目的分析高血压患者生命质量(quality of life,QOL)的影响因素。方法应用SF-36量表(中文版)调查213例原发性高血压患者的QOL情况,以单因素方差分析、多元逐步线性回归对12种因素进行分析,寻找主要影响因素。结果年龄、居住地区、婚姻状...目的分析高血压患者生命质量(quality of life,QOL)的影响因素。方法应用SF-36量表(中文版)调查213例原发性高血压患者的QOL情况,以单因素方差分析、多元逐步线性回归对12种因素进行分析,寻找主要影响因素。结果年龄、居住地区、婚姻状况、在岗情况、血压控制情况、心功能、心血管系统合并症及家庭人均月收入对患者QOL总得分有显著影响。多元逐步线性回归分析显示,年龄、血压控制情况、心功能、心血管系统合并症及家庭人均月收入是主要影响因素,偏回归系数分别为-4.266、86.237、-48.048、-45.071和36.011。结论关注老龄及低收入高血压患者,积极控制血压、改善心功能、治疗心血管系统合并症对提高患者QOL有重要意义。展开更多
The measured reduced viscosity\|concentration ( η \-\{sp\}/ c\|c ) curves of miscible PPO/PS、 immiscible PMMA/PS mixtures with different composition in toluene all deviate from linear and reveal downward turn in ext...The measured reduced viscosity\|concentration ( η \-\{sp\}/ c\|c ) curves of miscible PPO/PS、 immiscible PMMA/PS mixtures with different composition in toluene all deviate from linear and reveal downward turn in extremely dilute concentration region. Moreover, in the extremely dilute concentration region, the η \-\{sp\}/ c\|c curve of immiscible PVC/PS mixture solution shows upward turn in THF, while shows downward turn in DCE. These experimental facts indicate that such viscosity anomaly is not dependent of miscibility, but resulted from wall effects. Regarding the polymer mixture as a single solute, the interference of wall effects on viscosity measurement could be eliminated quantitatively with a proposed theoretical formula. After corrected, the true viscosity data of mixture shows normal linear η\-\{s p\}/ c\|c curve in the dilute and extremely dilute concentration region.展开更多
Thermal evolution behavior of solution cast film of Poly(2,6 dimethyl 1,4 phenylene oxide)(PPO)/polystyrene(PS) blend was investigated by conventional and modulated differential scanning calorimetry. It was found that...Thermal evolution behavior of solution cast film of Poly(2,6 dimethyl 1,4 phenylene oxide)(PPO)/polystyrene(PS) blend was investigated by conventional and modulated differential scanning calorimetry. It was found that the original PPO/PS blend film is actually composed by a crystalline PPO phase and a non crystalline compatible PPO PS phase. The phase segregated structure state(A) will evolve to non crystalline homogenous structure(B) by subsequent thermal treatment. The effect of annealing temperature on the evolution process was discussed.展开更多
The chain length dependency of molar association constant K_a of polymer in solution was investigated theoretically. K_a is proportional to the effective hydrodynamic volume V_ eff of polymer chain in solution. V_ eff...The chain length dependency of molar association constant K_a of polymer in solution was investigated theoretically. K_a is proportional to the effective hydrodynamic volume V_ eff of polymer chain in solution. V_ eff is the product of a shape factor and hydrodynamic volume. On the basis of these results, the observed enhancement of Huggins coefficient for short chain and branched polymer could be satisfactorily interpreted.展开更多
文摘目的分析高血压患者生命质量(quality of life,QOL)的影响因素。方法应用SF-36量表(中文版)调查213例原发性高血压患者的QOL情况,以单因素方差分析、多元逐步线性回归对12种因素进行分析,寻找主要影响因素。结果年龄、居住地区、婚姻状况、在岗情况、血压控制情况、心功能、心血管系统合并症及家庭人均月收入对患者QOL总得分有显著影响。多元逐步线性回归分析显示,年龄、血压控制情况、心功能、心血管系统合并症及家庭人均月收入是主要影响因素,偏回归系数分别为-4.266、86.237、-48.048、-45.071和36.011。结论关注老龄及低收入高血压患者,积极控制血压、改善心功能、治疗心血管系统合并症对提高患者QOL有重要意义。
文摘The measured reduced viscosity\|concentration ( η \-\{sp\}/ c\|c ) curves of miscible PPO/PS、 immiscible PMMA/PS mixtures with different composition in toluene all deviate from linear and reveal downward turn in extremely dilute concentration region. Moreover, in the extremely dilute concentration region, the η \-\{sp\}/ c\|c curve of immiscible PVC/PS mixture solution shows upward turn in THF, while shows downward turn in DCE. These experimental facts indicate that such viscosity anomaly is not dependent of miscibility, but resulted from wall effects. Regarding the polymer mixture as a single solute, the interference of wall effects on viscosity measurement could be eliminated quantitatively with a proposed theoretical formula. After corrected, the true viscosity data of mixture shows normal linear η\-\{s p\}/ c\|c curve in the dilute and extremely dilute concentration region.
文摘Thermal evolution behavior of solution cast film of Poly(2,6 dimethyl 1,4 phenylene oxide)(PPO)/polystyrene(PS) blend was investigated by conventional and modulated differential scanning calorimetry. It was found that the original PPO/PS blend film is actually composed by a crystalline PPO phase and a non crystalline compatible PPO PS phase. The phase segregated structure state(A) will evolve to non crystalline homogenous structure(B) by subsequent thermal treatment. The effect of annealing temperature on the evolution process was discussed.
文摘The chain length dependency of molar association constant K_a of polymer in solution was investigated theoretically. K_a is proportional to the effective hydrodynamic volume V_ eff of polymer chain in solution. V_ eff is the product of a shape factor and hydrodynamic volume. On the basis of these results, the observed enhancement of Huggins coefficient for short chain and branched polymer could be satisfactorily interpreted.