1,720,955 research outputs found
Ekstraksi Zat Warna Kulit Terong Ungu (Solanum Melongena L) Untuk Aplikasi Pada Dye Sensitized Solar Cell (DSSC)
Full text linkDye sensitized Solar Cell (DSSC) adalah energi alternatif dengan memanfaatkan
cahaya matahari. Selain itu DSSC merupakan sel surya berbasis fotoelektrokimia.
Pada penelitian ini menggunakan kulit terong ungu sebagai sumber zat warna alami.
Penelitian ini bertujuan untuk mengetahui nilai efesiensi DSSC dengan menggunakan zat warna dan semikonduktor yaitu TiO2 yang terstabilkan.Zat warna diperoleh dari hasil ekstraksi menggunakan HCL 10% dan pelarut metanol dengan metode maserasi selama empat hari. Zat warna yang distabilkan dengan menvariasikan pH antara 2,4,6,8. Semikonduktor TiO2 distabilkan dengan menggunakan polivinil alkohol.
Nilai konversi energi matahari menjadi energi listrik paling tinggi dihasilkan oleh ekstrak zat warna kulit terong ungu pH 2 sebesar 0,71%. Karakterisasi zat warna yang dilakukan menggunakan analisis UV-Vis pH 2 diperoleh panjang gelombang 288 nm, FTIR diperoleh beberapa jenis ikatan yaitu Ar-OH, C-H, dan C=C serta uji skrining fitokimia diperolah senyawa golongan flavonoid dan alkaloid
SISTEM PENGAMBILAN KEPUTUSAN PENERIMAAN SISWA BARU PADA MA. SABILAL MUHTADIN TEMBILAHAN HULU MENGGUNAKAN METODE ANALYTICAL HIERARCHY PROCESS (AHP) STUDI KASUS : MA. SABILAL MUHTADIN TEMBILAHAN HULU
No full textPenelitian ini mengembangkan sistem pendukung keputusan (SPK) dengan memamfaatkan metode analytical hierarchy process (AHP) sebagai proses dalam seleksi penerimaan siswa baru. Dalam proses seleksi ini digunakan beberapa kriteria untuk menentukan calon siswa baru yang mana yang akan diterima. SPK ini membantu sekolah dalam memutuskan siswa mana yang akan diterima. Penelitian skripsi ini lebih menitik beratkan kepada bagaimana merancang dan mengimplementasikan program serta dimaksudkan agar memudahkan dalam hal perhitungan. AHP digunakan sebagai metode dalam perhitungan dalam seleksi penerimaan siswa baru ini. Keyword : sistem pendukung keputusan, SDLC,AH
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
Uji Aktivitas Antibakteri Ekstrak Metanol Umbi Hati Tanah (Angiopteris evecta) Terhadap Bakteri Propionibacterium acnes Menggunakan Metode Sumuran: Antibacterial Activity Test of Extract Methanol Hati Umbi Tanah (Angiopteris evecta) Tubers Againt Propionibacterium acnes with CUP-PLATE TECHNIQUE Method
No full textHati Tanah adalah tanaman obat tradisional dari Palangkaraya, Kalimantan Tengah yang dipercaya masyarakat memiliki salah satu manfaat sebagai obat luka. Dari manfaat tanaman tersebut, pada penelitian ini mengangkat khasiat umbi hati tanah sebagai antibakteri pada kulit. Salah satu penyakit kulit yang sering terjadi yaitu jerawat. Tujuan penelitian ini untuk mengetahui kandungan senyawa fitokimia dan aktivitas antibakteri ekstrak metanol umbi hati tanah (Angiopteris evecta) terhadap bakteri Propionibacterium acnes. Metode ekstraksi yang digunakan adalah sokhletasi dengan pelarut metanol. Penelitian dilakukan dengan cara pengujian aktivitas antibakteri menggunakan metode sumuran dengan variasi konsentrasi 1%, 5%, 10%, 15%, kontrol positif doksisiklin 30 µg/disk dan kontrol negatif Na-CMC 0,5%. Hasil skrining fitokimia positif mengandung senyawa alkaloid, flavonoid, tanin, saponin dan fenol. Hasil uji aktivitas antibakteri menunjukkan bahwa konsentrasi 1% dan 5% memiliki zona hambat 2,38±0,41 mm dan 4,09±1,17 mm termasuk kategori lemah, sedangkan konsentrasi 10% dan 15% zona hambat 6,05±0,91 mm dan 8,61±0,70 mm termasuk kategori sedang. Ekstrak metanol umbi hati tanah (Angiopteris evecta) memiliki potensi sebagai antibakteri
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
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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