数字声呐三波束多目标跟踪方法

本文介绍数字声响三波束多目标跟踪方法，这个方法非常容易在回（往）阵数字多波束声呐中应用，通过试验说明其跟踪性能可与数字多波束检测性能相一致，并对其工程应用做了一些讨论．     

A DOUBLE-TEMPERATURE-GRADIENT TECHNIQUE FOR THE GROWTH OF PURE C60 SINGLE CRYSTALS FROM THE VAPOR PHASE

Pure C₆₀ single crystals were grown by a sublimation-condensation method in an evacuated dosed quartz tube situated in a double-temperature-gradient furnace. Large C₆₀ single crystals, up to a size of 0.6 mm×1.0 mm×2.0 mm with quite smooth and shiny faces, were obtained. X-ray diffraction, electron diffraction and X-ray morphology were carried out and showed that the quality of large C₆₀ single crystals grown by the double-temperature-gradient technique is excellent. In this paper the experimental results of the growth of large C₆₀ single crystals are reported and the morphological and structural characterizations are discussed in detail.     

流动注射—溶剂萃取—原子吸收光谱法测定微量锰（Ⅱ）

本文研究了一种新的在线流动注射－溶剂萃取预富集－原子吸收光谱分析方法。它具有原理简单，萃取装置，萃取效率高，易操作等特点，经对地表水，人发和中草药中Ｍｎ（Ⅱ）进行在线ＦＩＡ－ＥＸＴ－ＡＡＳ分析得到比较好的结果。方法检出限为０．０７６μｇ．ｍｌ＾－１，ＲＳＤ１．０２％线性范围０．５－５．０μｇｍ．ｍｌ＾－１回收率９４－１０２％。     

二元光学元件的衍射效率及其振幅矢量解法

本文用振幅矢量作图法来分析衍射问题，推导出＋１级衍射效率公式，物理图象清晰、直观。     

任意回转流面上跨音速压气机叶栅含激波流场的计算

本文运用时间分裂有限体积法,进行了任意回转流面上跨音速压气机叶栅含激波流场的计算。分析了MacCormack显式两步差分格式中的几种不同运算形式,提出了对于叶栅绕流计算问题的合适的运算方案。对几种边界条件的处理方法进行了数值试验和分析比较。流场计算中采用了一种周向非等距网格,这将有助于缩短计算时间。     

THE DIFFRACTION OF NORMALLY INCIDENT SAW BY ACOUSTIC GRATING

The diffraction phenomena of SAW normally incident on acoustic gratings have been developed.The acoustic grating which is composed of a periodic array of metal film stripes is fabricated on thesurface of Y-cut LiNbO_3 on which the SAWs propagate. Theoretically,the diffraction characteristics of the gratings on which the SAW beam normallyimpinges are analyzed by means of the phenomenological theory.The emphases are laid on twospecial cases,i.e."thin grating"and"thick grating"situations.For the former,the Raman-Nathapproximation is quoted from the theory of acousto-optical diffraction.For the latter,the analyticalexpressions of the diffracted intensities are deduced by using the normal mode theory. Experimentally,two sorts of samples which correspond respectively to"thick grating"and"thingrating"are designed and fabricated.Some interesting results are obtained by means of the opticalmethods.The images of the SAWs power flows of the diffracted acoustic fields as well as the SAWwavefronts within the grating     

二甲亚砜硝酸钇的晶体结构

二甲亚砜硝酸钇Y(NO₃)₃·3DMSO晶体属单斜晶系,a=13.604(4)?,b=12.669(4)?, c=11.554(2)?, β=100.14(4)°,z=4。空间群为P2₁/n。用PW-1100四圆衍射仪收集强度数据,独立衍射点数为3615个。结构已用重原子法解出,用全矩阵和方块对角矩阵最小二乘方法修正结构参数,最后R因子为0.080。结构分析结果表明,围绕着钇离子的九个氧构成稍歪扭的“三帽三方棱柱”配位多面体。钇和配位氧之间 关键词：     

质子探针在流体包裹体分析中的应用

本文着重阐述了质子探针无标样定量分析流体包裹体的方法原理、技术要点和分析时注意的问题。作者对我国斑岩铜矿石英中的流体包裹体进行了分析,还就国内外质子探针分析流体包裹体的现状进行了评述和展望。     

微微秒叶绿素染料激光器的研究

本文报道用一台对撞脉冲锁模Nd:YAG激光器的三倍频光作为泵浦光源,采用超短腔结构,获得叶绿素的红色ps脉冲激光输出的装置和实验结果。研究了叶绿素a和b在各种聚合状态下输出激光波长随染料浓度的变化关系,当叶绿素a-乙醇溶液浓度为2×10~(-3)M,激光腔长<36μm时可获得单模调谐ps系列脉冲输出,激光束的发散角≈60mrad。     

∑关系线性理论的应用(Ⅱ)——∑_7关系的应用问题

本文根据“Σ关系线性理论”的原则,提出了可行的Σ_7关系运算方案。用五个不同类型的已知结构进行了验证。文中对Σ_7和Σ_3关系作了比较,并讨论了这一类关系式的实际应用价值。