1,720,958 research outputs found
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
ANALISIS BALIK KUAT GESER TANAH TERSTABILISASI SEMEN DENGAN METODE NUMERIK
Full text linkShear strenght is a parameter to soils strenght analysis. Shear strenght can be obtained from laboratorium test that interpreted as stress and strain. Soil tests had done on soil stabilization of cement with mixing 5%; 10%; 15% of content. Soil tests were used by triaxial test of unconsolidated undrained (triaxial UU) with cell pressure at 50; 100; 200 kN/m2 and unconfined compression test. The test specimens were disturbed soil samples which compacted and remolded, and then carry out curing for 0; 3; 7; 14; 28 days. The laboratory test results were back analysis in Plaxis 2D by using Mohr-Coulumb and Hardening Soil model later. The Mohr-Coulumb and Hardening Soil model had deviator stress results was almost equal to the test results of triaxial UU and unconfined compression test. Especially of strain by Mohr-Coulumb model, shew the lower strain than be showed by triaxial UU test and unconfined compression test. The Hardening Soil model, provides fluctuating strain results of triaxial UU test because it is affected by the application of cell pressure (σ3) and it provides greater strain results from unconfined compression test.
Keywords: Triaxial UU, Unconfined Compresssion, Stress and Strain, Plaxis 2DKuat geser tanah merupakan suatu parameter penting didalam analisis kekuatan tanah. Kuat geser diperoleh dari uji laboratorium yang diinterpretasikan sebagai tegangan regangan. Pengujian dilakukan pada tanah terstabilisasi semen dengan kadar semen 5%; 10%; 15%. Pengujian dilakukan dengan alat uji triaksial takterkonsolidasi takterdrainase (triaksial UU) pada tekanan sel 50; 100; 200 kN/m2 dan uji tekan bebas. Benda uji merupakan contoh tanah terganggu yang dipadatkan dan dibentuk kembali, lalu dilakukan pemeraman selama 0; 3; 7; 14; 28 hari. Tegangan regangan hasil pengujian laboratorium kemudian dianalisis balik dengan metode numerik pada program Plaxis 2D yang menggunakan model Mohr-Coulumb dan Hardening Soil. Analisis menunjukkan model Hardening Soil dan Mohr-Coulumb memberikan hasil tegangan puncak yang mendekati sama dengan hasil pengujian triaksial UU dan tekan bebas. Khusus untuk regangan dengan model Mohr-Coulumb, memberikan hasil regangan yang lebih kecil dari pengujian triaksial UU dan tekan bebas. Dengan model Hardening Soil, memberikan hasil regangan yang fluktuatif dari pengujian triaksial UU karena dipengaruhi oleh penerapan tekanan sel (σ3) dan memberikan hasil regangan yang lebih besar dari pengujian tekan bebas.
Kata Kunci: Triaksial UU, Tekan bebas, Tegangan dan Regangan, Plaxis 2
EVALUASI PENGARUH PALM OIL FUEL ASH (POFA) BERBASIS ALKALI-ACTIVATED MATERIAL UNTUK STABILISASI TANAH SEBAGAI LAPISAN SUBGRADE
Full text linkPerkuatan tanah dengan cara stabilisasi merupakan prosedur yang dipilih untuk memperbaiki sifat-sifat buruk pada tanah. Bahan semen dan kapur sering digunakan untuk bahan tambah yang dikenal sebagai metode stabilisasi tradisional dan memiliki masalah lingkungan. Inovasi penggunaan bahan tambah lain perlu dikembangkan agar dapat digunakan sebagai alternatif bahan stabilisasi yang ramah lingkungan dan modern. Tujuan penelitian ini untuk mengevaluasi kelayakan POFA teraktivasi alkali aktivator (AAP) sebagai bahan stabilisasi tanah untuk lapisan subgrade.
Bahan-bahan yang digunakan adalah tanah asli untuk timbunan jalan dengan nilai CBR kurang dari 6%, POFA, Sodium silika (Na2SiO3) dan Sodium hidroksida (NaOH). Desain campuran dibuat dengan menambahkan sebanyak 20% POFA dan alkali aktivator dari pelarutan NaOH 10M dan Na2SiO3 pada rasio (Si/Al) 1.0; 1.5; 2.0; 2.5. Pengujian laboratorium terdiri dari uji properties, pemadatan standar, kuat tekan bebas, CBR dan beban pelat. Pengujian beban pelat dilaksanakan dengan membuat model fisik lapisan subgrade diatas tanah penopang. Validasi hasil uji beban pelat menggunakan analisis numerik dengan metode elemen hingga (FEM). Pemeriksaan kandungan mineral dan mikrostruktur dengan alat X-RF, X-RD dan SEM-EDS.
Berdasarkan metode USCS bahwa tanah asli masuk klasifikasi SP-SC (pasir berlempung bergradasi buruk) dan metode AASHTO dalam klasifikasi A-2-6 (pasir berlempung). Indeks plastisitas (PI) tanah asli menurun dari sedang 11.20% menjadi rendah 3.63% setelah ditambah 20% POFA. Kuat tekan bebas maksimal diperoleh dari campuran alkali aktivator pada rasio 2.5 sebesar 6.84 MPa. Stabilisasi tanah asli pada campuran AAP 2.5 memperoleh peningkatan kekuatan mencapai 10 kali lebih besar dari tanah asli yaitu dari CBR 3.95% menjadi 39.0% dengan kriteria sangat baik dan memenuhi persyaratan teknis CBR 12% minimum. Berdasarkan uji beban pelat, diperoleh kuat dukung ultimit lapisan subgrade sebesar 30 kN dengan penurunan 24.75 mm dan validasi FEM menunjukkan penurunan lebih rendah yaitu 21.91 mm. Pemeriksaan mikrostruktur menunjukkan sintetis aluminosilikat dalam campuran tanah asli terstabilisasi AAP 2.5 berupa ikatan calcium-silicate-hydrate (C-S-H) gel. Dari tinjauan kelayakan teknis, kuat tekan tanah asli terstabilisasi AAP 2.5 setara dengan campuran 10% semen antara 1.81–1.82 MPa. Namun dari tinjauan kelayakan ekonomi memperoleh biaya pembelian bahan sebesar Rp. 82.471,- yang lebih mahal dibandingkan campuran 10% semen sebesar Rp. 19.271,-. Evaluasi kinerja POFA dan alkali aktivator untuk stabilisasi tanah asli sebagai lapisan subgrade memperoleh desain campuran efektif pada variasi AAP 2.5 dan menjadi kebaruan dari penelitian ini. Bahan stabilisasi AAP 2.5 memiliki kinerja mekanis yang telah memenuhi persyaratan teknis, tetapi belum mencapai kelayakan nilai ekonomis
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
- …
