摘要：Let g be an n-Lie superalgebra. We study the double derivation algebra 7）（g） and describe the relation between 7）（9） and the usual derivation Lie superalgebra Der（9）. We show that the set 7）（9） of all double derivations is a subalgebra of the general linear Lie superalgebra gl（9） and the inner derivation algebra ad（9） is an ideal of 7）（9）. We also show that if 9 is a perfect n-Lie superalgebra with certain constraints on the base field, then the centralizer of ad（9） in 7P（9） is trivial. Finally, we give that for every perfect n-Lie superalgebra 9, the triple derivations of the derivation algebra Der（9） are exactly the derivations of Der（9）.

摘要：重载AGV(Automated Guided Vehicle)在启动和突加负载时,传统的直接转矩控制(Direct Torque Control,DTC)存在速度超调、转矩脉动大和抗干扰性差等因素。为提高直接转矩控制对重载电机的控制性能,设计了一种线性自抗扰结合改进滑膜控制的直接转矩控制策略。首选,针对传统PI控制速度环存在的速度跟踪不稳定,采用改进的线性自抗扰控制器替换了PI控制结构。然后,针对转矩环在重载时转矩脉动较大的问题,对原有滑膜控制器进行了改进。最后,通过Matlab/Simulink搭建了控制模型,验证了改进的融合控制策略对重载AGV电机的转矩和磁链波动分别降低了56.12%和21.8%,突加负载时的速度波动降低了50.2%,并消除了启动时的速度超调,提升了重载AGV行走时的平顺性。

摘要：Natural products（NPs） have long been recognized as a valuable resource for drug discovery, and bringing NP-related features to virtual libraries is believed to be an effective way to increase the coverage of druggable chemical space. Here, deep learning-based molecule generative model, which is a recent technique in de novo molecule design, was applied to generate virtual libraries with NP-like properties. Results demonstrated that the model was effective in generating molecules that highly resemble NPs. Moreover, the model was also found to be capable of generating NP-like molecules that were also easy to synthesize, significantly increasing the practical value of the compound library.

摘要：The electrocatalytic N_(2)reduction reaction(NRR)is expected to supersede the traditional Haber-Bosch technology for NH3 production under ambient *** activity and selectivity of electrochemical NRR are restricted to a strong polarized electric field induced by the catalyst,correct electron transfer direction,and electron tunneling distance between bare electrode and active *** coupling the chemical vapor deposition method with the poly(methyl methacylate)-transfer method,an ultrathin sandwich catalyst,i.e.,Fe atoms(polarized electric field layer)sandwiched between ultrathin(within electron tunneling distance)BN(catalyst layer)and graphene film(conducting layer),is fabricated for electrocatalytic *** sandwich catalyst not only controls the transfer of electrons to the BN surface in the correct direction under applied voltage but also suppresses hydrogen evolution reaction by constructing a neutral polarization electric field without metal *** sandwich electrocatalyst NRR system achieve NH3 yield of 8.9μg h^(−1)cm^(−2)and Faradaic Efficiency of 21.7%.The N_(2)adsorption,activation,and polarization electric field changes of three sandwich catalysts(BN-Fe-G,BN-Fe-BN,and G-Fe-G)during the electrocatalytic NRR are investigated by experiments and density functional theory *** by applied voltage,the neutral polarized electric field induced by BN-Fe-G leads to the high activity of electrocatalytic NRR.

摘要：针对残膜回收机捡拾装置寿命低以及作业过程中存在漏膜等问题,为提高残膜回收率及作业效率,设计了一种铲齿式起膜装置。设计起膜齿结构及排列方式,并进行起膜齿力学分析计算,确定起膜装置影响因素。使用EDEM软件对边膜齿开展离散元仿真,建立边膜齿-土壤的作业模型,选取边膜齿入土角、边膜齿铲片形状作为试验因素,以边膜齿所受合力以及磨损量作为评价指标,采用两因素三水平仿真试验。试验结果表明,当边膜齿入土角为35°、边膜齿铲片形状为SP_(2)时,作业性能较优,合力为228.83 N,磨损量为2.81 mm,较优组合下对土壤挠动情况进行分析,土壤表层呈驼峰状可有效抬起土壤,通过ANSYS结构静力学模块与EDEM耦合,得到边膜齿最大应力为48.513 MPa,最大变形量为0.416 mm,仿真结果表明起膜齿结构设计和作业情况满足设计要求。田间试验结果表明,铲齿式起膜装置平均起膜率为94.2%,研究结果可为残膜回收机起膜装置设计提供参考。

