Super Heavy Nano Reinforcing Concrete

The properties of modern heat resistant super heavy concrete reinforced by chrysotile nanotubes are described. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3522

The two accretion states of the polar 1RXS J184542 in 2012

We present the photometric investigation of the newly discovered magnetic cataclysmic variable (polar) 1RXS J184542 during four months in 2012. We used the CCD observations in R-band obtained with the 0.5-m ARCSAT telescope at the Apache Point Observatory. It was found that during this time the object changed its relatively high accretion state to the low one. There was a two-pole accretion at the high state and one-pole accretion at the low state

Theory of surface cyclotron X-modes at the second harmonic of electron cyclotron frequency excited by alternating electric field

Instability of surface cyclotron X-modes at the second harmonic of electron cyclotron frequency (SCXM) in di-electric planar waveguide filled by plasma is studied in kinetic approximation. An external magnetic field is assumed parallel to the plasma surface. Doing that, two components of the SCXM wave vector, which are perpendicular to external magnetic filed have been taken into the account in Vlasov-Boltzmann kinetic equation. Unlike the previous consideration an amplitude value of the alternating electric field is assumed to be either less or approximately equal to unit. Simple expressions for growth rates of the SCXM parametrical instability are calculated. The obtained results can be used for controlling of gas discharges sustained by surface waves under the regime of electron cyclotron resonance.Неустойчивость поверхностных циклотронных Х-мод на второй гармонике электронных циклотронных частот (ПЦХМ) в диэлектрических планарных волноводах с плазменным наполнением исследована в кинетическом приближении. Внешнее магнитное поле считалось параллельным поверхности плазмы. При этом две компоненты волнового вектора ПЦХМ, перпендикулярные внешнему магнитному полю, были учтены в кинетическом уравнении Власова-Больцмана. В отличие от предыдущего подхода к решению этой проблемы амплитуда внешнего переменного электрического поля предполагалась меньшей или приблизительно равной единице. Простые выражения для инкрементов параметрической неустойчивости ПЦХМ выведены. Полученные результаты могут быть использованы при управлении газовыми разрядами, которые поддерживаются поверхностными волнами в режиме электронного циклотронного резонанса.Нестійкість поверхневих циклотронних Х-мод на другій гармоніці електронних циклотронних частот (ПЦХМ) у діелектричних планарних хвилеводах із плазмовим наповненням досліджено у кінетичному наближенні. Зовнішнє магнітне поле вважалося паралельним межі плазми. При цьому дві компоненти хвильового вектора ПЦХМ, що є перпендикулярними до зовнішнього магнітного поля, були враховані у кінетичному рівнянні Власова-Больцмана. На відміну від попереднього підходу до розв’язання цієї проблеми амплітуда зовнішнього змінного електричного поля вважалася меншою або приблизно рівною одиниці. Прості вирази для інкрементів параметричної нестійкості ПЦХМ виведено. Здобуті результати можна використати при керуванні газовими розрядами, що підтримуються поверхневими хвилями у режимі електронного циклотронного резонансу

Changes in the functional condition of the masticatory muscles with increased teeth abrasion

