面向21世纪小学教师素质结构的研究

教师素质是决定教育教学效果的关键因素。由于时代的发展及当代的教育改革 ,对 2 1世纪的小学教师素质提出了更高的要求 ,未来的小学教师应具备高尚的师德修养 ,正确的教育理念 ,合理的知识和能力结构 ,良好的身心素质及信息素质。教师素质具有适应性、全面性、整体性     

低弹网络丝在喷嘴丝道内运动规律探讨

本论文借助于实验手段揭示网络加工过程中,低弹丝在喷嘴丝道内受气流作用时的运动规律和气流在喷嘴丝道内的流动规律,借以揭示网络丝的网络结形成机理,为合理设计网络喷嘴提供依据。     

评二战中的“驼峰”航运

“驼峰”航线产生于中国抗战最危难的时刻,它是当时世界上最困难最危险的航线,是二战中最庞大的空中运输规模体系,是抗战后期开展外贸和对外交往的最主要国际通道,是东方战线上最受关注的战略航空线,同时也是集战争、勇气、友谊为一体的最著名的航线。     

A FRAMEWORK FOR REAL-VALUED CIPHER SYSTEMS

Most cipher systems designed thus far are binary-valued or integer-valued cipher systems. Their security relies on the assumption that one-way functions exist. Though the existence of one-way functions has not been proved yet, most cryptographic researchers believe that one-way functions exist. In addition, many candidates for one-way functions have been proposed. Therefore, the key step for developing real-valued cipher systems is to define real one-way functions and to propose candidates for them. In this paper, based on computational complexity theory over the real field, we give two definitions of real one-way functions; one is for digital one-way functions and the other is for general one-way functions. Candidates for these two classes of one-way functions are also proposed. Moreover, we present two examples to demonstrate that the candidates for both digital one-way functions and general one-way functions can be applied to construct secure real-valued cipher systems.     

DYJ系列油加热器在化工设备上的应用

本文主要叙述了DYJ系列油加热器与蒸汽加热方式相比的一些优越性,以及怎样用在化工行业的反应釜和塑料压延设备上.     

哈里·柯林斯思想对SSK的贡献研究

在诸多科学知识社会学的文献中,柯林斯文章的引证率位居同类研究者榜首,文章分析了哈里·柯林斯在其研究范围内做出的贡献。     

Enrichment of trace scandium with microcrystalline naphthalene and subsequent ICP-AES determination

A new method is proposed to preconcentrate and separate trace scandium from a large volume of aqueous solution by solid liquid extraction with microcrystalline naphthalene. Scandium oxinate can be adsorbed onto microcrystalline naphthalene quantitatively under certain conditions. The effects of various experimental parameters have been optimized. The influence of additive of cobalt (II) on recovery of scandium (III) is studied in detail. The proposed method has been used for determination of Sc in Certified Reference Material of “Vehicle Exhaust Particulates”.     

磁处理技术作用机理的探讨

从有关的实验事实出发，提出了磁处理技术的微观机理模型，即磁场对分子结构和磁性均为各向异性的液态抗磁物质作用后，使其分子在管道中由“无序”流动转变为“有序”流动．这种磁场诱导的液态物质的“有序”流动构成了磁处理技术的微观机理．利用这一机理对几种常用的磁处理技术进行了解释，并就有关问题进行了讨论．     

血液低密度脂蛋白和纤维蛋白原的选择净化

以新型类肝素聚阴离子磺化羟丙基壳聚糖（ＨＰＣＳＳ）为净化剂，研究其选择净化血液低密度脂蛋白（ＬＤＬ）及纤维蛋白原（Ｆｉｂ）的性能，分别考察了净化剂用量和净化体系ｐＨ值对净化效果的影响，确立了较好的净化条件。结果表明，在ｐＨ＝４．７７￣４．７２，净化剂初始浓度４０００ｍｇ／Ｌ时，磺化羟丙基壳聚糖具有良好的选择净化性能，是一种新型ＬＤＬ／Ｆｉｂ净化剂。可使血浆总胆固醇下降４５％￣６６％，低密度脂蛋白和