摘要：A mechanical metamaterial that has a tailorable coefficient of thermal expansion(CTE)is promising for guaranteeing the reliability of electrical and optical instruments under thermal *** growing research on the design and manufacturing of metamaterials with extraordinary CTEs,it remains challenging to achieve a nearly isotropic tailorable CTE while ensuring a sufficient load bearing capacity for applications,such as mechanical supporting *** this research,we propose a type of bi-metallic lattice whose CTE is artificially programmed from positive(75 ppm/K)to negative(−45 ppm/K),and whose equivalent modulus can be as high as 80 *** bi-metallic lattice with a tailorable CTE in two orthogonal directions can be readily assembled without special modifications to construct large-scale planar structures with desired isotropic CTEs.A theoretical model that considers the actual configuration of the bi-metallic joint is developed;the model precisely captures the thermal deformations of lattice structures with varied geometries and material *** by our theoretical design method,planar metallic structures that were manufactured using Al,Ti,and Invar alloy were experimentally characterized;the structures exhibited outstanding performance when compared with typical engineering materials.

摘要：At present, whether internally or abroad, whether in the theory or business, there is a lack of a unified understanding about the basic concepts of structural system and theoretical category of enterprise business model, and its theoretical analysis framework has not been built up, it is the exploratory phase of the model research in the mass. This study aims to analyze the formation mechanism, action mechanism, and evolution mechanism about the business model from the perspective of structure, and designs the enterprise business model architecture and forms a system, besides, explores approaches and strategies about enterprise carrying out business model innovation, and does beneficial bedding in order to use and improve the theoretical system in the process of the enterprise management practice. The significance of this study is to provide analytical methods and tools for the business model questions in the enterprise management practice. This paper firstly defined the connotation of enterprise business model and summarized the seven characteristics of the corporate business model. On the basis of outlining the enterprise business model design theory, the structural design of the corporate business model is mainly discussed. This paper designed the structure of the business model on modular perspective, proposed four constituent units and nine elements of enterprise business model structure system. Through the design of the enterprise business model structure and analysis of the elements that constitute structure, provide the basis for the transformation of innovative enterprise business model, or both enterprise business models, avoid the lack of elements of the enterprise business model structure and lead to business failure. Finally, the paper concludes with the five core strategies for the implementation of the enterprise business model design.

摘要：波普艺术作为一种现代艺术,同时也是服饰设计中的艺术元素,其用色大胆,多为采用新颖的拼接方法,以搬运大众社会图形、复制生活原貌作为创作的基本元素。设计师将波普理念与服饰设计相结合,使服装呈现多元化、大众化的发展模式。

摘要：[目的]运用基于数据驱动的离散优化思路,对翼身融合水下滑翔机舱体−骨架耦合结构进行优化设计。[方法]首先,采用一种Kriging辅助的离散全局优化(KDGO)算法解决计算代价昂贵的黑箱问题,该算法采用一种新颖的加点策略来捕获性能较好的离散样本点,并在该加点策略中引入多起点数据挖掘方法,主要包含多起点优化、投影、采样和选择4个阶段。其次,建立骨架−舱体耦合结构的参数化模型,并对耦合结构进行吊放变形和深水受压工况的有限元分析。接着,以浮−重比为目标,把骨架结构、舱体结构的强度与稳定性指标作为约束,同时考虑外形和舱体之间的干涉以及骨架和舱体的耦合关系,建立整体耦合结构的离散优化数学模型。最后,将离散优化算法与耦合结构仿真相结合,搭建整体优化框架,同时采用KDGO算法进行200次函数评估,并对实验设计(DOE)采样阶段最优可行点和优化后全局最优点进行对比。[结果]结果显示,全局最优点所对应耦合结构的浮−重比提升了近40%,结果令人满意。[结论]所做研究可为翼身融合水下滑翔机舱体−骨架耦合结构的设计提供参考。

