The inverse-square interaction phase diagram: unitarity in the bosonic ground state

Ground-state properties of bosons interacting via inverse square potential (three dimensional Calogero-Sutherland model) are analyzed. A number of quantities scale with the density and can be naturally expressed in units of the Fermi energy and Fermi momentum multiplied by a dimensionless constant (Bertsch parameter). Two analytical approaches are developed: the Bogoliubov theory for weak and the harmonic approximation (HA) for strong interactions. Diffusion Monte Carlo method is used to obtain the ground-state properties in a non-perturbative manner. We report the dependence of the Bertsch parameter on the interaction strength and construct a Pad\'e approximant which fits the numerical data and reproduces correctly the asymptotic limits of weak and strong interactions. We find good agreement with beyond-mean field theory for the energy and the condensate fraction. The pair distribution function and the static structure factor are reported for a number of characteristic interactions. We demonstrate that the system experiences a gas-solid phase transition as a function of the dimensionless interaction strength. A peculiarity of the system is that by changing the density it is not possible to induce the phase transition. We show that the low-lying excitation spectrum contains plasmons in both phases, in agreement with the Bogoliubov and HA theories. Finally, we argue that this model can be interpreted as a realization of the unitary limit of a Bose system with the advantage that the system stays in the genuine ground state contrarily to the metastable state realized in experiments with short-range Bose gases.Comment: published version, 27 pages, 6 figures, 1 tabl

Lamb Shift of Laser-Dressed Atomic States

We discuss radiative corrections to an atomic two-level system subject to an intense driving laser field. It is shown that the Lamb shift of the laser-dressed states, which are the natural state basis of the combined atom-laser system, cannot be explained in terms of the Lamb shift received by the atomic bare states which is usually observed in spectroscopic experiments. In the final part, we propose an experimental scheme to measure these corrections based on the incoherent resonance fluorescence spectrum of the driven atom.Comment: 4 pages, 1 figure, submitted for publicatio

Hospital Stage of Myocardial Infarction Treatment in 13 Regions of Russian Federation by Results of the International Research

Aim. To describe the characteristics of the patient with MI who is admitted to a hospital and to characterize the main diagnostic and treatment interventions in clinic. Material and methods. This study is observational and the part of big international project. It includes a representative sample of patients with MI admitted to 16 clinics in 13 regions of Russian Federation (Arkhangelsk region, Belgorod region, Bryansk region, Tver region, Saratov region, Rostov region, Samara region, the Republic of Tatarstan, Perm region, Tyumen region, Khanty-Mansiysk Autonomous district, Kemerovo region, Altai region). Patients were selected at random from among those experiencing a MI that were alive on the next morning after hospitalization. Enrollment took place from June 2015 to August 2016. Results. Of 1,128 patients included in the study, 872 were male (77.3%) and 256 females. 21.4% of patients had a previous MI, 8.3% had undergone PCI, and 2.2% CABG. Turning to cardiovascular risk factors, 46.2% of patients smoked prior to hospitalization, 34.6% were obese and 52.1% had a high cholesterol level. Only 40.0% of patients had no contact with the health care system within 12 months before the MI. Every fourth patient (25.1%) had undergone dispensarisation within 12 months before MI, women significantly often than men (33.5% and 22.6%, p < 0.001). Initial revascularization was performed in 73.2% of patients, PCI was the initial revascularization attempt in 49.4% of patients, and PCI with stenting in 46.7%. Conclusion. Patient with a MI in Russian clinics is likely to have had a history of cardiovascular disease, and to have regular contact with the health care system within 12 months before the development of cardiovascular event. We demonstrated the high rates of appropriate MI treatment, without significant gender and age difference (except for thrombolysis), however, there is a reserve for increasing the proportion of patients who are undergoing revascularization

Scanning Electron Microscopy Study of Drilling Cuttings in Tomsk Oblast Sites

The research is focused on determining mineralogical composition of drilling cuttings by scanning electron microscope as well as imaging the sample surface of high resolution that allows studying the structural characteristics of the site. In addition, a number of other techniques permit obtaining information on chemical composition of sample in near-surface layers. The study in drilling cuttings by means of scanning microscopy has revealed the presence of titanium, iron, zirconium oxides, iron sulphide, barium sulphate. The former is a mineral that concentrates rare-earth elements, presumably monocyte, as well as uranium silicate, etc. The results obtained confirm the data of previous X-ray structural analysis, i.e. the study samples consist of alumosilicate matrix. Apart from silicon and aluminium oxides, the matrix includes such elements as Na, K, Mg. Such a composition corresponds to rock-forming minerals: quartz, albite, microcline, clinochlore, muscovite, anorthoclase

