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Journal articles on the topic 'Directivity etc'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

MAILLOU, Balbine, and Joël DUCOURNEAU. "Development of an experimental technique for measuring polar diagrams of adaptive directivity implemented in hearing aids." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 270, no. 8 (2024): 3669–80. http://dx.doi.org/10.3397/in_2024_3357.

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Nowadays, hearing aids have efficient signal processing options to improve speech intelligibility in noise. This work concerns the characterization of the microphone systems directivity available in hearing aids. In recent decades, "adaptive" directivities have been implemented in hearing aids, thus making it possible to focus on useful sound sources in the hearing aid patient environment. These options use the principles of sound environments detection, acoustic beamforming and noise reduction. Performances of these options can be estimated with subjective methods (as speech audiometry in noi

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2

Chen, Nuo, and Yuan Gao. "A port and starboard fuzziness suppressed algorithm based on vector directivity zero." Journal of Physics: Conference Series 2595, no. 1 (2023): 012009. http://dx.doi.org/10.1088/1742-6596/2595/1/012009.

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Abstract Conventional linear array based on acoustic pressure hydrophone can not distinguish the target signal from the port side, so it can not locate the target accurately. The vector hydrophone has natural directivity and can be resolved from starboard to starboard after being formed. However, in practical engineering, it is necessary to further improve the resolution of starboard to starboard because of noise or interference, etc. A new method of port and starboard suppression based on directivity of vector linear array is proposed. The simulation results show that the starboard suppressio

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Ferdous, Md Jannatul, Nayan Sarker, Chinmoy Das, Md Tabil Ahammed, and Zayed Mohammad. "Design and Analysis of A High Frequency Bow-tie Printed Ridge Gap Waveguide Antenna." Journal of Image Processing and Intelligent Remote Sensing, no. 22 (March 11, 2022): 11–23. http://dx.doi.org/10.55529/jipirs.22.11.23.

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Millimeter and microwave wave components are in high demand, which will have a substantial influence on the development of 5G networks. In this work, Ridge Gap Waveguide is used to develop a planar high-gain antenna. The main objective of this study is to develop a wideband, high-gain antenna capable of supporting the expected need for high data transmission in the future. For this reason, a thorough examination of PRGW has been presented, along with a series of high-gain antenna designs that have been extensively tested. In the future, this antenna array might be used for 5G connectivity, and

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Ferdous, Md Jannatul, Nayan Sarker, Chinmoy Das, Md Tabil Ahammed, and Zayed Mohammad. "Design and Analysis of A High Frequency Bow-tie Printed Ridge Gap Waveguide Antenna." Journal of Image Processing and Intelligent Remote Sensing, no. 22 (March 11, 2022): 26–38. http://dx.doi.org/10.55529/jipirs.22.26.38.

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Millimeter and microwave wave components are in high demand, which will have a substantial influence on the development of 5G networks. In this work, Ridge Gap Waveguide is used to develop a planar high-gain antenna. The main objective of this study is to develop a wideband, high-gain antenna capable of supporting the expected need for high data transmission in the future. For this reason, a thorough examination of PRGW has been presented, along with a series of high-gain antenna designs that have been extensively tested. In the future, this antenna array might be used for 5G connectivity, and

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Diksha, Sharma Rupesh Yadav Sanjay Chouhan. "PERFORMANCE COMPARISON OF THE SMART ANTENNA USING PSO AND BB-BC BASED OPTIMIZATION TECHNIQUE." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 6, no. 5 (2017): 730–35. https://doi.org/10.5281/zenodo.801291.

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The electromagnetic power is an important term for wireless communication system. Which tells about the efficiency of the communication and its life in case of battery based communication setup. The reception in the desired direction is important for communication architecture. Hence the directivity and side lobes levels are two important parameters in the antenna system of wireless communication. In this paper the side lobes level reduction with the evolutionary optimization techniques has been given. PSO and BBBC techniques have been used for optimization. The optimization curve and resulted

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Arti, Namdeo* Sanjay Chouhan. "PERFORMANCE ANALYSIS OF THE MFO BASED BEAM STEERING FOR CIRCULAR ANTENNA ARRAY." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 6, no. 6 (2017): 107–12. https://doi.org/10.5281/zenodo.805367.

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The basic property of an antenna is to transmit and receive energy signal in one/all direction. This fundamental property is directivity. While antenna designing an antenna, this is the most important factor that counts for an antenna performance. Hence, its optimization is always given importance. There are so many processes available that are used for optimization of an antenna pattern yet no one out of them provides satisfactorily results by reducing all noise parameters. Depending upon, there are a number of experimentation tools and theories available to optimize the antenna array design

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Lu, Ping, Zhiwei Liu, Enpu Lei, Kama Huang, and Chaoyun Song. "Superdirective Wideband Array of Circular Monopoles with Loaded Patches for Wireless Communications." Sensors 23, no. 18 (2023): 7851. http://dx.doi.org/10.3390/s23187851.

