基于航拍图像的海上目标定位系统

针对海事闭路电视(CCTV)系统未能直接通过视频图像获得海上目标位置信息的现状,提出一种基于航拍图像的海上目标定位系统.该系统基于Visual C++开发平台,以模块化设计思路,实现基于航拍图像的海上目标定位功能.介绍系统组成、主要功能、概位算法以及该定位系统在海事监管、海上搜救中的应用.该定位系统可弥补海事CCTV监管的不足,提升海事监管、海上搜救的效率.     

基于PID控制的EPS系统建模仿真研究

在分析电动助力转向系统数学模型的基础上,构建了基于MATLAB/Simulink的电动助力转向系统仿真模型。采用曲线型助力特性曲线,基于PID控制策略对电动机目标电流进行闭环跟踪控制。分析结果表明:所研究的PID控制策略具有良好的助力性。     

考虑月球引潮力和昼夜温差效应的危岩稳定性分析

危岩稳定性是科学分析崩塌灾情的关键环节。根据天文固体潮理论,分析了月球引潮力造成危岩重力效应出现昼夜交替变化的特征,建立了危岩受月球引潮力作用的荷载计算方法;分析了昼夜温差效应对危岩主控结构面内充填物吸水膨胀特性的影响,提出了膨胀力计算公式;引入月球引潮力和昼夜温差效应膨胀力修正危岩稳定系数计算公式,实例分析表明,考虑月球引潮力和昼夜温差效应后,危岩的稳定系数可降低0.96%～6.73%,坠落式危岩劣化程度更为明显。研究成果对进一步实施危岩破坏机理研究有积极意义。     

考虑月球引潮力和昼夜温差效应的危岩稳定性分析

危岩稳定性是科学分析崩塌灾情的关键环节.根据天文固体潮理论,分析了月球引潮力造成危岩重力效应出现昼夜交替变化的特征,建立了危岩受月球引潮力作用的荷载计算方法;分析了昼夜温差效应对危岩主控结构面内充填物吸水膨胀特性的影响,提出了膨胀力计算公式;引入月球引潮力和昼夜温差效应膨胀力修正危岩稳定系数计算公式,实例分析表明,考虑月球引潮力和昼夜温差效应后,危岩的稳定系数可降低0.96％ ～6.73％,坠落式危岩劣化程度更为明显.研究成果对进一步实施危岩破坏机理研究有积极意义.     

砂浆对灌芯混凝土砌块砌体抗剪性能影响试验

对铺浆和无浆两组共24个灌芯混凝土砌块砌体抗剪性能分别进行了试验,对各砌块的抗剪破坏过程进行了观测.根据试验现象及所采集的加载数据,分析了铺浆灌芯混凝土砌块和无浆灌芯混凝土砌块的抗剪破坏机理及破坏形态.用所测得的抗剪强度平均值与砌体规范抗剪强度平均值公式的计算值进行对比,试验值略高于规范公式的计算值.分析表明,水平灰缝处的砂浆对灌芯混凝土砌块砌体的抗剪性能及抗剪强度影响较小,而竖向灰缝处的砂浆有利于改善灌芯混凝土砌块砌体的抗剪受力性能,影响砌体的抗剪破坏形态,进而提高砌体的抗剪强度.     

Preparation and Characterization of the Covalent-Integrated Poly（lactic acid） and Scrap Leather Fiber Composites

Scrap leather fibers (SLFs) modified with active silane containing epoxide groups were incorporated into poly(lactic acid) (PLA) modified by vinyl trimethoxysilane, i.e., the PLA/SLF composites were prepared for bio-composites by solvent compounding technology in this article. The effects of silane coupling agents on the structures of PLA and SLF molecules were examined, and the mechanical properties and thermal stability of PLA/SLF composites were also measured. The results of Fourier-transform infrared spectroscopy (FTIR) had proved that silane had been incorporated successfully to PLA and SLF molecules by means of the solvent technology. Scanning electric microscopy (SEM) was used to investigate both the changes in shapes between the pristine SLFs and the treated SLFs and the microscopic structures of composites. According to SEM results, it was shown that there were some significant differences between the untreated and treated SLFs, and a double continuous phase structure had occurred in PLA/SLF composites due to the excellent dispersion of SLFs in matrix. The addition of the treated SLFs into PLA resulted in a distinct improvement of the impact and tensile strengths. When the mass fraction of the treated SLFs was 15%, the notched impact strength and tensile strength of PLA/SLF bio-composites were improved by 34.4% and 21.2% compared with the pristine PLA, respectively. Additionally, with the increase of the modified SLFs content, the thermal stability of PLA/SLF bi-composites was apparently improved. The macroscopic properties of bio-composites were found to be strongly dependent on their components, concentration, dispersion and resulted morphological structures.     

Effectiveness of different orthoses on joint moments in patients with early knee osteoarthritis: Lateral wedge versus valgus knee bracing

The purpose of the study was to test the biomechanical differences between a lateral wedge and a valgus knee bracing on the knee joint moment during walking in patients with early stage of medial compartment knee osteoarthritis (OA). We conducted a crossover randomized design to compare gait parameters of 32 patients (with early stage medial compartment knee OA) in three different conditions during walking: with a custom-made lateral wedge of 5° (in standard shoes), with a valgus knee bracing (in standard shoes), and with control condition (in standard shoes). Both two-orthose conditions showed decreased loading patterns (knee adduction moment and knee adduction angular impulse) on the knee joint in dynamic condition (statistic probability P < 0.05). The decreased loading on OA knee in wedge condition was associated with a laterally shifted location of centre of pressure and increased ankle valgus degree and moment at the same foot (P < 0.05). It was not found significant differences in loading of the knee between these two-orthose conditions. These results indicated that, under dynamic condition, patients wearing lateral wedge and valgus knee bracing showed changes of moments on knee joints. Lateral wedge was as effective as valgus knee bracing in the treatment of early stage of knee OA.     

当前国际经济形势下出口型中小企业的破局研究

本文通过研究当前世界经济形势接连出现不利于我国中小企业出口贸易的情况,重点针对企业自身如何构建破局思维,在思维形成的基础上实施具体破局的营销策略及措施,为中小企业成功保持出CI势头做了一些探讨性的研究,对中小企业建立正确的战略思维与策略行为具有现实的指导意义。     

交通运输信息融合功能模型

综述一般信息融合功能模型和交通运输信息融合应用的进展,指出这两个方面的联系和差异.针对交通运输应用的信息本质和功能特性,提出交通运输信息融合的一般定义,并建立了交通运输信息融合功能模型.模型对信源引入机器信息与认知信息的划分,提出了分属机器信息和认知信息两个层次的采集校验融合、状态特征融合、预测评估融合、规划设计融合和综合决策融合五级信息融合功能,提供了五级融合功能的三种应用模式,实现了不同交通运输应用功能与信息操作功能的衔接,与一般多传感器数据融合功能模型具有统一性.论文还以交通拥挤管理问题为例,给出了相应的信息融合功能模型.     

驾乘舱非均匀热环境中人体热生理响应与主观热感觉相关性分析

明确乘员生理热响应与热感觉相关性是实现舱内热环境智能化控制的迫切需求.为探究人体热感觉与其生理热调节的关系,搭建了非均匀热流耦合的乘员舱气候试验平台,进行主观热感觉评分,通过热感觉和热舒适试验建立双标尺的人体热感觉评价体系,接着,通过受试者穿戴传感器,测得脉率、血氧饱和度、血压和皮肤温度等生理热响应.对试验数据进行处理...