1,720,963 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
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
Pengaruh Mutagen Etil Metan Sulfonat terhadap Kapasitas Regenerasi Tunas Hibrida Phalaenopsis In Vitro
Full text linkPerakitan kultivar yang tahan terhadap penyakit busuk lunak yang disebabkan Erwinia carotovora dapat dilakukan dengan teknik induksi mutasi. Tujuan penelitian ialah mengetahui pengaruh mutagen etil metan sulfonat (EMS) terhadap perubahan genetik di antaranya kapasitas regenerasi tanaman anggrek Phalaenopsis pada kultur in vitro dan mengetahui lethal concentration (LC) mutagen EMS pada anggrek hibrida Phalaenopsis. Percobaan ditata dalam rancangan acak lengkap dengan sembilan perlakuan konsentrasi EMS dan diulang tiga kali. Mutagen kimia yang digunakan yaitu EMS dengan konsentrasi 0 ; 0,025 ; 0,050 ; 0,075 ; 0,1; 0,125 ; 0,15 ; 0,175; dan 0,2%. Eksplan berupa meristem aksilar anggrek hibrida Phalaenopsis ditanam pada medium dasar MS+ 2 ml/l BA + 1 ml/l NAA dan diinkubasi pada ruang kultur. Hasil penelitian menunjukkan bahwa etil metan sulfonat memberi pengaruh pada pertumbuhan meristem hibrida Phalaenopsis dalam membentuk tunas. EMS dengan konsentrasi 0,025 dan 0,05% memberi pengaruh yang lebih baik terhadap jumlah tunas dan tinggi tunas. LC50 untuk karakter persentase pembentukan tunas ialah 0,112%. Terdapat dua konsentrasi EMS, yaitu 0,025 dan 0,05% yang memberi pengaruh terbaik pada pembentukan tunas hibrida Phalaenopsis. Diperoleh beberapa regeneran mutan potensial dari berbagai perlakukan < 0,15% EMS yang perlu diuji dengan isolat Erwinia carotovora. To improve cultivars resistance to soft rot disease caused by Erwinia carotovora can be done by using mutation induction. The research objective was to determine the effect of EMS mutagent Phalaenopsis hybrid to change the genetic i.e. capacity of plant regeneration in vitro culture and the lethal concentration (LC) of EMS mutagent in Phalaenopsis hybrid. The experiment was arranged in a completely randomized design with nine concentrations of EMS treatment and repeated three times. The mutagent of EMS concentrations used were 0, 0.025; 0.050; 0.075; 0.1; 0.125; 0.15; 0.175; and 0.2%. The meristem axilar as explant was be grown on basic medium MS suplemented with 2 ml/l BA + 1 ml/l NAA and incubated in culture room. The results showed that the influence on growth of EMS meristem Phalaenopsis hybrids. The EMS mutagent with concentration of 0.025 and 0.05% gave better effect to the high number of shoots and buds. LC50 of the percentage of bud formation character was 0.112%. Two EMS concentrations were 0.025 and 0.05% provided the best influence on the formation of shoot Phalaenopsis hybrid. There were many regenerants potential mutant from several EMS treatments < 0.15 % that should be tested by isolate of E. carotovora
Respons fisiologi pertumbuhan dan hasil tiga genotip jawawut terhadap cekaman kekeringan
Full text linkJawawut merupakan salah satu tanaman pangan lokal Indonesia yang belum banyak dikembangkan dan dimanfaatkan sebagai sumber pangan. Penelitian ini bertujuan untuk mendapatkan genotip jawawut yang memberikan pengaruh paling baik terhadap pertumbuhan dan hasil pada berbagai tingkat pemberian air di rumah plastik. Penelitian dilaksanakan pada bulan Juni sampai dengan September 2017 di Kebun Percobaan Fakultas Pertanian, Universitas Padjadjaran. Penelitian menggunakan Rancangan Petak Terbagi (Split Plot Design) dengan 3 ulangan. Petak utama terdiri dari tiga macam genotip yaitu genotip 44, 46, dan 48. Anak petak terdiri dari tiga taraf kapasitas lapang yaitu 75%, 50% dan 25%. Hasil penelitian menunjukkan perlakuan pemberian air 25% kapasitas lapang berpengaruh paling buruk terhadap proses fisiologis pertumbuhan dan hasil tiga genotip jawawut. Genotip 44 dan 46, pada pemberian air 50 % KL menghasilkan konduktan stomata terbaik. Genotip 46 dan 48 memberikan pengaruh paling baik terhadap proses fisiologis pertumbuhan dan hasil jawawut yaitu jumlah anakan per rumpun.ABSTRACTMillet is one of Indonesia\u27s local food crops that has not been widely developed as food sources. The purpose of this study was to obtain the genotypes of millet which gave the best effect on the growth and yield at various levels of water supply in the plastic house. The study was conducted from June to September 2017 at the Experimental Station of the Faculty of Agriculture, Universitas Padjadjaran. The research used the Split Plot Design with three replications. The main plot factor consisted of three levels of treatment; genotypes 44, 46, and 48. The subplot factor consisted of three stages of different treatment of the field capacity; 75%, 50% and 25%. The results showed the treatment of 25% water to field capacity had the worst effect on the physiological process of growth and yield of three millet genotypes. Genotypes 44 and 46, at 50% field capacity, produced the best stomatal conductance. Genotype 46 and 48 showed the best response to the physiological processes for the number of tillers
QUANTITATIVE ANALYSIS OF Α-MANGOSTIN IN MANGOSTEEN (GARCINIA MANGOSTANA L.) PERICARP EXTRACT FROM FOUR DISTRICT OF WEST JAVA BY HPLC METHOD
Full text linkObjective: The objective of this study was to determine the validity of analytical methods of α-mangostin using HPLC with UV detector and acidic methanol as mobile phase. Then, compare the level of α-mangostin and quality of mangosteen pericarp from four regions in West Java.Methods: The determination was performed by HPLC with C-18 (octadecylsilane) as a column with methanol and 1% acetic acid in water (95:5) as mobile phase and a flow rate of 1 ml/min. UV detector was adjusted at 246 nmResults: The calibration curves for the α-mangostin were linear over concentrations range from 5 to 200 µg/ml with a correlation coefficient (r) 0.9999. The coefï¬cient of variation obtained from α-mangostin was less than 2 %. LOD and LOQ of α-mangostin were 2.122 and 7.072 μg/ml, respectively. The levels of α-mangostin from four regions were 12.39 % for Subang, 8.30 % for Purwakarta, 6.34 % for Bogor and 5.70 % for Tasikmalaya.Conclusion: The modified HPLC method meets the validation criteria. The highest a-mangostin level and the best pericarp quality was mangosteen from Subang
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