Q spaces and Morrey spaces

We characterize functions in Morrey space by p-Carleson measures. We then reveal a simple relation between Q space and Morrey space, that is Q space can be viewed as a fractional integration of the Morrey space. Therefore, many results for Morrey space can be translated onto Q space. For example, we show that Q space is a dual space by identifying its predual.     

Endpoint estimates for certain commutators of fractional and singular integrals

In this paper, the authors obtain the endpoint estimates for a class of non-standard commutators with higher order remainders and their variants. Moreover, the authors show that these operators are actually not bounded in certain cases.

     

Average values of symmetric square -functions at the edge of the critical strip

Let be the set of all normalized newforms of weight 2 and level , and let be the symmetric square -function associated to . If is a prime, then there is a positive constant such that

This improves a recent result of Akbary, which requires in place of .

     

Noetherian PI Hopf algebras are Gorenstein

We prove that every noetherian affine PI Hopf algebra has finite injective dimension, which answers a question of Brown (1998).

     

EQUIVALENCE OF SOME METHODS ON FUZZY REASONING

In this paper, we get several equivalent conditions of some methods on multidimensional (multicon-ditional) fuzzy reasoning.     

北京自由电子激光最近进展──实现饱和振荡

北京自由电子激光(BFEL)装置于1993年底在10.68μm处实现了饱和振荡.输出激光能量为3mJ,饱和平顶宽度2μs.对应饱和振荡平均功率为210kW(宏脉冲),峰值功率约为20MW,比自发辐射高8个量级,单程小讯号净增益为24%,转换效率为0.45%,与理论预期结果相符.光束质量接近衍射极限.目前装置可工作于9-11μm.     

Eu3+、Tb3+与1-乙酰乙酰吲哚、1,10-邻菲啰啉二元、三元体系在溶液中荧光光谱研究

观察了以不同比例溶解在乙醇中的Eu3+、Tb3+、1-乙酰乙酰吲哚(HL)和1,10-邻菲啉(Phen)的荧光光谱.结果表明HL能有效地把吸收的能量传递给Tb3+,而不能有效地传递给Eu3+.讨论了HL和Phen对Eu3+、Tb3+的配位作用及其对Eu3+或Tb3+所组成的三元体系中敏化发光性能的影响.     

紫外光对MCP增益特性测量的影响

介绍用ＵＶ光电法测量ＭＣＰ电子增益时，ＵＶ透过金薄膜的附加输出给测量带来的影响，给出了实验结果并进行初步分析，最后指出确保增益测量结果可靠性的途径。     

利用不完全自锁模激光研究C60的反饱和吸收效应

本文报道首次采用色心晶体的不完全自锁模激光（１０６４ｎｍ）对Ｃ６０分子反饱和吸收效应的研究，实验结果与采用平均过程的研究方法是一致的，文中还讨论了Ｃ６０分子反饱和吸收效应产生的原因。     

超声雾化法制取金属粉末方法研究

本文介绍了利用超声振动能量制取超细金属粉末的超声雾化方法，提出了超声制粉雾化室，等离子枪，阴极、阳极喷咀及换能器振动系统的最佳尺寸和工作参数，给出了实验结果及制得的粉末显微结构照片．实验结果表明，用本文所述方法制得的金属粉末组成为：－80目粉占84呢，－120目粉占63．7啪，而用PREP方法制得的粉末分别占19．5％和11．7％，由此看来，用本方法制取超细金属粉，在粒度组成方面优于PREP方法．文中还对粉末冷却速度做了估算，得到了粉末平均冷却速度大于1×10_5k/5