摘要：The discovery of superconductivity at Tc = 26 K in fluorine-doped LaFeAsO [1] has led to the subsequent findings of dozens of new superconducting materials in the class of Fe-based superconductors (FeSCs)[2,3]. All those FeSCs were found to possess antifluorite-like Fe2X2 (X = As, Se) layers which were believed to be the crucial structural motif for the emergence of high-temperature superconductivity. This common feature makes it possible to design a new FeSC with the crystal chemistry [3-5]. For example, with the consideration of the intergrowth of BaFe2As2 and BaTi2As2O, the new FeSC Ba2Fe2Ti2As4O (Tc=21 K) was discovered [6]. The block-layer-design approach was also demonstrated to be effective for other class of layered materials, such as Eu3Bi2S4F4 [7], LaPb- BiS3O [8], La5Cu4As4O4C12 [9], Pb5BiFe3O10Cl2 [10], and Bi4Q4CU1.7Se2.7CI03 [11].

摘要：由于基坑开挖过程存在大量的不确定性,其支护结构在设计阶段无法根据现场环境的变化进行实时变形可靠度分析与预测.围护结构分布范围大,失效位置不可预测.工程监测数据由于监测点数量的限制难以直接反映围护结构连续变化的状态.采用穿越率法,提出一种适用于以地下连续墙为围护结构的深基坑工程的侧向变形预测与分析模型.利用MATLAB建立自适应指数平滑模型,自动计算和预测深基坑围护结构在不同深度的侧向变形.对比实测与预测的侧向变形数据,结果表明该自适应指数平滑模型在短期预测中具有精度较高、误差波动小的特点;同时采用预测数据的超越概率分析表明,深基坑侧向变形的分析模型同样适用于由自适应指数平滑法获得的预测数据,且随着位移限值远离最大监测位移值,分析精度将逐渐提高.通过利用椭圆搜索模式的反距离加权插值法,解决了样本点仅集中分布于深度方向的缺点,使插值结果更加平滑,结合基于深基坑侧向变形的分析模型,实现了围护结构空间曲面的变形预测,使评价反馈方式更加直观简洁.

摘要：This paper proposes a method to construct new kind of non-maximal imaginary quadratic order （NIQO＊） by combining the technique of Diophantine equation and the characters of non-maximal imaginary quadratic order. It is proved that in the class group of this new kind of NIQO＊, it is very easy to design provable secure cryptosystems based on quadratic field （QF）. With the purpose to prove that this new kind of QF-based cryptosystems are easy to implement, two concrete schemes are presented, i.e., a Schnorr-like signature and an EIGamel-like encryption, by using the proposed NIQO＊. In the random oracle model, it is proved that： （1） under the assumption that the discrete logarithm problem over class groups （CL-DLP） of this new kind of NIQO＊ is intractable, the proposed signature scheme is secure against adaptive chosen-message attacks, i.e., achieving UF-CMA security; （2） under the assumption that the decisional Diffie-Hellman problem over class groups （CL-DDH） of this new kind of NIQO＊ is intractable, the enhanced encryption in this paper is secure against adaptive chosen-ciphertext attacks, i.e., reaching IND-CCA2 security.

摘要：Al is considered as a promising lithium-ion battery(LIBs)anode materials owing to its high theoretical capacity and appropri-ate lithation/de-lithation ***,its inevitable volume expansion causes the electrode structure instability,leading to poor cyclic ***’s worse,the natural Al2O3 layer on commercial Al pellets is always existed as a robust insulating barrier for elec-trons,which brings the voltage dip and results in low reversible ***,this work synthesized core-shell Al@C-Sn pellets for LIBs by a plus-minus *** this proposal,the natural Al2O3 passivation layer is eliminated when annealing the pre-introduced SnCl2,meanwhile,polydopamine-derived carbon is introduced as dual functional shell to liberate the fresh Al core from re-oxidization and alle-viate the volume *** from the addition of C-Sn shell and the elimination of the Al2O3 passivation layer,the as-prepared Al@C-Sn pellet electrode exhibits little voltage dip and delivers a reversible capacity of 1018.7 mAh·g^(-1) at 0.1 A·g^(-1) and 295.0 mAh·g^(-1) at 2.0 A·g^(-1)(after 1000 cycles),***,its diffusion-controlled capacity is muchly improved compared to those of its counterparts,confirming the well-designed nanostructure contributes to the rapid Li-ion diffusion and further enhances the lithium storage activity.

