高压H2受激喇曼散射的阈值与能量转换效

我们着重研究了高压H₂气Q(1)振动跃迁(4155cm^-1)受激喇曼散射(SRS)中,参与非线性相互作用的几个参数(介质分子密度、跃迁线宽、泵浦光子密度以及非线性作用长度)对受激阈值与能量转换效率的影响。给出了自零到24atmH₂气压范围内阈值随H₂气压变化的实验结果,它与根据Dicke-Doppler展宽和碰撞展宽的联合效应的分析是一致的。讨论了由于受激喇曼过程(SRP)和四波混频参量过程(FWPP)共同影响下能量转换效率、压力-色散效应对高阶反斯托克斯的能量输出的重要影响。 关键词：     

Folded Solitary Waves and Foldons in(2+1) Dimensions

A general type of localized excitations, folded solitary waves and foldons, is defined and studied bothanalytically and graphically. The folded solitary waves and foldons may be “folded“ in quite complicated ways andpossess quite rich structures and abundant interaction properties. The folded phenomenon is quite universal in the realnatural world. The folded solitary waves and foldons are obtained from a quite universal formula and the universalformula is valid for some quite universal (2 1)-dimensional physical models. The “universal“ formula is also extendedto a more general form with many more independent arbitrary functions.     

推广的Boussinesq方程和KdV方程——Painlevé性质,Bcklund变换和Lax对

本文从Kadomtsev-Petviashvili方程的对称性约化出发,得到了具有任意函数作为变系数的推广的Boussinesq方程和推广的KdV方程.利用Weiss和Kruskal等建立的奇性分析方法,我们证明了这两个方程可积的充分条件:Painlevé性质。得到了这两个方程的Bcklund变换和奇性流形方程(推广的Schwartz-Boussinesq方程和Schwartz-KdV方程)。并由此将这两个方程线性化,即给出这两个方程的Lax对并包含有明显的与时间无关的任意谱参数。     

A Facile Route to Unsymmetrical Sulfide

Unsymmetrical sulfides can be generated by the reaction of chlorine substituted aromatic compounds in sulfoxide in the presence of fluorine anion in fair yield.A likely mechanism was proposed.     

A Styrylpyrone Dimer from the Bark of Goniothalamus leiocarpus

A dimer of styrylpyrone derivative, leiocarpin E(1), was isolated from the bark of Goniothalamus leiocarpus. Its structures was elucidated by means of spectral and chemical methods. The cytotoxicity of leiocarpin E against HL-60 cells was tested.     

它莫西芬诱导乳腺癌MCF-7细胞自噬的比较蛋白质组学研究

自噬(autophagy)广泛存在于真核细胞,贯穿于正常细胞生长发育和生理病理过程.自噬功能的变化与疾病密切相关.     

NO在Sm2—xSrxNiO4上的催化还原

在具有Ｋ２ＮｉＦ４型结构的Ｓｍ２－ｘＳｒｘＮｉＯ４（ｘ＝０．４，０．５，０．６，０．８，１．０，１．２，１．４，１．５）化合物上进行了ＣＯ催化还原ＮＯ的研究。结果表明，低温、低Ｓｒ＾２＋取借代量与高温、高Ｓｒ＾２＋取代量的反应途径不同，这可从化合物的结构、化合物中金属－氧键的标准生成焓的总和、ＮＯ还原的表现活化能及化合物上Ｏ２的脱附行为等得到解释。     

流化床中高分散镍基催化剂上甲烷的自热重整和部分氧化

Highly dispersed Ni catalysts on spherical SiO2 were prepared by simple impregnation of Ni（acac）2, [Ni-（NH3）6-n（H2O）n]^2＋, [Ni（en）3]^2＋ and [Ni（EDTA）]^2-. Pulse adsorption of H2 and TEM analysis results confirmed that Ni was dispersed very well on the surface of SiO2 even after calcination （4 h） and reduction （1 h） at high temperature of 800 ℃. These highly dispersed and uniquely sized Ni crystallites were more stable and more reactive for both autothermal reforming and partial oxidation of methane in fluidized reactor.     

学习干预下中学化学教师学习共同体研修活动的准实验研究

在化学教师网络研修过程中开展准实验研究，从学习干预的角度对化学教师的网络学习过程进行主动影响和介入，以实现教师个人知识的建构与提升。在构建学习活动分析模型基础上，选择3次典型研修活动进行统计分析，发现在化学教师网络研修过程中应进行设计干预，鼓励并提高行动者的声望和中心性，以提升学习共同体中研修成员的参与度，促进不同层面成员学习能力的发展。     

甲壳素/壳聚糖在环境治理上的应用

天然高分子化合物甲壳素、壳聚糖具有原料丰富、无毒、易于生物降解等优点,国内外众多学者对它的开发应用展开研究,本文综述了甲壳素、壳聚糖及其衍生物对环境污染物的去除,介绍了它在环境治理尤其是废水处理中的研究和应用情况。