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在全球范围内,许多电信运营商一直以为ADSL技术可以解决IPTV部署问题。但是,由于ADSL技术标准的复杂性,运营商对此并非十拿九稳,因此其应用步伐随之减缓了。 相似文献
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尽管无线和固线运营商对IMS存在标准的争议及根本不同的方法,但支持者相信,这项技术将在今年爆发。经过了几年标准及兼容性的不确定之后,IMS技术已经走到了十字路口。运营商削减成本及拥抱下一代网络的承诺刺激着人们去接受它,但应用的缺乏阻碍了其大规模的部署。不过,许多IMS的支持者坚持认为,IMS将凭借固定和移动运营商在亚洲、欧洲及美国已经展开的部署在今年兴旺起来。 相似文献
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In this paper, the biodegradation process of 4-nitrophenol (4NP) in a sequencing batch reactor has been investigated. Kinetic tests have been carried out on biomass grown on mixed substrate (4NP plus biogenic substrate) both in the presence of a biogenic substrate fraction in the feed and with 4NP as the sole carbon source. Removal kinetics for all tests is well described by the typical substrate inhibition pattern as predicted by the Haldane equation. In both sets, estimated kinetic parameters are very similar: no beneficial effect of the biogenic fraction is observed on the 4NP removal while increasing trend of 4NP maximum removal rate with the 4NP/COD(TOT) ratio in the feed has been observed. This finding has been modelled by estimating the fraction of the total biomass involved in 4NP biodegradation as a function of 4NP concentration in the feed. High removal rates, short acclimation times and good settling characteristics of produced sludge (observed during the whole working period) confirm the suitability of periodic systems in enhancing the bacterial potentialities for biodegradation of xenobiotic compounds. 相似文献
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