Calculations of the binding-energy differences for highly-charged Ho and Dy ions

The binding-energy differences for $^{163}\mathrm{Ho}^{q+}$ and $^{163}\mathrm{Dy}^{q+}$ ions with ionization degrees $q = 38$, $39$, and $40$ are calculated. The calculations are performed using the large-scale relativistic configuration-interaction and relativistic coupled-clusters methods. The contributions from quantum-electrodynamics, nuclear-recoil, and frequency-dependent Breit-interaction effects are taken into account. The final uncertainty does not exceed $1$ eV. Combining the obtained results with the binding-energy difference for neutral atoms calculated in [Savelyev et al., Phys. Rev. A 105, 012806 (2022)], we get the secondary differences of the ion-atom binding energies. These values can be used to evaluate the amount of energy released in the electron capture process in $^{163}\mathrm{Ho}$ atom (the $Q$ value), provided mass differences of highly charged ions $^{163}\mathrm{Ho}^{q+}$ and $^{163}\mathrm{Dy}^{q+}$ is known from experiment. The $Q$ value is required by experiments on the determination of the absolute scale of the electron neutrino mass by studying the beta-decay process.Comment: 4 pages, Jetp Lett. (2023

Low temperature sintering of electroexplosive nanopowders

By means of the methods of conductivity measurement and transmitting electron microscopy of sintered metal layer it has been shown that electroexplosive copper and zink powders are sintered with the formation of strong aggregates of corresponding compact metals. It has been also shown that sels-sintereing is a cause of below reduction of metal powder particle size obtained by the method of semiconductor electrical explosion

Ground state of superheavy elements with 120≤Z≤170120 \leq Z \leq 170: systematic study of the electron-correlation, Breit, and QED effects

For superheavy elements with atomic numbers $120\leq Z \leq 170$, the concept of the ground-state configuration is being reexamined. To this end, relativistic calculations of the electronic structure of the low-lying levels are carried out by means of the Dirac-Fock and configuration-interaction methods.The magnetic and retardation parts of the Breit interaction as well as the QED effects are taken into account. The influence of the relativistic, QED, and electron-electron correlation effects on the determination of the ground-state is analyzed

Short-term Mechanical Properties of Fe-Cr-Al-Si Alloys

The purpose of this work is to study the short-term mechanical properties of Fe-Cr-AlSi-based alloys. Within the framework of this work, alloys with a chromium content of 5 to 14 wt%, aluminum from 0 to 4 wt%, and silicon from 0 to 4 wt% are considered. The samples were tested in three different states - in the deformed state (cold rolling by 80%), and also after annealing at a temperature of 450 and 650 ∘C with a duration of 1000 h.As a result, the characteristics of the strength and plasticity of alloys in the deformed state, as well as after provoking annealing, were obtained. It is shown that embrittlement isn’t observed in the investigated composition region and annealing conditions, and the strength of the alloys is directly proportional to the sum of the alloying elements Al + Si. Keywords: cladding; VVER; tolerant fuel, ferrite steel; Corrosion-resistant steel, tensile strength, yield strengt

