1,720,973 research outputs found
Weed suppression by organic and synthetic mulches in cultivated peppermint (Mentha x piperita L.)
Full text linkMogućnosti suzbijanja korova malčiranjem ispitivane su u zasadu pitome nane gajene na proizvodnim površinama Instituta za proučavanje lekovitog bilja “Dr. Josif Pančić” u Pančevu (44°52'20.0"N, 20°42'04.7"E, 81 m n.v.), Južni Banat. U našim agroekološkim uslovima pitoma nana se gaji kao jednogodišnja vrsta i obično daje dve žetve. Obzirom da ne postoji lista dozvoljenih herbicida u lekovitom bilju, glavni izazov u njenom gajenju predstavlja suzbijanje korova.
U preliminarna istraživanja uključeno je 14 malčeva (5 sintetičkih i 9 prirodih). Po dva malča iz svake grupe (sintetički: PE sivo-crna i agrotekstilna crna folija; prirodni: piljevina bagrema i iglice crnog bora) koja su se u preliminarnim ogledima pokazala kao najpogodnija za suzbijanje korova u pitomoj nani, uključena su u detaljna ispitivanja u narednim dvogodišnjim ogledima. Eksperimentalni zasadi su zasnivani sadnjom stolona (1.500 kg ha-1) u jesen, na međurednom razmaku od 0,7 m. Sintetički malčevi su postavljani duž redova (širina 0,7 m, na svakih 10 cm reda otvori Ø 10 cm), a prirodni u međuredu (sloj 5-10 cm, širine 0,5 m). Efekasnost malčeva u suzbijanju korova procenjena je na osnovu poređenja sa zakorovljenom kontrolom, a njihov efekat na prinos sa nezakorovljenom kontrolom. Detaljno je analiziran i efekat malčeva na kvalitet prinosa a u te svrhe je utvrđen udeo lista sa cvetom i stabla, sadržaj i hemijski kvalitet etarskog ulja, relativni sadržaj hlorofila u listu i prinos stolona. Utvrđen je i uticaj malčeva na temperatutu i pH reakciju površinskog sloja zemljišta.
Potpuno suzbijanje korova i najveći prinos ostvareni su pri primeni folija dok je efikasnost prirodnih malčeva bila znatno niža (u zavisnosti od ocene, od 28,9 - 81,8%). Prinosi ostvareni u 2017. su bili niži (usled nepovoljnih meteoroloških prilika) od prinosa u 2016., kada je ukupan prinos (u obe žetve) na agrotekstilnoj crnoj foliji bio 5,6 t ha-1, a na sivo-crnoj foliji 4,7 t ha-1. Ipak, kada se uzme u obzir većina ispitivanih parametara (udeo lista sa cvetom i stabla, sadržaj etarskog ulja i prinos stolona) najpovoljniji efekt u zasadu pitome nane ispoljila je sivo-crna folija.Weed control by mulching in the peppermint plantation was conducted on the experimental fields of the Institute for Medicinal Plant Research "Dr Josif Pančić", in the South Banat, Serbia (44°52'20.0"N, 20°42'04.7"E, 81 m above sea level). In our agro-ecological conditions, peppermint is grown as an annual species with two harvests. In its cultivation the main problem is a weed control, as no or limited use of herbicides is advised in medicinal plants.
Preliminary research included 14 mulches (5 synthetic and 9 organic). Two mulches from each group (synthetic: PE silver-black and agrotextile black foil; organic: acacia sawdust and black pine needles), which proved to be the most suitable for weed control in peppermint, were included in further two-year experiment. Experimental plantings were established in autumn, with stolons (1500 kg ha-1) at a row spacing of 0.7 m. Synthetic mulches were placed along the rows (width 0.7 m, openings Ø 10 cm at every 10 cm of the row), while organic mulches were spread between the rows (layer 5-10 cm, width 0.5 m). The efficacy of mulch on weed suppression was compared with control with weeds, while the efficacy on yield was compared with non-weed control. The quality of yield was examined in detail and the ratio of leaves with flowers to stem, the content and chemical conposition of essential oil, the relative content of chlorophyll in the leaf, as well as the yield of stolons were determined with regard to it. The influence of mulch on the soil temperature and soil reaction (pH) in the surface layer was also determined.
Total weed suppression was obtained with the use of synthetic mulches, where the highest yield of absolutely dry biomass of the aboveground part of peppermint were recorded both experimental years, while the efficacy of organic mulches ranged from 28,9 to 81,8%. Yields achieved in 2017 were lower (due to climatic conditions) compared to that in 2016; the yield in the treatment with agrotextile black mulch was 5.6 t ha-1, while the one achieved with the silver-black mulch was 4.7 t ha-1. Under the silver-black mulch, the peppermint plants generally achieved better ratio of leaves with flowers to stem, higher content of essential oil and higher yield of stolons, compared to those under the organic mulches
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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