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A wideband superdirective array, composed of a two-element circular monopole configuration, is introduced. The monopoles are placed in close proximity, facing each other on a metal ground. To ensure good matching at high frequencies, two pairs of elliptical patches are added to the sides of the monopoles, enhancing the surface current of the circular patch for wideband performance. To achieve equal amplitude excitation and the desired phase difference, a wideband power divider with a phase shifter is designed to feed the antenna array. Simulation and measurement results demonstrate that the pr

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Ramya, M., V. Parthipan, and M. Yogadeepan. "Certain Investigations on Edge Fed Microstrip Patch Array Antenna for WiMAX Applications." Asian Journal of Electrical Sciences 4, no. 1 (2015): 1–7. http://dx.doi.org/10.51983/ajes-2015.4.1.1937.

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Recently, a new wireless technology, i.e., Worldwide interoperability for Microwave Access (WiMAX), has been demonstrated to have its strong potential to provide a very high speed of broadband services. By simultaneously using multiple antennas at transmitter and receiver sites, these systems exploit the spatial dimension of the propagation channel. The development of such antennas includes the design of array antenna, optimizing the array antenna parameters and thereby increasing its performance. This paper mainly focuses on design of single microstrip patch antennae and linear array configur

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9

Kate, Meenal, and Anjana Goen. "Comparison and Performance Evaluation on Microstrip Patch Antenna for WLAN Application." International Journal of Electrical and Electronics Research 4, no. 3 (2016): 80–84. http://dx.doi.org/10.37391/ijeer.040304.

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This paper present a comparative study between two works proposed for microstrip patch antenna dual band operations. The comparison is made between a dual-band planar antenna with a compact radiator for 2.4/5.2/5.8-GHz Wireless Local Area Network (WLAN) applications and a printed circular microstrip patch antenna with a four rectangular shape strip and co planar rectangular ground plane antenna. The comparative analysis between these two antennas consist of following parameters such as dimensions, bandwidth, gain, return loss, directivity etc.

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10

Saxena, Anurag, Vinod Kumar Singh, Akanksha Lohia, and Mohd Faisal. "A Jawbreaker-Shaped Fragmentary Ground Textile Flexible Antenna." International Journal of Electronics, Communications, and Measurement Engineering 9, no. 2 (2020): 17–29. http://dx.doi.org/10.4018/ijecme.2020070102.

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Under this article, a jawbreaker-shaped textile antenna is designed for assortment applications like satellite communication, security system, medical, etc. For the antenna to be wearable, jeans substrate is used in place of FR-4 material so that it can easily bend. After simulating in CST software, the resonant frequency is 7.5 GHz under which it covers the range of 5.37 GHz to 8.36 GHz frequency. The simulating result of proposed antenna shows high efficiency, better directivity, and radiation pattern. The overall bandwidth of proposed antenna is 27.07%.

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11

Morita, Toshio. "Prospects for Hyper Performance Robots and Mechatronics." Journal of Robotics and Mechatronics 16, no. 6 (2004): 559–62. http://dx.doi.org/10.20965/jrm.2004.p0559.

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Various media have recently reported the contributions of robots, and there is much anticipation for robots that have a larger impact on society to appear. For this purpose, it is necessary to review the technology of robotics or mechatronics in the terms of “performance” that stretches the evaluation in the past of high speed, high precision, high output, small size, safety, etc. and rise above it with flexible ideas. This paper uses the key word hyper performance to describe my opinion of the directivity of future robot development.

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12

Vracar, Miodrag, and Nenad Kovacevic. "Vibration of the vessel and bispectrum of hydroacoustic noise." Facta universitatis - series: Physics, Chemistry and Technology 7, no. 1 (2009): 45–60. http://dx.doi.org/10.2298/fupct0901045v.

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The origin of vessels vibrations is dominantly determined by vessels propulsion system, auxiliary systems, pumps, breaking of the waves at the ship hull, etc. All of these systems contribute to the appearance of the underwater sound in water environment. As a source of underwater sound, vessels has the characteristic of directivity. Vibration of the vessel's structure is analyzed using spectra, but hydroacoustic signals are analyzed using spectra and higher order spectral analysis - bispectra. The measuring of the radiated hydroacoustic noise was done simultaneously with multi channel measurem

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Rehman, Ata ur, Zeeshan Ellahi, Asif Iqbal, Farman Ullah, Ahmed Ali, and Kyung Sup Kwak. "Design and Implementation of Directional Sensors for Privacy-Ensured Device-Free Target Localization in Indoor Environment." Wireless Communications and Mobile Computing 2019 (December 27, 2019): 1–8. http://dx.doi.org/10.1155/2019/8391307.

