摘要：Developing effective and practical electrocatalyst under industrial electrolysis conditions is critical for renewable hydrogen ***,we report the self-supporting NiFe LDH-MoS_(x) integrated electrode for water oxidation under normal alkaline test condition(1 M KOH at 25℃)and simulated industrial electrolysis conditions(5 M KOH at 65℃).Such optimized electrode exhibits excellent oxygen evolution reaction(OER)performance with overpotential of 195 and 290 mV at current density of 100 and 400 mA·cm^(-2) under normal alkaline test ***,only over-potential of 156 and 201 mV were required to achieve the current density of 100 and 400mA·cm^(-2) under simulated industrial electrolysis *** significant degradations were observed after long-term durability tests for both *** using in two-electrode system,the operational voltages of 1.44 and 1.72 V were required to achieve a current density of 10 and 100 mA·cm^(-2) for the overall water splitting test(NiFe LDH-MoS_(x)/INF||20%Pt/C).Additionally,the operational voltage of employing NiFe LDH-MoS_(x)/INF as both cathode and anode merely require 1.52 V at 50mA·cm^(-2) at simulated industrial electrolysis ***,a membrane electrode assembly(MEA)for anion exchange membrane water electrolysis(AEMWEs)using NiFe LDH-MoS_(x)/INF as an anode catalyst exhibited an energy conversion efficiency of 71.8%at current density of 400 mA·cm^(-2)in 1 M KOH at 60℃.Further experimental results reveal that sulfurized substrate not only improved the conductivity of NiFe LDH,but also regulated its electronic configurations and atomic composition,leading to the excellent *** easy-obtained and cost-effective integrated electrodes are expected to meet the large-scale application of industrial water electrolysis.

摘要：针对无人机编队内避碰问题,提出一种可实时机间避碰以及多碰撞冲突管理的多无人机协同航迹规划方案。通过对UAV编队避碰问题进行分析,采用分布式模型预测控制(decentralized model predictive control,DMPC)方法,将其转换为滚动在线优化问题。设计了避碰管理单元,采用交互图更新机制解决多碰撞管理问题,运用基于角度变化的协同避碰规则,解决了分布式避碰问题的动作一致性问题。仿真结果表明,该方案可以有效解决4架无人机间多碰撞冲突问题,同时代价更小。

摘要：针对多数基于GPRS无线网络的数据远传系统中数据中心IP地址动态变化的问题,提出一种新的解决方案。该方案克服了传统实现方案需额外申请动态域名的缺点,简化了下位机程序设计,实现了GPRS终端与数据中心的正确连接,保证了系统稳定性、效率、成本间的平衡。

摘要：针对无人机飞行过程中避障问题,提出了一种基于模型预测控制的无人机避障路径规划方法。通过对无人机平台模型进行分析,构造了无人机状态空间预测模型。为保证路径规划过程输出的平稳性,采用一阶指数变化形式作为无人机飞行路径的参考轨迹。设计了预测模型调整策略,并给出了参数调整流程,以能力-时间组合最优为目标,建立了无人机避障路径优化模型,采用有限时域优化的滚动优化算法对无人机避障优化模型进行了求解。算例仿真结果表明,该算法可有效解决无人机飞行路径的避障问题。

摘要：针对有/无人机编队对地攻击作战行动方案规划求解问题,提出一种基于马尔可夫决策过程(MDP)模型的求解策略。首先,依据有/无人机编队对地攻击兵力组成和行动特点,给出了MDP模型中状态集与行动集的形成方法,设计了MDP模型中状态转移概率计算方法和报酬函数,考虑资源、时间等约束条件,进一步建立了行动方案生成MDP优化模型;其次,对蚁群算法的路径选择概率和信息素更新策略进行了改进,并应用于MDP优化模型求解;最后,进行了仿真分析,结果表明,提出的方案能够有效地求解有/无人机编队行动方案生成问题,求解过程速度快,解质量较高。

