Development of applied materials science in the Republic of Belarus

В сборнике представлены аналитические материалы и результаты исследований в области материаловедения экспертов из научных, образовательных и инновационных организаций в странах : Азербайджан, Беларусь, Грузия, Молдова, Румыния, Россия, Украина, Южная Африка, Словакия и Чешская Республика

Конкурентоспособности продукции украинских предприятий в условиях глобализации мировой экономики

Дана стаття присвячена висвітленню питання конкурентоспроможності продукції з огляду на все більшу глобалізацію світової економіки. Розглянуто факторіальну оцінку конкурентоспроможності підприємства та запропоновано метод її підрахунку. Визначено методику розрахунку конкурентоспроможності продукції та окреслено головні етапи найбільш дієвого з них – методу відносних показників.This article is about competitiveness, it takes into account the increase in the globalization of the world economy. Here we examined the factorial assessment of the competitiveness of enterprises and offered the method of calculation of competitiveness. We determined the methodology for calculating the competitiveness of products and specify the main stages of the most effective of them – the method of the relative performance.Данная статья освещает вопросы конкурентоспособности продукции с учетом все большей глобализации мировой экономики. Рассмотрена факториальная оценка конкурентоспособности предприятия и предложен метод ее подсчета. Определена методика расчета конкурентоспособности продукции и намечены основные этапы наиболее действенного из них – метода относительных показателей

Cortical feedback loops bind distributed representations of working memory

Working memory—the brain’s ability to internalize information and use it flexibly to guide behaviour—is an essential component of cognition. Although activity related to working memory has been observed in several brain regions, how neural populations actually represent working memory and the mechanisms by which this activity is maintained remain unclear. Here we describe the neural implementation of visual working memory in mice alternating between a delayed non-match-to-sample task and a simple discrimination task that does not require working memory but has identical stimulus, movement and reward statistics. Transient optogenetic inactivations revealed that distributed areas of the neocortex were required selectively for the maintenance of working memory. Population activity in visual area AM and premotor area M2 during the delay period was dominated by orderly low-dimensional dynamics that were, however, independent of working memory. Instead, working memory representations were embedded in high-dimensional population activity, present in both cortical areas, persisted throughout the inter-stimulus delay period, and predicted behavioural responses during the working memory task. To test whether the distributed nature of working memory was dependent on reciprocal interactions between cortical regions, we silenced one cortical area (AM or M2) while recording the feedback it received from the other. Transient inactivation of either area led to the selective disruption of inter-areal communication of working memory. Therefore, reciprocally interconnected cortical areas maintain bound high-dimensional representations of working memory

КОСМОГОНІЧНІ МІФИ ДАВНІХ СКАНДИНАВІВ І СЛОВЯН: СПІЛЬНЕ І ВІДМІННЕ

У цій статті показані спільні і відміні риси у космогонічних міфах давніх скандинавів і слов’ян. У статті показано тих, хто виступав творцями світу в міфології давніх скандинавів і слов’ян. Показано місце, де відбувався процес творення, а також спосіб, який був використаний творцями (In this article showing common features and the abolition of cosmogonic myths of the ancient Scandinavians and Slavs. The article depicts those who were the creators of the world in the mythology of the ancient Scandinavians and Slavs. A place, where the process of creation took place and also the method that was used by creators

First experience in off pump coronary artery bypass grafting of anterior descending artery via inferior mini-sternotomy

