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Journal articles on the topic 'Spiral array'

Author: Grafiati

Published: 10 March 2023

Last updated: 19 July 2025

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1

Liu, Siqi, Liyang Chen, and Yanhui Liu. "Design of Parameter-Optimized Spiral Arrays with Ultra-Wideband Grating Lobe Suppression." Electronics 12, no. 7 (2023): 1664. http://dx.doi.org/10.3390/electronics12071664.

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An effective method is presented to design the layout of spiral array with ultra-wideband (UWB) grating lobe suppression. In this method, the general array factor expression of spiral array is formulated. Then, the synthesis problem of spiral array layout is converted to an optimization problem of three geometric parameters: s, r and Δϕ. These parameters can determine the exact position of each element. The optimization problem is solved by particle swarm optimization (PSO) algorithm where the constraints of element spacing and array aperture are introduced. For different-sized spiral arrays,

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de Souza, Júlio Cesar Eduardo, Montserrat Parrilla Romero, Ricardo Tokio Higuti, and Óscar Martínez-Graullera. "Design of Ultrasonic Synthetic Aperture Imaging Systems Based on a Non-Grid 2D Sparse Array." Sensors 21, no. 23 (2021): 8001. http://dx.doi.org/10.3390/s21238001.

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This work provides a guide to design ultrasonic synthetic aperture systems for non-grid two-dimensional sparse arrays such as spirals or annular segmented arrays. It presents an algorithm that identifies which elements have a more significant impact on the beampattern characteristics and uses this information to reduce the number of signals, the number of emitters and the number of parallel receiver channels involved in the beamforming process. Consequently, we can optimise the 3D synthetic aperture ultrasonic imaging system for a specific sparse array, reducing the computational cost, the har

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3

Wang, Ningning, Yonghe Wei, and Zonglin Li. "Research on multi-sound source localization performance based on leaf-shaped microphone array." Journal of Physics: Conference Series 2479, no. 1 (2023): 012026. http://dx.doi.org/10.1088/1742-6596/2479/1/012026.

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Abstract In the research of multi-sound source localization, the geometric rules for the spatial arrangement of microphone arrays play a decisive role. When faced with multiple sound sources with close positions, traditional typical arrays are difficult to accurately locate the desired signals. Therefore, this paper proposes a leaf-shaped microphone array based on the theory of bionic sunflower spiral arrangement. When the incident signals are multiple sound sources with close positions, combined with the delay-sum beamforming algorithm, the performance of the leaf-shaped array is analyzed fro

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Yoon, Hansol, and Tai-Kyong Song. "Sparse Rectangular and Spiral Array Designs for 3D Medical Ultrasound Imaging." Sensors 20, no. 1 (2019): 173. http://dx.doi.org/10.3390/s20010173.

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In three-dimensional (3D) medical ultrasound imaging with two-dimensional (2D) arrays, sparse 2D arrays have been studied to reduce the number of active channels. Among them, sparse 2D arrays with regular or uniform arrangements of elements have advantages of low side lobe energy and uniform field responses over the entire field of view. This paper presents two uniform sparse array models: sparse rectangular arrays (SRAs) on a rectangular grid and sparse spiral arrays (SSAs) on a sunflower grid. Both arrays can be easily implemented on the commercially available or the custom-made arrays. To s

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Yastrebtsova, Olga I., and Vadim V. Chebyshev. "USE OF MULTILAYER DIELECTRIC FOR SLOT PHASED ARRAY ANTENNAS." SYNCHROINFO JOURNAL 9, no. 6 (2023): 2–11. http://dx.doi.org/10.36724/2664-066x-2023-9-6-2-11.

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It is of interest to study slot spiral radiators as part of a phased array with structural elements in the form of multi-layer dielectrics that make up a multilayer substrate and a spiral cover, which, by changing the parameters of a multilayer dielectric, can significantly change the frequency properties of the radiator and its overall dimensions. The purpose of the work is to develop a mathematical model for a phased array in the form of a periodic structure with slotted spiral radiators using multilayer dielectrics in the design, and its numerical analysis with the study of its frequency pr

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6

Li, Tianlong, Zhijun Liu, Chen Zhang, et al. "Synthesis of Non-Uniform Spiral Antenna with Low Peak Sidelobe Level Using Enhanced Harris Hawks Optimization Algorithm." Electronics 13, no. 15 (2024): 2959. http://dx.doi.org/10.3390/electronics13152959.

