Diffusive dynamics and jamming in ensembles of robots with variable friction

In the present paper, we experimentally study the diffusive dynamics in ensembles of self-propelled and self-rotating bristle-bots. Considering the dependence of the system dynamics on the packing density of robots as well as on the friction between individual robots, we show that the friction slightly affects the diffusive dynamics but leads to a significant change in the jamming transition corresponding to the formation of rigid clusters of robots

Spin Resolution of the Electron-Gas Correlation Energy: Positive same-spin contribution

The negative correlation energy per particle of a uniform electron gas of density parameter $r_s$ and spin polarization $\zeta$ is well known, but its spin resolution into up-down, up-up, and down-down contributions is not. Widely-used estimates are incorrect, and hamper the development of reliable density functionals and pair distribution functions. For the spin resolution, we present interpolations between high- and low-density limits that agree with available Quantum Monte Carlo data. In the low-density limit for $\zeta = 0$, we find that the same-spin correlation energy is unexpectedly positive, and we explain why. We also estimate the up and down contributions to the kinetic energy of correlation.Comment: new version, to appear in PRB Rapid Communicatio

JUSTIFICATION OF CLINICAL AND MICROBIOLOGICAL APPROACHES TO PYELONEPHRITIS RECURRENCE TREATMENT AND PREVENTION IN CHILDREN

In the article, the authors highlight a frequent infant's pathology of urinary system — pyelonephritis. They provided new data on the most frequent causative agents of the illness, as well as on the factors, contributing to the development and chronization of the inflammatory process. The researchers give a detailed description of the diagnostics issues, treatment and prevention principles along with etiology and pathogenesis. The authors share their own experience in the given pathology therapy with the colleagues.Key words: urinary system infection, pyelonephritis, etiology, pathogenesis, diagnostics, clinical course, treatment, children

ОБОСНОВАНИЕ КЛИНИКО-МИКРОБИОЛОГИЧЕСКИХ ПОДХОДОВ К ЛЕЧЕНИЮ И ПРОФИЛАКТИКЕ РЕЦИДИВОВ ПИЕЛОНЕФРИТА У ДЕТЕЙ

In the article, the authors highlight a frequent infant's pathology of urinary system — pyelonephritis. They provided new data on the most frequent causative agents of the illness, as well as on the factors, contributing to the development and chronization of the inflammatory process. The researchers give a detailed description of the diagnostics issues, treatment and prevention principles along with etiology and pathogenesis. The authors share their own experience in the given pathology therapy with the colleagues.Key words: urinary system infection, pyelonephritis, etiology, pathogenesis, diagnostics, clinical course, treatment, children.В данной статье освещается часто встречающаяся в детском возрасте патология органов мочевой системы у детей – пиелонефрит. Представлены новые данные о наиболее частых возбудителях болезни, а также факторах, способствующих развитию и хронизции процесса. Наряду с этиологией и патогенезом подробно представлены вопросы диагностики и принципы лечения и профилактики. Авторы делятся с коллегами собственным опытом ведения детей с данной патологией. Ключевые слова: инфекция мочевых путей, пиелонефрит, этиология, патогенез, диагностика, клиника, лечение, дети. (Педиатрическая фармакология. – 2009;6(2):94-98