稳中求变,感受命题新常态

文章对比分析了2018年全国Ⅰ卷理综化学试题,从中挖掘试题背后的教育价值,并在此基础上提出了针对高考复习的一些教学建议。     

基于资源共享与商业视角的大学城校际交通与物流发展模式探析——以花溪大学城为例

随着科技的创新与进步,“互联网+”时代迅速发展,大数据产业趋势越加明显,共享发展理念的普及更加广泛。共享经济、共享交通、共享物流、共享充电宝等词高频率地出现在人们的工作、学习、生活中。在“互联网+”时代背景下,以花溪大学城为例,综合花溪大学城校际交通、物流需求,分析花溪大学城校际交通物流问题现状及“互联网+”背景对花溪大学城校际交通物流共享问题改善的影响,在满足学生需求、迎合学生利益的前提下,基于资源共享与商业视角提出花溪大学城校际交通物流共享模式。     

红色资源融入高校学生党建工作的思考

红色资源是中国共产党带领广大人民群众在革命斗争和社会主义建设实践中创造的宝贵财富,也是开展高校学生党建工作的优质资源,对红色资源的挖掘利用,有利于指导高校学生党建工作。但是目前,红色资源在学生党建工作运用中仍存在不少问题,因此我们要创新红色资源的实施途径,使红色资源与时俱进,符合学生党建工作的需要。     

面向区域新业态的地方高校金属材料工程专业改造升级路径研究

本文从适应地方新业态的金属材料工程专业改造和升级路径出发,探索对接产业需求的人才培养模式,形成与信息技术深度融合兼有学科交叉特点的课程体系,探索具有新工科特色的专业人才培养质量评价体系,以期实现地方应用型高校传统工科专业的改造升级和跨越式发展。     

捕捉时代音符的“扶贫画家”

2019年11月26日,由安徽省美术家协会、阜阳市文学艺术界联合会主办的“我的扶贫日志:肖伯红水墨人物创作成果展”在北京市山水美术馆开幕。参加开幕式的中国文联国内联络部主任刘尚军、中国文联文学艺术基金会常务副秘书长郭希敏及一批书画名家对驻村工作队副队长肖伯红创作的系列乡村水墨人物作品,给予了充分肯定。展厅内一幅幅源自颍淮大地的水墨人物,用独特的视角,真实再现了社会主义新农村昂扬向上的时代旋律。这些散发着泥土气息的原生态乡村图景,令众多前来观展的各界人士为之喝彩!     

Anisotropic fluoride nanocrystals modulated by facet-specific passivation and their disordered surfaces

Rutile-type fluorides have been proven to be active components in the context of emerging antiferr-omagnetic devices. However, controlled synthesis of low-dimensional, in particular two-dimensional (2D), fluorides in a predictable and deterministic manner remains unrealized because of a lack of efficient anisotropic control, which impedes their further development in reduced dimensions. We report here that altered passivation of {110} growing facets can direct the synthesis of rutile-type fluoride nanocrystals into well-defined zero-dimensional (0D) particulates, one-dimensional (1D) rods and 2D sheets in a colloidal approach. The obtained nanocrystals show positive exchange bias and enhanced magnetic transition temperature from the coexistence of long-range antiferromagnetic order and disordered surface spins, making them strong alternatives for flexible magnetic devices and sensors.     

Dynamics and manipulation of ferroelectric domain walls in bismuth ferrite thin films

Ferroelectric domain walls differ from domains not only in their crystalline and discrete symmetry, but also in their electronic, magnetic, and mechanical properties. Although domain walls provide a degree of freedom to regulate the physical properties at the nanoscale, the relatively lower controllability prevents their practical applications in nano-devices. In this work, with the advantages of 3D domain configuration detection based on piezoresponse force microscopy, we find that the mobility of three types of domain walls (tail-to-tail, head-to-tail, head-to-head) in (001) BiFeO₃ films varies with the applied electrical field. Under low voltages, head-to-tail domain walls are more mobile than other domain walls, while, under high voltages, tail-to-tail domain walls become rather active and possess relatively long average lengths. This is due to the high nucleation energy and relatively low growth energy for charged domain walls. Finally, we demonstrate the manipulation of domain walls through successive electric writings, resulting in well-aligned conduction paths as designed, paving the way for their application in advanced spintronic, memory and communication nano-devices.     

Convergent genomic signatures of high-altitude adaptation among domestic mammals

Abundant and diverse domestic mammals living on the Tibetan Plateau provide useful materials for investigating adaptive evolution and genetic convergence. Here, we used 327 genomes from horses, sheep, goats, cattle, pigs and dogs living at both high and low altitudes, including 73 genomes generated for this study, to disentangle the genetic mechanisms underlying local adaptation of domestic mammals. Although molecular convergence is comparatively rare at the DNA sequence level, we found convergent signature of positive selection at the gene level, particularly the EPAS1 gene in these Tibetan domestic mammals. We also reported a potential function in response to hypoxia for the gene C10orf67, which underwent positive selection in three of the domestic mammals. Our data provide an insight into adaptive evolution of high-altitude domestic mammals, and should facilitate the search for additional novel genes involved in the hypoxia response pathway.     

实景演出的灯光特点及技术发展趋势

基于实践经验及应用案例,总结归纳户外大型实景演出的灯光特点、灯光技术发展趋势等。     

Olivine-norite rock detected by the lunar rover Yutu-2 likely crystallized from the SPA-impact melt pool

Chang’E-4 landed in the South Pole-Aitken (SPA) basin, providing a unique chance to probe the composition of the lunar interior. Its landing site is located on ejecta strips in Von Kármán crater that possibly originate from the neighboring Finsen crater. A surface rock and the lunar regolith at 10 sites along the rover Yutu-2 track were measured by the onboard Visible and Near-Infrared Imaging Spectrometer in the first three lunar days of mission operations. In situ spectra of the regolith have peak band positions at 1 and 2 μm, similar to the spectral data of Finsen ejecta from the Moon Mineralogy Mapper, which confirms that the regolith''s composition of the landing area is mostly similar to that of Finsen ejecta. The rock spectrum shows similar band peak positions, but stronger absorptions, suggesting relatively fresh exposure. The rock may consist of 38.1 ± 5.4% low-Ca pyroxene, 13.9 ± 5.1% olivine and 48.0 ± 3.1% plagioclase, referred to as olivine-norite. The plagioclase-abundant and olivine-poor modal composition of the rock is inconsistent with the origin of the mantle, but representative of the lunar lower crust. Alternatively, the rock crystallized from the impact-derived melt pool formed by the SPA-impact event via mixing the lunar crust and mantle materials. This scenario is consistent with fast-cooling thermal conditions of a shallow melt pool, indicated by the fine to medium-sized texture (<3 mm) of the rock and the SPA-impact melting model [Icarus 2012; 220: 730–43].