Hydrogen Gas Response of Zn1 – xAgxOy and Cu1 – xZnxOy Nanostructured Films

Detection of hydrogen gas in industry, biomedical systems and combustion systems is important for safety reasons. Silver doping in zinc oxide and zinc doping in copper oxide were investigated to obtain improved hydrogen sensing performances for sensors. Samples were grown by chemical method and studied by X-ray diffraction, SEM and sensorial techniques. For selectivity study samples were exposed to hydrogen, methane and ethanol gases. Were found growth and annealing regimes which allow us fabrication of faster and more selective gas sensors based on Zn1-xAgxOy nanostructured films and nanocrystallite Cu1-xZnxOy films with respect to 100 ppm H2

Electrical and galvanomagnetic properties of AuAl2+6%Cu intermetallic compounds at low temperatures

The AuAl2 intermetallic compounds are of substantial interest in view of their application potential. The investigated intermetallics AuAl 2+6%Cu were prepared from fine powders of AuAl2 and Cu by vacuum sputtering on a glass substrate and consisted of films with a thickness of about one micrometer. The films were annealed. The temperature and field dependence of the electroresistivity, the magnetoresistivity and the Hall effect of AuAl2+6%Cu films were measured in the temperature interval from 4.2 to 100 K and at magnetic fields of up to 15 T. We demonstrate that the temperature dependence of the electroresistivity has a minimum at T = 20 K and a metallic behavior above this temperature. The magnetoresistivity is very small (less then 1%), positive at low temperatures and negative above 12 K. The Hall coefficient is positive, which corresponds to the holes in a one zone model with a charge carrier concentration of about 1.6 1020 cm-3. © Published under licence by IOP Publishing Ltd

Ethanol Sensing Performances of Zinc-doped Copper Oxide Nano-crystallite Layers

The synthesis via chemical solutions (aqueous) (SCS) wet route is a low-temperature and cost-effective growth technique of high crystalline quality oxide semiconductors films. Here we report on morphology, chemical composition, structure and ethanol sensing performances of a device prototype based on zincdoped copper oxide nanocrystallite layer. By thermal annealing in electrical furnace for 30 min at temperatures higher than 550 ˚C, as-deposited zinc doped Cu2O samples are converted to tenorite, ZnxCu1-xOy, (x=1.3wt%) that demonstrate higher ethanol response than sensor structures based on samples treated at 450 ˚C. In case of the specimens after post-growth treatment at 650 ˚C was found an ethanol gas response of about 79 % and 91 % to concentrations of 100 ppm and 500 ppm, respectively, at operating temperature of 400 ˚C in air

Hydrogen Gas Response of Zn1 – xAgxOy and Cu1 – xZnxOy Nanostructured Films

Detection of hydrogen gas in industry, biomedical systems and combustion systems is important for safety reasons. Silver doping in zinc oxide and zinc doping in copper oxide were investigated to obtain improved hydrogen sensing performances for sensors. Samples were grown by chemical method and studied by X-ray diffraction, SEM and sensorial techniques. For selectivity study samples were exposed to hydrogen, methane and ethanol gases. Were found growth and annealing regimes which allow us fabrication of faster and more selective gas sensors based on Zn1-xAgxOy nanostructured films and nanocrystallite Cu1-xZnxOy films with respect to 100 ppm H2

Complete revascularization is associated with higher mortality in patients with ST-elevation myocardial infarction, multi-vessel disease and shock defined by hyperlactataemia: results from the Harefield Shock Registry incorporating explainable machine learning

Aims Revascularization strategy for patients with ST-elevation myocardial infarction (STEMI) and multi-vessel disease varies according to the patient’s cardiogenic shock status, but assessing shock acutely can be difficult. This article examines the link between cardiogenic shock defined solely by a lactate of ≥2 mmol/L and mortality from complete vs. culprit-only revascularization in this cohort. Methods and results Patients presenting with STEMI, multi-vessel disease without severe left main stem stenosis and a lactate ≥2 mmol/L between 2011 and 2021 were included. The primary endpoint was mortality at 30 days by revascularization strategy for shocked patients. Secondary endpoints were mortality at 1 year and over a median follow-up of 30 months. Four hundred and eight patients presented in shock. Mortality in the shock cohort was 27.5% at 30 days. Complete revascularization (CR) was associated with higher mortality at 30 days [odds ratio (OR) 2.1 (1.02–4.2), P = 0.043], 1 year [OR 2.4 (1.2–4.9), P = 0.01], and over 30 months follow-up [hazard ratio (HR) 2.2 (1.4–3.4), P < 0.001] compared with culprit lesion-only percutaneous coronary intervention (CLOP). Mortality was again higher in the CR group after propensity matching (P = 0.018) and inverse probability treatment weighting [HR 2.0 (1.3–3.0), P = 0.001]. Furthermore, explainable machine learning demonstrated that CR was behind only blood gas parameters and creatinine levels in importance for predicting 30-day mortality. Conclusion In patients presenting with STEMI and multi-vessel disease in shock defined solely by a lactate of ≥2 mmol/L, CR is associated with higher mortality than CLOP.British Heart Foundation (FS/19/73/34690 to I.C.)

