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  1. Article: ModInterv COVID-19: An online platform to monitor the evolution of epidemic curves.

    Brum, Arthur A / Vasconcelos, Giovani L / Duarte-Filho, Gerson C / Ospina, Raydonal / Almeida, Francisco A G / Macêdo, Antônio M S

    Applied soft computing

    2023  Volume 137, Page(s) 110159

    Abstract: We present the software ModInterv as an informatics tool to monitor, in an automated and user-friendly manner, the evolution and trend of COVID-19 epidemic curves, both for cases and deaths. The ModInterv software uses parametric generalized growth ... ...

    Abstract We present the software ModInterv as an informatics tool to monitor, in an automated and user-friendly manner, the evolution and trend of COVID-19 epidemic curves, both for cases and deaths. The ModInterv software uses parametric generalized growth models, together with LOWESS regression analysis, to fit epidemic curves with multiple waves of infections for countries around the world as well as for states and cities in Brazil and the USA. The software automatically accesses publicly available COVID-19 databases maintained by the Johns Hopkins University (for countries as well as states and cities in the USA) and the Federal University of Viçosa (for states and cities in Brazil). The richness of the implemented models lies in the possibility of quantitatively and reliably detecting the distinct acceleration regimes of the disease. We describe the backend structure of software as well as its practical use. The software helps the user not only to understand the current stage of the epidemic in a chosen location but also to make short term predictions as to how the curves may evolve. The app is freely available on the internet (http://fisica.ufpr.br/modinterv), thus making a sophisticated mathematical analysis of epidemic data readily accessible to any interested user.
    Language English
    Publishing date 2023-02-27
    Publishing country United States
    Document type Journal Article
    ISSN 1568-4946
    ISSN 1568-4946
    DOI 10.1016/j.asoc.2023.110159
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: ModInterv: An automated online software for modeling epidemics.

    Brum, Arthur A / Duarte-Filho, Gerson C / Ospina, Raydonal / Almeida, Francisco A G / Macêdo, Antônio M S / Vasconcelos, Giovani L

    Software impacts

    2022  Volume 14, Page(s) 100409

    Abstract: The COVID-19 pandemic has proven the importance of mathematical tools to understand the evolution of epidemic outbreaks and provide reliable information to the general public and health authorities. In this perspective, we have developed ModInterv, an ... ...

    Abstract The COVID-19 pandemic has proven the importance of mathematical tools to understand the evolution of epidemic outbreaks and provide reliable information to the general public and health authorities. In this perspective, we have developed ModInterv, an online software that applies growth models to monitor the evolution of the COVID-19 epidemic in locations chosen by the user among countries worldwide or states and cities in the USA or Brazil. This paper describes the software capabilities and its use both in recent research works and by technical committees assisting government authorities. Possible applications to other epidemics are also briefly discussed.
    Language English
    Publishing date 2022-08-13
    Publishing country Netherlands
    Document type Journal Article
    ISSN 2665-9638
    ISSN (online) 2665-9638
    DOI 10.1016/j.simpa.2022.100409
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Turbulence Hierarchy and Multifractality in the Integer Quantum Hall Transition.

    Barbosa, Anderson L R / de Lima, Tiago H V / González, Iván R R / Pessoa, Nathan L / Macêdo, Antônio M S / Vasconcelos, Giovani L

    Physical review letters

    2022  Volume 128, Issue 23, Page(s) 236803

    Abstract: We offer a new perspective on the problem of characterizing mesoscopic fluctuations in the interplateau regions of the integer quantum Hall transition. We found that longitudinal and transverse conductance fluctuations, generated by varying the external ... ...