摘要：文章以国家非物质文化遗产青神竹编为研究对象,阐述青神竹编根据其历时发展轨迹,展现青神竹编在发展中存在实用性与艺术性相背离的问题。以青神竹编为代表的技艺类非物质文化遗产,本质是日常实用,而对于此类技艺保护过程中存在片面化倾向,所以要实现此类技艺的功能保护,需要站在日常实用的立场上进行进一步的探究,传统的技艺类非物质文化遗产的保护,需要遵循其自身的历史发展规律,避免其在发展过程中存在的功能断裂危机,更加注重技艺本身实用与艺术性保护和提升,以此对我国非物质文化遗产的发展提供借鉴与参考。

摘要：As a valuable resource for drug discovery, natural products remain largely unexplored. The cheminformatics analysis of natural product databases could help us know better about natural products, providing valuable information in drug design. In this study, we collected an in-home natural product library consisting of more than 220 000 molecules. The results showed that natural products were distributed more diversely than synthetic compounds and approved drugs in chemical space, and natural products still possessed better scaffold diversity. Besides, natural product scaffolds had more potential in some specific indications, such as antiarthritic, antihypertensive, antiallergic and analgesic. However, the utilization rate of natural product scaffolds is relatively low, especially in terms of potential indications. Therefore, we recommend the greater use of natural products while designing lead libraries.

摘要：随着数字技术的飞速发展,短视频已成为现代传播体系不可或缺的一部分,而手绘短视频作为手绘艺术与数字技术融合的创新形式,在新媒体平台上展现出独特的魅力和潜力。文章采用案例分析和实证研究相结合的方法,通过对手绘短视频的相关文献进行梳理,明确其发展历程和现状;通过选取典型案例进行深入剖析,揭示手绘短视频的传播特点和规律;通过传播数据调查实证研究方法,收集受众对手绘短视频的意见与反馈,为研究结论提供有力支持。研究发现,手绘短视频以生动直观的表现方式,极大提升了文化的普及度和传播效率,成为文化传播的新途径之一。同时,手绘短视频也为品牌形象塑造提供了新的创意和表达方式,为营销传播带来了新机遇。然而,手绘短视频创作也面临成本、技术和内容等多方面挑战,需要行业内外共同努力克服。针对手绘短视频创作面临的挑战,文章从受众的定位和传播渠道、政策支持、技术创新和人才培养等方面提出一系列对策建议,旨在推动手绘短视频在新媒体环境下高质量发展,推动其在文化传播领域发挥更大作用,同时也为相关领域的理论研究和实践探索提供新的思路和启示。

摘要：分析了1副复合模实现落料、拉深、冲孔、翻边4道工序一次冲压成形的工艺性,解决了车轴盖冲压成形一般需要4副模具完成的问题。同时还介绍了复合模结构设计思路及装配工艺方法,突破了复合模只能完成3道工序的方法,在模具结构设计上有所创新,并给出此类模具设计中结构参数的计算方法,生产的零件符合要求。

摘要：针对不同固体材料在不同条件下的摩擦磨损实验要求,开发设计了一种往复式摩擦磨损试验机,通过测量实验中产生的摩擦力、摩擦系数和磨损量的变化来研究材料的摩擦磨损性能。为提高测试系统的精确性和实时性,将计算机辅助测试系统应用到摩擦学试验当中,通过数据采集系统和测试软件系统完成摩擦磨损数据的实时动态测试,从根本上改变了传统摩擦磨损试验机的缺点。通过对聚四氟乙烯材料的摩擦磨损性能进行实验,证明该试验机性能稳定,测试系统准确可靠。