing the sunshine radiation concludes the increasing of photochemical activity and consequentlyincreasing the Ozone concentration. Investigating the monthly average Ozone concentration showedthat the least registered amount of Ozone was during these 7 months of measurement in Azar(November) and the most registered amount of Ozone occurred in Farvardin (April). The mostimportant factor of main increasing happened in April and in the solar radiation and photochemicalactivities. Manuscript profile
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  2 - Effect of different environmental conditions on optimal cell density, biomass production, lipid and biodiesel production in Desmodesmus microalgae
  Mohammad Niazkhani Ahmad Mohammadi Hamid Mashhadi Fahimeh Mahmoudnia
  10.30495/iper.2022.1946872.1754
  Microalgae are diverse group of simple organisms, which are incorporated in pharmaceutical, cosmic, nutritional and biodiesel productions. The amount of growth in microalgae is affected by physical and chemical conditions of growth environment. In commercial scale in or More

  Microalgae are diverse group of simple organisms, which are incorporated in pharmaceutical, cosmic, nutritional and biodiesel productions. The amount of growth in microalgae is affected by physical and chemical conditions of growth environment. In commercial scale in order to achieve highest amount of biomass or biodiesel, it is necessary to use culture media with proper combination of materials. Therefore, in this study, effects of different values of temperature, light intensity, lighting period, saltiness and pH were tested by their effect on cell concentration, biomass, lipid and biodiesel production in desmodesmus microalgae. As a result, the best temperature for increase in cell concentration of microalgae was 25 degree of Celsius,  light intensity of 4500 lux, light period of 17 hours, saltiness of 5 ppm and pH of 8. The highest amount of biomass was achieved in light intensity of 3000 lux, 18 hours of lighting, saltiness of 5 ppm and pH of 9. The highest amount of lipid was produced at temperature of 26, light intensity of 4200 lux, lighting period of 16 hours, saltiness of 12 and pH of 9. Finally, the highest amount of biodiesel was produced at temperature of 26, light intensity of 4200, lighting period of  16 hours, saltiness of 11 and pH of 9. Manuscript profile