掺镁YFeO3固溶体的电导和气敏性能研究

用化学共沉淀法制备了复合氧化物ＹＦｅＯ３镁掺杂固溶体Ｙ１－ＭｇｘＦｅＯ３气敏半导体材料,并对其相组成、电导和气敏性能进行了研究。结果表明：Ｍｇ＾２＋在ＹＦｅＯ３的Ａ位固溶范围为０≤ｘ≤０．８;电导测量显示,该Ｐ型固溶材料电导突变较纯相ＹＦｅＯ３低１００℃以上;９００℃以下灼烧４ｈ所得的Ｙ０．９４Ｍｇ０．０６ＦｅＯ３粉料制作的元件在２５７℃时对乙醇灵敏度最高,对４．５μｍｏｌ／Ｌ乙醇的灵敏度高达４４     

The Detection of Defects in Optical Fibers Using a Hybrid Opto-electronic Correlator

A hybrid opto-electronic correlator for detecting defects in optical fibers is proposed. After the light from a He-Ne laser being expanded and filtered it is not collimated but directly passes a Fourier transform lens and illuminates a reference fiber and a test fiber at the same input plane. The Fourier transform spectrum of the two fibers is therefore obtained at the rear focal plane of the lens, where it is sampled via a CCD array connected with a computer through a frame grabber. The computer performs filter, inverse Fourier transform and setting threshold operation on classification. The system is an equivalent of joint transform correlator with a Fourier lens of long focal length. The experiment results for optical fibers having incoordinate defects are presented. The results indicate that the system can be used for fiber defect detection, and has the advantages of high identification, compact configuration, easy adjustment and flexible manipulation.     

C60醛类衍生物非线性光学特性研究

研究了加合不同取代基团的C60醛类衍生物的光学非线性性质。利用简并四波混频（DFMW）方法获得了C60醛类各衍生物的三阶光学非线性超级化率γ^(3)及相应的三阶光学非线性系数χ^(3)值。同时也研究了它们各自的光限幅特性。结果表明：不同的取代基对C60醛类衍生物三阶光学非线性及光限幅特性的影响不同。     

A Generalized Quasilinearization Method for Nonlinear Second-Order Impulsive Differential Equations Involving the <Emphasis Type="Italic">p</Emphasis>-Laplacian

Using variational method and lower and upper solutions, we get a generalized quasilinearization method which construct an iterative scheme converging uniformly to a solution of a nonlinear second-order impulsive differential equations involving the p-Laplacian, and converging quadratically when p=2.     

火焰原子吸收光谱法测定茶叶中的钾、钠、铷

本文报道了空气－乙炔火焰原子吸收光谱法测定茶叶中钾,钠,铷的含量。茶叶采用硝酸消解,方法简单,快速,回收率为９９．９％－１０５．２％,相对标准偏差为２．７８％－８．９６％。     

偶奇q相干态的振幅k次方(k>3)压缩性质

研究结果表明,只有当以k>3)为奇数时,偶q相干态呈现振幅k次方压缩性质;无论k为偶数还是奇数,奇q相干态均不呈现压缩性质。     

U(1) symmetry in the current algebra and N-fermionic massless Thirring model

Local U(1) symmetry in current algebra constructed by fermions has been found. The symmetry is related to the simplest q-deformation of N-fermions. We give the physical interpretation through the N-fermionic massless Thirring model. The Bethe ansatz wavefunction is also given.     

细胞培养基的吸收光谱研究

使用日本岛津UV 310 1分光光度计分别测量培养了宫颈癌细胞 (Hela)和鼻咽癌细胞 (CNE)的RP MI 16 4 0培养基和DMEM高糖培养基的紫外吸收光谱 ,分析了培养基中蛋白质的紫外吸收特性。RPMI16 4 0培养基的 2 2 7nm吸收峰在培养细胞生长过程中位移至 2 2 2或 2 18nm ,2 78nm的吸收峰位移至 2 80nm ;而DMEM高糖培养基 2 2 4nm吸收峰在培养细胞生长过程中位移至 2 2 1nm附近 ,2 78nm吸收峰基本没有位移。这些位移说明培养基中芳香族氨基酸中各种氨基酸如色氨酸和酪氨酸的含量有变化。也就是说 ,癌细胞在生长过程中对色氨酸和酪氨酸的消耗不是按等量比的。实验也说明Hela和CNE在生长过程中 ,对RPMI 16 4 0培养基和DMEM高糖培养基中氨基酸的消耗是不同的。实验结果为癌细胞生长过程中所需培养基中氨基酸的含量提供了依据     

混合物质高压状态方程的计算

 介绍了在温度相同的条件下,混合物中各组元通过密度-压强迭代法,达到温度和压强平衡,再结合叠加原理,编程计算出混合物质状态方程。为验证该程序,对氘氚与氩按不同比例混合时的状态参量进行了分析。当氘氚中含少量氩时,计算得到的状态方程与纯氘氚符合较好;同样地,氩中含少量氘氚时的状态方程也与纯氩的很接近。这说明该程序是可行的。     

外腔反馈对半导体激光器振荡特性的影响

通过有效反射系数的引入，根据激光谐振腔的自再现条件和对腔内光子密度、载流子密度方程的求解，分析了外腔反馈对半导体激光器的阈值增益、振荡频率和输出功率等振荡特性的影响，并通过实验进行了验证.外腔反馈后，半导体激光器的阈值电流从420mA降为370mA，输出功率的斜率效率获得了提高，理论计算的输出功率曲线与实验结果符合的很好. 关键词： 半导体激光器 外腔反馈 振荡特性