结合Delaunay 三角面分离法与搜索球策略的三维曲面重建算法

基于曲面重建在计算机图形学、三维GIS、逆向工程等领域有重要应用,结合区 域生长法与Delaunay 三角剖分的优势,提出了一种新的散乱点云曲面重建算法。首先根据曲面 中轴性质提出了分离角定义并推导了相关结论,利用局部Delaunay 三角形分离角性质抽取大量 位于模型表面三角形,从而构建种子三角网增加初始区域的生长面积其次运用自适应搜索球法 加快邻域三角形搜索并识别曲面边界。对比传统的基于Delaunay 法和传统区域生长法,该方法 只需要一次三角剖分,无需极点与法向量计算,重建速度快,具有Delaunay 三角网格的优良结 构特性,孔洞数量少,重建出的三维模型几何信息与拓扑关系准确。实验表明,结合Delaunay 三角剖分与区域生长法重构有向的流形三角网格模型,能够提高三维模型的重建效果与速度, 有效地自动识别曲面边界。     

Social Manufacturing for High-end Apparel Customization

Social manufacturing (SM), a novel distributed, collaborative and intelligent manufacturing mode, is proposed and developed for high-end apparel customization. The main components of SM cloud are designed, and its research topics are summarized. Then, SM's key technologies are studied. 3D technologies for apparel customization, like 3D modeling, 3D fitting mirror and 3D customization, are developed to improve the customization precision and user experience. Information based collaborative management is realized to share, communicate, and handle the information efficiently among all groups and individuals of SM cloud. Suppliers' evaluation mechanism is designed to support the optimal decisions making. Next, SM cloud is constructed in five layers for high-end apparel customization. By using SM cloud based crowd-sourcing, social resources can be allocated rationally and utilized efficiently, consumer can customize the product in any processes like innovation, design, making, marketing and service, and traditional apparel enterprise can be upgraded into SM mode for keeping it competitive in the future customization markets.      

基于假设检验的回归模型算法在脱靶量解算中的应用

在脱靶量处理中,准确选取弹道的拟合函数是计算脱靶参数的关键.本文首先利用假设检验的回归模型算法,合理选取模型并确定函数阶次,提高函数逼近程度,减小了经验选模的函数拟合误差.其次,通过运用双弹道的数据融合算法解算脱靶量参数,消除了传统算法在弹道参数衔接点的跳跃现象,并通过理论仿真和实测数据验证了算法的有效性.     

含二氮杂萘酮结构耐热胶粘剂的研究

研究了一种含二氮杂萘酮结构耐热型环氧固化剂，与低分子质量聚酰胺复合使用得到的环氧胶粘剂具有良好的耐热性，固化工艺为140℃／2h 180℃/3h,150℃有25MPa以上的拉伸剪切强度，以及极好的高温保持率，可达到100％。详细研究了表面处理方式和固化工艺对其在常温和150℃下拉伸剪切强度的影响。     

An XPS study of the sulfidation-regeneration cycle of a hydroprocessing catalyst

The formation of sulphates in an industrial Ni-W Hydroprocessing (HP) catalyst was investigated by X-ray Photoelectron Spectroscopy (XPS). A small fluidized bed test unit with on-line sampling device was constructed to simulate industrial sulfidation and oxyregeneration processes of HP catalysts. The results obtained show that the sulfates observed on the surface of sulfided catalysts are not formed during the sulfidation process. Two oxidation processes seem to be responsible for the formation of sulfates. One of the processes happens when the catalyst is exposed to air before it is properly cooled. The other is a slow conversion at ambient temperature. The two different processes might be associated to different sulfidic species formed during the sulfidation processes, with the sulfides in the bulk of catalyst particles being more easily oxidized than the ones on the external surface of the catalyst particles. The sulfate formed during the air oxidation of sulfided catalysts, as well as that after oxyregeneration is not aluminum sulfate but nickel sulfate in both cases. XPS results also indicate that oxygenates in the feedstock are not directly involved in the sulfate formation.     

提高PMMA塑料光纤芯材耐热性的方法

介绍了提高以聚甲基丙烯酸甲酯(PMM A)为芯材的塑料光纤的耐热性的方法。     

中水回用循环冷却水系统现场应用

天津滨海热电厂采用天津开发区中水作为循环冷却水系统的补充水，研究了适应天津滨海热电厂系统材质和工况条件的水处理药剂及其配套处理技术，并应用于现场运行。一年多的现场应用效果表明，中水回用于循环水系统的处理技术获得成功，并取得了明显的经济效益和社会效益。     

变频器在罗茨风机上的使用

由于工艺线的改造,我公司二台155kW罗茨风机由原来1 000t/d生产线入窑生料供料改为1 500t/d生产线生料库均化及入窑生料放库用,存在严重能力过剩.为了解决这一问题,我们在综合分析现有二台窑的生产工艺状况,从简化工艺、减少设备控制点、降低消耗等方面考虑,充分利用现有设备,取得很好效果。     

Synthesis and characterization of copolyimides with high solubility

A series of copolyimides were prepared from various diamines (polysiloxane and isophorone units) with aromatic tetracarboxylic dianhydrides via a two‐step (thermal imidization) method. The monomers and polymers were produced in high yields, and the copolyimides containing Si? O? C bonds and asymmetric meta catenation in the polymer backbone exhibited good solubility. The glass‐transition temperatures (T_g's) of all the copolyimides were found to be 201–262 and 215–258°C by differential scanning calorimetry (DSC) and dynamic mechanical analysis, respectively. Thermogravimetric analyses indicated that the polymers were fairly stable up to 502–578°C (10 wt % loss in N2) and 490–574°C (10 wt % loss in air). The char yields at 800°C in N2 and air atmospheres were 26–59 and 20–53%, respectively. The copolymerization results, determined with 1H‐NMR and DSC, indicated a random copolymer. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 1963–1970, 2003     

含纳米级铝粉的复合炸药研究

铝粉的颗粒尺寸对含铝炸药的爆轰性能有显著影响，在以RDX为主体的粘结炸药中，加入20％粒径为50nm的超细铝粉，得到的新型复合炸药，其爆轰性能及作功能力明显高于含20％粒径为5μm和50μm的复合炸药。