摘要：Backgrou nd Dense titanium(Ti)fusion cages have been commonly used in transforaminal lumbar interbody ***,the stiffness mismatch between cages and adjacent bone endplates increases the risk of stress shielding and cage *** The current study presents a multiscale optimization approach for porous Ti fusion cage development,including microscale topology optimization based on homogenization theory that obtains a unit cell with prescribed mechanical properties,and macroscale topology optimization that determines the layout of framework structure over the porous cage while maintaining the desired *** biomechanical performance of the designed porous cage is assessed using numerical simulations of fusion *** laser melting is employed to assists with fabricating the designed porous structure and porous *** The simulations demonstrate that the designed porous cage increases the strain energy density of bone grafts and decreases the peak stress on bone *** mechanical and morphological discrepancies between the as-designed and fabricated porous structures are also *** From the perspective of biomechanics,it is demonstrated that the designed porous cage contributes to reducing the risk of stress shielding and cage *** optimization of processing parameters and post-treatments are required to fabricate the designed porous *** present multiscale optimization approach can be extended to the development of cages with other shapes or materials and further types of orthopedic implants.

摘要：基于共轭聚合物骨架的自愈合弹性体对于可拉伸电子至关重要.本文工作通过氢键侧链来调控共轭聚合物的机械性能以及自愈性能,同时确保发光共轭聚合物保持固有的光物理特性.设计并制备了高性能的可拉伸自愈合发光弹性体,其机械拉伸长度接近900%,常温下的自愈效率达到70%,且发光量子效率超过60%.这种发光弹性体在经历400%的拉伸形变并回复后,不仅机械性能能够恢复,光物理性质也恢复如初.利用该弹性体,制备了多功能的光电器件.

摘要：Due to their capability of reversibly accepting multi lithium ions,polyoxometalates(POMs)have been widely regarded as promising candidates for electrochemical lithium ***,the insulating nature of POMs hinders fast migration kinetics of lithium within the bulk of these ***,we propose the introduction of a local electric field surrounding the POM nanoparticles consisting of Mn and V where the concomitant Coulomb forces can accelerate the migration of lithium *** rationally hybridizing POMs with MXene nanosheets,the imbalanced charge distribution emerging at their interface produces the local electric field,thereby leading to a 250-fold increase of lithium diffusion *** this regard,a capacitive contribution as high as 81.7%at 1.0 mV sis ***,the POM nanoparticles could densely assemble on the surface of MXene nanosheets,offering highly packed electrodes and thus high volumetric *** to the improved lithiumion transfer kinetics,the POMs/MXenes composites are paired with activated carbon to produce lithium-ion capacitors which could offer a high energy density of 195.5 W h kgand a large power capability of 3800 W *** findings in this work could build a clear relationship between materials with different conductivities for designing electrode materials.

摘要：Judge Dee Mysteries was written by a Dutch diplomat and orientalist Robert van Gulik, and has been translated into more than twenty languages, gaining a wide attention with the honorary title of ＂Orienta/Sherlock Holmes＂ in English world. It returned to China with Chen Laiyuan and Hu Ming＇s translations in 1980s, and since then there emerged various studies by Chinese scholars on Robert van Gulik and his works. This article makes a historical review of Judge Dee Mysteries in Chinese world during the past 20 years, presents problems in translating and introducing Robert van Gulik in Chinese, and proposes comments and suggestions for further translation and studies of Judge Dee Mysteries in a comparison with Chinese gong＇an fictions.

摘要：探讨了将两种主配体与三种辅助配体交叉结合形成一系列Ir(Ⅲ)配合物的理论意义,旨在理论设计出适合工业应用的OLED发光材料.通过密度泛函理论(DFT)与时间相关密度泛函理论(TD-DFT)对其电子结构、前线分子轨道、单线最低吸收、三重激发态及发射光谱等性质进行了理论计算,并对数据进行了理论分析.通过更换不同辅助配体和在主配体特定位置加入F原子引起HOMO-LUMO带隙变化,实现调整发光材料颜色的效果.进一步研究其是否能适用于当前主流器件,期望本研究将为实际实验合成提供理论支撑.

