摘要：The 285.5 m-high Xiluodu Arch Dam is located in a seismic region along the Jinsha River in China, where the horizontal components of peak ground accelerations for design and checking earthquakes have been estimated to be 0.355 g and 0.423 g, respectively( g is the gravitational acceleration). The ground motion parameters of design and checking earthquakes are defined by exceedance probabilities of 2% over 100 years and 1% over 100 years, respectively. The dam shape was first selected and optimized through static analysis of the basic load combinations, and then adjusted after taking into account the seismic loads. The dam should be operational during and after the design earthquake with or without minor repairs, and maintain local and global stabilities during an extreme earthquake. Both linear elastic dynamic analysis and nonlinear dynamic analysis considering radiation damping, contraction joints, and material nonlinearity were conducted to assess the stress in the arch *** dynamic analysis shows that the maximum dynamic compressive stresses are less than the allowable levels, while the area with tensile stress over the limit is less than 15% of the dam surface and the maximum contraction openings range from 10 mm to 25 mm. The arch dam has sufficient earthquake-resistance capacity and meets the safety requirements. Nevertheless, steel reinforcement has been provided at the dam toe and in the zones of high tensile stress on the dam surface out of extra precaution.

摘要：In the past few decades,people have been trying to address the issue of walking instability in bipedal robots in uncertain ***,most control methods currently have still failed to achieve robust walking of bipedal robots under uncertain *** research mostly focuses on motion control methods for robots on uneven terrain and under sudden impact forces,with little consideration for the problem of continuous and intense external force disturbances in uncertain *** response to this issue,a disturbance-robust control method based on adaptive feedback compensation is ***,based on the Lagrangian method,the dynamic model of a bipedal robot under different types of external force disturbances was ***,through dynamic analysis,it was observed that classical control methods based on hybrid zero dynamics failed to consider the continuous and significant external force disturbances in uncertain ***,an adaptive feedback compensation controller was designed,and an adaptive parameter adjustment optimization algorithm was proposed based on walking constraints to achieve stable walking of bipedal robots under different external force ***,in numerical simulation experiments,comparative analysis revealed that using only a controller based on hybrid zero dynamics was insufficient to converge the motion of a planar five-link bipedal robot subjected to periodic forces or bounded noise disturbances to a stable *** contrast,in the adaptive feedback compensation control method,the use of an adaptive parameter adjustment optimization algorithm to generate time-varying control parameters successfully achieved stable walking of the robot under these *** indicates the effectiveness of the adaptive parameter adjustment algorithm and the robustness of the adaptive feedback compensation control method.

摘要：MicroRNAs(miRNAs)are a class of endogenous short noncoding *** regulate gene expression and function,essential to biological *** is necessary to develop an efficient detection method to determine these valuable biomarkers for the diagnosis of *** this paper,we proposed a general and rapid method for sensitive and quantitative detection of miRNA by combining CRISPR–Cas12a and rolling circle amplification(RCA)with the precircularized ***,the detection of miRNA-21 could be completed in 70 min with a limit of detection of 8.1 pM with high *** reaction time was reduced by almost 4 h from more than 5 h to 70 min,which makes detection more *** design improves the efficiency of CRISPR–Cas and RCA-based sensing strategy and shows great potential in lab-based detection and point-of-care test.

摘要：酶的分子改造和重新设计是解决酶催化工业应用瓶颈的重要途径。基于融合蛋白设计的融合酶技术是分子酶工程的一个研究热点,已逐渐应用于多功能酶和酶靠近效应的构建与控制研究中,显示出重要的理论和应用研究价值。文中对近年来融合酶的分子设计策略和应用研究的进展进行了综述。首先介绍了融合酶的概念和特点,并对最近研究中出现的融合酶构建策略进行了归纳总结,重点阐述了不同种类连接肽对融合酶的影响及其可能机理。同时,对目前融合酶的应用研究进行了归纳和讨论。最后,结合本实验室的研究,指出了融合酶领域的关键问题并对其发展方向进行了探讨和展望。

摘要：针对多智能体系统通信网络遭受欺骗攻击与隐私窃取问题,本文提出了一种新的具备隐私保护能力的多智能体系统弹性一致性算法.首先考虑到多智能体系统在信息传输环节直接将真实状态信息暴露给外界的问题,设计了一种基于状态分配思想的节点状态信息处理机制,来保证系统中节点状态信息隐私的安全性.其次考虑到外部攻击者对系统收敛的影响,在状态分配机制上进一步引入了检测环节,从而保证系统安全收敛.然后通过数学理论分析证明了算法能够有效保护节点初始状态信息隐私的同时能够保证系统实现弹性一致性收敛.最后通过数值仿真实验与对比实验,进一步验证了本文算法的有效性.

