摘要：A prototype thick-GEM-based cooling storage ring external-target experiment(CEE) time projection chamber(TPC) is constructed and tested with the pulsed ultraviolet laser beams. The results indicate that the prototype TPC has a good performance in three-dimensional track resolution. In X direction the position resolution is about 0.2 mm, and in Y direction the position resolution is about 0.5 mm. The results also determine that the energy resolution is about 5.4%, which achieve the requirements of the CEE experiment and can be used to study the nuclear state equation and the quantum chromo dynamics.

摘要：为了能够准确地掌握喷油器的燃油喷射过程和喷射规律,以研究和改进燃烧室及气道,组织好燃油的燃烧过程,降低油耗和减少尾气排放,设计了一种基于磁电式针阀升程传感器和以AT89C51单片机为核心的智能化针阀升程测试系统。试验证明,该测试系统灵敏度高,响应速度快,实现了快速、精确、可靠地显示喷油器的各阶段燃油喷射过程的目的。

摘要：设计变电站远程智能巡检图像目标快速识别算法,通过高效的目标识别性能,提升变电站巡检水平。利用无人机搭载相机,采集变电站远程智能巡检图像,通过小波变换方法滤波处理所采集的智能巡检图像。利用自适应阈值分割方法,分割已滤波处理的变电站远程智能巡检图像,将智能巡检图像划分为前景图像与背景图像。以智能巡检图像的前景图像为基础,构建高斯差分金字塔,提取图像的SIFT特征。依据所提取智能巡检图像的SIFT特征构建样本集,作为特征加权支持向量机的输入,利用特征加权支持向量机输出目标快速识别结果。实验结果表明,该算法可以快速识别变电站远程智能巡检图像中的目标,目标识别时间低于500 ms。

摘要：目的:在实际工程服役过程中,纤维增强塑料(FRP)约束混凝土柱在遭遇极限荷载前往往已经经历了长时间的轴压荷载作用。因此,相比其短期力学性能,本文旨在研究FPR约束混凝土柱在长期荷载作用后的力学性能。创新点:1.考虑长期轴压荷载作用,提出一种轴压作用下圆形截面FRP约束混凝土柱的长期变形分析模型;2.提出了长期轴压作用后的FRP约束混凝土本构模型,从本构关系的角度描述两个方面的影响机理。方法:运用混凝土和FRP徐变的长期变形分析迭代计算方法(图3)。结论:1.提出的长期变形分析模型实现了对FRP约束混凝土柱任意目标时刻的应力和应变状态的高效、准确预测;2.将提出的本构模型嵌入有限元软件中,有效地实现对长期轴压作用的考虑;3.基于Open Sees有限元软件,验证了长期变形分析模型和本构模型的有效性和准确性。

摘要：Dictionaries should present business encyclopedic knowledge as well as business linguistic knowledge. This paper, taking Incoterms for international trade as an example （with ＂CIF＂ as the case for analysis）, introduces 7 types of dictionary structures （overall structure, frame stzucture/megastrncture, macrostructure, microstzucture, distribution structure, cross-reference stzucture/mediostrncture and access structure）, summarizes the knowledge system of international trade terms （consisting of ＂international trade＂, ＂sets of rules of international trade terms＂, ＂Incoterms 2010＂, and ＂CIF＂）, and illustrates the methods of systematically presenting the knowledge system of international trade terms through dictionary structures in an English-English-Chinese bilingualized business English learners＇ dictionary with Oxford Business English Dictionary for Learners of English （New Edition） as a reference. Such presentation is intended for enhancing business English learners as dictionary users to grasp the knowledge of international trade terms as a whole.

摘要：肢障者因身体先天或后天残疾,下肢和腰椎失去行动能力,使用移位机可将其托起并移动,代替人工帮助。运用测量法、行为观察法和访谈法研究了肢障者与移位机之间的人机关系,分析了肢障者的行为和生理特性对移位机功能与尺寸设计的影响,获得了肢障者人体尺寸和行为活动能力等方面的信息,并对移位机的功能、结构与形态尺寸进行了创新设计,使得移位机的功能与形态尺寸更符合肢障者的需求。

