Double power law behavior in everyday phenomena

We study similar statistical properties observed in distinct real world data. In particular, we focus on the power law (PL) distribution. We nd that some data is well tted by a single PL distribution whereas other phenomena force the use of two distinct PLs. This behavior is similar in, a priori, unrelated phenomena, such as catastrophes (terrorism, earthquakes) and variables associated to man-made systems, such as distribution of the number of words in texts or of the number of hits received by websites.N/

Complex order van der Pol oscillator

In this paper it is considered a complex order van der Pol oscillator. A complex derivative D®§|¯, with ®; ¯ 2 R+ is a generalization of the concept of integer derivative, where ® = 1; ¯ = 0: By applying the concept of complex derivative, we obtain a high-dimensional parameter space. Amplitude and period values of the periodic solutions of the complex order van der Pol oscillator, are studied for variation of these parameters.N/

Forced van der Pol oscillator of complex order

In this paper it is considered a complex order forced van der Pol oscillator. The complex derivative Dα±jβ, with α, β ∈ R+ is a generalization of the concept of integer derivative, where α = 1, β = 0. We compute amplitude and period values of the periodic solutions of the complex order forced van der Pol oscillator, for variation of distinct parameters such as forcing frequency, forcing amplitude and parameters α and β. We find interesting quasi-periodic motion for certain values of the forcing frequency. This type of behaviour is seen in the continuous forced van der Pol oscillator.N/

Satisfaction with life in individuals with a lower limb amputation: The importance of active coping and acceptance

The aim of this study was to analyze the relationship between sociodemographic/clinical characteristics, coping strategies and satisfaction with life in individuals with lower limb amputation. Sixty-three individuals with a lower limb amputation due to Diabetes and Peripheral Vascular Disease participated in the study and answered measures of coping strategies and satisfaction with life. Findings revealed high dissatisfaction with life. Acceptance and active coping were the most used coping strategies. Satisfaction with life was positively associated with active and planning coping, religion, acceptance and humour. There were differences in coping strategies according to gender, age, marital status, presence of residual limb pain, prosthesis use and mobility level. Results emphasize the differential role of coping strategies, for each individual. Psychosocial interventions need to take into consideration coping strategies during the process of rehabilitation and be specific regarding individuals` sociodemographic and clinical characteristics. This study may help design interventions that answer individuals with lower limb amputations given that coping strategies are a valuable resource in the promotion of satisfaction with life.- (undefined

Pareto and Zipf laws for city size distribution

Pareto and Zipf distributions have been used in the modeling of distinct phenomena, namely in biology, demography, computer science, economics, amongst others. In this paper, it is presented a short review of applications of these distributions in city sizes.N/

Self-similarity in world economy

Self-similarity is a property of complex networks, commonly observed in many distinct areas of science. Many real networks are said to be ¸ Sscale-freeˇT since they show a power law behavior. In this paper, we focus in self-similarity of economical phenomena. For that purpose we analyze data and their corresponding statistical properties. We approximate data by trendlines, whose parameters are unequivocally related with each type of phenomenon.N/

Variação genética em um teste de procedências de Araucaria cunninghamii.

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