Mo2C膜表面高度和高差分布规律研究

介绍了金属有机气相沉积（ＭＯＣＶＤ）制备Ｍｏ２Ｃ功能膜的过程和对膜表面粗糙度的测量结果;在测量基础上进行统计,找出Ｍｏ２Ｃ膜表面高度和高差分布规律;将ＤＴ２模型推广,进行２＋１维计算机模拟,作出Ｍｏ２Ｃ膜表面３维模拟图。结果表明：实验测得的高度和高差统计分布与计算机模拟的结果一致。     

CO氧化反应耦合下SrFe1.125Co0.375Oy的氧渗透行为

报道ＳｒＦｅ１．１２５Ｃｏ０．３７５Ｏｙ致密陶瓷膜在高氧梯度下的氧渗透行为。将膜的一端置于空气中,另一端引入ＣＯ,通过ＣＯ的氧化反应降低氧分压,增大膜两端的氧分压梯度。研究发现：９００℃时氧渗透率高达１６．０＊１０＊－７ｍｏｌ／ｃｍ＾２ｓ。在８５０℃以上,氧渗透率与温度的依赖关系不显著,而氧渗透量与ＣＯ分压成线形关系,并且与膜的厚变化基本无关,这表明在该膜材料的渗透过程是受表面反应控制的。     

一类时滞微分方程解的振动准则

本文建立了一类时滞微分方程一切解振动的必要充分条件     

六方沸石分子筛催化剂用于异丁烷与丁烯的烷基化

异构烷烃与烯烃的烷基化是炼油装置制备高辛烷值汽油添加剂的重要途径.目前传统工艺仍使用矿物酸如硫酸或氢氟酸作催化剂,由于该工艺存在着产物分离困难、设备腐蚀严重及环境污染问题,从60年代起国内外开始致力于新型固体酸催化剂的研究与开发工作,已报道的有离子交换树脂[1]、分子筛催化剂[2]及SO=4/MxOy型催化剂[3]等,在分子筛催化剂中已报道的有立方沸石[4]β-分子筛[5]、ZSM系列[5]、分子筛[5]、蒙脱石[5]及MCM-22[6]等,这些催化剂的共性是催化活性较高,但失活较快.目前对分子筛催化剂的研究主要集中在改进的立方沸石体系,而六方沸石催化剂催化异丁烷与丁烯烷基化反应尚未见报道.     

LaH分子的X1∑+态的势能函数

应用原子分子反应静力学原理导出LaH分子的电子状态和可能的离解极限,考虑相对论紧致有效势RCEP(RelativisticCompactEffectivePotential)近似下,用QCISD方法计算了LaH分子基态X1∑+的平衡几何Re和离解能De为2.125A和2.623eV,并在计算出来的一系列单点势能基础上,用正规方程组拟合Murrell-Sorbie(M-S)势能函数,得到相应态的解析势能函数,由此计算对应的光谱参数,其Be、ae、ωe和ωexe的理论值,分别为:3.7333、0.0723、1461.73和21.383cm-1.     

CCl_2自由基被无机小分子猝灭的速率常数

对ＣＣｌ４／Ａｒ混合气体脉冲直流高压放电产生 ＣＣｌ２自由基,用 ５４１．５２ ｎｍ激光将电子基态 ＣＣｌ２激励到Ａ１Ｂ１（０,４,０）振动能级上．通过检测激发态 ＣＣｌ２时间分辨荧光信号,测得室温下 ＣＣｌ２（Ａ１Ｂ１和 ａ３Ｂ１）被 Ｏ２、Ｎ２、ＮＯ、ＣＯ２、ＣＳ２、Ｈ２Ｏ、ＳＯ２,和ＳＦ６分子猝灭的实验结果．用我们提出的三能级模型分析处理实验数据,获得了ＣＣｌ２（Ａ１Ｂ１）态和 ＣＣｌ２（ａ３Ｂ１）态的碰撞猝灭速率常数 ｋＡ和 ｋａ值．     

Fluorescein labeling of estrogen for application of fluorescence polarization binding assays for antibody and receptor

The fluorescence polarization binding assay (FPBA) using fluorescein-labeled estrogen tracer is a homogeneous assay applicable to both estrogen antibody and estrogen receptor-binding assays. Two estrogen-ethylendiamine fluoresceinthiobamyl (E-EDF) tracers were synthesized; estrogen-6-EDF (E-6-F) derived from 6-ketoestradiol 6-(o-carboxymethyl) oxime and estrogen-17-EDF (E-17-F) was from 17β-estradiol 17-hemisuccinate. In both FPBAs using antibody and receptor, E-6-F tracer (Rf_365nm=0.58) showed a better binding response than E-17-F (Rf_365nm=0.70) indicating that the 17-position of estrogen seems to play an essential role as a binding site for antibody or receptor. In the optimized conditions of FPBA for E₂ using E-6-F tracer, antibody binding (K_d=9.4×10⁻⁹ M) is 50 times sensitive than receptor binding (K_d=4.6×10⁻⁸ M). Binding responses of estrogen and its related chemicals by FPBA indicate that antibody binding assay is able to screen the structural similarity of estrogen showing some response with methyltestosterone (K_i=2.1×10⁻⁵ M). On the other hand, the receptor assay is able to screen for estrogenic chemicals such as tamoxifen (K_i=4.5×10⁻⁹ M) and diethylstilbesterol (K_i=8.1×10⁻⁷ M). Therefore, E-6-F tracer is useful as a tracer for FPBA that is able to screen for chemicals structurally similar to estrogen using antibody, and that is able to screen for chemicals functionally similar to estrogen using receptor binding assay.     

Bend, break and count

This paper gives a formula for the number of members of a given ‘nice’ family of rational curves on a surface passing through the appropriate number of general points, expressing this number in terms of reducible members of the family. Similar formulae have been obtained previously using methods of quantum cohomology, but the present method is by contrast completely elementary, relying merely on some simple geometry on ruled surfaces.     

COMPOSITIONAL HETEROGENEITY OF ETHYLENE OXIDE-BUTYLENE TEREPHTHALATE SEGMENTED COPOLYMER*

A series of ethylene oxide-butylene terephthalate (EOBT) segmented copolymers with differentsoft segment length and hard segment content were synthesized. The compositional heterogeneity was studiedby solvent extraction. The results show that the compositional heterogeneity increases when soft segmentlength and hard segment content increase. The compositional heterogeneity is also reflected in thecrystallization behavior and morphology of soft and hard segment in EOBT segmented copolymer. The morecompositional heterogeneous the EOBT segmented copolymer is, the more different the morphology and thecrystallization behavior between separated fractions. Compared with ethylene oxide-ethylene terephthalate(EOET) segmented copolymer, compositional heterogeneity in EOBT segmented copolymer is weaker. Butthe compositional heterogeneity in EOBT segmented copolymer with long soft segment and high hardsegment content is still obvious.     

Spectral Characteristics of Raman Emissions from Miniature Pulsed Optically Pumped Far Infrared Laser

A miniature FIR laser with a sample-tube in 10 or 20cm length were constructed, and the laser's cavity consisted of a pair of metallic meshes, with NH3 molecules as active medium pumped by a TEA-CO2 laser, a series of FIR laser lines were observed. By taking account of the properties of the Fabry-Perot cavity and the gain characteristics of Raman transitions in the miniature optically pumped FIR laser, the spectral characteristics of the FIR laser were studied.