摘要：随机选取无明显症状的进境大豆样品,提取植物总RNA,根据NCBI已发布的苜蓿花叶病毒(alfalfa mosaic virus,AMV)全基因组序列,设计特异性引物和探针,应用RT-PCR、实时荧光RT-PCR、序列分析等方法对该批次大豆进行检测。结果表明,RT-PCR能够扩增出特异条带,实时荧光PCR反应出现明显扩增曲线,PCR产物序列与AMV阿根廷株系(GenBank登录号:MW835977.1)相似度达到99.71%。根据上述检测结果,得出该批大豆样品中含有苜蓿花叶病毒。这是我国口岸首次在埃塞俄比亚进境大豆中截获苜蓿花叶病毒。

摘要：建盏作为宋代造物艺术的典型代表,包含除了技术以外的相关民俗、文化等诸多社会因素,具有较好的代表性,为研究宋代当时的造物思想和设计文化提供了较好的研究范例,从中不仅可以解析当时的技术水平和制造工艺,还可以厘清建盏中所蕴含的造物观和文化因素,本文以建盏为例,研究其造物思想之来源和诸多形成因素,试为后续课题研究提供可靠的实例支撑。

摘要：The orbitofrontal cortex(OFC)is involved in diverse brain functions via its extensive projections to multiple target *** is a growing understanding of the overall outputs of the OFC at the population level,but reports of the projection patterns of individual OFC neurons across different cortical layers remain ***,by combining neuronal sparse and bright labeling with a whole-brain florescence imaging system(fMOST),we obtained an uninterrupted three-dimensional whole-brain dataset and achieved the full morphological reconstruction of 25 OFC pyramidal *** compared the wholebrain projection targets of these individual OFC neurons in different cortical layers as well as in the same cortical *** found cortical layer-dependent projections characterized by divergent patterns for information *** study not only provides a structural basis for understanding the principles of laminar organizations in the OFC,but also provides clues for future functional and behavioral studies on OFC pyramidal neurons.

摘要：The ability to controlled introduction of defects, particularly twin defects in Pt-based nanocrystals （NCs） provides a possibility to regulate the performance of Pt-based nanocatalyst. However, because of the high internal strain energy existed in twinned structures, the fabrication of defects in Pt-based NCs is sufficiently challenging. Here we demonstrate a ＂low-temperature interface-induced assembly＂ approach that provides precise control over Pt-Cu nanoparticles assembled at the hexadecylamine/water interface, yielding onion-like Pt-Cu NCs exposed a high density of twin defects. Moreover, a bending mechanism is proposed to elucidate the appearance of twin defects and lattice expanding （contraction） based on aberration corrected scanning transmission electron microscopy analysis. This work opens new routes to engineer defects in metal- based alloy NCs, enabling more opportunities in catalysis.

摘要：Novel CdSe quantum dot （QD）-sensitized Au/TiO2 hybrid mesoporous films have been designed, fabricated, and evaluated for photoelectrochemical （PEC） applications. The Au/TiO2 hybrid structures were made by assembly of Au and TiO2 nanoparticles （NPs）. A chemical bath deposition method was applied to deposit CdSe QDs on TiO2 NP films with and without Au NPs embedded. We observed significant enhancements in photocurrent for the film with Au NPs, in the entire spectral region we studied （350-600 nm）. Incident-photon-to-current efficiency （IPCE） data revealed an average enhancement of 50%, and the enhancement was more significant at short wavelength. This substantially improved PEC performance is tentatively attributed to the increased light absorption of CdSe QDs due to light scattering by Au NPs. Interestingly, without QD sensitization, the Au NPs quenched the photocurrent of TiO2 films, due to the dominance of electron trapping over light scattering by Au NPs. The results suggest that metal NPs are potentially useful for improving the photoresponse in PEC cells and possibly in other devices such as solar cells based on QD-sensitized metal oxide nanostructured films. This work demonstrates that metal NPs can serve as light scattering centers, besides functioning as photo-sensitizers and electron traps. The function of metal NPs in a particular nanocomposite film is strongly dependent on their structure and morphology.

