Ignition of premixed air/fuel mixtures by microwave steamer discharge

A variety of methods exists for fast and efficient combustion of air-fuel mixtures. In this study, a microwave subcritical streamer discharge is used to ignite propane-air mixtures at atmospheric pressure. The streamer is initiated at the inner surface of a dielectric tube with the help of a passive half-wave vibrator. By creating a network of ignition lines, the streamer discharge forms the network of burning channels with large total surface area. This leads to the apparent speed of combustion propagation along the cylinder in excess of 100 m/s, which is more than 200 times the laminar flame propagation speed. The axial propagation of the combustion front in a cylindrical tube filled with the air/propane mixture is investigated by high speed video recording in visible light. A simple model is presented to explain observed results

SCHOOL PROBLEMS IN THE EDUCATION AND DEVELOPMENT OF GIFTED CHILDREN: PSYCHOLOGICAL ASPECT

Purpose of the Study: The urgency of the problem under investigation is due to the fact that the issue of gifted students’ education is one of the most difficult and interesting aspects of contemporary pedagogy. The purpose of the article is to identify the psychological characteristics of the gifted students’ development. In this article, the school difficulties of gifted students are revealed and the causes of internal and external nature are analyzed. The authors pay special attention to the social and emotional consequences, which can be rather destructive if appropriate assistance is not provided by teachers, psychologists, and parents. Methodology: The leading approach to the study of this problem is a method of theoretical analysis and synthesis of social, political and psycho-pedagogical literature. Results: The main result of the study is a theoretical analysis of the relationship between learning and the development of gifted children and their psychological characteristics. Application: The materials of the article can be useful for teachers, students and a wide range of readers interested in the problems of gifted students’ education

SCHOOL PROBLEMS IN THE EDUCATION AND DEVELOPMENT OF GIFTED CHILDREN: PSYCHOLOGICAL ASPECT

Purpose of the Study: The urgency of the problem under investigation is because, the issue of gifted students’ education is one of the most difficult and interesting aspects of contemporary pedagogy. The purpose of the article is to identify the psychological characteristics of the gifted students’ development. In this article, the school difficulties of gifted students are revealed and the causes of internal and external nature are analyzed. Methodology: The leading approach to the study of this problem is a method of a theoretical analysis and synthesis of social, political, and psycho-pedagogical literature. Results: The main result of the study is a theoretical analysis of the relationship between learning and the development of gifted children and their psychological characteristics. Application:The materials of the article can be useful for teachers, students, and a wide range of readers interested in the problems of gifted students’ education. The authors pay special attention to the social and emotional consequences, which can be rather destructive if appropriate assistance is not provided by teachers, psychologists, and parents

ENVIRONMENTALLY FRIENDLY METHOD OF GASEOUS FUEL COMBUSTION WITH THE USE OF QUASI-OPTICAL MICROWAVE

Subject of Research.The paper deals with the problem of developing low emission combustors operating on natural gas or LPG, to reduce emissions of nitrogen oxides NOx. The possibility of burning very lean fuel mixtures is studied. To initiate the ignition and combustion stabilization the discharge generated by the quasi-optical microwave is used. Main Results. Initiating ignition by streamer microwave discharge increases the rate of combustion and combustion efficiency about four times as compared with the conventional spark ignition. Streamer discharge ignition by very lean fuel-air mixture is demonstrated with the factor of oxiding agent excess greater than the limit of explosive range under normal conditions. According to indirect indicators, ignition by microwave discharge created by quasi-optical radiation is of non-thermal nature. Microwave discharge excites oxygen atoms, and intense ultra-violet radiation is generated as a result that causes formation of cold nonequilibrium plasma with avalanche growth of free electrons. Streamer discharge propagates at a speed of 5 km /s, so the initiation of the ignition occurs immediately throughout. The temperature of the fuel mixture at the point of ignition initiation does not exceed 400 К.There is no area with a temperature sufficient to initiate thermal Zeldovich mechanism of emission of nitrogen oxides. Combustion rate is high. As a result the Fenimore mechanism of "fast nitrogen oxides" has no chance to be progressing, and NOx emissions in appreciable quantities are excluded. Energy costs are comparable with spark ignition.Practical Relevance. The studied technology is designed for low emission internal combustion engines, power gas turbines, gas compressor units, fueled by natural gas

