Superfluidity of flexible chains of polar molecules

We study properties of quantum chains in a gas of polar bosonic molecules confined in a stack of N identical one- and two- dimensional optical lattice layers, with molecular dipole moments aligned perpendicularly to the layers. Quantum Monte Carlo simulations of a single chain (formed by a single molecule on each layer) reveal its quantum roughening transition. The case of finite in-layer density of molecules is studied within the framework of the J-current model approximation, and it is found that N-independent molecular superfluid phase can undergo a quantum phase transition to a rough chain superfluid. A theorem is proven that no superfluidity of chains with length shorter than N is possible. The scheme for detecting chain formation is proposed.Comment: Submitted to Proceedings of the QFS2010 satellite conference "Cold Gases meet Many-Body Theory", Grenoble, August 7, 2010. This is the expanded version of V.

Connection between body mass index, relative body mass index and bronchial patency indicators in children with bronchial asthma

Objective of the study: To study the relationship between nutritional status parameters and spirometric parameters reflecting bronchial patency in children with bronchial asthma (BA). Materials and methods of research: A retrospective non-randomized single-center comparative study of 417 children, 297 boys (71,2%) and 120 girls (28,8%), age 10,5 [10,2; 10,9] years with atopic BA. All children underwent spirometry and anthropometry. Results: An increase in body weight from underweight to obesity was accompanied by a decrease in the FEV1/FVC ratio from 80,4 [48,8; 97,9]% to 73,7 [47,4; 88,1]%, p=0,003, MEF 25% (% pred) from 70,9 [19,4; 171,5]% to 55,1 [20,2; 110,0]%, p=0,003 and FEF 25-75 (% pred) from 79,2 [28,6; 173,6]% to 65,9 [24,8; 103,5]%, p=0,02; at the same time, there is an increase in FVC% pred from 104,88±17,26 to 112,13±16,22%, р=0,01, which may be associated with the phenomenon of dysanapsis. The body mass index (BMI) and relative BMI values negatively correlate with the FEV1/FVC index (r=-0,20 and r=-0,19, respectively, p=0,0001). Similar data for the general cohort was collected in the cohort of boys. Conclusion: Indicators of nutritional status, as well as spirometric indicators, can be important components of an objective assessment of the condition of children with asthma for individual effective therapy of the disease. © 2021, Pediatria Ltd.. All rights reserved

The experimental facility for the Search for Hidden Particles at the CERN SPS

The Search for Hidden Particles (SHiP) Collaboration has shown that the CERN SPS accelerator with its 400 GeV/c proton beam offers a unique opportunity to explore the Hidden Sector [1-3]. The proposed experiment is an intensity frontier experiment which is capable of searching for hidden particles through both visible decays and through scattering signatures from recoil of electrons or nuclei. The high-intensity experimental facility developed by the SHiP Collaboration is based on a number of key features and developments which provide the possibility of probing a large part of the parameter space for a wide range of models with light long-lived super-weakly interacting particles with masses up to (10) GeV/c2 in an environment of extremely clean background conditions. This paper describes the proposal for the experimental facility together with the most important feasibility studies. The paper focuses on the challenging new ideas behind the beam extraction and beam delivery, the proton beam dump, and the suppression of beam-induced background