摘要：针对辐射屏蔽优化设计中存在的消耗时间长、优化效率低的问题,提出一种基于粒子飞行样本更新策略的动态径向基代理模型。首先采用径向基神经网络建立真实目标函数的初始代理模型,然后通过差分进化算法对代理模型进行全局寻优,然后基于代理模型寻优结果和粒子飞行样本更新策略产生新样本点,最后将新样本点加入原有样本点后重新更新代理模型并循环迭代,直至满足收敛条件。该方法以代理模型拟合精度为依据控制原有样本点向随机样本点和最优预测样本点的飞行速度,可以实现动态代理模型全局探索与局部探索的自适应平衡。为验证方法的有效性,将所提方法应用于12个数值测试函数和船用反应堆辐射屏蔽优化设计工程实例,并与其他优化方法计算结果进行对比。结果表明:对于数值测试函数,所提方法在寻优结果、样本点数量和算法鲁棒性方面均具有显著优势,对于辐射屏蔽优化设计实例,所提方法得到的中子透射率为另外两种方法的48%和8%,所需样本点数量为静态代理模型的25%,证明该方法是求解辐射屏蔽优化等昂贵优化问题的有效方法。

摘要：Rational protein design is a powerful strategy,not only for revealing the structure and function relationship of natural metalloproteins,but also for creating artificial metalloproteins with improved properties and ***(Mb),a small heme protein created by nature with diverse functions,has been shown to be an ideal scaffold for rational protein *** progress reviewed herein includes fine-tuning its native functions of O2binding and transport,peroxidase activity and nitrite reductase(NIR)activity,and rational expanding its functionalities to peroxygenase,heme-copper oxidase(HCO),nitric oxide reductase(NOR),as well as hydroxylamine *** studies have enhanced our understanding of how metalloproteins work in nature,and provided insights for rational design of functional metalloproteins for practical applications in the future.

摘要：随着我国大众消费水平的提高、国民文化层次的提升,消费者对文化消费需求越来越高,对文旅产品的要求也越来越高。文旅产品的文化内涵需要通过产品的外观形式及使用功能表现出来,高校艺术类专业将为助推文旅产品创意设计奠定基础。高校通过对文旅产品的研发探索创意设计的新路径,结合艺术类专业特性打造具有文化内涵的作品。文章阐述了从寻找“新年味”设计元素,到归纳总结高校艺术类专业如何运用相关元素进行创意设计,再到通过文旅产品输出文化内涵的研究过程,以期为高校艺术类专业文旅产品的开发创新提供有效的借鉴和启发,树立校园文化形象,推动校园文化精神建设,使高校艺术类专业在文旅产品创意设计方面有所发展。

摘要：中国改革开放以来日资企业在华发布了大量广告,为其开拓中国市场,宣传日本企业文化,逐步扩大市场份额,发挥了独特的作用。本文以1979—2007年《人民日报》刊载的日企广告为例,在认真统计和详细分类的基础上,对日企在华广告的宣传技法与经营策略做了分析。

摘要：This paper discusses the problem of design and optimization of low-energy transfer orbit with multi-body environment. A new integrative method is proposed to effectively solve the problem, in which the parameterized patched manifolds in CR3BP(circular restricted three-body problems), the shape-based method with multi-body environment, the homotopic method with multi-body environment, and the low-thrust capturing and descending algorithm with multi-body environment are all included. Firstly, the parameters describing the patched manifolds in CR3 BP are optimized until the least total absolute velocity increment has been got, including the employment of the shape-based method with multi-body environment. Secondly, the low-thrust control laws of the transfer orbit are optimized employing the homotopic method with multi-body environment that transfers the fuel optimization problem to an easier energy optimization problem. Thirdly, the low-thrust descending orbit around Mars is computed using the laws proposed in this paper. As a typical example, the Earth-Mars transfer orbit design is discussed. The results showed that the parameters describing the patched manifolds could be optimized by the DE(differential evolution) algorithm effectively; the homotopic method with multi-body environment could get the optimal value that meets the first order optimality conditions; and the low-thrust descending orbit could effectively be captured by Mars and finally become a circular parking orbit around it by the hypothesis control laws proposed in this paper. It shows that the final fuel cost is much less than the optimal transfer in the patched two-body problems. In conclusion, the method proposed in this paper could effectively solve the low-energy low-thrust optimal control problem in multi-body environment for the future deep space explorations.

摘要：在基于现场可编程门阵列(FPGA)的反应堆控制保护系统设计中,针对各种电子设备的电磁干扰,通过在硬件设计中采用信号隔离、消噪、消激和阈值调节电路等抗干扰措施,并利用软件提高抗干扰能力,实现了电磁兼容性设计,为反应堆控制保护系统提供了较强的抗电磁干扰能力,确保了反应堆的安全、可靠和稳定运行。

摘要：从特定的受众群体优势、传播优势和价格优势三个方面分析了我国学术类期刊所拥有的广告价值,并从改变办刊理念、注重成果转化、缩短出版周期和注重装帧效果等四个方面提出了学术类期刊实现广告价值的途径。

摘要：随着物联网和人工智能在智能家居领域的应用,智能家居具备了主动交互能力.针对智能家居主动交互平衡信息传递和用户体验的问题,提出面向智能家居系统主动交互设计策略.首先,通过文献研究总结了智能家居系统主动交互的发展现状,将其总结为3个特征,即交互策略逐步采用自适应场景模式、交互通道逐步转向多模态和交互程度逐步呈现低打扰度,为策略设计提供了理论支撑;其次,梳理出智能家居场景要素和不同交互模态打扰度等级,并提出了在不同场景的任务下智能家居对应的主动交互策略;最后,采用“绿野仙踪”方法在自行搭建的实验场景下进行实验,并以SUS量表和USE问卷作为评价指标,验证了所提策略的可用性和满意度.此外,构建了智能家居不同场景与主动交互打扰度的对应关系,以期为后续研究提供参考.

摘要：介绍平面连杆系统在机构综合中的基本方法 ,确定机构与连杆系统的对应关系 ,采用该方法对有杆式抽油机增程机构进行了综合 ,构造出多种有杆式抽油机增程机构和相应的平面连杆系统 ,用以增加抽油机的冲程和改进抽油机增程机构的设计。针对综合后的抽油机各个增程机构设计方案 ,作了受力分析和冲程计算 ,推导出了抽油杆增程系数和连杆驱动力增力系数计算式 ,最后在多种综合设计方案中确定出一种较好的机械增程机构。旨在为采油机械设计者提供一种有杆式抽油机的创造性设计方法和多种可行的增程机构。

摘要：分析传统灭火器的安全隐患。设计一种折扇灭火器,利用灭火器自身的气压驱动源,在喷射过程中自行打开扇叶,喷射完毕之后扇叶自行收起,能让使用者在灭火的过程中阻挡正面的火星,短距离屏蔽烟尘和有毒物质,并且通过透明扇叶更容易观察到灭火处的状况。详细介绍系统的自动展开与折叠过程,及扇叶联动环的设计。