ITU TT.120协议是多媒体数据会议系统的国际标准,其核心是在T.122/T.125中定义的多点通信引擎———多点通信服务(MCS)。该标准的实现,尤其是在目前通用平台上的实现是需要着重研究的。在讨论多点通信服务机制、MCS提供者组成以及MCS服...ITU TT.120协议是多媒体数据会议系统的国际标准,其核心是在T.122/T.125中定义的多点通信引擎———多点通信服务(MCS)。该标准的实现,尤其是在目前通用平台上的实现是需要着重研究的。在讨论多点通信服务机制、MCS提供者组成以及MCS服务原语分类的基础上,详细给出了基于COM方式多点通信服务(MCS)的接口定义和实现方法,从而为其在COM平台上的进一步开发建立了基础。展开更多
The content and the caking index of the heavy,the dense medium and the loose medium components of coal,obtained by extraction and stripping with CS_2/N-methyl-2-pyrrolidinone mixed solvent(1:1 by volume),were studied ...The content and the caking index of the heavy,the dense medium and the loose medium components of coal,obtained by extraction and stripping with CS_2/N-methyl-2-pyrrolidinone mixed solvent(1:1 by volume),were studied and correlated with the caking property of raw coals.Images of the three group components after heat treatment were analyzed.The results show that both caking index(G) and maximum thickness of plastic layer(Y) of coals have a good linear relationship with the content of the medium component;the dense medium and the loose medium components are the two key factors to determine the caking property of raw coals-they are the source materials of fluidity and swelling of coal,respectively;the heavy component without the swelling and fluidity was cohered by the other components;two new indexes,which can extend current understanding of the caking properties,were introduced.展开更多
[ Objective] To explore the effect of expansion temperature on the release of seven kinds of Hoffmann components （CO, NNK, NH3, HCN,, BaP, crotonaldehyde and phenol） from the mainstream smoke of cigarette. [ Method]...[ Objective] To explore the effect of expansion temperature on the release of seven kinds of Hoffmann components （CO, NNK, NH3, HCN,, BaP, crotonaldehyde and phenol） from the mainstream smoke of cigarette. [ Method] The release amount of seven kinds of Hoffmann com-ponents from the mainstream smoke of cigarettes which were prepared from the cut tobacco treated under different expansion temperatures was de-termined. [ Result] Under the same expansion model, the temperature change produced certain impact on the release amount of NH~, phenol and BAP, while had no significant influence on that of CO, NNK, HCN and crotonaldehyde; under CO2 expansion model, the release amount of seven Hoffmann components was small; the reduction of expansion temperature was good for lowering the harmful index of cigarette to a certain extent. [ Conclusion] The study provides basis for optimizing the technical parameters of producinq less harmful cigarette.展开更多
基金the National Basic Research Program of China (No.2012CB214900)the National Natural Science Foundation of China (No.51274201)+1 种基金the Coal Joint Fund from National Natural Science Foundation of China and Shenhua Group Corporation Limited (No.U1361116)the Priority Academic Program Development of Jiangsu Province Higher Education Institutions
文摘The content and the caking index of the heavy,the dense medium and the loose medium components of coal,obtained by extraction and stripping with CS_2/N-methyl-2-pyrrolidinone mixed solvent(1:1 by volume),were studied and correlated with the caking property of raw coals.Images of the three group components after heat treatment were analyzed.The results show that both caking index(G) and maximum thickness of plastic layer(Y) of coals have a good linear relationship with the content of the medium component;the dense medium and the loose medium components are the two key factors to determine the caking property of raw coals-they are the source materials of fluidity and swelling of coal,respectively;the heavy component without the swelling and fluidity was cohered by the other components;two new indexes,which can extend current understanding of the caking properties,were introduced.
文摘[ Objective] To explore the effect of expansion temperature on the release of seven kinds of Hoffmann components （CO, NNK, NH3, HCN,, BaP, crotonaldehyde and phenol） from the mainstream smoke of cigarette. [ Method] The release amount of seven kinds of Hoffmann com-ponents from the mainstream smoke of cigarettes which were prepared from the cut tobacco treated under different expansion temperatures was de-termined. [ Result] Under the same expansion model, the temperature change produced certain impact on the release amount of NH~, phenol and BAP, while had no significant influence on that of CO, NNK, HCN and crotonaldehyde; under CO2 expansion model, the release amount of seven Hoffmann components was small; the reduction of expansion temperature was good for lowering the harmful index of cigarette to a certain extent. [ Conclusion] The study provides basis for optimizing the technical parameters of producinq less harmful cigarette.
