Suarez D.,University of Aalborg |
Suarez D.,National University of General Sarmiento
Research Policy | Year: 2014
The concept of persistence is generally used to define the positive relationship between past and present innovations, which is explained by feedback and accumulation processes triggered by the firm's past results. This paper states that changes in the economic or institutional conditions of the environment impact on the type of profitable innovations, and past innovations might not be suitable for the new environment. As a result, firm's innovative behavior might change, which means that the firm's set of decisions about engaging in the seek for innovations or not and, if so, the set of investments and capabilities it allocates to innovate could be modified. Empirical evidence is provided to reject the persistence hypothesis and to show that past innovations do not necessarily impact present ones. This paper examines the relationship between past and present innovations for a group of Argentinean firms during 1998-2006, which coincides with a period of macroeconomic instability. Results suggest that persistence has to be analyzed in terms of a dynamic firm's innovative behavior - regardless of its results - and how it allows the firm to accumulate competences and resources, which increases the odds of successfully responding to changes in the environment and continuing to innovate. © 2013 Elsevier B.V.
Agency: Cordis | Branch: FP7 | Program: CSA-SA | Phase: SSH-2007-8.0-02 | Award Amount: 777.52K | Year: 2008
The EULAKS project is premised on the assumption that by providing in-depth insights into socio-economic and policy development processes of other regions the Socio-Economic Sciences and Humanities (SSH) can make a valuable contribution to meeting the EUs ambitious challenges as set out by the Lisbon and Gothenburg Summits, particularly in the context of the opening of the European Research Area (ERA) to third countries and regions. The project is aimed at raising the profile of SSH research activities and networks in Latin American and Caribbean (LAC) countries in order to make sure that the ERA can fully benefit from key contributions that substantially improve the understanding of the changing socio-economic dynamics of the Information and Knowledge Society in both regions. A principal goal of the project is the creation of a space for horizontal learning between communities of SSH scholars and communities of relevant stakeholders and policy-makers. To attain this goal, the project will connect European and Latin American and Caribbean communities of scholars, research organisations and key agencies from a broad rage of SSH disciplines that vary in their research focus and methodological preference yet have made significant contributions to the building of a shared understanding of the Knowledge Society. EULAKS attaches priority to the promotion of the shared EU-LAC Knowledge Area through the support for the forging of close bi-regional ties between SSH research communities with a focus on the design, implementation and monitoring of science, technology and innovation (STI) policies.
Arrossi S.,CONICET |
Maceira V.,National University of General Sarmiento |
Paolino M.,CONICET |
Sankaranarayanan R.,International Agency for Research on Cancer IARC
Vaccine | Year: 2012
In Argentina, human papillomavirus (HPV) vaccination was approved in 2006, but not included in the National Immunization Program. In 2008 a mass media campaign was carried out by a cancer Non-Governmental Organization (NGO), but it was stopped due to criticisms about the publicity. In October 2011 the Ministry of Health (MoH) has introduced HPV vaccination in the National Immunization Program. In this context, to assure high HPV vaccine coverage, evidence is needed on factors both associated to vaccine acceptability and uptake. In 2009-2010 we carried out a population-based survey among a representative sample of 1200 women aged 18-49 years from the Metropolitan Area of Buenos Aires. The objective was twofold: first to analyze socio-demographic determinants of women's knowledge on HPV vaccine and secondly, determinants of actual HPV vaccine uptake and acceptability in Argentina after the above-mentioned vaccine advertising shown in mass media in the year 2008.We analyzed vaccine uptake/acceptability separately for women and for their daughters aged 9-15, and willingness to vaccinate one's daughter younger than 9 to receive future HPV vaccination. Results of the 1200 women interviewed, 438 women (36.5%) knew the HPV vaccine and 303 (25%) remembered the mass media advertisement about HPV vaccination. When asked whether she would get vaccinated after having seen/heard the advertisement, around 75% (n= 226) of women answered surely/probably yes. No significant differences in socio-demographic characteristics were found among women who would or not get vaccinated. When surveyed, 6 women had been vaccinated. Main reasons for non-vaccination were: "Doctor did not mention/recommend it" (34.1%) and "Vaccine is too expensive" (15.7%). No woman had had their 9-15 year-old daughter vaccinated. Among women who only had at least one daughter under 9 (n= 278), 74% answered that they would get their daughter vaccinated if they were pre-adolescents. The conclusion is that, in Argentina, the potential acceptability of the vaccine is high, given that there is acceptance among the professional community, physicians recommend it, and vaccine is affordable. © 2012 Elsevier Ltd.
