Pribory i Metody Izmerenij

Antennas play a fundamental role in modern communication systems by facilitating signal transmission and reception across various frequency bands. Each antenna is designed for specific applications based on its operating frequency range. Whether deployed for Car-to-Car Communication or military operations, antennas serve critical functions, with information security being paramount in military contexts. Vehicular antennas typically operate within the L Band, approximately 1 to 2 GHz, relying on satellites for signal communication. However, traditional transmission through the ionosphere faces limitations, notably the skip zone, where signal reception is hindered, leading to communication failures. To address this limitation, Near Vertical Incident Skywave (NVIS) communication has been developed. NVIS utilizes antennas with very high (&gt; 75°) radiation angles and low HF frequencies to overcome skip zone challenges. Despite existing research efforts, achieving high radiation efficiency remains a challenge, often due to improper antenna angle settings. Additionally, previous studies have overlooked the importance of narrow beam focusing, crucial for long-range communication and direction finding. This paper aims to enhance antenna performance parameters such as efficiency and gain through the adoption of specific techniques. By optimizing antenna design and configuration, we aim to improve performance for ionospheric communication, particularly in military applications involving data and voice transmission.

Amit K. Mishra

Dipak P. Patil

Devices and Methods of Measurements

Review on HF Band Vehicular Antenna with NVIS Communication

HF频段车载天线与NVIS通信综述

Semiconductor materials based on ZnO and RE 3+ MnO 3 oxides are considered as potential candidates for spintronics. This article presents the methodology and results of studying the effect of magnetic circular dichroism for Zn 1-x Co x O, Zn 1-x-y Co x Al y O and RE 1-x 3+ A x 2+ MnO 3 film structures in the visible radiation range. It has been shown that the magnetic circular dichroism behavior of the manganite films reflects not only the magnetic, but also the charge component of the material. This indicates the possibility of studying the magnetic and transport characteristics of the films using the magnetic circular dichroism spectroscopy. Since the magnetic circular dichroism effect also directly probes the ground and excited electronic states of the film, it has been obtained data that update calculated parameters for describing the manganites band structure. In the case of the Zn 1-x Co x O and Zn 1-x-y Co x Al y O films, the magnetic circular dichroism spectroscopy acts as a tool for detecting Co nanoparticles in the solid solution matrix of ZnO:Co and ZnO:(Co+Al).

Yu. E. Samoshkina

A. V. Chernichenko

Magnetic Circular Dichroism of Oxide Films: Study of Electronic, Magnetic and Charge States

氧化物薄膜的磁圆二色性：电子、磁性和电荷态的研究

The article presents an apparatus for generating an air plasma jet "ALOE". The device differs from known analogues in its compactness achieved due to absence of need to use inert gases (because they are replaced by ambient air) and the ability to determine the exposure dose. In terms of its characteristics this new product corresponds to world standards. There are no domestic analogues of it. Parameters and examples of using this device are presented. It will be in demand for healthcare, veterinary medicine, and cosmetology. The device can be used for disinfection of surfaces, including heat-sensitive ones, such as living tissues, and can serve as a prototype for development of various physiotherapeutic devices.

A. V. Kazak

L. V. Simonchik

Air Plasma Jet Generation Apparatus "ALOE" A.V. Kazak, L.V. Simonchik

空气等离子体射流发生装置“ALOE” A.V. Kazak, L.V. Simonchik

Kinetic indentation is widely used to measure physical and mechanical properties of materials as one of the most universal methods for non-destructive testing. This paper uses the latest advances in artificial intelligence and capabilities of the Python programming language libraries allowing to carry out accurate measurements of cast iron hardness based on the data of the material’s micro-impact loading diagram. It has been shown that use of machine learning allows eliminating gross errors and reducing the error of indirect hardness evaluation in several times – down to 10 units according to Brinell HB. It has also been established that formation of additional features for training models (based on traditionally used characteristics: penetration depths, indenter movement speed and contact forces at certain points in time) has a positive effect on the accuracy of measurements, but amount of measurements should also be optimized. Feasibility of effective use of machine learning to evaluate hardness has been demonstrated by comparing of calculated hardness values with data obtained with standard testing methods. Advantage of the developed testing method is the fact that the developed algorithms can be used for prompt diagnostics of cast iron hardness using existing equipment. It is appropriate to extend the proposed approach for determination of other mechanical properties of cast iron: yield strength, strain hardening index, creep, relaxation, determined by indentation methods.

A. Yu. Kutsepau

A. P. Kren

A. V. Nikiforov

N. K. Tursunov

Application of Artificial Intelligence Technology for Prompt Diagnosis of Cast Iron Mechanical Properties

人工智能技术在铸铁力学性能快速诊断中的应用

Currently, it is relevant to create moving objects orientation systems based on the integration of various types of primary information sensors. One way to solve the orientation problem is to use the TRIAD (Tri-Axial Orientation Determination) method which allows determining the matrix of direction cosines between two coordinates. The traditional TRIAD force method is based on the use of two reference vectors – of gravitational and geomagnetic fields, measured by accelerometers and magnetometers, respectively. The disadvantage of this method is – appearance of additional deviations during the accelerated movement of the object and influence of primary information sensors’ random errors. Modified TRIAD method which is based on measurements of three triads of sensors: magnetometers, accelerometers and gyroscopes was proposed in the article. Estimates of acceleration vectors of gravitational and geomagnetic fields were calculated taking into account gyroscope measurements. Then these estimates were combined with the accelerometers’ and magnetometers’ data. The complex gravitational and geomagnetic fields’ accelerations were used to form the direction cosine matrix by the TRIAD method. The suggested modified method can be used to implement free-form moving objects’ orientation systems, since it is 6–8 times more accurate compared to the classic TRIAD method. Attenuation of random sensor errors and disturbances due to object acceleration can be adjusted by use of weigh factors.

Abbreviation	Prib. metody izmer.
Journal Impact	0.38
Quartiles(Global)	INSTRUMENTS & INSTRUMENTATION(Q4)

Publication Information	Publisher: Belarusian National Technical University，Publishing cycle: ，Journal Type: journal，Open Access Journals: Yes
Basic data	Year of publication: 2010，Proportion of original research papers: 96.77%，Self Citation Rate:50.00%， Gold OA Rate: 98.92%
Average review cycle	8 weeks

Pribory i Metody Izmerenij

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Review on HF Band Vehicular Antenna with NVIS Communication

Magnetic Circular Dichroism of Oxide Films: Study of Electronic, Magnetic and Charge States

Air Plasma Jet Generation Apparatus "ALOE" A.V. Kazak, L.V. Simonchik

Application of Artificial Intelligence Technology for Prompt Diagnosis of Cast Iron Mechanical Properties

Modified TRIAD Method for Solving the Problem of a Moving Object Orientation

Review on HF Band Vehicular Antenna with NVIS Communication

Magnetic Circular Dichroism of Oxide Films: Study of Electronic, Magnetic and Charge States

Air Plasma Jet Generation Apparatus "ALOE" A.V. Kazak, L.V. Simonchik

Application of Artificial Intelligence Technology for Prompt Diagnosis of Cast Iron Mechanical Properties

Modified TRIAD Method for Solving the Problem of a Moving Object Orientation