1,721,038 research outputs found
THE EFFECT OF THINNING ON THE WOOD BASIC DENSITY OF Eucalyptus nitens (Deane & Maiden) Maiden
No full textEucalyptus nitens (Deane & Maiden) Maiden has positioned itself as an alternative species for the creation of forests of rapid growth, tolerant to a wide range of environmental conditions. A large supply of high quality products is expected by implementation of intensive thinning and pruning, which will increase the economical values and profitability obtained from this plantations. The present study aims to evaluate the effect of thinning on the basic density of E. nitens wood, and to model the basic wood density according to log height. The experiment was carried on an E. nitens stand located in Arauco, Central Chile. A factorial model with three levels was used as the experimental design for evaluation of the effect of residual stand density on basic wood density. The main factor is the residual stand density and the treatments are 1100 (without thinning), 800 and 400 trees/ha using three repetitions per treatment. For the modeling of basic wood density, regression models of segmented polynomial were utilized. Eight years after thinning the results showed that it did not have significant effect in the E. nitens basic wood density. On the other hand, modeling basic wood density reached acceptable and consistent levels when the segmented model was used to adjust the average by relative height class
THE EFFECT OF THINNING ON THE WOOD BASIC DENSITY OF Eucalyptus nitens (Deane & Maiden) Maiden
No full textEucalyptus nitens (Deane & Maiden) Maiden has positioned itself as an alternative species for the creation of forests of rapid growth, tolerant to a wide range of environmental conditions. A large supply of high quality products is expected by implementation of intensive thinning and pruning, which will increase the economical values and profitability obtained from this plantations. The present study aims to evaluate the effect of thinning on the basic density of E. nitens wood, and to model the basic wood density according to log height. The experiment was carried on an E. nitens stand located in Arauco, Central Chile. A factorial model with three levels was used as the experimental design for evaluation of the effect of residual stand density on basic wood density. The main factor is the residual stand density and the treatments are 1100 (without thinning), 800 and 400 trees/ha using three repetitions per treatment. For the modeling of basic wood density, regression models of segmented polynomial were utilized. Eight years after thinning the results showed that it did not have significant effect in the E. nitens basic wood density. On the other hand, modeling basic wood density reached acceptable and consistent levels when the segmented model was used to adjust the average by relative height class
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
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
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
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
Essays on International Private Debt
Get PDFUniversity of Minnesota Ph.D. dissertation. May 2021. Major: Economics. Advisors: Manuel Amador, Timothy Kehoe. 1 computer file (PDF); viii, 154 pages.This dissertation consists of three chapters. A unifying theme across all chapters is the interaction between international private debt and government's policies. The first chapter argues that excessive international private debt increases the frequency and severity of sovereign debt crises. I develop a quantitative theory of private and public debt that allows me to measure the level of private overborrowing and its effect on the interest rate spread on public debt. In an environment where private credit is constrained by the market value of income, individually optimal private borrowing decisions are inefficient at the aggregate level. High private debt increases the probability of a financial crisis, characterized by a large deleveraging in private debt and a contraction in consumption. During such crises, the drop in consumption is amplified trough the endogenous decline in the market value of collateral. To counter this reduction, the government responds with fiscal bailouts financed with risky external public debt. This response may cause a sovereign debt crisis, which is characterized by high interest rates spreads, and in some cases, default. I find that the theory is quantitatively consistent with the evolution of international private debt, international public debt, and sovereign spreads in Spain from 1999 to 2015. I estimate that excessive private debt raised the interest rate spread on public bonds by at least 3.8 percentage points at its peak in 2012. The second chapter, in turn, proposes a theory of foreign reserves as macroprudential policy. This Chapter was written in collaboration with Julien Bengui and Javier Bianchi. We study an open economy model of financial crises, in which pecuniary externalities lead to overborrowing, and show that by accumulating international reserves, the government can achieve the constrained-efficient allocation. The optimal reserve accumulation policy leans against the wind and significantly reduces the exposure to financial crises. The theory can explain the empirical patterns of public and private international capital flows, both in the cross-section and over time. The third chapter examines the interaction between international debt and inequality. This chapter was written in collaboration with Monica Tran-Xuan. We introduce household heterogeneity in a standard model of sudden stop crises. We find that although there is overborrowing at the aggregate level this result is not true for all types of households. While high income households overborrow, low income households underborrow. In future versions of this paper we would like to study the implications of this result for the redistributional consequences of macroprudential policies.Arce Munoz, Fernando. (2021). Essays on International Private Debt. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/223188
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