Braga M.,National University of General Sarmiento |
Marenco J.,National University of General Sarmiento
RAIRO - Operations Research | Year: 2016
In a previous work we presented six facet-inducing families of valid inequalities for the polytope associated to an integer programming formulation of the acyclic coloring problem. In this work we study their disjunctive rank, as defined by [E. Balas, S. Ceria and G. Cornuéjols, Math. Program. 58 (1993) 295-324]. We also propose to study a dual concept, which we call the disjunctive anti-rank of a valid inequality. © 2016 EDP Sciences, ROADEF, SMAI.
Barrionuevo M.R.,National University of General Sarmiento |
Vullo D.L.,National University of General Sarmiento
World Journal of Microbiology and Biotechnology | Year: 2012
Fixed-bed reactors are usually designed for wastewater biotreatments, where the biofilm establishment and maintenance play the most important roles. Biofilm development strictly relies on different types of bacterial motility: swimming, swarming, and chemotaxis, which can be altered by the microenvironment conditions. The aim of this work is to do an integrated study on the effects of Cu(II), Cd(II), Zn(II) and Cr(VI) on swimming, swarming and chemotaxis of Pseudomonas veronii 2E, Delftia acidovorans AR and Ralstonia taiwanensis M2 to improve biofilm development and maintenance for metal loaded wastewater biotreatment in fixed-bed bioreactors. Swimming, swarming and chemotactic response evaluation experiments were carried out at different metal concentrations. P. veronii 2E motility was not affected by metal presence, being this strain optimal for fixed-bed reactors. D. acidovorans AR swarming was inhibited by Cd and Zn. Although R. taiwanensis M2 showed high resistance to Cu, Cd, Cr and Zn, motility was definitively altered, so further studies on R. taiwanensis M2 resistance mechanisms would be particularly interesting. © 2012 Springer Science+Business Media B.V.
Saravia L.A.,National University of General Sarmiento
Methods in Ecology and Evolution | Year: 2015
Summary: Species-area relationships (SAR) and species-abundance distributions (SAD) are among the most studied patterns in ecology, due to their application to both theoretical and conservation issues. One problem with these general patterns is that different theories can generate the same predictions, and for this reason, they cannot be used to detect different mechanisms of community assembly. A solution is to search for more sensitive patterns, for example by extending the SAR to the whole SAD. A generalized dimension (Dq) approach has been proposed to study the scaling of SAD, but to date, there has been no evaluation of the ability of this pattern to detect different mechanisms. An equivalent way to express SAD is the rank-abundance distribution (RAD). Here I introduce a new way to study SAD scaling using a spatial version of RAD: the species-rank surface (SRS), which can be analysed using Dq. Thus, there is an old Dq based on SAR (DqSAD), and a new one based on SRS (DqSRS). I perform spatial simulations to examine the relationship of Dq with SAD, spatial patterns and number of species. Finally, I compare the power of both Dq, SAD, SAR exponent and the fractal information dimension to detect different community patterns using a continuum of hierarchical and neutral spatially explicit models. The SAD, DqSAD and DqSRS all had good performance in detecting models with contrasting mechanisms. DqSRS, however, had a better fit to data and allowed comparisons between hierarchical communities where the other methods failed. The SAR exponent and information dimension had low power and should not be used. SRS and DqSRS could be interesting methods to study community or macroecological patterns. © 2015 British Ecological Society.
