激光头主板用FPC关键材料研究

FPC有广阔的发展及应用空间,对FPC的的卷曲、弯折以及温度和湿度载荷下的疲劳可靠性也有了更高的要求。本文通过对激光头主板用FPC关键材料的实验研究,通过对比实验选择出了提高激光头主板FPC电路的弯折性的FPC材料,其产品电路的弯折达1000万次,达到国内的先进水平。     

影视剧显示的大数据技术

大数据无疑是2013年IT业内最热的词.厂商热推,媒体热炒,仿佛不谈大数据,不推大数据,不用大数据,就没有了未来.当IT业界正在爆炒大数据的时候,影视圈的导演和主角们自然也不甘寂寞,他们雄赳赳、气昂昂地投身到这场轰轰烈烈的造星运动之中.本文对英剧《黑镜》、电影《点球成金》和美剧《疑犯追踪》中的大数据元素进行了分析,体现了大数据的无穷魅力,展望了大数据广泛的应用前景.     

A microwave scattering model for layered vegetation

A microwave scattering model was developed for layered vegetation based on an iterative solution of the radiative transfer equation up to the second order to account for multiple scattering within the canopy and between the ground and the canopy. The model is designed to operate over a wide frequency range for both deciduous and coniferous forest and to account for the branch size distribution, leaf orientation distribution, and branch orientation distribution for each size. The canopy is modeled as a two-layered medium above a rough interface. The upper layer is the crown, containing leaves, stems, and branches. The lower layer is the trunk region, modeled as randomly positioned cylinders with a preferred orientation distribution above an irregular soil surface. Comparisons of results obtained using this model with measurements from deciduous and coniferous forests show good agreement at several frequencies for both like and cross polarizations     

MSTP体系结构研究

随着IP数据、话音和图像等多种业务传输需求的不断提高,现有以承载话音为主要业务的城域网在容量以及接口能力上都已经无法满足业务传输与汇聚的要求。以SDH为基础的多业务传输平台能够克服传统城域网的缺点,可以更有效地支持分组数据业务,并有助于实现从电路交换网向分组网的过度。介绍了MSTP的分类方法,给出了MSTP的分层结构,并对各功能模块的需求和特点进行了详细分析。     

一种ECC加密芯片抗功耗攻击研究

设计了随机掩码在ECC加密算法中的应用方法,为了降低加密芯片的功耗和面积,提高运算性能,研究设计了关键步固定值掩码算法,实验证明提出的方法在资源增加非常有限的情况下可以有效抵抗一阶差分功耗攻击.同时,其他加密算法也可参考此关键步固定值掩码算法来高效设计抗功耗攻击加密芯片.     

2D DOA Estimation of Coherently Distributed Noncircular Sources

A novel method for two-dimensional direction-of-arrival estimation of coherently distributed (CD) noncircular sources is proposed. It is the first time that we introduce the noncircularity of signal into CD model to estimate central azimuth angle and central elevation angle. Numerical simulations are also provided in contrast with the other ESPRIT-like method. The results indicate that our proposed method owns better estimation performance under both low signal-to-noise ratio and small number of array elements.     

基于光纤光栅器件的聚合物微环传感信号解调

基于啁啾光纤光栅和长周期光栅,文章提出一种应用于聚合物微环传感器和微环传感器阵列的信号解调方法.通过调整长周期光栅的峰值波长来匹配感测范围,从而实现线性边沿滤波.该系统由全光纤器件组成,这种解调可以达到31 pm的高分辨率.双通道系统中,每个通道的波长带宽为2.4 nm.     

信息化条件下直升机维修保障人才培训体系

针对目前直升机维修保障力量难以适应信息化作战保障要求的问题,对直升机维修保障人才培训的特点和规律进行研究。介绍信息化条件下直升机维修保障人才培训的新特点,分析当前影响直升机维修保障人才培训效益的主要因素,从5个方面提出了信息化条件下直升机维修保障人才培训体系建设措施。研究结果表明:该体系为直升机专业院校和直升机部队的维修保障人才培训提供了理论依据,能促进直升机维修保障人才培训能力的提高。     

Silver Stars: Silver–Polymer Composite Stars: Synthesis and Applications (Adv. Funct. Mater. 9/2011)

Colloidal “silver stars” were synthesized upon poly(lactic‐co‐glycolic) acid nanosphere templates via a facile two‐step silver reduction method. Myriad dendrimer‐like Ag star morphologies were synthesized by varying the amount of poly(vinyl alcohol) and trisodium citrate used during silver reduction. Scanning electron microscopy studies revealed that star‐shaped silver–polymer composites possessing nanoscopic, fractal morphologies with diameters ranging from 500 nm to 7 μm were produced. These composites have broad applications from antibacterial agents to catalysis; two such applications were tested here. Surface‐enhanced Raman spectroscopy (SERS) studies showed multiple hot spots of SERS activity within a single star. Electrochemical catalysis experiments demonstrated the feasibility of using the silver stars instead of platinum for the oxygen reduction reaction in alkaline fuel cells.     

关联规则挖掘结果的可视化技术研究

数据挖掘结果可视化是将数据挖掘后得到的知识和结果以图形等可视化形式表示出来,从而使用户可以更加方便并深入地对结果进行观察和分析.本文介绍了关联规则的基本概念,详细讨论了用于关联规则挖掘结果可视化的几种常用技术,并对其进行分析比较,给出了各自的优缺点.