756 research outputs found
Empowering end-users in the energy transition: An exploration of products and services to support changes in household energy management
No full textCurrent discourse on smart grid deployment expects residential end users to play a more active role as co-providers in the electric power system. Their electricity consumption and production is considered a resource for balancing supply and demand in an electric power system with distributed generation. This means that, in addition to using energy efficiently, they, for example, have to adjust their consumption patterns to the production patterns of locally available and intermittent energy generation. This thesis explores how the technological and social contexts of smart grids can shape the role of residential end-users as co-providers in the electric power system. The main objective was to formulate implications for the development of products and services that support end-users in taking up a co-provider role. The research involved a literature review about currently applied smart grid technologies and field studies of two pilot projects in which households were equipped with smart energy technology: Energy Battle and PowerMatching City. Both cases concern the implementation of a product-service combination that was new for the household and that was aimed at enabling one or more aspects of co-providing end-user behavior. End-users’ experiences in using the implemented system were central to the research in each case. The research resulted in design implications within four themes: (1) Design of the user interface, (2) Design in relation to the social context at household and community level, (3) Integral design approach to address behavioral and technical aspects of smart energy system performance, and (4) Design of products and services as part of an experiential learning process for both developers and end-users.Design Engineering / Design for SustainabilityIndustrial Design Engineerin
Неполный метод Галеркина в задаче моделирования локально-нерегулярных оптических волноводов
No full textThe work is dedicated to the solving of waveguiding problem for plane two-dimensional locally irregular waveguide using reduced Galerkin's method.Работа посвящена решению волноводной задачи в случае плоского двумерного локально-нерегулярного волновода неполным методом Галеркина
The Implementation of the Symbolic-Numerical Method for Finding the Adiabatic Waveguide Modes of Integrated Optical Waveguides in CAS Maple
No full textComputational problems of electrodynamics require an approximate solution of the system of Maxwell’s vector equations for regions with different geometries. The main methods for solving problems with the Maxwell equations are either finite difference methods or methods based on the Galerkin and Kantorovich expansions, or the finite element method. Each of the classes of methods is characterised by a wide range of permissible objects, but in each of the methods, the solution contains a large number of quantities known only in numerical form. We have chosen a different approach, in which to describe the waveguide propagation of electromagnetic radiation we propose using the model of adiabatic waveguide modes. This model allows reducing Maxwell equations to a system of ordinary differential equations, which allows analysis of its solutions at the symbolic level. A fundamental system of solutions of the system is constructed in symbolic form. A numerical method for computing the guided modes of a planar three-layer open waveguide is formulated and implemented using a vector model of the adiabatic waveguide modes. Phase constants calculated in the framework of the model of adiabatic waveguide modes were verified by comparison with those calculated in the framework of the scalar model. © 2019, Springer Nature Switzerland AG
Символьно-численное моделирование вытекающих мод в регулярном однородном открытом волноводе
No full textMultilayer planar waveguides are used in many devices of modern photonics and optoelectronics. Due to the complex structure of such devices, the main method used at the design and optimization stage is symbolic-numerical simulation. This paper presents a simulation of the propagation of a leaky TE-mode in a flat three-layer dielectric waveguide. The simulation algorithm of the propagation of a leaky TE-mode includes finding eigenvalues and eigenfunctions of a mode. In this work, we used the wave coupling method, separation of variables method, Hook-Jeeves method and a modified Gauss method. During the development of this algorithm, the areas of shadow in the top layer and the substrate were taken into account. As a result, the propagation process of the y electric field vector component was simulated. These results can be used to simulate the propagation of the entire electromagnetic field, as well as to solve other classes of waveguide modes. The implemented symbolic-numerical solution method can also be applicable to other waveguide structures with an arbitrary number of layers. The described algorithm of symbolic-numerical simulation is implemented in the system of computer algebra Maple.