Анализ влияния конфигурации приемо-передающих позиций распределенной антенной системы со слабонаправленными антеннами на потенциальную точность измерения параметров цели

The article proposal is to clarify the operating area of MIMO radar systems taking into consideration the requirements for the algorithms of signal processing. It offers to consider separately the spatially coherent systems operating in the far field that corresponds to the appropriate Fraunhofer’s boundary for antenna with the aperture corresponding to the system base and the spatially coherent systems where a transition is acceptable from the vector representation of the speed to the radial speed directed toward the center of the system. To analyze the influence of transceivers configuration on the system potential accuracy the paper offers to use a Krammer-Rao inequality- based method.A justification and refinement of concept of the far field for a distributed antenna system are given. Under far field for a distributed antenna system the authors propose to consider such a field with such a range where Doppler frequency resolution doesn’t allow resolving the signal from one transmitter in any of two maximally spaced receivers.The article presents potential accuracy estimates of distributed antenna system, which allow us to draw the following conclusions:- MIMO radar with omnidirectional antennas can be analyzed using a proposed method based on Krammer-Rao inequality;- the maximum distant positions from the center of the system have the greatest influence on the potential measuring accuracy of the MIMO radar coordinates;- generated resolution elements for MIMO radar are similar to multiposition radar system in the area where distance from the center of the system does not exceed several system bases;- resolution elements for MIMO radar with increasing distance from system center tend to increase their range size and at certain ranges can be regarded as narrow (micro) beams formed to be similar in structure to the narrow beams of radar interferometer.Приводятся результаты анализа влияния взаимного расположения приемо-передающих позиций многопозиционного пространственно-когерентного радиолокационного комплекса со слабонаправленными антенными системами на точность оценки положения цели. Приводится методика оценки точности положения цели для пространственно-когерентного радиолокационного комплекса. DOI: 10.7463/rdopt.0515.077780

Resonance fluorescence and Autler-Townes spectra of a two-level atom driven by two fields of equal frequencies

We study the effects of driving a two-level atom by two intense field modes that have equal frequencies but are otherwise distinguishable; the intensity of one mode is also assumed to be greater than that of the other. We calculate first the dressed states of the system, and then its resonance fluorescence and Autler-Townes absorption spectra. We find that the energy spectrum of the doubly dressed atom consists of a ladder of doublet continua. These continua manifest themselves in the fluorescence spectrum, where they produce continua at the positions of the Mellow sideband frequencies omega(L)+/-2 Omega of the strong field, and in the Autler-Townes absorption spectrum, which becomes a two-continuum doublet

Оценка внесосудистой воды легких во время обширных торакальных вмешательств и в послеоперационном периоде

Background. Postoperative lung injury is a cause of most fatal outcomes after extensive lung resections. Death rates due to postpneumonectomy pulmonary edema have remained unchanged within the past 20 years and are currently tending to 100%. Objective: to make prolonged lung edema monitoring in patients after extensive thoracic interventions. Subjects and methods. The observational study covered 27 patients who had undergone pneumonectomy (PE) (n=16) or lung resection (n=11). Invasive monitoring by the PiCCOplus system was performed to examine the systemic and pulmonary hemodynamics of all the patients during surgery and within 48 postoperative hours. Results. PE rather than lung resection was accompanied by a significant reduction in the extravascular lung water index (EVLWI). Most patients who had undergone PE were found to have a subclinical increase in EVLWI 36-48 hours after termination of the intervention. Conclusion. In this observational clinical study, isolated thermodilution showed an immediate decrease in EVLWI after PE and its increase at 36—48 postoperative hours. Lobar or segmental interventions failed to cause significant changes in EVLWI in the perioperative period. Key words: pneumonectomy, lung resection, lung edema, extravascular lung water, acute lung injury.Цель исследования . Послеоперационное повреждение легких является причиной большинства смертельных исходов после обширных резекционных легочных вмешательств. Летальность вследствие постпневмонэктомичес-кого отека легких остается неизменной на протяжении последних 20 лет и стремится к 100%. Целью данного исследования было проведение продленного мониторинга отека легких у пациентов после обширных торакальных вмешательств. Материал и методы. В обсервационное исследование включено 27 пациентов, которым была выполнена пневмонэктомия (n=16) или резекция легких (n=11). Всем больным проводили инвазивный мониторинг системной и легочной гемодинамики с использованием системы PiCCOplus во время вмешательства и на протяжении 48 часов послеоперационного периода. Результаты. Пневмонэктомия (ПЭ), но не резекция легких, сопровождалась достоверным снижением индекса внесосудистой воды легких (ИВСВЛ). Спустя 36—48 часов после окончания вмешательства у большинства пациентов, перенесших ПЭ, было выявлено субклиническое повышение ИВСВЛ. Заключение. В представленном обсервационном клиническом исследовании изолированная термодилюция показала немедленное уменьшение ИВСВЛ после ПЭ и его повышение к 36-48 часам послеоперационного периода. Долевые или сегментарные вмешательства не вели к значимым изменениям ИВСВЛ в пери-операционном периоде. Ключевые слова: пневмонэктомия, резекция легких, отек легких, внесосудистая вода легких, острое повреждение легких

