1,722,274 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
Primary power sources Li/Cu₄Bi₅S₁₀
No full textИсследованы эксплуатационные характеристики электрохимической системы Li/Cu₄Bi₅S₁₀, определен механизм токообразования. Измерены импедансные спектры гальванической пары при различной глубине разрядки. Предложена модель эквивалентной электрической схемы.Представлено результати дослідження експлуатаційних характеристик електрохімічної системи Li/Cu₄Bi₅S₁₀. Визначено механізм струмоутворення. Вивчено і проаналізовано імпедансні спектри «2325»-елементів Li/Cu₄Bi₅S₁₀ при різній глибині розряду. Запропоновано модель еквівалентної електричної схеми, оцінено коефцієнти, що характеризують електродні реакції.·The results of investigation of the operating characteristics of the electrochemical system Li/Cu₄Bi₅S₁₀ are presented. The mechanism of the current forming reaction is established. The impedance spectra of Li/Cu₄Bi₅S₁₀ cells are investigated and analyzed at different depths of discharge. A model of the equivalent electrical circuit is proposed, and the coefficients describing the electrode reactions are estimated
Primary power sources Li/Cu₄Bi₅S₁₀
No full textИсследованы эксплуатационные характеристики электрохимической системы Li/Cu₄Bi₅S₁₀, определен механизм токообразования. Измерены импедансные спектры гальванической пары при различной глубине разрядки. Предложена модель эквивалентной электрической схемы.Представлено результати дослідження експлуатаційних характеристик електрохімічної системи Li/Cu₄Bi₅S₁₀. Визначено механізм струмоутворення. Вивчено і проаналізовано імпедансні спектри «2325»-елементів Li/Cu₄Bi₅S₁₀ при різній глибині розряду. Запропоновано модель еквівалентної електричної схеми, оцінено коефцієнти, що характеризують електродні реакції.·The results of investigation of the operating characteristics of the electrochemical system Li/Cu₄Bi₅S₁₀ are presented. The mechanism of the current forming reaction is established. The impedance spectra of Li/Cu₄Bi₅S₁₀ cells are investigated and analyzed at different depths of discharge. A model of the equivalent electrical circuit is proposed, and the coefficients describing the electrode reactions are estimated
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
The involvement of tumour suppressor p53 in normal and chronic myelogeneous leukemia hemopoiesis
No full textWe investigated the expression of p53 in paraformaldehyde-lysine-periodate fixed normal and chronic myelogenous leukemia (CML) hemopoietic cells with flow cytometry and two monoclonal antibodies, PAb1801 and the mutant-conformation-associated PAb240. With both antibodies p53 proteins were detected in more than 50% of CD34+ cells and in more than 95% neutrophils but were undetectable in the CD34- myeloid precursors. The expression of a p53 protein reactive with PAb240 was closely associated with CD34+/HLA-DR+ cells and with cells in active cell cycle, while the p53 protein recognized by PAb1801 was mainly found in CD34+/HLA-DR- cells and in cells in the G0/G1 phases of the cell cycle. Treatment of chronic-phase CML cells with p53 antisense oligonucleotides resulted in significantly increased numbers of granulocyte-macrophage colony-forming unit colonies in 12 of 17 cases studied. Slightly reduced granulocyte-macrophage colony-forming unit colony numbers were observed in one case and no change in the four others. In eight samples of normal bone marrow cells, treatment with antisense oligonucleotides showed no consistent changes in granulocyte-macrophage colony-forming unit numbers. Our data suggest that the expression of the tumor suppressor p53 is involved in the regulation of both normal and CML hemopoiesis and that the inhibition of p53 expression could modulate the proliferation of CML hemopoietic cells and possibly of normal cells
Similarity of p53 expression by CD34+ cells in chronic myeloid leukemia and normal progenitors detected by flow cytometry
No full textNo abstract availabl
The involvement of tumour suppressor p53 in normal and chronic myelogeneous leukemia hemopoiesis
No full textWe investigated the expression of p53 in paraformaldehyde-lysine-periodate fixed normal and chronic myelogenous leukemia (CML) hemopoietic cells with flow cytometry and two monoclonal antibodies, PAb1801 and the mutant-conformation-associated PAb240. With both antibodies p53 proteins were detected in more than 50% of CD34+ cells and in more than 95% neutrophils but were undetectable in the CD34- myeloid precursors. The expression of a p53 protein reactive with PAb240 was closely associated with CD34+/HLA-DR+ cells and with cells in active cell cycle, while the p53 protein recognized by PAb1801 was mainly found in CD34+/HLA-DR- cells and in cells in the G0/G1 phases of the cell cycle. Treatment of chronic-phase CML cells with p53 antisense oligonucleotides resulted in significantly increased numbers of granulocyte-macrophage colony-forming unit colonies in 12 of 17 cases studied. Slightly reduced granulocyte-macrophage colony-forming unit colony numbers were observed in one case and no change in the four others. In eight samples of normal bone marrow cells, treatment with antisense oligonucleotides showed no consistent changes in granulocyte-macrophage colony-forming unit numbers. Our data suggest that the expression of the tumor suppressor p53 is involved in the regulation of both normal and CML hemopoiesis and that the inhibition of p53 expression could modulate the proliferation of CML hemopoietic cells and possibly of normal cells
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
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