On a Class of Additive Functions

ＯｎａＣｌａｓｓｏｆＡｄｄｉｔｉｖｅＦｕｎｃｔｉｏｎｓＺｈａｉｗｅｎｇｕａｎｇ（翟文广）（Ｄｅｐｔ．ｏｆＭａｔｈ．，ＳｈａｎｄｏｎｇＵｎｉｖ．，Ｊｉｎａｎ，Ｓｈｏｎｄｏｎｇ，２５０１Ｏ０）ＣｏｍｍｕｎｉｃａｔｅｄｂｙＰａｎＣｈｅｎｇｂｉａｏＲｅｃｅｉ...     

RELAXATION DYNAMICS OF PHOTOINDUCED EXCITON BLEACHING IN POLYMERS

Presented in this paper are systematic studies of photoiuduced exciton bleaching dynamics in the polymers with nondegenerate ground state, such as polydiacetylene, polythiophene and polyaniline. From a three-level model, the photoexcitation and relaxation of the exciton bleaching in the polymers are simulated. The results show that the exciton bleaching decay is composed of two components, the fast component and the slow component. For the fast component, the speed of exciton bleaching decay depends on the way in which the excitons relax. When the relaxation of the exciton to the ground state is dominant, the polymers exhibit an ultrafast initial bleaching relaxation; when the relaxation of the exciton to the self-trapped exciton state is dominant, the polymers exhibit a slower initial bleaching relaxation than that in the former case, For the slow component, the exciton bleaching decay is due to the relaxation of the self-trapped excitons to the ground state. Using femtosecond time-resolved pump-probe technology, we measured the relaxation dynamics of the photoinduced exciton bleaching in the emeraldine base form of polyaniline. Fitting the experimental data to the theoretical model indicates that the fast component arises from the relaxation of excitons to the ground state (～100fs) and the slow component arises from the relaxation of self-trapped excitons to the ground state (～30 ps).     

A CLASS OF SECOND ORDER FUNCTIONAL DIFFERENTIAL INEQUALITIES

ＡＣＬＡＳＳＯＦＳＥＣＯＮＤＯＲＤＥＲＦＵＮＣＴＩＯＮＡＬＤＩＦＦＥＲＥＮＴＩＡＬＩＮＥＱＵＡＬＩＴＩＥＳ￥ＺｈａｎｇＬｉｑｉｎ（张立琴）；ＦｕＸｉｌｉｎ（傅希林）（ＳｈａｎｄｏｎｇＮｏｒｍａｌＵｎｉｖｅｒｓｉｔｙ，山东师范大学，邮编：２５００１４）...     

具连续分布滞量的非线性双曲偏微分方程解的振动准则

该文研究一类具连续分布滞量的非线性中立型双曲偏泛函微分方程解的振动性质。建立了两类双曲边值问题解振动的若干判别准则．     

TYPES AND CRITERIA OF NONOSCILLATORY SOLUTIONS FOR A CLASS OF SECOND ORDER NEUTRAL FUNCTIONAL DIFFERENTIAL EQUATIONS WITH NONPOSITIVE COEFFICIENTS

In this paper we discuss the types and criteria of nonoscillatory solutions for the fol-lowing second order neutral functional differential equation with nonpositive coefficients     

ON BOUNDEDNESS OF SOLUTIONS OFIMPULSIVE INTEGRO-DIFFERENTIAL SYSTEMSWITH FIXED MOMENTS OF IMPULSE EFFECTS

1Introduction.ImpulsivesystemshaveagreatdealOfapplicationsinphysics,biology,medecineandotherssciences.Thetheoryforimpulsivedmerentialsystemshasbeendevelopedstronglytforinstancesee[1-3].Butthetheoryoftheimpulsiveintegrthdifferentialsystemsisasyetnotwell-developed.WeonlyisknownthatthecomparisonresultsforstabilityOfthesolutionsofimpulsiveintegro-dmerentialsystemshavebeenobtainedin[4].ConcerningtheboundednessOfimpulsiveintegro-dmerentialsystems,therehasnotappearedtobeanyresultssofar.Theobjective…     

电热原子吸收悬浊液进样法测定煤飞灰中的铅

本文利用生物胶作为稳定剂和基体改进剂，把难溶剂环境固体样品制备成悬浊液，直接进行测定煤飞灰中的铅，得到了准确的结果。找出了日立１８０－８０石墨炉子原子吸收光谱仪的最佳线性范围７．０～６６．７ｎｇ／ｍＬ，原子化适宜温度２０００℃，生物胶量最佳用量范围０．２～１．２‰，并分析了酸度，搅拌，粒度对测定结果的影响。     

阴极射线激发下ZnO薄膜室温紫外发光的超线性增长规律

研究了直接溅射ＺｎＯ薄膜在阴极射线激发下紫外光（约３９０ｎｍ）和绿光（约５２０ｎｍ）的发光与激发电子束电流密度的关系。随激发电流密度增加绿光相对下降，紫外光相对增强，使得ＺｎＯ薄膜的发光颜色从绿变蓝紫，ＺｎＯ薄膜绿光随电子束流密度的增长呈亚线性增长，并在不高的束流密度下达到饱和，而紫外发光随电子束流密度呈超线性增长，这是ＺｎＯ薄膜在室温阴极射线激发下紫外受激发光的迹象，是高密度激发下的一种超辐射受     

脉冲摄动微分系统的有界性

通过利用变分Lyapunov函数方法, 该文主要研究了脉冲摄动微分系统关于两个测度的有界性. 与以前结果相比, 不难发现变分Lyapunov函数方法是Lyapunov函数方法的推广 .     

关于(a,a,b)类型的三维除数问题

本文研究了(a,a,b)类型的三维除数问题.当a＜b≤2a时,我们利用指数和的新估计得到了余项△(a,a,b;x)的较好估计.