Plasma probe characteristics in low density hydrogen pulsed plasmas

Probe theories are only applicable in the regime where the probe's perturbation of the plasma can be neglected. However, it is not always possible to know, a priori, that a particular probe theory can be successfully applied, especially in low density plasmas. This is especially difficult in the case of transient, low density plasmas. Here, we applied probe diagnostics in combination with a 2D particle-in-cell model, to an experiment with a pulsed low density hydrogen plasma. The calculations took into account the full chamber geometry, including the plasma probe as an electrode in the chamber. It was found that the simulations reproduce the time evolution of the probe IV characteristics with good accuracy. The disagreement between the simulated and probe measured plasma density is attributed to the limited applicability of probe theory to measurements of low density pulsed plasmas. Indeed, in the case studied here, probe measurements would lead to a large overestimate of the plasma density. In contrast, the simulations of the plasma evolution and the probe characteristics do not suffer from such strict applicability limits. These studies show that probe theory cannot be justified through probe measurements

Geometric phase and o-mode blue shift in a chiral anisotropic medium inside a Fabry-P\'erot cavity

Anomalous spectral shift of transmission peaks is observed in a Fabry--P\'erot cavity filled with a chiral anisotropic medium. The effective refractive index value resides out of the interval between the ordinary and the extraordinary refractive indices. The spectral shift is explained by contribution of a geometric phase. The problem is solved analytically using the approximate Jones matrix method, numerically using the accurate Berreman method and geometrically using the generalized Mauguin--Poincar\'e rolling cone method. The $o$-mode blue shift is measured for a 4-methoxybenzylidene-4'-$n$-butylaniline twisted--nematic layer inside the Fabry--P\'erot cavity. The twist is electrically induced due to the homeoplanar--twisted configuration transition in an ionic-surfactant-doped liquid crystal layer. Experimental evidence confirms the validity of the theoretical model.Comment: the text is available both in English (Timofeev2015en.tex) and in Russian (download: other formats - source - Timofeev2015ru.tex, Timofeev2015rus.pdf

Experimental observation of spontaneous spin polarization of electrons in hybridized states of transition element impurities in semiconductors

Experimental evidence of the possible existence of spontaneous spin polarization of the electron system in hybridized states formed by transition element impurity atoms in the conduction band of semiconducting crystals is examined. The details of a quantitative interpretation of experiments on the temperature dependence of the specific heat and elastic moduli of mercury selenide crystals with iron impurities confirm the feasibility of establishing the presence of electron spin polarization in this type of experiment, as well as the possible existence of polarization in the crystals studied here. Theoretical arguments support the observation of a thermodynamic anomalous Hall effect owing to spontaneously polarized donor electrons from low-concentration impurities. © 2013 AIP Publishing LLC

Investigation of contamination caused by rubber compactor in arsine purified in gas centrifuge

In the process of studying the application of gas centrifuges for deep purification of arsine from impurities sulphur was found. Estimation of quantitative content of sulphur in pure arsine showed the value -10-4 wt. %. The sources of sulphur was stated to be rubber compactors forming gas centrifuge complex and made from rubber on the basis of butadiene_nitrile caoutchouc using sulfur cure. Using rubber compactors made from rubber produced from fluoroelastomers, not undergoing to sulfur cure one can provide sulphur content in pure product less than 10-5 wt. %

Methodological Approaches to Studying Fatal Adverse Drug Reactions

Serious adverse drug reactions (ADRs) to medicinal products can cause death. It is an immediate challenge for modern medicine to prevent the possibility of this outcome and to improve the safety of pharmacotherapy. The aim of this study was to identify and analyse the main methodological approaches to studying the prevalence, patterns, and risk factors of fatal ADRs. The authors identified three main methods for studying such reactions: analysis of death certificates, monitoring of spontaneous reports, and review of clinical trials with a particular focus on safety. Each of these methods has its advantages and limitations. Clinical trials provide the most accurate information on the prevalence of fatal ADRs. For inpatients, this value ranged from 0.05 to 0.95% of the total number of hospital admissions. Data from death certificates may be particularly useful for identifying the groups of medicinal products posing a high risk of death and for making longitudinal comparisons. Monitoring of spontaneous reports is very effective in rapidly identifying fatal adverse reactions to new medicinal products. According to the authors, not only the choice of a data collection method, but also its application can affect the results of an ADR study. It was noted that the data varied across clinical trials conducted in different countries. Such variations indicate the importance of studying the problem of fatal ADRs at the national level, as well as the need for initiating such studies in the Russian Federation