ГРАВІТАЦІЙНИЙ ПОТЕНЦІАЛ ВНУТРІШНЬОРЕГІОНАЛЬНОЇ ТОРГІВЛІ ВАЛЮТНИХ АЛЬЯНСІВ

The paper develops the concept of regional monetary integration, the framework of which includes three alternative exchange rate arrangements: currency board, full or parallel dollarization and currency union. Each of them has its own peculiarities of formation and development, its own advantages and disadvantages, but the common feature is unconditional exchange rate unification. The concept of currency proto-integration was introduced, which foresees the exchange of information on monetary initiatives between monetary authorities, consideration of counterparties’ interests to minimize risks or maximize common benefits in the field of monetary relations.In order to assess the effectiveness of monetary integration for the development of intra-regional trade flows, we use gravity modeling based on a sample of more than 105 thousand observations of bilateral trade flows within monetary integrational and proto-integrational alliances. Gravity model includes the parameters of the volumes of bilateral trade, gross domestic product, weighted distances between states and the system of dummy-variables for the determination of monetary associations, common language and borders between trading states. The applied gravity model demonstrates a fairly high level of certainty for South America, Europe, South and East Asia (R2 for them was 0.71, 0.63 and 0.54, respectively). It was established that among the monetary alliances, the integrational and proto-integrational structures of South America, Asia and Europe were most effective in the aspect of intensifying intraregional trade. Between the African monetary blocks, the regular growth of mutual trade was observed only in the West African Economic and Monetary Union, while the rest was characterized by reverse dependence.Развивается концепция региональной валютной интеграции, к каркасу которой включены три режимы валютного курса: валютный совет, полную или параллельную долларизацию и валютный союз. С целью оценки эффективности валютной интеграции для развития внутрирегиональных торговых потоков использовано гравитационное моделирование. Модель продемонстрировала достаточно высокий уровень достоверности для Южной Америки, Европы, Южной и Восточной Азии. Установлено, что среди валютных объединений наиболее эффективными в аспекте интенсификации внутренней торговли оказались интеграционные и протоинтеграционные структуры Южной Америки, Азии и Европы. Среди африканских валютных союзов регулярный прирост взаимной торговли наблюдался только в Западно-Африканском экономическом и валютном союзе.Розвинуто концепцію регіональної валютної інтеграції, до каркасу якої включено три режими валютного курсу: валютну раду, повну або паралельну доларизацію та валютний союз. Для кожного із них характерні свої особливості розвитку, переваги і недоліки, однак їхньою спільною рисою є безумовна валютно-курсова уніфікація. Введено поняття валютної протоінтеграції, яка включає разом із практикою здійснення регулярних трансакцій з іноземною валютою та обміну інформації щодо монетарних ініціатив також урахування інтересів контрагентів для мінімізації ризиків чи максимізації спільних вигід у сфері валютних відносин.Проведено аналіз ефективності валютної інтеграції для розвитку внутрішньорегіональних торговельних потоків. Дослідження базувалось на використанні методології гравітаційного моделювання торгівлі на основі вибірки із понад 105 тис. спостережень білатеральних торговельних потоків у рамках інтеграційних і протоінтеграційних валютних об’єднань. Гравітаційне моделювання враховувало параметри обсягів білатеральної торгівлі, валового внутрішнього продукту, зваженої відстані між державами і системи фіктивних змінних для врахування впливів членства у валютних об’єднаннях, наявності спільної мови та кордонів між торгуючими державами. Результати гравітаційного моделювання продемонстрували доволі високий рівень статистичної достовірності для Південної Америки, Європи, Південної та Східної Азії (R2 для них становить 0,71; 0,63 та 0,54 відповідно). Установлено, що серед валютних об’єднань найбільш ефективними в аспекті інтенсифікації внутрішньої торгівлі виявились інтеграційні та протоінтеграційні структури Південної Америки, Азії та Європи. В Африці регулярний приріст взаємної торгівлі спостерігався лише в Західно-Африканському економічному і валютному союзі, решта союзів характеризуються зворотною залежністю

Orbital collapse and dual states of the 5g5g electrons in superheavy elements

The problem of orbital collapse of the $5g$ and $6f$ electrons in atoms of superheavy elements (SHE) is considered. Previously, the presence of the orbital collapse was established for the $4f$ and $5f$ elements of the periodic table. Because of the large centrifugal term for the $f$ and $g$ electrons, the effective radial potential has two wells, one narrow and deep and the other wide but shallow. Depending on the external parameters, the electron can be either localized in the outer well with low binding energy and large average radius or in the inner one with higher energy and smaller radius. In this work, we demonstrate the existence of the orbital collapse for the $5g$ electrons when changing the total angular momentum $J$ of the atom. We also found that for some SHE elements, two different solutions of the same Dirac-Fock equations may coexist, with the $5g$ electron localized either in the inner or outer well. In both cases, the radial wave functions are nodeless. The problem of the dual-state coexistence is studied by the configuration-interaction method in the Dirac-Fock-Sturm orbital basis as well.Comment: 8 pages, 2 figure

Comparison of the results of measurements of white blood cells on four automated hematological analyzers

The aim of the study - to assess the consistency and interchangeability of various hematological analyzers for measuring white blood cellsЦель исследования – оценка согласованности и взаимозаменяемости различных гематологических анализаторов для измерения концентраций лейкоцито

Modeling and Forecasting the Removal of Biogenic Elements from Agricultural Lands Depending on the Soil Agrophysical Properties