OBJECTIVE: Introduction: The term "pathological abrasion" (increased abrasion) can be described as a loss of tooth hard tissue on the occlusal, oral, vestibular surfaces of teeth or in the occlusal area. Treatment of increased abrasion of teeth is a difficult task for the practical work of a dentist. The choice of the optimal treatment plan provides the greatest likelihood of long-term success and minimal probability of complication appearance. The aim of our work was to study the functional activity of the masticatory muscles in the pathogenesis of the development of increased abrasion of tooth hard tissues. PATIENTS AND METHODS: Materials and methods: In order to achieve the goal of the study, an examination of patients aged between 19 and 69 years old was carried out in order to identify the number of persons with increased abrasion of teeth. During the examination of all patients one control and one researched group were formed. The patients of the control group (30 patients aged from 18 to 60 years) which had intact dental rows with any signs of increased tooth wear. The investigated group consisted of 25 patients, aged from 18 to 60 years. Depending on the complex treatment, the patients of the second group were divided into two subgroups. Subgroup 2A - (10 patients) with increased abrasion of tooth hard tissues with planned complex treatment of the disease without additional use of mouthguards after the end of treatment. For the patients from the 2B subgroup (15 people with increased abrasion of tooth hard tissues) a mouthguard was prescribed after the end of the complex treatment. In order to study some peculiarities of the muscular activity of the maxillofacial region an electromyogram was taken from all participants before treatment and repeated in a six- and twelve-months term. RESULTS: Results and conclusions: In our opinion, all manifestations of increased tooth abrasion are associated with changes in the muscular system, the motor apparatus and the nervous activity of the body. Regarding to this, the study of the propria muscular system and the related bone system can justify the usage of one or another prevention or treatment of the pathology. Based on the results of our research, we can conclude that the study of the functional state of the muscle complex is a fairly reliable prognostic sign in the study of such a disease as an increased tooth abrasion

Calculation of the frequency electronic transmission factors at the passage through the polymeric polyimide composite material filled by bismuth silicate

In this paper, a theoretical evaluation of the interaction of fast electrons with a polymer polyimide composite filled with bismuth silicate was carried out, calculations were carried out for the specific energy losses of electrons and transmission coefficients. It is shown that the Bi, C, and O atoms make a greater contribution to the ionization losses, and the radiation losses are practically due only to the Bi atoms. It has been established that at the electron energies from 1 to 6 MeV, interesting from the point of view of electronic protection of equipment in outer space, the losses are mainly determined by the ionization of atoms, and not by radiation losses. It is established that for an electron energy of 6 MeV at a composite thickness of up to 0.8 cm, the transmittance by the number of electrons predominates, and at a composite thickness of more than 0.8 cm, the transmission coefficient of electrons over the energy begins to predominate. The high stability of the developed composite with respect to the flux of fast electrons is shown in the general case of their fall at different angles to the normal of the target surface.Проведено теоретична оцінка взаємодії швидких електронів з полімерним поліімідним композитом, наповненим силікатом вісмуту, і розрахунки за питомими втратами енергії електронів і коефіцієнтам пропускання. Показано, що найбільший внесок у іонізаційні втрати вносять атоми Bi, C і O, а радіаційні втрати практично обумовлені тільки атомами Bi. Встановлено, що при розглянутих енергіях електрона від 1 до 6 МеВ, цікавих з точки зору електронного захисту апаратури в космічному просторі, втрати в основному визначаються іонізацією атомів, а не радіаційними втратами. Встановлено, що для енергії електронів 6 МеВ при товщині композиту до 0,8 см переважає коефіцієнт пропускання по числу електронів, а при товщині композиту більше 0,8 см починає переважати коефіцієнт пропускання електронів по енергії. Показано високу стійкість розробленого композиту по відношенню до потоку швидких електронів у загальному випадку їх падіння під різними кутами до нормалі поверхні мішені.Проведены теоретическая оценка взаимодействия быстрых электронов с полимерным полиимидным композитом, наполненным силикатом висмута, и расчеты по удельным потерям энергии электронов и коэффициентам пропускания. Показано, что больший вклад в ионизационные потери вносят атомы Bi, C и O, а радиационные потери практически обусловлены только атомами Bi. Установлено, что при рассматриваемых энергиях электрона от 1 до 6 МэВ, интересных с точки зрения электронной защиты аппаратуры в космическом пространстве, потери в основном определяются ионизацией атомов, а не радиационными потерями. Также определено, что для энергии электронов 6 МэВ при толщине композита до 0,8 см преобладает коэффициент пропускания по числу электронов, а при толщине композита более 0,8 см начинает преобладать коэффициент пропускания электронов по энергии. Показана высокая стойкость разработанного композита по отношению к потоку быстрых электронов в общем случае их падения под разными углами к нормали поверхности мишени

