凿岩钻进机械自动化发展现状及方向

介绍了凿岩钻进自动化的重要性，阐述了钻进自动化的发展历程。分析了钻车自动化的发展现状，指出了自动钻车科研工作的不足以及未来的发展方向。     

Oxygen chemisorption at Cu(110) at 120 K: dimers, clusters and mono-atomic oxygen states

Three distinct states of oxygen have been observed at a Cu(110) surface at 120 K by scanning tunnelling microscopy (STM): isolated oxygen adatoms; pairs or dimers, separated by about 6 Å and clusters of five or six atoms arranged anisotropically. There is also evidence for oxygen atoms undergoing ballistic motion as might be expected from “hot” oxygen atoms. Such states of oxygen have been central to the mechanistic models proposed earlier, and based on surface spectroscopic studies, for the oxidation of ammonia at copper surfaces under ammonia-rich conditions.     

盾构法隧道防水堵漏技术

分析隧道渗漏水的机理,总结国内外盾构法隧道防水堵漏的技术方法,并结合上海地铁二号线东昌路－东方路区间隧道施工堵漏,提出了防渗堵漏的技术措施。     

21世纪地铁施工技术展望

展望２１世纪地铁施工的新技术、新工艺,并对区间隧道,地铁车站不同的施工方法进行比较,提出新的开发方向。     

Voltage assisted control of spin-transfer nano-oscillators

The spin-transfer nano-oscillator(STNO) has recently acquired a huge amount of research interest, due to its promising easy tunability along with the miniature size. The output frequency control of an STNO through magnetic field and current has been examined almost to its full extent; however, there are issues that still need to be addressed. Here, we propose a novel way of voltage control of the output frequency of an STNO, and alongside reducing its power requirement.     

Metal nanolayer formed by tunnelling current through thin oxide in the electrolyte–oxide–silicon system

We propose a method of forming metal nanoparticles or layers on the oxide by tunnelling current of the EOS (electrolyte–oxide–silicon) system. Electrical characteristics of the metal layer and particles obtained experimentally by the proposed method are compared with the electrolyte–metal–oxide–silicon and the metal–oxide–silicon systems. Also, it is shown that the instability of the EOS system is caused by the H⁺ penetration into the oxide and is largely cured by applying alternative voltage to extract the H⁺ ions from the oxide. We show that the proposed technique can selectively deposit extremely thin metal layers on the active sites of the silicon surface in a self-alignment manner.     

盾构推进液压系统的PLC控制

介绍了盾构推进液压系统的工作原理.研制了以可编程控制器(PLC)为核心的盾构推进液压控制系统.对控制系统的硬件结构、软件组成、控制方式和控制策略等作了详细介绍,实现了对推进液压系统的运动控制,达到了预定的控制要求.     

Electron transport through alkanethiolate films decorated with monolayer protected gold clusters

Monolayers of 1,9-nonanedithiol or 1-decanethiol self-assembled directly on the gold substrate transfer charge to the K₄[Fe(CN)₆] molecule in solution more efficiently when they are decorated with 1-butanethiol protected gold nanoclusters. The clusters bound to the electrode by means of dithiol are more uniformly distributed on the monolayer and their efficiency in transferring electrons between the electrode and the redox couple is higher than when they are simply adsorbed through weak van der Waals interactions with the methyl groups of 1-decanethiol. With increasing adsorption time in the solution of clusters, the capacitance of the cluster decorated electrode significantly increases compared to the constant value of capacitance observed after prolonged immersion in pure toluene. This difference is explained assuming that gold clusters act as an array of capacitors on the monolayer modified electrode surface.     

盾构法隧道的纵向受力分析

本文借助等效连续化模型 ,把盾构法隧道假设为弹性地基上的弹塑性梁 ,着重研究了纵向不均匀荷载、不均匀沉降对隧道应力分布以及缝隙张开状况的影响。并以某越江隧道为工程实例 ,分析了隧道的受力变形。     

隧道断层泥注浆加固机理模型试验研究

 为研究永莲隧道断层泥注浆加固机制,设计一套由注浆工艺模块、被注介质模块和信息采集模块构成的断层泥注浆加固试验系统,开展断层泥注浆加固体单轴压缩试验、典型浆–岩界面特征试验和扫描电镜(SEM)试验。结论如下：注浆后断层泥单轴抗压强度可提升181%～2 535%,加固体呈现浆脉开裂→界面附近土体破坏→整体破坏特征,断层泥以骨架式加固模式为主,注浆压力是提升加固效果的主控因素;注浆后浆–岩界面黏聚力可提升93%～274%,分析不同注浆压力、材料和初始干密度对浆–岩界面强度的影响,相比双液浆,单液浆可使界面黏聚力提升幅度增加125%～148%;注浆后断层泥由絮状结构转化为密实整体结构,浆–岩界面是具有一定厚度的不规则结构体,由胶结面、渗透过渡区及微劈裂过渡区构成,界面附近存在物理力学特征突变区,定义了浆–岩界面的直接及间接加固模式。试验结论对于注浆加固理论的认知和注浆工程的应用有一定的指导作用。