oalib

OALib Journal期刊

ISSN: 2333-9721

费用:99美元

投稿

时间不限

4 ( 1 )

2018 ( 22 )

2017 ( 19 )

2016 ( 41 )

自定义范围…

匹配条件: “Rocha” ,找到相关结果约8670条。
列表显示的所有文章,均可免费获取
第1页/共8670条
每页显示
Simple General Purpose Ion Beam Deceleration System Using a Single Electrode Lens  [PDF]
J. Lopes, J. Rocha
World Journal of Engineering and Technology (WJET) , 2015, DOI: 10.4236/wjet.2015.33014
Abstract: Ion beam deceleration properties of a newly developed low-energy ion beam implantation system were studied. The objective of this system was to produce general purpose low-energy (5 to 15 keV) implantations with high current beam of hundreds of μA level, providing the most wide implantation area possible and allowing continuously magnetic scanning of the beam over the sample(s). This paper describes the developed system installed in the high-current ion implanter at the Laboratory of Accelerators and Radiation Technologies of the Nuclear and Technological Cam-pus, Sacavém, Portugal (CTN).
Robert Mayer: Conservation of Energy and Venous Blood Colour  [PDF]
Teresa Rocha-Homem
Advances in Historical Studies (AHS) , 2015, DOI: 10.4236/ahs.2015.44020
Abstract: The concept of conservation and transformation of energy was proposed by the 19th century doctor, Robert Mayer. This concept derives from a clinical observation. During the 1st centennial celebrations, the medical profession posed the question of whether Mayer had indeed observed what he claimed and took as the basis of the principle of conservation of energy: if the colour of venous blood in the tropics was lighter than in colder regions, then this was a result of a higher oxygen consumption to maintain body temperature. In this paper, it was shown that, based on Mayer’s data and contemporary physiology, this observation could indeed have occurred but for a different reason.
Moral Dilemma Judgment Revisited: A Loreta Analysis  [PDF]
Armando Freitas da Rocha, Fábio Theoto Rocha, Eduardo Massad
Journal of Behavioral and Brain Science (JBBS) , 2013, DOI: 10.4236/jbbs.2013.38066
Abstract:

Background: Recent neuroscience investigations on moral judgment have provided useful information about how brain processes such complex decision making. All these studies carried out so far were fMRI investigations and therefore were constrained by the poor temporal resolution of this technique. Recent advances in electroencephalography (EEG) analysis provided by Low Resolution Tomogray (Loreta), Principal Component (PCA), Correlation and Regression Analysis improved EEG spatial resolution and made EEG a very useful technique in decision-making studies. Methods: Here, we reinvestigate previous fMRI study of personal (PD) and impersonal (ID) moral dilemma judgment, taking profit of these new EEG analysis improvements. Results: PCA analysis disclosed three different patterns of brain activity associated with dilemma judgment. These patterns are proposed to disclose the neural circuits involved in benefit and risk evaluation, calculating intention to act and controlling decision-making. Regression analysis showed that activity at some cortical areas favors action implementation by increasing intention to act, while activity at some other areas opposes it by decreasing intention to act. Comparison with Existing Methods: Compared to the previous fMRI results, Loreta and PCA revealed a much greater number of cortical areas involved in dilemma judgment, whose temporal and spatial distribution were different for ID compared to PD. The present paper suggests that whenever final temporal details of the decision making process are desired,

