1,721,348 research outputs found
Data for: Photoelectrocatalytic oxidation of methanol over RuO2-MnO2-Co3O4 supported porous anatase under visible light irradiation
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Data for: Mesoporous silica from batik sludge impregnated with aluminum hydroxide for the adsorption and removal of bisphenol A and ibuprofen
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Data for: Hybrid nanocomposite of functionalized multiwall carbon nanotube, nitrogen doped graphene and chitosan with electrodeposited copper for the detection of anticancer drug nilutamide in tablet and biological samples
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Studies of platinum electrodeposition
No full textFurther studies of an electroplating solution consisting of [Pt(NH3)4](HPO4) in aqueous 30 mM Na2HPO4 at pH 10-10.4, known commercially as Q bath, have been carried out. Measurements of the steady state currents as a function of potential for a copper disc electrode in this solution confirm the conclusion from voltammetry at microelectrodes that the rate of reduction of [Pt(NH3)4]2+ to Pt depends strongly on temperature and is not mass transport controlled even at 368 K. Indeed, a temperature above 350 K is essential to see Pt plating at a significant rate. These observations are interpreted in terms of a mechanism involving ligand substitution prior to electron transfer and it is suggested that the electroactive species is [Pt(NH3)4-x(H2O)x]2+. The same experiments show that the rate of Pt deposition passes through a sharp maximum as the potential is made more negative. The decline negative to the peak is attributed to the adsorption of hydrogen atoms onto the Pt surface.Potential step experiments at 368 K show that the deposition of Pt occurs via progressive nucleation and three dimensional growth under electron transfer control. This is also consistent with the surface morphology observed by scanning electron microscopy. In general, several types of growth are identified by SEM. The electroplated layers may appear featureless, show large hemispherical centres, cauliflower growth or a deposit made up of small angular crystallites. Whether plated at constant current or constant potential, the morphology of the deposit is mainly determined by the potential for electrodeposition. The featureless deposits (formed at low constant current) are also highly reflecting but they are always highly stressed and readily crack on cooling from the plating temperature, particularly when thick. The deposit made up of angular crystallites were matt and sometimes black, never cracked and formed at potentials where hydrogen adsorption occurs. The cauliflower deposits were formed at intermediate potentials where the highest rates of deposition were observed. Constant potential deposition had several advantages over constant current deposition; satisfactory deposits could be formed with a fivefold higher rate and thick deposits were much less stressed. The morphology of the deposits is also influenced by the pre-treatment of the copper electrode surfaces.It has been reported that adherent and bright, thick deposits can be formed with high current efficiency only when the bath is operated at > 363 K, an inconveniently high temperature. In fact, although the aret of deposition is lower than at 368 K, it is possible to obtain reasonable electroplates with a good current efficiency at 358 K but it is almost essential to use constant potential deposition in order to obtain a significant rate of deposition. The improved rate of deposition at constant potential arises because of the peaked current-potential characteristic; with constant current deposition, the cathode always takes up a stable potential well to one side of the peak.</p
A sensitive electrochemical nitrate sensor based on polypyrrole coated palladium nanoclusters
No full textAbstract not available.M.R. Mahmoudian, Y. Alias, W.J. Basirun, Pei MengWoi, Farid Jamali-Sheini, M. Sookhakian, M. Silakhor
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
EFEKTIVITAS PENDISTRIBUSIAN DANA ZAKAT BAZNAS SIAK PADA PROGRAM BANTUAN PENDIDIKAN BAGI MAHASISWA
Full text linkABSTRAK Nama : Basirun Hasbullah Jurusan : Manajemen Dakwah Judul : Efektivitas Pendistribusian Dana Zakat Baznas Siak Pada Program Bantuan Pendidikan Bagi Mahasiswa Penelitian ini dilatarbelakangi oleh permasalahan kemiskinan yang terjadi pada masyarakat di Kabupaten Siak, dimana kemiskinan tersebut menjadi kendala bagi keluarga yang kurang mampu untuk melanjutkan pendidikan ke jenjang perguruan tinggi. Oleh karena itu, Baznas Kabupaten Siak mempunyai program bantuan pendidikan yang bertujuan membantu mahasiswa yang terkendala masalah biaya dan yang terancam putus kuliah. Adapun tujuan penelitian ini untuk mengetahui tingkat efektivitas pendistribusian dana zakat Baznas Siak pada program bantuan pendidikan bagi mahasiswa. Jenis penelitian ini adalah kuantitatif dengan menggunakan pendekatan deskriptif. Subjek penelitian ini adalah mahasiswa penerima program bantuan pendidikan tahun 2024 yang berjumlah 40 orang. Teknik pengumpulan data yang digunakan yaitu angket, dokumentasi serta observasi. Berdasarkan pada analisis data yang telah dilakukan, diperoleh kesimpulan bahwa pendistribusian dana zakat Baznas Siak “sangat efektif” pada program bantuan pendidikan bagi mahasiswa, dengan hasil persentase indikator efektivitas pendistribusian dana zakat (88,43%), serta indikator efektivitas program bantuan pendidikan (80,87%). Dari perolehan hasil persentase tersebut, diperoleh hasil rata-rata (mean) dengan persentase sebesar 84,65%. Kata Kunci: Efektivitas, Pendistribusian, Program Bantuan Pendidika
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