Introduction. Environmental pollution prevention, including prevention of water bodies, with nutrients (nitrogen and phosphorus) when they are removed from agricultural lands with possible runoff is a topical problem that requires a timely solution. The studies have found that the removal of nutrients is a result of geochemical processes, fertilization, and other factors. In this regard, mathematical modeling of the process of removal of nutrients from agricultural lands and their possible entry into water bodies is an urgent task. Aim of the Study. The study is aimed at modeling and predicting the process of possible removal of nutrients from agricultural lands to water bodies. Materials and Methods. When conducting the study, there were used well-known modeling methods. They are the methods for calculating the removal of nutrients from agricultural objects into water bodies, based on the minimum amount of initial information for predicting the eutrophication of water bodies and agrochemical methods taking into account the structure and size of field and agricultural areas, crop yields, and removal nutrients with the harvest. Results. Based on an analysis of the literature and expert judgment, a list of the most significant indicators influencing the process of nitrogen and phosphorus removal was justified. There have been developed mathematical models to determine and predict the input of nutrients from agricultural lands to water bodies. There have been found significant indicators influencing the amount of input of nutrients, such as the amount of applied fertilizers, the volume of moisture, soil water capacity, field area, depth of cultivation, etc. There is given an example of calculating the amount of input of nutrients into water bodies with a rainfall intensity of 50 mm per hour. Discussion and Conclusion. The essence of the proposed mathematical models comes down to the synthesis of numerous indicators in the complex process of removal of nutrients and their impact on water quality. The proposed mathematical models make it possible to predict the removal of nutrients from agricultural lands and to develop and implement technical and technological solutions to prevent environmental pollution

Calculation of sulfur removal in ladle furnace unit by means of ionic theory of slags

This article describes issues of sulfur removal in ladle furnace unit. First of all, metal desulfurization in ladle steel treatment units is achieved due to transition of sulfur to the slag phase. Coefficient of partition of sulfur between metal and slag is affected by sulfide capacity of slag, coefficient of activity of sulfur in the metal, oxidation potential of medium and reaction equilibrium constant of partition of sulfur between metal and slag. Temperature of liquid state in the ladle has significant impact on sulfide capacity of slag. Proposed calculation procedure based on provisions of ionic structure of slags allows evaluating a concentration of sulfur in steel on the basis of determination of coefficient of its partition between metal and slag. Optical basicity is suggested as criterion of refining property of slag, it has been shown that the amphoteric oxide Al2O3 is essential to calculation of this indicator. Its impact on sulfide capacity of slag is detected. © Published under licence by IOP Publishing Ltd

Comparative assessment of modern parameters of glycemic control in children with type 1 diabetes after switching to fast-acting insulin aspart using Flash Glucose Monitoring in real clinical practice

BACKGROUND: Postprandial hyperglycaemia contributes significantly to the lack of glycaemic control in patients with type 1 diabetes mellitus (DM1). At least a quarter of patients forget to inject insulin before meals once a week, and more than 40% of them inject bolus insulin immediately before meals, which does not correspond to the pharmacokinetic effects of ultrashort insulins and determines the need to use insulins with better imitations of physiological insulin secretion.AIM: To assess the effect of fast acting insulin aspart (FIAsp) on the current parameters of glycaemic control in children with DM1 after switching from insulin Asp (iAsp) using continuous glucose monitoring.MATERIALS AND METHODS: A multicenter observational 12-week prospective open-label uncontrolled comparative study was initiated. A group of insufficiently controlled patients were identified (n = 48) including a group on multiple insulin injections therapy (MII) (insulin degludec and IAsp) and a group on continuous subcutaneous insulin infusion (CSII) of iAsp. Three 14-day flash glucose monitoring (FMG) were performed: before transferring patients to FiAsp and after 2 and 12 weeks of the transfer. Key endpoints: HbA1c after 2 and 12 weeks on FiAsp relative to baseline, analysis of 5 FMG target glucose ranges, presented as an ambulatory glycemic profile. Additional indicators: dynamics of insulin daily dose, frequency of glucose self- monitoring, the number of severe hypoglycemia, adverse events that occurred during treatment.RESULTS: 2 weeks after the transfer from IAsp to FIAsp, TIR increased in the entire group of patients: from 53% [44.3; 66.5] to 57% [47.4; 71.0] (p-value = 0.010) and TAR decreased from 38% [24.8; 50.2] to 30.5% [22.0; 45, 0] (p-value = 0.0124). Maintaining and increase time spent in the target glucose ranges during a 12-week observation period, in parallel with a significant decrease in hypoglycemic episodes <3.9 mmol / L per week, on FIAsp therapy naturally leads to an improvement in diabetes control: a decrease in HbA1c from 8.15% up to 7.75% (p-value = 0.0224), more pronounced in the group of patients on CSII — from 7.9% to 7.5% (p-value = 0.028).CONCLUSION: Switching from IAsp to BDIAsp in routine clinical practice in the MII and CSII regimen in children and adolescents with type 1 diabetes allows achieving better glycemic control compared to the previous generation prandial insulin analog Iasp. The better diabetes control is associated with an increase or a trend towards an increase in TIR and a decrease or a trend towards a decrease in TAR and TBR, as well as a significant decrease in episodes of hypoglycemia