A new glycoside, cervicoside, was isolated from the soft coral Sinularia cervicornis Tix Dur ., collected from the bay of Sanya, Hainan Island. Its chemical structure was determined by spectroscopic methods as hexadec...A new glycoside, cervicoside, was isolated from the soft coral Sinularia cervicornis Tix Dur ., collected from the bay of Sanya, Hainan Island. Its chemical structure was determined by spectroscopic methods as hexadecanyl 1 O β D arabinopyranosyloxy (1→4) [ β D arabinopyranosyloxy(1→4)] β D arabinopyranoside. Cervicoside(1) exhibited cytotoxicity against human SKMG 4, Hep G2 and CNE2 cell in vitro.展开更多
Joining experiments of CBN grains to AISI 1045 steel were conducted using Ag-Cu-Ti composite fillers containing TiX （X=B2 or N） particles at 920 ℃ for 5 min. The influences of TiB2 and TiN particles on the interfac...Joining experiments of CBN grains to AISI 1045 steel were conducted using Ag-Cu-Ti composite fillers containing TiX （X=B2 or N） particles at 920 ℃ for 5 min. The influences of TiB2 and TiN particles on the interfacial microstructure features between CBN and filler were investigated comparatively. The experimental results show that TiN particles are more effective than TiB2 ones to control the interfacial reaction and particularly the resultants. Thermodynamic analysis reveals that the varied interfacial reaction induced by the addition of TiB2 and TiN particles is mainly atttributed to the activity change of the B and Ti elements in the brazing reaction system.展开更多
Fixed carrier membrane exhibits attractive CO2 permeance and selectivity due to its transport mecha-nism of reaction selectivity (facilitated transport). However, its performance needs improvement to meet cost targets...Fixed carrier membrane exhibits attractive CO2 permeance and selectivity due to its transport mecha-nism of reaction selectivity (facilitated transport). However, its performance needs improvement to meet cost targets for CO2 capture. This study attempts to develop membranes with multiple permselective mechanisms in order to enhance CO2 separation performance of fixed carrier membrane. In this study, a novel membrane with multiple permselective mechanisms of solubility selectivity and reaction selectivity was developed by incorporating CO2-selective adsorptive silica nanoparticles in situ into the tertiary amine containing polyamide membrane formed by interfacial polymerization (IP). Various techniques were employed to characterize the polyamide and polyam-ide-silica composite membranes. The TGA result shows that nanocomposite membranes exhibit superior thermal stability than pure polyamide membranes. In addition, gas permeation experiments show that both nanocomposite membranes have larger CO2 permeance than pure polyamide membranes. The enhanced CO2/N2 separation per-formance for nanocomposite membranes is mainly due to the thin film thickness, and multiple permselective mechanisms of solubility selectivity and reaction selectivity.展开更多
文摘A new glycoside, cervicoside, was isolated from the soft coral Sinularia cervicornis Tix Dur ., collected from the bay of Sanya, Hainan Island. Its chemical structure was determined by spectroscopic methods as hexadecanyl 1 O β D arabinopyranosyloxy (1→4) [ β D arabinopyranosyloxy(1→4)] β D arabinopyranoside. Cervicoside(1) exhibited cytotoxicity against human SKMG 4, Hep G2 and CNE2 cell in vitro.
基金Funded by the National Fundamental Research Program of China (No.2009CB724403)Program for New Century Excellent Talents in University from Ministry of Education of China (No. NCET-07-0435)
文摘Joining experiments of CBN grains to AISI 1045 steel were conducted using Ag-Cu-Ti composite fillers containing TiX （X=B2 or N） particles at 920 ℃ for 5 min. The influences of TiB2 and TiN particles on the interfacial microstructure features between CBN and filler were investigated comparatively. The experimental results show that TiN particles are more effective than TiB2 ones to control the interfacial reaction and particularly the resultants. Thermodynamic analysis reveals that the varied interfacial reaction induced by the addition of TiB2 and TiN particles is mainly atttributed to the activity change of the B and Ti elements in the brazing reaction system.
基金Supported by the National Natural Science Foundation of China （20836006）, the National Basic Research Program （2009CB623405）, the Science ＆ Technology Pillar Program of Tianjin （10ZCKFSH01700）, the Programme of Introducing Talents of Discipline to Universities （B06006）, and the Cheung Kong Scholar Program for Innovative Teams of the Ministry of Education （IRT0641）.
文摘Fixed carrier membrane exhibits attractive CO2 permeance and selectivity due to its transport mecha-nism of reaction selectivity (facilitated transport). However, its performance needs improvement to meet cost targets for CO2 capture. This study attempts to develop membranes with multiple permselective mechanisms in order to enhance CO2 separation performance of fixed carrier membrane. In this study, a novel membrane with multiple permselective mechanisms of solubility selectivity and reaction selectivity was developed by incorporating CO2-selective adsorptive silica nanoparticles in situ into the tertiary amine containing polyamide membrane formed by interfacial polymerization (IP). Various techniques were employed to characterize the polyamide and polyam-ide-silica composite membranes. The TGA result shows that nanocomposite membranes exhibit superior thermal stability than pure polyamide membranes. In addition, gas permeation experiments show that both nanocomposite membranes have larger CO2 permeance than pure polyamide membranes. The enhanced CO2/N2 separation per-formance for nanocomposite membranes is mainly due to the thin film thickness, and multiple permselective mechanisms of solubility selectivity and reaction selectivity.