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This paper presents two radio frequency (RF) sensors with different directivities designed and tested for device-free localization (DFL) in an indoor environment. Mostly, in smart homes and smart offices, peoples may be irritated by wearing the device on them all the time. As compared with device-based localization, the proposed sensors can localize both cooperative and non-cooperative targets (intruders and guests etc.) without privacy leakages. Both sensors are tested to detect the change in received signal strength (ΔRSS) due to the presence of an obstacle. RF sensors, i.e., antennas are de

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14

Singla, Parveen, Shabnam Thakur, Rinkesh Mittal, and Mohit Srivastava. "Millimeter Wave Communication for 5G Networks." CGC International Journal of Contemporary Technology and Research 3, no. 2 (2021): 196–98. http://dx.doi.org/10.46860/cgcijctr.2021.06.31.196.

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The severe increase in the number of consumers in wireless technology has caused traffic processing problems, so the mobile data growth needs a super-productive mobile network. In upcoming 5G technology, that provides faster data rates, low latency; better service quality and greater capacity have emerged. Different frequencies are used to transmit and receive data via radio waves. Between conventional and millimeter wave communications, it is considered that there are essential differences in directivity, sensitivity to blocking and high propagation loss. On some issues, millimeter wave bring

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15

ROUAL, Sarah, Gilles CHARDON, Charles SOUSSEN, and Claude SENSIAU. "A positive semi definite tensor factorization method for separation of non stationary noise sources." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 270, no. 2 (2024): 9427–33. http://dx.doi.org/10.3397/in_2024_4247.

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In the aircraft industry, noise mitigation has emerged as an increasingly pressing issue, underscoring the critical importance of advancing our understanding of noise origins within turbofan engines. This paper presents the application of Positive Semi Definite Tensor Factorization (PSDTF), a potential method for the analysis of engine static tests conducted with far-field microphone arrays. By extending the capabilities of Non-negative Matrix Factorization (NMF), PSDTF offers an effective algorithm for source separation. Leveraging on cross spectral matrices to harness phase information acros

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16

Borel, Touko Tcheutou Stephane, and Rashmi Priyadarshini. "A Compact Microstrip Patch Antenna for X-Band Applications." Transactions on Electromagnetic Spectrum 1, no. 2 (2022): 24–30. https://doi.org/10.5281/zenodo.6912708.

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<strong>Abstract:</strong> Nowadays, microstrip antennas are widely used in wireless applications. There are so many bands of frequency and they can be listed out L, S, X, Ka etc. For this work, it is only focused on X bands only. The range of frequency of X band is from 8 to 12 GHz. In this paper, the design and simulation of the compact microstrip patch antenna for X band applications are proposed and the main goal of this paper is to get good results from the designed antenna. The software used in this paper is HFSS 15 (High Frequency Structure Simulator 15). The proposed antenna is a recta

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17

Singhal, P. K., and Arun Kant Kadam. "Potential Parameters Enhancement of Compact Microstrip Antenna by Using “SLOTTED SRR” Shaped Metamaterial Structure." International Journal of Electrical and Electronics Research 3, no. 2 (2015): 23–26. http://dx.doi.org/10.37391/ijeer.030204.

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This work demonstrates integration of an artificial material onto a Rectangular Microstrip Patch Antenna to improve its performance. Such antennas are gaining a high interest as system designer require more complex function to be implemented in reduced area. The artificial material used is commonly called “Metamaterial” or “Left-Handed-Metamaterial (LHM)” and it exhibit some peculiar electromagnetic properties that don’t exist in nature. So, when a microstrip patch antenna is integrated using Left-Handed-Metamaterial, potential parameters like return loss, bandwidth, directivity, gain & ef

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18

Baibikov, Elena. "FAIRYLESS TALES AT THE SOURCE OF JAPANESE KIDLIT: SOME THOUGHTS ON INSTRUCTIONAL GENRE AS A PART OF EMERGENT NATIONAL CHILDREN’S LITERATURE." Children's Readings: Studies in Children's Literature 25, no. 1 (2024): 100–128. http://dx.doi.org/10.31860/2304-5817-2024-1-25-100-128.

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Focusing on the dynamics of cultural transfer, this essay examines the shifting landscape of Japanese children’s literature, tracing its formation from the 17th century to the present through the lens of educational literature. It presents specific examples of instructional materials — encyclopedias, textbooks etc. — to illustrate the diversity of genres within educational literature and their impact on the emerging identity of Japanese children’s literature, particularly in comparison with other genres such as folklore and fairy tales. The essay proposes three interpretations of the concept o

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19

Panda, Ribhu Abhusan, Mihir Panda, Pawan Kumar Nayak, and Debasish Mishra. "Butterfly Shaped Patch Antenna for 5G Application." International Journal of Electrical and Electronics Research 8, no. 3 (2020): 32–35. http://dx.doi.org/10.37391/ijeer.080301.

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Widely used patch in circular shape has been cut in two semicircular shapes and joined together, arc to arc to same feed in dipolar form, produces a butterfly shape. In this paper each semicircular shapes are remodeled as bi-circular shapes for enhancement of gain so that it can be operated at a frequency of 15GHz which is applicable for 5G communication. This antenna is placed on a substrate of FR4-epoxy material. The design of the shape is based on the minimum distance of the two extreme arcs of the two parts which becomes the wavelength of the required resonant frequency. This design is com

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20

Öziş, E., A. V. Osipov, and T. F. Eibert. "Metamaterials for Microwave Radomes and the Concept of a Metaradome: Review of the Literature." International Journal of Antennas and Propagation 2017 (2017): 1–13. http://dx.doi.org/10.1155/2017/1356108.