Spitalul Internaţional “Medpark”, Chişinău, Republica Moldova, Al XII-lea Congres al Asociației Chirurgilor „Nicolae Anestiadi” din Republica Moldova cu participare internațională 23-25 septembrie 2015Introducere: În prezent pontajul coronarian pe o singură arteră reprezintă o raritate. Cardiologia intervenţională rezolvă marea majoritate a cazurilor cu afectarea patului coronarian cu o singură limitare – afectarea ostială a arterei descendente anterioare (ADA). Pentru pontajul coronarian pe cord bătând (CB): artera toracică internă stângă (ATIS) anastomozată cu ADA, este cunoscut abordul toracic miniminvaziv. Acestui abord îi sunt valabile şi unele exigenţe deosebite: set de ustensile adaptate special pentru minitoracotomie, echipă polidisciplinară bine formată şi, desigur, experienţa chirurgului operator. O problemă actuală, pentru perioada postoperatorie, rămâne combaterea durerii postoperatorii. Scopul lucrării a fost implementarea abordului mini-invaziv în operaţiile pe CB. Material şi metode: Pe parcursul ultimilor 5 ani, operaţi pe CB prin sternotomie inferioară au fost 13 pacienţi (5 femei, 8 bărbaţi), vîrsta medie – 59,3 ani. Toţi pacienţii au prezentat o afectare monovasculară severă pe ADA, segmentul I ostial. Stabilizarea cordului și a arterei – efectuată cu ajutorul dispozitivului “Octopus 4”. Anastomoza ATIS-ADA – efectuată cu sutură Prolene 8/0. Rezultate: Perioada postoperatorie complicată cu hemoragie – 1 pacient, menajată conservativ. Durata medie a spitalizării a constituit 4,5 zile. În perioada precoce şi de lunga durată accese anginoase nu s-au înregistrat. Concluzii: Mini-sternotomia inferioară reprezintă un abord optim către ADA, cu expoziţie suficientă pentru prelevarea ATIS. Sindromul algic postoperator este minim, reconvalescenţa fizică este rapidă, amplituda mişcărilor în membre superioare – nelimitată.Introduction: Nowadays, a single artery bypass surgery is a rarity. Interventional cardiology solves most cases of affected coronary arteries, with a single limitation – ostial involvement of anterior descending coronary artery (ADCA). For beating-heart coronary bypass (BHCB): left internal thoracic artery (LITA) anastomosis with anterior descending artery is well known minimally invasive thoracic approach. But for this approach several special requirements should be met: set of tools specially adapted for mini-thoracotomy, well trained multidisciplinary team and the experience of surgeon. A current problem is combating of the postoperative pain. Aim of the study was the implementation of minimally invasive access in BHCB. Material and methods: During the last five years, 13 patients (5 women, 8 men) with mean age – 59.3 years were operated with BHCB. All patients presented a severe single vessel injury of ADCA in I ostial segment. Stabilization of the heart and artery was carried out with the device Octopus 4. The anastomosis between LITA-ADCA was performed with the Prolene 8/0 suture. Results: The postoperative period was complicated with hemorrhage in 1 patient, treated conservatively. The mean duration of hospitalization was 4.5 days. In early and long-term postoperative period relapses of heart angina were not registered. Conclusion: Lower mini-sternotomy is an optimal approach to ADCA, with sufficient exposition for harvesting LITA. Postoperative pain syndrome is minimal, physical recovering is fast, the amplitude of movements in upper limbs is unrestricted

Technology of drinking water preparation using the reactor - clarifier

Siberian surface water and groundwater are characterized by low temperatures for a long year period. Many groundwater sources’ organic composition are formed of soil and peat humus, marsh feeding of rivers, decomposition of plankton, higher water, and soil grass in reservoirs and lakes. Organic colloids in natural waters and in humic substances give the color of water. It’s yellowish coloration of varying intensity. Thus, the Om River’s water color in the city of Kuibyshev in the Novosibirsk Region is 500 degrees with feculence of less than 3 mg/l. A number of underground water sources also have an increased content of organic contaminants caused by peat bogs at great depths and high water colority with low turbidity. For example, the water color is up to 1500 degrees in the Namtsy village of the SAHA-Yakutia Republic. In addition, underground water and, to a greater extent, surface water are often characterized by a high content of iron (up to 20 mg/l), manganese (up to 4 mg/l), and other impurities of natural and anthropogenic origin. Iron and manganese are in natural waters in the form of mineral or organic complex compounds of humic or some fatty acids. In the second case, these waters are with increased oxidizability and rather aggressive nature. In particular, the iron content is 3 mg/l, manganese is 1 mg/l, the permanganate oxidizability is 50 mg/l in the water of the Om River

Experience of activity of cardiac surgery service in Medpark international hospital during the years 2011-2015