Migration and Localization of Metal Atoms on Strained Graphene

Reconstructed point defects in graphene are created by electron irradiation and annealing. By applying electron microscopy and density functional theory, it is shown that the strain field around these defects reaches far into the unperturbed hexagonal network and that metal atoms have a high affinity to the nonperfect and strained regions of graphene. Metal atoms are attracted by reconstructed defects and bonded with energies of about 2 eV. The increased reactivity of the distorted π-electron system in strained graphene allows us to attach metal atoms and to tailor the properties of graphene.Peer reviewe

Modern strategies for regulating the motor activity of preschool and school age children in the educational space

Purpose: the systematization of modern strategies for regulating the motor activity of preschool and school-age children. The criteria for assessing motor activity taking into account the individual characteristics of children and sociocultural conditions are considered. The adaptive strategy of regulation of the motor activity of a growing person in modern educational space is substantiated. Material: 10 theses and more than 80 papers published in specialized journals of Russia, Ukraine, Kazakhstan, Belarus were analyzed. In the article is used quantitative approach, which has research and descriptive character. This approach includes methods for examining documents. The identification of studies over the past 50 years has been carried out. The analysis of normative program-methodological materials, educational standards, exemplary educational programs and the results of their own research was carried out. These studies substantiated various approaches to regulating and forming positive dynamics of motor activity in preschool and school-age children. Results: Three strategies for regulating motor activity were identified: biological, value-social and biosocial (adaptive). Their compliance with the level of scientific and methodological knowledge and domestic experience is established. The limiting factors have been established and ways of transforming the system of physical education at different levels of education have been concretized. The modern adaptive strategy of regulation of the motor activity of preschool children and younger schoolchildren is substantiated. The expediency of its introduction into the educational process is shown. This creates a favorable environment for the physical development of children. Conclusion: The adaptive system for regulating motor activity should take into account: the interests and opportunities of children at all levels of the educational system; regional sports traditions; sociocultural and climatic conditions. It is extremely important to recreate the playing space of childhood. This contributes to the formation of an active position in relation to the physical culture of the individual

The efficacy of angiotensin–I receptor blocker Valsartan in patients with cronic obstructive lung disease

Department of Chronic Obstructive Pulmonary Disease, Chiril Draganiuc Institute of Phthysiopulmonology, Department of Functional Diagnostic, Republican Diagnostic Medical Center, Chisinau, the Republic of MoldovaBackground: The purpose of this study was the clinical, functional and instrumental evaluation of efficacy and safety of angiotensin-I receptor blocker Valsartan in patients with chronic obstructive pulmonary disease. Material and methods: There were investigated 25 patients (mean age 50.5 ± 4.34 years) with moderate to severe forms of obstructive lung disease – initial and after 5 weeks of treatment with angiotensin – I receptor blocker Valsartan (Nortivan, ,,Gedeon Richter’’, Hungary), mean dose 54.5 ± 15.4 mg once-daily, using standard ECG, EchoCG with Doppler, bodyplethysmography, ultrasound Doppler (for endothelial function estimation), pulmonary diffusion capacity for CO, cycloergometry - initial and after short – term treatment with Nortivan. Results: There were not detected any negative changes on bronchial permeability after the treatment. Significant improvement of endothelial function, pulmonary diffusion capacity, parallel with considerable decreasing of pulmonary artery systolic and mean pressure and total bronchial resistance – were observed after 5 weeks of treatment. Conclusions: Nortivan is well-tolerated and highly effective in patients with moderate to severe forms of obstructive lung disease