反相悬浮聚合法合成超强吸水剂

探讨采用反相悬浮聚合法、合成聚丙烯酸盐超强吸水剂的工艺条件。结果表明：反应液中和废、单体浓度反应引发温度及交联剂种类及用量，对聚合反应的稳定进行有着很大的影响。采用本法制成的超强吸水剂，其吸去离子水能力达１２００－１４００ｇ／ｇ。制成的吸水剂凝胶粒子有一定的粒径分布。     

Analysis of Inter-Modulation Interference for MM-Wave Receiver

The problem of inter-modulation interference is an important problem in super-heterodyne receiver. In the past, the analysis about it was carried out for the lower frequency communication for example the short wave communication. In this paper, the analysis about inter-modulation interference and the output signal of frequency mixer will be carried out for MM-wave communication according to the features of MM-wave multi-channel communication. Then, the corresponding methods to reduce or avoid mixer output interference and inter-modulation interference are recommended.     

基于近场激发与增强的新型多层纳米薄膜结构在非线性光学器件上的应用与发展前景

传统光学引入了远场衍射的尺度极限。自从提出了近场光学技术以来 ,由于近场扫描光学显微镜 (NSOM)系统的复杂性而使得近扬的引入和利用变得困难。具有多层纳米薄膜结构的超分辨近场结构 (Super RENS)的提出改变了这种局面 ,并在诸如超高密度光学数据存储、近场光刻技术、纳米光子学晶体管等领域获得了重要的应用。围绕Su per RENS技术 ,通过综述它的基本原理、物理机制以及各项应用 ,指出了基于近场激发与增强原理的新型多层纳米薄膜结构在未来非线性光学器件上的应用与发展前景     

超高密度磁光存储及其介质研究进展

短波长（蓝光）磁光存储，磁光超分辨近场结构光存储（Super-RENS)、混合记录技术是近年来发展起来的超大容量磁光存储技术，文章介绍了这些技术用于超高密度磁光存储的原理，并对其研究现状及发展前景作了全面综述。     

超强碱催化剂碱强度(H->37)的指示剂测定法

传统的指示剂滴定法只能测定H-＜37的超强碱催化剂的碱强度.本文开发了一组指示剂用来测定不同碱强度的催化剂.实验结果证实该法测定H-＞37的超强碱催化剂非常有效,最高碱强度可测到H-≥43.     

光子晶体超窄带滤波器

本文利用光学传输矩阵法研究了一种类似于谐振腔结构的光子晶体.研究发现在这种光子晶体的光子带隙的中央存在一个极窄的透光窗口,窗口的宽度在红外波段1500nm附近可以做到0.0001nm以下,窗口内的透光率峰值可以接近100%,窗口以外的区域的透光率可以做到0.01%以下.通过改变所研究结构中的周期厚度、中间夹层厚度、两边光子晶体的周期重复数和波的入射角可以改变窄带透过窗口的位置和窄带的宽度.这种光子晶体可以用来制作超窄带滤波器,有望在光通信超密度波分复用技术和光学信息精密测量技术当中获得应用.     

纳米银修饰的超疏水界面用于农药的超灵敏检测

采用化学还原法,在具有不同微观结构的规整的不锈钢网和聚纤维素酯薄膜表面合成了银纳米颗粒.利用氟化试剂对复合界面进行处理,形成超疏水性能的界面,能有效地浓缩目标分子.以罗丹明6G(R 6G)为分析物,纳米银修饰聚纤维素酯薄膜为基底,采用表面增强拉曼散射(SERS)分析了氟化处理前后基底对目标分子的检测能力.实验结果表明,具有超疏水性能的复合基底对R 6G分子的检出限为1 ×10-16 mol/L.以纳米银修饰的不锈钢网和聚纤维素酯两种复合材料为基底,对常用杀虫剂敌百虫的检出限分别为1×10-15 mol/L和1×10-16 mol/L.     

Theoretical investigations on the conversions of cyclic polysulfides to acyclic polysulfide diradicals and subsequent reactions of biological interest

Sulfur is one of the most necessary biogenic elements in nature that must be assimilated by all organisms; it is an essential macronutrient for living organisms and has multiple roles in plant development. The oxidation of elemental sulfur is a complex process involving the contact of cells with sulfur particles, the oxidation of sulfur to sulfite, and the oxidation of sulfite to sulfate. To provide hypothesis concerning the most probable processes in the early states, we determined, by quantum-chemical calculations, the energies of some allotropic forms containing up to 32–40 sulfur atoms and energetics of their reactions with triplet dioxygen. The most probable reactions occurred with methylpolysulfane anions with an electron transfer to give the superoxide anion radical (and thiyls radicals) and especially the formation of peroxydic polysulfane anions. Calculations confirmed that the triplet diradical is more stable than the singlet one for acyclic polysulfide chains.     

Super connectivity of k-regular interconnection networks

Super connectivity is an important issue in interconnection networks. It has been shown that if a network possesses the super connectivity property, it has a high reliability and a small vertex failure rate. Many interconnection networks, like the hypercubes, twisted-cubes, crossed-cubes, möbius cubes, split-stars, and recursive circulant graphs, are proven to be super connected; and the augmented cubes are maximum connected. However, each network vertex has a higher degree as long as the number of vertices increases exponentially. For example, each vertex of the hypercube Q_n has a degree of n, and each vertex of the augmented cube AQ_n has a degree of 2n − 1. In this paper, we not only show that the augmented cube AQ_n is super connected for n = 1, 2 and n ? 4, but also propose a variation of AQ_n, denoted by AQ_n,i, such that V(AQ_n,i) = V(AQ_n), E(AQ_n,i) ⊆ E(AQ_n), and AQ_n,i is i-regular with n ? 3 and 3 ? i ? 2n − 1, in which AQ_n,i is also super connected. In addition, we state the diameter of AQ_n,i.     

Determination of Polyacrylate Super Absorbent Polymers in Air

Abstract

A sampling and analytical method has been developed for measurement of a starch-grafted, cross-linked sodium polyacrylate in air. Also, the method is applicable to measurement of several other polyacrylate super absorbent polymers and involves air sampling with a 37-mm PVC membrane filter, treatment of the sample with 0.07 M cupric acetate solution to form a copper-polymer precipitate, digestion of the precipitate with nitric and perchloric acids, and measurement of the copper content by inductively-coupled plasma-atomic emission spectrophotometry. The interior surface of the front piece of the filter cassette also is analyzed. This analytical method has been compared with a sodium method that currently is used. Detection limits for various super absorbent polymers ranged from 4.4 to 14 micrograms per sample.