Spitalul Internaţional Medpark, Chişinău, Republica Moldova, Al XII-lea Congres al Asociației Chirurgilor „Nicolae Anestiadi” din Republica Moldova cu participare internațională 23-25 septembrie 2015Introducere: Practica medicală privată complexă şi multiprofilară în ţara noastră reprezintă o formă de succes în sistemul medical autohton. În ultimii ani aceasta capătă o ascensiune considerabilă, ocupîndu-şi pe drept poziţia de lider pe segmentul calităţii actului medical și al satisfacției pacientului. Spitalul Internaţional Medpark şi-a deschis uşile la finele lunii februarie 2011, iar prima operaţie cardiochirurgicală a avut loc la începutul lunii mai 2011. Scopul lucrării este prezentarea experienţei naţionale de tratament cardiochirurgical complex în primul spital multiprofilar privat din Republica Moldova. Material şi metode: Pe parcursul perioadei mai 2011-iunie 2015, în cadrul Spitalului Internaţional Medpark au fost operaţi 812 pacienţi (423 bărbaţi, 389 femei), vîrsta medie – 60,3 ani. Rezultate: Durata medie a spitalizării a constituit 7,3 zile, dintre care aflarea în mediu a pacienților în sectia de terapie intensivă a fost sub 24 de ore. Timpul de reacţie în intervențiile urgente – sub 1,5 ore. Rata mortalităţii a constituit 1,3%. Concluzii: Medpark este primul spital general privat din Moldova şi unicul spital din zona Europei de Est acreditat JCI. Complexitatea intervenţiilor cardiochirurgicale aici, rămîne a fi una extrem de variată, ceea ce a necesitat o antrenare suplimentară, în regim nonstop, a întregii echipe cardiochirurgicale. Conformarea la criteriile internaţionale de acreditare impun o continuă perfecţionare şi respectare a protocoalelor de tratament. În centrul atenției întregii cardio-echipe din Medpark este sănătatea pacientului.Introduction: The private complex medical practice in our country is a successful shape of local medical system. In recent years it acquires a considerable upswing and rightfully occupies the leading position on the segment of medical service quality and patient satisfaction. Medpark International Hospital has opened its doors at the end of February 2011 and the first cardiac surgery was performed at the beginning of May 2011. The aim of study is presentation of national experience in complex cardiac surgery treatment in first general private hospital from Moldova. Material and methods: During the period from May 2011 to June 2015, in International Hospital Medpark were operated 812 patients (423 men, 389 women), the average age – 60.3 years. Results: The mean duration of hospitalization was 7.3 days and the average duration of patient treatment in Intensive Care Unit was under 24 hours. The reaction time in emergency surgeries – was under 1.5 hours. The mortality rate was about 1.3%. Conclusions: Medpark is the first private general hospital from Moldova and the only one hospital in Eastern Europe JCI accredited. The complexity of cardiac surgery here remains extremely varied, which necessitated an additional entrainment in nonstop regime, of the whole cardiosurgical team. Compliance with the international accreditation criteria requires continuous improvement and enforcement of the treatment protocols. The focus of the entire cardiosurgical team from Medpark is firstly patient's health

Operaţiile plastice în corecţia valvulopatiilor mitrale

Intervenţiile reconstructive pe valva mitrală înregistrează o creştere tot mai rapidă. Răspândirea acestor operaţii a fost impulsionată de imperfecţiunile protezelor valvulare. Prioritatea plastiei mitrale faţă de protezare este evidentă. Ea asigură un prognostic favorabil de supravieţuire, permite păstrarea funcţiei contractile a ventriculului stâng, reduce complicaţiile infecţioase şi tromboembolice, se mic- şorează frecvenţa hemoragiilor în urma administrării anticoagulantelor. În acest studiu analizăm prima noastră experienţă de reconstrucţie a valvei mitrale la 66 de pacienţi. Au fost studiate cauzele apariţiei patologiei valvulare, tehnicile chirurgicale aplicate, precum şi rezultatele postoperatorii precoce şi tardive. În concluzie, menţionăm că efectuarea operaţiilor plastice impune, în primul rând, depistarea într-un stadiu precoce a afectării valvulare, până la instalarea modifi cărilor anatomice semnifi cative. Rezultatele precoce şi tardive obţinute sunt foarte bune, cea ce permite să extindem indicaţiile pentru operaţiile reconstructive pe valva mitrală

Formation of the Transition Zone "Matrix Alloy - Reinforcing Granules" in the Process of Solid-Liquid Synthesis of Composite Material

