Solitary electromagnetic waves propagation in the asymmetric oppositely-directed coupler

We consider the electromagnetic waves propagating in the system of coupled waveguides. One of the system components is a standard waveguide fabricated from nonlinear medium having positive refraction and another component is a waveguide produced from an artificial material having negative refraction. The metamaterial constituting the second waveguide has linear characteristics and a wave propagating in the waveguide of this type propagates in the direction opposite to direction of energy flux. It is found that the coupled nonlinear solitary waves propagating both in the same direction are exist in this oppositely-directed coupler due to linear coupling between nonlinear positive refractive waveguide and linear negative refractive waveguide. The corresponding analytical solution is found and it is used for numerical simulation to illustrate that the results of the solitary wave collisions are sensible to the relative velocity of the colliding solitary waves.Comment: 9 pages,5 figure

Chemistry for engineering education

We will look at the practical implementation of the disciplines of chemistry intechnological orientation programs. It is shown that with the uniformrequirements of the GEF to the quality of training, volumes for disciplines ofchemistry differ significantly. These shortcomings inherent in the existingteaching methods and ways to improve the learning process are discussed. Notedthat the promising direction of the basic educational program is to build themin a modular fashion.Рассмотрена практика реализации дисциплин химии в программах технологической направленности. Показано, что при единых требованиях ФГОС к качеству подготовки специалистов объемы дисциплин химии существенно различаются. Указаны недостатки, присущие существующей методике обучения, и рассмотрены пути повышения эффективности учебного процесса. Отмечено, что перспективным направлением реализации ООП является построение их по модульному принципу

Assessment of the reliability of the locomotive based on statistical methods of quality management

The lack of reliability of the diesel locomotive operation leads to a decrease in the technical and economic efficiency of using the locomotive service of the enterprise. During the experiment which aimed at assessing the reliability of repair and maintenance of a diesel locomotive in one of the railway divisions of OJSC "Russian Railways", it was found that the failures may be distributed by types of equipment, based on the failures for 12 months of 2017. Statistical quality management methods were used to identify the most problematic types of locomotive equipment and specific causes of failures. © Published under licence by IOP Publishing Ltd

High frequency polarization switching of a thin ferroelectric film

We consider both experimentally and analytically the transient oscillatory process that arises when a rapid change in voltage is applied to a $Ba_xSr_{1-x}TiO_3$ ferroelectric thin film deposited on an $Mg0$ substrate. High frequency ($\approx 10^{8} rad/s$) polarization oscillations are observed in the ferroelectric sample. These can be understood using a simple field-polarization model. In particular we obtain analytic expressions for the oscillation frequency and the decay time of the polarization fluctuation in terms of the material parameters. These estimations agree well with the experimental results

THE INCIDENCE RATE ANALYSIS OF BLADDER CANCER IN THE KRASNODAR REGION IN 2003-2012

The tendency of bladder cancer incidence in Krasnodar region in 2003- 2012 is analyzed in article. The intensive and standardized coefficients of cancer cases are calculated on the basis of population data of the cancer register about 5312 patients with bladder cancer of studied localization. The incidence rate analysis depending on age and a residence (urban or country people) is presented here. Territorial distribution of bladder cancer on the basis of the cartographical analysis is also research

Mandatory certification in China

Китай является второй экономикой мира и крупнейшим импортером и экспортером продукции. Сведения о системе обязательной сертификации, действующей в Китае и распространяющейся как на произведенную в Китае, так и на введенную продукцию в Китай весьма актуальны. В статье рассмотрены основные положения системы обязательной сертификации, действующей в КитаеChina is the world's second largest economy and largest importer and exporter. Information about the system of mandatory certification of operating in China and spread as produced in China and introduced products to China is very relevant. The article describes the main provisions of the sys-tem of mandatory certification of operating in Chin

The level of compliance of Russian and European rails standards on groups of indicators: the design and dimensions of rails

It is proved that the level of compliance of national and international standards determines the competitiveness of products. GOST R 51685–2013 «Railway rails. General technical conditions» is a new stage in the struggle for the competitiveness of domestic rails. The level of compliance of requirements imposed on the rails in the national standard GOST R 51685–2013 and the European Standard EN 13674–1–2011on the group of indicators: design and dimensions of the rails on the four-point of scale comparison is comparedДоказывется, что уровень соответствия требований национальных и международных стандартов определяет конкурентоспособность продукции. Утверждается, что ГОСТ Р 51685–2013 «Рельсы железнодорожные. Общие технические условия» – новая ступень в борьбе за конкурентоспособность отечественных рельсов. Сравнивается уровень соответствия требований, предъявляемых к рельсам, в национальном стандарте ГОСТ Р 51685–2013 и европейском стандарте EN 13674–1–2011, по группе показателей: конструкция и размеры рельсов по четырехбалльной шкале сравнени

Electromagnetically induced switching of ferroelectric thin films

We analyze the interaction of an electromagnetic spike (one cycle) with a thin layer of ferroelectric medium with two equilibrium states. The model is the set of Maxwell equations coupled to the undamped Landau-Khalatnikov equation, where we do not assume slowly varying envelopes. From linear scattering theory, we show that low amplitude pulses can be completely reflected by the medium. Large amplitude pulses can switch the ferroelectric. Using numerical simulations and analysis, we study this switching for long and short pulses, estimate the switching times and provide useful information for experiments