摘要：For the evaluation of construction quality and the verification of the design of water conservancy and hydropower engineering projects, and especially for the control of dam safety operation behavior, safety monitoring sensors are employed in a majority of engineering projects. These sensors are used to monitor the project during the dam construction and operation periods, and play an important role in reservoir safety operation and producing benefits. With the changing of operating environments and run-time of projects, there are some factors affecting the operation and management of projects, such as a certain amount of damaged sensors and instability of the measured data. Therefore, it is urgent to evaluate existing safety monitoring sensors in water conservancy and hydropower engineering projects. However, there are neither standards nor evaluation guidelines at present. Based on engineering practice, this study examined some key techniques for the evaluation of safety monitoring sensors, including the evaluation process of the safety monitoring system, on-site detection methods of two typical pieces of equipment, the differential resistor sensor and vibrating wire sensor, the on-site detection methods of communication cable faults, and a validity test of the sensor measured data. These key techniques were applied in the Xiaolangdi Water Control Project and Xiaoxi Hydropower Project. The results show that the measured data of a majority of sensors are reliable and reasonable, and can reasonably reflect the structural change behavior in the project operating process, indicating that the availabilities of the safety monitoring sensors of the two projects are high

摘要：为提高光电稳瞄系统内框架结构动力学模型准确度和仿真分析效率,提出了基于多种群遗传退火算法的结构动力学模型修正方法。以某光电稳瞄系统内框架为研究对象,通过动力子结构法建立有限元模型,对比模态测试结果,采用多种群遗传退火算法及相关性分析对有限元模型进行修正,得到全局优化下内框架轴承的六向刚度值,并对修正后的模型进行了实验验证。结果表明,有限元模型与实验结果能较好地匹配,各阶模态相关性在0.8以上,频率误差在9.05%以内,计算效率提高95%以上。最终形成了高效可行的模型修正方案,为光电稳瞄系统内框架结构设计提供了重要的参考。

摘要：In recent years,with the development of synthetic aperture radar(SAR)technology and the widespread application of deep learning,lightweight detection of SAR images has emerged as a research *** ultimate goal is to reduce computational and storage requirements while ensuring detection accuracy and reliability,making it an ideal choice for achieving rapid response and efficient *** this regard,a lightweight SAR ship target detection algorithm based on YOLOv8 was proposed in this ***,the C2f-Sc module was designed by fusing the C2f in the backbone network with the ScConv to reduce spatial redundancy and channel redundancy between features in convolutional neural *** the same time,the Ghost module was introduced into the neck network to effectively reduce model parameters and computational complexity.A relatively lightweight EMA attention mechanism was added to the neck network to promote the effective fusion of features at different *** results showed that the Parameters and GFLOPs of the improved model are reduced by 8.5%and 7.0%when mAP@0.5 and mAP@0.5:0.95 are increased by 0.7%and 1.8%,*** makes the model lightweight and improves the detection accuracy,which has certain application value.

摘要：黄嘌呤氧化酶(xanthine oxidase,XO)是高尿酸血症及痛风治疗药物的重要靶点。基于前期获得的高活性XO抑制剂1,采用生物电子等排策略,设计并合成了噁二唑类化合物及其开环类似物共17个。其中,化合物2l、2n、3b在10μmol·L^(-1)浓度下具有显著的XO抑制活性;化合物3b抑制XO的IC50值达到1.45μmol·L^(-1)。

摘要：通过对磁场控制下的二维磁光子晶体太赫兹波偏振传输特性的研究,利用铁氧体磁光材料的磁导率随外磁场改变而变化的特点,设计了具有可控起偏、偏振分束和可调谐波片功能的光子晶体太赫兹偏振控制器件.利用平面波展开法和严格耦合波分析分别计算了光子晶体带隙位置和透过率随外磁场强度变化的关系,用时域有限差分法计算了场分布和相位.结果表明,该结构可以实现高偏振消光比的偏振起偏器和分束器,以及在1THz附近-π—π相位范围的连续可调谐波片.

摘要：An EMU train with detailed cabin structural is established based on the finite element *** secondary impact between train driver and control desk is fully analysed and two measures are proposed to reduce the driver injury severity,such as the multi-objective optimization of the driver seat position and equipping the train with three-point seat *** results indicate that the driver seat position has a significant effect on the driver injury severity during a secondary *** to the multi-objective optimization,some Pareto solutions are suggested to design the driver seat *** that,it is also indicated although the chest and leg are well protected when the driver wears a two-point seat belt,it increases the head injure during a secondary *** the other hand,the three-point seat belt can supply the train driver with an overall protection against the secondary *** injury criteria(HIC,VC,TI)of the driver with the three-point seat belt is significantly lower than those of the driver without seat ***,according to the simulation analysis,the limited load of the three-point seat belt is suggested about 1.5 kN.

摘要：为研究油茶果壳的破壳力学特性，探究油茶果壳如何破裂，对油茶果的几何特性参数进行测量，为油茶果破壳机提供理论支持。使用TMS-PRO质构仪对油茶鲜果进行力学特性试验，运用SolidWorks对油茶果进行建模，并运用ANSYS Workbench对油茶果进行模拟破壳试验。结果表明：油茶果的球度系数为0.94,可以近似于球体模型进行研究，沿油茶果纵向方向加载最省力，直径和加载速率对破壳力的影响显著，剪切破壳力约为挤压破壳力的35%;通过有限元分析显示应力主要集中于压缩板与油茶果接触边缘部分，外壳总形变为6.372 mm,可以达到破壳需求。

摘要：In order to improve the processing precision and shorten the hob manufacturing cycle of the face gear,a precision generating hobbing method for face gear with the assembly spherical hob is ***,the evolution of the cylindrical gear to spherical hob basic worm is analyzed,then the spherical hob basic worm is designed,thus the basic worm and spiral angle equation of spherical hob are ***,based on the design method of the existing hob,the development method of the assembly spherical hob is analyzed,the cutter tooth and the cutter substrate of the assembly hob are designed,and the whole assembly is ***,based on the need of face gear hobbing,a numerical control machine for gear hobbing is developed,and the equation of the face gear is ***,for reducing the face gear processing errors induced by equivalent installation errors,the error analysis model is established and the impacts of each error on the gear tooth surface are ***,the assembly spherical hob is manufactured and the gear hobbing test is *** to the measurement results,the processing parameters of face gear hobbing are modified,and the deviation of tooth surface is significantly reduced.

摘要：近代中国在接受西方科技与科幻思维的过程中,除少部分上层人物直接接触与学习之外,一般民众则从普通视角出发,通过带有科学基础与二次想象的再加工进行认知。在这个过程中,中国画师通过“想象与创作”,在一定程度上实现并传移了这种早期科学内容。在此时期的诸多科学想象图绘中,气球图形的绘制多种多样、中西结合、形态各异,充分利用与发挥了当时中国画师的想象力,成为早期中国科学幻想的经典“设计创作”。同时,国人在接受这些气球图形时,又对其添加了时代化的隐喻与期待,一定程度上将其塑造为“以物代志”的典型代表。

摘要：教学评估机制在整个教学体系中具有导向和规范的重要功能,建立高等艺术院校教学评估体系,不能以文科或理工学科的共性标准代替艺术学科的特殊标准,要充分尊重和遵循艺术学科自身的发展规律,把握艺术学科建设的特点,构建科学的高等艺术院校教学评估体系。高等艺术院校教学评估体系既要注重定量的层面,又要注重定性的层面,才能达到艺术院校的教学评价目的。