嵌段共聚物热解法制备硅基多孔陶瓷的研究进展

热解嵌段共聚物是最近发展起来的一种制备多孔陶瓷的新方法,因其具有可灵活调控孔结构的优势而逐渐受到关注。目前采用该方法制备的主要有硅氧、硅碳、硅氮等硅基多孔陶瓷。依据所用聚合物,多孔陶瓷的制备可分为有机嵌段共聚物/陶瓷前驱体共热解法及有机-无机嵌段共聚物一步热解法两种途径。近年来一步热解法逐渐受到研究者的关注,因为它可以直接通过嵌段共聚物微相结构的控制达到热解陶瓷成孔形状、孔径大小、有序性及比表面积等参数的较好调控,有望拓宽多孔陶瓷的应用领域。本文对这两种制备方法进行了比较,综述了国内外相关研究进展。     

Scott连续自映射不动点的注记

It is discussed in this paper that under what conditions, for a continuous domain L, there is a Scott continuous self-mapping f ： L → L such that the set of fixed points fix（f） is not continuous in the ordering induced by L. For any algebraic domain L with a countable base and a smallest element, the problem presented by Huth is partially solved. Also, an example is given and shows that there is a bounded complete domain L such that for any Scott continuous stable self-mapping f, fix（f） is not the retract of L.     

15N（p,n)15O反应中子源0°角激发函数测量

利用中国原子能科学研究院HI-13串列加速器上的多探测器快中子飞行时间谱仪, 测量了38个不同入射质子能量点下15N（p, n)15O反应0°角方向的激发函数。 测量数据用蒙特卡罗方法进行了模拟, 以进行中子注量衰减和入射窗厚度的不确定度修正。 实验在入射质子能量位于6.029—8.056 MeV之间时发现了3个共振峰, 这一点与DROSG 2000评价数据及PTB数据相符合, 但三家的截面数值存在差异, 对这些差异需要作进一步深入探讨。 The excitation function of 15N（p, n)15O reaction at 0 degree was measured at 38 energy points using the fast neutron Time of Flight (TOF) spectrometer at the HI 13 Tandem Accelerator in the China Institute of Atomic Energy（CIAE）. The measured data were analyzed by Monte Carlo simulation for the corrections of neutron flux attenuation and uncertainty of the thickness of the entrance foil. Three resonance peaks were observed in this experiment in the energy range from 6.029 to 8.056 MeV,which is comparable with the DROSG 2000 evaluated data and the PTB data. However,more experimental studies are needed since the cross sections deviate with each other.     

Multi-pass,multi-bunch beam breakup for 9-cell Tesla cavities in the ERL

Generally, the Energy Recovery Linac (ERL) needs specially designed high current superconducting RF cavities. In this paper, the threshold current of beam breakup for compact ERL facilities with 9-cell Tesla type cavities are investigated. The results show that it is feasible to adopt the 9-cell Tesla cavity for compact ERL test facilities with just a few cavities and beam current around 10 mA.     

模糊正则文法的逼近性

为了扩大现有研究的应用范围,基于max-min型模糊正则文法引入了max-*型模糊正则文法(其中*为特定t-模)的概念,讨论了max-*型模糊正则文法可以通过max-min型模糊正则文法在任意给定的逼近精度来逼近.研究表明,当t-模*满足一定的条件时,max-*型模糊正则文法与max-min型模糊正则文法在生成模糊语言能力方面是等价的.     

一类函数估计在负相协下的渐近正态性

在NA样本下构造了生存函数^-F（x）=P（X〉x）的估计^F-n（x），并在适当的条件下建立了√n[^-Fn（x）-^-F（x）]的渐近正态性。     

多苯基芳基类硅化合物作为硅聚合物热稳定剂的研究

本文通过Diels-Alder反应合成了四苯(基)苯基三乙氧基硅烷及四苯(基)苄基三乙氧基硅烷,产率均为96％左右。并作了下列耐热性研究:(1)把两种化合物分别作为硅橡胶混炼时的热稳定剂,所得硅弹性体其热老化稳定性及机械强度均较好。(2)把两种化合物分别作为室温硫化硅橡胶固化时的交联剂,所制得的胶片在350℃老化10小时仍保持弹性。(3)两种化合物分别与H_3BO_3反应,制得耐热性硅硼树脂,是一种优良的耐高温涂料。     

Sober拓扑分子格

A topological molecular lattice (TML) is a pair (L, T), where L is a completely distributive lattice and r is a subframe of L. There is an obvious forgetful functor from the category TML of TML‘s to the category Loc of locales. In this note,it is showed that this forgetful functor has a right adjoint. Then, by this adjunction,a special kind of topological molecular lattices called sober topological molecular lattices is introduced and investigated.     

几类格值自动机的关系

本文给出了四类格值自动机及其语言的定义，证明了前三类格值自动机的等价性，讨论了第四类格值自动机与前三类格值自动机的关系。     

一类函数估计在负相协下的强一致相合性

对于半参数回归模型 yi=xiβ +g( ti) +ei,i =1 ,2 ,… ,n,对误差 {ei,1 i n}为 NA序列 ,在适当的条件下证明了未知函数 g( t) 的估计 gn( t) 的强一致相合性 .