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
Kolonisasi Fungi Mikoriza Arbuskular (FMA) pada Rizosfer Beberapa Vegetasi di Lahan Pasca Tambang Batu Bara dengan Tingkat Kelerengan Berbeda
Full text linkKegiatan pertambangan khususnya batu bara berpotensi memberikan dampak negatif bagi lingkungan karena menyebabkan kerusakan lahan. Adapun guna merehabilitasi lahan tersebut diperlukan suatu tindakan revegetasi, antara lain menggunakan bantuan Fungi Mikoriza Arbuskular (FMA). Penelitian ini bertujuan untuk mengetahui persentase kolonisasi spora FMA yang mengindikasikan tingkat kecocokan antara FMA dengan vegetasi eksisting di lahan pasca tambang batu bara pada beberapa kelerengan yang berbeda, sehingga diharapkan dapat diperoleh suatu informasi awal dalam menentukan jenis tanaman yang cocok untuk dikombinasikan dengan spora FMA yang mendukung langkah revegetasi tersebut. Tahapan kajian yang dilakukan ialah mengambil sampel tanah lahan bekas tambang batu bara, identifikasi vegetasi, ekstraksi spora, dan identifikasi spora FMA yang ditemukan. Pengambilan sampel tanah untuk analisis sifat kimia tanah serta pengamatan spora mikoriza pada lahan bekas tambang batu bara dilakukan berdasarkan random sampling pada kedalaman 0-20 cm dengan 5 tipe kelerengan, yaitu datar, landai, agak curam, curam, dan sangat curam. Hasil penelitian menunjukkan bahwa kolonisasi mikoriza di dalam tanah lahan pasca tambang batu bara memiliki nilai persentase yang berbeda pada masing-masing tipe kelerengan, yaitu mencapai 30% (datar), 21,58% (landai), 13,16% (agak curam), 23,34% (curam), dan 6,19% (sangat curam). Semakin curam lereng, kolonisasi akan semakin menurun. Berdasarkan frekuensinya, Glomus sp. dapat ditemukan pada setiap tipe kelerengan, sehingga mengindikasikan bahwa jenis FMA tersebut mampu bersimbiosis dengan baik dengan tumbuhan yang ditemukan antara lain seperti Centrosema pubescens, Fimbristylis littoralis, Vigna luteola, Alysicarpus vaginalis, dan Mimosa sp. Persentase kolonisasi akar berkorelasi negatif dengan kadar P dan berkorelasi positif dengan kadar Ca dalam tanah. Persentase kolonisasi spora FMA tertinggi terjadi pada lereng datar dengan vegetasi Centrosema pubescens.
SH Tingkat Serangan Hama Kutu Hijau (Coccus viridis) Pada Tanaman Kopi di PT PTL Coffee Bean di Kabupaten Solok Selatan
No full text[[INFESTATION LEVEL OF GREEN SCALE INSECT (Coccus viridis) ON COFFEE PLANTS AT PT PTL COFFEE BEAN, SOLOK SELATAN REGENCY]. The green scale insect (Coccus viridis) is a major pest in coffee plantations in Indonesia. It is classified as an economically significant pest due to its potential to cause up to 50% plant damage, leading to substantial yield reduction and financial losses. This study aims to determine the infestation level of Coccus viridis at PT PTL Coffee Bean, Solok Selatan Regency, and to analyze the influence of environmental factors on infestation intensity. The findings of this study are expected to serve as a foundation for developing appropriate pest control strategies based on the principles of Integrated Pest Management (IPM). The research was conducted using a systematic sampling method with a diagonal line pattern across the coffee plantation owned by PT PTL Coffee Bean. Direct field observations were performed, and further analyses were conducted at the Integrated Pest Management Laboratory, Faculty of Agriculture, Andalas University. The results showed that the infestation intensity of Coccus viridis on coffee plants at the study site was 15.38%, which falls into the mild infestation category. The infestation level was influenced by environmental factors such as altitude, temperature, humidity, light intensity, and cultivation techniques. Although the infestation level was classified as mild, regular monitoring remains essential to prevent an increase in pest populations. Furthermore, IPM-based control strategies should be optimized to sustain coffee plant productivity, including the conservation of natural enemies and the application of proper cultivation techniques.Kutu hijau (Coccus viridis) merupakan salah satu hama penting pada perkebunan kopi di Indonesia. Dikategorikan sebagai hama penting karena hama ini sudah menyebabkan tingkat kerusakan yang cukup tinggi mencapai angka 50%, dan menimbulkan kerugian ekonomi yang cukup signifikan karena merusak bagian tanaman seperti daun dan buah. Kajian dasar dengan mengetahui tingkat serangan hama kutu hijau dapat memudahkan petani kopi dalam usaha praktik pengendaliannya. Untuk itu perlu dilakukan penelitian ini dengan tujuan jangka panjang dari penelitian ini adalah untuk menentukan praktik pengendalian yang tepat sesuai dengan komponen yang ada dalam