对衣料类柔性曲面变形的一种描述

为模拟服装曲面的形成过程，本文提出了一种描述衣料类柔性曲面变形过程的方法，应用该种方法，给出了模拟百褶裙形成过程的实例。     

反求工程中曲面生成算法的研究

介绍了曲面造型技术的发展过程和反求工程的概念、应用及关键技术，在深入分析和比较各种曲面造型方法的基础上，阐明了NURBS方法是反求工程中曲面生成的最优算法，并用NURBS方法对某车体覆盖件进行了曲面重构．     

用UGⅡ三维造型CAD软件对全顺汽车高顶蓬的设计

根据自由曲面以及曲面造型的原理，结合UGⅡ三维造型CAD软件的自由曲面造型的方法，阐述对于外部形状复杂的全顺汽车高顶蓬三维造型CAD的全过程，包括合理划分曲面片，前、中、后三部分曲面片设计，实体模型设计以及在造型过程中的一些思路和方法，并由此得出完成复杂自由曲面造型设计的三个结论，可供工程设计者参考。     

共轭曲面接触线的生成与回转曲面轮廓线方程式的建立

论证了两个运动的，相互接触的曲为共轭曲面，用工程图学及运动几何学的方法，研究了接触线的形成原理，回转曲面轮廓的生成及数学建模。     

自由曲面与正弦曲面合成造型及其应用

提出自由曲面与正弦曲面合成造型的方法，由正弦曲线扫成生成正弦曲面，通过改变正弦函数的幅值，频率以及初始相位参数和自由曲面的控制网格，生成合成曲面的多种形式，该算法简单，易于控制，并且于地形模拟。     

曲面造型研究

阐述了曲面造型的发展史，分析了其现状、发展趋势及研究热点，指出了曲面造型技术的研究领域已从传统的研究曲面表示、曲面求交和曲面拼接，扩充到曲面变形、曲面重建、曲面简化、曲面转换和曲面等距性；在曲面的表示方法上，以网格细分为特征的离散造型优于传统的连续造型．     

采用Bezier曲面生成叶片锻造三维有限元模拟的模具网格

根据叶片锻模的特点提出采用Ｂｅｚｉｅｒ曲线将叶片锻造三维有限元模拟的模具上分散的点分组拟合成曲面块,并同时对各拟合出的Ｂｅｚｉｅｒ曲面块进行网格划分,进而拼接后形成模具网格,从而为方便地处理模拟过程中模具和坯料间的摩擦问题和动态接触问题打下了一定的基础。     

共轭旋转曲面法求解线棒材矫直辊型曲线

以共轭旋转曲面啮合理论为基础，分析了线棒材矫直过程中确定矫直辊辊型曲线的解析方法，并对矫直辊的曲面方程、轴向剖面方程进行了计算机模拟，给出了设计、绘制矫直辊辊型曲线的方便快捷的方法。     

曲面测量方法研究

采用NURBS方法对曲面进行了描述，建立了复杂曲面统一的数学模型。探讨了应用三坐标测量机对加工曲面进行有效测量的方法，提出了运用自适应规划的原理进行测量网格的划分方法和加工曲面是否合格的判定依据，提出了限定最小不合格区域的网格生成方法。对复杂曲面的数控加工和测量具有一定的参考价值。     

基于OO的曲面造型

提出了一种基于面向对象（ＯｂｊｅｃｔＯｒｉｅｎｔｅｄ）技术的统一曲面模型，它将ＮＵＲＢＳ曲面和解析曲面在方法上统一起来在这个模型的基础上，有关曲面造型的所有问题（如曲面的编辑、修改，曲面的求交、裁剪、过渡和偏置等运算）都得到了简化，且在方法上得到了统一．     

