参态逻辑

提出参态逻辑,给出它的语言、语义和公理系统,并给出参态逻辑的完全性定理,论证了参态逻辑具有足够丰富的形式能力,可表达很大一类逻辑而作为其特殊形式.     

多光子电离谱的微机控制

本文报道了测量多光子电离谱的一整套硬件和软件系统。自行设计实现了将计算机、激光器及Ｂｏｘｃａｒ连接起来的自动控制系统。这一系统大大改善了实验条件，提高了信噪比及仪器的分辨率。所得的实验结果，未曾见报道。     

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.     

PULSED LASER DEPOSITION AND CHARACTERIZATION OF FERHOELECTHIC Pb(Zr, Ti)O3 THIN FILMS ON SILICON-ON-INSULATOR SUBSTRATES

Ferroelectric Pb(Zr, Ti)O₃ thin films were prepared by pulsed exeimer laser deposition on silicon-on-insulator and Pt-coated silicon-on-insulator substrates, and rapid thermal annealing was per-formed to crystallize the films, Based on the analysis by X-ray diffraction, Rutherford backscattering spectroscopy and measurements of electrical properties, the films were revealed to be polycrystalline perovskite structure with mainly (100) and (110) orientations, and their crystallization was found to be dependent on annealing temperature and annealing time. The films show good ferroelectricity, with P_r=15μC/cm², E_c= 50kV/cm, high resistivity and high dielectric constant.     

Structure of BaGd2（MoO4）4 Crystal

The title compound belongs to monoclinic,space group C2/c with a=5.2694(1),b=12.6659(4),c=19.4108(2) ,β=91.504(2)°,V=1295.06(5) 3,Z=4 and Dc=5.599 g/cm3. The structure of BaGd2(MoO4)4 contains a MoO4 tetrahedron,a distorted GdO8 polyhedron,and Ba2+ ions in a tenfold coordination. The GdO8 polyhedra are linked together through edge-sharing to give a two-dimensional Gd layer. The MoO4 tetrahedra connected to the Gd atoms are capped up and down the Gd layer through common oxygen apices,thus forming a new Gd-Mo layer. Finally,the Gd-Mo layers are held together through bridging BaO10 polyhedra to form a three-dimensional framework. Since the Ba-μ3-O bond has a large average distance of 2.888 ,this structural characteristic will result in a cleavage along the (001) plane.     

激光加速电子束团的输出特性研究

通过仔细研究俘获加速CAS(captureandaccelerationscenario)机制中电子束团的输出特性,发现其出射电子有3类不同的运动轨道即掠过(pass-by)、非弹性散射(IS)、CAS.由于实际入射电子束团的线度远大于强激光脉冲的线度,因此只有位于入射电子束团中心区域的电子才可能被俘获加速.对于目前所能获得的聚焦激光场强(～10²¹W/cm²)和实际的电子束团(～10⁸个电子)而言,最大的输出能量可达到450MeV以上,同时被加速电子的数目可达到10⁴—10⁵个.这表明CAS可望发展成为小型台式加速器的新加速原理     

基于模糊综合评价方法的机场油库安全度评估研究

将模糊综合评价方法应用于机场油库安全度评价,设计了四级评价因素集,结合机场油库实际,给出了安全度模糊综合评价的数学模型和计算方法.通过对某机场油库实例计算表明,评价结果与实际一致.该方法为机场油库安全管理提供了科学依据.     

Preparation of Ferrierite Zeolite Membranes in the Absence of Organic Structure-directing Agents

Zeolite membrane is an important category of inorganic membranes with many advantages such as thermal and chemical stability, high mechanical strength as well as the unique pore structure of molecular dimension. Up to now, many types of zeolite including …     

运用因子分析法综合评价广东烟草工业经济效益

正确运用因子分析与SPSS统计软件,对广东省内7所卷烟工业企业的经济效益进行定量定性综合评价.其结论有一定的参考价值.     

基于SMES的超导电力集成研究超导限流贮能系统

本文探讨了基于SMES的超导电力集成的基本概念,分析了集成设计的基本原理.提出了一个基于SMES的超导电力集成应用实例:一种用于配电系统变电站应用的桥路型超导限流贮能系统(SFCL-MES),它既可以限制故障电流峰值和稳态值,也可以同时补偿系统电压,保证系统供电质量.讨论它的结构和集成原理,仿真试验验证了它的有效性.