NMR and LDA evidence for spiral magnetic order in the chain cuprate LiCu2O2

We report on {6,7}Li nuclear magnetic resonance measurements of the spin-chain compound LiCu2O2 in the paramagnetic and magnetically ordered states. Below T about 24 K the NMR lineshape presents a clear signature of incommensurate (IC) static modulation of the local magnetic field consistent with an IC spiral modulation of the magnetic moments. {7}Li NMR reveals strong phason-like dynamical fluctuations extending well below 24 K. We hypothesize that a series of phase transitions at 24.2, 22.5, and 9 K reflects a "Devil's staircase" type behavior generic for IC systems. LDA based calculations of exchange integrals reveal a large in-chain frustration leading to a magnetical spiral.Comment: 4 pages, 4 figure

ПОБУДОВА МОДЕЛІ МІНІМІЗАЦІЇ ФІНАНСОВИХ РИЗИКІВ МАШИНОБУДІВНИХ ПІДПРИЄМСТВ

The article is based on a financial condition indicators system, which assesses the financial risk of the enterprise, and their grouping according to the nature of the impact on the enterprise financial position. The following financial risks groups have been identified: the inappropriate capital structure, inefficient financial activity, liquidity decline, ineffective operating activities, the imbalances in cash flows and ineffective investment activities risks. Each group of indicators is selected by the "center of gravity"one representative method to construct a model for assessing the financial risk in the enterprise level. It is determined that representative indicators in identifying the financial risk in an enterprise level are: coefficient of autonomy, coefficient of turnover of capital, absolute liquidity ratio, return on sales, net cash flow ratio, total return on investment.At the next stage of constructing a model for enterprise financial risks minimizing using expert method, representative indicators are measured according to their informativity for assessing financial risk at the enterprise. Taking into account the indicators significance, a machine-building enterprises assessment financial risk model was constructed on the basis of the enterprise financial risk level indicators-representatives additive convolution with their significance weight coefficients correction.The functional dependencies between the indicators are determined given the direct and inverse nature of the link between the indicators that characterize the machine-building enterprises financial risk, using correlation-regression analysis. An optimization model for machine-building enterprises financial risks minimizing was built on the principle of limiting financial risks. Optimizing the model means getting the maximum integral index value of the financial risk neutralization level. To this end, the Kuhn-Tucker theorem is used. As a result of model optimization it was revealed that from the point of view the financial risks at machine-building enterprises level minimizing, the optimum values of financial indicators are: for the coefficient of autonomy — 0.41; for the capital turnover coefficient — 31,0; for the coefficient of absolute liquidity — 0,45; for a profitability ratio of sales — 0,29; for the coefficient of sufficiency of net cash flow — 0,60; for the coefficient of total return on investment — 0,28. The established norms of financial indicators provide financial risk minimization at machine-building enterprises.Построены модель оценки уровня финансовых рисков на машиностроительных предприятиях, а также модель минимизации финансовых рисков машиностроительных предприятий. Определены оптимальные значения финансовых нормативов: коэффициента автономии, оборачиваемости капитала, абсолютной ликвидности, рентабельности продаж, достаточности чистого денежного потока, совокупной рентабельности инвестиций, соблюдение которых снизит уровень финансовых рисков на предприятиях, обеспечит эффективность их деятельности, финансовую устойчивость, ликвидность и платежеспособность.Побудовано систему показників фінансового стану, за якими оцінюється фінансовий ризик підприємства, та здійснено їхнє групування за характером впливу на фінансовий стан підприємства. Виділено такі групи фінансових ризиків: ризик нераціональної структури капіталу, ризик неефективної фінансової діяльності, ризик зниження ліквідності, ризик неефективної операційної діяльності, ризик незбалансованості грошових потоків і ризик неефективної інвестиційної діяльності. Для побудови моделі оцінки рівня фінансового ризику на підприємстві з кожної групи показників обрано по одному репрезентативному методом «центру ваг». Визначено, що репрезентативними показниками при ідентифікації рівня фінансового ризику на підприємстві є: коефіцієнт автономії, коефіцієнт оборотності капіталу, коефіцієнт абсолютної ліквідності, коефіцієнт рентабельності продажів, коефіцієнт достатності чистого грошового потоку, сукупна рентабельність інвестицій.На наступному етапі побудови моделі мінімізації фінансових ризиків підприємства з використанням експертного методу проранговано репрезентативні показники за їхнього інформативністю для оцінки фінансового ризику на підприємстві. З урахуванням значимості показників побудовано модель оцінки фінансових ризиків машинобудівних підприємств на основі адитивної згортки показників-репрезентантів рівня фінансового ризику підприємства з коригуванням на вагові коефіцієнти їхньої значимості.Ураховуючи прямий і обернений характер зв’язку між показниками, що характеризують рівень фінансового ризику машинобудівних підприємств, з використанням кореляційно-регресійного аналізу, визначено функціональні залежності між показниками. Побудовано оптимізаційну модель мінімізації фінансових ризиків машинобудівних підприємств, в основу якої закладено принцип лімітування фінансових ризиків. Оптимізація моделі означає отримання максимального значення інтегрального показника рівня нейтралізації фінансового ризику. Для цього використано теорему Куна — Таккера. У результаті оптимізації моделі виявлено, що з позиції мінімізації рівня фінансових ризиків на машинобудівних підприємствах оптимальними значеннями фінансових показників є: для коефіцієнта автономії — 0,41; для коефіцієнта оборотності капіталу — 31,0; для коефіцієнта абсолютної ліквідності — 0,45; для коефіцієнта рентабельності продажів — 0,29; для коефіцієнта достатності чистого грошового потоку — 0,60; для коефіцієнта сукупної рентабельності інвестицій — 0,28. Установлені нормативи фінансових показників забезпечують мінімізацію фінансового ризику на машинобудівних підприємствах