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A radome is an integral part of almost every antenna system, protecting antennas and antenna electronics from hostile exterior conditions (humidity, heat, cold, etc.) and nearby personnel from rotating mechanical parts of antennas and streamlining antennas to reduce aerodynamic drag and to conceal antennas from public view. Metamaterials are artificial materials with a great potential for antenna design, and many studies explore applications of metamaterials to antennas but just a few to the design of radomes. This paper discusses the possibilities that metamaterials open up in the design of m

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Mr.P.Sivakumar, Ms.P.Arunadevi, Ms.T.Revathi, Vignesh Mr.L.K.Balaji, and Mr.C.Shanmugaraja. "Design of E-shaped Microstrip Patch antenna for S band Applications." Journal of Electronic Design Engineering 5, no. 2 (2019): 11–14. https://doi.org/10.5281/zenodo.3333579.

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Micro strip antennas are widely used in many applications due to their low profile, low cost and ease of fabrication which is required in various applications like mobile & satellite communication, Global positioning system and wireless application etc. In this paper, different E-shaped micro strip patch antennas are designed and the results are compared. The antenna design is an improvement from previous research and it is simulated using ADS (Advanced Design System) software. The design has been made on low cost material of FR4 substrate having dielectric constant of 4.2 with thickness o

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Muhammad, Imran, Anne Heimes, and Michael Vorländer. "Interactive real-time auralization of airborne sound insulation in buildings." Acta Acustica 5 (2021): 19. http://dx.doi.org/10.1051/aacus/2021013.

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Sound insulation auralization can be used as valuable tool to study the perceptual aspects of sound transmission in built environments for assessment of noise effects on people. It may help to further develop guidelines for building constructions. One advanced goal of real-time sound insulation auralization is to appropriately reproduce the condition of noise effects on the human perception and cognitive performance in dynamic and interactive situations. These effects depend on the kind of noise signal (i.e. speech, music, traffic noise, etc.) and on the context. This paper introduces a sound

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Abhishek, Banoth, Popuri Pavaneswar, Cheruvu Bharath Kumar, and Manoj Sindhwani. "Dual Axis Solar Tracking System." International Journal for Research in Applied Science and Engineering Technology 10, no. 7 (2022): 1367–73. http://dx.doi.org/10.22214/ijraset.2022.45463.

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Abstract: The extending interest in energy the, ceaseless decline in existing wellsprings of non-renewable energy source, also, the creating concern in regards to ecologicaldefilement has pushed humanity to examine new advancement for the making of electrical energy using unblemished, economical sources, similar to daylight-based energy, wind energy, etc. Among the forward-thinking manageable power sources, sun oriented based energy has inconceivable Changes to electric power have the possibility to be made, preparing it to guarantee critical piece of the planet's electrical energy requirement

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Hoque, Ahasanul, Mohammad Tariqul Islam, and Ali F. Almutairi. "Low-Profile Slotted Metamaterial Antenna Based on Bi Slot Microstrip Patch for 5G Application." Sensors 20, no. 11 (2020): 3323. http://dx.doi.org/10.3390/s20113323.

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A low-profile high-directivity, and double-negative (DNG) metamaterial-loaded antenna with a slotted patch is proposed for the 5G application. The radiated slotted arm as a V shape has been extended to provide a low-profile feature with a two-isometric view square patch structure, which accelerates the electromagnetic (EM) resonance. Besides, the tapered patch with two vertically split parabolic horns and the unit cell metamaterial expedite achieve more directive radiation. Two adjacent splits with meta units enhance the surface current to modify the actual electric current, which is induced b

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Husain, Bhaldar, Gowre SanjayKumar, S. Mathpati Mahesh, A. Jadhav Ashish, and Ustad MainazS. "DESIGN OF WEARABLE MULTIBAND CIRCULAR MICROSTRIP TEXTILE ANTENNA FOR WIFI/WIMAX COMMUNICATION." Engineering and Technology Journal 06, no. 03 (2021): 798–806. https://doi.org/10.47191/etj/v6i3.01.

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In proposed design the wearable circular microstrip antenna of radius of patch is 14 mm and the top of patch consist of two square slits of dimensions 5x5 mm<sup>2</sup> and 10x10mm<sup>2</sup> and the ground structure is made partial of 28mm x 86mm. Due to the properties of jeans fabric as low cost, flexible the antenna is made wearable. In the proposed study, circular microstrip textile based antenna has been designed for the ISM band of resonating frequency of 2.4GHz.  The proposed structure provided the triple band as the radiating frequencies of 2.4GHz for WiFi, 6.4GHz for

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Zeyde, K. M., M. V. Ronkin, and A. A. Kalmykov. "Electrodynamic Computer Model of a Metal Rod in a Concrete Medium Detection." Ural Radio Engineering Journal 5, no. 2 (2021): 104–18. http://dx.doi.org/10.15826/urej.2021.5.2.002.

