凤翔木版年画图案信息的再分析与设计

凤翔木版年画作为我国传统文化的象征，是中华千年文化的极大的体现，蕴含着丰富的文化内涵。面对信息技术的冲击，本文提出运用ASP.NET技术构建年画创意性交流平台，运用图像处理技术强化图案设计等方式加强对其保护，同时对网络创意平台功能、开发语言等做了具体的实践。     

中国铁路“走出去”人才培养培训对策研究

中国铁路"走出去"步伐明显加快,已上升为国家战略,但人才的培养培训却未能跟上中国铁路"走出去"的步伐,已成为制约其进一步发展的关键因素。立足中国铁路"走出去"的人才培养培训问题,分析中国铁路"走出去"人才培养培训的战略目标、应坚持的三个原则和须践行的三个步骤,并在此基础上,阐释了中国铁路"走出去"面临的三大主要任务。从形成两大机制、组建一盟一会、布局三类基地、创新培养模式和构建两大平台五个方面,系统提出了中国铁路"走出去"人才培养培训的战略对策。     

Field synergy principle in forced convection of plane Couette–Poiseuille flows with effect of thermal asymmetry

The field synergy principle is employed to analyze convection heat transfer enhancement which can be achieved by reducing the included angle between the velocity vector and the temperature gradient (synergy angle). The present study is aimed to scrutinize the relationship of the synergy angle and the field synergy number with other pertinent parameters in forced convection of plane Couette–Poiseuille flows with asymmetric heat-flux wall boundary conditions. This type of problem arises in various engineering processes, such as in the operation of extruders and in various lubrication problems. The variation of the velocity vector is governed by the moving plate velocity while the temperature gradient is affected by both the moving plate velocity and the asymmetrical heat fluxes at the wall boundaries. Analytical solutions are obtained and the effects of thermal asymmetries under the imposition of isoflux at the walls in Couette–Poiseuille flows are analyzed by adopting field synergy principle. The variations of synergy angle with different boundary conditions and the relationship between the Nusselt number and the synergy (coordination) number, are compared and analyzed. The thermal condition at the wall boundary, the variations of the moving plate velocity and the Peclet number are the essential parameters in the synergetic behavior of the system.     

Modification of Fe2O3 and its effect on the heat‐resistance of silicone rubber

By means of the wet chemical surface modification, the surface of Fe₂O₃ was modified by vinyltrimethoxysilane (VTMS). Infrared spectroscopy (IR) was used to investigate the structure of the modified Fe₂O₃, and the result showed that VTMS has been attached onto the surface of Fe₂O₃. Effect of VTMS concentration on the active index of the modified Fe₂O₃ was also studied, and the result indicated that the active index of the modified Fe₂O₃ increases with the increase of VTMS concentration and the optimal concentration of VTMS is 12 wt %. The effect of the modified Fe₂O₃ on the tear strength of silicone rubber before and after aging was studied and it was found that in comparison with the unmodified Fe₂O₃ the addition of the modified Fe₂O₃ results in the significant increase of the tear strength before ageing because of the increase of the crosslinking density of silicone rubber. The tear strength of silicone rubber filled with the modified Fe₂O₃ after ageing is higher than that with the unmodified Fe₂O₃, indicating that the modification of Fe₂O₃ can improve the heat‐resistance of silicone rubber owing to the fine dispersion of the modified Fe₂O₃ in silicone rubber. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

小波包与混沌集成的心音特征提取及分类识别

针对心脏疾病诊断过程中心音识别的难点,提出了一种结合小波包分析及混沌的特征提取的心音识别方法。首先分析统计了心音信号的小波包能量特征,然后选取小波包分解中能表征心音信号特征的分量进行混沌分析,计算了最大Lyapunov指数和关联维数;最后以这些参数构成特征矢量作为支持向量机的输入,对临床采集到的65例正常及有心脏疾病的心音信号进行识别分类。结果表明,结合小波包分析和混沌的特征参量,较传统的分类识别方法具有更高的识别精度,说明非线性混沌特征能够较有效地表征心音信号的特征,为下一步临床心脏疾病的更准确诊断奠定了基础。     

Syntheses and magnetic properties of novel bithiazole‐containing polymeric complexes

Three novel bithiazole‐containing polymers were synthesized from 2,2′‐diamino‐4, 4′‐bithiazole (DABT) condensed with bismaleimide, bis(methyloxycarbonyl ethyl)tin dichloride (BETD), and 4,4′‐diphenylmethane diisocyanate (DPDI), respectively. A new series of polymeric complexes were prepared from Fe²⁺ and the three polymers. These polymers and their complexes were characterized through FTIR, ¹H‐NMR, and related techniques. The chemical compositions of the complexes were determined by XPS. The presence of the exchange interaction between the unpaired electrons was investigated by ESR spectroscopy. The magnetic behavior of these complexes was measured as a function of the magnetic field strength (0–40 kOe) at 5 K and as a function of temperature (5–300 K) at a magnetic field strength of 30 kOe. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 1353–1359, 2001     

基于Inception-V3网络的双阶段数字视频篡改检测算法

为了克服现有数字视频取证算法识别准确率低、定位能力差等缺点，提出一种具有高识别率且定位准确的基于Inception-V3网络的二级分类取证算法.在第一级分类器中提出简单的阈值判断方法来区分原始和篡改视频，第二级分类器将采用Inception-V3网络的稠密卷积核结构来自动提取篡改视频帧的高维多尺度特征.高维多尺度特征有助于提升篡改视频帧的识别率.实验结果表明，本文提出的算法不仅能准确地检测出篡改视频，还能从篡改视频中精确定位出篡改帧.