摘要：针对OFDM系统传统的同相、正交支路（IQ）不平衡的时域补偿算法所存在的时延及系统开销问题，提出了一种无反馈的IQ不平衡时域补偿算法，该算法可在接收端对发射机和接收机分别产生的IQ不平衡进行联合补偿。同时设计了特殊结构的训练序列，以实现信道和IQ不平衡参数的联合估计。仿真表明，该算法仅需两个正交频分复用（OFDM）训练符号即可达到较好的系统误码性能，因此是一种高效且无需反馈的OFDM系统发射机／接收机的IQ不平衡补偿算法。

摘要：本文给出并详细设计了地方高校工科数学过程考核和终结考核改革的若干具体办法。论述了考试考核电子化,提出了试题库建设中计算题目难度系数的一个合理且切实可行的方法。

摘要：为同时提升车辆的计算迁移率和边缘计算服务器的资源利用率,提出了一种基于交通流量预测的车联网边缘计算迁移方案。首先通过设计考虑任务优先级的计算迁移率和资源利用率效用函数,将问题建模为双目标优化问题;然后将问题转化为车辆与边缘计算服务器之间的资源双边拍卖问题,再通过设计交通流量信息感知的报价函数,采用McAfee拍卖算法,进而完成边缘计算迁移。仿真结果表明,通过交通流量预测信息的辅助,所提方案能有效提高车联网的边缘计算迁移率和资源利用率。

摘要：大规模多领域的氢能应用会对电力负荷的规模、结构及分布等产生影响,进而对电源规划带来新的挑战。为此,文中提出一种考虑跨领域氢负荷的电源低碳规划模型。首先,计及工业、交通和供热领域的氢负荷,构建包含常规火电机组、碳捕集机组、新能源机组以及氢能系统的电-氢系统结构,并基于系统动力学理论对多领域的氢需求进行预测;其次,引入阶梯碳交易机制,在满足系统常规约束和氢能设备约束的前提下,考虑电、氢负荷需求,建立以投资、运行、碳交易以及弃电成本之和最小为优化目标的电源低碳规划模型;最后,以中国西北某地区的实际数据为例进行算例分析。结果表明,引入氢负荷和碳捕集电厂后的电源低碳规划模型能够优化电源结构、提高能源利用效率、降低系统碳排放量。

摘要：现有无人机集群的协同决策设计所依据的信息共享缺乏对无人机之间通信能力的合理假设。针对电量、载荷和路线约束下的无人机集群多目标救援问题,结合无人机飞行路线,考虑通信能力对无人机之间信息共享的限制。首先,将问题建模成部分可观测马尔可夫决策过程;然后,利用循环神经网络提出基于深度强化学习的能够适应通信拓扑结构不断变化的分布式救援策略。仿真结果表明,所提策略相较于其他策略在通信受限的情况下具有更佳的分布式救援性能,无人机数量和无人机通信能力需要依据救援场景进行联合设置方能达到无人机集群救援性能和使用成本的最佳折中。

摘要：随着能量收集无线传感器网络在环境监测、工业自动化、战场侦察等实时通信场景的广泛应用,多址接入需要同时考虑数据分组严格的传输时限特性以及传感器节点的能量收集特性。由于节点互干扰、传输紧迫性及能量储存度等因素的固有耦合,此多址接入的设计和优化相比于仅需考虑数据分组到达特性的传统多址接入具有更大挑战性。首先,设计各节点接入行为依赖于全局传输紧迫性和剩余能量的集中式接入协议;然后,考虑集中式接入具有难以承受的控制开销,设计各节点接入概率仅依赖于本地传输紧迫性和剩余能量的分布式接入协议。以最大化网络吞吐率为优化目标,使用马尔可夫决策过程对集中式接入分别进行考虑所有数据分组信息的完整建模和仅考虑队首数据分组信息的简化建模,并基于逆向归纳算法求解两种建模的最优集中式策略;最后,使用分布式马尔可夫决策过程对分布式接入协议进行简化建模,并基于马尔可夫策略搜索方法提出ε-最优分布式策略。仿真结果验证了简化建模的有效性和所提出策略相较于其他策略的性能优越性。