1,720,973 research outputs found
INHIBISI KOROSI DAN PEMULIHAN SIFAT MEKANIK BAJA LUNAK MENGGUNAKAN EKSTRAK KULIT BUAH KAKAO (Theobroma cacao) DALAM MEDIA ASAM
No full textSynthesis of Cuprum (Cu) Layer by Electrodeposition Method with Theobroma cacao Peels as Corrosion Protector of Steel
Get PDFCorrosion is a natural phenomenon that can not be prevented the process of occurrence, but the timing may be delayed. Various efforts have been made in reducing the impact of losses caused by corrosion. One such effort is to coat the metal surface with a thin layer. As well as other efforts is to use an inhibitor. Efforts have been made to reduce the impact of corrosion loss by synergizing surface coating and using of inhibitors. Deposition of a thin layer of Cu using electrodeposition method with 0.05 M CuSO4.5H2O electrolyte solution and addition of inhibitor of Theobroma cacao peels extract. In this research has been done some variation that is variation of electrodeposition time and variation of concentration of inhibitor of Theobroma cacao peels extract. Scanning Electron Microscope (SEM) characterization shows electrodeposition of a thin layer of Cu for three minutes, a voltage of three volts, and with the addition of an inhibitor of Theobroma cacao peels extract 1% producing a smooth, homogeneous and more uniform surface morphology. Based on the result of characterization with X-Ray Diffraction (XRD) obtained steel surface at electrodeposition with the addition of an inhibitor of Theobroma cacao peels extract, there are sharper peaks of Cu. Based on the corrosion test obtained value of Inhibition Efficiency inhibitor of Theobroma cacao peels extract amounted to 69.4% with the addition of 1%, and 81.9% with the addition of inhibitor 1.5%. Â Based on this, inhibitor of Theobroma cacao peels extract can reduce the attack rate of corrosion on the steel surface in corrosive media HCl 1N
INHIBISI KOROSI DAN PEMULIHAN SIFAT MEKANIK BAJA LUNAK MENGGUNAKAN EKSTRAK KULIT BUAH KAKAO (Theobroma cacao) DALAM MEDIA ASAM
No full textInhibisi korosi dan sifat-sifat adsorpsi oleh ekstrak kulit buah kakao (Theobroma cacao) pada baja lunak dalam larutan HCl 1,5 mol/L dipelajari menggunakan teknik metode berat hilang (weight loss), polarisasi potensiodinamik (Tafel), dan Electron Impedance Spectroscopy. Variabel penelitian adalah konsentrasi ekstrak 0,5-2,5% dengan selang 0,5%, waktu, dan rentang suhu 30-50 red, dan LC-MS dilakukan untuk mengetahui senyawa ekstrak yang berperan dalam proses inhibisi. Sedangkan XPS dan XRD dilakukan untuk mengetahui adsorpsi yang terjadi di permukaan baja lunak. Morfologi permukaan dari sampel diamati dengan menggunakan scanning elektron microscopy dengan energy dispersive X-ray spectroscopy (SEM-EDX)
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
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