1,720,954 research outputs found
The Effect of Inorganic-Organic Physicochemical Properties on CCN Activity of Complex Mixtures
No full textAerosol effects on Earth’s climate are a major source of uncertainty in predictions of radiative forcing. The physical and chemical composition of aerosols modify cloud reflectivity and lifetime, which exert a strong, but uncertain, cooling effect on the climate; this indirect effect is attributed to aerosols’ ability to form cloud condensation nuclei (CCN). Aerosol particles are often mixtures of inorganic and organic components, and their composition impacts their water-uptake, hygroscopicity and droplet formation. Atmospheric organic aerosol have a wide range of thermodynamic physicochemical properties, therefore introducing complexity in hygroscopicity and droplet formation predictions. To shed light on complex aerosols, this thesis uses laboratory based measurements and characterization techniques to elucidate organic physicochemical property effects on aerosol water uptake. Results of this work will better inform current hygroscopicity models. One such property is an organic compound’s ability to partition to the surface (hence, surface-activity). Organic partitioning can be enhanced during organic-inorganic interactions, known as salting out effects. The effects of salting-out and surface-active organic partitioning on water uptake of mixed organic-inorganic aerosols are investigated. Furthermore, we introduce new computationally efficient parameterizations for subsaturated and supersaturated droplet growth and CCN predictions. Results also show that both organic functional group and aerosol viscosity can also influence salting out and salting-in effects. Specifically, these properties can be predicted and influence the presence of liquid-liquid phase separation (LLPS) and subsequent aerosol water uptake processes. This work finds that organic functional groups, especially for nitrogen containing species, drive interactions with inorganic components; these interactions result in experimental water uptake that deviates from traditionally used hygroscopicity models. Therefore, organic functional groups and internal aerosol phase morphology are critical to improving our scientific understanding of aerosol-climate effects
Data Set for Hygroscopicity of Isoprene-Derived Secondary Organic Aerosol Mixture Proxies: Importance of Solute Diffusion and Salting-In Effects
No full textSurface tension measurements were obtained using a pendant drop tensiometer over a length of 300 seconds, using the methodology of Fertil et al., 2025
CCN measurements were obtained using a DMT Cloud Condensation Nuclei Counter using the Scanning Mobility CCN Analysis (SMCA) method (Moore et al., 2010). Data obtained was then analyzed using the PyCAT analysis toolkit available for public use (last access: August 27, 2025; https://doi.org/10.5281/zenodo.6329787; Gohil, 2022; Gohil and Asa-Awuku 2022)Raw data (surface tension and cloud condensation nuclei counter (CCNC) measurements) files for publication "Hygroscopicity of Isoprene-Derived Secondary Organic Aerosol Mixture Proxies: The Importance of Solute Diffusion and Salting-In Effects"NSF AGS #2124489https://doi.org/10.5194/egusphere-2025-193
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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