摘要：提出一种路径规划与轨迹规划相结合的多无人机实时航迹规划层次结构。首先,建立了路径规划问题模型,提出了一种连续可变步长稀疏A*算法(Sparse A~* Search,SAS)进行求解,克服了固定步长对于环境变化适应性较差的不足;其次,对于任一中间航路段,设计了基于模型预测控制((Decentralized Model Predictive Control,DMPC)思想的轨迹规划问题求解框架,综合考虑UAV飞行运动学约束、避碰约束,建立DMPC单步非线性规划问题模型;最后,对提出的层次化航迹规划方法进行了仿真验证。与传统的航迹规划方法相比,该方案均衡了解质量与实时性要求,并具有更好的适应性。

摘要：合唱艺术钢琴伴奏并置地位的具体形式有:在音型织体的基础上加强钢琴伴奏的旋律性,在音型织体的基础上陈述复调性的副旋律,在合唱人声演唱主题旋律的同时直接陈述另一个与之对应的第二主题等。本文通过对多首合唱作品钢琴伴奏的分析研究,阐释这些伴奏形式在合唱艺术中丰富而独特的表现作用。

摘要：为满足地方交通路网衔接和功能需求,泸州河东长江大桥主桥采用主跨520 m的双塔双索面混合梁斜拉桥,全长936 m,桥面总宽28.5 m(不含锚索区),近期按双向4车道布置,远期可改造为双向6车道。主桥中跨采用钢-混结合梁,由工字形钢板边主梁+混凝土桥面板组成,边跨采用π形混凝土边主梁;斜拉索采用平行钢丝斜拉索,斜拉索及其锚具分别采用PVF胶带和氧化聚合型防腐蚀技术进行长效防护,显著增强主桥的耐久性;桥塔采用钢筋混凝土门形塔,塔墩基础采用钻孔灌注桩。主桥边跨混凝土梁采用支架现浇,中跨结合梁采用单悬臂拼装架设。引桥长270 m,为与主桥桥面宽度布置保持一致,采用9孔30 m整幅混凝土连续箱梁。对主桥、引桥结构及混凝土桥面板进行计算分析,结果表明:主桥、引桥的静力和动力性能及桥面板纵、横向受力均满足规范要求。

摘要：新建安九铁路鳊鱼洲长江大桥采用两线350 km/h高铁及两线200 km/h客货共线标准建设。南汊航道桥采用主跨672 m双塔钢箱混合梁交叉索斜拉桥,北汊航道桥采用主跨2×140 m独塔竖琴式预应力混凝土梁斜拉桥,鳊鱼洲及北汊非通航孔区采用48 m简支梁桥,跨北岸大堤采用主跨100 m变高连续梁桥,南、北岸引桥除连续梁外均采用32 m、24 m铁路标准梁,基础均采用桩基础。其中南、北汊航道桥采用整幅修建,其余采用分幅修建。桥址区基岩为灰岩,岩溶发育,设计采用了预注浆及抛填片石粘土法或灌注低标号片石混凝土措施进行处理。

摘要：A novel extrusion-shearing(ES) composite process was designed to fabricate fine-grained, high strength and tough magnesium alloy. The structural parameters of an ES die were optimized by conducting an orthogonal simulation experiment using finite element software Deform-3D, and Mg-3 Zn-0.6 Ca-0.6 Zr(ZXK310) alloy was processed using the ES die. The results show that the optimized structural parameters of ES die are extrusion angle(α) of 90°, extrusion section height(h) of 15 mm and inner fillet radius(r) of 10 mm. After ES at an extrusion temperature and a die temperature of 350 °C, ZXK310 alloy exhibited good ES forming ability, and obvious dynamic recrystallization occurred in the forming area. The grain size decreased from 1.42 μm of extrusion area to 0.85 μm of the forming area. Owing to the pinning of second phase and formation of ultrafine grains, the tensile strength, yield strength and elongation of alloy reached 362 MPa, 289 MPa and 21.7%, respectively.