摘要：Based on FEM theory,a method of dynamic analysis for hingeless rotors considering anisotropic composite materials is established.A parametric modeling method of composite blade with typical profile and high simulation degree for design is *** the finite element method,the profile characteristics of rotor blade can be obtained efficiently and accurately,and the synchronization of parametric design and finite element analysis of structural characteristics can be *** a 23-degrees of freedom non-linear beam element is used to simulate the extended one-dimensional beam,thereby a nonlinear differential equation describing the elastic motion of the rotor is *** obtain the crosssectional target characteristics of the blades,an inverse design method is proposed for cross-section components based on combinatorial optimization *** calculation and validation work show that the proposed model can effectively analyze the aeroelastic characteristics of general composite ***,the influence of cross-sectional parameters on the aeroelastic stability and hub loads of hingeless rotor is analyzed and some remarkable conclusions are obtained.

摘要：In this article,three novel and simple molecular structure with donor-acceptor(D-A) type copolymers via only head-to-head alkoxy(OR) and/or alkylthio(SR) side chains onto the bithiophene(BT) as donor units and fluorinated benzotriazole(FBTA) as acceptor unit,namely,PBTOR-FBTA,PBTOSR-FBTA and PBTSRFBTA,were successfully designed and *** impacts of sulfur-oxygen(S…O) or sulfur-sulfur(S-S) noncovalent interactions on their physicochemical properties,molecular stacking,carrier mobility,morphologies of blend films,as well as their photovoltaic performance were deeply and systematically *** introduction of SR side-chains suddenly lowered the highest occupied molecular orbital(HOMO) energy levels,blue-shifted absorption,enhanced π-π stacking,as well as improved morphology of the photoactive layer blends in comparison with the re ference polymer without SR *** solar cells(PSCs) were fabricated to estimate their photovoltaic performance of the *** an optimized blend ratio of PBTSR-FBTA:PC71BM(1:0.8,w/w),the PBTSR-FBTAbased device exhibits a higher power conversion efficiency(PCE) of 6.25%,which is about 3.34 and 1.87 folds than that of the PBTOR-FBTA and PBTOSR-FBTA-based devices,*** research results demonstrate that the modification of the simple and low-cost SR side chains is an effective strategy to improve the photovoltaic performance of the polymers.

摘要：The one-ladle technology requires an efficient ironmaking and steelmaking interface. The scheduling of the hot metal ladle in the steel plant determines the overall operational efficiency of the interface. Considering the strong uncertainties of real-world production environments, this work studies the dynamic scheduling problem of hot metal ladles and develops a data-driven three-layer approach to solve this problem. A dynamic scheduling optimization model of the hot metal ladle operation with a minimum average turnover time as the optimization objective is also constructed. Furthermore, the intelligent perception of industrial scenes and autonomous identification of disturbances, adaptive configuration of dynamic scheduling strategies, and real-time adjustment of schedules can be realized. The upper layer generates a demand-oriented prescheduling scheme for hot metal ladles. The middle layer adaptively adjusts this scheme to obtain an executable schedule according to the actual supply–demand relationship. In the lower layer, three types of dynamic scheduling strategies are designed according to the characteristics of the dynamic disturbance in the model:real-time flexible fine-tuning, local machine adjustment, and global rescheduling. Case test using 24 h production data on a certain day during the system operation of a steel plant shows that the method and system can effectively reduce the fluctuation and operation time of the hot metal ladle and improve the stability of the ironmaking and steelmaking interface production rhythm. The data-driven dynamic scheduling strategy is feasible and effective, and the proposed method can improve the operation efficiency of hot metal ladles.

摘要：In this study,we propose valley phononic crystals that consist of a hexagonal aluminum plate with six chiral arrangements of *** phononic crystals were introduced into a topological insulator(TI)system to produce topologically protected edge waves(TPEW s)along the topological *** implementation of chiral topological edge states is different from the implementation of topological edge states of systems with *** the conventional breaking of mirror symmetry,a new complete band with topological edge modes gap was opened up at the Dirac point by tuning the difference in lengths of the ligaments in the chiral unit *** investigated the dispersion properties in chiral systems and applied the dispersion properties to waveguides on the interfaces to achieve designable route ***,we simulated the robust propagation of TPEWs in different routes and demonstrated their immunity to backscattering at ***,the existence of the valley Hall effect in chiral systems was *** study findings may lead to the further study of the topological states of chiral materials.

摘要：A series of sulfenimine cephalosporin sulfoxide derivatives （Ta-v） were designed, synthesized and evaluated for their inhibitory activity against TEM-1 and cephalosporinase in cell-free systems. Some of the tested compounds showed enhanced inhibitory activity against class C β-lactamase cephalospor- inase compared with the tazobactam. The most promising compounds 7c and 7n （IC50 ~ 7.6 and 8.6 μmol/L, respectively） were further investigated in combination with cefradine against a variety of clinical isolated fi-lactamase-producing bacterial strains.