Многослойные планарные волноводы применяются во многих устройствах современной фотоники и оптоэлектроники. Ввиду сложной структуры таких устройств основным методом, применяемым на этапе разработки и оптимизации, является символьно-численное моделирование. В настоящей работе представлено моделирование распространения вытекающей ТЕ-моды в плоском трёхслойном диэлектрическом волноводе. Алгоритм моделирования распространения вытекающей ТЕ-моды включает в себя нахождения собственных значений и функций моды. В работе были использованы методы волнового сопряжения, разделения переменных, Хука-Дживса и модифицированный метод Гаусса. При разработке данного алгоритма были учтены области тени в покровном слое и подложке. Данные результаты могут быть использованы для моделирования распространения всего электромагнитного поля, а также для решения других классов волноводных мод. Реализованный символьно-численный метод решения также может быть применим и к другим волноводным структурам с произвольным количеством слоев. Описанный алгоритм символьно-численного моделирования реализован в системе компьютерной алгебры Maple
Распространение поляризованного монохроматического света в периодических структурах
No full textThe work is dedicated to analysis of photonic band gaps of one-dimensional photonic crystal and simulating diffraction on one-dimensional binary diffraction grating using RCWA method. The results of simulating diffraction using RCWA are compared with spectrophotometrical data.Работа посвящена анализу запрещённых зон одномерного фотонного кристалла и моделированию дифракции света на одномерной бинарной дифракционной решётке методом RCWA. Метод RCWA описан для одномерных фотонных кристаллов и одномерных бинарных дифракционных решёток. Приведено сравнение результатов моделирования со спектрофотометрическими данными
Моделирование прохождения световой волны через открытый планарный волновод методом "ящика Дирихле"
No full textThis paper describes the process of calculation of transversal distribution of waveguiding modes intensivity which come through open thin-film planar waveguide placed in “Dirichlet box”.В работе описывается метод расчёта направляемых и излучательных волноводных мод в открытых тонкоплёночных планарных волноводах, помещенных в «ящик Дирихле»
Моделирование прохождения световой волны через открытый планарный волновод методом "ящика Дирихле"
No full textThis paper describes the process of calculation of transversal distribution of waveguiding modes intensivity which come through open thin-film planar waveguide placed in “Dirichlet box”.В работе описывается метод расчёта направляемых и излучательных волноводных мод в открытых тонкоплёночных планарных волноводах, помещенных в «ящик Дирихле»
Symbolic Investigation of Eigenvectors for General Solution of a System of ODEs with a Symbolic Coefficient Matrix
No full textAbstract: This paper investigates the problem of symbolic representation for the general solution of a system of ordinary differential equations (ODEs) with symbolically defined constant coefficients in the case where some symbolic constants can vanish. In addition, the symbolic representation of eigenvectors for the system’s coefficient matrix is not unique. It is shown that standard procedures of computer algebra systems search for specific symbolic representations of eigenvectors while ignoring the other symbolic representations. In turn, the eigenvectors found by a computer algebra system can be inadequate for constructing numerical algorithms based on them, which is demonstrated by an example. We propose an algorithm for finding various symbolic representations of eigenvectors for symbolically defined matrices. This paper considers a particular system of ODEs obtained by investigating some solutions of Maxwell’s equations; however, the proposed algorithm can be applied to an arbitrary system with a normal matrix of coefficients. © 2021, Pleiades Publishing, Ltd
Application of an incomplete Galerkin method to an irregular junction in open planar waveguides
No full textSummary: "The work is dedicated to the application of incomplete Galerkin method to the electromagnetic problem in closed homogeneous waveguide, presented as irregular junction between two waveguides with constant transverse sections. The method is generalized to the electromagnetic problem in open irregular homogeneous waveguide (in case of discrete modes only).
Symbolic Investigation of the Spectral Characteristics of Guided Modes in Smoothly Irregular Waveguides
No full textAbstract: This paper considers a homogeneous system of functional equations that occurs when solving a spectral problem the eigenfunctions of which describe guided modes of smoothly irregular waveguides. The resulting system of functional equations is a homogeneous system of algebraic equations for any fixed argument. A symbolic method for solving systems of functional equations of this type is proposed. The method is implemented in the Maple computer algebra system. Results of numerical computations are presented to demonstrate the effectiveness of the developed symbolic-numerical method in comparison with the approach based on only numerical techniques. © 2022, Pleiades Publishing, Ltd
- …