TO THE PROBLEM OF STUDYING THE ETHICAL CHARACTERISTICS OF THE PERSON

Purposes: The crisis in modern humanitarian science testifies to the need to search for a new approach that goes beyond the boundaries of the natural-science approach, which in its turn involves addressing to the origins of our culture, expanding the categorical apparatus and methodological basis of psychology. In individual consciousness, the spiritual crisis is expressed in the loss of the ideals of life. Therefore, at the present stage of the development of society, the need for a philosophical and psychological analysis of spiritual and moral ideas and their role in the formation of the individual is felt with particular severity. Methodology: In the framework of the activity approach embodied in the works of S. L. Rubinstein, the main provisions were formulated, which are of special methodological importance for the solution of this problem. In particular, these are provisions on the study of the human psyche through its manifestations in the main types of activity and the influence on the activities of external causes, not directly, but indirectly, through its internal, psychological conditions. Results: This article is devoted to the description of the results of an empirical study carried out from the position of the activity approach and aimed at revealing the level of ethical behavior of adolescence and youth ages. The urgency of the study is due to the fact that the tendency of the transition from the theoretical-descriptive to the experimental-developing technology of research of ethical characteristics is clearly manifested in the work. Implications/Applications: This article could be practical in predicting the problems regarding the study of Ethical Characteristics of person and help the audience to broaden their information in this vein. Novelty/Originality: In one case, the individual in the process of communicating with other people, assimilates universal values, the experience of moral relations, develops beliefs and moral ideals, in the other can under the influence of communication become attached to completely opposite values, degrade morall

Bulk Nanocrystalline Thermoelectrics Based on Bi-Sb-Te Solid Solution

A nanopowder from p-Bi-Sb-Te with particles ~ 10 nm were fabricated by the ball milling using different technological modes. Cold and hot pressing at different conditions and also SPS process were used for consolidation of the powder into a bulk nanostructure and nanocomposites. The main factors allowing slowing-down of the growth of nanograins as a result of recrystallization are the reduction of the temperature and of the duration of the pressing, the increase of the pressure, as well as addition of small value additives (like MoS2, thermally expanded graphite or fullerenes). It was reached the thermoelectric figure of merit ZT=1.22 (at 360 K) in the bulk nanostructure Bi0,4Sb1,6Te3 fabricated by SPS method. Some mechanisms of the improvement of the thermoelectric efficiency in bulk nanocrystalline semiconductors based on BixSb2-xTe3 are studied theoretically. The reduction of nanograin size can lead to improvement of the thermoelectric figure of merit. The theoretical dependence of the electric and heat conductivities and the thermoelectric power as the function of nanograins size in BixSb2-xTe3 bulk nanostructure are quite accurately correlates with the experimental data.Comment: 35 pages, 24 figures, 4 tables, 52 reference

MultiPoseNet: Fast Multi-Person Pose Estimation using Pose Residual Network

In this paper, we present MultiPoseNet, a novel bottom-up multi-person pose estimation architecture that combines a multi-task model with a novel assignment method. MultiPoseNet can jointly handle person detection, keypoint detection, person segmentation and pose estimation problems. The novel assignment method is implemented by the Pose Residual Network (PRN) which receives keypoint and person detections, and produces accurate poses by assigning keypoints to person instances. On the COCO keypoints dataset, our pose estimation method outperforms all previous bottom-up methods both in accuracy (+4-point mAP over previous best result) and speed; it also performs on par with the best top-down methods while being at least 4x faster. Our method is the fastest real time system with 23 frames/sec. Source code is available at: https://github.com/mkocabas/pose-residual-networkComment: to appear in ECCV 201

Features of cytokines production in prematurely born infants with community-acquired pneumonia

There are no enough data about the features of inflammatory reactions development in premature children in the first year of life with different infectious diseases including pneumonia. The aim of the study is to determine clinical and diagnostic importance of interleukin-1β and interleukin-10 levels in blood serum to estimate the level of severity of pneumonia in children in the first year of life who were born with a very low body were weight. We have examined 85 premature infants from 1 month old to one year old. The first group consisted of conditionally healthy premature infants (n = 22), the second group – of premature infants with clinical signs of community-acquired pneumonia (n = 63). The examination included the definition of the levels of populations and subpopulations of immunocompetent cells (СD3+, CD4+, CD8+, CD22+) and interleukin-1β and interleukin-10 in serum. The research showed the domination of a respiratory syndrome, the symptoms of respiratory insufficiency of the II and III stages, the intoxication signs without the temperature reaction in the clinical picture of community-acquired pneumonia of the majority of one-year-old children born with a very low body weight. Community-acquired pneumonia is characterized by a significant decreasing of the most functionally active CD3+, CD4+ and CD22+ lymphocytes in premature infants of the first year of life. The low levels of IL-1β (19.40 ± 2.42 pg/ml) and IL-10 (23.30 ± 1.56 pg/ml) in infants with community-acquired pneumonia confirm the immaturity of the immune system of children with a very low body weight. The diagnostic data of the significance of interleukins-1β and 10 levels in children of the first year of life with community-acquired pneumonia born with a very low weight have been received

Combustion of lean fuel mixtures with subcritical streamer microwave discharge

A sub-critical microwave discharge is used to achieve a stable ignition and combustion of lean air-fuel mixtures in a long tube. The microwave discharge is burnt at the presence of initiator with the quasi-optical microwave beam. The resonance way of initiation of a microwave discharge is more effective compared to traditional plasma-assisted ways of ignition and stabilization of combustion. The experimental observations show that ignition and combustion of a lean air and propane mixture in a long tube is achieved at low ignition limit with fuel/air ratio lower than 0.55. The results obtained are useful for design of new and improvement of the existing plasma-assisted technologies in aviation industry