一种基于深度图像的静态手势神经网络识别方法

静态手势识别是以手势驱动的人机交互系统的核心技术。针对静态手势识别问题,提出了一种基于深度图像进行静态手势识别的方法。为了消除静态手势识别过程中的平移、旋转和缩放不变性,提取手势轮廓的Hu不变矩,并以Hu不变矩作为特征构建静态手势深度感知神经网络模型,以此实现对静态手势进行分类识别。在VisualStudio的开发环境下实现了对该方法的验证,取得了良好的效果,并与传统的模板匹配法与基于卷积神经网络的深度学习方法作比较,静态手势识别准确率总体可达95%,识别效率高,能满足实时性要求。     

Chemical structure and remarkably enhanced mechanical properties of chitosan-graft-poly(acrylic acid)/polyacrylamide double-network hydrogels

The novel double-network (DN) hydrogels were prepared using the chitosan-g-poly(acrylic acid) as the first network, and polyacrylamide as the second. The effects of the concentrations of the second network on chemical structure, intermolecular interactions and mechanical properties for the DN gels were investigated. The DN hydrogels had decreased swelling capacities and significantly improved glassy modulus and strength with the increase of the acrylamide concentration, owing to the enhanced intermolecular interaction and physical entanglement, and reduced molecular motion. It is worth noting that DN hydrogels with 5.50 mol/L acrylamide content had the greatest mechanical strength and still relatively high water content (~82 wt%), resulting from the effectiveness of the intermolecular penetration and intermolecular interactions between two independent polymer networks. Therefore, the reported novel chitosan-based DN hydrogels exhibit good potentials in some applications, for example biomedical engineering applications.     

内置轻钢桁架混凝土组合剪力墙抗震性能试验研究

将冷弯薄壁型钢桁架配置在普通钢筋混凝土剪力墙中代替钢筋而形成轻钢桁架混凝土组合剪力墙。为研究该类墙体的抗震性能,对两组共6个内置轻钢桁架混凝土组合剪力墙进行拟静力试验,研究轴压比和斜撑体积配钢率对其滞回性能、变形性能、刚度退化以及耗能能力的影响。对比了低矮剪力墙和中高剪力墙的位移延性和耗能能力。结果表明：轴压比对该类剪力墙的变形能力和耗能能力均不利,应予以控制;斜撑体积配钢率对提高低矮墙的延性、耗能能力效果明显,但对承载力的提高作用较小;对中高剪力墙,斜撑体积配钢率的增加,对其耗能能力不利。     

关于路边停车规划的几个问题

首先探讨了路边停车地位与作用 ,认为 :路边停车是停车系统中不可或缺的一部分 ,但只能作为路外停车的补充和配合 ,要依据不同的城市、区位特征来确定路边停车的地位与作用。接着分析了制约路边停车的道路条件、交通条件、路外停车设施、交通管理水平等制约因素。最后从系统性、协调性、动态性、可操作性 4个方面阐述路边停车规划应遵循的原则     

钢筋混凝土框架结构CAD系统中梁的实用选筋计算方法

在钢筋混凝土框架结构计算机辅助设计(简称CAD)系统中,计算机如何自动选择钢筋的配置方式,是关系到CAD系统的实用性及提高CAD能力的一个重要课题.本文提出一种具有能运用专家知识和经验进行推理判断功能的框架梁实用选筋计算方法.该方法计算简便,计算结果符合构造要求和工程习惯,有较大实用价值.     

项目的财务分析与投资评估

要给投资评估提供条件,项目编制工作就应当适应于财务和经济分析的要求.基本上,在一开始进行项目设计时,就必须同时进行财务分析,而这只有在财务分析人员从开始阶段就参加到可行性研究小组中才有可能做到.     

玻璃纤维－环氧树脂预浸料质量控制方法的研究

利用化学分析、红外光谱(IR)、热分析(DSC、TGA)、体积排斥色谱(SEC)等分析技术研究了S2高强玻璃纤维-环氧树脂预浸料在高温(45℃)储存条件下化学特性的变化规律,从而为选择预浸料的质量控制方法提供依据。      

光控石墨炉原子吸收光谱法测定钛的研究

研究了钛原子吸收光谱的两个基本问题：钛吸收线的特征和钛原子的生成和消失．考察了石墨管的基质材料、灰化温度、原子化温度、升温技术和基体效应的影响．建立了全热解石墨管、Ca（NO3）2－NH4F混合基体改进剂,光控快速升温石墨炉原子吸收光谱测定钛的方法,特征质量为39pg/0.0044A。     

SILEX检测与验证

评述了首次实现星问光学连接的欧洲空间局(ESA)的SILEX计划的检测与验证方法,相信对我国星间光通信技术的研究与发展具有一定的促进作用。     

Investigation on Technique for Ethylene Preparation via Catalyzed in Fluidized Bed Dehydration of Bioethanol

The V-P/HZSM-5 catalyst was prepared by impregnation method using HZSM-5 zeolite as the carrier.Its catalytic activity was examined on dehydration of bio-ethanol in a self-designed fluidized bed reactor to manufacture ethylene.The effects of dehydration conditions on catalytic behaviors were investigated.The results showed that the V-P/HZSM-5 catalyst demonstrated good activity for bio-ethanol dehydration.Both bio-ethanol conversion and ethylene selectivity were over 90% under the following reaction conditions:a P/V atomic ratio of 7.50 a catalyst calcination temperature of 300℃,a reaction temperature of 220℃,a bio-ethanol flow rate of 0.1 mL/min,and a catalyst dosage of 3.0 g.Furthermore,the catalyst exhibited excellent catalytic stability and regeneration capability.