Large-scale multiferroic complex oxide epitaxy with magnetically switched polarization enabled by solution processing

Complex oxides with tunable structures have many fascinating properties, though high-quality complex oxide epitaxy with precisely controlled composition is still out of reach. Here we have successfully developed solution-based single-crystalline epitaxy for multiferroic (1-x)BiTi_(1-y)/2Fe_yMg_(1-y)/2O₃–(x)CaTiO₃ (BTFM–CTO) solid solution in large area, confirming its ferroelectricity at the atomic scale with strong spontaneous polarization. Careful compositional tuning leads to a bulk magnetization of 0.07 ± 0.035 μ_B/Fe at room temperature, enabling magnetically induced polarization switching exhibiting a large magnetoelectric coefficient of 2.7–3.0 × 10⁻⁷ s/m. This work demonstrates the great potential of solution processing in large-scale complex oxide epitaxy and establishes novel room-temperature magnetoelectric coupling in epitaxial BTFM–CTO film, making it possible to explore a much wider space of composition, phase, and structure that can be easily scaled up for industrial applications.     

Evolution and distribution of medullary bone: evidence from a new Early Cretaceous enantiornithine bird

Living birds are unique among vertebrates in the formation of a female-specific bone tissue called medullary bone (MB) that is strictly associated with reproductive activity. MB is a rapidly mobilized source of calcium and phosphorus for the production of eggshell. Among living taxa, its skeletal distribution can be highly extensive such that it even exists in the ribs of some species. Due to its ephemeral nature, MB is rarely fossilized and so little is understood with regard to the origin of MB and its skeletal distribution in early taxa. Here we describe a new Early Cretaceous enantiornithine bird, Mirusavis parvus, gen. et. sp. nov., indicating that skeleton-wide distribution of MB appeared early in avian evolution. We suggest that this represents the plesiomorphic condition for the Aves and that the distribution of MB observed among extant neornithines is a product of increased pneumatization in this lineage and natural selection for more efficient distribution of MB.     

黄河流域农村饮水安全问题及对策

21世纪以来中国农村饮水安全工程建设取得重大成就,截至2018年底,全国农村自来水普及率已达到80%以上,解决了绝大多数农村人口的安全饮水问题。然而黄河流域部分农村地区水资源短缺、水源水质差、饮水型地方病危害重、饮用水水源地缺乏保护和农村饮水安全工程不完善等问题突出,饮水安全保障工作相对于全国农村饮水安全工程进程较为滞后。为切实解决黄河流域农村人民群众的饮水安全问题,促进黄河流域生态保护和高质量发展,本文综述了目前黄河流域饮水安全突出的问题,并结合全国农村饮水提质增效的工作目标,提出了进一步做好流域内农村饮水安全工作的建议,包括实现水资源动态配置、加强饮水安全设施建设和工程管理、强化水源地保护与监测等,从优先保障饮用水水量和水质方面全面维护流域内农村地区的饮水安全。     

新药研发发展态势分析

新药研发是医药创新发展的关键环节,是新一轮生命科技革命和生物经济变革的核心领域,对引领科技创新、带动经济发展、提升人民健康福祉具有战略意义。当前,前沿技术不断革新、学科跨域融合、数字深度赋能驱动新药研发领域创新日趋活跃,国内外创新性小分子药物、抗体药物、免疫细胞治疗、基因治疗与核酸药物等密集获批上市,为未满足的临床需求提供更多选择。文章深入分析新药研发领域发展趋势、全球新药批准情况,以及我国新药研发发展现状与态势,提出发展启示与建议,以期为新药研发领域发展提供参考。     

吐蕃统治河陇西域时期的军事、畜牧业职官二题

吐蕃统治河陇西域时期在各地设立了扎论(dgra blon)之职,为军事官员,有不同级别,在汉文文书中被称为防城使,可能源于吐蕃本部,系吐蕃特有职官.吐蕃在河陇西域各地还设有上部、下部牧地大管理长(stod smad kyi phyug mavi gzhis pon chen po)、畜产大管理官(byang vtsho ched po)、副牧地管理长(gzhigs pon vog pon)、畜产小管理官(byung vtsho chung)等畜牧业官员,源自吐蕃本部,其中牧地管理长(gzhis pon)在汉文文书中被称为草宅使.归义军畜牧业职官受吐蕃影响甚深.     

图书馆构建学习型组织的实践与探索

结合工作实际,从安庆师范学院图书馆近5年来为什么要学习,怎样学习,学了些什么,学习带来哪些收获等4个方面,对构建学习型图书馆进行理论探索和实践上的总结。     

畸形之恋的叹息--试析《洛丽塔》主要人物的命运悲剧

《洛丽塔》是著名作家纳博科夫的代表作,描绘了少女与其继父之间的畸形之恋。通过对主要人物亨伯特、洛丽塔及对抗性人物黑兹太太和奎尔蒂的命运主线展开分析,诠释了悲剧发生的背景及深层次原因,同时解析了文中频频出现的“路”的意象。     

经典物理中不同参考系对称性与守恒定律前提等价性的讨论

从牛顿力学、分析力学和量子力学三个不同参考体系推导出的对称性与守恒间的关系,其前提条件虽不同,但其本质都是一致的。