采用ZL-2超强脉冲放电装置实现了7A04超硬铝合金试件中斜裂纹的止裂实验.在瞬间超强脉冲电流作用下,裂尖前缘发生了强烈的绕流热集中现象,斜裂纹裂尖附近金属熔化,钝化了裂尖,阻止了干线裂纹源的开裂趋势.对止裂前后裂尖附近金属组织进行了显微观察,并对止裂前后裂纹附近的断口进行了对比分析;在万能材料试验机上对试件进行了拉伸力学性能对比测试.研究表明:在斜裂纹止裂瞬间,裂尖熔化,同时实现了组织超细化,提高了裂纹的扩展功,改善了试件的抗拉力学性能

18.1 Special Architectures Pipelining. Parallel Processing. Retiming. Unfolding. ia Folding Transformation Look-Ahead Technique. Associativity Transformation. Distributivity Arithmetic Processor Architectures. Computer-Aided Design. Future VLSI DSP Systems Keshab K. Parhi 18.2 Signal Processing Chips and Applications University of Minnesota System. Implementation of a Finite Impulse Response Filter with Rulph Chassaing the TMS320C25. Floating-Point TMS320C30-Based Development Roger Williams University

17.1 Digital Image Processing Image Capture. Point Operations Image Enhancement. Digital Purdue University Image Compression. Reconstruction. Edge Detection.Analysis Charles A.Bouman and Computer Vision Purdue University 17.2 Video Signal Processing Sampling. Quantization. Vector Quantization.Video Sarah A. Rajala Compression Informatin Preserving Coders.Predictive North Carolina State University Coding. Motion-Compensated Predictive Coding- Transform Coding. Subband Coding HDTV. Motion Estimation N.K.Bose

16.1 Spectral Analysis State University of New York Historical Perspective. Modern Spectral Analysis at Buffalo 16.2 Parameter Estimation Dimitri Kazakos Louisiana Estimation Schemes 16.3 Kalman Filtering Fred Daum Kalman Filter Equations.Kalman Filter Examples.Extended Kalman Raytheon Company

Yariv Ephraim ATeT Bell Laboratories George Mason University Jesse W.Fussell General Approaches. Model Adaptation. Analysis-by-Synthesis. Department of Defense Particular Implementations. Speech Quality and Intelligibility Standardiza Variable Rate Coding. Summary and Conclusions Lynn D. Wilcox FX Palo Alto Lab

对SnAgCu合金粉末的真空蒸镀涂层硬脂酸的成膜机理进行了研究.采用扫描电镜(SEM)和透射电镜(TEM)对涂覆后合金粉末的形貌及结构进行观测,采用傅里叶红外光谱仪(FTIR)和X射线光电子能谱仪(XPS)对涂覆后粉末的透射吸收谱和光电子能量进行测试.结果表明:硬脂酸在合金粉末表面形成一层均匀致密、厚度为5~10 nm的薄膜,硬脂酸涂层SnAgCu合金粉末的行为属于物理吸附行为,其生长方式遵循岛状生长机理模式,其过程实质是一个气-固转换、晶体生长的过程

用光学显微镜、扫描电镜、透射电镜和能谱分析等方法研究了涟钢CSP热轧板卷边部裂纹的成因.结果表明:连铸坯表面的深振痕是热轧板卷边部裂纹的起源,连铸坯角部过冷导致奥氏体晶界AlN的细小析出,加剧了连铸坯对裂纹的敏感性.连铸坯经过精轧机组的轧制后,连铸坯表面的横裂纹扩展成为热轧板卷的锯齿状裂纹,严重时会造成烂边或掉块

采用动电位极化方法研究了在0.5mol·L-1 NaHCO3溶液中Cl-对X80管线钢腐蚀行为的影响,并通过电容测量方法对其腐蚀机理进行了探讨.实验结果表明:Cl-使X80管线钢在0.5mol·L-1 NaHCO3溶液中发生了点腐蚀,且随着溶液中Cl-含量增加,腐蚀坑的数量增多,腐蚀坑的直径增大,降低了X80管线钢的耐腐蚀性能.Mott-Schottky分析表明:随着溶液中Cl-含量增加,X80管线钢钝化膜内的施主密度随之增大,增加了X80管线钢钝化膜局部破裂和腐蚀萌生的潜在位置,从而使其耐腐蚀性下降

14.1 Fourier Transforms Introduction. The Classical Fourier Transform for CT Signals. ion of CT Periodic Signals.Generalized T Fourier Transform.Relationship e Fourier Transform 14.2 Fou er Transform lationship to the Finite Time W. Kenneth Jenkins University of Illinois Amplitude,and Phase Alexander D. Poularikas

or Circuit analysis and Design gregory rollins uction. DC(Steady-State) Analysis. AC Analysis. Transient Process and device simulation Process simulation associates. Inc. Peter Bendix 13.2 Parameter Extraction for Analog Circuit Simulation Introduction. MOS DC Models. BSIM Extraction Strategy in LSI Logic Corp