粗糙金属表面接触的压力场和温度场

在研究金属表面的摩擦、磨损、边界膜成膜、疲劳及胶合等机理时,有必要搞清粗糙金属表面接触的压力场,温度场及应力场。过去人们在计算表面接触性能(压力场、温度场及应力场)时,往往忽略微凸体之间的相互影响,这在边界摩擦与干摩擦状况下与实际有较大差异。本文用一种新方法在考虑了微凸体之间互相影响的基础上,计算了弹性粗糙平面滑块与刚性光滑平面接触的压力场和温度场。这为进一步计算等温应力与热应力场打下了基础,也为研究边界膜成膜,磨损及表面胶合机理提供了一定的理论依据。     

同坡曲面的方程及其在弯斜路面边坡设计和绘图中的应用

对同坡曲面的形成作了分析,给出更为一般的同坡曲面的方程,特别对于目前建筑工程中的常用弯斜路面边坡,做了较深入的研究,找出了该曲面等高线的规律,给出了此曲面的方程和等高线方程,从而将过去的近似作图改为精确作图.为弯斜路面边坡的设计和计算机绘图提供了一种新方法.     

硬切削加工表面完整性及预测方法研究

硬切削取代磨削加工的关键是如何获得理想的加工表面完整性,以硬切削加工的表面粗糙度、白层、残余应力分布等表面完整性因素的形成机制、影响作用规律、预测方法和服役性能为对象,总结了PCBN刀具切削淬硬钢表面完整性的研究状况,提出了从零件使役性能角度来控制和优化硬切削加工表面完整性的研究思路,为硬切削加工表面完整性的控制及其疲劳磨损性能的提高,提供了理论和实用基础.     

Surface characteristics of mussel-inspired polydopamine coating on titanium substrates

Mussel adhesive proteins are non-toxic, biodegradable and have low immunogenic qualities that make them highly attractive for medical purposes compared with man-made materials. 3,4-DOPA, which is a dopamine precursor, is a critical element for achieving mussel-like adhesive properties. In present study, polydopamine was coated onto the titanium surfaces by dipping in a 2 mg/mL dopamine solution in 10 mM Tris- HCl buffer at pH 8.5. EDX element analysis and Raman spectroscopic analysis of the surface were conducted to verify the formation of polydopamine. The surface characteristics of polydopamine-coated titanium plates were observed by SEM and AFM. Hydrophilicity and corrosion-resistance were also evaluated by static contact angle measurements and potentiodynamic polarization corrosion tests. The absorption intensity for pH-induced polymerization rapidly increased for the initial four hours and thereafter smoothly increased. EDX element analyses revealed that the content of carbon and oxygen increased and the content of titanium decreased after the coating process. In the Raman spectra, polydopamine resulted in two new peaks at approximately 1 370 and 1 570 cm^-1 resulting from the stretching and deformation of catechol. Microstructural features revealed that nanometer-sized bright granules were randomly distributed after coating, and these nanoparticles grew with increased coating time. The Ra values of polydopamine-coated titanium plates were showed to increase with coating time. Compared to the pure titanium curve, the inflection point of polydopamine-coated titanium was located at a higher corrosion potential and lower corrosion current density. Findings from our research suggested that polydopamine coatings offer a versatile approach for titanium surface modification.     

磨削高体积分数SiCp/Al复合材料表面形成机制

针对高体积分数SiCp/Al复合材料精密加工问题,研究了磨削加工高体积分数SiCp/Al复合材料表面形貌的形成机制.使用金刚石砂轮在干式和湿式两种磨削条件下对高体积分数SiCp/Al复合材料进行磨削实验研究,通过表面粗糙度仪对表面粗糙度进行测量,运用扫描电镜对磨削加工的表面形貌进行观测研究.结果表明：该材料磨削表面的主要缺陷为SiC颗粒拔出、破碎、压入和Al基体的涂敷等,SiC颗粒的破碎和脱落是磨削加工该材料表面形成的主要机制.两种磨削条件下工件进给速度对表面粗糙度的影响比磨削深度更显著,湿式磨削无论是在工件已加工表面形貌和微观结构还是表面粗糙度上都好于干式磨削.     

