基于AT89C2051的单户可视对讲门铃室内分机的设计

本文介绍一种基于单片机AT89C2501的单户可视对讲门铃室内分机的工作原理及软、硬件的设计与实现方法。     

桥梁颤振气动导数识别的迭代法

本文提出一种利用自由振动响应通过年顿－拉夫逊迭代同时识别出桥梁全部8个颤振气动导的方法。此法具有对迭代初值要求不高，识别结果稳定的特点，并具有一定的抗噪声干扰能力。数字仿真与实物试验结果表明本文方法有效，可行。     

造纸黑液制水煤浆添加剂成浆性能的研究

针对淮化德士古气化炉所用的义马煤和鲁南化肥厂使用的配煤 ,进行了造纸黑液制添加剂实验室和工业制浆性能的考察。结果表明 ,其在工业应用中的添加量范围在 1.2 %～ 1.6 % (浆基 ,添加剂含固量 2 0 % ) ,对义马煤和鲁南配煤分别可以制出浓度在 6 4 .5 %和 6 9%之间 ,稳定性能良好 ,满足工业生产要求的水煤浆     

Action recognition by hidden temporal models

We focus on the recognition of human actions in uncontrolled videos that may contain complex temporal structures. It is a difficult problem because of the large intra-class variations in viewpoint, video length, motion pattern, etc. To address these difficulties, we propose a novel system in this paper that represents each action class by hidden temporal models. In this system, we represent the crucial action event per category by a video segment that covers a fixed number of frames and can move temporally within the sequences. To capture the temporal structures, the video segment is described by a temporal pyramid model. To capture large intra-class variations, multiple models are combined using Or operation to represent alternative structures. The index of model and the start frame of segment are both treated as hidden variables. We implement a learning procedure based on the latent SVM method. The proposed approach is tested on two difficult benchmarks: the Olympic Sports and HMDB51 data sets. The experimental results reveal that our system is comparable to the state-of-the-art methods in the literature.     

Re-ranking for microblog retrieval via multiple graph model

As a new information sharing platform, microblog has got explosive growth in recent years and has become an important source for public opinion mining. A variety of information like the reviews of brands/products or the trends of events can be socially sensed from such kind of data. However, it is still a challenging task to search relevant microblogs as the user generated content tends to be mixed with noise. Besides short text, image is getting popular in microblogs due to its power in visual information conveying. In this paper, we leverage textual and visual cues integratedly and propose a general re-ranking approach for microblog retrieval via multi-graph semi-supervised learning. We argue that the different types of information in microblogs correspond to different relationships among microblogs and each type of the relationship can be represented as a similarity graph. We then integrate different graphs into a unified framework and solve them simultaneously for microblog re-ranking. Extensive experiments on a recently published Brand-Social-Net dataset showed the effectiveness of the proposed method and marginal improvements have been achieved in accuracy as compared to the single graph model based method.     

新时代汽车强国战略研究综述(二)

"新时代汽车强国战略研究综述(一)"提出我国应抓住新一轮汽车变革机遇,加快推进汽车强国建设的结论。在此基础上,本文从问题出发,梳理出汽车强国建设的7个层面34项制约因素,对制约因素进行了分析研究,凝练出了10个瓶颈问题。接下来阐述了当前我国汽车发展的主要矛盾,并结合当前形势、问题与挑战对汽车强国建设进行了战略思考,提出我国需尽快启动新时代汽车强国战略的结论,并就战略实施提出了主要措施和重点方向。     

蛀洞路由器C104及其在多计算机系统中的应用

采用蛀洞路由机制是新型多计算机系统的重要特征。介绍了多计算机系统中蛀洞路由机制的基本概念。     

Synthesis and characterization of TiO2/WO3 composite nanotubes for photocatalytic applications

TiO₂/WO₃ composite nanotubes were synthesized in an anodic aluminum oxide (AAO) template by a sol–gel method. The prepared nanotubes were characterized by transmission electron microscopy, scanning electron microscopy, powder X-ray diffraction, and Brunauer–Emmett–Teller surface area. Using the nanotubes embedded in the AAO templates as catalysts, photocatalytic degradation of methyl orange aqueous solution was carried out under UV light irradiation. The results showed that the TiO₂/WO₃ composite nanotubes with the thickness about 50 nm could be successfully synthesized by this method. TiO₂ showed anatase phase and WO₃ displayed monoclinic phase. The composite nanotubes (TiO₂/WO₃) exhibited higher photocatalytic activity than the pure nanotubes (WO₃ or TiO₂). The possible reason for improving the photocatalytic activity was also discussed.     

WinCC中应用MATLAB开发模糊解耦控制的方法

详细阐述了将MATLAB中开发的模糊解耦控制算法改写成一个C函数,将其封装在动态连接库中.通过WinCC调用动态连接库,将模糊控制的输出通过MPI多点传输协议传递给PLC驱动执行器,实现电石炉控制系统电极调节的模糊解耦控制.     

Nyquist电流型7位20MHz采样率CMOS数模转换器

介绍了一种高速7位DAC的设计及芯片测试结果,该DAC选取高5位单位电流源,低2位二进制电流源的分段结构。考虑了电流源匹配、毛刺降低以及版图中误差补偿等方面的问题来优化电路。流片采用0.35μmChartered双层多晶四层金属工艺,测试结果表明在20 MH z的采样频率下,微分非线性度和积分非线性度分别小于±0.2 LSB和±0.35 LSB。该DAC的满幅建立时间是20 ns,芯片面积为0.17 mm×0.23 mm。电源电压为3.3 V,功耗为3 mW。