Ion chromatographic method development for monitoring of seawater quality used in over-the-counter pharmaceutical industry

A methodology is developed for the analysis of inorganic anions (fluoride, chloride, bromide, sulphate) in seawater used for over-the-counter (OTC) nasal spray production. The eluent flow rate and concentration of eluent competing ions are optimised by using an artificial neural network resolution model in combination with normalised resolution product criterion function. The developed artificial neural network resolution model shows good predictive ability R2 > or = 0.9973. The determined ion chromatographic parameters enable baseline separation of all components of interest. By performing a validation procedure and a number of statistical tests, it is shown that the developed ion chromatographic method has superior performance characteristics: linearity R2 > or = 0.9993, recovery = 99.77-100.65%, repeatability RSD < or = 1.85%. This result proves that the proposed method can be used for routine quality assurance analysis in OTC pharmaceutical industry.     

三代树状碳硅烷液晶研究——端基含丁氧基偶氮苯介晶基元

用发散法合成周边含丁氧基偶氮苯介晶基元(M5)端基新的三代树状碳硅烷(D3) 液晶,并用元素分析,核磁共振,激光解吸电离飞行时间质谱(MALDI-TOF-MS),红外、 紫外、偏光显微镜、差示扫描量热（DSC）和广角X射线衍射（WAXD）表征，D3为向 列相与M5相同，树状物相态由介晶基元相态决定，D3相行为；K79N1261116N，D3熔 点比M5降低33℃，D3清亮点比M5增加2℃，D3液晶态温区比M5加宽35℃。     

Production of laccase by immobilized cells of Agaricus sp.

Laccase was produced in the supernatant of culture of a local isolate of Agaricus sp. obtained from decaying Ficus religiosa wood. The enzyme was produced at a constitutive level when growing the fungus in a nitrogenlimited medium supplemented with either glycerol, glucose, fructose, mannitol, arabinose, maltose, sacch arose, cellulose, or cellobiose. Atwo-to sixfold increase in enzyme specific activity was observed when growing the strain in the presence of straw, xylan, xylose, lignosulfonate, veratryl alcohol, and ferulic and veratric acid. Experimentsare consistent with the existence of an induction control on laccase and the absence of a form of carbon catabolite repression mediated by noninducing carbon sources. Immobilization of the Agaricus sp. on several supports, including polyurethane foam, textilestrips, and straw, resulted in an increase of enzyme production as compared to cultivation in liquid medium.     

国民经济第三产业发展预测的等维新息模型

国民经济系统是一个典型的灰色系统,利用灰色系统理论的GM(1 ,1 )模型建立了我国第三产业产值的预测模型,并对2 0 0 1年第三产业增加值进行了预测,进而建立了等维新息模型,得到2 0 0 1—2 0 0 5年第三产业产值的预测值,取得了良好的分析效果.     

Design of slow extraction system for therapy synchrotron

Based on the optimized design of the lattice for therapy synchrotron and considering the requirement of radiation therapy, the third order resonant extraction is adopted. Using the momentum-amplitude selection method, the extraction system is designed and optimized. An extraction efficiency of more than 97% and a momentum spread less than 0.11% are obtained.     

OSCILLATION OF THIRD ORDER DELAY DIFFERENTIAL EQUATIONS WITH IMPULSES

In this paper we study the oscillation and asymptotic behavior of third order delay differential equations with impulses.Some new sufficient conditions which guarantee that every solution is oscillatory or converges to zero are obtained. Three examples are also given to illustrate our main results.     

Stability and Boundedness Results for Solutions of Certain Third Order Nonlinear Vector Differential Equations

In this paper, we investigate the asymptotic stability of the zero solution and boundedness of all solutions of a certain third order nonlinear ordinary vector differential equation. The results are proved using Lyapunov’s second (or direct method). Our results include and improve some well known results existing in the literature.     

Damage performance of thin-film beam splitter for third harmonic separation under simultaneous exposure to 1ω and 3ω pulses

Laser damage behaviors of thin-film beam splitters for third harmonic separation were investigated under the simultaneous exposure of fundamental frequency (1ω) and the third harmonics laser beam (3ω). The samples were prepared by conventional e-beam evaporation, and the surface laser-induced damage thresholds (LIDT) of the samples were obtained for the irradiations of 3ω only and 3ω with various fluence of 1ω. It was found that external 1ω can raise damage probability of multilayer films; the higher the 1ω energy density, the lower the damage threshold. Additionally, numerical simulation of damage probability was given for the simultaneous exposure to two beams.     

大动态范围高效率三次谐波转换的特性研究

根据激光核聚变(ICF)物理实验中整形脉冲对倍频器的要求,对高功率密度下的KDP晶体Ⅰ/Ⅱ角度失谐和Ⅱ/Ⅱ偏振失配双倍频双混频两种高效三倍频方案进行了详细的模拟计算和对比分析.结果表明:该方案具有动态范围大、调节精度降低等优点,对工程设计具有参考价值.     

“摩擦力是相互作用力”的简捷演示方案

设计了两种简捷演示静摩擦力是一对作用力和反作用力的实验方案。