Objective: To apply PS-T in di?erent phases of carcinoma formation and development, and research the mechanism of anti-carcinoma of PS-T in the cytological level. Methods: N-nitrosodiethylamine ...Objective: To apply PS-T in di?erent phases of carcinoma formation and development, and research the mechanism of anti-carcinoma of PS-T in the cytological level. Methods: N-nitrosodiethylamine (DENA) and CCl4 were applied jointly to duplicate the rat hepatocirrhosis and hepatic cancer model. The rats were divided into 7 groups and were administrated via nasal-stomach tube with PS-T in di?erent phases to interfere the cancer genesis and development. All the rats were killed in 20 weeks for pathological observation. Results: The loss of body weight of rats slowed down in the PS-T-treated group, and the carcinogenesis rate was signi?cantly decreased correspondingly. PS-T could also inhibit the carcinogenesis by supressing the hepatocirrhosis, which showed the positive correlation between the curative e?ect and the curative period. Conclusion: Application of PS-T during cancer induction showed a signi?cant e?ect on preventing and supressing cancer. PS-T might be an ideal drug for clinical anti-cancer therapy. And it will be a main drug in both combined and single treatments for tumor.展开更多
The effect of different sulfonation degree on properties of sulfonated syndiotactic polystyrene(S s PS) was investigated by 1H NMR, 13 C NMR,FTIR,DSC and WAXD.The results of 13 C NMR showed that a peak at δ =145 5 ap...The effect of different sulfonation degree on properties of sulfonated syndiotactic polystyrene(S s PS) was investigated by 1H NMR, 13 C NMR,FTIR,DSC and WAXD.The results of 13 C NMR showed that a peak at δ =145 5 appeared in all S s PS spectra,which proved that the syndiotactic structure of syndiotactic polystyrene( s PS) still existed in S s PS.With increasing degree of sulfonition,the chemical shifts of C 1 and C\|3 for sulfonated benzene ring turned out to be wider. 1 H NMR spectra showed that C\|3 for sulfonated benzene ring had a chemical shift of 7 66.FTIR spectra showed that sulfonic acid groups were introduced on the para position of benzene rings and with increasing sulfonation degree,the absorption strength of 612/1600 cm 1 ,834/1600cm -1 increased,but the absorption strength of 1078/1600cm -1 decreased.The absorption of ～1030cm -1 ,～1179cm -1 ,～1217cm -1 appeared when the sulfonation degree was higher that 6%. s PS and S s PS H 2 2 had absorption at 975 and 943cm -1 and also had double peaks around ～1175cm -1 ;DSC showed that with increasing sulfonation degree, the glass transition temperature increased, the melt temperature,crystallization temperature and crystallization degree decreased;S s PS couldn’t crystallize when sulfonation degree was higher that 6mol%;WAXD proved that s PS had the α and β crystal types, however,S s PS with 2 2% sulfonation degree only had the β crystal type, and S s PS with 6 1% sulfonation degree didn’t crystallize.展开更多
The usual mixed sensitivity H ∞ design is not suitable for servo design, because there exist pole/zero cancellations and the resulting control law will include a pure differentiation factor. This paper presents an al...The usual mixed sensitivity H ∞ design is not suitable for servo design, because there exist pole/zero cancellations and the resulting control law will include a pure differentiation factor. This paper presents an alternative design, i.e. the PS/T two block design. It is proved that in the PS/T problem there is no cancellation of the plant poles by the controller. The PS/T problem can take full advantage of the two block design approach: simplicity and intuition. And the use of PS in design is more practical for it represents the system’s disturbance rejection performance. The PS/T two block design details are discussed and illustrated by an example. The results of this paper can also be used for MIMO systems.展开更多
The main subject of this work is about the effect of T-ZnOw on the toughness and stiffness of polystyrene (PS).In order to avoid the rupture of T-ZnOw during the melt processing,T-ZnOw/PS composites were obtained via ...The main subject of this work is about the effect of T-ZnOw on the toughness and stiffness of polystyrene (PS).In order to avoid the rupture of T-ZnOw during the melt processing,T-ZnOw/PS composites were obtained via the combination of solution blending and injection moulding methods.Although the tensile strength of the composites decreases slightly,the impact strength and tensile modulus increase with the increase of the T-ZnOw content in the matrix.The stiffness and toughness of the composites are enhance...展开更多
