1,720,954 research outputs found
STUDI KOMPREHENSIF PENGARUH DAN PENGOPTIMALAN DEAKTIVASI KATALIS TERHADAP PROSES PADA ALAT PRIMARY REFORMER (101-B) DI PABRIK AMONIA PUSRI-IV PT PUPUK SRIWIDJAJA PALEMBANG
Get PDF(Muhammad Rafli Firmansyah, 2021, 51 halaman, tabel, 11 gambar, 4 lampiran)
PT Pupuk Sriwidjaja Palembang merupakan salah satu industri yang
memanfaatkan amonia untuk memproduksi pupuk urea dan NPK. Untuk dapat
memproduksi amonia, dibutuhkan gas sintesa. Pengolahan gas alam menjadi gas
sintesa dengan menggunakan Primary Reformer, tidak pernah lepas dari sebuah
permasalahan. Diantara permasalahan tersebut, deaktivasi katalis merupakan
permasalahan yang pasti terjadi. Proses deaktivasi ini, dalam beberapa kasus,
dapat diperburuk dengan adanya endapan carbon deposit pada katalis. Hal ini
dapat menyebabkan penurunan kemampuan katalis tersebut untuk mengkonversi
gas alam, yang banyak mengandung metana, menjadi gas sintesa. Akibatnya,
terjadi methane slip. Penelitian ini bertujuan untuk meninjau pengaruh carbon
deposit terhadap methane slip dan bagaimana pengoptimalannya. Peninjauan
dilakukan dengan metode micro-kinetic analysis, dimana terlebih dulu
mempelajari mekanisme reaksi pada permukaan katalis, lalu mengevaluasi
kinetika reaksi secara umum dan reaksi pembentukan carbon deposit.
Berdasarkan ini, disimpulkan bahwa carbon deposit memperburuk proses
deaktivasi katalis dengan banyaknya sisi aktif katalis yang tertutup oleh carbon.
Namun, kondisi ini masih dapat diantisipasi dengan mengatur dan menjaga
kondisi operasi pada temperatur 777ºC dan tekanan antara 27 – 30,5 kg/cm2
SIMULASI PRODUKSI GAS SINTESA MELALUI PROSES BIOGAS STEAM REFORMING DENGAN KATALIS Ni/MgO-Al2O3 DAN Ni/La2O3-Al2O3
Get PDFA renewable energy system to produce electricity from biogas feed by integrating the reforming process with an SOFC (Solid Oxide Fuel Cell) was evaluated through experimental and modeling study. The system performance was evaluated using the Aspen Plus process simulation tool and through biogas steam reforming experiments over 10 wt% Ni/MgO-Al2O3 and Ni/La2O3-Al2O3. Biogas steam reforming simulations were conducted for biogas feeds with CH4/CO2 ratios of 40/60, 50/50 and 60/40 at S/C ratios of 1.00–2.00 over a temperature range of 873–1123 K. The experimental data conclude that positive CO2 conversion was attained at temperatures higher than 1073 K. The results show that the proposed system can provide a viable approach to maximizing renewable methane resources for localized power generatio
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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