A planar source of atmospheric-pressure plasma jet

In a single-barrier discharge with voltage sharpening and low gas consumption (up to 1 L/min), plane atmospheric pressure plasma jets with a width of up to 3 cm and length of up to 4 cm in air are formed in the slit geometry of the discharge zone. The energy, temperature, and spectral characteristics of the obtained jets have been measured. The radiation spectrum contains intense maxima corresponding to vibrational transitions of the second positive system of molecular nitrogen N2 (C3Π u → B3Π g ) and comparatively weak transition lines of the first positive system of the N 2 + ion (B2Σ u + → X2Σ g ). By an example of inactivation of the Staphylococcus aureus culture (strain ATCC 209), it is shown that plasma is a source of chemically active particles providing the inactivation of microorganisms

Challenges in QCD matter physics - The Compressed Baryonic Matter experiment at FAIR

Substantial experimental and theoretical efforts worldwide are devoted to explore the phase diagram of strongly interacting matter. At LHC and top RHIC energies, QCD matter is studied at very high temperatures and nearly vanishing net-baryon densities. There is evidence that a Quark-Gluon-Plasma (QGP) was created at experiments at RHIC and LHC. The transition from the QGP back to the hadron gas is found to be a smooth cross over. For larger net-baryon densities and lower temperatures, it is expected that the QCD phase diagram exhibits a rich structure, such as a first-order phase transition between hadronic and partonic matter which terminates in a critical point, or exotic phases like quarkyonic matter. The discovery of these landmarks would be a breakthrough in our understanding of the strong interaction and is therefore in the focus of various high-energy heavy-ion research programs. The Compressed Baryonic Matter (CBM) experiment at FAIR will play a unique role in the exploration of the QCD phase diagram in the region of high net-baryon densities, because it is designed to run at unprecedented interaction rates. High-rate operation is the key prerequisite for high-precision measurements of multi-differential observables and of rare diagnostic probes which are sensitive to the dense phase of the nuclear fireball. The goal of the CBM experiment at SIS100 (sqrt(s_NN) = 2.7 - 4.9 GeV) is to discover fundamental properties of QCD matter: the phase structure at large baryon-chemical potentials (mu_B > 500 MeV), effects of chiral symmetry, and the equation-of-state at high density as it is expected to occur in the core of neutron stars. In this article, we review the motivation for and the physics programme of CBM, including activities before the start of data taking in 2022, in the context of the worldwide efforts to explore high-density QCD matter.Comment: 15 pages, 11 figures. Published in European Physical Journal

Influence of Nanoparticles on the Structure and Mechanical Properties of Aluminium Alloys

В статье рассмотрено влияние добавок нанопорошков на структуру и механические свойства сплавов алюминия АК12 и А7. По результатам внутриформенного модифицирования выбраны порошки для упрочнения отливок. Получены образцы с уменьшенным размером зерен, обладающие повышенной твердостью и прочностьюThe article considers influence of nanoparticle additions on structure and mechanical properties of aluminium alloys Al99.7 and AlSi12. Powders for casting strengthening have been selected according to results of the intramold modification. The samples with refined grain size, improved hardness and strength have been obtaine

A planar source of atmospheric-pressure plasma jet

In a single-barrier discharge with voltage sharpening and low gas consumption (up to 1 L/min), plane atmospheric pressure plasma jets with a width of up to 3 cm and length of up to 4 cm in air are formed in the slit geometry of the discharge zone. The energy, temperature, and spectral characteristics of the obtained jets have been measured. The radiation spectrum contains intense maxima corresponding to vibrational transitions of the second positive system of molecular nitrogen N2 (C3Π u → B3Π g ) and comparatively weak transition lines of the first positive system of the N 2 + ion (B2Σ u + → X2Σ g ). By an example of inactivation of the Staphylococcus aureus culture (strain ATCC 209), it is shown that plasma is a source of chemically active particles providing the inactivation of microorganisms

Influence of Nanoparticles on the Structure and Mechanical Properties of Aluminium Alloys

