1,720,959 research outputs found
Preparasi dan Karakterisasi Membran Polisulfon dengan Pengisi Mikrobentonit sebagai Penyaring Air Gambut
No full textThis research aimed at investigating the effect of microbentonite augmentation for membrane to membrane flux in peat water filtration with inversion phase method. This research was carried out in five processing stages, namely preparation of microbentonite, make of polysulfone-microbentonite membrane toward the peat water and analysis of the peat water samples parameters including water turbidity, pH, TSS, and TDS. The composition of the membranes used were PSf 15%, DMAc and microbentonite 0%, 5%, 10%, 15% and 20%. The result showed that peat water before filtration with polysulfone–microbentonite membrane had not been suitable yet with the clear water qualification based on the PERMENKES RI NO.416/MENKES/PER/IX/1990. The result showed that PSf –B15% membrane had the best flux, that was 1,31 x 10-5 ml/cm2.s; turbidity 3,12 NTU; pH 6,8; TSS 52 mg/L; TDS 400 mg/L and suitable with PERMENKES RI NO.416/MENKES/PER/IX/1990. The characterization by using SEM showed that the polysulfone membrane after microbentonit augmentation had morphology changes in the membrane surface. The analysis of polysulfone membrane functional groups showed a sulfon group identified at wave number 1294,41 cm-1, wave number 1169, 5 cm-1 showed symmetric O=S=O of sulfonated group and 1150,45 cm-1 was symmetric groove O=S=O of sulfone group. The analysis of PSf 15% functional groups can identified that O=S=O appeared at wave number 1294 cm-1. At wave number 1013 cm-1 O-Si-O an absorption peak appeared and Al-O-Al absoption peak appeared at wave number 794 cm-1 that showed group consisted in the bentonite.Penelitian ini bertujuan mempelajari pengaruh penambahan mikrobentonit pada membran polisulfon terhadap nilai fluks (permeabilitas) membran pada penyaringan air gambut secara inversi fasa. Pada penelitian ini terdiri dari lima tahap pengerjaan, yaitu persiapan mikrobentonit, pembuatan membran polisulfon dengan penambahan mikrobentonit, karakterisasi membran, uji permeabilitas membran polisulfon-mikrobentonit terhadap air gambut serta analisis parameter sampel air gambut yang meliputi kekeruhan, pH, TSS dan TDS. Komposisi membran yang digunakan yaitu PSf 15% (w/w), dimetil asetamida (DMAc) dan mikrobentonit 0% ; 5% ; 10% ; 15% ; 20% (w/w). Air gambut sebelum penyaringan dengan membran polisulfon-mikrobentonit masih belum sesuai dengan standar persyaratan air bersih berdasarkan PERMENKES RI No.416/MENKES/PER/IX/1990. Hasil penelitian menunjukkan bahwa membran PSf 15% mempunyai nilai fluks paling baik yaitu 1,31 x 10-5 ml/cm2.s; kekeruhan 3,12 NTU; pH 6.8; TSS 52 mg/L; TDS 400 mg/L dan telah memenuhi standar air bersih berdasarkan PERMENKES RI No.416/MENKES/PER/IX/1990. Karakterisasi dengan SEM menunjukkan bahwa membran polisulfon setelah penambahan mikrobentonit 15% (PSf-B15%) terjadi perubahan morfologi di permukaan membran. Analisa gugus fungsi membran polisulfon (PSf) menunjukkan adanya gugus sulfon teridentifikasi pada bilangan gelombang 1294,41 cm-1, bilangan gelombang 1169,5 cm-1 menunjukkan ulur asimetrik O=S=O dari gugus tersulfonasi dan 1150,45 cm-1 merupakan ulur asimetrik O=S=O dari gugus sulfon. Analisa gugus fungsi PSf-15% dapat diidentifikasi bahwa O=S=O muncul pada bilangan gelombang 1294 cm-1. Pada bilangan gelombang 1013 cm-1 muncul puncak serapan O-Si-O dan 794 cm-1 puncak serapan Al-O-Al yang menunjukkan adanya gugus yang terkandung di dalam bentonit.104 Halama
PENENTUAN JENIS MEDIA TERHADAP EFEKTIVITAS PERTUMBUHAN JAMUR TRICHODERMA HARZIANUM
Full text linkThis study aims to determine a suitable medium for the growth Trichoderma harzianum. The treatments tested were rice media (M1), bran media (M2), corn media (M3), potato media (M4), and rice husk mixed media (M5). The parameters observed in this study were the quality test of conidia density using a microscope and haemacytometer, macroscopic observation of the media for 7 days and microscopic observation of the media to evaluate the media that had the best effectiveness as a medium for propagation of Trichoderma harzianum. The initial isolate of Trichoderma harzianum used had a conidia density of 2,9x109conidia/ml. The results showed that the propagation of Trichoderma harzianum in various media affected the macroscopic, microscopic and conidia density changes of Trichoderma harzianum. Trichoderma harzianum can grow on all treatment media. The bran media is the medium with the highest conidia density compared to other media
PENENTUAN DISOLUSI PADA OBAT SENYAWA KETOPROFEN SECARA SPEKTROFOTOMETRI
Full text linkResearch on dissolution determination of Ketoprofen compounds by Spectrophotometry. Ketoprofen is a non-steroidal anti-inflammatory drug compound (NSAID) that works as an anti-inflammatory. Anti-inflammatory here is a group of drugs used to reduce inflammation and relieve pain. The dissolution test is a method used to determine the content of active compounds that dissolve in drugs, where the time, temperature and media are set according to the human stomach and intestines, and can find out how much the content of active compounds dissolves in the human intestines and stomach. This dissolution test, then the ketoprofen drug is read by spectrophotometry. Test the dissolution by spectrophotometer at a wavelength of 260 nm using HCl 0.1 N and buffer pH 7.4. The results of the determination of the dissolution test of the active substance on ketoprofen at the acid stage obtained an average of 0.009% and at the pH 7.4 buffer stage obtained an average content of 86.4155%. It can be concluded that the determination of the ketoprofen dissolution test in the sample meets the requirements (MS), in accordance with the specifications of the Internal Standard of PT Novell Pharmaceutical Laboratories, namely at the acid stage not more than 10% of ketoprofen dissolved in 2 hours, and at the pH 7.4 buffer stage it has a requirement of 75%. ketoprofen dissolved in 45 minutes. In the dissolution of acidic media, 0.1 N HCl is used because its condition resembles that of the stomach
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
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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