1,720,956 research outputs found
SINTESIS MEMBRAN KITOSAN-SILIKA ABU SEKAM PADI UNTUK PENURUNAN LOGAM BERAT CU DENGAN PROSES ULTRAFILTRASI
Get PDFPada penelitian ini membran kitosan telah dibuat dengan metode inversi fasa dengan penambahan aditif silika abu sekam padi ke dalam larutan casting. Penelitian ini bertujuan untuk membuat dan mengevaluasi karakteristik membran kitosan-silika abu sekam padi untuk aplikasi pada penurunan logam berat Cu. Modifikasi membran kitosan diperlukan untuk menghasilkan membran dengan karakter yang lebih baik, misalnya meningkatkan kestabilan membran, memperkecil ukuran pori sehingga pemisahan molekul-molekul atau rejeksi makromolekul dari suatu larutan oleh membran lebih efektif. Konsentrasi membran kitosan-silika abu sekam padi divariasikan pada 20, 19, 17, dan 15 (% berat). Membran yang dihasilkan selanjutnya dikarakterisasi untuk parameter struktur morfologi dengan scanning electron microscopy (SEM), fourier transform infrared (FTIR). Fluks dan rejeksi larutan menggunakan modul filtrasi dead-end. Hasil uji SEM menunjukkan bahwa membran mempunyai pori dengan struktur asimetrik. Uji kinerja membran terhadap logam Cu mempunyai nilai rejeksi yaitu 38%, 39%, 46% dan 62% dengan perolehan fluks mencapai 0,4135 hingga 15,4377 L/jam.ba
PRARANCANGAN PABRIK PEKTIN DARL KULIT BUAH JERUK DENGAN KAPASITAS BAHAN BAKU 15.225 TON/TAHUN)
No full textPENINGKATAN PENGETAHUANSISWA/SISWI SMA NEGERI 5 KOTA LANGSAKECAMATANLANGSA BARODENGANPENYULUHANMANAJEMEN PENGELOLAAN SAMPAH YANG BAIK
Get PDFOne thing that is still a problem in Indonesia is the pile of garbage. there is still a lot of plastic waste produced by schools every day. The limited knowledge and skills of resources using appropriate technology is an obstacle for the school. Therefore, it is important to increase students' knowledge of good waste management. The targets for this community service activity are students of SMA Negeri 5 Langsa City through counseling. Due to the ongoing Covid-19 condition, this counseling was carried out only in 1 class while still adhering to health protocols. Based on the results of the discussion activities after the counseling, it was found that there was an understanding of students on how to manage waste properly and correctly.It is hoped that students will take an active role in increasing knowledge about waste management, especially in the school environment through counseling so that later they can create better health degree
PEMANFAATAN LIMBAH KONVEKSI UNTUK MENINGKATKAN PENDAPATAN RUMAH TANGGA DI DESA TIMBANG LANGSA KECAMATAN LANGSA BARO
Get PDFSolid waste is defined as anything that is not used and is in solid or semi-solid form. In connection with the previous discussion, it is necessary to know the theory of household income or income. This community service activity has the aim of empowering the residents of Timbang Langsa Village, Langsa Baro District so that they can play an active role in overcoming inorganic waste in the form of patchwork. This activity also helps increase household income in Timbang Langsa Village, Langsa Baro District. This goal is realized by providing skills to villagers to use patchwork into corsages/brooches that are suitable for sale. This activity was carried out with the background of wanting to empower community members in Timbang Langsa Village, Langsa Baro District so that they can play an active role in overcoming inorganic waste, in this case patchwork, by recycling. This activity also helps increase household income in Timbang Langsa Village, Langsa Baro District. This goal is realized by providing skills to villagers to use patchwork into corsages/brooches that are suitable for sale
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
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