Impacts of the Covid-19 pandemic on the health of university students

The Covid-19 pandemic caused by the novel Sars-CoV-2 coronavirus, has resulted in millions of deaths and disruption to daily life across the globe. University students have been additionally affected by a sudden move to online learning, the closure of campuses and dramatic societal changes that have upended their experiences of higher education. Here we focus on the physical and mental health consequences of the pandemic for this population sector during 2020, and the interdependencies of these impacts. We survey the challenges for infection control on campuses and for monitoring the disease dynamics in student communities. Finally, we explore the psychological and mental health problems that have been exacerbated by the pandemic and evaluate the underlying factors that are most relevant to students

Electrostatic potential in a superconductor

The electrostatic potential in a superconductor is studied. To this end Bardeen's extension of the Ginzburg-Landau theory to low temperatures is used to derive three Ginzburg-Landau equations - the Maxwell equation for the vector potential, the Schroedinger equation for the wave function and the Poisson equation for the electrostatic potential. The electrostatic and the thermodynamic potential compensate each other to a great extent resulting into an effective potential acting on the superconducting condensate. For the Abrikosov vortex lattice in Niobium, numerical solutions are presented and the different contributions to the electrostatic potential and the related charge distribution are discussed.Comment: 19 pages, 11 figure

Spontaneous Hall effect in chiral p-wave superconductor

In a chiral superconductor with broken time-reversal symmetry a ``spontaneous Hall effect'' may be observed. We analyze this phenomenon by taking into account the surface properties of a chiral superconductor. We identify two main contributions to the spontaneous Hall effect. One contribution originates from the Bernoulli (or Lorentz) force from spontaneous currents running along the surfaces of the superconductor. The other contribution has a topological origin and is related to the intrinsic angular momentum of Cooper pairs. The latter can be described in terms of a Chern-Simons-like term in the low-energy field theory of the superconductor and has some similarities with the quantum Hall effect. The spontaneous Hall effect in a chiral superconductor is, however, non-universal. Our analysis is based on three approaches to the problem: a self-consistent solution of the Bogoliubov-de Gennes equation, a generalized Ginzburg-Landau theory, and a hydrodynamic formulation. All three methods consistently lead to the same conclusion that the spontaneous Hall resistance of a two-dimensional superconducting Hall bar is of order h/(e k_F\lambda)^2, where k_F is the Fermi wave vector and \lambda is the London penetration depth; the Hall resistance is substantially suppressed from a quantum unit of resistance. Experimental issues in measuring this effect are briefly discussed.Comment: 22 pages including 12 figure

Drawings of very preterm-born children at 5 years of age: a first impression of cognitive and motor development?

INTRODUCTION: The aim of this study was to examine differences in drawing skills between very preterm and term children, and to determine whether very preterm children's cognitive and motor development is reflected in the draw-a-person test (DAP) at age 5. Seventy-two very preterm children (birth weight <1,500 g and/or gestational age <32 weeks) and 60 term children at 5 years of age were compared on the DAP. Cognitive and motor skills of the very preterm children had been assessed four times, at 1/2, 1, 2, and 5 years of age. Very preterm children showed a developmental delay in drawing ability. Structural equation modeling revealed a positive relation between both cognitive as well as motor development and the DAP. CONCLUSION: The DAP could be a crude parameter for evaluating cognitive and motor deficits of very preterm children. A worrisome result should be followed by more standardized tests measuring cognitive and motor skill

Fiscaliteiten

Onlangs heeft het kabinet zijn standpunt bepaald inzake de voorstellen van de werkgroep ‘modernisering Successiewet’.1 2 Een van deze voorstellen betreft de vererving van ondernemingsvermogen c.q. aanmerkelijkbelangaandelen in een ondernemende vennootschap. Hieronder volgen de belangrijkste aandachtspunten

Vruchtgebruik van privé-vermogen in de inkomstenbelasting

Vruchtgebruik van privé-vermogen in de inkomstenbelastin