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Search Results: 1 - 10 of 14872 matches for " Pablo Gonzalez "
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Revista de análisis económico , 2010, DOI: 10.4067/S0718-88702010000100005
Abstract: we consider an economy under a fixed exchange rate system, but with bounds (a minimum level or a band) on the real exchange rate. the international price of the tradable good is characterized by the continuous arrival of shocks that change its level. in a model with microfoundations, we investigate the effects of targeting the real exchange rate through nominal exchange rate changes that preclude the real exchange from trespassing the imposed bounds. a stochastic general equilibrium model with two goods and fixed non-tradable goods price level is developed. we analyze the cases in which a lower bound or a band on the real exchange rate is introduced. the general conclusion is that when bounds are established, then welfare effects can be expected, which are generated at the expense of the levels of consumption that go in the opposite direction than what the policy intended. this short-run effect is present even in the case the targeting policy is never exercised. this result is similar to the one we find in the target zones literature, in the sense that just the existence of this tolerance band changes the behavior of the economy. an interesting result is that, in the case in which home goods prices are fixed, the imposition of the band on the real exchange rate does not change its behavior within the band. however, this result is not true of other real variables in the economy. in other words, although the targeted variable within the band behaves identically to the case in which there are no bounds, the rest of the real variables in the economy behave differently, even if the targeted variable remains within the band and the escape clause is not triggered.
Timing Calibration of the ANTARES Neutrino Telescope
Juan Pablo Gomez-Gonzalez
Physics , 2009,
Abstract: On May 2008 the ANTARES collaboration completed the installation of a neutrino telescope in the Mediterranean Sea. This detector consists of a tridimensional array of almost 900 photomultipliers (PMTs) distributed in 12 lines. These PMTs can collect the Cherenkov light emitted by the muons produced in the interaction of high energy cosmic neutrinos with the matter surrounding the detector. A good timing resolution is crucial in order to infer the neutrino track direction and to make astronomy. In this presentation I describe the time calibration systems of the ANTARES detector including some measurements (made both at the laboratory and in-situ) which validate the expected performance.
Dynamic Adjustment of the Motivation Degree in an Action Selection Mechanism
Carlos Gershenson,Pedro Pablo Gonzalez
Computer Science , 2002,
Abstract: This paper presents a model for dynamic adjustment of the motivation degree, using a reinforcement learning approach, in an action selection mechanism previously developed by the authors. The learning takes place in the modification of a parameter of the model of combination of internal and external stimuli. Experiments that show the claimed properties are presented, using a VR simulation developed for such purposes. The importance of adaptation by learning in action selection is also discussed.
An indicator of journal impact that is based on calculating a journal's percentage of highly cited publications
Sara M. Gonzalez-Betancor,Pablo Dorta-Gonzalez
Computer Science , 2015,
Abstract: The two most used citation impact indicators in the assessment of scientific journals are, nowadays, the impact factor and the h-index. However, both indicators are not field normalized (vary heavily depending on the scientific category) which makes them incomparable between categories. Furthermore, the impact factor is not robust to the presence of articles with a large number of citations, while the h-index depends on the journal size. These limitations are very important when comparing journals of different sizes and categories. An alternative citation impact indicator is the percentage of highly cited articles in a journal. This measure is field normalized (comparable between scientific categories), independent of the journal size and also robust to the presence of articles with a high number of citations. This paper empirically compares this indicator with the impact factor and the h-index, considering different time windows and citation percentiles (levels of citation for considering an article as highly cited compared to others in the same year and category).
Comparing journals from different fields of Science and Social Science through a JCR Subject Categories Normalized Impact Factor
Pablo Dorta-Gonzalez,Maria Isabel Dorta-Gonzalez
Computer Science , 2013, DOI: 10.1007/s11192-012-0929-9
Abstract: The journal Impact Factor (IF) is not comparable among fields of Science and Social Science because of systematic differences in publication and citation behaviour across disciplines. In this work, a decomposing of the field aggregate impact factor into five normally distributed variables is presented. Considering these factors, a Principal Component Analysis is employed to find the sources of the variance in the JCR subject categories of Science and Social Science. Although publication and citation behaviour differs largely across disciplines, principal components explain more than 78% of the total variance and the average number of references per paper is not the primary factor explaining the variance in impact factors across categories. The Categories Normalized Impact Factor (CNIF) based on the JCR subject category list is proposed and compared with the IF. This normalization is achieved by considering all the indexing categories of each journal. An empirical application, with one hundred journals in two or more subject categories of economics and business, shows that the gap between rankings is reduced around 32% in the journals analyzed. This gap is obtained as the maximum distance among the ranking percentiles from all categories where each journal is included.
Central indexes to the citation distribution: A complement to the h-index
Pablo Dorta-Gonzalez,Maria Isabel Dorta-Gonzalez
Computer Science , 2013, DOI: 10.1007/s11192-011-0453-3
Abstract: The citation distribution of a researcher shows the impact of their production and determines the success of their scientific career. However, its application in scientific evaluation is difficult due to the bi-dimensional character of the distribution. Some bibliometric indexes that try to synthesize in a numerical value the principal characteristics of this distribution have been proposed recently. In contrast with other bibliometric measures, the biases that the distribution tails provoke, are reduced by the h-index. However, some limitations in the discrimination among researchers with different publication habits are presented in this index. This index penalizes selective researchers, distinguished by the large number of citations received, as compared to large producers. In this work, two original sets of indexes, the central area indexes and the central interval indexes, that complement the h-index to include the central shape of the citation distribution, are proposed and compared.
