Luttinger liquid superlattices: realization of gapless insulating phases

We investigate Luttinger Liquid superlattices, a periodic structure composed of two kinds of one-dimensional systems of interacting electrons. We calculate several properties of the low-energy sector: the effective charge and spin velocities, the compressibility, various correlation functions, the Landauer conductance and the Drude weight. The low-energy properties are subsumed into effective parameters, much like homogeneous one-dimensional systems. A generic result is the weighted average nature of these parameters, in proportion to the spatial extent of the underlying subunits, pointing to the possibility of ``engineered'' structures. As a specific realization, we consider a one-dimensional Hubbard superlattice, which consists of a periodic arrangement of two long Hubbard chains with different coupling constants and different hopping amplitudes. This system exhibits a rich phase diagram with several phases, both metallic and insulating. We have found that gapless insulating phases are present over a wide range of parameters.Comment: 16 pages, 15 figures, RevTeX

"The Keynesian Roots of Stock-flow Consistent Macroeconomic Models: Peering Over the Edge of the Short Period"

This paper argues that institutionally rich stock-flow consistent models—that is, models in which economic agents are identified with the main social categories/institutional sectors of actual capitalist economies, the short period behavior of these agents is thoroughly described, and the "period by period" balance sheet dynamics implied by the latter is consistently modeled—are (1) perfectly compatible with John Maynard Keynes's theoretical views, (2) the ideal tool for rigorous post-Keynesian analyses of the medium run, and (3) therefore crucial to the consolidation of the broad post-Keynesian research program.

"Revisiting (and Connecting) Marglin-Bhaduri and Minsky--An SFC Look at Financialization and Profit-led Growth"

Many heterodox strands of thought share both a concern with the study of different phases or growth regimes in the history of capitalism and the use of formal short-run models as an analytical tool. This text suggests that (1) this strategy is potentially misleading; (2) that the stock-flow consistent (SFC) approach, while providing a general framework that may facilitate the dialogue among those currents, is particularly well suited to all those who think that macroeconomic models may illuminate historical quests; and (3) that the main intuitions may be conveyed through the "benchmark" Post Keynesian SFC model presented by Dos Santos and Zezza (2008), dispensing with the complex computer simulations that are normally employed by SFC authors.

The 3 C´s model of Millennials brand awareness

With numbers estimated as high as 70 million, Generation Y (also known as the Millennials) is the fastest growing segment of today’s workforce. But they are also demanding consumers with characteristics firms ought to understand for better capture the value they may also be able to provide. This paper aims at understanding better what the millennials profile is in terms of buying behaviour and proposes a model for the development of millennial digital marketing strategies that can be useful both, to firms and academics, to anchor more efficient marketing strategies.info:eu-repo/semantics/publishedVersio

