CoPc complexes were supported on the acid alumina using in-situ method.The resulting compounds were characterized by DTA-TGA thermal analysis,ICP,solid-state infrared,and Ultraviolet/visible spectroscopy,and tested as...CoPc complexes were supported on the acid alumina using in-situ method.The resulting compounds were characterized by DTA-TGA thermal analysis,ICP,solid-state infrared,and Ultraviolet/visible spectroscopy,and tested as catalysts for the eposidation of cyclohexene under ambient conditions using molecular dioxygen as oxidant and isobutyraldehyde as sacrificial reagent.The optimums for the reaction have been obtained.Under the conditions of time:9h,temperature:35℃,isobutyraldehyde to cyclohexene ratio:4,the weight of catalyst: 0.05g,the volume of solvent:20mL,the conversion of cyclohexene attained 73.5% and the selectivity of cyclohexene epoxide,84.1%展开更多
The paper introduces the preparation of floating TiO2/beads photocalyst attached to the hollow glass micro-beads surface by sol-gel technique using tetrabutyl titanate as material and the preparation of floating CoPcS...The paper introduces the preparation of floating TiO2/beads photocalyst attached to the hollow glass micro-beads surface by sol-gel technique using tetrabutyl titanate as material and the preparation of floating CoPcS/TiO2/beads by dip-coatig technique. The optimal factor of degradation of vegetable oil floating on water using CoPcS/TiO2/beads was studied. The result showed that the removal rate of vegetable oil floating on water can highly reach 90% at the optimal condition （acidity or neutrality, 375W medium-pressure mercury vapour lamp, illumination 2h-3h, lg CoPcS/TiO2/beads）. The photocatalytic removal efficiency causing by CoPcS/TiO2/beads was increased rapidly by adding a trace amount of H2O2.展开更多
It is known that urea and guanidine hydrochloride（GuHC1） induce conformational change of proteins in a certain range of molar ratios. In our research, a-naphthylamine（NA） above 10^-4 mol/L at pH 7.0 was discovered...It is known that urea and guanidine hydrochloride（GuHC1） induce conformational change of proteins in a certain range of molar ratios. In our research, a-naphthylamine（NA） above 10^-4 mol/L at pH 7.0 was discovered to perturb the conformation of CopC, a copper resistant protein with a Greek fl-barrel motif; this was reflected by the greater fluorescence quenching and red-shifted emission peak of CopC. The conformation change of CopC was also verified in acrylamide collision experiment by comparing quenching levels of CopC in the presence or the abscence of NA. Comparison of emission change of CopC-Cu^2＋ with that of apo-CopC showed a consistent result with their denaturation in GuHCl. And decreasing fluorescence polarization of CopC with increasing NA concentration is consistent with a more extend conformation of CopC. Interaction mechanism was also explored.展开更多
Customer Operations Performance Center Inc (COPC) is the world’s leading authority on Contact Center Operations Management. The COPC 2000 Standard is a comprehensive operating model for Contact Centre Operations. It ...Customer Operations Performance Center Inc (COPC) is the world’s leading authority on Contact Center Operations Management. The COPC 2000 Standard is a comprehensive operating model for Contact Centre Operations. It is a world-wide benchmark and certification for contact centers. As well as an overall performance management system, COPC is designed to reduce costs, increase revenue, and improve service, quality and customer satisfaction. However, many COPC implementation projects failed. In this study, we first review the process of implementing COPC. Then, we identify major barriers in implementing COPC. Organizations should take proper measures in overcoming these barriers to ensure successful implementation of COPC.展开更多
Photocatalyst CoPcS/TiO2 was prepared by sol-gel method. Composite CoPcS/TiO2/K2Ti4O9 was prepared by dipping. It was incandesced at various temperatures and modification effect was compared. The results showed that o...Photocatalyst CoPcS/TiO2 was prepared by sol-gel method. Composite CoPcS/TiO2/K2Ti4O9 was prepared by dipping. It was incandesced at various temperatures and modification effect was compared. The results showed that optical absorption of sample incandesce at 423K occurred significant red-shift. Light absorption width extended from ultraviolet region to visible region, especially there was an intensive absorption between 600 nm and 680 nm. X-ray diffraction spectrogram showed that TiO2 in sample still maintained anatase crystal form. Under the illumination of visible light, photocatalysis degradation experiment was taken with Eosin B as simulated pollutants. Decoloration rate of Eosin B was much improved. The rate can reach 80% in 300 minutes.展开更多