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The main aim of the present work is to describe a generalized electrodynamic model of the specific device operation, which provides detection and measurement of the geometric characteristics of the reinforcement cage in a concrete structure. The result of this study is the design of the device’s receiving-transmitting path that is optimal in a number of parameters, as well as a signal processing algorithm based on the operation of an artificial neural network trained on the generalized computer model output data. In addition to the main functionality of the device being developed, which consis

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Murakami, Hironaru, Taiga Fukuda, Hiroshi Otera, Hiroyuki Kamo, and Akito Miyoshi. "Development of a High-Sensitivity Millimeter-Wave Radar Imaging System for Non-Destructive Testing." Sensors 24, no. 15 (2024): 4781. http://dx.doi.org/10.3390/s24154781.

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There is an urgent need to develop non-destructive testing (NDT) methods for infrastructure facilities and residences, etc., where human lives are at stake, to prevent collapse due to aging or natural disasters such as earthquakes before they occur. In such inspections, it is desirable to develop a remote, non-contact, non-destructive inspection method that can inspect cracks as small as 0.1 mm on the surface of a structure and damage inside and on the surface of the structure that cannot be seen by the human eye with high sensitivity, while ensuring the safety of the engineers inspecting the

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Zaporozhets, Oleksandr, and Alexandras Jagniatinskis. "Improving single flyover noise prediction for subsonic aircraft." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 3 (2021): 3259–70. http://dx.doi.org/10.3397/in-2021-2352.

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Current ICAO Doc 9911 provides the algorithm to calculate aircraft noise levels for any kind of airport flight scenario. The essential difference exists between the measured and calculated sound levels, especially for single flight noise events. Doc 9911 recommends using this method for equivalent sound levels L and noise indices L first of all. A number of national noise regulations still require for single noise event assessment. An article analyzes a number of reasons to explain the inaccuracy of noise event calculations. For example, the differences between calculated balanced flight param

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Archibong, E. A., and A. O. Njok. "Design of a Broadband Microstrip Patch Antenna Operating between 1.5 Ghz - 4.5 Ghz." Physical Science International Journal 29, no. 1 (2025): 1–11. https://doi.org/10.9734/psij/2025/v29i1868.

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A printed circuit board-fabricated antenna is known as a microstrip patch antenna (MSA). It consists of a dielectric substrate that is encased in a ground plane on one side and a radiating patch on the other. A MSA's adaptability is enhanced by its small size, light weight, affordable production costs, simplicity of installation, etc. It can be examined using many antenna parameters, including the voltage standing wave ratio (VSWR), reciprocity, field areas, and S parameter. The Roger 3003 material (lossy) was used as the substrate in this work to create a rectangular broadband MSA with a band

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Marapulets, Yuri, Alexandra Solodchuk, Olga Lukovenkova, Mikhail Mishchenko, and Albert Shcherbina. "Sound Range AE as a Tool for Diagnostics of Large Technical and Natural Objects." Sensors 23, no. 3 (2023): 1269. http://dx.doi.org/10.3390/s23031269.

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Application of acoustic emission of the sound frequency range is under consideration. This range is of current interest for the diagnostics of the stability of mountain slopes, glaciers, ice covers, large technical constructions (bridges, dams, etc.) as well as for the detection of rock deformation anomalies preceding earthquakes. Acoustic sensors, which can be used to record and to determine the directivity of acoustic emission of the sound frequency range, are under consideration. The structure of the system for acoustic emission recording, processing and analysis is described. This system m

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Safitri, Nurlaila, Rina Pudji Astuti, and Bambang Setia Nugroho. "Switch-Beam Vivaldi Array Antenna Based On 4x4 Butler Matrix for mmWave." MATEC Web of Conferences 218 (2018): 03011. http://dx.doi.org/10.1051/matecconf/201821803011.

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It will be diffcult to use either omnidirectional or fixed beam antenna due to the high propagation losses caused by atmospheric absorption at mmWave for 5G mobile communication. Several studies have been conducted recently using butler matrix which is part of switchable antenna with some advantages such as simple, minimal cost, low loss, etc. Previous studies also have designed vivaldi array antenna at 28 GHz which provides a fix beam directional radiation pattern with narrow beam that requires real phase setting. However, there has been no research using vivaldi antenna with butler matrix, w

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Peng, Xiuyuan, Junfei Li, and Steven Cummer. "Enhancing low frequency sound radiation of electrodynamic loudspeakers with acoustic metamaterials." Journal of the Acoustical Society of America 151, no. 4 (2022): A179. http://dx.doi.org/10.1121/10.0011024.

