1,721,430 research outputs found
sj-docx-1-abs-10.1177_00027642221132805 – Supplemental material for Information Exposure and Information Overload as Antecedents of Crisis Communicative Responses and Coping: A Cross-Country Comparison
No full textSupplemental material, sj-docx-1-abs-10.1177_00027642221132805 for Information Exposure and Information Overload as Antecedents of Crisis Communicative Responses and Coping: A Cross-Country Comparison by Chih-Hui Lai and Tang Tang in American Behavioral Scientist</p
Direct laser writing of poly(phenylene vinylene) on poly(barrelene)
No full textThe ring-opening metathesis polymerization of barrelene (bicyclo[2.2.2]octa-2,5,7-triene) is described. The monomer was synthesized using an optimized route and characterized, for the first time, using X-ray diffraction analysis of a coordination complex. The solubility of poly(barrelene) was found to correlate with the ratio of cis to trans exocyclic vinylenes in the polymer backbone. Copolymers of barrelene and norbornene were also prepared and used to obtain robust films. The barrelene-containing polymers underwent spontaneous dehydrogenation under air or upon being subjected to laser pulses to afford poly(phenylene vinylene). A series of well-defined patterns with micrometer dimensions were created by direct laser writing on films of poly(barrelene-co-norbornene) and visualized by the fluorescence of the conjugated polymer that formed upon irradiation
which goes tang tang tang, which goes tang tang tang [first line of chorus]
No full textstrophic with choruspiano and voiceJohns Hopkins University, Levy Sheet Music Collection, Box
031, Item 110naSung by Miss Broadhurst, Miss Brett, & Mr. Tyler
which goes tang tang tang, which goes tang tang tang [first line of chorus]
No full textstrophic with choruspiano and voiceJohns Hopkins University, Levy Sheet Music Collection, Box
031, Item 110naSung by Miss Broadhurst, Miss Brett, & Mr. Tyler
Megadalton Macromolecules Made-to-Order in Minutes: A Highly Active Nanosphere Catalyst for Preparing High-Molecular Weight Polymers
Full text linkA rhodium(I)-based polymer, [Rh2(cyclooctatetraene)-Cl2]n, was used as a heterogeneous catalyst to prepare stereoregular poly(phenylacetylene) under ambient conditions and within short periods of time. Ultrahigh-molecular weight polymers were obtained when silica and an amine were added to the reaction mixture. The additives promoted catalytic activity as the silica functioned as a support, while the amine induced the depolymerization of the polymer catalyst into its monomeric components. Kinetic analyses in conjunction with molecular weight measurements revealed that the polymerization reaction proceeded in a chain-growth fashion. The poly(phenylacetylene)s were analyzed using a series of tensile tests and found to be mechanically robust (sigma = 20.1 MPa and E = 2.0 GPa). Features intrinsic to the catalyst facilitated the realization of a novel "injection polymerization" method in which passing monomer through catalyst-loaded cartridges rapidly and conveniently afforded high-molecular weight polymer fibers
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
Agarose-Based Hierarchical Porous Carbons Prepared with Gas-Generating Activators and Used in High-Power Density Supercapacitors
Full text link© 2021 The Authors. Published by American Chemical Society.Due to their high surface areas and large pore volumes, porous carbons (PCs) are valuable materials for use as electrodes in energy storage and conversion devices. Biomass is an ideal precursor for the preparation of PCs in part because it is sustainable and eco-friendly. Herein, new methodology for converting agarose, a naturally occurring type of biomass that forms robust hydrogels, into PCs with tunable pore structures and high electrochemical performance is described. The synthetic process is straightforward and entails heating a gel that is composed of agarose and potassium oxalate (K2C2O4). Since the salt transforms into gaseous byproducts at elevated temperatures, the decomposition process was harnessed to create activated, open pores as the hydrogel underwent carbonization. For example, a PC with a surface area of 1754.9 m2 g-1 and a pore volume of 2.643 cm3 g-1 was obtained by heating a mixture of agarose and K2C2O4 in a 1:3 weight ratio at 700 °C. The material was subsequently used as the electrode material in a supercapacitor and found to display a specific capacitance of 166.0 F g-1 at 0.125 A g-1. Varying the quantity of added K2C2O4 resulted in predictable changes in porosity and thus offered a means to tune the textural properties and the electrochemical performance of the PCs. For example, changing the feed ratio of agarose to K2C2O4 to 1:6 afforded a PC that exhibited a high persistent specific capacitance (64.1 F g-1 at 5 A g-1 after 10,000 cycles) and a high-power density (20 kW kg-1 at 10 A g-1).11Nsciescopu
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