多电极静电拉伸薄膜反射镜的面形优化

为了提高多电极静电拉伸薄膜反射镜的面形精度,基于Henky-Campbell圆薄膜平衡方程分析了薄膜均布载荷作用下的拉伸成形和面形误差。采用ANSYS软件一阶优化法,建立了以薄膜屈服强度为状态变量,镜面3个同心环形区域上施加的载荷为设计变量,以反射镜面形与理想面形的最小均方根误差(RMS)为目标的优化模型,对口径300 mm、中心挠度分别为0.5、1.0和1.5 mm的薄膜反射镜面形进行了优化。实验中优化后的最佳镜面面形RMS为7.73μm,PV值为50.69μm,较优化前分别减少了30.2%和23.7%。     

Effects of different characteristic surfaces at initial stage of frost growth

The effects of surface energy on phase change of water vapor at initial stage of frost growth were studied to find an effective method of restraining frost growth. The mechanism of restraining frost growth by low energy surface (bigger contact angle) was analyzed based on crystal growth theory. Then, the phase change of water vapor and the process of frost growth on the copper and wax energy surfaces were observed using microscope. The results indicate that it is difficult for wax surface (low energy surface), on which there are still water droplets at 100 s, to form critical embryo, so frost growth can be restrained in a way. Water formation, droplet growth, ice formation and dendritic ice growth processes happen on both surfaces, ordinally. But the ice beads, with larger average diameter and sparse distribution on the wax surface, form later (at about 300 s) than that on the copper surface, and the dendritic ice also appears later. All of these support that ice crystal formation and dendritic crystal growth at initial stage of frost growth can be retarded on the low energy surface.     

冷藏库门滴水现象的成因分析

针对某高温冷藏库库门大量滴水现象，采用简化后的Ｋｉｅｎｅｒ法计算库门上方墙体的内部结露量，判定其主要成因是，由于库内外温差产生的热压作用在库门开启时形成空气对流致使墙面上产生大量的表面结露。采用库门处势流流场公式计算对流空气所产生的表面结露量，将其与实测滴水量以及Ｋｉｅｐｅｒ法计算的内部结露量进行了对比，证实本文的成因分析是正确的。     

Oxygen adsorption on pyrite （100） surface by density functional theory

Pyrite (FeS2) bulk and (100) surface properties and the oxygen adsorption on the surface were studiedby using density functional theory methods. The results show that in the formation of FeS2 (100) surface, there exists a process of electron transfer from Fe dangling bond to S dangling bond. In this situation, surface Fe and S atoms have more ionic properties. Both Fe^2 and S^2- have high electrochemistry reduction activity, which is the base for oxygen adsorption. From the viewpoint of adsorption energy, the parallel form oxygen adsorption is in preference The result also shows that the state of oxygen absorbed on FeS2 surface acts as peroxides rather than O2.     

Surface passivation of nanocrystalline silicon powder derived from cryomilling

The surface passivation mechanism of nanocrystalline silicon powder was studied. The liquid nitrogen/argon was used as the medium to prepare the nanocrystalline silicon powder, using a cryomilling technology. The X-ray diffraction, transmission electron microscopy, plasma emission spectroscopy and infrared spectrum were used to analyze the prepared samples, and density functional theory was used to investigate the cryomilling process. For nanocrystalline silicon powder cryomilled with liquid N2, the amorphous outer layer with N element is formed On the surface, and chemisorption caused by the formation of Si-N-Si bond leads to the surface passivation; although physisorpfion also he confirmed, the Si-N bond is steady after exploded in air for 30 days and no new bond is observed. For nanocrystalline silicon powder cryomilled with liquid At, no new chemical bond is Observed, Ar element absorbs on the surface of the prepared powder only through physisorption, and after exploded in air for 30 days, a Si-O bond can be observed obviously.