1,720,955 research outputs found
PENGARUH SUBSTITUSI PARSIAL AGREGAT DAN ADITIF TERHADAP SIFAT MEKANIS BETON MUTU TINGGI (PENGGUNAAN LIMBAH CANGKANG SAWIT DAN PASIR POZZOLAN ALAMI)
No full textPerkembangan dari teknologi beton saat ini mutlak diperlukan, ini terkait dari banyaknya permintaan bangunan dengan massa yang besar dan berlantai banyak. Salah satunya adalah perkembangan dibidang beton bermutu tinggi. Material penyusun beton yang terdiri dari semen, split, pasir, air dan zat additive dengan kualitas yang baik mutlak diperlukan pada pembuatan beton bermutu tinggi. Berbicara tentang split dan pasir, kita pasti mengetahui dampak yang ditimbulkan bagi daerah aliran sungai atas penambangan yang dilakukan. Untuk itu diperlukan penelitian tentang pemakaian material alternatif untuk menggantikan posisi pasir dan split pada pembuatan beton bermutu tinggi. Pasir pozzolan alami dan kerak hasil pembakaran cangkang sawit dapat dipakai untuk menggantikan pasir dan split. Penggunaan pasir pozzolan alami dan kerak dari hasil pembakaran cangkang sawit pada pembuatan beton bermutu tinggi diharapkan dapat menghasilkan beton bermutu tinggi yang berkualitas dan murah. Tujuan penelitian yaitu menganalisis pengaruh penggunaan limbah hasil pembakaran cangkang sawit dan pasir pozzolan alami sebagai pengganti agregat serta penggunaan abu pasir pozzolan sebagai aditif pengganti semen. Pada penelitian ini persentase pemakaian agregat alternatif sebanyak 10%, 20%, 30%, 40% dan 50% dari total agregat yang dibutuhkan. Untuk pemakaian abu pasir pozzolan sebagai aditif pengganti semen sebanyak 5%, 10% dan 15% dari total semen yang dipakai. Campuran beton direncanakan untuk menahan beban tekanan sebesar 70 MPa dengan total pemakaian semen sebanyak 600 kg/m3. Superplasticizer yang dipakai adalah viscocrete 10. Dari hasil kajian eksperimental pemakaian bongkahan cangkang sawit dan pasir pozzolan sebagai substitusi serta pemakaian abu pozzolan sebagai aditif dapat meningkatkan nilai kuat tekan. Persentase optimum pemakaian bongkahan cangkang sawit sebagai substitusi agregat kasar dan pasir pozzolan sebagai substitusi agregat halus adalah sebesar 10%, sedangkan untuk persentase optimum pemakaian abu pozzolan sebagai additif adalah sebesar 10%.Kata Kunci : Beton, Bongkah Cangkang Sawit, Pecahan Cangkang Sawit, Pasir Pozzolan, Abu Pasir Pozzolan, Superplasticizer
Pengaruh substitusi parsial agregat dan aditif terhadap sifat mekanis beton mutu tinggi (Penggunaan limbah cangkang sawi dan pasir pozzolan alami
No full textxiii.;257 hlm.;ilus.; tab.; 29 cm
Peningkatan Daya Dukung Timbunan Tanah Lempung Menggunakan Serat Karung Plastik Dan Arang Kayu
No full textTanah lempung merupakan salah satu jenis material tanah yang ada di dunia. Tanah ini juga memiliki karakteristik mudah mengembang apabila diberi air dan menyusut apabila kekurangan air. Tidak semua tanah mempunyai sifat dan daya dukung tanah yang baik. Di Kota Langsa mempunyai tanah yang bersifat tanah lempung contohnya di desa kemuning. Untuk mengurangi bertambahnya volume sampah, ini perlu dipikirkan suatu cara bagaimana pengolahan sampah plastik, dengan cara pemanfaatan karung plastik sebagai perkuatan tanah. Abu arang kayu dapat memperbaiki sirkulasi air dan udara, serta dapat mengikat karbon, dan juga dapat mengurangi kembang susut pada tanah, karena mempunyai sifat mereduksi indeks plastisitas tanah. Penelitian ini bertujuan untuk mendapatkan seberapa besar pengaruh penambahan serat karung plastik dan arang kayu pada timbunan tanah lempung terhadap nilai keruntuhan kuat geser tanah dengan pengujian Triaxial UU, maka dari hasil penelitian tersebut berdasarkan klasifikasi tanah pada Tanah lempung persen lolos saringan No.200 sebesar 31,86% dengan nilai kadar air sebesar 2,65%, Presentase campuran terbaik terdapat pada variasi SKP 3% dan AK 10%, yang memiliki sifat fisik meliputi batas cair (LL) sebesar 41,46%, batas plastis (PL) sebesar 22.92% dan indeks plastisitas (PI) sebesar 17,92%. Dalam penelitian ini menggunakan metode USCS (Unified Soil Classification System)
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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