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In this paper, to obtain antenna arrays with grating lobes suppression capability in wideband and achieve a low peak sidelobe level (PSLL), two non-uniform spiral antenna arrays and an enhanced Harris Hawks optimization (EHHO) algorithm are proposed. By controlling the parameters of the spiral line and sampling equidistant on the spiral line, the sampling points that make up the non-uniform array can be arranged in the plane uniformly and non-uniformly. The simulation results indicate that, because of this special arrangement, the non-uniform arrays obtain the capability of grating lobe suppre

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7

Engebretson, Mark E., and Luis F. Esparza. "Spiral line array loudspeaker." Journal of the Acoustical Society of America 127, no. 5 (2010): 3286. http://dx.doi.org/10.1121/1.3432269.

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8

Hebib, S., N. Raveu, and H. Aubert. "Cantor Spiral Array for the Design of Thinned Arrays." IEEE Antennas and Wireless Propagation Letters 5 (2006): 104–6. http://dx.doi.org/10.1109/lawp.2006.872415.

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9

Yunlin Liu, Yong Wang, and Rugui Yang. "A cylindrical spiral patch array." IEEE Transactions on Antennas and Propagation 49, no. 2 (2001): 196–99. http://dx.doi.org/10.1109/8.914275.

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10

RECIOUI, Abdelmadjid. "Concentric Ring Arrays Optimization Using the Spiral Inspired Technique." Algerian Journal of Signals and Systems 3, no. 1 (2018): 10–21. http://dx.doi.org/10.51485/ajss.v3i1.55.

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In this work, concentric ring Arrays (CRA) with non-uniform excitation are investigated, with the objective being to minimize the Sidelobe Level (SLL) for the array and keep the Directivity within an acceptable value. The optimization technique to be used to reach this objective is the spiral inspired optimization technique.. First, the technique is used to minimize the SLL only. Next the array factor is optimized for Directivity only. Then, the excitation is varied for both SLL and Directivity to be optimized. The results show significant improvements with respect to the uniform case, especia

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11

Fukuoka, Junya, Matthias D. Hofer, Takashi Hori, et al. "Spiral Array: A New High-Throughput Technology Covers Tissue Heterogeneity." Archives of Pathology & Laboratory Medicine 136, no. 11 (2012): 1377–84. http://dx.doi.org/10.5858/arpa.2011-0393-oa.

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Context.—Tissue array is a well-established technique that connects basic research with clinical applications and allows for the validation of many pathobiologic events from gene expression dysregulation to genomic aberrations. However, conventional tissue array has several limitations such as poor representation of tissue heterogeneity, destruction of donor tissue blocks due to coring, and usage of particular specimens that have limited evaluable material (tissue from thin specimens or needle biopsies). Objective.—To show the noninferiority and superiority of the new technique named Spiral Ar

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12

Liu, Z. Q., and Mian Hao Zhang. "Based on Pro/E Construction Method of Spiral Bevel Gear Logarithm." Advanced Materials Research 215 (March 2011): 167–71. http://dx.doi.org/10.4028/www.scientific.net/amr.215.167.

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For a new type of bevel gear named as logarithmic spiral bevel gear, establish its tooth direction curves and the mathematical model of tooth surface equation. With CAD software platform which can intuitive understanding of complex curves and combined with conical logarithmic spiral parameter equation build the logarithmic spiral on cone surface. Then array logarithmic spiral to make them evenly distributed in the cone surface, without any interference and to meet the strength distribution on both ends of circular truncated cone equally. Use two logarithmic spirals from different starpoint as

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13

Li, Qiang, Zi Liang Wei, Hong Bo Yan, and Hai Yan Hu. "A New Method of Constructing Tooth Surface for Logarithmic Spiral Bevel Gear." Advanced Materials Research 129-131 (August 2010): 235–40. http://dx.doi.org/10.4028/www.scientific.net/amr.129-131.235.

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For a new type of bevel gear—logarithmic spiral bevel gear, establish its tooth direction curves and the mathematical model of tooth surface equation. With CAD software platform which can intuitive understanding of complex curves and combined with conical logarithmic spiral parameter equation build the logarithmic spiral on cone surface. Then array logarithmic spiral to make them evenly distributed in the cone surface, without any interference and to meet the strength distribution on both ends of circular truncated cone equally. Use two logarithmic spirals from different starpoint as tooth dir

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14

Radó, János, Péter Udvardi, Saeedeh Soleimani, et al. "Low-Frequency Piezoelectric Accelerometer Array for Fully Implantable Cochlear Implants." Proceedings 2, no. 13 (2018): 1059. http://dx.doi.org/10.3390/proceedings2131059.

