Xem 1-4 trên 4 kết quả Analysis of cavitation
  • Low specific speed centrifugal pumps have low flow rates and high heads. They are widely applied in the petroleum, chemical, aerospace, pharmaceuticals, metallurgy, and light industries, among others. With the development of space technology and petrol chemical industry, the highly stable cavitation performance of centrifugal pumps has been put forward. Poor cavitation performance is one of the key problems in low specific speed centrifugal pumps.

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  • An effective separation method of very pure binder fraction to assess radiocarbon dating is proposed in the present contribution. The elimination of contaminant error sources and the suitable selection of mortar samples enable the reliable dating. Petrographic analysis under polarizing light microscopy is used to identify different mineralogical phases of mortar samples, aggregate nature, and the limestone fragment remains.

    pdf0p wqwqwqwqwq 06-07-2012 42 7   Download

  • All the necessary information and data were collected from both medical records of the patients and special questionnaires that were designed by our staff in 1996 for this purpose. Statistical analysis was carried out descriptively by using frequency and percentage. Presence of TB in the patients was confirmed by identifying the microorganism in the tissues detecting pathological changes in favour of TB and/or having past history of pulmonary TB associated with its anatomical complications such as cavitation, bronchiectasis, and bronchial stenosis.

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  • The Institutional Review Board approved this retrospective study, with a waiver of informed consent from the patients. TB outbreaks occurred in 15 senior high schools and chest radiographs from 58 students with identical strains of TB were analyzed by restriction fragment length polymorphism analysis by two independent observers. Lesions of nodule(s), consolidation, or cavitation in the upper lung zones were classified as typical TB.

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