Potencial ecológico para o manejo de frutos de a?aizeiro (Euterpe precatoria Mart.) em áreas extrativistas no Acre, Brasil
Rocha, Elektra;
Acta Amazonica , 2004, DOI: 10.1590/S0044-59672004000200012
Abstract: one of the species with a diversification potential for non-timber forest products is euterpe precatoria mart., whose fruit management for pulp production includes social, economical and ecological aspects. this study analyzes the density, structure, dynamics and stability of a population euterpe precatoria in terra firme and inundated forests to evaluate the ecological potential of management. the mean adult density in inundated forests was 60 individuals ha-1 and 23 individuals ha-1 in terra firme forest. population structure showed an inverse j shape. there was a high fruit production and the population stability was variable among the study sites. these ecological characteristics suggest that this species has a high management potential, such as high density and frequency, abundant regeneration and high fruit production. a greater management potential was observed in inundated forests when compared with terra firme.
Are error correction models the best alternative to assess capital mobility in developing countries?
Rocha, Fabiana;
Economia Aplicada , 2006, DOI: 10.1590/S1413-80502006000200007
Abstract: jansen (1996) and jansen and schulze (1996), based on a sample of developed countries argue that an error correction model would be the correct specification to estimate saving-investment correlations. the purpose of this paper is to verify if the same claim can be made using a sample of developing countries. regarding developing countries is an error correction model indeed superior, as suggested by jansen and jansen and schulze? how serious is the potential bias from using regressions in levels and in first differences instead of an error correction model? although the theory implies that there is a long-run relationship between saving and investment, this does not seem to be the case for the majority of the developing economies individually. therefore, the equation in differences is not poorly specified. based on this equation it seems to be an intermediate degree of capital mobility in developing countries according to the criterion of feldstein and horioka.
O programa Bolsa Família: evolu??o e efeitos sobre a pobreza
Rocha, Sonia;
Economia e Sociedade , 2011, DOI: 10.1590/S0104-06182011000100005
Abstract: after a brief retrospective of the evolution of income transfer programs in brazil, this article uses information from the 2004 and 2006 official national household survey (pnad) in order to analyze the recent evolution of the bolsa familia program regarding targeting and coverage. despite the fact that the bf met its goal of assisting 11 million households by the end of 2006, still around 3.4 million eligible households do not receive the transfer benefit. simulations show that guaranteeing the basic income transfer to all eligible households has a stronger impact on poverty indicators than to grant the new benefit - created in 2008 - to youngsters who live in the already assisted households.
Dinamica da concentra??o de mercado na indústria Brasileira, 1996-2003
Rocha, Frederico;
Economia e Sociedade , 2010, DOI: 10.1590/S0104-06182010000300003
Abstract: the aim of this paper is to study the changes in market concentration in the brazilian mining and manufacturing industries that took place from 1996 to 2003. the paper decomposes the herfindahl-hirschman index into variations in the size distribution and the number of firms. the results show that the average concentration did not change greatly in the period analyzed; however, a small group of industries showed significant differences in concentration. in these cases, changes in size distribution appear to have more importance than changes in the number of firms.
Pobreza e indigência no Brasil: algumas evidências empíricas com base na PNAD 2004
Rocha, Sonia;
Nova Economia , 2006, DOI: 10.1590/S0103-63512006000200003
Abstract: this article presents income-based indicators using the data from the 2004 brazilian national household survey regarding poverty and indigence in 2004. it refers to spatial characteristics of poverty, as well as its relation with the functioning of the labor market and the way family income is formed. the relatively sharp reduction in poverty and indigence from 2003 to 2004, the best result obtained since the real plan was implemented, constitutes the background for the analysis, although the impact of this reduction is spatially differentiated, more favorable in rural areas and less so in the s?o paulo metropolitan area. the increase in family income is mainly due to the vigorous expansion of occupation, as the average labor income remained unchanged. nevertheless, poor individuals benefited from the reduction in the returns to schooling, from the real increase in the minimum wage and from the wider scope of the social security net, which resulted in a more vigorous income increase at the base of distribution, thus leading to a reduction in inequality.
Do caranguejo vermelho ao Cristo cor-de-rosa: as campanhas educativas para a preven??o do cancer no Brasil
Rocha, Vania;
História, Ciências, Saúde-Manguinhos , 2010, DOI: 10.1590/S0104-59702010000500015
Abstract: cancer prevention campaigns in brazil are an important feature of the history of efforts to control this disease. the material produced down through this history offers a rich source of documents that merit the attention of professionals in such areas as education, communication, information, public health, history, and scientific educational outreach. starting from this premise, i have analyzed education campaign material coming from different fields of knowledge. my notes are the result of a preliminary analysis of campaign posters from the perspective of the history of health education. this research will be further developed.
Capital mobility in developing countries: evidence from panel data
Rocha, Fabiana;
Estudos Econ?micos (S?o Paulo) , 2007, DOI: 10.1590/S0101-41612007000300004
Abstract: the purpose of this paper is to show that the use of panel data can shed some light on the feldstein-horioka puzzle. the use of panel data would bring in two advantages. first, it would avoid the bias towards low capital mobility brought by the use of time-averaged data. second, it would make possible to take into account specific effects (heterogeneity) like a country's size. pooling annual data for the period 1960-1996 for 29 developing countries, the estimated impact of saving on investment is considerably smaller and it is possible to conclude that there is some degree of capital mobility in developing countries. therefore, the high estimated saving-investment correlation seems to be due more to the existence of specific individual country effects than to capital immobility. the coefficient stability through time remains a puzzle though.
第1页/共8670条
每页显示


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.