半导体物理中的一个两点边值问题

本文研究了在半导体流的区域提纯过程中提出的两点边值问题解的存在性，我们用上、下解方法和Ｓｓｈａｕｄｅｒ不动点定理证明了如果Ｑ＝２Ａ３Ｒｅ，其中Ａ是表面速率，Ｒｅ是Ｒｅｙｎｏｌｄｓ数，则当０ Ｑ １２．６８时，该问题有解． 对［１］的结果（０ Ｑ＜８．５１时，此问题的解存在）进行了重要的改进．     

Enantiomeric Sesquiterpene Lactones from Senecio tsoongianus

From Senecio tsoongianus,two pairs of enantiomeric isomers,tsoongianolides A(1) and B(2),tsoongianolides C (3) and D(4) were isolated. Their structures were elucidated by 1D and 2D-NMR techniques and X-ray diffractions. The cytotoxicity to KB cell of 1 and 2 is also reported.     

企业经营者股票期权薪酬机制的模型探讨

采用 Black-Scholes期权定价理论 ,建立了激励机制下企业经营者股票期权薪酬机制的分析、操作模型     

一维连续时间Markov分枝过程的密度演化方程

本文通过建立密度演化方程 ,将一维连续时间Markov分枝过程问题转化为确定性的方法来研究 ,用C0 半群理论证明了密度解的存在性和唯一性 ,并介绍了求密度解及其母函数表达式的方法 ,得到了一些有益的结果     

Synthesis, Structure and Characterization of Manganese（ Ⅱ ） Coordination Polymer with Camphoric Acid and 1, 10-Phenanthroline

IntroductionThe syntheses of metal-organic coordination poly-mers have been attracting increasing attention owing tothe potential applications of their functional materials incatalysis,non-linear optics,magnetism sensors andmolecular recognition[1—7].Coordination polymers crys-tallized from polyaromatic acids and metal-ions are ofgreat interest for their polymeric structures and porousproperties[8—12].Their network topologies based on mo-lecular building blocks are usually controlled and mod…     

Uniphase1007型He—Ne激光管的纵向塞曼稳频研究

本文介绍采用拍频曲线晶振基准法首次在Uniphase 1007型长寿命商品He-Ne激光管上实现了无压电陶瓷调谐元件的塞曼双频稳频,采用可调永磁供磁,达到光频长期漂移5×10~(-9);双频双线偏振分离度1/60;双线偏振正交度89.5°;入锁及锁定情况良好.给出了塞曼双频激光器的调试技术.描述了输出光束偏振状态和纵模数关系的一个物理现象.     

P. Turán问题26的解

给出了基于n次Chebyshev多项式零点的Gauss型Hermite求积公式中Cotes数的明显表达式及其当n→∞时的渐近性质.此即给出了P.Turan问题26的解.     

FORMATION OF A BURIED LAYER OF ALUMINIUM NITRIDE BY HIGH DOSE N2+ IMPLANTATION INTO ALUMINIUM

Aluminium films with various thickness between 700 nm and 1μm were deposited on Si (100) substrates, and 400 keV N₂⁺ ions with doses ranging from 4.3×10¹⁷ to 1.8×10¹⁸ N/cm² were implanted into the alu-minium films on silicon, Rutherford Backscattering (RBS) and channeling, secondary ion mass spectroscopy (SIMS), Fourier transform infrared spectra (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM) and spreading resistance probes (SRP) were used to characterize the synthesized aluminium nitride. The experiments showed that when the implantation dose was higher than a critical dose N_c, a buried stoichiometric AlN layer with high resistance was formed, while no apparent AlN XRD peaks in the as-implanted samples were observed; however, there was a strong AlN(100) diffraction peak appearing after annealing at 500 ℃ for 1h. The computer program, Implantation of Reactive Ions into Silicon (IRIS), has been modified and used to simulate the formation of the buried AlN layer as N₂⁺ is implanted into aluminium. We find a good agreement between experimental measurements and IRIS simulation.     

液体除湿空调再生性能的实验研究

在对液体除湿和再生机理研究的基础上,建立了太阳能液体除湿空调系统,其中的再生器采用逆流式填料塔,塔体采用不锈钢材质,有效克服了除湿溶液对它们的腐蚀。本实验采用氯化钙作为除湿剂重点研究了再生过程,分析了各种进口参数对再生效果的影响。结果表明:空气流量和含湿量以及除湿溶液的流量和再生温度对再生过程的传热和传质有不同程度的影响。     

Coefficient multipliers of mixed norm space in the ball Dedicated to Professor Sheng GONG on the occasion of his 75th birthday

In the paper, we characterize the coefficient multiplier spaces of mixed norm spaces (Hp,q((?)1),Hu,v((?)2)) for the values of p, q, u, v in three cases: (i)0相似文献