National Research University – Higher School of Economics

About: National Research University – Higher School of Economics is a education organization based out in Moscow, Russia. It is known for research contribution in the topics: Population & Computer science. The organization has 12873 authors who have published 23376 publications receiving 256396 citations.

Impact of the Injection Protocol on an Impurity's Stationary State

Abstract: We examine stationary-state properties of an impurity particle injected into a one-dimensional quantum gas. We show that the value of the impurity's end velocity lies between zero and the speed of sound in the gas and is determined by the injection protocol. This way, the impurity's constant motion is a dynamically emergent phenomenon whose description goes beyond accounting for the kinematic constraints of the Landau approach to superfluidity. We provide exact analytic results in the thermodynamic limit and perform finite-size numerical simulations to demonstrate that the predicted phenomena are within the reach of the ultracold gas experiments.

Macro- and microstructural changes in cosmonauts' brains after long-duration spaceflight.

Abstract: Long-duration spaceflight causes widespread physiological changes, although its effect on brain structure remains poorly understood. In this work, we acquired diffusion magnetic resonance imaging to investigate alterations of white matter (WM), gray matter (GM), and cerebrospinal fluid (CSF) compositions in each voxel, before, shortly after, and 7 months after long-duration spaceflight. We found increased WM in the cerebellum after spaceflight, providing the first clear evidence of sensorimotor neuroplasticity. At the region of interest level, this increase persisted 7 months after return to Earth. We also observe a widespread redistribution of CSF, with concomitant changes in the voxel fractions of adjacent GM. We show that these GM changes are the result of morphological changes rather than net tissue loss, which remained unclear from previous studies. Our study provides evidence of spaceflight-induced neuroplasticity to adapt motor strategies in space and evidence of fluid shift–induced mechanical changes in the brain.

The evolving Semashko model of primary health care: the case of the Russian Federation.

Abstract: This paper addresses the major developments in primary care in the Russian Federation under the evolving Semashko model. The overview of the original model and its current version indicates some positive characteristics, including the financial accessibility of care, focus on prevention, patient lists, and gatekeeping by primary-care providers. However, in practice these characteristics do not work according to expectations. The current primary-care system is inefficient and has low quality of care by international standards. The major reasons for the gap between the positive characteristics of the model and the actual developments are discussed, including the excessive specialization of primary care, weak health-workforce policy, the delay in the shift to a general practitioner model, and the dominance of the multispecialty polyclinic, which does not prove advantageous over alternative models. Government attempts to strengthen primary care cover a wide range of activities, but they are not enough to improve the system and cannot do this without more a systematic and consistent approach. The major lesson learnt is that the lack of generalists and coordination cannot be compensated for by the growing number of specialists in the staff of primary-care facilities. Big multispecialty settings (polyclinics in the Russian context) have the potential for more integrated service delivery, but to make it happen, action is needed. Simple decisions, like merging polyclinics, do not help much.