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We demonstrate a low-volume, stress-free, piezoelectric micro-electromechanical system (MEMS) cantilever array for fully implantable hearing aids. The 12-element spiral-matrix is sensitive to the lower part of audible frequency range (300–700 Hz) through the proper resonant frequency of the individual spirals tuned by dimensions of the cantilevers. The obtained high Q-factors (117–254) provide high frequency selectivity. The generated open circuit voltage signals could be sufficient for the direct analog conversion of the signals for cochlear multielectrode implants. By comparing different geo

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15

Lu, Guo, Lan, Sun, Li, and Zhou. "Underwater Spiral Wave Sound Source Based on Phased Array with Three Transducers." Sensors 19, no. 14 (2019): 3192. http://dx.doi.org/10.3390/s19143192.

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This paper realizes an underwater spiral wave sound source by using three omni-directional spherical transducers with three different phases. The pressure distribution of the sound field for a phased array is derived using the superposition theory of sound field. The generation of spiral wave field is presented, the relationship between the performance of phased array sound field and the array parameters is analyzed, and also verified by the finite element method (FEM). A spiral wave sound source with three spherical piezoelectric ceramic transducers is then designed and fabricated based on FE

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16

Wang, Hairui, Yao Zhang, Siyu Chen, et al. "Mechanics Design of Conical Spiral Structure for Flexible Coilable Antenna Array." International Journal of Aerospace Engineering 2022 (May 24, 2022): 1–8. http://dx.doi.org/10.1155/2022/4265384.

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Limited by the effective launch capacity of a rocket, the deployable antenna is very important in the design of spaceborne antenna array. Compared to traditional deployable antenna, flexible coilable antenna array has higher surface precision and better vibration control and therefore is more suitable for high frequency communication. In order to minimize the weight of satellite and reduce cost of its launch, a design guideline to the geometry parameters of flexible coilable antenna array is crucial. Existing models cannot be directly applied to interaction and large deformation between coilab

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17

Chen, Lin Song, Yue Yun Cao, and Wen Yong Guo. "A Rotary Spiral Array Applied in Near-Field Acoustical Holography." Applied Mechanics and Materials 551 (May 2014): 202–9. http://dx.doi.org/10.4028/www.scientific.net/amm.551.202.

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This paper presents a new method to apply a spiral array in near-field acoustical holography (NAH). Usually, a NAH array needs much more microphones than a beamforming array does. Superior to a normal regular planar grid array or linear scanning array, this spiral array rotates to get more measuring data. Without a static referring microphone, a numerical method was designed to estimate the phase information measured at different time. Numerical simulations and a series experiment showed that this method is adequate for the sound below 450Hz. It is especially useful for using a random planar a

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18

Li, Xiaotong, Anthony Gachagan, and Paul Murray. "Design of 2D Sparse Array Transducers for Anomaly Detection in Medical Phantoms." Sensors 20, no. 18 (2020): 5370. http://dx.doi.org/10.3390/s20185370.

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Aperiodic sparse 2D ultrasonic array configurations, including random array, log spiral array, and sunflower array, have been considered for their potential as conformable transducers able to image within a focal range of 30–80 mm, at an operating frequency of 2 MHz. Optimisation of the imaging performance of potential array patterns has been undertaken based on their simulated far field directivity functions. Two evaluation criteria, peak sidelobe level (PSL) and integrated sidelobe ratio (ISLR), are used to access the performance of each array configuration. Subsequently, a log spiral array

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19

Wills, Angus, Manuj Awasthi, Charitha de Silva, Danielle Moreau, and Con Doolan. "Design and characterisation of a 3-D microphone array for windtunnel measurements." Journal of the Acoustical Society of America 154, no. 4_supplement (2023): A103. http://dx.doi.org/10.1121/10.0022935.

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A three-dimensional (3-D) array of GRAS 40PH-10 CCP Free-field Array Microphones has been designed for use in the UNSW anechoic wind tunnel (UAT) for aeroacoustic measurements. The array consists of 192 microphones split into three identical planar arrays of 64 microphones which are placed on both sides and above the potential core of the open-jet that issues into the wind tunnel test section. The planar arrays feature an Underbrink spiral comprised of eight arms of eight microphones each. The spiral configuration was selected to maximize signal-to-noise ratio (SNR) and minimize the beamwidth

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20

Encino, Kleiverg, Marco A. Panduro, Alberto Reyna, and David H. Covarrubias. "Novel Design Techniques for the Fermat Spiral in Antenna Arrays, for Maximum SLL Reduction." Micromachines 13, no. 11 (2022): 2000. http://dx.doi.org/10.3390/mi13112000.

