1,721,264 research outputs found
A New Species Of The Genus Molothrognathus Summers And Schilinger (Acari: Trombidiformes: Caligonellidae) From Iran
No full textAhaniazad, M., Bagheri, M. (2012): A New Species Of The Genus Molothrognathus Summers And Schilinger (Acari: Trombidiformes: Caligonellidae) From Iran. Acarologia 52 (4): 373-376, DOI: 10.1051/acarologia/20122066, URL: http://dx.doi.org/10.1051/acarologia/2012206
Enhancing Atmospheric Monitoring Capabilities: A Comparison of Low- and High-Cost GNSS Networks for Tropospheric Estimations
Full text linkGlobal Navigation Satellite System (GNSS) signals experience delays when passing through the atmosphere due to the presence of free electrons in the ionosphere and air density in the non-ionized part of the atmosphere, known as the troposphere. The Precise Point Positioning (PPP) technique demonstrates highly accurate positioning along with Zenith Tropospheric Delay (ZTD) estimation. ZTD estimation is valuable for various applications including climate modelling and determining atmospheric water vapor. Current GNSS network resolutions are not completely sufficient for the scale of a few kilometres that regional climate and weather models are increasingly adopting. The Centipede-RTK network is a low-cost option for increasing the spatial resolution of tropospheric monitoring. This study is motivated by the question of whether low-cost GNSS networks can provide a viable alternative without compromising data quality or precision. This study compares the performance of the low-cost Centipede-RTK network in calculating the Zenith Tropospheric Delay (ZTD) to that of the existing EUREF Permanent Network (EPN), using two alternative software packages, RTKLIB demo5 version and CSRS-PPP version 3, to ensure robustness and software independence in the findings. This investigation indicated that the ZTD estimations from both networks are almost identical when processed by the CSRS-PPP software, with the highest mean difference being less than 3.5 cm, confirming that networks such as Centipede-RTK could be a reliable option for dense precise atmospheric monitoring. Furthermore, this study revealed that the Centipede-RTK network, when processed using CSRS-PPP, provides ZTD estimations that are very similar and consistent with the EUREF ZTD product values. These findings suggest that low-cost GNSS networks like Centipede-RTK are viable for enhancing network density, thus improving the spatial resolution of tropospheric monitoring and potentially enriching climate modelling and weather prediction capabilities, paving the way for broader application and research in GNSS meteorology
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
FIGURE 1 in Favognathus Hyrcanensis N. Sp., A New Species Of The Genus Favognathus (Acari: Trombidiformes: Cryptognathidae) From Northern Iran
No full textFIGURE 1: Favognathus hyrcanensis n. sp. (Female): A – Dorsal view of idiosoma; B – Ventral view of idiosoma.Published as part of Mohajer, S.S., Bagheri, M., Yazdanian, M., Saboori, A. & Saeej, S.P., 2014, Favognathus Hyrcanensis N. Sp., A New Species Of The Genus Favognathus (Acari: Trombidiformes: Cryptognathidae) From Northern Iran, pp. 193-199 in Acarologia 54 (2) on page 195, DOI: 10.1051/acarologia/20142127, http://zenodo.org/record/539849
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
Raphignathus Saboorii N. Sp. A New Species Of The Genus Raphignathus (Acari: Trombidiformes: Raphignathidae) From Northwest Iran
No full textGhorbani, H., Bagheri, M., Ueckermann, E.A., Navaei-Bonab, R., Mehrvar, A., Saber, M. (2011): Raphignathus Saboorii N. Sp. A New Species Of The Genus Raphignathus (Acari: Trombidiformes: Raphignathidae) From Northwest Iran. Acarologia 51 (4): 425-430, DOI: 10.1051/acarologia/20112025, URL: http://dx.doi.org/10.1051/acarologia/2011202
Evaluating Dual-Frequency, Multi-Constellation GNSS Performance of Modern Smartphones for Atmospheric Monitoring Across Mountainous and Urban Areas
Full text linkRecent advancements in Global Navigation Satellite System (GNSS) technology have enabled the integration of dual-frequency, multi-constellation capabilities into modern smartphones, significantly enhancing their potential for various applications beyond traditional navigation. One promising application is atmospheric monitoring, where GNSS-based observations—such as those of atmospheric water vapor—are used to improve weather forecasting, track climatic changes, and provide critical insights for environmental studies. However, the use of smartphones for GNSS-based atmospheric monitoring faces challenges, particularly in terms of signal reliability and accuracy, which can vary significantly depending on the surrounding environment. The authors aim to evaluate the performance of dual-frequency, multi-constellation GNSS capabilities in modern smartphones for atmospheric monitoring across both urban and rural environments, providing a comprehensive analysis of their accuracy, reliability, and potential limitations. Towards that, this paper presents a preliminary study on the feasibility of estimating the Zenith Tropospheric Delay at different environments and elevation through the collection of GNSS data from a flagship high-end Android smartphone equipped with dual-frequency (L1 and L5) and multi-constellation (GPS, Galileo, GLONASS, and BeiDou) capabilities and pitching it against a high performing commercial low-cost GNSS receiver. Preliminary results suggest that modern smartphones equipped with dual-frequency, multi-constellation GNSS are capable of promising accuracy for atmospheric monitoring, particularly in rural or high elevation areas with minimal obstructions. Our findings indicate that such smartphones have the potential to serve as low-cost, accessible tools for atmospheric monitoring, especially in open-sky rural environments where conditions are more favorable
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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