    Abstract We offer a new perspective on the problem of characterizing mesoscopic fluctuations in the interplateau regions of the integer quantum Hall transition. We found that longitudinal and transverse conductance fluctuations, generated by varying the external magnetic field within a microscopic model, are multifractal and lead to distributions of conductance increments (magnetoconductance) with heavy tails (intermittency) and signatures of a hierarchical structure (cascade) in the corresponding stochastic process, akin to Kolmogorov's theory of fluid turbulence. We confirm this picture by interpreting the stochastic process of the conductance increments in the framework of H theory, which is a continuous-time stochastic approach that incorporates the basic features of Kolmogorov's theory. The multifractal analysis of the conductance "time series," combined with the H-theory formalism, provides strong support for the overall characterization of mesoscopic fluctuations in the quantum Hall transition as a multifractal stochastic phenomenon with multiscale hierarchy, intermittency, and cascade effects.
    Language English
    Publishing date 2022-06-24
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.128.236803
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Multiple waves of COVID-19: a pathway model approach.

    Vasconcelos, Giovani L / Pessoa, Nathan L / Silva, Natan B / Macêdo, Antônio M S / Brum, Arthur A / Ospina, Raydonal / Tirnakli, Ugur

    Nonlinear dynamics

    2022  Volume 111, Issue 7, Page(s) 6855–6872

    Abstract: A generalized pathway model, with time-dependent parameters, is applied to describe the mortality curves of the COVID-19 disease for several countries that exhibit multiple waves of infections. The pathway approach adopted here is formulated explicitly ... ...

    Abstract A generalized pathway model, with time-dependent parameters, is applied to describe the mortality curves of the COVID-19 disease for several countries that exhibit multiple waves of infections. The pathway approach adopted here is formulated explicitly in time, in the sense that the model's growth rate for the number of deaths or infections is written as an explicit function of time, rather than in terms of the cumulative quantity itself. This allows for a direct fit of the model to daily data (new deaths or new cases) without the need of any integration. The model is applied to COVID-19 mortality curves for ten selected countries and found to be in very good agreement with the data for all cases considered. From the fitted theoretical curves for a given location, relevant epidemiological information can be extracted, such as the starting and peak dates for each successive wave. It is argued that obtaining reliable estimates for such characteristic points is important for studying the effectiveness of interventions and the possible negative impact of their relaxation, as it allows for a direct comparison of the time of adoption/relaxation of control measures with the peaks and troughs of the epidemic curve.
    Language English
    Publishing date 2022-12-23
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2012600-1
    ISSN 1573-269X ; 0924-090X
    ISSN (online) 1573-269X
    ISSN 0924-090X
    DOI 10.1007/s11071-022-08179-8
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Generalization of the Schwarz-Christoffel mapping to multiply connected polygonal domains.

    Vasconcelos, Giovani L

    Proceedings. Mathematical, physical, and engineering sciences

    2011  Volume 470, Issue 2166, Page(s) 20130848

    Abstract: A generalization of the Schwarz-Christoffel mapping to multiply connected polygonal domains is obtained by making a combined use of two preimage domains, namely, a rectilinear slit domain and a bounded circular domain. The conformal mapping from the ... ...

    Abstract A generalization of the Schwarz-Christoffel mapping to multiply connected polygonal domains is obtained by making a combined use of two preimage domains, namely, a rectilinear slit domain and a bounded circular domain. The conformal mapping from the circular domain to the polygonal region is written as an indefinite integral whose integrand consists of a product of powers of the Schottky-Klein prime functions, which is the same irrespective of the preimage slit domain, and a prefactor function that depends on the choice of the rectilinear slit domain. A detailed derivation of the mapping formula is given for the case where the preimage slit domain is the upper half-plane with radial slits. Representation formulae for other canonical slit domains are also obtained but they are more cumbersome in that the prefactor function contains arbitrary parameters in the interior of the circular domain.
    Language English
    Publishing date 2011-02-28
    Publishing country England
    Document type Journal Article
    ZDB-ID 209241-4
    ISSN 1471-2946 ; 1364-5021 ; 0962-8444 ; 0080-4630 ; 0950-1207
    ISSN (online) 1471-2946
    ISSN 1364-5021 ; 0962-8444 ; 0080-4630 ; 0950-1207
    DOI 10.1098/rspa.2013.0848
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

    Z 46/95: Show issues

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  6. Article: Multiple steadily translating bubbles in a Hele-Shaw channel.

