Mean convergence of Hermite-Fejer type interpolation

L^p convergence of Hermite-Fejér interpolation and quasi-Hermite-Fejér interpolation based upon zeros of general orthogonal polynomials is investigated. This paper “almost” characterizes such convergence for all continuous functions. Supported by the National Natural Science Foundation of China.     

Effect of thermal history on crystallization and melting behaviour of lldpe

In this paper two LLDPE samples with their own structural parameters were studied by means of DSC. Experimental results show that DSC was good for revealing slight structural difference between these two samples. Furthermore, the effect of thermal history on crystallization and melting behaviour of LLDPE was observed clearly through varying conditions of thermal treatment.

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Zusammenfassung Mittels DSC werden zwei LLDPE-Proben mit ihren eigenen Strukturparametern untersucht. Die Versuchsergebnisse zeigen, da\ sich DSC gut eignet, um gering fügige Unterschiede dieser zwei Proben nachzuweisen. Weiterhin wurde unter verschiedenen Bedingungen der Einflu\ der thermischen Vorgeschichte auf das Kristallisations-und Schmelzverhalten von LLDPE untersucht.

     

一种几何定理机器证明的零维化方法

本文对一类初等几何定理的证明给出了一种机械化方法，利用这种方法，可计算出一个由有限个素理想组成的集合，所有属于假设部分对应的某一扩域上的理想的素理想都在这个集合中出现并且可以挑选出来．因而一个几何定理一般真确，当且仅当终结多项式属于全部的这种素理想，即对其不可约特征列的余式为零．     

A STUDY OF SILICA-SUPPORTED CROSS-LINKED POLY (MALEIC ACID-CO-STYRENE)-PLATINUM COMPLEX IN THE HYDROGENATION OF p-CRESOL

A silica-supported cross-linked poly(maleic acid -co- styrene)-platinum complex (PMS-Pt) has been prepared and found to be active in the hydrogenation of p-cresol undermild conditions (303-323K, 1.01×10~5Pa). In this hydrogenation system water servesas a solvent and p-cresol can be converted to 4-methylcyclohexanol quantitatively via4-methylcyclohexanone as intermediate.     

Cu,Zn-SOD酶模型配合物催化O2-歧化作用的研究

为了解Cu,Zn-SOD酶中Cu周围环境对催化O_2~-歧化作用活性的影响,本文用NBT法测定了Cu,Zn-SOD酶及一系列咪唑桥异核模型配合物催化O_2~-歧化作用的活性,并用ESR方法鉴测了其中一个配合物与O_2~-作用的中间过程。结果表明,具有平面四方构型或轴向有弱配位H_2O或ClO_4~-基团的四方锥构型的Cu~(2+)配合物具有较高活性,说明配合物催化歧化O_2~-过程中,Cu~(2+)可能首先以轴向与O_2~-配位,形成Cu~(2+)-O_2~-中间化合物,紧接着Cu~(2+)被还原成Cu~+。     

