华莱士新党的战略家

美国进步党近在费城举行大会,像民主与共和两党一样,许多重要干部聚集在烟雾迷腾的房间内决定该党的总统候选人与政纲,本文即为对该党重要干部的介绍,原文刊于七月二十六日的「新共和」周刊.——译者     

基于WebGIS高速公路应急指挥关键技术研究

随着我国高速公路建设的扩大,各类交通事故也明显增多,为了避免各种突发事故带来更大的经济损失与人员伤亡,本文在总结以往救援工作的基础上,将WebGIS空间分析技术中的缓冲区分析、叠加分析、统计分析与视频监控等关键技术综合应用于高速公路应急指挥体系中,实现救援物资可视化与事发现场信息的实时反馈,从而提高应急指挥系统在紧急救援方面的效率。     

CO_2分子的屈曲

用分子动力学方法模拟了CO2线形分子在纵向压力作用下的屈曲,与连续介质弹性稳定理论得到的计算结果一致.     

应用数值模拟技术研究安塞油田王窑中西部剩余油分布

为了进一步摸清王窑中西部目前剩余油的分布情况,为下一步注水开发调整提供理论依据和指导,提高油田的产量和开发效果,对王窑中西部进行了数值模拟研究.对1988年到2002年的地质储量、含水率、注水量、累产量和压力等参数进行了拟合,拟合准确度比较高.并在此基础上得到了剩余油饱和度分布图,同时结合现场生产实际对剩余油饱和度分布图进行分析,对下一步的调整方案提出了针对性强的措施.     

机电专业多元化人才培养模式教学改革

本文通过对近几年机电一体化技术专业的人才培养模式教学改革成果总结,形成了一套完整的专业改革思路,供其它学院相关专业参考借鉴。     

界面缩聚法制备聚芳酯复合纳滤膜 III.NF-1复合纳滤膜的结构和性能

通过 Ｉ Ｒ, Ｘ射线衍射分别研究了复合纳滤膜致密层的化学结构及其与性能的关系。采用扫描电镜（ Ｓ Ｅ Ｍ ）和原子力显微镜（ Ａ Ｆ Ｍ ）分别对膜的断面、表面形态作了研究。     

用液流操纵单个DNA分子形成纳米悬链线图形

首先用液流拉伸单分子DNA,使其吸附在修饰过的云母基片上.然后让二次液流沿着垂直于已拉伸的DNA的方向流过云母片,用原子力显微镜(AFM)观测,可见DNA单分子片段在基片上形成了一些纳米尺度的悬链线.提出一种“S悬桥”模型能定量地解释这一现象.该研究工作揭示,在DNA的单分子操作中,经典的弹性力学理论足以描述和控制DNA分子二维图形的形成 关键词： DNA 单分子DNA操纵 原子力显微镜(AFM) 纳米悬链线     

Morphology and Wettability of [Bmim][PF6] Ionic Liquid on HOPG Substrate

We investigate the morphology and wettability of [Bmira][PF6] ionic liquid （IL） on a highly oriented pyrolitic graphite （HOPG） substrate using atomic force microscopy. Thin films, nanometer-sized droplets, and ＂drop-onlayer＂ structures of the IL are found on the substrate. Films with a thickness of up to 2nm （about 4 IL layers） show the solid-like behavior. In contrast, a dewetting phenomenon is observed for thicker IL films, indicating that the IL films retain liquid properties. The contact angle of a buck IL droplet on the HOPG is measured to be about 35°. The wettability of the bulk IL droplet on the HOPG is found to be quite different from that of IL films. These results indicate that the IL molecules can be organized into various micro-morphologies when they are confined to a solid substrate and show characteristic behavior at nanometer scales.     

Effects of Substrate Hydrophobicity/Hydrophilicity on Height Measurement of Individual DNA Molecules

Effects of substrate hydrophobicity/hydrophilicity on height measurement of individual ds-DNA molecules are investigated with tapping mode atomic force microscopy （TMAFM） and vibrating mode scanning polarization force microscopy （VSPFM）. The measured heights of ds-DNA on hydrophobic highly oriented pyrolytic graphite （HOPG） are remarkably less than those on hydrophilic bare mica and Ni^2＋ treated mica in both TMAFM and VSPFM. By analysing the results, we propose that the hydrophobicity/hydrophilicity of substrate can greatly influence the height measurement of DNA molecules.     

NANOBUBBLES AT THE LIQUID/SOLID INTERFACE STUDIED BY ATOMIC FORCE MICROSCOPY

Bubbles on the nanometer scale were produced by a special method on solid surfaces. Atomic Force Microscopy (AFM) was used to detect these bubbles. It shows that nanobubbles can be seen clearly in the interfaces of liquid/graphite and liquid/mica. In AFM images, the nanobubbles appeared like bright spheres. Some of the bubbles kept stable for hours during the experiments. The bubbles were disturbed under high load during AFM imaging. The conformation of the bubbles is influenced by the atomic steps on the graphite substrate. In addition, a shadow was found around the bubbles, which was due to the interactions between a bubble adhered to the tip and a bubble on the substrate.