摘要：为探究宋代少儿题材璎珞纹的艺术魅力,并探究其在当代纺织品上的设计策略及实用价值,文章基于宋代少儿题材璎珞纹为研究对象,采用文献研究法和图像分析法,系统地梳理宋代少儿题材璎珞纹的发展渊源及特征,并对璎珞纹在当代纺织品中的设计应用现状进行分析,总结出璎珞纹在当代纺织品中“形”与“色”结合的设计策略,通过设计实践验证宋代少儿题材璎珞纹在当代纺织品设计中的可能性,使传统艺术转化为新的设计力量融入现代生活当中。

摘要：为了在使用再调制技术的波分复用无源光网络(WDM PON)中实现透明光网络单元(colorless ONU),提出2种新型的多幅度编码方式(PAM补码和可变幅线路编码).新的编码方式结合了频谱整形编码和脉冲幅度调制(PAM).频谱整形编码能够抑制下行信号的低频分量,减少下行信号对上行再调制信号的串扰.高阶的PAM能够提高信号的编码效率,采用高阶PAM的下行信号可以被传统的二进制接收机接收.通过仿真验证了所提编码方式在再调制WDM PON中应用的可行性,测试了速率为625 Mb/s和1.25 Gb/s的上行信号再调制在速率为10Gb/s的下行信号上的性能.基于新型多幅度编码的再调制WDM PON方案能够减少上行再调制信号遭受的串扰,提高下行信号的编码效率.

摘要：Electrocatalysis is a promising approach to clean energy conversion due to its high efficiency and low environmental pollution. Noble metal materials have been studied to show high activity toward electrocatalyltic reactions, although such applications remain restricted by the high cost and poor durability of the noble metals. By precisely adjusting the catalyst composition, size, and structure, electrocatalysts with excellent performance can be obtained. Atomic layer deposition(ALD) is a technique used to produce ultrathin films and ultrafine nanoparticles at the atomic level. It possesses unique advantages for the controllable design and synthesis of electrocatalysts. Furthermore, the homogenous composition and structure of the electrocatalysts prepared by ALD favor the exploration of structure-reactivity relationships and catalytic mechanisms. In this review, the mechanism, characteristics, and advantages of ALD in fabricating nanostructures are introduced first. Subsequently, the problems associated with existing electrocatalysts and a series of recently developed ALD strategies to enhance the activity and durability of electrocatalysts are presented. For example, the deposition of ultrafine Pt nanoparticles to increase the utilization and activity of Pt, fabrication of core–shell, overcoat, nanotrap, and other novel structures to protect the noble-metal nanoparticles and enhance the catalyst stability. In addition, ALD developments in synthesizing non-noble metallic electrocatalysts are summarized and discussed. Finally, based on the current studies, an outlook for the ALD application in the design and synthesis of electrocatalysts is presented.

摘要：绫在中国传统丝绸品类中占重要地位,而绫在唐时期达于极盛,以本土文化为生命力,广泛吸收外来文化并将其转化和创新。唐绫纹样以纺织艺术的形式作为唐代文明中充满智慧与艺术的一部分,研究其艺术特征以及文化内涵对现代装饰设计发展具有重要的借鉴意义。因此,以唐为背景,对唐代绫纹样的特征进行梳理和总结,探究唐代绫纹样设计发展与唐代文化之间的联系,旨在能更好地传承唐代绫更深层的艺术特征和文化内涵。

摘要：In order to develop efficient photocatalysts,great efforts have been made to reduce hexavalent chromium to trivalent *** photocatalytic efficiency of this reduction depends largely on the adsorption and diffusion of hexavalent chromium ions on the surface of the *** this paper,polyanilineTiO2 composite can effectively improve the photocatalytic reduction performance and stability of hexavalent chromium *** effect of polyaniline(PANI) thickness on Cr(VI) activity and stability of photocatalytic reduction was studied by adjusting the content of PANI on Mesoporous TiO2(MT) *** the irradiation conditions,the reaction results showed that the reduction rate was 100%,and the maximum reaction rate reached 0.62 min-1 when the PANI modification was 3.0%.Moreover,the results showed that the reduction performance remained 100% after ten *** main reason is that the PANI modified on the surface of TiO2 is rich in positively charged amino group,which can efficiently adsorb the reactant Cr(VI),and make the product Cr(III) leave the reaction interface quickly,thus ensuring the performance of photocatalyst.

摘要：中国传统葫芦形造物艺术在演化上具有历史阶段性特点,在形态上可分为三维实体和二维平面两大类型,具有原始宗教观念、祈祥纳吉的生存观念、道释标志与文人品格等多重象征意义,是发展相关文化创意的宝贵资源。

摘要：随着国家政策对于药品、医疗器械创新的鼓励,我国开展的多中心临床试验和参与的国际多中心临床试验迎来了前所未有的发展契机。在越来越多的临床试验采用多中心设计的同时,我们需要看到目前存在的不足之处。本文从多中心临床试验设计、实施和报告三个阶段归纳汇总多中心临床试验面临的问题与挑战。从降低中心异质性、避免中心效应的角度出发,建议制定多中心临床试验的设计、实施和报告规范,以提高多中心临床试验质量。

摘要：项目教学法在我国高等设计教育中的应用由来已久,其应用也经历了从最初的热情参与到逐渐具有一定的科学性的过程。当下高校日渐注重项目教学法的应用,仍旧存在指导教师的能力培养、方法导入时机选择、项目来源等问题,需要解决。

摘要：苯并五元、六元氮杂环化合物具有刚性平面和大共轭结构,能在多种有机溶剂、混合溶液中发出特征荧光,且结构中的N、O、S杂原子可作为荧光探针的结合位点.因此,近年来苯并氮杂环化合物成为荧光探针领域研究焦点之一.从所用原料、合成方式、分子结构、作用机理等角度,重点介绍了苯并噁唑、苯并噻唑、苯并咪唑、吲哚及咔唑等苯并五元氮杂环,喹啉、苯并吡嗪、吩嗪等苯并六元氮杂环,以及两者共同构建的苯并多元氮杂环荧光探针的设计、合成,并综述了它们对小分子、金属阳离子、阴离子、pH等多种分析物的检测应用.

摘要：正交频分复用(orthogonal frequency division multiplexing,OFDM)信号具有较高的频谱效率,有利于实现高速传输。在卫星对地高码率数据传输系统设计中,OFDM有助于解决带宽资源的问题,因此极富吸引力。但是,由于近地轨道(low earth orbit,LEO)星地链路的大动态特性,传输信号会遭受严重的多普勒效应影响。对于宽带OFDM信号而言,多普勒效应的表现形式更为复杂,不再仅仅是频率的偏移。分析宽带OFDM信号在LEO卫星对地数传链路中所受到的多普勒影响。首先,对卫星数传链路进行数学建模,并且推导出该大动态场景下的OFDM信号模型;之后,量化分析由于多普勒效应所产生的符号间干扰和载波间干扰。根据理论分析结果,给出OFDM体制在LEO星地数传应用中的设计要求和设计局限。