Pengelolaan Hama Terpadu (PHT). Sedangkan target khususnya adalah untuk memberikan informasi tingkat serangan hama kutu hijau di PT. PTL Coffee Bean, Kabupaten Solok Selatan, dan mengetahui pengaruh faktor lingkungan terhadap intensitas serangan hama kutu hijau di PT. PTL Coffee Bean, Kabupaten Solok Selatan. Penentuan lokasi penelitian dilakukan secara acak sistematis dengan menarik garis diagonal pada lahan kopi milik PT PTL Coffee Bean. Hama kutu hijau diamati secara langsung pada tanaman sampel di lahan perkebunan kopi milik PT PTL Coffeee Bean Kabupaten Solok Selatan dan di Laboratorium Pengelolaan Hama Terpadu Fakultas Pertanian Universitas Andalas. Berdasarkan penelitian yang telah dilakukan maka dapat diambil kesimpulan bahwa intensitas serangan hama kutu hijau (Coccus viridis) pada tanaman kopi milik PT PTL Coffee Bean 15,38%. Intensitas serangan ini termasuk serangan dengan kategori serangan ringan. Hal ini terkait dengan ketinggian tempat, suhu, kelembapan dan intensitas cahaya di lokasi penelitian, serta teknik budidaya
IDENTIFY THE EFFECT OF ALTITUDE ON THE MORPHOLOGY OF SUGAR PALM PLANTS
Full text linkIndonesia needs to diversify cane sugar into brown sugar to reduce imports of cane sugar. Excessive consumption of cane sugar is one of the causes of the increase in diabetes mellitus sufferers. The sugar palm plant as a producer of brown sugar has the potential to be developed as a substitute for cane sugar. Identification of sugar palm plants is carried out to determine genetic diversity. High genetic diversity also has high adaptability. This research aims to determine differences in the morphological characteristics of sugar palm plants based on different altitudes and identify the level of uniformity of morphological characteristics in sugar palm plants. The results of these observations are used as initial data to determine the parent tree that will be used as propagation material. The research was conducted in North Lintau Buo District, Tanah Datar Regency, West Sumatra from September to October 2024. Sampling locations were taken based on different altitudes with three plant samples per altitude until nine plant accessions were obtained. The research results showed that the quantitative and qualitative characters of sugar palm plants had relatively narrow phenotypic variability values. The kinship analysis of sugar palm plants has a level of similarity with a coefficient value of 10.13 – 80.39%. The closest relationship distance is shown in accession 8 and accession 9, with a similarity level of 80.39%. Meanwhile, accession 4 has a distant relationship with accessions 1, 3, 2, 7, 8, 9, 6, and 5 with a similarity level of only 10.13%. PCA analysis shows that accession 4 is different from other accessions based on the characteristics of bark color, frond shape, petiole shape, and build leaflets.
Indonesia needs to diversify cane sugar into brown sugar to reduce imports of cane sugar. Excessive consumption of cane sugar is one of the causes of the increase in diabetes mellitus sufferers. The sugar palm plant as a producer of brown sugar has the potential to be developed as a substitute for cane sugar. Identification of sugar palm plants is carried out to determine genetic diversity. High genetic diversity also has high adaptability. This research aims to determine differences in the morphological characteristics of sugar palm plants based on different altitudes and identify the level of uniformity of morphological characteristics in sugar palm plants. The results of these observations are used as initial data to determine the parent tree that will be used as propagation material. The research was conducted in North Lintau Buo District, Tanah Datar Regency, West Sumatra from September to October 2024. Sampling locations were taken based on different altitudes with three plant samples per altitude until nine plant accessions were obtained. The research results showed that the quantitative and qualitative characters of sugar palm plants had relatively narrow phenotypic variability values. The kinship analysis of sugar palm plants has a level of similarity with a coefficient value of 10.13 – 80.39%. The closest relationship distance is shown in accession 8 and accession 9, with a similarity level of 80.39%. Meanwhile, accession 4 has a distant relationship with accessions 1, 3, 2, 7, 8, 9, 6, and 5 with a similarity level of only 10.13%. PCA analysis shows that accession 4 is different from other accessions based on the characteristics of bark color, frond shape, petiole shape, and build leaflets.
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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