Total number
Full text
Total number
Full text
Number of local repositories
Full text
0223U000925,
0122U001428
,
Formation and transformation of harmonic and non-stationary electromagnetic fields by multi-element structures of electric and magnetic type radiators using nonlinear elements
Berdnyk Serhii L., Доктор фізико-математичних наук
21-01-2023
V.N. Karazin Kharkiv National University
The purpose of the work is the further development of numerical analytical methods for solving boundary value problems of electrodynamics with nonlinear boundary conditions for multi-resonant, multi-element radiating structures; building on their basis adequate mathematical models of emitters of various types; conducting effective multi-parameter modeling to determine the physical properties of radiating structures with new and improved functional characteristics for various fields of application; development of the nonlinear theory of systems for collecting, controlling and converting electromagnetic energy into direct current (reconfigured rectens) and determining the physical properties of reconfigured rectens for further improvement and implementation of technologies for the construction of alternative energy sources. The problem of diffraction of electromagnetic waves on a system of resonators in a rectangular waveguide connected by diaphragms with resonant slots is solved using the generalized method of the induced magnetomotive forces. A mathematical model for a Klevin radiator with a transverse slot in a wide wall of a rectangular waveguide and impedance monopoles is constructed. A pulsed ultra-broadband radiator of electric and magnetic type, an analogue of the Klevin emitter, has been developed, in which the necessary characteristics are provided by the strong interaction of its constituent parts. Optimization of its parameters and a comprehensive analysis of the directional, frequency and time characteristics of such radiator were carried out. A mathematical model of the excitation of an open micro-resonator in the form of a dielectric rod with a finite lattice of surface rectangular-cylindrical emitters made of graphene, located on the surface of a circular dielectric cylinder, was constructed. A mathematical model of reconfigurable rectennas has been constructed and practical recommendations for designing reconfigurable rectennas used in various wirele
Gomozov Andriy V.
Hretskykh Dmytro V.
Dumin Oleksandr M.
Katrych Viktor О.
Nesterenko Mykhailo V.
Svezhentsev Oleksandr Ye.
2023-01-21
Updated: 2025-12-28
Saving a scientific data set occurs in two stages:
1.) Creating a data set
Enter the name of the set, a brief description of the set (annotation), and click the “Create set” button. After that, a draft data set will be automatically created, which you can save for further work with the set. The system will redirect you to the “Data set information” page.
2.) Filling in the data
On the “Data set information” page, you need to fill in all the fields related to the data set and upload the files.
Please note! Each file is uploaded separately. This is done to ensure the stable operation of the system.
Once you have filled in the information about the scientific data set and added the necessary files, you can save the draft or send the data to the system.
Please note! Once the data has been sent, you cannot change it.
Drafts are necessary for storing the data set and editing it before sending.
All accounts on the NRA website go through a standard registration procedure and are verified. However, in order to obtain additional features, such as publishing open reviews of academic texts, verification by affiliation is required.
To obtain the status “verified”, you must change your primary email address to a corporate one, which is tied to a scientific or educational institution.
For example: user@ukrintei.ua, user@nas.gov.ua
After confirming your corporate email address, your account will be automatically verified by affiliation.
If your email address is corporate, but your account does not have a verification mark, you need to write to us at the email address NRAT@ukrintei.ua. After verification, we will add your address to the database, and your account will be verified.
After completing the verification procedure for affiliation, you can change the primary email address to a convenient one for you, without losing your status during the current verification.
You only need to verify for affiliation once.
* We use corporate addresses from the Unified State Database on Education and the State Register of Scientific Institutions Supported by the State
To search for news published on the official website of NRАT in the “News” section, you need to enter one word, several words, or an exact phrase in the search field. Different terms are separated by spaces.
The search is performed everywhere – in the title and the news text.
For a more comprehensive result, it is recommended to use word stems (parts of words without endings).
When using multiple words for the search, they are combined using one of the logical methods described below.
By default, the logical connector “and” is used. In this case, search results will include all news releases that contain the specified words, even if they are located separately from each other and are in different parts of the text.
Example: Search phrase: OECD report. Search result: all news containing the words “report” and “OECD” in the text and in the title, both together and separately.
If a phrase or phrase is enclosed in quotation marks (“), the results will include all publications where this exact phrase or phrase is found.
Example: Search phrase: “OECD report.” Search result: all news containing the exact phrase “OECD report.”
If you know the publication date of the news or are interested in a specific time frame in which they were published on the website, you can select such a date or date range in the additional field that looks like a calendar. The date is entered in the format year-month-day and confirmed by clicking on the corresponding date in the calendar dropdown. You can enter a date or choose one by browsing through the calendar by months and years. By default, the interval starts from the oldest date (2018-01-23) and ends with the current date.
You can also use one or more hashtags, which are located under the search field on the right side of the “News” page.
Please note: The search for academic texts is carried out in a separate search window at the following link https://nrat.ukrintei.ua/searchdb.
