Restaurant closures during the COVID-19 pandemic: A descriptive analysis.

This paper analyzes restaurant closure patterns during the first year of the COVID-19 pandemic. Using establishment-level data from Yelp and SafeGraph, I describe restaurant and location characteristics related to the closure decisions. Lower-rated restaurants and restaurants located closer to the city center were more likely to close in 2020.

Chiral Waveguide Optomechanics: First Order Quantum Phase Transitions with Z_{3} Symmetry Breaking.

We present a direct mapping between the quantum optomechanical problem of the atoms harmonically trapped in the vicinity of a chiral waveguide and a generalized quantum Rabi model, and we discuss the analogy between the self-organization of atomic chains in photonic structures and Dicke-like quantum phase transitions in the ultrastrong coupling regime. We extend the class of the superradiant phase transitions for the systems possessing Z_{3} rather than parity Z_{2} symmetry and demonstrate the emergence of the multicomponent Schrödinger-cat ground states in these systems.

[Is the N-terminal pro-B-type natriuretic peptide a predictor of cardiovascular events in hemodialysis patients?].

Aim To evaluate the role of N-terminal pro-hormone brain natriuretic peptide (NT-proBNP) as a predictor of cardiovascular events (CVE) in patients receiving programmed hemodialysis (PHD).Material and methods This study included 74 patients (men, 64.8 %) older than 18 years receiving PHD.