1,721,295 research outputs found
Resonant chains in triple-planetary systems
Full text linkFil: Wang, Xuefeng. Nanjing University. School of Astronomy and Space Science; China.Fil: Wang, Xuefeng. Ministry of Education. Key Laboratory of Modern Astronomy and Astrophysics; China.Fil: Zhou, Li-Yong. Nanjing University. School of Astronomy and Space Science; China.Fil: Zhou, Li-Yong. Ministry of Education. Key Laboratory of Modern Astronomy and Astrophysics; China.Fil: Beaugé, Cristian. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina.Fil: Beaugé, Cristian. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Astronomía Teórica y Experimental; Argentina.A resonant chain may be formed in a multi-planetary system when ratios of the orbital periods can be expressed as ratios of small integers T1:T2:⋯:TN=k1:k2:⋯:kN. We investigate the dynamics and possible formation of resonant chain. The appropriate Hamiltonian for a three-planet resonant chain is defined and numerically averaged over the synodic period. The stable stationary solutions (apsidal corotational resonance, ACR) of this system, corresponding to the local extrema of Hamiltonian function, can be searched out numerically. The topology of the Hamiltonian around these ACRs reveals their stabilities. We further construct dynamical maps on representative planes to study the dynamics, and we calculate the deviation (χ2) of the resonant angle from the uniformly distributed values. Finally, the formation of resonant chain via convergent migration is simulated and stable configurations associated with ACRs are verified. We find that stable ACR families arising from circular orbits always exist for any resonant chain, and they may extend to high eccentricity. Around ACR solutions, regular motion are found in two types of resonant configurations. One is characterised by libration of both the two-body resonant angles and the three-body Laplace resonant angle, and the other by libration of only two-body resonant angles. The Laplace resonance seems not to contribute much to the stability. The resonant chain can be formed via convergent migration, and subsequently the resonant configuration evolves along the ACR families to eccentric orbits. Ideally, our methods introduced here can be applied to any resonant chain of any number of planets at any eccentricity.info:eu-repo/semantics/acceptedVersionFil: Wang, Xuefeng. Nanjing University. School of Astronomy and Space Science; China.Fil: Wang, Xuefeng. Ministry of Education. Key Laboratory of Modern Astronomy and Astrophysics; China.Fil: Zhou, Li-Yong. Nanjing University. School of Astronomy and Space Science; China.Fil: Zhou, Li-Yong. Ministry of Education. Key Laboratory of Modern Astronomy and Astrophysics; China.Fil: Beaugé, Cristian. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina.Fil: Beaugé, Cristian. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Astronomía Teórica y Experimental; Argentina
Proboscidactyla Brandt 1835
No full textGenus Proboscidactyla Brandt, 1835 Proboscidactyla Brandt, 1835: 228; Kramp, 1961: 233; Bouillon et al., 2006: 199; Schuchert, 2009: 456; Xu et al., 2014: 334. Willsia Forbes, 1846: 268. Type species: Proboscidactyla flavicirrata Brandt, 1835 Diagnosis. As for family.Published as part of Wang, Xuefeng, Lin, Kun, Xu, Zhenzu, Guo, Donghui & Huang, Jiaqi, 2019, Some new Hydroidomedusa (Cnidaria) from the northern South China Sea, pp. 191-205 in Zoological Systematics 44 (3) on page 198, DOI: 10.11865/zs.201923, http://zenodo.org/record/536645
Figures 7–11. Hydroidomedusa spp., line drawing. 7 in Some new Hydroidomedusa (Cnidaria) from the northern South China Sea
No full textFigures 7–11. Hydroidomedusa spp., line drawing. 7. Nubiella terminaliknoba Xu, Huang & Guo, sp. nov., lateral view. 8. Ditto, enlargement of marginal tentacle. 9. Paranubiella shenzhenensis Xu, Guo & Wang, sp. nov., lateral view. 10. Eucodonium crassonemalis Xu, Guo & Lin, sp. nov., lateral view. 11. Proboscidactyla trifurcata Xu, Huang & Guo, sp. nov., lateral view. Scale bars: 7 = 0.2 mm; 9–10 = 0.5 mm; 11 = 1.0 mm.Published as part of Wang, Xuefeng, Lin, Kun, Xu, Zhenzu, Guo, Donghui & Huang, Jiaqi, 2019, Some new Hydroidomedusa (Cnidaria) from the northern South China Sea, pp. 191-205 in Zoological Systematics 44 (3) on page 196, DOI: 10.11865/zs.201923, http://zenodo.org/record/536645
Figures 1–4 in Two new species of hydromedusa (Cnidaria) from the Leizhou Bay, the northern South China Sea
No full textFigures 1–4. Bougainvillia leizhouensis Xu, Guo & Wang, sp. nov. 1–2. Lateral views. 3. Dorsal view of gonads. 4. Part enlargement of the tentacular bulb. Scale bars = 0.5 mm.Published as part of Wang, Xuefeng, Lu, Liyi, Zhang, Shenzeng, Lin, Linkun, Xu, Zhenzu, Guo, Donghui & Huang, Jiaqi, 2021, Two new species of hydromedusa (Cnidaria) from the Leizhou Bay, the northern South China Sea, pp. 193-199 in Zoological Systematics 46 (3) on page 195, DOI: 10.11865/zs.2021301, http://zenodo.org/record/717571
Exploring the role of serious leisure in shaping entrepreneurial intention: Insights from higher education students in China
No full textOur study examines how serious leisure (SL) shapes entrepreneurial intention (EI) among Chinese university students. Grounded in Social Cognitive Career Theory (SCCT), we test a model in which SL enhances career adaptability (CA), which in turn fosters EI, with social support (SS) moderating the CA–EI link. A two-study design integrates external and internal validity: Study 1, a cross-sectional survey of 779 undergraduates from 28 Chinese universities, establishes construct validity and tests the hypothesised associations; Study 2, a 2 × 2 vignette experiment with 308 postgraduates, confirms causality and examines second-stage moderation. Findings consistently support the model: SL boosts EI both directly and indirectly via CA, and SS strengthens the CA–EI pathway. Theoretically, this research broadens SCCT by identifying SL participation as an informal yet significant adaptive career resource, especially when situated within enabling environments like China. Practically, it suggests that higher education institutions should recognise skill-based leisure as a scaffold for EI development. Methodologically, the sequential survey-experiment design provides a robust template for future research seeking ecological and causal validity in leisure, higher education, and entrepreneurship studies
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Advances in Steroid-Responsive Encephalopathy
No full textThis eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contac
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