Peierls Instabilities in Quasi-One-Dimensional Quantum Double-Well Chains

Peierls-type instabilities in quarter-filled ($\bar{n}=1/2$) and half-filled ($\bar{n}=1$) quantum double-well hydrogen-bonded chain are investigated analytically in the framework of two-stage orientational-tunnelling model with additional inclusion of the interactions of protons with two different optical phonon branches. It is shown that when the energy of proton-phonon coupling becomes large, the system undergoes a transition to a various types of insulator states. The influence of two different transport amplitudes on ground states properties is studied. The results are compared with the pressure effect experimental investigations in superprotonic systems and hydrogen halides at low temperatures.Comment: 7 pages, RevTeX, 9 eps figure

Metacognitive knowledge monitoring under assessment of educational achievements

We present an empirical study, which tested the hypothesis about the impact of the situation of educational achievements assessment on metacognitive monitoring of students’ subject knowledge test performance. On a sample of 47 people (21 girls, 26 boys, mean age 15.5 years) we revealed that the characteristics of metacognitive monitoring (self-decision and the accuracy of metacognitive judgments) differ in a situation of educational achievements assessment and in its absence. We found that students with high and low achievement motivation show different metacognitive monitoring of the situation in the presence or absence of the estimation of educational achievements (p < 0,05). In conclusion, we discuss the use of the data and findings in the general psychological and psycho-pedagogical studies of metacognition, and in teaching practic

Dependences of the yield of common beans on agrotechnical factors in the zone of chestnut soils of the Astrakhan region

The article presents the results of agroecological study of the common bean collection, not only under the conditions of the subtype of light chestnut soils of the Astrakhan region, but also worked out the mode of irrigation of this crop, inoculation of seeds with rhizotorphin on a drip irrigation method. The need for research was primarily due to the insufficient number of bean varieties ideally adapted to the specific climatic conditions of the region, which is associated with insufficient study of both the morphology and biology of the culture. As objects of study, a test culture of beans and the drug rhizotorfin were chosen. The study showed that when cultivating common beans under irrigated Astrakhan region in the subzone of light chestnut soils, it is advisable to carry out pre-sowing inoculation of seeds with rhizotorphin, which ensures a stable yield of common beans on drip irrigation, and also contributes to the accumulation of biological nitrogen. Thus, based on the data obtained, on drip irrigation in the subzone of light chestnut soils, it is economically feasible to sow in a wide-row method (0.70 m) with a seeding rate of 500,000 germinating seeds per hectare and carry out pre-sowing seed inoculation with rhizotorphin

Adaptive Control System of an Electromagnetic Actuator for the Quickly Moving Flap of an Air-impulse-charging Internal Combustion Engine without using Position, velocity, or Acceleration Sensors

AbstractAn adaptive control algorithm of a fast electromagnetic actuator has been developed without using position, velocity, or acceleration sensors. The algorithm is based on the fluctuation rate of the current in the electromagnet coil, which is measured during anchor movement. The proposed method and control algorithm compensate for external mechanical factors and are based on the interconnection of electric processes in the electromagnetic actuator coil, with mechanical processes relating to the movement of the movable element of the magnetic system. A structural diagram of a hardware device and an algorithm that implement the proposed control method are presented for a resonance type electromagnetic actuator, where there is a current change in the coil of the electromagnetic actuator. At each switching of the drive, parameters are controlled, and the length of pulse-width-modulated pulses is adjusted to ensure reliable switching and regulation of the anchor end. The control system responds to the disturbance in the current switching cycle. To test the adequacy of the proposed algorithm, an experimental model of an actuator with the proposed control system has been constructed, and its characteristics have been studied. It has been found out that the proposed algorithm ensures the required performance in terms of the operation speed and the lowest speed of the anchor landing without using position, velocity or acceleration sensors under external mechanical effects