Surface and electrochemical analysis for the understanding of TiO2 nanopores/nanotubes changes in post‐elaboration treatment

The electrochemical stability of TiO₂ nanoarchitecture fabricated in fluoride electrolyte presented in this paper is related to 2D and 3D geometries that present a shift from nanopores toward nanotubes. The fabrication conditions involve a 60 V applied voltage for 2 hours of anodizing in order to create the ordered structures, in a mixture of low‐water glycerol electrolyte and fluoride. With the use of different ultrasonication times, a variety of nanotubes/nanopores were observed. The surface interfacial aspects were investigated mainly by surface microscopy and hydrophilic/hydrophobic balance for the grown structures ultrasonicated at various periods of time. The electrochemical behavior of the nanotube‐structured surface was performed by potentiodynamic evaluation and electrochemical impedance spectroscopy in a simulated body fluid solution. As a most important result, all surface analysis and electrochemical data interpretation permitted the proposition of a model for elaboration of different nanostructures from nanopores to nanotubes. These different surface nanoarchitectures were obtained as a result of ultrasonication at various periods of time. Copyright © 2010 John Wiley & Sons, Ltd.     

服装结构与形态——对中国传统“服装裁剪”与形态的思考

论述了服装结构与形态的关系。指出了服装结构形式的产生，是人们对服装形态分析和研究的结果，先有构想的服装形态，才会有相对应的结构形式，并指出构想的服装形态是由服饰观念来决定，由此而推断传统的服饰观是传统服装裁剪形成的关键因素。     

磁场作用于工艺系统对切削过程影响的试验

通过试验研究磁场作用于工艺系统对切削力、刀具磨损、系统稳定性及加工精度的影响，根据切削区摩擦系数的对比试验和磁畴理论分析了磁场对刀具刃磨后表面残余应力的影响。对其机理进行了探讨。研究表明，磁场作用结果使刀具磨损减小、切削力降低、工艺系统稳定、加工精度提高。     

国内外新型刀具材料的发展现状

随着涂层技术及加工业的发展，近年来国内外刀具材料发展迅速。这里主要介绍几种新型刀具材料的性能特点。     

切槽机建模及其工作过程模拟

介绍 3D Studio MAX制作的一般过程 ,以 YD41 40型切槽机的 CAD为基础 ,利用该软件为切槽机建立模型 ,并对其工作过程进行动态模拟 .通过建模和动态仿真 ,检验和校正了切槽机 CAD设计中的一些不足     

Ion implantation effects on the microhardness and microstructure of GaN

We study the effect of N⁺ and O⁺ implantation on the microhardness and the microstructure of epitaxially grown GaN. The microhardness is measured using a Knoop diamond indenter while information on the effect of implantation on the surface morphology, microstructure and electronic structure is provided by atomic force microscopy, cross-section transmission electron microscopy and near edge X-ray absorption fine structure (NEXAFS) spectroscopy. It is demonstrated that implantation increases the surface microhardness. A possible mechanism for the surface hardening effect is based on the formation of N interstitials that pin the dislocations and prohibit the plastic deformation. In addition to the hardening effect, the implantation induced N interstitials introduce a characteristic resonance in the NEXAFS spectra, at 1.4 eV below the absorption edge.     

铸铁压缩破坏的应力分析

用不同长径比的灰口铸铁圆柱试样和氯氧镁混合物试样进行压缩试验，研究其端面摩擦力对试件破坏断口的影响，分析其应力状态和破坏原因。     

Intercalation-induced changes in DNA supercoiling observed in real-time by atomic force microscopy

Atomic force microscopy (AFM) has been employed to observe in real-time and in an aqueous environment the process of ethidium bromide induced supercoiling in individual DNA plasmid molecules. Image data reveal both the onset and the progressive presence of plectonemic DNA supercoiling. In addition, significant molecular motion of the surface adsorbed DNA is observed. These data illustrate the potential of AFM in the time-resolved study of biomolecular processes, and hence, provide new insights into biomolecular structure and function.     

利用AFM电场诱导氧化实现纳米结构

利用导电原子力显微镜（AFM）在硅、其它半导体和金属表面的电场诱导氧化加工是实现纳米器件的有效方法。大气状态下样品表面吸附的水膜在电场诱导氧化加工中的必要性被证实，实验给出了相对湿度与氧化线宽度的关系。在氢钝化表面成功地制备出纳米尺度的线和图形结构，最小的线宽为22nm。     

Structure and dynamics of polymeric materials in nano-scale

The nano-palpation technique,i.e.,nanometer-scale elastic and viscoelastic measurements based on atomic force microscope,is introduced.It is demonstrated to be very useful in analyzing nanometer-scale materials properties for the surfaces and interfaces of various types of soft materials.It enables us to obtain not only structural information but also mechanical information about a material at the same place and at the same time.