摘要：研究WE43合金在不同应力状态下的塑性和断裂行为。设计拉伸、压缩及剪切试样,并进行力学实验。采用数字图像相关技术对测试过程进行记录和处理。实验结果表明:WE43合金具有低的拉压非对称性,其断裂机制属于韧性断裂。基于Drucker屈服函数,采用不同的硬化规律模拟单轴拉伸和压缩下的塑性变形行为。通过数值模拟得到应力状态和断裂应变。采用Brozzo、Oh、Ko-Huh和DF2016准则对韧性断裂行为进行数值预测,并与实验结果进行对比。结果表明:采用Swift-Voce硬化定律和Drucker屈服函数能合理模拟塑性变形。DF2016断裂准则能准确预测合金在各种应力状态下的断裂行为。

摘要：氮化镓(GaN)高电子迁移率晶体管(HEMT)在高频、高功率密度等应用领域得到广泛应用,然而GaN HEMT器件的导通电阻会随着应用工况发生改变(动态电阻现象),导致其在应用中导通损耗不能被准确评估。针对这一问题,本文设计了一种GaN HEMT器件动态电阻测量系统。首先,介绍了动态电阻测试原理,其次,介绍了该测试系统的组成并对各部分设计原理及选型进行了详细的描述。最后,搭建了GaN HEMT器件动态电阻测试系统并对测试系统性能进行了测试。结果表明,该系统可以准确地测试GaN HEMT器件在不同工况下的动态电阻值。

摘要：在制造商或电子零售商投资说服性广告前提下,研究转售和代理销售模式对制造商线下进入决策的影响,同时考虑了电子零售商销售模式的选择问题。构建了3种说服性广告投资模型:无说服性广告、制造商投资说服性广告以及电子零售商投资说服性广告模式。研究结果表明,在制造商投资广告情形下:当进入成本处在中间范围内时,制造商是否开设线下实体店由广告投入成本决定;制造商线下进入会降低批发价格和增强广告强度;当利润分享比率高且线下进入成本和广告成本较低时,制造商和电子零售商受益于代理销售模式;在电子零售商投资广告情形下:制造商线下进入将使得作为代理商的电子零售商投资动机减弱,此时电子零售商更偏好于转售模式。

摘要：我国有着悠久的玻璃生产历史,在材料成分、制作工艺、使用功能上都形成了鲜明的发展特点,因此在玻璃艺术发展的早期,我们的先民对于这种特殊的材料就已经形成了有别于西方的认识。玻璃对于其他材质的“模仿”这一造物理念,就是其中的典型代表。这种特有的追求,在历史不同时期经历了“质的模仿”“形的置换”“料的演绎”几个层级的流变后,逐渐催生了我国特有的玻璃艺术造物方法、工艺理念和审美趣味。这些对于玻璃的质、形、料的特殊理解,在中国的文化土壤中逐步演变成为一种文化基因,深刻影响着我国现当代玻璃艺术审美的本土化表达,也推动了中国现当代玻璃艺术美学体系和文化的形成。

摘要：本文试分析《二十四城记》的电影创作手法,该影片试图以艺术审美的形式探寻历史的"真实性",在真实与想象之间以多种艺术形式穿行,这可以说是中国电影导演在审美与认识方面的一种新实践,也为中国电影创作提供了比较新颖的视角。诗性、戏剧性、当代行为艺术、流行音乐、纪录片手段等多种艺术手段的融合使得电影饱满而深入,产生了与单纯纪录片、故事片不同的效果,部分地消解了启蒙运动以来严肃性,进入后严肃时期。