CORRELAÇÃO DA CIRCUNFERÊNCIA DO PESCOÇO COM FATORES DE RISCO CARDIOVASCULAR

Objective: to investigate the correlation of neck circumference with other anthropometric parameters, with blood pressure, capillary glycemia and with modifiable and non-modifiable risk factors present. Method: descriptive crosssectional study, with patients from a polyclinic, by applying a semi-structured questionnaire. Neck circumference was measured considering the natural position of the head, between cervical midpoint and anterior neck. Cardiovascular risk was determined by measurement of abdominal circumference and modifiable or non-modifiable risk factors. Results: positive correlations were found between neck circumference and muscle mass index, abdominal circumference, systolic blood pressure, capillary glycemia and age, besides identifying high cardiovascular risk in most male participants, with a tendency to be higher in individuals with hypertension, diabetes and dyslipidemias. Conclusion: neck circumference was significantly correlated with body mass index, abdominal circumference, systolic pressure, capillary glycemia and age. Descriptors: Cardiovascular Diseases. Obesity. Anthropometry. Neck. Risk FactorsObjetivo: investigar la correlación de la circunferencia del cuello con otros parámetros antropométricos, con la presión arterial, la glucemia capilar y con los factores de riesgo modificables y no modificables presentes. Método: estudio descriptivo transversal, con pacientes de una policlínica, mediante la aplicación de un cuestionario semiestructurado. Circunferencia del cuello medida considerando la posición natural de la cabeza, entre el punto medio cervical y el cuello anterior. Riesgo cardiovascular determinado por la medición de la circunferencia abdominal y factores de riesgo modificables o no modificables. Resultados: se encontraron correlaciones positivas entre la circunferencia del cuello y el índice de masa muscular, la circunferencia abdominal, la presión arterial sistólica, la glucemia capilar y la edad, además de haber sido identificado un alto riesgo cardiovascular en la mayoría de los participantes masculinos, con tendencia a ser mayor en individuos con hipertensión, diabetes y dislipidemias. Conclusión: la circunferencia del cuello se correlacionó significativamente con el índice de masa corporal, la circunferencia abdominal, la presión sistólica, la glucemia capilar y la edad. Descriptores: Enfermedades Cardiovasculares. Obesidad. Antropometría. Cuello. Factores de Riesgo.Objetivo: investigar a correlação da circunferência do pescoço com outros parâmetros antropométricos, com a pressão arterial, com a glicemia capilar e com fatores de risco modificáveis e não modificáveis presentes. Método: estudo transversal descritivo, com pacientes de uma policlínica, mediante aplicação de questionário semiestruturado. Circunferência do pescoço aferida considerando posição natural da cabeça, entre ponto médio cervical e do pescoço anterior. Risco cardiovascular determinado pela medida da circunferência abdominal e pelos fatores de risco modificáveis ou não modificáveis. Resultados: encontradas correlações positivas entre circunferência do pescoço e índice de massa muscular, circunferência abdominal, pressão arterial sistólica, glicemia capilar e idade, além de ter sido identificado alto risco cardiovascular na maioria dos participantes do sexo masculino, com tendência de medida ser maior em indivíduos com hipertensão, diabetes e dislipidemias. Conclusão: circunferência do pescoço correlacionou-se significativamente com índice de massa corpórea, circunferência abdominal, pressão sistólica, glicemia capilar e idade. Descritores: Doenças Cardiovasculares. Obesidade. Antropometria. Pescoço. Fatores de Risco

An Efficient FEM-SFEM Iterative Coupling Procedure for Elastodynamic Problems

In the present work, an efficient iterative coupling methodology between the Finite Element Method (FEM) and the Spectral Finite Element Method (SFEM) for the modeling of elastodynamic problems in the time domain is presented. The methodology allows the use of a nonconforming mesh at the interface between the subdomains, as well as independent time-step sizes within each subdomain. By minimizing a square error functional, an adaptive strategy for the relaxation parameter can be established in the iterative process, increasing the efficiency of the FEM-SFEM coupled analysis. Numerical simulations are presented in order to illustrate the accuracy and potentialities of the proposed methodology.Publicado en: Mecánica Computacional vol. XXXV no.33Facultad de Ingenierí

Gobernanza multinivel en China para el combate de la pandemia de COVID-19

This paper investigates China’s leadership over intergovernmental and private actions in tackling the COVID-19 pandemic and identifies sectors, levels, and roles played. The main argument is that successful control over the pandemic depends on effective and integrated leadership at different levels. The conceptual, theoretical, and analytical framework is given by the multi-level governance theory. Through a case study, the actions adopted in China (n = 374) were mapped from reports issued by the Chinese government, the World Health Organization, and media information. Content analysis was adopted to categorize data. Quantitative and qualitative findings show different roles of actors, as well as usefulness of the multi-level governance to provide fast and complex responses required during the pandemic. In the last section, the conclusion and recommendations for future research are addressed. The lack of studies on the application of multi-level governance in non-democratic regimes especially during a pandemic indicates the relevance and contribution of this study to the literature.info:eu-repo/semantics/publishedVersio