A New Rhamphorhynchid Pterosaur (Pterosauria) from the Middle Jurassic Tiaojishan Formation of Western Liaoning, China

A new Sordes-like pterosaur Jianchangopterus zhaoianus gen. et sp. nov. is erected based on a almost complete skeleton with skull preserved. It is characterized by the following characters: seven and six pairs of upper jaw and lower jaw teeth respectively; the development of a recess on maxilla; the evenness of the dental margin in lateral view; a distinct central ridge along dorsal surface of the mandibular symphysis; wing phalanx 4 with strongly curved shaft approximately 96% the length of the wing phalanx 1. The discovery of a Sordes-like pterosaur Jianchangopterus, and other taxa from the same formation indicates that pterosaurs reached great diversities during the Middle to Upper Jurassic period.     

地球重力场的最新高分辨率模型

利用多颗人造地球卫星轨道数据和最新公布的全球地面及海洋重力资料,借助地球重力场的球谐表达式,建立了１９９６高分辨率的地球重力场模型。     

对就地养老的反思——“人”与“地方”关系视角①

在有关养老的老年学和地理学研究中,“就地养老”是一个广泛使用的概念,并一直被认为是解决老龄人口养老需求的有效政策手段。迄今为止,关于就地养老的研究主要关注了很多能够让老年人健康就地(或在家)养老的物质方面的因素,比如住房条件或家庭照护。有些老年学研究者们认识到,就地养老受到居住环境中实体环境和社会、情感因素的共同影响。但我们认为,在养老体验研究中,要更加深入地审视“人”和“地方”之间的复杂关系。特别是,我们主张就地养老成功的因素是地方具有维持良好关系的潜力。提到“地方(place)”一词的时候,人们过分局限于关注老年人身体上接近的地理空间,或是具有实体边界的地方,例如房子或社区。而我们通过回顾现有文献发现,对许多选择就地养老的人来说,更具有意义的是随着时间的推移,他们在不同空间尺度上所建立起来的多元的、网络化的社会和非社会关系。基于这个新的视角,可以更好地理解老年人与地方的多层次的联系,以及从不同尺度和不同类型的人与地方的关系来考察就地养老的意义。     

大气CO2浓度变化与生物群系气候异常之间的关联分析

自工业革命以来全球化石燃料燃烧释放到大气中的CO2持续升高,但大气中CO2的增长速率却并没有相应地增加。造成这种差异的原因,尤其是造成大气CO2浓度年际变化的驱动因素以及其空间位置,目前还存在很大的争议。基于全球气候数据及相关的遥感数据,对1986-1995年大气CO2浓度增长速率（CGR）与生物群系气候异常之间的关联进行了分析。结果表明：常绿阔叶林、C4森林草地、C4草地以及针叶林与林地这4种生物群系是主要的气候异常敏感区域,其碳源,碳汇的年际变化影响着大气CO2浓度的增长速率。虽然这些影响在特征和数量上存在差异,但它们有时也会对大气CO2浓度增长速率表现出共同的作用。如厄尔尼诺年（1987年）大气CO2浓度的增长速率非常大,而造成这种现象的原因是热带生物群系（常绿阔叶林、C4森林草地、C4草地）对于厄尔尼诺年温度变化的响应。     

Experimental clearance rate and intraguild predation of jellyfish Cyanea nozakii

Cyanea nozakii, a common jellyfish distributed in offshore China, has a complex trophic relationship with other zooplankton groups. However, few studies have reported the predation rates and prey selection patterns of C. nozakii medusae on different prey items. Research is also lacking on the intraguild predation of Aurelia coerulea(another common bloom jellyfish in offshore China) by C.nozakii. To address the knowledge gaps, the clearance rates of C. nozakii for different prey items,including c...     

Identifying Symbiotic Stars with Machine Learning

Symbiotic stars are interacting binary systems, making them valuable for studying various astronomical phenomena, such as stellar evolution, mass transfer, and accretion processes. Despite recent progress in the discovery of symbiotic stars, a significant discrepancy between the observed population of symbiotic stars and the number predicted by theoretical models. To bridge this gap, this study utilized machine learning techniques to efficiently identify new symbiotic star candidates. Three algo...     

Seasonal co-occurrence patterns of bacteria and eukaryotic phytoplankton and the ecological response in urban aquatic ecosystem

Microorganisms play a key role in aquatic ecosystems. Recent studies show that keystone taxa in microbial community could change the community structure and function. However, most previous studies focus on abundant taxa but neglected low abundant ones. To clarify the seasonal variation of bacterial and microalgal communities and understand their synergistic adaptation to different environmental factors, we studied the bacterial and eukaryotic phytoplankton communities in Fenhe River that runs t...