文摘CoPc complexes were supported on the acid alumina using in-situ method.The resulting compounds were characterized by DTA-TGA thermal analysis,ICP,solid-state infrared,and Ultraviolet/visible spectroscopy,and tested as catalysts for the eposidation of cyclohexene under ambient conditions using molecular dioxygen as oxidant and isobutyraldehyde as sacrificial reagent.The optimums for the reaction have been obtained.Under the conditions of time:9h,temperature:35℃,isobutyraldehyde to cyclohexene ratio:4,the weight of catalyst: 0.05g,the volume of solvent:20mL,the conversion of cyclohexene attained 73.5% and the selectivity of cyclohexene epoxide,84.1%
文摘The paper introduces the preparation of floating TiO2/beads photocalyst attached to the hollow glass micro-beads surface by sol-gel technique using tetrabutyl titanate as material and the preparation of floating CoPcS/TiO2/beads by dip-coatig technique. The optimal factor of degradation of vegetable oil floating on water using CoPcS/TiO2/beads was studied. The result showed that the removal rate of vegetable oil floating on water can highly reach 90% at the optimal condition （acidity or neutrality, 375W medium-pressure mercury vapour lamp, illumination 2h-3h, lg CoPcS/TiO2/beads）. The photocatalytic removal efficiency causing by CoPcS/TiO2/beads was increased rapidly by adding a trace amount of H2O2.
基金Supported by the National Natural Science Foundation of China(No. 20771068)the Natural Science Foundation of Shanxi Province, China(No. 2007011024)
文摘It is known that urea and guanidine hydrochloride（GuHC1） induce conformational change of proteins in a certain range of molar ratios. In our research, a-naphthylamine（NA） above 10^-4 mol/L at pH 7.0 was discovered to perturb the conformation of CopC, a copper resistant protein with a Greek fl-barrel motif; this was reflected by the greater fluorescence quenching and red-shifted emission peak of CopC. The conformation change of CopC was also verified in acrylamide collision experiment by comparing quenching levels of CopC in the presence or the abscence of NA. Comparison of emission change of CopC-Cu^2＋ with that of apo-CopC showed a consistent result with their denaturation in GuHCl. And decreasing fluorescence polarization of CopC with increasing NA concentration is consistent with a more extend conformation of CopC. Interaction mechanism was also explored.
文摘Customer Operations Performance Center Inc (COPC) is the world’s leading authority on Contact Center Operations Management. The COPC 2000 Standard is a comprehensive operating model for Contact Centre Operations. It is a world-wide benchmark and certification for contact centers. As well as an overall performance management system, COPC is designed to reduce costs, increase revenue, and improve service, quality and customer satisfaction. However, many COPC implementation projects failed. In this study, we first review the process of implementing COPC. Then, we identify major barriers in implementing COPC. Organizations should take proper measures in overcoming these barriers to ensure successful implementation of COPC.
基金Acknowledgements： This project is supported by the fund of the Plan of Postgraduate Scientific Research Innovation of Jiangsu Province （No. CX07B_175z） and the Natural Science Foundation of Henan Province （No. 0624720029）.
文摘Photocatalyst CoPcS/TiO2 was prepared by sol-gel method. Composite CoPcS/TiO2/K2Ti4O9 was prepared by dipping. It was incandesced at various temperatures and modification effect was compared. The results showed that optical absorption of sample incandesce at 423K occurred significant red-shift. Light absorption width extended from ultraviolet region to visible region, especially there was an intensive absorption between 600 nm and 680 nm. X-ray diffraction spectrogram showed that TiO2 in sample still maintained anatase crystal form. Under the illumination of visible light, photocatalysis degradation experiment was taken with Eosin B as simulated pollutants. Decoloration rate of Eosin B was much improved. The rate can reach 80% in 300 minutes.
