1,720,976 research outputs found
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
Metal supported poly (sodium 4-styrene sulfonate) (PSS) synthesis, characterization and application areas of polyaniline
No full textBu tez çalışmasında, Polianilin (PANI), Nötral Polianilin (NPANI), çinko iyonu katkılanmış nötral polianilin (NPANI-Zn2+) ve metal destekli PSS katkılanmış polianilin (NPANI-Zn2+-PSS) iletken polimerleri sentezlenmiştir. İlk defa, Zn2+ iyonu varlığında ve asitsiz ortamda polianilin polimeri sentezlendi. Bu sentezde, proton asidi yerine Zn2+ iyonu kullanıldı (anilin sadece asidik ortamlarda polimerleştirilmektedir). Bilindiği gibi, Zn2+ iyonu Lewis asidi özelliğine sahiptir. Polimerlerin sentezinde yükseltgen olarak amonyum peroksidi sülfat, (NH4)2S2O8 tuzu kullanılmıştır. Sentezlenen polimerler, taramalı elektron mikroskobu (SEM), X-ışını kırınım difraktometresi (XRD), enerji dağılımlı X-ray spektrometresi (EDS), fourier dönüşümlü infrared spektroskopisi (FTIR), ultraviyole-görünür bölge spektrofotometresi (UV– gör), termal analiz (TGA, DTA) ve elektriksel iletkenlik ölçümleri yöntemleri kullanılarak karakterize edilmişlerdir. Yapılan çalışmalar, polianilin polimerine Zn2+ iyonu ve Zn2+ iyon desteği ile PSS'nin katkılandığını göstermiştir. Sentezlenen polimerlerin kirletici bir boya olan metilen mavisinin bozunması üzerinde fotokatalitik aktiviteleri incelenmiştir. Polimerlerin fotokatalitik etkilerine, kirletici miktarı, zaman, karanlık ortam ve UV ışığının etkisi ayrı ayrı araştırılmıştır. Elde edilen deneysel sonuçlar, kirletici miktarının, zamanın ve UV ışığının fotokatalitik bozunma üzerine etki ettiğini göstermiştir.In this thesis study, conductive polymers, which are polyaniline (PANI), neutral polyaniline (NPANI), zinc ion doped neutral polyaniline (NPANI-Zn2+) and metal supported PSS-doped polyaniline (NPANI-Zn2+-PSS) were synthesized. For the first time, polyaniline conducting polymer was also synthesized in the presence Zn2+ ion and in the without proton acid media. Zn2+ was used instead of the proton acid in this synthesis (aniline is only polymerized in acidic medias). As it was known, the Zn2+ ion has Lewis acidity property. Ammonium peroxy disulfate, (NH4)2S2O8 was used as the oxidant in the synthesis of the polymers. Synthesized polymers are characterized using by scanning electron microscopy (SEM), X-ray diffraction diffractometry (XRD), energy dispersive X-ray spectrometry (EDS), fourier transform infrared spectroscopy (FTIR), ultraviolet-visible region spectrophotometer (UV-vis), thermal analysis (TGA, DTA) and method of measuring electrical conductivity. Spectroscopic studies have shown that polianiline polymer is doped with Zn2+ ion and PSS with Zn2+ ion support. In addition, the photocatalytic activities of the synthesized polymers have been investigated on the degradation of methylene blue, which is a contaminating dye. The amount of pollutants, time, dark environment and UV light effect were individually investigated on the photocatalytic effects of the polymers. The experimental results obtained have shown that time, UV light and the amount of pollutants effect on photocatalytic degradation of dye
Anilin, tiyofen, 3-metil tiyofen ve pirolmonomerlerinden iletken polimer sentezi, karakterizasyonu ve fotokatalitik özelliklerinin incelenmesi
No full textProje -- Kırıkale Üniversitesi2013/22108654
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
Metal oksitli ve metal oksitsiz ortamlarda polianilin sentezi, karakterizasyonu ve fotokatalitik etkisinin i·ncelenmesi
Full text linkTez çalışmasında, iletken polimer olan polianilin metal oksitli ve metal oksitsiz olmak üzere iki farklı ortamlarda sentezlenmiştir. Elde edilen polimerler FTIR, SEM, EDAX, XRD ve iletkenlik ölçümleri ile karakterize edilmiştir. İletkenlik ölçümleri four probe yöntemi ile yapılmıştır. Sentezlenen polimerler ve polimer sentezinde kullanılan metal oksitler kullanılarak kirletici bir boya olan metilen mavisinin bozunması üzerinde fotokatalitik aktiviteleri incelenmiştir. Polimerlerin ve metal oksitlerin fotokatalitik etkilerine, kirletici miktarı, zaman, karanlık ortam ve UV ışık etkisi ayrı ayrı araştırılmıştır. Elde edilen deneysel sonuçlar, kirletici miktarının, zamanın ve UV ışığının fotokatalitik bozunma üzerine etki ettiğini göstermiştir. Ayrıca fotokatalitik etki üzerine polimer ve yarı iletken özellik gösteren yarı iletken metal oksitlerin band gap aralıklarının da etki ettiği belirlenmiştir.In this thesis study, the polyaniline conductive polymers were synthesized in two different environments, including metal oxide and metal oxide-free. Polymers obtained were characterized by using FTIR, SEM, EDAX, XRD and conductivity measurements. Conductivity measurements were performed with four probe method. The synthesized polymers and photocatalytic activity of the metal oxides used in polymer synthesis on the degradation of pollutants methylene blue dye were examined. The effect of the pollutants amount, time, UV light and dark on the photocatalytic effect of polymers and metal oxides were investigated individually. The obtained experimental results shown that the amount of contaminants, time and UV light has an influence on the photocatalytic decomposition. In addition, it was determined that the band gap range of polymer and metal oxide, having semiconductor properties, affect the photocatalytic effect
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
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
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