文摘Objective: To apply PS-T in di?erent phases of carcinoma formation and development, and research the mechanism of anti-carcinoma of PS-T in the cytological level. Methods: N-nitrosodiethylamine (DENA) and CCl4 were applied jointly to duplicate the rat hepatocirrhosis and hepatic cancer model. The rats were divided into 7 groups and were administrated via nasal-stomach tube with PS-T in di?erent phases to interfere the cancer genesis and development. All the rats were killed in 20 weeks for pathological observation. Results: The loss of body weight of rats slowed down in the PS-T-treated group, and the carcinogenesis rate was signi?cantly decreased correspondingly. PS-T could also inhibit the carcinogenesis by supressing the hepatocirrhosis, which showed the positive correlation between the curative e?ect and the curative period. Conclusion: Application of PS-T during cancer induction showed a signi?cant e?ect on preventing and supressing cancer. PS-T might be an ideal drug for clinical anti-cancer therapy. And it will be a main drug in both combined and single treatments for tumor.
文摘The effect of different sulfonation degree on properties of sulfonated syndiotactic polystyrene(S s PS) was investigated by 1H NMR, 13 C NMR,FTIR,DSC and WAXD.The results of 13 C NMR showed that a peak at δ =145 5 appeared in all S s PS spectra,which proved that the syndiotactic structure of syndiotactic polystyrene( s PS) still existed in S s PS.With increasing degree of sulfonition,the chemical shifts of C 1 and C\|3 for sulfonated benzene ring turned out to be wider. 1 H NMR spectra showed that C\|3 for sulfonated benzene ring had a chemical shift of 7 66.FTIR spectra showed that sulfonic acid groups were introduced on the para position of benzene rings and with increasing sulfonation degree,the absorption strength of 612/1600 cm 1 ,834/1600cm -1 increased,but the absorption strength of 1078/1600cm -1 decreased.The absorption of ～1030cm -1 ,～1179cm -1 ,～1217cm -1 appeared when the sulfonation degree was higher that 6%. s PS and S s PS H 2 2 had absorption at 975 and 943cm -1 and also had double peaks around ～1175cm -1 ;DSC showed that with increasing sulfonation degree, the glass transition temperature increased, the melt temperature,crystallization temperature and crystallization degree decreased;S s PS couldn’t crystallize when sulfonation degree was higher that 6mol%;WAXD proved that s PS had the α and β crystal types, however,S s PS with 2 2% sulfonation degree only had the β crystal type, and S s PS with 6 1% sulfonation degree didn’t crystallize.
文摘The usual mixed sensitivity H ∞ design is not suitable for servo design, because there exist pole/zero cancellations and the resulting control law will include a pure differentiation factor. This paper presents an alternative design, i.e. the PS/T two block design. It is proved that in the PS/T problem there is no cancellation of the plant poles by the controller. The PS/T problem can take full advantage of the two block design approach: simplicity and intuition. And the use of PS in design is more practical for it represents the system’s disturbance rejection performance. The PS/T two block design details are discussed and illustrated by an example. The results of this paper can also be used for MIMO systems.
基金the National Natural Science Foundation of China (No.50403019)also partly supported by the Opening Project of State Key Laboratory of Polymer Materials Engineering (Sichuan University).
文摘The main subject of this work is about the effect of T-ZnOw on the toughness and stiffness of polystyrene (PS).In order to avoid the rupture of T-ZnOw during the melt processing,T-ZnOw/PS composites were obtained via the combination of solution blending and injection moulding methods.Although the tensile strength of the composites decreases slightly,the impact strength and tensile modulus increase with the increase of the T-ZnOw content in the matrix.The stiffness and toughness of the composites are enhance...
