Possible Metastable State Triggered by Competition of Peierls State and Charge Ordered State

We examine a Peierls ground state and its competing metastable state in the one-dimensional quarter-filled Peierls-Hubbard model with the nearest-neighbor repulsive interaction V and the electron-phonon interaction (\propto 1/K with K being the elastic constant). From the mean-field approach, we obtain the phase diagram for the ground state on the plane of parameters V and K. The coexistent state of the spin-density wave and the charge ordering is realized for large V and K. With decreasing K, it exhibits a first-order phase transition to the unconventional Peierls state which is described by the bond-centered charge-density-wave state. In the large region of the Peierls ground state in the phase diagram, there exists the metastable state where the energy takes a local minimum with respect to the lattice distortion. On the basis of the present calculation, we discuss the photoinduced phase observed in the (EDO-TTF)_{2}PF_{6} compound.Comment: 8 pages, 9 figure

ЗАСТОСУВАННЯ ІНФОРМАЦІЙНО-АНАЛІТИЧНОЇ СИСТЕМИ „ФАРМЕКСПЕРТ СЕРВІС” ДЛЯ АНАЛІЗУ ЕКОНОМІЧНОЇ ЕФЕКТИВНОСТІ

The article aduces the main stages of pharmacoeconomic calculations to establish the size of the labour costs of employees’ pharmacies military medical service. To determine the cost-effectiveness of implementing IAS "FES", we used a methodical approach to evaluateg the use of new technological processes.Исследование посвящено определению факторов повышения экономической эффективности информационно-аналитической системы "Фармэксперт сервис" (ИАС "ФЭС"), прежде всего путем анализа трудозатрат ее применения. Сформулированы цели и методические подходы к определению основных функциональных требований к программному обеспечению, направленному на автоматизацию проведения фармакоэкономического исследования.Дослідження присвячено визначенню факторів підвищення економічної ефективності інформаційно-аналітичної системи «Фармексперт сервіс» (ІАС “ФЕС”), перш за все шляхом аналізу витрат праці від її застосування. Сформульовано цілі та методичні підходи визначення основних функціональних вимог до програмного забезпечення, спрямованого на автоматизацію проведення фармакоекономічного дослідження

EPIDEMIOLOGY OF PRIMARY HIP ARTHROPLASTY: REPORT FROM REGISTER OF VREDEN RUSSIAN RESEARCH INSTITUTE OF TRAUMATOLOGY AND ORTHOPEDICS

The   paper   presents   data   analysis   of  the   Hip   Arthroplasty  Register   of  Vreden   Russian   Research   Institute of Traumatology and Orthopedics, namely information on 37373 primary THA performed at the Vreden Institute and at several other orthopedic centers and 1200 hip replacements at other hospitals of St. Petersburg.There were 1.5 times more women in the studied cohort than men. A significant predominance of women with dysplastic osteoarthritis (72.4%) and rheumatoid arthritis (82.1%) was reported. A male predominance was noted in patients with secondary osteoarthritis (53.1%), post-traumatic changes of hip (61.0%) and osteonecrosis of the femoral head (68.6 %). The mean age of patients was 58.0±12.9 years (95% CI from 57.9 to 58.1, median 59 years). Age data of the study revealed that  patients were 10-12 years younger than reported in the national  arthroplasty registers of other countries.Total  hip arthroplasty was performed  in the  absolute  majority  of patients – 37295  cases (99,8%).  Uncemented implants  were used in 59.3% of cases, hybrid – in 29.6%, cemented – in 10.2%, reverse-hybrid – in 0.9% of all patients. The  most  common  bearing  used  was metal  on  crosslink  polyethylene, which  was applied  in 50.1% of all cases of arthroplasty. The  type  of fixation  of the  implant,  and  the  use of different  bearings  varied  in different  age groups. The paper presents  not only the absolute  numbers  of the data, but also demonstrated the dynamics  of the changes in time starting from 2007.The  present  epidemiological  study  does not  claim the  absolute  completeness of the  presented data,  but  contains the  analysis of the  large number  of cases, comparable  with  follow-ups  of patients in some national  registers  of certain European countries. The authors  analyzed about  10% of all cases of hip replacements performed  on the territory of the Russian Federation in ten-year  period

Theoretical Aspects of Charge Ordering in Molecular Conductors

Theoretical studies on charge ordering phenomena in quarter-filled molecular (organic) conductors are reviewed. Extended Hubbard models including not only the on-site but also the inter-site Coulomb repulsion are constructed in a straightforward way from the crystal structures, which serve for individual study on each material as well as for their systematic understandings. In general the inter-site Coulomb interaction stabilizes Wigner crystal-type charge ordered states, where the charge localizes in an arranged manner avoiding each other, and can drive the system insulating. The variety in the lattice structures, represented by anisotropic networks in not only the electron hopping but also in the inter-site Coulomb repulsion, brings about diverse problems in low-dimensional strongly correlated systems. Competitions and/or co-existences between the charge ordered state and other states are discussed, such as metal, superconductor, and the dimer-type Mott insulating state which is another typical insulating state in molecular conductors. Interplay with magnetism, e.g., antiferromagnetic state and spin gapped state for example due to the spin-Peierls transition, is considered as well. Distinct situations are pointed out: influences of the coupling to the lattice degree of freedom and effects of geometrical frustration which exists in many molecular crystals. Some related topics, such as charge order in transition metal oxides and its role in new molecular conductors, are briefly remarked.Comment: 21 pages, 19 figures, to be published in J. Phys. Soc. Jpn. special issue on "Organic Conductors"; figs. 4 and 11 replaced with smaller sized fil