    Green, Christopher C / Vasconcelos, Giovani L

    Proceedings. Mathematical, physical, and engineering sciences

    2014  Volume 470, Issue 2163, Page(s) 20130698

    Abstract: Analytical solutions are constructed for an assembly of any finite number of bubbles in steady motion in a Hele-Shaw channel. The solutions are given in the form of a conformal mapping from a bounded multiply connected circular domain to the flow region ... ...

    Abstract Analytical solutions are constructed for an assembly of any finite number of bubbles in steady motion in a Hele-Shaw channel. The solutions are given in the form of a conformal mapping from a bounded multiply connected circular domain to the flow region exterior to the bubbles. The mapping is written as the sum of two analytic functions-corresponding to the complex potentials in the laboratory and co-moving frames-that map the circular domain onto respective degenerate polygonal domains. These functions are obtained using the generalized Schwarz-Christoffel formula for multiply connected domains in terms of the Schottky-Klein prime function. Our solutions are very general in that no symmetry assumption concerning the geometrical disposition of the bubbles is made. Several examples for various bubble configurations are discussed.
    Language English
    Publishing date 2014-02-13
    Publishing country England
    Document type Journal Article
    ZDB-ID 209241-4
    ISSN 1471-2946 ; 1364-5021 ; 0962-8444 ; 0080-4630 ; 0950-1207
    ISSN (online) 1471-2946
    ISSN 1364-5021 ; 0962-8444 ; 0080-4630 ; 0950-1207
    DOI 10.1098/rspa.2013.0698
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

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  7. Article ; Online: Power law behaviour in the saturation regime of fatality curves of the COVID-19 pandemic

    Giovani L. Vasconcelos / Antônio M. S. Macêdo / Gerson C. Duarte-Filho / Arthur A. Brum / Raydonal Ospina / Francisco A. G. Almeida

    Scientific Reports, Vol 11, Iss 1, Pp 1-

    2021  Volume 12

    Abstract: Abstract We apply a versatile growth model, whose growth rate is given by a generalised beta distribution, to describe the complex behaviour of the fatality curves of the COVID-19 disease for several countries in Europe and North America. We show that ... ...

    Abstract Abstract We apply a versatile growth model, whose growth rate is given by a generalised beta distribution, to describe the complex behaviour of the fatality curves of the COVID-19 disease for several countries in Europe and North America. We show that the COVID-19 epidemic curves not only may present a subexponential early growth but can also exhibit a similar subexponential (power-law) behaviour in the saturation regime. We argue that the power-law exponent of the latter regime, which measures how quickly the curve approaches the plateau, is directly related to control measures, in the sense that the less strict the control, the smaller the exponent and hence the slower the diseases progresses to its end. The power-law saturation uncovered here is an important result, because it signals to policymakers and health authorities that it is important to keep control measures for as long as possible, so as to avoid a slow, power-law ending of the disease. The slower the approach to the plateau, the longer the virus lingers on in the population, and the greater not only the final death toll but also the risk of a resurgence of infections.
    Keywords Medicine ; R ; Science ; Q
    Subject code 612
    Language English
    Publishing date 2021-02-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: Power law behaviour in the saturation regime of fatality curves of the COVID-19 pandemic.

    Vasconcelos, Giovani L / Macêdo, Antônio M S / Duarte-Filho, Gerson C / Brum, Arthur A / Ospina, Raydonal / Almeida, Francisco A G

    Scientific reports

    2021  Volume 11, Issue 1, Page(s) 4619

    Abstract: We apply a versatile growth model, whose growth rate is given by a generalised beta distribution, to describe the complex behaviour of the fatality curves of the COVID-19 disease for several countries in Europe and North America. We show that the COVID- ... ...

