1,720,956 research outputs found
Pemanfaatan Limbah Bottom Ash Pltu Timor-1 Sebagai Bahan Pengganti Agregat Halus Dalam Pembuatan Beton
Full text linkBottom ash merupakan residu padat hasil pembakaran batubara pada Pembangkit Listrik Tenaga Uap (PLTU) yang mengendap di bagian dasar boiler pembakaran. Meskipun sering dikategorikan sebagai limbah B3 (bahan berbahaya dan beracun), bottom ash memiliki potensi untuk dimanfaatkan kembali, terutama dalam bidang konstruki sebagai bahan campuran beton. Pengelolahan bottom ash penting dilakukan untuk mencegah pencemaran lingkungan dan mendukung penerapan prinsip ekonomi sirkular melalui pemanfaatan limbah menjadi material bernilai guna. PLTU Timor1 merupakan salah satu dari 2 PLTU yang ada di Kupang Nusa Tenggara Timur yang dibangun pada tahun 2018 dan baru beroperasi pada tahun 2021. Dengan mulainya beropeasi PLTU Timor 1 tersebut diarasakan perlu untuk dilakukan pebelitian ini agar limbah sisa hasil produksi PLTU dapat dimanfaatkan dengan baik. Penelitian ini bertujuan untuk melakukan pemeriksaan bagaimana pengaruh bottom ash sebagai bahan pengganti pasir dalam beton normal yang diukur dengan nilai slump dan mutu kuat tekan beton. Percobaan dilakukan dengan melakukan penggantian secara parsial pasir dengan bottom ash sebesar 0%,10%, 20%, 30% dan 40%. Hasil pengujian diperoleh nilai slump untuk variasi 0%, 10%, 20%, 30%, dan 40% didapatkan masing-masing 11,03 cm; 10,60 cm; 10,27; 9,7 cm; dan 9,33 cm. Hasil ini menunjukan bahwa semakin tinggi persentasi bottom ash dalam menghasilkan beton workability semakin rendah. Hasil pengujian kuat tekan untuk variasi 0%, 10%, 20%, 30%, dan 40% diperoleh untuk masing-masing 11,54 MPa; 11,78 Mpa, 12,56 Mpa, 16,88 Mpa, dan 19,36 Mpa. Hasil ini menunjukan bahwa semakin tinggi persentase bottom ash sebagai bahan pengganti pasir dalam beton mutu kuat tekan beton yang dihasilkan semakin tinggi
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
Performance of a Cold Formed Steel Pedestrian Bridge under Static and Dynamic Loads
No full textThis paper summarizes new application of CFS in bridge constructions where a seven meters long pedestrian bridge was constructed. The bridge has 1.2m width, 0.8m depth, and is composed of CFS Warren truss and bondek floor systems. Natural frequency of the bridge considering only dead load application was found as 8.54 Hz and decreased to 7.08 Hz when the live load was included. Under static load test, the application of dead load only and both dead and live loads yielded a maximum deflection of 3.53 and 8.1 mm, respectively. Normal walking and running pedestrian loads were carried out created a maximum acceleration equaled to 0.11g. Lastly, sinusoidal waves application facilitated through a three-phase induction motor having self-weight of 24.86 kgf at frequency equal to 8.5 Hz was performed for one hour resulting no decrease of the natural frequency, thus the bridge can be assumed to experience no noticeable stiffness degradation
Performance of a Cold Formed Steel Pedestrian Bridge under Static and Dynamic Loads
No full textThis paper summarizes new application of CFS in bridge constructions where a seven meters long pedestrian bridge was constructed. The bridge has 1.2m width, 0.8m depth, and is composed of CFS Warren truss and bondek floor systems. Natural frequency of the bridge considering only dead load application was found as 8.54 Hz and decreased to 7.08 Hz when the live load was included. Under static load test, the application of dead load only and both dead and live loads yielded a maximum deflection of 3.53 and 8.1 mm, respectively. Normal walking and running pedestrian loads were carried out created a maximum acceleration equaled to 0.11g. Lastly, sinusoidal waves application facilitated through a three-phase induction motor having self-weight of 24.86 kgf at frequency equal to 8.5 Hz was performed for one hour resulting no decrease of the natural frequency, thus the bridge can be assumed to experience no noticeable stiffness degradation
Performance of a Cold Formed Steel Pedestrian Bridge under Static and Dynamic Loads
Full text linkThis paper summarizes new application of CFS in bridge constructions where a seven meters long pedestrian bridge was constructed. The bridge has 1.2m width, 0.8m depth, and is composed of CFS Warren truss and bondek floor systems. Natural frequency of the bridge considering only dead load application was found as 8.54 Hz and decreased to 7.08 Hz when the live load was included. Under static load test, the application of dead load only and both dead and live loads yielded a maximum deflection of 3.53 and 8.1 mm, respectively. Normal walking and running pedestrian loads were carried out created a maximum acceleration equaled to 0.11g. Lastly, sinusoidal waves application facilitated through a three-phase induction motor having self-weight of 24.86 kgf at frequency equal to 8.5 Hz was performed for one hour resulting no decrease of the natural frequency, thus the bridge can be assumed to experience no noticeable stiffness degradation
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
- …