Behaviour of the Blazar CTA 102 during two giant outbursts

Blazar CTA 102 underwent exceptional optical and high-energy outbursts in 2012 and 2016-2017. We analyze its behaviour during these events, focusing on polarimetry as a tool that allows us to trace changes in the physical conditions and geometric configuration of the emission source close to the central black hole. We also use Fermi gamma-ray data in conjunction with optical photometry in an effort to localize the origin of the outbursts.AST-1615796 - Boston Universit

Changes of the body functions during long-term hypokinesia

Prolonged hypokinesis (100-170 days) studied in 2000 rats kept in cages limiting their mobility provoked considerable changes in the gaseous and energetic metabolism: an elevation of the total gaseous metabolism and of the rate of O2 requirement by the muscles (in the late periods of hypokinesis) and a change in the intensity of tissue respiration of the liver and myocardium. There also proved to be a reduction in the level of phosphorylation and separation of oxidative phosphorylation in the myocardium, liver, and partially in the skeletal muscle. Prolonged hypokinesia led to changes in tissue metabolism: a disturbance of development of the animals, a marked delay and an increase in the weight of the organism and the muscular system, and disturbances of the mineral and protein metabolism. Prolonged hypokinesis also lead to exhaustion of the hypothalamus-hypophysis-adrenal cortex system

External Electromagnetic Fields of a Slowly Rotating Magnetized Star with Gravitomagnetic Charge

We study Maxwell equations in the external background spacetime of a slowly rotating magnetized NUT star and find analytical solutions for the exterior electric fields after separating the equations of electric field into angular and radial parts in the lowest order approximation. The star is considered isolated and in vacuum, with dipolar magnetic field aligned with the axis of rotation. The contribution to the external electric field of star from the NUT charge is considered in detail.Comment: 6 pages, 2 figures, accepted for publication in Astrophysics and Space Scienc

Formation of future specialists’ communicative competence in language disciplines through modeling in game of professional situations