Milesi D.,National University of General Sarmiento |
Petelski N.,National University of General Sarmiento |
Verre V.,National University of General Sarmiento
Technovation | Year: 2013
This paper analyzes the use of mechanisms for the appropriation of innovation profits in Argentine industry, using data on around 200 firms belonging to five industrial sectors. It includes a theoretical discussion of the concept of appropriability and, contrary to what is widely accepted in innovation literature about the influence of appropriability on innovation efforts, argues that the chosen appropriation strategy is determined by the characteristics of the innovation process (innovative effort, type of results obtained, accumulated capabilities, cooperation, and public support) and structural characteristics of the firm (technological intensity, firm size, and age). Probit models are specified and estimated in order to identify the main determinants of the use of each mechanism. The results show that the characteristics of the innovation process indeed influence the choice of appropriation strategy, and the use of each mechanism responds to different aspects of the innovation process. The descriptive statistics show that the use of strategic mechanisms is greater than the use of legal ones, indicating the existence of different sectoral appropriation patterns. © 2012 Elsevier Ltd. All rights reserved.
Saravia L.A.,National University of General Sarmiento
F1000Research | Year: 2014
Multifractals have been applied to characterize complex communities in a spatial context. They were developedfor nonlinear systems and are particularly suited to capture multiplicative processes observed in ecologicalsystems. Multifractals characterize variability in a scale-independent way within an experimental range. Ihave developed an open-source software package to estimate multifractals using a box-counting algorithm(available from https://github.com/lsaravia/mfsba and permanently available at doi: 10.5281/zenodo.8481).The software is specially designed for two dimensional (2D) images such as the ones obtained from remotesensing, but other 2D data types can also be analyzed. Additionally I developed a new metric to analyze multispecies spatial patterns with multifractals: spatial rank surface, which is included in the software. © 2014 Saravia LA.
Garavaglia L.,National University of General Sarmiento |
Cerdeira S.B.,National University of General Sarmiento |
Vullo D.L.,National University of General Sarmiento
Journal of Hazardous Materials | Year: 2010
The high solubility of Cr(VI) in aqueous systems, together with carcinogenic and mutagenic effects on living organisms, make industrial effluents receive specific treatments for Cr(VI) elimination. Biotreatments, based on biotransformation of Cr(VI) to Cr(III) which is immobilized as Cr(OH)3, are the most effective methods for the removal of Cr(VI) concentrations below 2 mM. The aim of our study is the application of pure or mixed bacterial cultures for Cr(VI) biotransformation followed by chemical flocculation of Cr(OH)3 as a combined treatment for industrial wastes. Pseudomonas veronii 2E, Delftia acidovorans AR, Klebsiella oxytoca P2 and Klebsiella ornithinolytica 1P, isolated from polluted environments showed a decrease from 38.83 to 74.32%, in 0.05 mM of initial Cr(VI). As revealed DGGE experiments, P. veronii 2E and K. ornithinolytica 1P could develop together in cocultures and in these conditions a 72.88% of Cr(VI) present was removed. Although the pH of the cultures was 8, no Cr(OH)3 sediment was detected. The results of total chromium quantification support this observation. The precipitation of Cr(III) was induced using different commercial flocculants. Best yields were obtained using Na2CO3 0.1 M, which allowed the flocculation of almost 100% of Cr(III) present. This combined treatment would be an economical and ecological way to remove Cr(VI). © 2009 Elsevier B.V. All rights reserved.
Andruchow E.,National University of General Sarmiento |
Andruchow E.,Instituto Argentino Of Matematica
Complex Analysis and Operator Theory | Year: 2014
A pair (P, Q) of orthogonal projections in a Hilbert space H is called a Fredholm pair if QP : R(P) → R(Q) is a Fredholm operator. Let F be the set of all Fredholm pairs. A pair is called compact if P-Q is compact. Let C be the set of all compact pairs. Clearly C ⊂ F properly. In this paper it is shown that both sets are differentiable manifolds, whose connected components are parametrized by the Fredholm index. In the process, pairs P, Q that can be joined by a geodesic (or equivalently, a minimal geodesic) of the Grassmannian of H are characterized: this happens if and only if (Formula presented.). © 2013, Springer Basel.