RS(255,223)译码器的设计与FPGA实现

RS码是一种多进制分组循环码。检错和纠错能力强．尤其适合纠正突发错误，在通信系统中有着广泛的应用。本文所研究的RS(255，223)译码器采用修正的Euclid译码算法(MEA)，介绍了一种基于FPGA的RS译码器的设计和硬件电路实现方案。按照自顶向下的设计流程．划分模块．详细论述了各子模块的设计过程。     

高超声速巡航飞行器在线航迹规划方法

为解决弹载计算机内存小、运算速度慢与在线航迹规划内存需求大、实时性要求高之间的矛盾,给出了基于高速DSP的高超声速飞行器在线航迹规划方案。介绍了一种实时航迹规划策略,设计了基于ADSP21364的在线航迹规划器,提出了改进的稀疏A*算法,最后进行了地面模拟飞行试验。仿真结果表明,设计的规划策略和规划算法能够在现有硬件基础上避开各种新威胁,生成一条当前最优/次优的航迹,并且规划稳定性好、成功率高。     

TV图像插值的双方向扩散改进算法

提出了一种双方向扩散图像插值方法,有效地减小了插值图像的边缘宽度,从而获得清晰而光滑的图像边缘.这种双方向扩散在图像边缘斜坡较亮一侧进行前向扩散,而在边缘斜坡较暗一侧进行后向扩散.同时,它能根据图像边缘的特征自适应地调整前向、后向扩散强度,从而避免了在插值的图像中产生虚的纹理或边缘.数值实验结果显示,该方法既能很好地减小插值图像的边缘宽度,又不会产生其他人工虚像.     

低功耗矢量水声信号采集处理系统设计与实现

为进一步降低矢量水听器信号采集处理系统对水下滑翔机平台的续航影响,设计了一种以 ARM和 DSP 为核心控制 器的低功耗信号采集处理系统。利用ARM 控制器实现系统的多种工作模式,以达到不同状态下的最佳功耗控制。此外,在 控制软件中加入必要的优先级设计和流水线设计,以提高系统硬件控制效率,最后利用功率测试仪对系统不同工作模式进行 测试。结果表明,低功耗模式下平均功耗约为1.27 W, 实时处理模式下平均功耗约为4.29 W。 在长时间连续工作情况下,可 大幅度降低实时处理模式的工作时间占比,功耗控制效果显著,有效证明了该方案的有效性和优越性。     

Preparation and structure of fluorinated/non-fluorinated polyacrylate gradient emulsion blend film

The emulsion blend method, which is environmentally friendly and energy saving, was used to prepare a compositional gradient film of fluorinated/non-fluorinated polyacrylate in this paper. The size and glass-transition temperature (T_g) of the emulsion particles were designed to enhance the driving force of their selective congregation and promote the formation of gradient structure. The structures and surface properties of the obtained films were characterized. The results showed that when the fluorinated components have much smaller particle size and higher T_g than those of fluorine-free polyacrylate components, the gradient structures formed in the direction across the film thickness of the films. The concentration of the fluorinated component increased gradually from film-glass interface to film-air interface in the blend film, making the surface free energies of the two sides of the gradient film distinctively different.     

Machine learning-based real-time visible fatigue crack growth detection

Many large-scale and complex structural components are applied in the aeronautics and automobile industries.However,the repeated alternating or cyclic loads in ...     

Biomimetic Robust Starch Composite Films with Super-Hydrophobicity and Vivid Structural Colors

The starch composite films (SCFs) will be one of the best alternative packaging materials to petroleum based plastic films, which mitigates white pollution and energy consumption. However, weak mechanical stability, water resistance, and dyeability has hindered the application of SCFs. Herein, a bioinspired robust SCFs with super-hydrophobicity and excellent structural colors were prepared by fiber-reinforcement and assembling SiO₂/Polydimethylsiloxane (PDMS) amorphous arrays on the surface of SCFs. The properties of the designed SCFs were investigated by various methods including scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermo-gravimetric analysis (TGA), a tensile test, contact angle (CA) test, and an optical test. The results showed that the obtained SCFs possessed a higher tensile strength (55.17 MPa) attributed to the formed abundant hydrogen bonds between the molecular chains of the starch, cellulose fiber, and polyvinyl alcohol. Benefiting from the nanostructure with rough surface which were modified by materials with low surface free energy, the contact angle and sliding angle of the film reached up to 154° and 2°, respectively. The colors which were produced by the constructive interference of the coherent scattered light could cover all of the visible regions by tuning the diameters of the SiO₂ nanoparticles. The strategy in the present study not only reinforces the mechanical strength and water resistance of SCFs but also provides an environmentally friendly way to color the them, which shows unprecedented application potential in packaging materials of the starch composite films.     

HDDR工艺条件及均匀化处理对Nd12.6Fe69.3Co11.6 B6.0 Al0.5合金磁性能的影响

研究了HDDR工艺条件(包括HD温度、HD时间、DR温度、DR时间)对Nd12.6Fe69．3Co11.6B6．0Al0．5合金磁性能的影响；比较了均匀化处理和未均匀化处理的合金经HDDR工艺后磁性能的差异；通过对两种舍金原始态的XRD谱线分析，找出存在差异的原因。     

设计科学中国化发展的历史与学科路径研究

通过对设计科学中国化发展的历史回顾,来考察设计科学中国化之路的学科路径及其主要议题。运用文献考证和理论辨析的方法,讨论自20世纪50年代以来设计科学的中国化探索与路径,并结合欧美设计研究的背景展开横向联系与比较,以揭示相关理论在传播中的联系性和语境差异。在设计科学的中国化发展历程中,工程设计领域起到了重要的推动作用,艺术+设计的质性方法,在设计学研究中让位于技术+设计的科学方法。进入21世纪,随着中国设计学学科体系的完善,不但改变了以往设计科学研究与设计实践之间相脱离的现象,而且出现了从理论引入转向立足本土创新的局面。