浅谈混凝土梁桥的维修与加固

文章针对混凝土梁桥维修与加固的程序,从维修加固的基本机理、维修加固各种方法的不同适用范围、材料及工艺要点、注意事项等进行了全面的分析和总结.     

Efficient and stable inverted perovskite solar cells enabled by inhibition of self-aggregation of fullerene electron-transporting compounds

Fullerene-based electron-transporting layers (ETLs) significantly influence the defect passivation and device performance of inverted perovskite solar cells (PS...     

Generation of nonhuman primate retinitis pigmentosa model by in situ knockout of RHO in rhesus macaque retina

Retinitis pigmentosa (RP) is a form of inherited retinal degenerative diseases that ultimately involves the macula,which is present in primates but not in the r...     

浅评我国生态环境监测现状

生态环境监测是环境监测中一个全新的概念,是环境生态建设的技术保证和支持体系.本文阐释了生态环境监测的基本内涵,并结合我国生态环境监测现状,提出了不断完善生态环境监测的一些建议.     

Modeling eBay price using stochastic differential equations

Online auctions have become increasingly popular in recent years. There is a growing body of research on this topic, whereas modeling online auction price curves constitutes one of the most interesting problems. Most research treats price curves as deterministic functions, which ignores the random effects of external and internal factors. To account for the randomness, a more realistic model using stochastic differential equations is proposed in this paper. The online auction price is modeled by a stochastic differential equation in which the deterministic part is equivalent to the second‐order differential equation model proposed in Wang et al. (Journal of the American Statistical Association, 2008, 103, 1100–1118). The model also includes a component representing the measurement errors. Explicit expressions for the likelihood function are also obtained, from which statistical inference can be conducted. Forecast accuracy of the proposed model is compared with the ODE (ordinary differential equation) approach. Simulation results show that the proposed model performs better.     

黄三角装备制造业区域产业专业化发展的实证分析

结合区位商分析法、数据包络分析法以及市场占有率指标法对2015年黄三角装备制造业七大行业的产业专业化程度、产业效率以及市场绩效等方面进行实证分析。结果表明:黄三角装备制造业的总体发展状况良好,七大行业的区域特征明显。针对部分城市出现的规模报酬递减以及市场占有率下滑现象,按照区域分工、优势互补、弱势协作等思路提出发展策略以实现区域经济的全面发展。     

MEMS-Based Low-Cost Flight Control System for Small UAVs

Small unmanned air vehicles （UAVs） can be used for various kinds of surveillance and data collection missions. The UAV flight control system is the key to a successful mission. This paper describes a low-cost micro-electro mechanical system-based flight control system for small UAVs. The integrated hardware flight control system weighs only 24 g. The system includes a highly-integrated wireless transmission link, which is lighter than traditional links. The flight control provides altitude hold control and global positioning system navigation based on gain scheduling proportional-integral-derivative control. Flight tests to survey the grass quality of a large lawn show that the small UAV can fly autonomously according to a series of pre-arranged waypoints with a controlled altitude while the wireless video system transmits images of the surveillance target to a ground control station.     

基于MOST总线的车载音频系统

为解决电子设备增加带来的车身重量增加、布线复杂、电磁干扰影响数据传输质量等问题,设计实现了MOST（Media Oriented System Transport）车载音频系统,完成了对音频设备的控制和流媒体的传输。通过分析各类MOST报文在网络中的通信状况,进一步探索了MOST总线的各种传输功能。实验结果表明了MOST总线在减轻整车质量、加快数据传输速度、降低成本、简化布线和减少干扰等方面的优势。为MOST技术在汽车多媒体、智能家居等领域中的应用,以及将其他车载电子设备接入MOST总线提供了理论和实践依据。     

一种模糊互补判断矩阵的一致性调整方法

在模糊互补判断矩阵的一致性研究成果的基础上借助原判断矩阵P与其权重矩阵W之间的向量夹角,找出需要调整的列及其所对应的行,借助于参数λ调整此行此列,从而提高判断矩阵P的一致性,并给出了相应算例分析。