带Carathodory函数的积分微分方程周期边值问题

本文研究带Caratheodory函数的非线性Volterra型积分微分方程周期边值问题．对于下解α与上解β的两种情形：或,解的存在性和建立极解的单调迭代法均被讨论．     

带Caratheodory函数的积分微分方程周期边值问题

本文研究了带Ｃａｒａｔｈｅｏｄｏｒｙ函数的非线性Ｖｏｌｔｅｒｒａ型积分微分方程周期边值问题，对于下解α与上解β的两种情形；α≤β或β≤α，解的存在性和建立极解的单调迭代法均被讨论。     

聚氨酯对聚乳酸溶液流变性能的影响

采用高级旋转流变仪研究了1,4-二氧六环/左旋聚乳酸/聚氨酯(DO/PLLA/PU)共混溶液的流变性能,探讨了PU的加入对共混溶液的流动曲线、非牛顿指数及表观粘流活化能的影响.结果表明,在实验条件下,共混溶液为剪切变稀非牛顿流体,PU含量的增加使得共混溶液的表观粘度增大;共混溶液的非牛顿指数的研究表明,随着PU含量的增加,非牛顿指数呈现下降趋势,随着温度的升高,同一组成的共混溶液非牛顿指数也呈现下降趋势,说明共混溶液的粘度随着PU含量的增加以及温度的升高,对剪切速率的依赖性依然很强.粘流活化能的研究结果表明,在较高剪切速率下,PU的加入使得共混溶液对温度的敏感性下降.     

NECESSARY AND SUFFICIENT CONDITIONS OF A PLANE n-DEGREE SYSTEM WITH DULAC’S CENTER

1IntroductionandLemmasH.Dulacshowedclearlyin[l]that:forsystemifthereexistsholomorphismintegralwithindependentoftinsomeneighborhoodofO(0,0),thatis,integrating(1),wehavethencoordinateoriginOiscalledacenterinDulac'smeaning,where*ProjectsupportedbytheNNSFofSh…     

带Carathéodory函数的积分微分方程周期边值问题

本文研究带Carathéodoty函数的非线性Volterra型积分微分方程周期边值问题.对于下解α与上解β的两种情形:α≤β或β≤α,解的存在性和建立极解的单调迭代法均被讨论.     

Implementation of quantum partial search with superconducting quantum interference device qudits in cavity QED

We present a method to implement the quantum partial search of the database separated into any number of blocks with qudits,D-level quantum systems.Compared with the partial search using qubits,our method needs fewer iteration steps and uses the carriers of the information more economically.To illustrate how to realize the idea with concrete physical systems,we propose a scheme to carry out a twelve-dimensional partial search of the database partitioned into three blocks with superconducting quantum interference devices(SQUIDs)in cavity QED.Through the appropriate modulation of the amplitudes of the microwave pulses,the scheme can overcome the non-identity of the cavity–SQUID coupling strengths due to the parameter variations resulting from the fabrication processes.Numerical simulation under the influence of the cavity and SQUID decays shows that the scheme could be achieved efficiently within current state-of-the-art technology.     

柱前衍生-气相色谱法测定2-氯丙酸的光学纯度

提出了柱前衍生-气相色谱法测定2-氯丙酸的光学纯度。在无水硫酸镁存在下,相同体积的2-氯丙酸与二氯亚砜在冰浴中进行衍生反应30 min,所得2-氯丙酸衍生物2-氯丙酸甲酯消旋体经CYCLOSIL-B手性气相色谱柱分离,柱温为65℃。R-(+)-2-氯丙酸甲酯和S-(-)-2-氯丙酸甲酯的分离度大于2.0。方法用于2-氯丙酸光学纯度的测定,所得测定值与理论值基本一致。