Ground state and finite temperature behavior of 1/4-filled band zigzag ladders

We consider the simplest example of lattice frustration in the 1/4-filled band, a one-dimensional chain with next-nearest neighbor interactions. For this zigzag ladder with electron-electron as well as electron-phonon interactions we present numerical results for ground state as well as thermodynamic properties. In this system the ground state bond distortion pattern is independent of electron-electron interaction strength. The spin gap in the ground state of the zigzag ladder increases with the degree of frustration. Unlike in one-dimension, where the spin-gap and charge ordering transitions can be distinct, we show that in the ladder they occur simultaneously. We discuss spin gap and charge ordering transitions in 1/4-filled materials with one, two, or three dimensional crystal structures. We show empirically that regardless of dimensionality the occurrence of simultaneous or distinct charge and magnetic transitions can be correlated with the ground state bond distortion pattern.Comment: 12 pages, 8 eps figure

The ART-XC telescope on board the SRG observatory

ART-XC (Astronomical Roentgen Telescope - X-ray Concentrator) is the hard X-ray instrument with grazing incidence imaging optics on board the Spektr-Roentgen-Gamma (SRG) observatory. The SRG observatory is the flagship astrophysical mission of the Russian Federal Space Program, which was successively launched into orbit around the second Lagrangian point (L2) of the Earth-Sun system with a Proton rocket from the Baikonur cosmodrome on 13 July 2019. The ART-XC telescope will provide the first ever true imaging all-sky survey performed with grazing incidence optics in the 4-30 keV energy band and will obtain the deepest and sharpest map of the sky in the energy range of 4-12 keV. Observations performed during the early calibration and performance verification phase as well as during the on-going all-sky survey that started on 12 Dec. 2019 have demonstrated that the in-flight characteristics of the ART-XC telescope are very close to expectations based on the results of ground calibrations. Upon completion of its 4-year all-sky survey, ART-XC is expected to detect ~5000 sources (~3000 active galactic nuclei, including heavily obscured ones, several hundred clusters of galaxies, ~1000 cataclysmic variables and other Galactic sources), and to provide a high-quality map of the Galactic background emission in the 4-12 keV energy band. ART-XC is also well suited for discovering transient X-ray sources. In this paper, we describe the telescope, results of its ground calibrations, major aspects of the mission, the in-flight performance of ART-XC and first scientific results.Comment: 19 pages, 30 figures, accepted for publication in Astronomy and Astrophysic

РОСТ И ПРОДУКЦИЯ КИВАНО В УСЛОВИЯХ ОТКРЫТОГО ГРУНТА НА ЮГЕ ЗАПАДНОЙ СИБИРИ

Kiwano plants, or horned cucumber (Cucumis metuliferus E. Mey ex Naudin) was grown in the open field in several experimental plots in the south of West Siberia (54,95025 N, 83,09763 E). Fruits production was correlated with night air temperature sum and soil organic matter content, reaching the maximum of 2.7 kg (fresh phytomass) per plant. Fruit size and some basic juice characteristics were similar to those of kiwano fruits grown elsewhere in the world. The vegetative phytomass grown was correlated with day air temperature sum, being practically independent of soil chemical properties. Thus kiwano can be recommended as a crop to be grown in the open field in the south of West Siberia and other regions of Russia with similar soil and environmental conditions.Растения кивано (Cucumis metuliferus E. Mey ex Naudin) выращивали в условиях открытого грунта в мелкоделяночном опыте на юге Западной Сибири (54,95025 с.ш., 83,09763 в.д.). Продуктивность растений была связана с суммой ночных температур воздуха и содержанием органического вещества в почве, достигнув максимальной величины 2,7 кг сырой массы с одного растения. Размеры плодов и основные химические свойства сока из них были близки к таковым, выращенных в других регионах мира. Развитие вегетативной фитомассы растений кивано было связано с суммой дневных температур воздуха за период вегетации и практически не зависело от агрохимических свойств почвы. Кивано можно с уверенностью рекомендовать для выращивания в условиях открытого грунта на юге Западной Сибири и других регионов страны со схожими почвенно-экологическими условиями

Impact of renal impairment on atrial fibrillation: ESC-EHRA EORP-AF Long-Term General Registry

Background: Atrial fibrillation (AF) and renal impairment share a bidirectional relationship with important pathophysiological interactions. We evaluated the impact of renal impairment in a contemporary cohort of patients with AF. Methods: We utilised the ESC-EHRA EORP-AF Long-Term General Registry. Outcomes were analysed according to renal function by CKD-EPI equation. The primary endpoint was a composite of thromboembolism, major bleeding, acute coronary syndrome and all-cause death. Secondary endpoints were each of these separately including ischaemic stroke, haemorrhagic event, intracranial haemorrhage, cardiovascular death and hospital admission. Results: A total of 9306 patients were included. The distribution of patients with no, mild, moderate and severe renal impairment at baseline were 16.9%, 49.3%, 30% and 3.8%, respectively. AF patients with impaired renal function were older, more likely to be females, had worse cardiac imaging parameters and multiple comorbidities. Among patients with an indication for anticoagulation, prescription of these agents was reduced in those with severe renal impairment, p <.001. Over 24 months, impaired renal function was associated with significantly greater incidence of the primary composite outcome and all secondary outcomes. Multivariable Cox regression analysis demonstrated an inverse relationship between eGFR and the primary outcome (HR 1.07 [95% CI, 1.01–1.14] per 10 ml/min/1.73 m2 decrease), that was most notable in patients with eGFR <30 ml/min/1.73 m2 (HR 2.21 [95% CI, 1.23–3.99] compared to eGFR ≥90 ml/min/1.73 m2). Conclusion: A significant proportion of patients with AF suffer from concomitant renal impairment which impacts their overall management. Furthermore, renal impairment is an independent predictor of major adverse events including thromboembolism, major bleeding, acute coronary syndrome and all-cause death in patients with AF