Based on the theories of cellar biology a reaction-diffusion-like dynamic equation valid for the popular growth of single bacillus was established by means of the nonlinear method of the dynamic systems.Furthermore,th...Based on the theories of cellar biology a reaction-diffusion-like dynamic equation valid for the popular growth of single bacillus was established by means of the nonlinear method of the dynamic systems.Furthermore,the investigations of numerical simulations and experiments of this evolutionary equation were analysised.These exploratory results are helpful to complete the biological wave theory.展开更多
Due to some deficiencies of the polysaccharides degradation by the methods of chemical,thermal or enzymatic treatment,sonication was introduced for the degradation of Porphyra yezoensis polysaccharide(PYPS).The Mark-H...Due to some deficiencies of the polysaccharides degradation by the methods of chemical,thermal or enzymatic treatment,sonication was introduced for the degradation of Porphyra yezoensis polysaccharide(PYPS).The Mark-Houwink equation,showing the relationship between molecular weight and intrinsic viscosity,was set up.It was found from the results of the degradation dynamics that there was an exponential relation between the rate constant and treatment time of sonication,different from the traditional chemical,thermal or enzymatic treatment.The activation energy of the degradation was 52.13 kJ·mol-1,and it could be preliminarily concluded that ultrasonic degradation was better than the enzymatic ones.展开更多
文摘Based on the theories of cellar biology a reaction-diffusion-like dynamic equation valid for the popular growth of single bacillus was established by means of the nonlinear method of the dynamic systems.Furthermore,the investigations of numerical simulations and experiments of this evolutionary equation were analysised.These exploratory results are helpful to complete the biological wave theory.
文摘Due to some deficiencies of the polysaccharides degradation by the methods of chemical,thermal or enzymatic treatment,sonication was introduced for the degradation of Porphyra yezoensis polysaccharide(PYPS).The Mark-Houwink equation,showing the relationship between molecular weight and intrinsic viscosity,was set up.It was found from the results of the degradation dynamics that there was an exponential relation between the rate constant and treatment time of sonication,different from the traditional chemical,thermal or enzymatic treatment.The activation energy of the degradation was 52.13 kJ·mol-1,and it could be preliminarily concluded that ultrasonic degradation was better than the enzymatic ones.
文摘为设定多官能团聚叠氮缩水甘油醚(ATP)在聚合物粘结炸药(PBX)中应用时的固化工艺参数,开展ATP基PBX固化测试方法和固化工艺实验研究。采用非等温差示扫描量热法和流变法进行实验,研究ATP基PBX固化过程中热量和储能模量的变化,获得PBX的固化反应动力学方程和固化工艺参数。实验结果表明:流变法可作为表征ATP基PBX固化反应的测试方法,ATP基PBX的固化反应动力学方程为dαdt=2.0×1019exp-1.51×105RTα0.42(1-α)1.30,α为固化度,t为时间,R为气体常数,T为温度。ATP基PBX直接在60℃恒温固化时PBX内部出现大量气孔,采用先30℃后60℃的阶梯固化工艺时PBX内部无气孔;ATP基PBX 30℃的最优固化时间为68 h,60℃的最优固化时间为66 h.