摘要：少数民族民间音乐由于受到外来文化侵入、人们的生活环境改变、传承方式单一和音乐形式较为陈旧等因素的影响,受到的关注度越来越低,一些优秀的少数民族民间音乐正在逐渐消失。合唱艺术是我国具有广泛群众基础的音乐艺术形式,目前已有许多利用合唱艺术来传播、发扬少数民族民间音乐的成功案例,并且合唱艺术具有日益民族化的发展趋势,这都非常有利于利用合唱艺术来传承少数民族民间音乐。在此分析我国少数民族民间音乐的传承现状,探讨合唱艺术传承少数民族民间音乐的可行性,论述合唱艺术传承少数民族民间音乐的方法和途径。

摘要：对现代景观创意设计进行了分析和研究,从现代景观的概念、类型、设计元素等方面进行了论述,提出了在现代景观创意设计中园路、铺装、水景与植物等设计要素的具体实践方法,具有一定的可行性和指导意义。

摘要：针对离心泵磨损机理错综复杂和高度非线性的特点,提出了基于最小二乘支持向量机的离心泵磨损特性分析方法,通过对算法的实现,建立了离心泵的磨损特性分析和几何参数优化的智能模型,模拟得到离心泵的磨损特性关系,分析了磨损随轮叶片几何参数的变化规律。与神经网络和普通支持向量机方法进行计算比较,结果表明,最小二乘支持向量机磨损预测模型得出的的平均相对误差只有0.005%,学习速度为12步,训练时间为1.1s,学习速度和预测精度得到了很大的改善。可为离心泵的磨损特性分析及其抗磨可靠性设计提供新的可行方法。

摘要：泵的性能曲线是泵选型、优化调度和泵站运行的重要依据,通常该曲线均是通过试验或是根据试验数据和性能图表上的数据进行曲线拟合而获得,但这些方法复杂昂贵,而且拟合精度不高。针对以上方法的缺点,提出了一种基于交叉验证最优参数选择的最小二乘支持向量机(LSSVM)泵性能预测方法。通过最小二乘支持向量机(LSSVM)学习算法网络的设计和构建,并应用网络搜索-交叉验证的方法对支持向量机参数进行优化选择,模拟得到复杂和非线性很强的泵的性能曲线,经优化模型输出值和试验值、同多项式拟合值以及径向基神经网络误差的比较,交叉验证最优参数选择的最小二乘支持向量机具有优良的非线性建模能力和泛化能力,在有限学习样本条件下仍获得了很高的精度,平均相对误差为0.02378%,为泵的性能分析提供了一种简便可行的智能方法。

摘要：目的:输水管道的驼峰气阻是指由于管路高峰位置的滞气作用使气体不断聚积在峰顶附近、产生的气体阻碍水流的局部水力现象。它能够导致管路过水断面减小、输水能耗增加、输送效率降低和管路压力振荡等后果,严重威胁海底管道输水的稳定性和安全性。本文旨在分析滞留气团在供水管道中的力学平衡、能量损失、移动和溢出机理,研究水流流速对气团的推移特性,提出预测和消除驼峰气阻的方法,使输水管道免受驼峰气阻的危害,提高输水管道的供水效率。创新点:1.设计了具有连续坡角变化的圆弧形驼峰管道实验,该实验可以定量模拟气团体积和平衡角度;2.建立了驼峰气阻的水头损失经验公式和恒定流情况下驼峰气阻的管道坡角和流速的对应关系式,可用于预测和消除驼峰气阻的危害。方法:1.通过驼峰气团的受力特性分析,获得满足量纲和谐的力学平衡方程;2.采用试验观察和测试获得有无气泡情况下的水头损失和平衡状态下的坡角,通过等价球体方法对测试数据进行无量纲拟合,获得气阻的水头损失方程系数,并通过流速和平衡坡角建立恒定流情况下的临界平衡方程;3.基于试验拟合获得临界平衡方程,建立预测和评估气阻的准则系数,并提出消除气阻的水流临界流速。结论:1.当管路流速较小时,供水管路的驼峰顶端可能滞留和聚集气体,形成驼峰气阻;气体体积越大对水流阻碍越明显,可能造成的水头损失也越大;2.利用等价球体法可以极大地简化驼峰气阻的形状,并良好地模拟气阻的平衡特性和阻力特性;3.管道流速是影响驼峰气阻临界平衡位置的最重要因素,通过减小管道起伏的坡角或增加水流流速可以防止和消除驼峰气阻的危害。