Ionization and dissociation of CH3I in intense laser field

The ionization-dissociation of methyl iodide in intense laser field has been studied using a reflection time-of-flight mass spectrometry (RTOF-MS), at a laser intensity of < or =6.6x10(14) W/cm(2), lambda=798 nm, and a pulse width of 180 fs. With the high resolution of RTOF-MS, the fragment ions with the same M/z but from different dissociation channels are resolved in the mass spectra, and the kinetic energy releases (KERs) of the fragment ions such as I(q+) (q=1-6), CH(m) (+) (m=0-3), C(2+), and C(3+) are measured. It is found that the KERs of the fragment ions are independent of the laser intensity. The fragments CH(3) (+) and I(+) with very low KERs (<1 eV for CH(3) (+) and <0.07 eV for I(+)) are assigned to be produced by the multiphoton dissociation of CH(3)I(+). For the fragments CH(3) (+) and I(+) from CH(3)I(2+), they are produced by the Coulomb explosion of CH(3)I(2+) with the interaction from the covalent force of the remaining valence electrons. The split of the KER of the fragments produced from CH(3)I(2+) dissociation is observed experimentally and explained with the energy split of I(+)((3)P(2)) and I(+)((3)P(0,1)). The dissociation CH(3)I(3+)-->CH(3) (+)+I(2+) is caused by Coulomb explosion. The valid charge distance R(c) between I(2+) and CH(3) (+), at which enhanced ionization of methyl iodide occurs, is obtained to be 3.7 A by the measurements of the KERs of the fragments CH(3) (+) and I(2+). For the CH(3)I(n+) (n> or =3), the KERs of the fragment ions CH(3) (p+) and I(q+) are attributed to the Coulomb repulsion between CH(3) (p+) and I(q+) from R(c) approximately 3.7 A. The dissociation of the fragment CH(3) (+) is also discussed. By the enhanced ionization mechanism and using the measured KER of I(q+), all the possible Coulomb explosion channels are identified. By comparing the abundance of fragment ions in mass spectrum, it is found that the asymmetric dissociation channels with more charges on iodine, q>p, are the dominant channels.     

速调管矩形波导窗的研究

 运用微波等效电路（微波网络）的方法，研究了大功率速调管矩形波导输出窗的转移矩阵，根据微波无反射条件求解窗的最佳尺寸。利用3维电磁场计算软件ISFEL3D进行精确模拟。将微波等效电路方法的计算结果与ISFEL3D的模拟结果和实验结果相比较，得出结论：运用微波等效电路方法对矩形波导输出窗进行设计，理论较为简单，编程容易实现，计算速度很快，便于参数调整，且计算结果与实际测量误差较小，适合应用于速调管矩形波导输出窗设计的初步阶段。     

带有广义Wolfe线搜索的变尺度算法的收敛性

本文提出一类广义Ｗｏｌｆｅ线搜索模型，并且把它与著名的ＢＦＧＳ方法相结合，对于所得到的算法证明了：对于凸函数算法具有全局收敛性和超线性收敛速度，这推广了参考文献［１］中的结果．     

毛细管型离子色谱-脉冲安培法检测枸杞多糖的单糖组成

采用ICS-5000毛细管离子色谱仪对枸杞多糖中的10种单糖进行了分离测定.优化了前处理过程中影响多糖水解的酸种类、酸浓度、水解温度和时间等参数,优化条件为使用2 mol/L三氟乙酸溶液在100℃下水解120min,在该条件下,果糖回收率约为50％,其余单糖回收率在84％～104％之间.采用新型淋洗液自动发生装置电解产生淋洗液,Capillary CarborPac PA20色谱柱分离,毛细管安培池检测,10种单糖成分标准曲线线性关系良好,相关系数均大于99.9％;检出限在2.5～75 μg/L之间,为枸杞多糖中单糖组分测定提供了新的可行方法.     

AlInP benchmarks for growth of AlGaInP compounds by organometallic vapor-phase epitaxy

We have demonstrated that source material and growth system purity can be successfully evaluated by characterizing AlInP samples grown by organometallic vapor-phase epitaxy with photocurrent versus voltage measurements in an electrochemical cell. The samples can be grown and characterized in about 1 h, making them well-suited for system benchmarks. Zn-doped AlInP has the greatest sensitivity for O contamination, a recurring problem in the growth of AlGaInP alloys. High O concentrations in the Zn-doped benchmarks cause the photoresponse to fall dramatically. Secondary ion mass spectrometry data are consistent with compensation of Zn acceptor states by O donor-like trap states. Photocurrents of Si-doped and Se-doped AlInP are less sensitive to the O contamination, and the behavior of these n-type samples suggests that multiple energy states can be associated with the O impurities and dopant atoms. The benchmarks have been used to identify O contamination in trimethyl indium and phosphine and to evaluate new growth systems. Application of the benchmark to growth of GaInP solar cells with AlInP window layers is also discussed.