1,720,989 research outputs found
ON THE EFFECTS OF IMMIGRATION ON HOST COUNTRIES
Full text linkStarting from the consolidated literature on the labour market effects of immigration (summarized in the second chapter in what follows) the aims of this work are: (i) to assess the impact of skilled immigration on income in destination countries (chapter 3) and (ii) to understand the relation between immigration and offshoring when asymmetric information about foreing born workers is assumed (chapter 4). So, the rest of the thesis is composed follows:
Chapter 2, "The economic impact of migration on host countries: a survey", provides a survey of the literature on the effects of migration on the economic performances in host countries. The aim of the chapter is to provide a synthetic view of both theoretical and empirical literature to better understand how host economies are affected by changes in their foreign born population endowment. The chapter is intended to clear the ground for the following chapters.
Chapter 3, "Skilled migration and economic performances: evidence from OECD countries", investigates the effects of immigration flows and their human capital content on per capita GDP variation in 24 OECD host countries. Theoretical models conclude that the effect of immigrants in host country's income depends on the human capital content of migrants (Benhabib 1996); empirically the question is still open and this paper contributes to make light on this. So we propose an empirical estimation of the effects of immigrants and their human capital content on per capita GDP variation. Using an IV model to solve the endogeneity problem we found that high human capital content by immigrants has a positive effect on per capita GDP variation, but it is not enough to fully compensate the overall negative effects of migration on changes in per capita output.
Chapter 4, "Offshoring, migrants and natives workers: the optimal choice under asymmetric information", presents a theoretical model about the optimal choice for a firm between offshoring and hiring immigrant workers under asymmetric information about their ability and effort in production (symmetric information is assumed about home born workers). When a domestic firm hires an immigrant it doesn't know his ability; while when the firm goes abroad it uses local agent in order to buy additional information about workers, thus enforceable contracts may be set. We show that it is optimal for firms to produce low quality products offshoring the production abroad, while intermediate quality level products will be produced at home using foreign born workers. Finally, high quality products will be produced using native workers
[Grand-mal primary generalized epilepsy and the menstrual cycle. Apropos of a clinical case].
No full text
Gas chromatographic quantitative determination of essential oil in the alcoholic extract of citrus peel and in citrus based liqueurs.
No full textThe work describes an analytical procedure that allows the quantitative determination by gas-chromatography of the concentration of the components of the essentil oils in the extracts and in the lemon liquors. This would allow to standardize the preparation of the liquors by knowing the concentration of the essential oils responsible for the aroma in the lemon liquor. The results are highly reproducible and analitically verified
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
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