Feasibility study of Tehran province water resources for fish production – Phase 1: Salehabad Qanat

This feasibility study carried out in response to request of Tehran Province Fisheries Management, in order to Qanat Salehabad water assessment for aquaculture relataed purposes in Tehran Municipality – Regions 19 & 20. During 6 monthes between May – October 2011 in 3 sampling stations by 3 replicates investigations executed. Physic-chemical, Heavy methals, organochloro-organophosphore pesticides and microbial nominated parameters analysed in reference to Iran national and international standards as well, resulted an overall assessment on quality and quantity of Qanat water for aquaculture purposes. Results expressed station 1 in all studied seasons can be develop for fisheries warmwater applications and in cold seasons (September-March) fisheries coldwater relevant activities can be consider. Stations No 2 & 3 known as infeasible for fisheries applications but would be recommend for agriculture rrigation. According to the results, possibility of developing live fish shopping centers (Cold – warmwatetr fishes) between station 1 and before crossing the Qanat flow and Behesht-e-Zahra freeway is considerable, indeed water rights could be negotiate between Tehran Municipality and Tehran province Fisheries Bureo. Also application of feasible anti microbial filters and other minimum limitation parameters control is necessary before leading Qanat water flow into proposed live fish shop. And suitable septic tank is recommended at the outlet of proposed fisheries units. Monitoring of nominated physic-chemical & microbial parameters during operation of fisheries unites highly recommended

Application of SnO2 Nano-powder on MEMS Type Gas Sensors

This paper describes a cost effective and new method for preparing SnO2 sol-gel as the basic material for the Micro-Electro-Mechanical System (MEMS) type gas sensors. The SnO2 sol-gel was prepared by mixing SnCl4, propanol and isopropanol in a specified ratio. The produced sol-gel was exposed to two different decomposition temperatures of 600°C and 1200°C. Thermal treatment of the sol-gel resulted in formation of nano-crystalline single phase SnO2 powder having two different grain sizes. The grain size of the nano-powder calcinated at 600°C was about 10 nm and increased to about 80nm when the treatment temperature increased to 1200°C. The samples analyzed by XRD and TEM methods and both confirmed the grain size dependency on temperature. The prepared SnO2 sol-gels were applied on alumina substrates and the prepared samples were tested for sensitivity and selectivity using hydrogen, air and natural gas. The measurement results indicate a decrease in both selectivity and sensitivity of the gas sensor for increased nano-powder grain size