摘要：湍流边界层流动广泛存在于自然界、航空航天以及环境工程等领域.壁面摩擦速度是湍流边界层理论研究和工程应用中的一个重要参数,对其进行准确预测具有十分重要的科学意义和工程价值.文章基于雷诺平均动量方程提出了一种利用湍流边界层平均速度和雷诺应力剖面预测壁面摩擦速度的积分方法.该方法仅需要同一流向位置、边界层外层的平均流场分布,显著降低了对近壁面流场数据的依赖性.通过文献中大量的直接数值模拟和实验数据验证,该方法的相对误差在±3%以内,且受积分上下限以及边界层厚度等模型参数的影响较小.通过与文献中具有相似积分形式的壁面摩擦速度预测方法比较,发现湍流边界层壁面摩擦速度预测方法的精度与选取的总切应力模型密切相关.本文提出的壁面摩擦速度预测方法适用于不可压缩、零压力梯度光滑及粗糙壁面湍流边界层流动,具有精度高和鲁棒性强等特点,研究结果可为航空航天及能源动力等领域重大工程应用中湍流壁面摩擦阻力的准确预测和调控提供理论指导.

摘要：古文选本是乾嘉时期重要的文治手段。为了强化国家文治,清帝将古文教育纳入国家文化职能,将古文编选与文化政策、文教体制、传播机制进行了有机统一,使古文选本与乾嘉文治进行了紧密结合。“稽古右文”的文化政策与古文选本相结合,产生了大量御选本、官选本,从官方角度规范了士风导向。治民养材的文教体制与古文选本相配合,产生了一大批以“唐宋八大家选本”为代表的科举选本,为人才培养明晰了学习路径。刻书泽人的传播机制与古文选本相融合,使官刻本与坊刻本相呼应,并且出现了商业与科举、教育相融合的趋势。商业与科举、教育的融合导致商业深入科举、教育,使古文选本中出现了广告、促销等商业行为和商业乱象,但也提高了选本刊刻效率,使商业更好地为科举、教育服务。书籍刊刻带来的经济繁荣也使官方对文化产业的态度变得微妙。

摘要：A simple self-catalyzed chemical vapor deposition process was conducted to synthesize single-crystalline GaSb nanowires,where Ga droplets were utilized as the *** as-grown GaSb nanowires exhibited typical p-type semiconductor behavior with the calculated hole mobility of about 0.042 cm^2 V^-1 s^-*** photoresponse properties of the GaSb nanowires were studied by fabricating nanowire photodetectors on both rigid and flexible *** results revealed that the photodetectors exhibited broad spectral response ranging from ultraviolet,visible,to near-infrared *** the device on rigid substrate,the corresponding responsivity and the detectivity were calculated to be 3.86×10^3 A W-1 and 3.15×10^13 Jones for 500 nm light,and 7.22×10^2 A W-1 and 5.90×10^12 Jones for 808 nm light,respectively,which were the highest value compared with those of other reported Ga1-xInxAsySb1-y structure ***,the flexible photodetectors not only maintained the comparable good photoresponse properties as the rigid one,but also possessed excellent mechanical flexibility and *** study could facilitate the understanding on the fundamental characteristics of self-catalyzed grown GaSb nanowires and the design of functional nano-optoelectronic devices based on GaSb nanowires.

摘要：363 kV线路作为西北地区的主干线路,发展形式良好,市场前景广阔。但随着科技的进步,某公司的363 kV产品已无法适应日趋激烈的竞争环境。文中以断路器、隔离/接地/快速接地开关、母线为基础,介绍公司新研制的363 kV GIS整体参数、产品设计和型式试验情况。断路器设计时分析了大电流容量试验电弧能量对弧触头的烧蚀情况,断口间五柱支撑结构;隔离/接地/快速接地开关设计时分析了绝缘、温升等;母线设计时分析了导体温升和绝缘盆子电场、机械强度。型式试验表明:新研制的363 kV GIS满足高参数要求,断路器额定短路电流63 kA,标准时间常数120 ms,快速接地开关达到超“B”类;目前已取得第三方全套型式试验报告,正式应用在中国西北地区变电站工程项目。

摘要：pH敏感高分子是智能高分子的重要分支,基于其体积、质量或者弹性等参数随pH值变化的性质,可以应用在生物、化学和微/纳机械等多个领域.现有研究多集中在应用领域,缺乏从更深层次的机理上的研究,因此亟需在分子水平上对pH敏感高分子的环境敏感机理进行研究.本工作基于控制变量实验法,利用基于原子力显微镜的单分子力谱技术(SMFS)对pH敏感型高分子聚丙烯酸(PAA)在pH变化前后的单分子力学弹性进行对比研究.结果表明,随着pH值增加,PAA单链构象经历了从塌缩到完全伸展的改变,并获得了不同构象之间的能量差,由此提出了一种全新的分子马达(开关)的设计概念.本工作的研究结果有望为设计多重响应新型聚合物和智能传感器提供理论基础和数据支持.