Dynamics at infinity and the existence of singularly degenerate heteroclinic cycles in the Lorenz system

In this paper, by using the Poincare compactification in R(3) we make a global analysis of the Lorenz system, including the complete description of its dynamic behavior on the sphere at infinity. Combining analytical and numerical techniques we show that for the parameter value b = 0 the system presents an infinite set of singularly degenerate heteroclinic cycles, which consist of invariant sets formed by a line of equilibria together with heteroclinic orbits connecting two of the equilibria. The dynamical consequences related to the existence of such cycles are discussed. In particular a possibly new mechanism behind the creation of Lorenz-like chaotic attractors, consisting of the change in the stability index of the saddle at the origin as the parameter b crosses the null value, is proposed. Based on the knowledge of this mechanism we have numerically found chaotic attractors for the Lorenz system in the case of small b > 0, so nearby the singularly degenerate heteroclinic cycles.

The immune system of insects and the control of some parasitary human diseases

Parasitic diseases in humans, transmitted by insects, affect about 500 million people living mainly in countries of low economic power, the control of these diseases is difficult to carry out, mainly die to social and political problems, enhanced bg the capacity of these organisms to develop resistance to insecticides used to for their destruction.Some recent advances in the area of insect immunology have open the possibility for abetter epidemiological control of these diseases.The immune system of these insects, as well as that of other organisms, have the ability to recognize the infecting parasites and liberate a series of reactions which stop the infection. These reactions involve the circulating cells (hemocytes) against the parasite. These cells have the ability of phagocytize and liberate the production of various humoral factors, neutralizing the infection.Some promising results, obtained by the study of the immune system of malaria-transmitting insects, the sleeping disease, and dengue, are an example of this new sanitary strategy.

Influence of the cultivation system in the aroma of the volatile compounds and total antioxidant activity of passion fruit

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Youth and social cohesion in Ibero-America: a model in the making. Summary

Includes bibliography

Fractional order and dynamic simulation of a system involving an elastic wide plate

Numerous researchers have studied about nonlinear dynamics in several areas of science and engineering. However, in most cases, these concepts have been explored mainly from the standpoint of analytical and computational methods involving integer order calculus (IOC). In this paper we have examined the dynamic behavior of an elastic wide plate induced by two electromagnets of a point of view of the fractional order calculus (FOC). The primary focus of this study is on to help gain a better understanding of nonlinear dynamic in fractional order systems. © 2011 American Institute of Physics.

On the dynamic behaviour of a nonlinear system weakly connected to a linear single degree-of-freedom system

This paper discusses the dynamic behaviour of a nonlinear two degree-of-freedom system consisting of a harmonically excited linear oscillator weakly connected to a nonlinear attachment that behaves as a hardening Duffing oscillator. A system which behaves in this way could be a shaker (linear system) driving a nonlinear isolator. The mass of the nonlinear system is taken to be much less than that in the linear system and thus the nonlinear system has little effect on the dynamics of the linear system. Of particular interest is the situation when the linear natural frequency of the nonlinear system is less than the natural frequency of the linear system such that the frequency response curve of the nonlinear system bends to higher frequencies and thus interacts with the resonance frequency of the linear system. It is shown that for some values of the system parameters a complicated frequency response curve for the nonlinear system can occur; closed detached curves can appear as a part of the overall amplitude-frequency response. The reason why these detached curves appear is presented and approximate analytical expressions for the jump-up and jump-down frequencies of the system under investigation are given.

Renewable energy sources in Latin America and the Caribbean: situation and policy proposals

Includes bibliography

Intraoperative kinematic evaluation with navigation system and postoperative kinematic evaluation with dynamic RSA of total knee arthroplasty

Restoring a correct implant kinematics and providing a good ligament balance and patellar tracking is mandatory to improve clinical and functional outcome after a Total Knee Replacement. Surgical navigation systems are a reliable and accurate tool to help the surgeon in achieving these goals. The aim of the present study was to use navigation system with an intra-operative surgical protocol to evaluate and determine an optimal implant kinematics during a Total Knee Replacement.

Social and Political Issues and the Finnish Deportees from North America

An important issue in both Canadian and United States immigration history has been the control of immigration, which includes possible quotas, immigration laws as well as denying entry, and finally, the deportation of immigrants. This paper is based on information that is available on the deportations of 167 people, most of them young adult males. Many assume politics was a key motivation for deportation. However, Finnish Americans were rarely deported for political activities. The paper discusses a few interesting cases of political deportations both during the interwar years, and after the Second World War. The information is mostly based on the correspondence between the authorities in Finland and the United States and Canada, available at the Foreign Ministry Archives in Helsinki, Finland. Special attention is directed to the social and political background of those people and of special interest are the specific reasons, social or health problems, which seem to be the basis of most deportation decisions.

The loss of trust in the European Union during the great recession since 2007: The role of heuristics from the national political system

How can we explain the decline in support for the European Union (EU) and the idea of European integration after the onset of the great recession in the fall of 2007? Did the economic crisis and the austerity policies that the EU imposed—in tandem with the IMF—on several member countries help cause this drop? While there is some evidence for this direct effect of EU policies, we find that the most significant determinant of trust and support for the EU remains the level of trust in national governments. Based on cue theory and using concepts of diffuse and specific support, we find that support for the EU is derived from evaluations of national politics and policy, which Europeans know far better than the remote political system of the EU. This effect, however, is somewhat muted for those sophisticated Europeans that are more knowledgeable about the EU and are able to form opinions about it independently of the national contexts in which they live. We also find that the recent economic crisis has led to a discernible increase in the number of those who are disillusioned with politics both at the national and the supranational level. We analyze 133 national surveys from 27 EU countries by estimating a series of cross-classified multilevel logistic regression models.

The political and the social Leaders of the Jewish community of Sepphoris in the second and third centuries

by Adolph Büchler

Democratization and Financial Reform in Taiwan: The Political Economy of Bad-Loan Creation

This study shows that many bad loans now burdening Taiwan's financial institutions are interrelated with the society's democratization which started in the late 1980s. Democratization made the local factions and business groups more independent from the Kuomintang government. They acquired more political influence than under the authoritarian regime. These changes induced them to manage their owned financial institutions more arbitrarily and to intervene more frequently in the state-affiliated financial institutions. Moreover they interfered in financial reform and compelled the government to allow many more new banks than it had originally planned. As a result the financial system became more competitive and the qualities of loans deteriorated. Some local factions and business groups exacerbated the situation by establishing banks in order to funnel funds to themselves, sometimes illegally. Thus many bad loans were created as the side effect of democratization.

From authoritarianism to upheaval : the political economy of the Syrian uprising and regime persistence

The ensuing bloodshed and deteriorating humanitarian crisis in Syria, the failure of the United Nations Security Council to reach a consensus on what action to take, and the involvement of contending external actors partially reflect the complexity of the current impasse. Despite the importance of regional and international factors, however, this papers attempts to argue that the domestic dynamics of the Syrian crisis have been vitally important in determining the course of the popular uprising and the regime’s response. In this, Syria’s crisis belongs with the Arab Spring the trajectories and prospects of which have been shaped by dynamics within regimes. It will be seen that the formal and informal institutional structure of the Ba‘thist regime in Syria has been critical to its resilience and ability to stay united so far while attempting to crush a peaceful popular uprising that turned into insurgency in the face of the regime’s violent crackdown.