the purpose of the present paper is to develop light beam method to measurement of interfacial area in a rectangular gas-liquid bubble column. total interfacial area can be determined in bubble column filled by transparent liquid by light transmission method. according to pervious researches, the fraction of parallel light is function of interfacial area and optical path length that these two p...

zeolite fau type-y is one of the most studied framework of all zeolites, and has been used as catalysts for number of reactions in the refinery and petrochemical industry. in this research, nanocrystalline zeolite y was synthesized by hydrothermal method. the crystal size of zeolite y is influenced by temperature, aging time, alkalinity, and water content. the synthesized zeolite nay is identif...

Killer cell immunoglobulin-like receptors (KIRs) and their HLA ligands interact to regulate natural killer (NK) cell function. KIR gene content and allelic variations are reported to influence human immunodeficiency virus (HIV)-1 infection and pathogenesis. We investigated the impact of KIR genes on heterosexual HIV-1 transmission among 566 discordant couples from Lusaka, Zambia. KIR2DS4*001, t...

In wireless network environments, the effect of transmission errors and losses on the video quality vary, depending on the intensity of the burst, and which parts of the video stream are lost. Among the existing transmission error control techniques, FEC and ARQ represent good solutions for combating transmission errors, but require redundant data. Interleaving can improve subjective video qual...