电阻加热炉解耦模糊Simth预估PID控制研究与仿真

在电阻加热炉系统中,提出一种解耦模糊Smith预估PID控制器来优化系统的动态响应性能指标,并改善系统因被控对象参数改变或因干扰作用引起系统控制性能变差的现象。通过对具有纯滞后的一阶惯性电阻加热炉系统的仿真可见,解耦模糊Simth预估PID控制器获得的系统动态响应性能指标明显优于常规的PID控制器或Smith预估PID控制器,且在被控对象参数改变或出现干扰时系统的控制性能也得到了较好的改善。解耦模糊Smith预估PID控制的模糊语言规则少,系统响应速度较快。     

一个正规定则及其推论

本文证明了亚纯函数的一个正规定则,它是montel定则的一般化,另外,我们给出它的一些应用。     

Enantioselective assay of S（＋）－ and R（－）－propafenone in human urine by using RP－HPLC with pre－column chiral derlvatization

The enantioselective assay for S(+)- and R(-)-propafenone (PPF) in human urine that developed in this work involves extraction of propafenone from human urine and using S(+)-propafenone as internal standard, chiral derivatization with 2,3,4,6-tetra-O-beta-D-glucopranosyl isothiocyanate, and quantitation by an RP-HPLC system with UV detection (lambda=220 nm). A baseline separation of propafenone enantiomers was achieved on a 5-microm reverse phase ODS column, with a mixture of acetic acid (25:12:0.02,v/v) as mobile phase. There was good linear relationship from 24.9 ng/ml to 1875.0 ng/ml for both of enantiomers. The regression equations of the standard curves based on C(S-PPF) (or C(R-PPF)) versus ratio of A(S-PPF)/A(S) (or A(R-PPF)/A(S)) were y=0.0032x-0.081, (r=0.999) for S-PPF and y=0.0033x+0.0039, (r=0.998) for R-PPF, respectively. The method's limit of detection was 12.5 ng/ml for both enantiomers, and the method's limit of quantitation was 28.2+/-0.52 ng/ml for S-PPF, 30.4+/-methanol:water:glacial 0.53 ng/ml for R-PPF (RSD<8%, n=5). The analytical method yielded average recovery of 98.9% and 100.4% for S-PPF and R-PPF, respectively. The relative standard deviation was no more than 6.11% and 6.22% for S-PPF and R-PPF, respectively. The method enabled study of metabolism of S(+)- and R(-)-propafenone in human urine. The results from 7 volunteers administered 150 mg racemic propafenone indicated that propafenone enantiomers undergo stereoselective metabolism and that in the human body, S(+)-propafenone is metabolized more extensively than R(-)-propafenone.     

Mathematical modeling of salt-gradient ion-exchange simulated moving bed chromatography for protein separations

The salt-gradient operation mode used in ion-exchange simulated moving bed chromatography (SMBC) can improve the efficiency of protein separations. A detailed model that takes into account any kind of adsorption/ion-exchange equilibrium, salt gradient, size exclusion, mass transfer resistance, and port periodic switching mechanism, was developed to simulate the complex dynamics. The model predictions were verified by the experimental data on upward and downward gradients for protein separations reported in the literature. All design and operating parameters (number, configuration, length and diameter of columns, particle size, switching period, flow rates of feed, raffinate, desorbent and extract, protein concentrations in feed, different salt concentrations in desorbent and feed) can be chosen correctly by numerical simulation. This model can facilitate the design, operation, optimization, control and scale-up of salt-gradient ion-exchange SMBC for protein separations.     

用于周期复振荡研究的微分方程解的一个结果*

提出了“组合优势条件”,并用其发民服Ｓ．Ｂａｎｋ和Ｊ．Ｌａｎｇｌｅｙ于１９９２年证明了的用于周期复振荡研究的一个重要结果,大大扩充了其适用性。     

纯硅芯石英光纤的研制

结合改进的化学汽相沉积(MCVD)法的特点, 设计纯硅芯石英光纤最佳折射率剖面结构, 并对采用改进的石墨炉加热的MCVD法制备纯硅芯石英光纤预制棒和拉丝工艺进行讨论. 分析了制作工艺中内包层掺氟量的提高、内包层厚度增加和纤芯折射率保持等难点的原理, 并给出了解决方案. 同时给出了制备的纯硅芯石英光纤预制棒的折射率剖面图和拉制成型的纯石英光纤折射率剖面图.     

分担值与正规定则

设F为单位圆盘上的一个亚纯函数族，a，b为两个判别的有穷复数，b≠0，如果A↓f∈F，f的零点至少是重级的，且E（a／f^（k））包含E（a,f），E（b,f^（k））包含E（b,f），则F在单位圆盘上正规．     

分担值与正规函数

研究函数的分担值与正规族的关系.证明了:设f(z)是复平面上的亚纯函数,a是一个非零的有穷复数,f零点的重数至少为k.且满足(Ⅰ)f(z)=0当且仅当f~(j)(z)=0;(Ⅱ)当f~(k)(z)=a时,f(z)=a.则f(z)是复平面上的正规函数.     

全纯函数涉及公共值的正规定则

本文研究全纯函数涉及公共值的正规族问题．设F为单位圆△内的全纯函数族，α，b与c为3个有穷复数，且b≠0，c≠0，a≠6．若对每个f∈F，f的零点重级至少是k，并且^-Ef（0）=^-Ef（k）（α）,^-Ef（k）（b）↓-C^Ef（c），则F在单位圆△内正规．     

与分担值有关的正规定则

设F为单位圆盘上的一族亚纯函数,a非零有穷复数,k为任一正整数,若对每一f∈F,f零点的重数≥k 1(k≥2),极点重数≥2,′f和f(k)IM分担值a,则F在单位圆盘上正规。