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Since the radiation resistance of a vibrating membrane in the air is proportional to frequency in the subwavelength range, low frequency (<100Hz) sound radiating devices generally require a large vibrating diaphragm and a bulky enclosure to be efficient and loud enough for practical use. The tapped horn topology, where the front radiation of an electrodynamic driver adds up with the back radiation after propagating through the internal volume of a speaker box, has been widely used in custom audio to provide low-frequency enhancement to the bass unit. Recently, people have demonstrated the a

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Wang, Hongjian, Junyuan Tian, and Wang Luo. "Three-Dimensional Simulation Analysis of the Influence of Slat Structural Parameters on Slat Aerodynamic Noise." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 37, no. 6 (2019): 1129–37. http://dx.doi.org/10.1051/jnwpu/20193761129.

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Slat aerodynamic noise is one of important components of the frame noise. Adjusting the parameters of the slat structure can suppress the slat noise radiation effectively. Based on the typical multi-element airfoil 30P30N, firstly, by means of adjusting the parameters of slat structure, such as changing relative positions between slat and main airfoil and closing slat gap etc., a new slat profile is obtained; Then, based on the DDES simulation method, the characteristics of vortex distribution is analyzed for the new airfoil structure model, and the directivity and SPL of the far field noise a

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Zhou, Jianbo, Shengchun Piao, Yiwang Huang, Shizhao Zhang, and Ke Qu. "A spatial correlation model for the horizontal non-isotropic ocean ambient noise vector field." Journal of Low Frequency Noise, Vibration and Active Control 36, no. 2 (2017): 124–37. http://dx.doi.org/10.1177/0263092317711984.

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The ocean ambient noise is one of interference fields of underwater acoustic channel. The design and use of any sonar system are bound to be affected by ocean ambient noise, so to research the spatial correlation characteristics of noise field is of positive significance to improving the performance of sonar system. Only wind-generated noise is considered in most existing ambient noise models. In this case, the noise field is isotropic in horizontal direction. However, due to those influencing factors, like rainfall, ships and windstorm, etc. for a real ocean environment, noise field becomes a

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Bayev, A. R., A. L. Mayorov, N. V. Levkovich, D. V. Shavlovskiy, and M. V. Asadchaya. "Influence of Geometry and Boundary Conditions in Area of Cohesion between Materials on the Reflection of an Ultrasonic Beam. Part 1. Theoretical research." Devices and Methods of Measurements 12, no. 2 (2021): 124–32. http://dx.doi.org/10.21122/2220-9506-2021-12-2-124-132.

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The improvement of efficiency, reliability and productivity of ultrasonic testing of objects with cohesion between materials connected by welding, soldering, gluing, etc. is 'an important problem of the modern production technologies. The purpose of the paper is to determine in 3D space the conditions for increasing the sensitivity and reliability of the flaw detection in the cohesion zone between materials when the form of defect interface can be different.In the first part of the theoretical study the features of the formation of the acoustic fields of ultrasonic waves scattered from solid's

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Решетілов Б. Ю. "КОМПОЗИЦІЙНИЙ ВПЛИВ КАМЕРНІЗАЦІЇ ЯК ОДИН З ФАКТОРІВ СТАНОВЛЕННЯ ДРАМАТУРГІЧНОГО ПРОЦЕСУ У КОНЦЕРТНИХ ТВОРАХ ДЛЯ ФОРТЕПІАНО З ОРКЕСТРОМ ХХ СТОРІЧЧЯ". World Science 2, № 12(40) (2018): 56–59. http://dx.doi.org/10.31435/rsglobal_ws/30122018/6277.

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   The subject of this research is to consider the compositional properties of the chamber tendency in relation to drama in compositions for solo instruments within a chamber orchestra. As twentieth century composers' raised interest in chamber-orchestral concert genres, this caused a number of consequences affecting the formation of dramatic specifics. Some of these include those trends of chamber tendency, which relate to timbre, form, genre, neoclassical manifestations, aesthetics, character directivity, etc. Revision of the semantic component of the chamber orchestra tool

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Cheng, Dandan, Zhaofa Zeng, Wei Ge, Yuemeng Yin, Chenghao Wang, and Shaolong Li. "A Novel High-Precision Imaging Radar for Quality Inspection of Building Insulation Layers." Applied Sciences 15, no. 11 (2025): 5991. https://doi.org/10.3390/app15115991.

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In recent years, the building insulation layer peeling caused by quality problems has brought about safety hazards to human life. Existing means of non-destructive testing of building insulation layers, including laser scanning, infrared thermal imaging, ultrasonic testing, acoustic emission, ground-penetrating radar, etc., are unable to simultaneously guarantee the detection depth and resolution of the insulation layer defects, not to mention high-precision imaging of the insulation layer structure. A new type of high-precision imaging radar is specifically designed for the quantitative quali

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Avdeyenko, Gleb, Teodor Narytnyk, and Inna Butko. "Impulse ultrawideband wireless communication system of the terahertz frequency band." Problemi telekomunìkacìj, no. 1(32) (November 24, 2023): 3–19. http://dx.doi.org/10.30837/pt.2023.1.01.

