动感像素全息母版图案的设计制作研究

本文介绍了一种新颖的数码像素全息高速拍摄装置来实现全息母版的制作。提出和介绍了运用Photoshop软件一些特殊的图像处理功能设计制作动感像素全息图的方法,并结合多种防伪技术,使产生的图案具有不可仿制的图形畸变特点,并列举了设计实例。     

0.64BaTi4O9-0.36BaEu2Ti4O12/BaTi4O9纤维复合陶瓷的相结构研究

利用XRD，XPS和TEM等测试手段对0.64BaTi4O9-0.36BaEu2Ti4O12/BaTi4O9纤维复合陶瓷新材料的相结构进行了研究。研究结果表明：随着BaTi4O6纤维的加入，烧结试样表面O元素的含量提高，材料中Ti^3 离子和Ti^2 离子的含量降低，材料介电性能有所提高。     

多内核、多线程的SoC引致调试困难

有经验的开发人员都知道,要保证嵌入式产品的成功实现、调试和维护,好的工具支持是非常关键的.SoC(系统芯片)设计带来了一系列新的问题,使好的工具支持变得更加关键.部分问题可以归因于SoC设计使用的部件,其可访问性和可视性本来就有所下降;其它原因则可归因于在硬件和软件方面复杂性的增加.     

B2O3·TiO2/Ti催化剂对水中腐殖酸吸附行为研究

TiO2光电催化氧化有机物的反应被认为是表面反应,有机物在TiO2表面的吸附是其降解的先决条件,因此系统研究有机物在TiO2表面的吸附行为,可以为进一步的光电催化降解提供实验依据.现采用阳极氧化法在基体钛表面原位合成B2O3·TiO2/Ti催化剂为吸附剂,系统地研究了腐殖酸在膜催化剂上的吸附行为,探讨了温度、溶液pH值、腐殖酸初始浓度、外加偏压等因素对吸附的影响,结果表明:低温、酸性条件下有利于腐殖酸在膜催化剂上吸附,吸附量随初始浓度、外加偏压的增加而增大,B2O3·TiO2/Ti催化剂吸附腐殖酸的等温线数据可用Freundlich等温吸附方程描述,吸附过程遵循Lagergren二级吸附动力学模型.     

HDGN型多功能缓蚀剂的研究

<正> 随着科学技术的发展,特别是环境保护的加强,对缓蚀剂的要求也愈来愈高。不仅要求防锈效果好,无毒或低毒,价格便宜,而且,由于在实际生产过程中,一个产品及其加工设备往往是由多种金属组成的,因此,在防锈上,还希望缓蚀剂能同时适用于多种金属,即多功能。这个问题。在油溶性缓蚀剂中基本得到了解决,而在水溶性缓蚀     

2004年起中国将启用新的金属废料分类目录及报关方法

在交流条件硅酸钠溶液中利用微等离子体氧化技术合成了陶瓷涂层。通过XRD，EPMA分析了所得陶瓷涂层在不同层面上的相组成、微观结构及元素分布。由陶瓷涂层截面的背散射图看出陶瓷涂层较致密、与基体结合强度高。XRD分析结果显示，陶瓷涂层的最外层由莫来石及γ-Al2O3相组成，随着向陶瓷涂层内部的移动，莫来石的含量逐渐减少，α-Al2O3，γ-A12O3相的含量逐渐提高，而且陶瓷涂层的颜色由白色逐渐变为黑色。硅元素在陶瓷涂层的外侧及陶瓷涂层与基体的交界处陶瓷涂层一侧含量较多，在陶瓷涂层中间含量少。而陶瓷涂层的硬度变化也出现了中间高，两侧低的分布情况。     

钛合金微等离子体氧化研究进展

微等离子体氧化技术可以有效地改善钛合金的表面性能,拓宽其应用领域。本文详细介绍了钛合金微等离子体氧化的基本过程以及在铝酸盐和磷酸盐体系中钛合金的微等离子体氧化膜的结构、特点、性能及其应用。     

微等离子体氧化陶瓷膜对钛合金接触腐蚀的影响

在铝酸钠溶液中，利用微等离子体氧化技术，在TC4钛合金表面原位生长复合氧化物陶瓷膜，研究了陶瓷膜的相组成、形貌和陶瓷膜对钛合金接触腐蚀的影响。陶瓷膜由Al2TiO5，α-Al2O3和RutileTiO2构成；整个膜层由致密层和疏松层组成。陶瓷膜层改善了钛合金与LY12铝合金和H62黄铜的接触腐蚀，陶瓷膜层使得钛合金与LY12铝合金电偶对的电偶电流降低为原来的1／7，使得钛合金与H62黄铜的电偶电流降低为原来的1／2。     

SNORE: spike noise removal and detection

A method for detection and removal of random spike noise in magnetic resonance (MR) raw data (k-space data) is described. This method would reduce or eliminate the corduroy-type and higher than usual level artifacts in MR images resulting from random spike noise in k-space data. The method described involves applying a spatially varying threshold to be k-space data. Any data point that has a magnitude greater than that of the threshold value at that location will be replaced by a local complex average of the neighboring data points or some other suitable data replacement scheme.     

Ice-crystal absorption: a comparison between theory and implications for remote sensing

The problem of the disagreement between cirrus crystal sizes determined remotely and by in situ measurements is shown to be due to inappropriate application of Mie theory. We retrieved the absorption optical depth at 8.3 and 11.1 mum from 11 tropical anvil cirrus clouds, using data from the High Resolution Infrared Radiation Sounder (HIRS). We related the absorption optical depth ratio between the two wavelengths to crystal size (the size was defined in terms of the crystal median mass dimension) by assuming Mie theory applied to ice spheres and anomalous diffraction theory (ADT) applied to hexagonal columns, hexagonal plates, bullet rosettes, and aggregates (polycrystals). The application of Mie theory to retrievals yielded crystal sizes approximately one third those obtained with ADT. The retrievals of crystal size by use of HIRS data are compared with measurements of habit and crystal size obtained from in situ measurements of tropical anvil cirrus particles. The results of the comparison show that ADT provides the more realistic retrieval. Moreover, we demonstrate that at infrared wavelengths retrieval of crystal size depends on assumed habit. The reason why Mie theory predicts smaller sizes than ADT is shown to result from particle geometry and enhanced absorption owing to the capture of photons from above the edge of the particle (tunneling). The contribution of particle geometry to absorption is three times greater than from tunneling, but this process enhances absorption by a further 35%. The complex angular momentum and T-matrix methods are used to show that the contribution to absorption by tunneling is diminished as the asphericity of spheroidal particles is increased. At an aspect ratio of 6 the contribution to the absorption that is due to tunneling is substantially reduced for oblate particles, whereas for prolate particles the tunneling contribution is reduced by 50% relative to the sphere.