摘要：随着在线社区的兴起,如何在社区中开展网络营销活动,不断提升消费者的品牌认同感,通过品牌的有效定位以占领更多的消费者心智份额日益受到越来越多品牌的关注和重视。本文将基于RAS信息接收-接纳(Receipt-Accept-Sample)模型,针对不同类型的消费者群体从社区平均心智份额与社区消费者心智份额两个角度探讨基于在线社区的消费者品牌认同提升效果,并根据品牌发布广告的信息复杂度与信息强度来揭示广告信息特征对消费者品牌认同提升效果的影响,进而提出在线社区消费者品牌认同提升的品牌定位实施策略建议。研究发现:(1)在线社区消费者的平均心智份额呈现曲折上升态势,品牌有必要适时调整支撑品牌定位的营销组合策略;(2)消费者的心智资源不会被某一品牌所独占,品牌无法获取所有消费者的认同;(3)品牌定位应是简单明了且易于理解;(4)在提升消费者的品牌认同时,应基于消费者个性展开提升而非消费者的能力与意识;(5)在线社区消费者品牌认同提升过程中始终存在被竞争品牌攻击与反超的风险,品牌可能会流失已经夺取的心智资源;(6)即使品牌重启新的品牌定位战略,也无法全部挽回因竞争品牌反击而遭受的损失。本文在验证以往品牌认同与品牌定位理论相关结论同时,也获得了现有理论中未曾揭示的研究发现,为品牌开展有效品牌定位,扩大消费者心智份额,提升在线社区消费者品牌认同提供了借鉴。

摘要：香溪长江公路大桥主桥为主跨519m(计算跨径)的中承式钢桁架拱桥。该桥设计过程中对两铰拱和固端拱拱肋结构体系进行比较,最终选择采用固端拱方案。针对传统承压传剪式钢-混混合拱脚连接构造的缺点,提出一种完全承压式钢-混复合拱脚连接构造。该构造由厚承压板格构和弦杆外预应力系统组成,通过在弦杆外、承压板顶施加预应力,将拱肋弦杆的弯矩转换为轴力并通过埋置于拱座内的预应力锚梁平衡;弦杆轴力和预应力通过端部的承压板格构传递至拱座。该构造从根本上改变了拱脚-拱座界面的受力状态,使最不利荷载组合下拱脚截面、承压板截面从部分受拉状态改善至全截面受压状态,弦杆对应拱座截面受力为局部承压。

摘要：In maxillofacial surgery, there is a significant need for the design and fabrication of porous scaffolds with customizable bionic structures and mechanical properties suitable for bone tissue engineering. In this paper, we characterize the porous Ti6Al4V implant, which is one of the most promising and attractive biomedical applications due to the similarity of its modulus to human bones. We describe the mechanical properties of this implant, which we suggest is capable of providing important biological functions for bone tissue regeneration. We characterize a novel bionic design and fabrication process for porous implants. A design concept of “reducing dimensions and designing layer by layer” was used to construct layered slice and rod-connected mesh structure (LSRCMS) implants. Porous LSRCMS implants with different parameters and porosities were fabricated by selective laser melting (SLM). Printed samples were evaluated by microstructure characterization, specific mechanical properties were analyzed by mechanical tests, and finite element analysis was used to digitally calculate the stress characteristics of the LSRCMS under loading forces. Our results show that the samples fabricated by SLM had good structure printing quality with reasonable pore sizes. The porosity, pore size, and strut thickness of manufactured samples ranged from (60.95± 0.27)% to (81.23±0.32)%,(480±28) to (685±31)μm, and (263±28) to (265±28)μm, respectively. The compression results show that the Young’s modulus and the yield strength ranged from (2.23±0.03) to (6.36±0.06) GPa and (21.36±0.42) to (122.85±3.85) MPa, respectively. We also show that the Young’s modulus and yield strength of the LSRCMS samples can be predicted by the Gibson-Ashby model. Further, we prove the structural stability of our novel design by finite element analysis. Our results illustrate that our novel SLM-fabricated porous Ti6Al4V scaffolds based on an LSRCMS are a promising material for bone implants, and are potential

摘要：宜昌香溪长江公路大桥主桥为钢桁架全推力中承式无铰拱桥,拱轴计算跨径为519m。拱肋采用空间变截面桁架结构,拱轴线采用悬链线形,拱轴系数为2.0。桁架拱采用2片主桁,主桁采用柏式桁架,主桁节点采用焊接整体节点。拱脚采用厚承压板格构+预应力的钢-混结合段构造。拱上立柱采用钢箱排架结构。桥面梁采用格子梁体系,在钢纵、横梁顶面布置焊钉与钢筋混凝土桥面板形成结合梁结构,桥面结构采用纵向部分固结+纵向限位+横向多点拉索减震的支承方式。吊杆采用整束挤压钢绞线吊杆。拱座采用分离式钢筋混凝土结构,拱座基础采用明挖扩大基础。上部结构安装采用斜拉扣挂、缆索吊装系统,拱肋主桁采用节段整体吊装,两岸对称悬臂拼装的方式架设。