摘要：随着电力行业的不断发展,变压器的安全与稳定愈发重要。为满足变压器油中C_(2)H_(2)的在线监测需要,选取1532 nm的分布式半导体激光器与12 m光程怀特池,研制了基于可调谐二极管激光吸收光谱技术与波长调制技术的变压器油中C_(2)H_(2)在线监测装置,实现了油中溶解C_(2)H_(2)分离、气体检测、结果分析等功能,测量周期约为25 min,测试过程无损样本。该装置检测精准快速,无需人工操作,可为变压器提供实时的安全参考意见。

摘要：Traditional tumor models do not tend to accurately simulate tumor growth in vitro or enable personalized treatment and are particularly unable to discover more beneficial targeted *** address this,this study describes the use of threedimensional(3D)bioprinting technology to construct a 3D model with human hepatocarcinoma SMMC-7721 cells(3DP-7721)by combining gelatin methacrylate(GelMA)and poly(ethylene oxide)(PEO)as two immiscible aqueous phases to form a bioink and innovatively applying fluorescent carbon quantum dots for long-term tracking of *** GelMA(10%,mass fraction)and PEO(1.6%,mass fraction)hydrogel with 3:1 volume ratio offered distinct pore-forming characteristics,satisfactorymechanical properties,and biocompatibility for the creation of the 3DP-7721 *** analysis and quantitative real-time fluorescence polymerase chain reaction(PCR)were used to evaluate the biological properties of the *** with the two-dimensional culture cell model(2D-7721)and the 3D mixed culture cell model(3DM-7721),3DP-7721 significantly improved the proliferation of cells and expression of tumor-related proteins and ***,we evaluated the differences between the three culture models and the effectiveness of antitumor drugs in the three models and discovered that the efficacy of antitumor drugs varied because of significant differences in resistance proteins and genes between the three *** addition,the comparison of tumor formation in the three models found that the cells cultured by the 3DP-7721 model had strong tumorigenicity in nude *** evaluation of the levels of biochemical indicators related to the formation of solid tumors showed that the 3DP-7721 model group exhibited pathological characteristics of malignant tumors,the generated solid tumors were similar to actual tumors,and the deterioration was *** research therefore acts as a foundation for the application of 3DP-7721 models in drug devel

摘要：目的:进入新时期,文化在振奋民族精神、维系国家认同、促进经济社会发展和人的全面发展等方面的作用充分凸显。党的十八大以来,习近平总书记将宣传思想文化工作摆在治国理政的重要位置。文章基于坚定文化自信的倡议,探究武汉方言文化的创新性特征,以期开发出具有地域性特征的文化创意产品。从方言文化的研究价值与面临的问题着手,探讨方言文创产品的设计方法与原则,为语言文化的传承和保护提供新的设计思路与实践方法。方法:首先以文献研究法为基础,梳理武汉方言声韵的独特性。其次,通过实地调研法与案例分析法,深挖方言文化现存的问题和地域性文化创意产品开发现状,并提炼武汉方言的主要特征,从方言的“腔调”“文字”“蕴意”入手进行产品设计整合。结果:文章结合有关方言文创的现有问题,站在“言”“文”“意”的层面对方言文化进行提炼,融入文化创意产品设计。结论:语言与文化是相辅相成的,方言文化是祖辈世世代代积淀下来的宝贵文化资源,是我国重要非物质文化遗产。通过对方言的提炼,可以将其画面表现与产品互动功能相融合,结合武汉方言特征元素进行文创产品设计,利用文化创意产品热潮将方言文化传播出去,维护文化多样性,传承精神文化。

摘要：长期以来,我国公共艺术的规划主要集中在城市雕塑领域,交通管理部门缺乏对交通系统公共艺术的专项规划,导致交通项目中的公共艺术实践成为“无源之水,无本之木”。以美国为研究对象,总结归纳其交通系统公共艺术规划的发展阶段、具体策略,认为我国有必要针对交通领域公共艺术的实际问题给予制度层面的保障,尽快出台公共艺术专项规划政策及规划规范,明确公众参与的定义及细则,实现“专职专项、分级分类、有效参与”的规划,以支持我国交通系统公共艺术的永续发展和公众参与的有效落实。

摘要：“库里肖夫效应”是电影语言的基础性理论。作为电影史上最早进行实验探索的理论家之一,库里肖夫将蒙太奇视为电影媒介的本质,并事实上在实验中提示出一个技术和意识共在的时间结构。受限于时代环境及技术条件,库里肖夫的探索最终停留在非正式的访谈层面,未及充分展开。神经电影学的方法允许研究者在媒介化时代重返理论及其历史现场,借助科学设计、严格操作的神经电影学测试,库里肖夫实验的当代答案得到彰显。影像与认知结构之间存在绵延百年的耦合式共振,同时又以意义阐释的缝隙为文化经验预留了位置;此种“稳定性”与“多样性”间暗含的人与技术之关系,可能正是在后电影时代认识电影的关键所在。

摘要：作为装配体模型中的重要内容,即装配语义,目前大多采用人工交互的方式进行设置,过程往往费时低效.为解决此问题,提出一种双层次装配语义智能识别与设置方法.首先,改进现有的图注意力网络,将其拓展为双层次识别网络,实现透过各种几何形状,智能识别每个零件模型表面的典型运动副接口;其次,改进现有反向传播人工神经网络的网络结构以提高网络性能,智能识别每个零件模型所有运动副接口上蕴含的装配约束类型及关联的几何实体;最后,基于上述识别的信息,任意2个零件模型之间自动搜索配对的运动副接口和装配约束几何实体,并快速且半自动地设置它们之间完整的装配语义.为有效地支持上述网络模型训练,构建了一个包含2787个CAD零件模型的数据集.实验表明,该方法对运动副接口和装配约束的类型及关联几何实体识别的准确率均超过93.0%.同时,与现有的相关工作相比,所提方法具有有效地适用于快速设置各种装配体模型其装配语义的优势和潜力.