В статье рассмотрено влияние добавок нанопорошков на структуру и механические свойства сплавов алюминия АК12 и А7. По результатам внутриформенного модифицирования выбраны порошки для упрочнения отливок. Получены образцы с уменьшенным размером зерен, обладающие повышенной твердостью и прочностьюThe article considers influence of nanoparticle additions on structure and mechanical properties of aluminium alloys Al99.7 and AlSi12. Powders for casting strengthening have been selected according to results of the intramold modification. The samples with refined grain size, improved hardness and strength have been obtaine

Our new tornado-compatible aortic valve prosthesis: notable results of hydrodynamic testing and experimental trials

Aims A shortcoming common to all existing designs of mechanical cardiac valve prostheses is an increased trombogenicity caused, among other factors, by the lack of hydrodynamic compatibility between the luminal part of the prosthesis and the patterned blood flow. The aim of the study is to design and test our new mechanical aortic valve prosthesis to exclude life-long anticoagulation treatment. Materials and methods Standard hydrodynamic tests of the new prosthetic valve have been carried out for comparing with the other existing valve designs. A new method for the heart valve prosthesis testing in a tornado-like flow has been developed. The valve function has been verified in a swine excluding the anticoagulation treatment during the period of time exceeding six months. Results The significant advantage of the new prosthesis in the standard hydrodynamic tests has been demonstrated. The tests in the tornado-like flow have shown that only this prosthesis allows maintaining the pattern, the head and flow rate characteristics of the tornado-like jet. Upon implanting the new prosthesis in the aortic position in a swine, the good performance of the valve without anticoagulation therapy has been confirmed in the course of more than six months. Conclusion Obtained has been the evidence of the merits of the new mechanical aortic valve owing to the due consideration of the hydrodynamic peculiarities of the aortic blood flow and the creation of the design providing the proper hydrodynamic compatibility

Preface

International audienc

Parallel Operation of the Power Supply Transformers of the Automatic Block System at Traction Substations of Adjacent Electrified Lines

Параллельная работа питающих трансформаторов автоблокировки на тяговых подстанциях смежных электрифицированных линий / А. П. Кордин, В. А. Деркач, В. Г. Мандыч, В. Г. Сыченко, В. В. Кузнецов // Електрифікація транспорту. — 2016. — № 11. — С. 28—35.RU: При параллельной работе высоковольтных линий питания автоблокировки в зонах стыкования систем электрической тяги постоянного и переменного тока возникают сбои в работе устройств автоблокировки, вызванные несоблюдением условий параллельной работы трансформаторов. Несогласованность их работы вызвана различными схемами подключения тяговых подстанций постоянного и переменного тока к линиям внешнего электроснабжения, разным количеством ступеней трансформации, а также разными схемами и группами соединения обмоток трансформаторов автоблокировки. В статье проведен анализ условий параллельной трансформаторов автоблокировки на смежных тяговых подстанциях разных систем электрической тяги и решена проблема обеспечения их согласованной работы.UK: При паралельній роботі високовольтних ліній живлення автоблокування в зонах стикування систем електричної тяги постійного і змінного струму виникають збої в роботі пристроїв автоблокування, викликані недотриманням умов паралельної роботи трансформаторів. Неузгодженість їх роботи викликана різними схемами підключення тягових підстанцій постійного і змінного струму до ліній зовнішнього електропостачання, різною кількістю ступенів трансформації, а також різними схемами і групами з'єднання обмоток трансформаторів автоблокування. У статті проведено аналіз умов паралельної трансформаторів автоблокування на суміжних тягових підстанціях різних систем електричної тяги і вирішена проблема забезпечення їх узгодженої роботи.EN: In parallel operation of high-voltage power lines of automatic block system in the areas of splicing electric traction systems AC and DC there are failures in the auto-lock devices, caused by failure to conditions of parallel operation of transformers. Inconsistency of their work caused by various schemes of traction substations connecting AC and DC lines to the external power supply, a different number of transformation steps, as well as various schemes and groups of windings connection of automatic block system of transformers. The article analyzes the conditions of parallel transformers auto-lock on the adjacent traction substations different electric traction systems and solved the problem of providing their coordinated work.Дорожная электротехническая лаборатория, Приднепровская железная дорога. Национальная металлургическая академии Украины, Днепропетровс