1,720,972 research outputs found
Constructing cropland ecological stability assessment method based on disturbance-resistance-response processes and classifying cropland ecological types
No full texthttp://dx.doi.org/10.13039/501100001809 National Natural Science Foundation of Chin
Developing an Integrated Risk Assessment Method for Ecological Protection Redlines to Optimize Ecological Protection Policies: Based on a Multidimensional Assessment Framework and Risk Path Analysis
No full textABSTRACT As urbanization and industrialization advance, China faces increasingly severe ecological challenges. The Ecological Protection Redline (EPR) policy is a crucial tool for land use management and ecological protection but requires a comprehensive risk assessment method to address ongoing challenges. This study integrated multiple factors with ecological resilience theory to establish a “Hazard‐Exposure‐Vulnerability‐Damage‐Final Risk” framework, assessing the spatiotemporal dynamics and risks of different EPR types in Qinghai Province over 20 years. Path analysis was further used to reveal relationships between risk stages. Results show increasing hazards and exposure in Water Conservation (WC), Biodiversity Maintenance (BM) and Land Desertification (LD) EPR types, with improved water conservation, stable biodiversity, and controlled desertification vulnerability across regions. Integrated risk results show a downward risk trend in WC type, BM type fluctuated but improved, and an initial increase followed by risk decrease in LD type. Path analysis revealed that damage in WC‐type EPR was driven by direct hazard impacts, BM‐type EPR by vulnerability, and damage in LD‐type EPR by indirect effects of hazard through exposure. This study emphasizes the optimization of EPR policies by reducing external disturbances and enhancing ecosystem resilience, providing policy recommendations and practical experience for ecological protection and sustainable land use management.China Scholarship Council https://doi.org/10.13039/501100004543National Natural Science Foundation of China https://doi.org/10.13039/50110000180
Response of carbon balance change and carbon imbalance risk to trade-off and synergy of urbanization-ecological construction in Qinghai-Tibet Plateau
No full texthttp://dx.doi.org/10.13039/501100001809 National Natural Science Foundation of Chinahttp://dx.doi.org/10.13039/501100004543 China Scholarship Counci
Blazed subwavelength grating coupler
No full textShort-wavelength mid-infrared (2–2.5 μm wave band) silicon photonics has been a growing area to boost the applications of integrated optoelectronics in free-space optical communications, laser ranging, and biochemical sensing. In this spectral region, multi-project wafer foundry services developed for the telecommunication band are easily adaptable with the low intrinsic optical absorption from silicon and silicon dioxide materials. However, light coupling techniques at 2–2.5 μm wavelengths, namely, grating couplers, still suffer from low efficiencies, mainly due to the moderated directionality and poor diffraction-field tailoring capability. Here, we demonstrate a foundry-processed blazed subwavelength coupler for high-efficiency, wide-bandwidth, and large-tolerance light coupling. We subtly design multi-step-etched hybrid subwavelength grating structures to significantly improve directionality, as well as an apodized structure to tailor the coupling strength for improving the optical mode overlap and backreflection. Experimental results show that the grating coupler has a recorded coupling efficiency of −4.53 dB at a wavelength of 2336 nm with a 3-dB bandwidth of ∼107 nm. The study opens an avenue to developing state-of-the-art light coupling techniques for short-wavelength mid-infrared silicon photonics
Modeling of soil organic carbon stock and sequestration potential in grassland and cropland in Qinghai-Tibet Plateau: prediction and carbon management strategies based on different climate scenarios
No full texthttp://dx.doi.org/10.13039/501100001809 National Natural Science Foundation of Chinahttp://dx.doi.org/10.13039/501100002860 China Sponsorship Councilhttp://dx.doi.org/10.13039/501100004543 China Scholarship Counci
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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