Justification for Changing the Geometry of the Spring Pin Pickup Surface of the Grain Crop Pickup

The issue of reducing grain losses during separate harvesting when using a conveyor pickup is a scientific and an applied problem. In this work, the obtained results of industrial research of a conveyor pickup equipped with a spring pin with an annular coil on the pickup surface were investigated. In this article, the theoretical prerequisites for changing the geometry of the pickup surface of the spring pin of the grain crop pickup were considered, as well as options for changing the geometry of the pickup surface of the spring pins of the grain crop pickup. © 2022 American Institute of Physics Inc.. All rights reserved

Impact on the budget of ONLS program of vedolizumab introduction for the treatment of inflammatory bowel disease

Aim. Evaluation of the impact on the budget of the program for the provision of necessary medications (ONLS program) for the inclusion of a new drug vedolizumab for the treatment of adult patients with moderate or severe active ulcerative colitis (UC) and moderate or severe active Crohn’s disease (CD). Material and methods. The analysis provides a retrospective study based on published data. Based on the results of the auctions for the purchase of compared drugs, the size of the target population of the patients was calculated in the framework of ONLS. The calculation was carried out taking into account the proportion of drugs used for the therapy of inflammatory bowel diseases (IBD) in the total volume of purchased inhibitors of TNF-a. For the target group identified, the budget load is determined with the gradual replacement of TNFa inhibitors with vedolizumab. The horizon of the study was 3 years. The calculations used the average tender prices for the package of the preparation for 2016. Results. It is established that the cost of 1 year of therapy with vedolizumab is lower than that for infliximab, adalimumab or golimumab. The inclusion of vedolizumab in ONLS implies the subsequent replacement of TNFa inhibitors by vedolizumab: in the first year in 11% of patients with UC and 15% of patients with CD, in the second year in 17 and 32%, respectively, in the 3rd year 28 and 43% respectively. This allows to reduce the budget impact for 3 years for the treatment of UC by 11,9 million rubles, and for CD therapy by 24,1 million rubles. With the increase in the share of vedolizumab on the market by replacing TNFa inhibitors, budgetary savings are increasing. Vedolizumab therapy is the most effective option in the treatment of IBD from a clinical and clinico-economic point of view in comparison with TNFa inhibitors. Conclusion. The inclusion of the drug vedolizumab in ONLS is pharmacoeconomically feasible. The use of vedolizumab in terms of Budget impact Analysis is preferable to the current treatment regimen including infliximab, adalimumab, golimumab and cerolizumab pegol

Medication errors associated with carbapenems

Purpose. The purpose of this study was to discover the prevalence and types of medication errors associated with the use of carbapenems. Materials and methods. We analyzed 161 spontaneous reports concerning adverse drug reactions associated with the carbapenems. All the reports were submitted to the Russian pharmacovigilance database between 01.01.2012 and 01.08.2014. Approved prescribing drug information, standards of medical care and practical guidelines for certain conditions were used to identify medication errors associated with specific products. Results. The prevalence of medication errors associated with the use of carbapenems was 24,8%. The reporters indicated medication error-related term only in 5,0% of these cases. The most common types of identified medication errors (44,0%) were deviations from the recommended dosing scheme, in most cases (20,0%) medication errors resulted from wrong frequency of administration of the antibiotic. Conclusions. The results of this study show that the reporters rarely recognize and identify medication errors. We suggest emphasizing the importance of compliance with the dosage regimen of antibiotics; the frequency of administration of carbapenems is critical

Synthesis of Pah-Containing Copolymers on the Basis of Acrylic Acid

This work was funded by Russian Science Foundation (Ref no. 18-73-00301)

Perylene-3-carbaldehyde and Perylen-3-Ylmethanol: Syntheses and Spectral-Fluorescent Studies of the Liposome Loading

The authors acknowledge the Russian Science Foundation (Ref. № 18-73-00301) for funding