Near-field radiation patterns for an Ultra-Wide-Band antenna

We present a three-dimensional time dependent model for simulating the electromagnetic radiation field patterns generated by Ultra-Wide-Band (UWB) antennas. UWB antennas are pulsed mode radiators used to communicate information at high bit rates over short distances. This affects the spatial characteristics of the field patterns assumed to be generated when a Continuous Wave (CW) model is used and this paper investigates the differences between the near-field intensity patterns generated when a pulse and CW mode is used. The purpose of this is to develop a numerical simulation that provides information on the three-dimensional electromagnetic field subject to a known (integrated) antenna geometry. The context of the approach considered is the design of integrated antennas that extend the performance of UWB systems in terms of range (in the near-field) subject to emission standards

Technology of fabrication of CDSXTe1-X solid solution on silicon substrate

Heterojunction between Si and CdSxTe1-x have been obtained by vacuum deposition of powders of cadmium sulfide and cadmium telluride on the surface of monocrystalline silicon. The optimal temperature regime for the growth of the CdSxTe1-x solid solution on the silicon surface has been determined. The values of the crystal lattice constant and the thickness of the CdSxTe1-x solid solution at the interface of the n/Si − n/ CdSxTe1-x heterostructure are calculated

Dynamics of Dirac solitons in networks

We study dynamics of Dirac solitons in prototypical networks modeling them by the nonlinear Dirac equation on metric graphs. Stationary soliton solutions of the nonlinear Dirac equation on simple metric graphs are obtained. It is shown that these solutions provide reflectionless vertex transmission of the Dirac solitons under suitable conditions. The constraints for bond nonlinearity coefficients, conjectured to represent necessary conditions for allowing reflectionless transmission over a Y-junction are derived. The Y-junction considerations are also generalized to a tree and triangle network. The analytical results are confirmed by direct numerical simulations. Keywords: nonlinear Dirac equation, metric graphs, Lorentz transformation, Gross–Neveu model, Dirac solitons, reflectionless transpor

Technology of fabrication of CdSxTe1-x solid solution on silicon substrate

Heterojunction between Si and CdSxTe1-x have been obtained by the method of vacuum deposition of powders of cadmium sulfide and cadmium telluride on the surface of monocrystalline silicon. The optimal temperature regime for the growth of the CdSxTe1-x solid solution on the silicon surface has been determined. The values of the crystal lattice constant and the thickness of the CdSxTe1-x solid solution at the interface of the n/Si – n/CdSxTe1-x heterostructure are calculated

Peasant settlers and the ‘civilizing mission’ in Russian Turkestan, 1865-1917

This article provides an introduction to one of the lesser-known examples of European settler colonialism, the settlement of European (mainly Russian and Ukrainian) peasants in Southern Central Asia (Turkestan) in the late nineteenth and early twentieth centuries. It establishes the legal background and demographic impact of peasant settlement, and the role played by the state in organising and encouraging it. It explores official attitudes towards the settlers (which were often very negative), and their relations with the local Kazakh and Kyrgyz population. The article adopts a comparative framework, looking at Turkestan alongside Algeria and Southern Africa, and seeking to establish whether paradigms developed in the study of other settler societies (such as the ‘poor white’) are of any relevance in understanding Slavic peasant settlement in Turkestan. It concludes that there are many close parallels with European settlement in other regions with large indigenous populations, but that racial ideology played a much less important role in the Russian case compared to religious divisions and fears of cultural backsliding. This did not prevent relations between settlers and the ‘native’ population deteriorating markedly in the years before the First World War, resulting in large-scale rebellion in 1916

Солітонні та періодичні розв'язки у вигляді хвиль навантаженого модифікованого рівняння Бенджаміна-Бона-Махоні методом функціональної змінної

In this article, we established new travelling wave solutions for the loaded Benjamin-Bona-Mahony and the loaded modified Benjamin-Bona-Mahony equation by the functional variable method. The performance of this method is reliable and effective and gives the exact solitary wave solutions and periodic wave solutions. All solutions of these equations have been examined and three dimensional graphics of the obtained solutions have been drawn by using the Matlab program. We get some traveling wave solutions, which are expressed by the hyperbolic functions and trigonometric functions. This method is effective to find exact solutions of many other similar equations.У статті ми отримуємо нові розв'язки у вигляді біжучих хвиль для навантажених і модифікованих навантажених рівнянь Бенджаміна-Бона-Махоні методом функціональної змінної. Метод є надійним і ефективним, і є точним у випадку, коли розв'язки є солітонними або періодичними хвилями. Всі розв'язки цих рівнянь були дослiдженi, і  за допомогою Matlab були побудовані тривимірні графіки отриманих розв'язків. Ми отримуємо деякі розв'язки у вигляді біжучих хвиль, які представлені за допомогою гіперболічних і тригонометричних функцій. Цей метод є ефективним для знаходження точних розв'язків багатьох інших схожих рівнянь

KICKED PARTICLE TRANSPORT IN ARMCHAIR GRAPHENE NANORIBBONS

In this paper we discuss the study of charge transport in an armchair graphene nanoribbon drivenby an external time-periodic kicking potentia

SOLITON MECHANISM OF CHARGE TRANSPORT IN BRANCHED CONDUCTING POLYMERS AND VERIFICATION OF CONSERVATION LAWS

In this work we consider the modeling of charge transport processes in branched conducting polymers and verification of conservation laws, such as energy and charge conservation

Technology and machine tape preparation soil for seeding

Mutual arrangement is a combined machine that performs strip preparation of the soil for sowing. The scheme and the functional scheme of the combined machine are given. Analytical dependences and mathematical models for determining the distance between the support wheels are obtained. In this case, the methods of theoretical and classical mechanics are used. To conduct experimental studies, a strain gauge laboratory and field installation has been developed with the possibility of changing the sheet casing, the ripper, and the main housings. Machines were determined in experiments. The plowshare of the lister housing and the ripper of at least 40 cm, between the main body and the lister housing of at least 70 cm, high-quality soil preparation for sowing melons of the required degree with minimal traction resistance