Impact maturity times and citation time windows: The 2-year maximum journal impact factor
Pablo Dorta-Gonzalez,Maria Isabel Dorta-Gonzalez
Computer Science , 2013, DOI: 10.1016/j.joi.2013.03.005
Abstract: Journal metrics are employed for the assessment of scientific scholar journals from a general bibliometric perspective. In this context, the Thomson Reuters journal impact factors (JIF) are the citation-based indicators most used. The 2-year journal impact factor (2-JIF) counts citations to one and two year old articles, while the 5-year journal impact factor (5-JIF) counts citations from one to five year old articles. Nevertheless, these indicators are not comparable among fields of science for two reasons: (i) each field has a different impact maturity time, and (ii) because of systematic differences in publication and citation behaviour across disciplines. In fact, the 5-JIF firstly appeared in the Journal Citation Reports (JCR) in 2007 with the purpose of making more comparable impacts in fields in which impact matures slowly. However, there is not an optimal fixed impact maturity time valid for all the fields. In some of them two years provides a good performance whereas in others three or more years are necessary. Therefore, there is a problem when comparing a journal from a field in which impact matures slowly with a journal from a field in which impact matures rapidly. In this work, we propose the 2-year maximum journal impact factor (2M-JIF), a new impact indicator that considers the 2-year rolling citation time window of maximum impact instead of the previous 2-year time window. Finally, an empirical application comparing 2-JIF, 5-JIF, and 2M-JIF shows that the maximum rolling target window reduces the between-group variance with respect to the within-group variance in a random sample of about six hundred journals from eight different fields.
Cohesion Fatigue Explains Why Pharmacological Inhibition of the APC/C Induces a Spindle Checkpoint-Dependent Mitotic Arrest
Pablo Lara-Gonzalez,Stephen S. Taylor
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0049041
Abstract: The Spindle Assembly Checkpoint (SAC) delays the onset of anaphase in response to unattached kinetochores by inhibiting the activity of the Anaphase-Promoting Complex/Cyclosome (APC/C), an E3 ubiquitin ligase. Once all the chromosomes have bioriented, SAC signalling is somehow silenced, which allows progression through mitosis. Recent studies suggest that the APC/C itself participates in SAC silencing by targeting an unknown factor for proteolytic degradation. Key evidence in favour of this model comes from the use of proTAME, a small molecule inhibitor of the APC/C. In cells, proTAME causes a mitotic arrest that is SAC-dependent. Even though this observation comes at odds with the current view that the APC/C acts downstream of the SAC, it was nonetheless argued that these results revealed a role for APC/C activity in SAC silencing. However, we show here that the mitotic arrest induced by proTAME is due to the induction of cohesion fatigue, a phenotype that is caused by the loss of sister chromatid cohesion following a prolonged metaphase. Under these conditions, the SAC is re-activated and APC/C inhibition is maintained independently of proTAME. Therefore, these results provide a simpler explanation for why the proTAME-induced mitotic arrest is also dependent on the SAC. While these observations question the notion that the APC/C is required for SAC silencing, we nevertheless show that APC/C activity does partially contribute to its own release from inhibitory complexes, and importantly, this does not depend on proteasome-mediated degradation.
Multiplicacion in vitro de agave cocui trelease a traves de yemas axilares
Salazar,Efrain; Gonzalez,Pablo; Hernandez,Carlos;
Agronomía Tropical , 2009,
Abstract: the cocuy, agave cocui trelease is an important crop for the semiarid zones of the central-west part of venezuela. it is involved in a traditional production systems for liquor, soap, preserves, among others. it is the economical support of many families in lara state, venezuela. normally, the production was based in naturally occurring plants, so supply of plants is limited. in order to increase plant supply and improve the economical activity of these rural communities, asexual propagation systems have been implemented with slow growth rate and plant production not enough to satisfy the demand. a mass propagation system using axillary buds have been established. buds were placed on murashige and skoog (ms) medium supplemented with thyamine (1mg l-1), nicotinic acid (1mg l-1), pyridoxine hcl (1mg l-1), inositol (100mg l-1), ba (1mg l-1), ana (1mg l-1) sucrose (30 g l-1) and agar (5g l-1). forty explants were cultured in 10ml of culture medium, and were placed in the dark for 7 days. buds were placed under fluorescent light (16.95 w.m-2), at 28 ± 2 oc and a 16 hr photoperiod. shoots were observed 1 months after culture, an average of 6 shoots were observed for each cultured axillary bud. sprouting ratio was increased when temperatures was increased to 40 oc. complete plants were obtained by transferring shoots to medium with no hormones. transplant to soil (1:1:1 soil:sand:coconut sawdust) allowed plants to be acclimatized in 1 week. all plants have normal morphology. as a conclusion axillary bud in vitro culture can be referred as an efficient method to propagate a. cocui trelease
Chern-Simons black holes: scalar perturbations, mass and area spectrum and greybody factors
Pablo Gonzalez,Eleftherios Papantonopoulos,Joel Saavedra
Physics , 2010, DOI: 10.1007/JHEP08(2010)050
Abstract: We study the Chern-Simons black holes in d-dimensions and we calculate analytically the quasi-normal modes of the scalar perturbations and we show that they depend on the highest power of curvature present in the Chern-Simons theory. We obtain the mass and area spectrum of these black holes and we show that they have a strong dependence on the topology of the transverse space and they are not evenly spaced. We also calculate analytically the reflection and transmission coefficients and the absorption cross section and we show that at low frequency limit there is a range of modes which contributes to the absorption cross section.
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