伴随矩阵^＊A的性质

本进一步研究了n(>2)阶实方阵A与其伴随矩阵^*A之间的关系，从而得到了一系列的性质。     

环炉技术在空气污染研究中的应用

在空气污染研究中,各种毒物的检测方法,近年来得到了很大的发展。某些成分如降尘、飘尘、二氧化硫、一氧化碳、二氧化碳等的检测已经规范化,并且可以通过电子计算机组成“大气污染自动检测预报系统”。对于粉尘和重金属的污染测定,则多采用分光光度和原子吸收光谱法。另外,对环炉技术的应用也给予了较大的注意。这是因为环炉技术能应用于微克和毫微克范围的测定,而设备却非常简单,方法快速,从采样到测定一般可在30分钟内完成。全部仪器、试剂等设备可以装入一只手提箱带至生产车间     

强激光辐照下柱壳温度场的数值模拟

 用有限元方法数值模拟强激光辐照下柱壳上温度场的变化和分布情况，并对热性能参数随温度变化对温度场造成的影响进行了研究。     

H^p（D）函数的两个新刻划

证明了关于单位圆盘D上的H^p函数的两个新的等价命题。     

可加白高斯信道上软判决序贯译码的码元度量的估计

其中,n(t)为高斯白噪声,具有均值 E_n(t)=0和自相关函数 E_n(s)n(t)=(N_0)/2δ(t—s);N_0称为噪声 n(t)的单边功率谱密度,δ(τ)称为δ函数或单位脉冲函数.r_i(t)通过相干解调后得     

荧光光度法测定天然气中的微量硫

本文设计用铂催化氢解,荧光光度法测定天然气中的微量硫。在900℃温度下,氢气与样气比为10:1时,有机硫经铂催化氢解为硫化氢,以氢氧化钠溶液吸收后,再加入荧光素汞进行荧光光度测定,此法设备简单、操作方便、测量迅速,20分钟可完成一次分析,测量范围宽、灵敏度高,可准确测量0.02～1000ppm的硫,1ppm以下测定的相对误差不大于15％。     

物理题三则

1.两球平行地作无转动的直线运动,如图1,a所示。在某一时刻两球的表面相接触,如图1,σ所示。此时由于摩擦之故它们开始转动,情况如箭头所示。在接触以前两球的动量矩等于零,因为它们没有转动,因此在转动以前说系统的动量矩之和等于零。接触后两球按同一方向转动,(图1,σ)所以动量矩之和不再等于零,但这个结果违反了动量矩守恒定律。上面的叙述错误在那里? 2.一球从斜面滚下     

铝、铜、镍三元合金系中τ相的晶体结构变迁

A thorough investigation by means of X-rays has been carried out with the purpose to determine the nature of the ternary phase τ in Al-Cu-Ni alloys. In contrast with the conventional concept of alloy phase which is characterized by a definite type of crystal structure, systematic structure changes are found in the single phase field of τ which occupies quite an extensive area in the isothermal section of the phase diagram at room temperature. There are eight types of structures altogether, all derived from a basic rhombohedron with corners occupied by Al atoms and centres either occupied by the heavy atoms or remaining vacant. The basic rhombohedron is the building stone in the crystal architecture. By transforming the basic rhombohedron into a hexagonal prism in the usual way, all structures may be considered to be built up by stacking together a number of these hexagonal prisms along the triad. The transformation of one structure into another is quite systematic in the way that the number of the stacking stories in the unit cell increases according to the order 10, 11, 12, 13, 14, 15, 16, 17. The atomic arrangements in the different structures are closely related too, in the respect that they are all superstructures due to the presence of ordered vacancies in the rhombohedral centres.The principal factor controlling the formation of these structures has been fully considered. In view of the fact that the change of structure types follows closely with the content of Ni or Cu for alloys of constant Al content, the atomic size factor appears to be unimportant in the formation of these alloys. It has been shown that for alloy phases of the defect lattice type as the r-phase, the most fundamental factor is the average number of valency electrons per structural unit which is the basic rhombohedron in the present case. By assuming Hume-Rothery's valencies, the average number of valency electrons remains remarkably constant throughout the entire phase field, while the electron concentration varies with compositions. It has also been pointed out that for alloy phases where there is no unit cell change, the average number of electrons per structural unit is equivalent to the number of electrons per unit cell, and for alloy phase where there is no defect, this is in effect equivalent to the electron concentration.     

具有特殊电磁性能的有机物貭

大家知道,物体按其导电性能的不同,可以分成导体、絕緣休、半导体。按其磁性的不同則可分为鉄磁体、逆磁体、順磁体。对于多数的有机物质來讲,它們都是不导电的絕緣体和逆磁体、少部分的有机物质的电磁性能則与此相反,它們具有明显的半导体性能和一定的順磁性。对这部分有机物质的半导体性能的研究,早在本世紀初就已开始。但比較大量、系統、深