    Abstract We apply a versatile growth model, whose growth rate is given by a generalised beta distribution, to describe the complex behaviour of the fatality curves of the COVID-19 disease for several countries in Europe and North America. We show that the COVID-19 epidemic curves not only may present a subexponential early growth but can also exhibit a similar subexponential (power-law) behaviour in the saturation regime. We argue that the power-law exponent of the latter regime, which measures how quickly the curve approaches the plateau, is directly related to control measures, in the sense that the less strict the control, the smaller the exponent and hence the slower the diseases progresses to its end. The power-law saturation uncovered here is an important result, because it signals to policymakers and health authorities that it is important to keep control measures for as long as possible, so as to avoid a slow, power-law ending of the disease. The slower the approach to the plateau, the longer the virus lingers on in the population, and the greater not only the final death toll but also the risk of a resurgence of infections.
    MeSH term(s) Algorithms ; COVID-19/epidemiology ; COVID-19/mortality ; Europe/epidemiology ; Humans ; North America/epidemiology ; Pandemics ; SARS-CoV-2/isolation & purification
    Language English
    Publishing date 2021-02-25
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-021-84165-1
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Book ; Online: Turbulence Hierarchy and Multifractality in the Integer Quantum Hall Transition

    Barbosa, Anderson L. R. / de Lima, Tiago H. V. / Gonzalez, Ivan R. R. / Pessoa, Nathan L. / Macedo, Antonio M. S. / Vasconcelos, Giovani L.

    2022  

    Abstract: We offer a new perspective to the problem of characterizing mesoscopic fluctuations in the inter-plateau region of the integer quantum Hall transition. We found that longitudinal and transverse conductance fluctuations, generated by varying the external ... ...

    Abstract We offer a new perspective to the problem of characterizing mesoscopic fluctuations in the inter-plateau region of the integer quantum Hall transition. We found that longitudinal and transverse conductance fluctuations, generated by varying the external magnetic field within a microscopic model, are multifractal and lead to distributions of conductance increments (magnetoconductance) with heavy tails (intermittency) and signatures of a hierarchical structure (a cascade) in the corresponding stochastic process, akin to Kolmogorov's theory of fluid turbulence. We confirm this picture by interpreting the stochastic process of the conductance increments in the framework of H-theory, which is a continuous-time stochastic approach that incorporates the basic features of Kolmogorov's theory. The multifractal analysis of the conductance "time series," combined with the H-theory formalism provides, strong support for the overall characterization of mesoscopic fluctuations in the quantum Hall transition as a multifractal stochastic phenomenon with multiscale hierarchy, intermittency, and cascade effects.
    Keywords Condensed Matter - Mesoscale and Nanoscale Physics ; Condensed Matter - Statistical Mechanics
    Subject code 612
    Publishing date 2022-03-18
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Article: Comment on "Free surface Hele-Shaw flows around an obstacle: a random walk simulation".

    Vasconcelos, Giovani L

    Physical review. E, Statistical, nonlinear, and soft matter physics

    2007  Volume 76, Issue 3 Pt 2, Page(s) 038301; discussion 038302

    Abstract: It is shown that the computer simulations of Hele-Shaw flows around a wedge reported by Bogoyavlenskiy and Cotts [Phys. Rev. E 69, 016310 (2004)] do not reproduce with a high degree of accuracy the exact solutions known for this problem. ...

    Abstract It is shown that the computer simulations of Hele-Shaw flows around a wedge reported by Bogoyavlenskiy and Cotts [Phys. Rev. E 69, 016310 (2004)] do not reproduce with a high degree of accuracy the exact solutions known for this problem.
    Language English
    Publishing date 2007-09
    Publishing country United States
    Document type Comment ; Journal Article
    ISSN 1539-3755
    ISSN 1539-3755
    DOI 10.1103/PhysRevE.76.038301
    Database MEDical Literature Analysis and Retrieval System OnLINE

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