Пути снижения госпитальной летальности у пациентов с кардиогенным шоком при остром коронарном синдроме

Objective: to analyze a medical care system for acute coronary syndrome (ACS) in a large city in terms of in-hospital cardiogenic shock mortality risk management. Materials and methods. The health care facility management system for a risk for cardiogenic shock (CS) and its poor outcome (death) was a methodological basis of this study. The information from case histories of ACS patients consecutively admitted to the Kemerovo Cardiology Dispensary (Kemerovo, Russia) in the period 2006 to 2011 was used to develop an electronic database. Sampling included 19281 patients with ACS, 6537 with myocardial infarction (MI), 493 with CS. Results and discussion. The medical care system for patients with ACS encompasses an emergency team (a prehospital level), a specialized cardiac hospital (an in-hospital level) with a multistage therapeutic and diagnostic process in relation the severity of a patient’s status. The management is based on the principle of continuity of care, by applying the well-defined activity algorithms through valid information exchange and risk stratification for poor outcomes of ACS. An antishock team working just in the admission unit of a hospital was set up to treat high CS risk patients. A systems approach allowed the strategy of early specialized medical care to be developed with a priority of primary percutaneous coronary interventions (PCI) as reperfusion therapy in patients with ST-elevation MI. In 2006-2011, every three patients with suspected ACS had verified MI that was com_ plicated by CS in 7.5%. In the CS group, the in-hospital mortality rates totaled 88.0% of cases; that after primary Адрес для корреспонденции (Correspondence to): PCI was 62.2%. In the examined period, the introduction of innovation clinical and organizational approaches provided a reduction in this indicator by 17.6 and 37.5%, respectively. Conclusion. The efficiency of risk management for CS and its poor outcomes in patients with ACS is determined by the unique principles of medical care rendering at all levels on the basis of risk management methodology.Цель исследования . Анализ системы оказания медицинской помощи при остром коронарном синдроме (ОКС) в крупном городе с точки зрения управления риском госпитальной летальности от кардиогенного шока (КШ). Материалы и методы. Основой исследования выступает система менеджмента медицинской организации в отношении риска КШ и его неблагоприятного исхода (смерть). На основе сведений из историй болезни пациентов с ОКС, поступивших последовательно в Кемеровский кардиологический диспансер (г. Кемерово, Россия) в период с 2006 по 2011 год сформирована электронная база данных. Способ формирования выборки — сплошной (с ОКС — 19281, с инфарктом миокарда (ИМ) — 6537, кардиогенным шоком (КШ) — 493 пациентов). Результаты и обсуждение. В системе оказания помощи пациентам с ОКС участвуют скорая медицинская помощь (догоспитальный уровень), специализированный кардиологический стационар (госпитальный уровень) с многоэтапным лечебно-диагностическим процессом по степени тяжести состояния пациента. Управление осуществляется по принципу преемственности помощи, с использованием четких алгоритмов деятельности на основе достоверного информационного обмена, стратификации риска неблагоприятных исходов ОКС. Для лечения пациентов с высоким риском КШ создана противошоковая бригада, работающая с этапа приемного отделения стационара. Системный подход позволил развивать стратегию раннего оказания специализированной медицинской помощи с приоритетом первичных чрескожных коронарных вмешательств (ЧКВ), как метода реперфузионной терапии у пациентов с ИМпST. За 2006—2011 гг. у каждого третьего пациента с подозрением на ОКС верифицирован ИМ, который у 7,5% осложнился КШ. Госпитальная летальность в целом в группе КШ составила 88,0% случаев, при проведении первичного ЧКВ — 62,2%. Внедрение инновационных клинико-ор-ганизационных подходов обеспечило за исследуемый период снижение показателя на 17,6 и 37,5% соответственно. Выводы. Эффективность управления риском развития КШ и его неблагоприятных исходов у пациентов с ОКС определяется едиными принципами процесса оказания медицинской помощи на всех уровнях на основе методологии риск-менеджмента. Ключевые слова: острый коронарный синдром, кардиогенный шок, риск-менеджмент