Casted composite materials have found certain application in mechanical engineering. Their advantages are lower cost due to the use of casting technology (solid-liquid synthesis), absence of any restriction on the shape and weight of parts. It is known that the transition zone between the matrix alloy and reinforcing phase plays an important role on the level of mechanical properties of cast composites. So, the aim of the study is investigations of transition zone formation during the infiltration of matrix alloy into the frame formed by the reinforcing phase. Copper based alloy was used as a matrix alloy and cast-iron granules were used as a reinforcing phase. Cast composite materials have been exposed for different time during the synthesis. Specimens were studied using electron microscopy. Results on the concentration distribution of main elements (Si, Fe, Cu) in a transition zone are presented. It is shown that the formation of transition zone starts during the infiltration process with further its growth during the exposition at the synthesis temperature. It is established that the formation of the transition zone takes place not only due to elements diffusion but as well due to the dissolution of granules of reinforcing phase. Experiments carried out allow establishing some peculiarities of the transition zone formation. To achieve required level of mechanical properties it is necessary to control the melt temperature and duration of the synthesis of cast composite materials

Реакторы с микротвэлами: гидродинамика проницаемых каналов насыпной сборки

The prospect of use of fuel in the form of micro particles (balls with a diameter about a millimeter formed by the fissile material and a protective cover to hold the radioactive fission products) in nuclear reactors is disclosed. It’s marked that flow ability, large specific surface of heat removal, extraordinary high resistance of micro fuel particles allow to design innovative safe reactors for various purpose: transportable, breeders, high-temperature, high neutron flux etc. It’s suggested to complete the active zone by bulk heat releasing assemblies. In them the advantages of spherical micro fuel particles and a coolant side supply to the bed through permeable distribution and branch channels are harmoniously combined in these assembles. It is presented the scheme of bulk assemblies and carried out the analysis of modeling of dynamics of a stream in permeable channels. It is shown that the mathematical description of liquid movement in such channels has ambiguity and discrepancy. To eliminate modeling shortcomings a new kinematic image of current in the permeable channels was offered. It was proposed instead of the existing one representing a jet to which particles of coolant were continuously joined or separated on the permeable wall. In the new interpretation the flow in the permeable channel is considered as turn of the stream at its simultaneous expansion or narrowing depending on there is outflow or inflow. On the base of this image the equation for determination of coolant pressure changing in the permeable channel is obtained; reaction of a stream for changing of flow rate increment is established, the tangent component of a velocity on a permeable wall is founded. Thereby the disadvantages of describing of coolant moving in the bulk assembles channels are eliminated. Permeable channels are used not only in nuclear reactors, but also in many other technological devices: catalytic reactors, heat exchangers, filters, collector and distributing systems. The obtained results can be used for designing other devices with permeable channels.Раскрыта перспектива использования в ядерных реакторах топлива в виде микротвэлов – шариков из делящегося материала диаметром порядка миллиметра, покрытых защитной оболочкой для удержания радиоактивных продуктов деления. Отмечено, что сыпучесть, большая удельная поверхность теплосъема, необычайно высокая стойкость микротвэлов позволяют на их базе проектировать инновационные безопасные реакторы различного целевого назначения (транспортабельные, бридеры, высокотемпературные, высокопоточные и т. д.). Предложена комплектация активной зоны реактора с насыпными тепловыделяющими сборками. В них гармонично сочетаются достоинства микротвэлов с преимуществами бокового подвода теплоносителя к топливному слою с помощью проницаемых распределительного и отводного каналов. Представлена схема насыпной сборки и проведен анализ моделирования динамики потока в проницаемых каналах. Показано, что существующее математическое описание движения теплоносителя в них отличается неоднозначностью и противоречивостью. Для устранения недостатков в моделировании построен новый кинематический образ течения в проницаемом канале взамен существующего, представляющего собой струю, к которой на проницаемой стенке непрерывно присоединяются или отделяются от нее частицы теплоносителя. Движение в проницаемом канале в новой трактовке рассматривается как поворот потока при одновременном его расширении или сужении в зависимости от того, происходит в канале отток или приток. На основании такого представления получено уравнение изменения давления теплоносителя в проницаемом канале, определена реакция потока на приращение расхода, описана величина касательной составляющей вектора скорости на проницаемой стенке, тем самым устранены недостатки описания движения теплоносителя в каналах насыпной сборки. Полученные результаты могут также использоваться при проектировании других технических устройств, содержащих проницаемые каналы