摘要：为了降低住院患者跌倒产生的严重后果,本文设计一种腕部穿戴的实时跌倒检测系统,系统以微处理器NRF52840为核心,采用惯性传感器LSM6DSOX和气压计BMP390采集数据。本文提出一种基于合角速度判断设备静止时刻来校准气压计估计的高度变化的方法,获得了更准确的高度变化数据。在算法上,本文提出改进的事件检测方法和决策树模型结合的方法,提高了跌倒检测的准确率。设备最终在床上跌倒、向前跌倒等4种跌倒和走、鼓掌、侧平举等9种日常行为的分类中实现了97.94%的准确度,可帮助护士实现对跌倒住院患者及时救助。

摘要：能量转换效率是限制同步感应线圈发射器(synchronous induction coil launcher,SICL)发展的关键因素。为了提高效率,在线圈发射器设计过程中必须对电源参数、驱动线圈的结构参数,以及电枢触发位置等多个因素进行综合考虑。基于正交试验法对同步感应线圈发射器关键设计参数的选择进行研究,采用场路耦合方法对一个3级同步感应线圈发射器的参数设计及能量转换效率进行了分析。计算结果表明,在该设计方法下,导线直径和线圈内径是影响电磁线圈发射器设计的两大关键因素,在发射器设计中应结合实际情况予以重点考虑;线圈匝数和触发位置、以及线圈长度对系统的影响表现并不明显。

摘要：诸如卫星、雷达、飞行器等复杂产品研发普遍采用'分解—综合'的设计模式以降低研发的复杂程度,但复杂系统分解得到的分系统之间、分系统内部组件之间及其不同学科之间在研发过程中相互关联,造成研发活动之间数据交互复杂,研发活动迭代频繁,使得产品研发过程分析、管理困难。针对复杂产品采用的'分解—综合'设计模式,基于系统层次分解定义不同级别组件对应的研发活动、计算模型和指标参数,进而基于系统架构建立层次化设计结构矩阵(Multi-level design structure matrix,MDSM),利用层次化设计结构矩阵分析不同层次的研发活动之间的数据依赖关系,并自动生成复杂产品研发流程的过程逻辑,最终实现基于输入/输出数据模板和消息驱动的层次化、模块化、集成化的复杂产品研发全局流程模型。

摘要：在室温太赫兹探测技术领域中,热敏微桥结构的太赫兹探测器具有探测波段宽、阵列规模大、集成度高、实时成像等显著特点。文中对室温太赫兹探测技术、基于热敏材料的太赫兹探测技术国内外发展现状进行了综述,分析了基于氧化钒薄膜微桥结构的非制冷长波红外焦平面探测技术,存在着太赫兹波低吸收探测性能弱的不足,针对太赫兹波探测进行优化设计,同时介绍了电子科技大学在太赫兹探测阵列吸收结构方面的部分研究工作。

摘要：流场可视化作为科学可视化领域发展最早、应用最广泛的研究方向,在帮助用户分析和理解复杂流场流动机理,洞察流场物理现象并发现流动科学规律方面发挥着重要的支撑作用.其中感知增强类流场可视化方法能够有效展现流场结构特征、各属性间的相互作用及其复杂的流动物理现象,为用户提供良好的流场可视化分析环境,提高流场科学数据处理效率和可视分析能力.文中主要介绍了感知增强类流场可视化方法在工业设计、航空航天、生物医学以及其他交叉领域的应用.抽象领域专家分析理解流场物理现象,洞察流场数据集中蕴含的复杂物理规律的过程,提出一个自顶向下的VCIH分析流程模型,包括视觉接收、认知构建、交互参与和硬件辅助.以VCIH模型为指导,从视觉感知增强、流场物理过程增强、探索式交互增强和硬件依赖性增强4个方面综述了感知增强类流场可视化方法的研究现状,并结合应用需求展望未来的发展趋势.