The relevance of the research problem driven by the necessity of formation of future specialists’ communicative competence as a component of professional competence with the aim of further professional mobility of graduates. The purpose of the article is to justify the possibility and necessity of formation of the required competencies in language disciplines at the University through the simulation of professional situations in practical classes. Leading method to the study of this problem is empirical, allowing to reveal the modeling capabilities in the game of professional situations and the use of games as forms of work in the classroom. Different variants of the experimental materials are developed and tested: game situations on a professional theme, tests, assignments, exercises, questions, reference work, selection of texts on pedagogy and education in our country and in the country of the target language. The article can be useful in practical work, to the teachers of language courses, not only at the universities, but also at schools, colleges, as well as interesting to all who are connected with professional pedagogical activity. © 2016 Sturikova et al

The Comparative Analysis of the Identification of Parasitic Fungi Races Affecting the Soil and Cultivated Vegetable and Cucurbits Crops in the Astrakhan Region

The habitat of plant pathogens does not remain constant and undergoes significant changes. Therefore, the reasons have to be revealed: the emergence of fungal infectious matter in the soil; the infection source and rate, which may have epiphytotic character under environmental factors of the disease development and consequently lead to the reduction in the yield of vegetable and cucurbits crops. As a result, it is necessary to conduct monitoring and objective diagnosis of the phytosanitary condition of the planting of vegetables and melons. In this case, the identification of parasitic fungi races of the Astrakhan region remains relevant and timely

Results of hydrological studies and channel analysis of the Ganges (Padma) River at the construction site of the “Rooppur” NPP

This work presents the results of research on channel processes in the Padma River (Republic of Bangladesh) at the construction site of the “Ruppur” Nuclear Power Plant (NPP). The fluvial characteristics of the Padma River were presented, including: the water outflow regime, characteristics of anthropogenic impact on the river outflow and assessment of the present state of the channel and floodplain. The research was conducted based on field expeditions, during which data on morphology, dynamics, hydrological and hydraulic conditions for the formation of the floodplain-channel complex were collected. Moreover, the water discharges and suspended sediments, as well as the longitudinal profiles of the water level and the channel morphology were measured. The presented research has shown that comprehensive and planned regulation of selected sections of rivers could lead to the channel stabilization and support the rational use of water resources for different purposes, e.g. power plants, municipal purposes, etc. Moreover, detailed research on channel deformation in selected areas indicated the major role of natural factors (geological structure, the type of sediments delivered to the river, vegetation cover, etc.) in the past and present fluvial processes

The ways to improve the biological and morphological parameters of young fattening pigs

Studies were carried out to find the new ways to improve the efficiency of iodine use for the young pigs. During the scientific and economic experiment it was found that bringing iodine to the physiological norm, in combination with introduction of 3% bentonite clay into the diets of young fattening pigs, provided a positive effect on the morphological composition of carcasses, slaughter parameters and meat quality of the pigs. So fattening the yelts with the diets with a physiological norm of iodine in combination with 3% bentonite clay allowed young pigs of the 3rd experimental group to reach a slaughter weight of 78.95 kg at the age of 8 months, which is 10.1% more than in the control group, and 4.2% and 2.5% more in comparison with the 1st and 2nd experimental groups. The slaughter yield in yelts of the 3rd experimental group increased by 2.43% (P<0.05) compared to the control group. The largest (30.17 cm2) area of the “rib eye” was recorded in the 3rd experimental group, which is 5.60% more than the control one, while the carcasses of pigs of the 3rd experimental group contained muscle tissue by 4.74% (P<0.05) more than the same in the control group. Analysis of the Musculus longissimus showed a significant increase in protein content in the 3rd experimental group by 1.22% compared to the control group (P<0.05). The protein-quality parameter was significantly higher in the muscle tissue of young pigs of the 3rd experimental group and amounted to 10.90 (P<0.05), which is 1.12% higher than in the muscle tissue of the control group yelts. The maximum content of oleic acid was found in the lard of animals of the 3rd experimental group — 49.59, which is 1.28% (P<0.05) higher than in the control group.