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The article considers the possibility of developing a wireless telecommunication system of the terahertz band (THz), in which an impulse radio ultrawideband signal (IR-UWB) is used as an information carrier. Variants of the transmission and reception path constructions of the THz IR-UWB wireless communication system (WCS) are considered, taking into account the technical characteristics of the THz devices available on the telecommunication market. One of the main results is the block diagram of the IR-UWB WCS of the terahertz range development of the point–to–point type based on the heterodyni

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Darvasi, Yaniv, and Amotz Agnon. "Calibrating a new attenuation curve for the Dead Sea region using surface wave dispersion surveys in sites damaged by the 1927 Jericho earthquake." Solid Earth 10, no. 2 (2019): 379–90. http://dx.doi.org/10.5194/se-10-379-2019.

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Abstract. Instrumental strong motion data are not common around the Dead Sea region. Therefore, calibrating a new attenuation equation is a considerable challenge. However, the Holy Land has a remarkable historical archive, attesting to numerous regional and local earthquakes. Combining the historical record with new seismic measurements will improve the regional equation. On 11 July 1927, a rupture, in the crust in proximity to the northern Dead Sea, generated a moderate 6.2 ML earthquake. Up to 500 people were killed, and extensive destruction was recorded, even as far as 150 km from the foc

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Schrank, H., and K. Praba. "Optimal aperture for maximum edge-of-coverage (EOC) directivity." IEEE Antennas and Propagation Magazine 36, no. 3 (1994): 72–74. http://dx.doi.org/10.1109/74.294251.

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Premathilake, Tharanga, Jeevani Jayasinghe, Omar Saraereh, Karu Esselle, and Rajas Khokle. "High Directivity Broadband Hexagonal Fractal Ring Antenna with Modified Ground." ECTI Transactions on Electrical Engineering, Electronics, and Communications 18, no. 1 (2020): 1–8. http://dx.doi.org/10.37936/ecti-eec.2020181.239914.

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A highly directive fractal antenna with a novel shape is proposed in this paper. Finite Element Method based simulations were carried out on the first three iterations of a hexagonal fractal ring and the performance was measured in terms of the resonant behavior, directivity, radiation efficiency, current distribution, and radiation pattern. The second iteration fractal antenna radiates well along the broadside direction at the fundamental mode of operation. The ground plane was modified to improve the performance further. The antenna, etched on an FR4 substrate, has a directivity of 11.8 dB a

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Tsaliev, T. A., and A. O. Vakarchuk. "CHARACTERISTICS OF VIBRATOR ARRAYS DIRECTIVITY ON HARMONICS OF MAIN FREQUENCY." Proceedings of the O.S. Popov ОNAT 1, no. 2 (2020): 40–49. http://dx.doi.org/10.33243/2518-7139-2020-1-2-40-49.

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Antenna patterns representing dependences of the directivity factor (DF) on angular coordinates for arrays formed from Yagi-Uda aerials are considered and discussed. The results of computer modelling are based on the decision of integral equations by the method of moments. Patterns that represent dependences of the coefficient of the directivity factor (DF) for an array and her elements from angular coordinates are counted on fundamental frequency and four harmonics. The data obtained confirmed the validity of the assumptions that the directivity properties of vibrator antenna arrays can signi

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Mohini, Narendra Naik, and Gulamali Virani Hasanali. "A compact four port MIMO antenna for millimeterwave applications." Bulletin of Electrical Engineering and Informatics 11, no. 2 (2022): 878~885. https://doi.org/10.11591/eei.v11i2.3689.

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A novel compact microstrip MIMO antenna with high isolation and low envelope correction coefficient has been proposed and presented in this paper. The proposed antenna is compact in size with 3.22x4.86 mm2 , operating over the frequency band of 60GHz. The MIMO antennas have been designed andsimulated using electromagnetic design and verification platformIE3DTM. Two ports MIMO antenna with the size of 3.22x1.93 mm2 resonates at 58.1 GHz covering a band of 57-59.3 GHz, with the bandwidth of 2.3 GHz, gain of 5.2 dBi, and directivity of 8.67 dBi. It also provides aninput reflection coefficient of

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Yadav, Vandna, and (Dr.) Gupta Sumit Kumar Prof. "Antenna design Design and Performance Analysis of a Graphene-Based Two-Port MIMO Yagi-Uda Antenna for THz Applications." International Researchers Journal Volume XII, Issue-4 (2025): 13–22. https://doi.org/10.5281/zenodo.15123517.

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<strong>Abstract </strong>The rapid advancements in terahertz (THz) communication demand high-performance antenna solutions with enhanced gain, directivity, and miniaturization. This study presents the design and performance analysis of a graphene-based two-port multiple-input multiple-output (MIMO) Yagi-Uda antenna optimized for THz applications. Graphene, known for its tunable conductivity and superior electronic properties, is employed as the primary radiating material to achieve reconfigurability and high efficiency at THz frequencies. The proposed MIMO Yagi-Uda structure features a c

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Naik, Mohini Narendra, and Hasanali Gulamali Virani. "A compact four port MIMO antenna for millimeterwave applications." Bulletin of Electrical Engineering and Informatics 11, no. 2 (2022): 878–85. http://dx.doi.org/10.11591/eei.v11i2.3689.

