摘要：随着时代的发展、民众日常生活的变革，曾以家庭为核心的年俗文化，正在不断融入现代城市生活，进入更为广阔的公共文化空间。2024年春节前后，笔者对北京西北郊“三山五园”历史文化遗产中的颐和园、圆明园开展田野调查。颐和园、圆明园承载了深厚的历史文化记忆，两园在春节文化空间构建中展现的创意实践，为探索传统节俗文化的当代价值提供了鲜活案例。调查结果显示，市民对公园的需求已从单纯的风景欣赏转向更高层次的精神文化体验。年轻人对春节活动的参与方式更加注重互动性与创新性，而中老年游客更关注传统文化的沉浸体验。这一动态变化反映了中国社会在新时代背景下，春节文化不断适应多元需求、焕发新生的趋势。

摘要：This paper describes the general optimization design method of Solar-Powered Unmanned Aerial Vehicle which priority considering propulsion system planning. Based on the traditional solar powered aircraft design method, the propulsion system top-level target parameters which affect the path planning are integrated into the general optimization design. According to the typical mission requirements of Solar-Powered Unmanned Aerial Vehicle, considering the design variables such as wing area, aspect ratio, design mission date and so on, the general optimization is carried out with the minimum aircraft weight as the optimization objective. The influence of wing area and aspect ratio on the optimal design results is analyzed and compared with the traditional design method. The results show that the general design method of Solar-Powered Unmanned Aerial Vehicle for priority considering propulsion system can greatly reduce the electricity demand of energy storage battery, greatly reduce the aircraft weight of Solar-Powered Unmanned Aerial Vehicle.

摘要：归纳提炼了大学物理实验智慧教学的4个关键要素——教学管理、教学设计、教学资源、评价体系,探究并设计了M DRE教学实践模式.结合理论与实证研究,深入分析了物理实验智慧教学中的教育管理模式,构建了多方位优化视角的智慧型学习资源平台,以及量化与质化相结合的综合教学教研评价机制,一定程度上深化拓展了实验教学的设计理念和方法,为推动未来教育的高品质和可持续发展提供了有价值的参考和借鉴.

摘要：With the continuous escalation of modern war,soldiers need to transport more combat materials to the combat *** limited load-bearing capacity of soldiers seriously restricts their carrying capacity and *** is urgent to develop a power-assisted exoskeleton robot suitable for individual *** the past,most power-assisted exoskeleton robots were driven by *** driving method has an excellent power-assisted effect,but the endurance is often *** view of this shortcoming,this study designed an ankle exoskeleton robot based on an active-passive combined drive through simulation analysis of human *** used OpenSim software to simulate and verify that the addition of spring could achieve a good *** the same time,according to the gait characteristics of the human body,the gait planning of an exoskeleton robot was carried ***,theoretical analysis explained that the cooperation among spring,motor and wearer could be realized in this ***,the assisting ability and driving coordination of the active-passive combination driven ankle exoskeleton robot were verified through experiments.

摘要：以具备不同动力学参数电动汽车组成的异质车队作为研究对象,以满足混合异质车流的跟车性、安全性与舒适性等性能为目标,提出了一种利用模糊控制理论改变原本MPC固定权重的协同式自适应巡航控制系统(CACC)。通过构建协同式自适应巡航控制系统的车辆间纵向动力学模型,搭建离散状态空间等式,创建相应的目标优化函数并进行约束求解,设计模糊规则改变MPC相关性能的固定权重系数,最后通过构造Simulink和CarSim的联合仿真模型进行测试。试验结果表明,在跟随行驶工况下,改进后的模糊MPC控制算法比传统的MPC控制效果更明显,能更好响应异质车队跟车性、安全性与舒适性等性能,更满足实际车流行驶情况。

摘要：为实现液氢储罐中真空多层绝热结构更优异的绝热性能,在以往三密度区或四密度区的基础上,提出了一种绝热结构逐层连续变密度优化方法,对其辐射屏层间距布置进行优化。确定了耦合蒸气冷却屏(VCS)和VCS内引入仲正转化后的最优层间距布置,分析了连续变密度优化对温度和热流密度分布的影响,并与采用分段变密度方法的结果进行了对比。结果表明:在绝热结构总厚度一定的情况下,优化后冷边界附近的屏间距显著增加,从而降低了冷边界附近的固体导热和热边界附近的辐射换热。对于仅耦合VCS的绝热结构,当VCS设置在第3层辐射屏时,优化效果最显著,最小热流密度从0.2492 W·m^(-2)降至0.2088 W·m^(-2),降幅达16.2%;优化后VCS最佳安装位置从第18层调整至第14层,相对位置从0.51移至0.56。当VCS内引入仲正转化时,VCS在第2层辐射屏时优化效果最为显著,热流密度较优化前降低了22.0%。研究了连续变密度优化方法对绝热性能的影响规律,为多层绝热结构的变密度优化设计提供支撑。

摘要：Proteins are one of the major classes of biomolecules that execute biological functions for maintenance of *** kinds of nanostructures self-assembled from proteins have been created in nature over millions of years of evolution,including protein nanowires,layers and *** protein nanostructures can be reconstructed and equipped with desired new *** from and manipulating the self-assembly of protein nanostructures not only help to deepen our understanding of the nature of life but also offer new routes to fabricate novel nanomaterials for diverse *** review summarizes the recent research progress in this field,focusing on the characteristics,functionalization strategies,and applications of protein nanostructures.

摘要：由于网络环境攻击手段的多样性,导致误报率较高,设计一种基于改进随机森林算法的风电场通信网络攻击预警方法。融合卷积神经网络与随机森林算法提取风电场通信网络攻击特征。引入攻击频次指标和滑动窗口来动态评估实际攻击次数占比,并量化攻击频率指数(Attack Frequency Index,AFI)作为预警阈值,结合所构建的预警指标体系与预警等级,实现风电场通信网络攻击预警。实验结果表明,设计方法的平均误报率仅为7.93%,平均响应时间为29.67 ms,且波动较小,显示出更高的稳定性和可靠性。

摘要：为了解决传统火灾检测系统在森林、复杂的山区地形等场景下可能会出现误报或漏报的问题,文中设计了一种用于火灾检测的X波段辐射计系统,其主要包括两部分,分别是前端高定向阵列天线以及直检型辐射计通道。阵列天线经实测,增益达到21.44 dB,3 dB波束宽度小于15°,辐射计通道包括低噪声放大器模块、带通滤波器模块和对数检波模块,该通道具有体积小、高集成度、低功耗等特点。实验结果表明,系统能够探测不同环境下温度的辐射能量,并最终以电压的方式呈现。

摘要：As a unique artistic form of both young and old, urban sculpture art plays a finishing touch to the urban image of the new era, gradually becoming the point to enhance the overall image of modem city. For public art sculpture gradually integrates into modem life, the attention of it is also increasing. A city needs good sculpture to heighten the atmosphere and shows cultural deposits, in the meantime, excellent urban sculpture will also greatly enhance the influence of cultural landscape and public art, effectively creating urban culture brand image and enhancing the city＇ s comprehensive charm.