1,720,974 research outputs found
Influence of the texture on the efficiency of thermal desorption process of soils contaminated with crude oil
Get PDFThe hereby paper presents the experimental research on the influence of three types of soil texture on the
efficiency of decontamination performed using the technology of thermal desorption. The concentrations of
crude oil of the soil samples, the initial ones as well as those following the depollution process were
determined using the Soxhlet method. The decontamination process with thermal desorption on soil samples
was performed using the electric oven with chamber, and with silicon carbide bars. Experimental researches
were performed on the following types of soils: loamy sand, loam and loamy clay. The main parameters
established for the process of thermal desorption were the temperature 350 °C and the amount of time for
keeping the soil samples in the oven, of 5, 10 and 15 minutes. The results of the experiments indicated that
the type of texture has influenced the efficiency of the thermal desorption, and the highest efficiency was
obtained for the sample of loamy sand, treated for 15 minutes
Influence of the texture on the efficiency of thermal desorption process of soils contaminated with crude oil
Get PDFThe hereby paper presents the experimental research on the influence of three types of soil texture on the efficiency of decontamination performed using the technology of thermal desorption. The concentrations of crude oil of the soil samples, the initial ones as well as those following the depollution process were determined using the Soxhlet method. The decontamination process with thermal desorption on soil samples was performed using the electric oven with chamber, and with silicon carbide bars. Experimental researches were performed on the following types of soils: loamy sand, loam and loamy clay. The main parameters established for the process of thermal desorption were the temperature 350 °C and the amount of time for keeping the soil samples in the oven, of 5, 10 and 15 minutes. The results of the experiments indicated that the type of texture has influenced the efficiency of the thermal desorption, and the highest efficiency was obtained for the sample of loamy sand, treated for 15 minutes
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
STUDIES AND RESEARCH ON POLLUTION OF ENVIRONMENTAL FACTORS IN THE AREA SC ROMPLUMB BAIA MARE FROM ANTHROPOGENICAL ACTIVITY
Get PDFThe main ways of soil pollution are: on path air or atmospheric path and on terrestrial path, pollution path of direct their. Sources of air pollution are two categories: natural sources (volcanic eruptions, decomposition acts, etc.) and artificial, resulting from human activities (mining and metallurgy, energy, etc.). Solid air pollutants are those treated in the paper. They are dispersed in the air from emissions of particles which containing heavy metal ions in the atmosphere having a low sedimentation rate. Finest particles, dispersed in the air gets a considerable stability, for which will persist for a much longer time in air, thereby of increasing pollution. Direct pollution comes from direct deposit of minerals on the soil as raw materials and hazardous waste, particle entrainment by deflation surface dumps, infiltration of sewage from emplacement, accidental discharge of sewage from the emplacement and crack pipes, etc. This paper shows how it is influenced soil pollution and crack pipes, etc. from the perimeter intrauzinal and extrauzinal of SC Romplumb SA by two of the factors leading to pollution, conveying technological waste water and atmospheric emissions, respectivelly
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe 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
COPPER INFLUENCE ON GERMINATION AND GROWTH OF SUNFLOWER (‟HELIANTHUS ANNUUS”)
Get PDFHeavy metal pollution is an important issue worldwide and one of the technologies that can be sustainable in treating the contamination is phytoremediation. One of the plants that is known to tolerate heavy metals is Helianthus annuus. It can deal with heavy metals like Zn, Pb, Ni, Cr, Cd, Cu, As, Fe. In this study, our aim was to determine the plant\u27s tolerance to copper and to investigate its influence on the germination of seeds and plant growth. The measurements and collection of data were made one week after establishing the seed germination test. We analysed which was the highest concentration of copper that the seeds of sunflower can tolerate and what is the effect at low and high concentrations. For a low concentration of copper, the germination rate was high, while a high concentration was toxic. We compared the root and shoot lengths and the fresh and dry weight of the plants to determine the effect of copper on the plant\u27s development. Our investigation concluded that the highest seed copper tolerance of 90 % was at 1 ppm concentration and it decreased significantly to 16 % at the concentration of 10 ppm. At the highest concentrations, the tolerance was low and the seeds had an abnormal development
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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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