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A novel compact microstrip MIMO antenna with high isolation and low envelope correction coefficient has been proposed and presented in this paper. The proposed antenna is compact in size with 3.22x4.86 mm2, operating over the frequency band of 60GHz. The MIMO antennas have been designed andsimulated using electromagnetic design and verification platformIE3DTM. Two ports MIMO antenna with the size of 3.22x1.93 mm2 resonates at 58.1 GHz covering a band of 57-59.3 GHz, with the bandwidth of 2.3 GHz, gain of 5.2 dBi, and directivity of 8.67 dBi. It also provides aninput reflection coefficient of -

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Alsharari, Meshari, Vishal Sorathiya, Ammar Armghan, Kavan Dave, and Khaled Aliqab. "Development of Split Ring Resonator Shaped Six Element 2 × 3 Multiple Input Multiple Output Antenna for the C/X/Ku/K Band Applications." Micromachines 14, no. 4 (2023): 874. http://dx.doi.org/10.3390/mi14040874.

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In this manuscript, we have numerically investigated and experimentally verified the six-element split ring resonator and circular patch-shaped multiple input, multiple output antenna operating in the 1–25 GHz band. MIMO antennas are analyzed in terms of several physical parameters, such as reflectance, gain, directivity, VSWR, and electric field distribution. The parameters of the MIMO antenna, for instance, the envelope correlation coefficient (ECC), channel capacity loss (CCL), the total active reflection coefficient (TARC), directivity gain (DG), and mean effective gain (MEG), are also inv

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Antić, Aleksandra M. "NOTES ON THE SYNTAX OF THE BARANJA TRANSCRIPTION OF DUŠAN’S CODE." Serbian Studies Research XIV, no. 1 (2023): 11–51. http://dx.doi.org/10.46793/ssrxiv1.011a.

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After analyzing the syntactic language in the Baranja transcription, it was discovered that adjectives and verbs generally matched the gender of the noun they were describing, even if the natural and grammatical genders differed. Plural nouns were usually matched with plural verbs, and singular verbs were used with multi-mem- ber subject expressions. The expected form of nouns was typically used with the basic numbers two, three, and four, while the genitive plural form was used with numbers greater than five and with the noun thousand. However, the construction of the base number twelve devia

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Alharbi, Abdullah G., and Vishal Sorathiya. "Ultra-Wideband Graphene-Based Micro-Sized Circular Patch-Shaped Yagi-like MIMO Antenna for Terahertz Wireless Communication." Electronics 11, no. 9 (2022): 1305. http://dx.doi.org/10.3390/electronics11091305.

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In this work, an ultra-wideband graphene-based micro-sized circular patch-shaped Yagi-like MIMO antenna was investigated over 1–30 THz of the frequency spectrum. The proposed antenna structure was designed over a polyimide substrate with 620 × 800 µm2. This antenna was radiated over three bands over 1–30 THz. The maximum bandwidth achieved 10.96 THz, with −26 dB of the return loss isolation. These three bands were also mathematically analyzed using various MIMO antenna parameters to match the MIMO antenna criteria. This antenna provided all the accepted results as per the limits set by these a

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Ludwigsen, Daniel, and Ronald E. Kumon. "Program assessment in undergraduate acoustics at Kettering University." Journal of the Acoustical Society of America 153, no. 3_supplement (2023): A146. http://dx.doi.org/10.1121/10.0018453.

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Kettering University has been teaching acoustics as part of undergraduate engineering for decades, and the senior-level acoustics laboratory course has assumed a critical role in the continuous improvement process for our ABET-accredited programs in Applied Physics and Engineering Physics. This project-based course addresses learning objectives focused on transferable skills in test and measurement, literature and theoretical foundations, and computational modeling. These are set in the context of two modules, on sound source directivity and modal testing. The assessment structure is built aro

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Li, Hong Jing, and Li An Chen. "Design and Analysis of Self-Collimation-Based Photonic Crystal Beam Splitter." Advanced Materials Research 887-888 (February 2014): 417–21. http://dx.doi.org/10.4028/www.scientific.net/amr.887-888.417.

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We present a self-collimation-based beam splitter in a two-dimensional photonic crystal (2D-PC) by introducing defects near the termination. From the equi-frequency contour (EFC) calculations and the finite-difference time-domain (FDTD) simulations, we show that the defects can give rise to the splitting of self-collimated beams in 2D-PCs and the directivity of the deflected beam can be improved by the defect along the PC surface. In order to get different kinds of beam splitters, including the Y-shaped, one-to-three, one-to-four structures, and so on, we only need to modify the structure of t

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