绿辉石固溶体NaAlSi2O6-CaMgSi2O6的合成和高压下熔化过程研究

在2×10⁹～5×10⁹Pa,1 000～2 300℃下合成了由二元组分NaAlSi₂O₆(Jadeit)-CaMgSi₂O₆(Diopside)构成的绿辉石,通过XRD分析数据计算了绿辉石Jd_xDi_1-x的晶胞参数随组成变化的规律.采用高温高压淬火法和XRD研究了Jd_xDi_1-x(x=0～1.0)高压下(2×10⁹～5×10⁹ Pa)的固溶关系,并根据Jd_xDi_1-x的固溶相图计算了不同压力下的熔化热.     

奇异积分算子在 H~1(R_+~2×R_+~2)上的有界性

本文用 H~1(R_+~2×R_+~2)函数原子分解的方法,证明由 R.Fefferman 及 E.M.Stein 在[1]、[2]中引进的乘积空间上的奇异积分算子,当核函数 K(x_1,x_2)满足的条件中的 η>1/2时,在 H~2(R_+~2×R_+~2)上是有界的.即存在与 f 无关的常数 C,使‖K*f‖_H~1≤C‖f‖_(H~1).     

轴流式叶栅完全反问题工程解

对于轴流式叶轮机械叶栅的完全反问题——规定叶栅前后气流参数及叶片表面速度分布而设计叶栅,本文发展了吴仲华教授创立的中心流线法,得出了一个程序非常简单、计算非常快捷的工程解法。文中对初值选定、迭代修正、光滑措施与决定稠度等均作了讨论,给出了可用的办法;而且还论述了本法的适用范围。已用此法作了一些低跨声速平面叶栅设计的试算,说明本法是有效的,可以用袖珍计算机进行编程设计。此法可以推广应用于设计任意迴转流面上有熵增、跨声速、无强激波的轴流式、混流式和径流式叶轮机械的叶栅。     

A COMPUTER MODEL FOR PREDICTING NOISE LEVELS FROM A COMPLEX VEHICLE STREAM ON A MULTI-LANE ROAD WITH SOME VEHICLE BUNCHES

In this article,a simple computer simulation method for synthetically predicting noise levels froma random complex traffic stream on a multi-lane road is presented.The probability distributionfunction,probability density function and the expectation of successive headways of a computer model(M_2 model)Which can simulate complex traffic stream with some vehicle bunches are derived in details.The transformation formula producing the random numbers that obey this distribution is also derived.Then,the simulation flow chart is given.A comparison among some simulation results based onM_2 model and M_1 model(exponential distribution model)is made.Corresponding computer programis worked out according to standard method of measurement regulation of road traffic noise in China.Provided that some parameters,such as traffic volume,traffic component and the distances betweenobserver and equivalent lane and every lane are fed into computer,the noise levels L_(10),L_(50),and L_A,eqwill be printed out.Calculations show     

2p4n) 126Ba at the beam energy of 73 MeV. Lifetimes of the states around the

通过束流能量为７３ＭｅＶ的１１６（１６Ｏ，２ｐ４ｎ）１２６Ｂａ反应布居１２６Ｂａ的高自旋态，利用多普勒移动衰减法测量了转晕带回弯区的能级寿命，相应的归一化崳拢ǎ牛玻┲翟冢保埃停保玻飨越档停笛榻峁肓Ｗ右蛔幽Ｐ偷睦砺墼ぱ宰髁吮冉稀Ｊ笛椋拢ǎ牛玻┲档陀诶砺壑怠关键词     

157Yb的形状共存研究

利用在束γ谱学方法,通过反应¹⁴⁴Sm(¹⁶O,3n)¹⁵⁷Yb研究了¹⁵⁷Yb的激发态能级结构.实验中使用的¹⁶O束流能量为90MeV.基于实验得到的γγ符合关系、γ射线的各向异性度和DCO系数,建议了¹⁵⁷Yb的高自旋能级纲图.¹⁵⁷Yb的能级纲图主要由两串跃迁性质明显不同的级联能级组成,它们分别对应于νi_13/2转动带和单粒子激发态.着重讨论了¹⁵⁷Yb的形状共存和νi_13/2转动带随角动量的结构演化.     

完全气体一元变截面不定常带激波流动的一套显式解析解

本文绘出了可压缩完全气体一元变截面不定常带撤波流动的一套代数显式解析解。据作者所知此解是不定常带激波流的第一个显式解析解。此解除在理论上有其重要意义外，还可以用来作为检验各种数值解及研究各种数值解法之用，也有重大实用价值。     

一种简单的显微物镜波面像差测定干涉仪

提出一种结构简单的显微物镜波面像差测定干涉仪。该仪器可以测定各种倍率物镜轴上、轴外多种波长的波面像差等光学性能参数。并分析了仪器的系统误差。     

A COMPUTER MODEL FOR PREDICTING THE EFFECTS OF MOTOR VEHICLE NOISE ON BUILDINGS ADJACENT TO URBAN STREETS

Based on the principles of geometrical acoustics and the superposition of important early reflectedsound energy on direct sound energy,a computer model which considers the containment effects asso-ciated with basically unbroken facades parallel and adjacent to a street is given in this paper.Theformulae deciding the orders of important early reflected sound rays which are dependent on the heightsof buildings and the distances between facades and lanes are derived.The early reflected sound ray'slengths are also decided.This paper also gives another computer simulation method,having the aidof scale map of street and nearby buildings,which can be used for predicting the noise levels of penetra-tion through a gap between rows of houses perpendicular to the street.