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This paper presents novel design techniques for the Fermat spiral, considering a maximum side lobe level (SLL) reduction. The array system based on a Fermat spiral configuration considers techniques based on uniform and non-uniform amplitude excitation. The cases of uniform amplitude excitation are the golden angle and the optimization of the angular separations. The cases of non-uniform amplitude excitations consider a raised cosine distribution and the optimization of the amplitude excitations through the Fermat spiral array. In this study, the method of genetic algorithms (GA) was used in t

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21

Martínez, O., C. J. Martín, G. Godoy, and L. G. Ullate. "2D array based on fermat spiral." Physics Procedia 3, no. 1 (2010): 399–406. http://dx.doi.org/10.1016/j.phpro.2010.01.052.

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22

KLEVECZ, ROBERT R., JAMES BOLEN, and OSCAR DURÁN. "SELF-ORGANIZATION IN BIOLOGICAL TISSUES: ANALYSIS OF ASYNCHRONOUS AND SYNCHRONOUS PERIODICITY, TURBULENCE AND SYNCHRONOUS CHAOS EMERGENT IN COUPLED CHAOTIC ARRAYS." International Journal of Bifurcation and Chaos 02, no. 04 (1992): 941–53. http://dx.doi.org/10.1142/s0218127492000549.

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Large discrete arrays of chaotic attractors, coupled by diffusion, organize into asynchronous periodic spiral waves, synchronous periodic bands, turbulent fields or synchronous chaos as a function of coupling strength and array size. Self-organization of periodic spirals in both two and three dimensional arrays of nonexcitable systems appears to require the early establishment of an antipodal phase relationship between the few cells that will form the vortex. Cells within or close to the vortex maintain low z amplitude, near limit cycle trajectories, with stable, well-defined phase relationshi

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23

Rossi, Stefano, Alessandro Ramalli, Fabian Fool, and Piero Tortoli. "High-Frame-Rate 3-D Vector Flow Imaging in the Frequency Domain." Applied Sciences 10, no. 15 (2020): 5365. http://dx.doi.org/10.3390/app10155365.

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Ultrasound vector Doppler techniques for three-dimensional (3-D) blood velocity measurements are currently limited by low temporal resolution and high computational cost. In this paper, an efficient 3-D high-frame-rate vector Doppler method, which estimates the displacements in the frequency domain, is proposed. The novel method extends to 3-D an approach so far proposed for two-dimensional (2-D) velocity measurements by approximating the (x, y, z) displacement of a small volume through the displacements estimated for the 2-D regions parallel to the y and x directions, respectively. The new me

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24

Xu, Jie, Hui Li, You-Ling zhou, et al. "Performance analysis of vortex acoustic wave based on uniform circular array." Journal of Physics: Conference Series 2078, no. 1 (2021): 012069. http://dx.doi.org/10.1088/1742-6596/2078/1/012069.

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Abstract As a carrier for information and energy, acoustic waves have been applied in underwater communication widely, however, the narrow band and low transmission speed are the main problems. Whether in the field of optics or electromagnetic waves, the orbital angular momentum (OAM) represents the natural properties of the spiral phase structure. By introducing the OAM into the acoustics field, the transmission capacity and spectrum efficiency of the underwater acoustic communication system can be expanded. Based on the analysis and detection of the vortex acoustic wave generated by the circ

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Alnafjan, Fadwa, Melville J. da Cruz, and Catherine M. McMahon. "Characteristics of Medial and Lateral Wall Cochlear Implant Arrays Demonstrated with Cone Beam CT and Evoked Electrical Auditory Brainstem Responses." Otology & Neurotology 46, no. 4 (2025): 364–71. https://doi.org/10.1097/mao.0000000000004431.

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Hypothesis This study investigates how electrode array types—straight versus perimodiolar—affect cochlear implant (CI) placement (i.e., modiolar proximity and angular depth) and outcomes using cone beam computed tomography (CBCT) and evoked electrical auditory brainstem responses (eABR). Background Cochlear implants (CIs) have revolutionized auditory rehabilitation, yet optimizing electrode placement remains crucial for improving speech perception and pitch discrimination. Array designs influence electrode proximity to neural structures, impacting neural stimulation efficacy. Methods We analyz

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Speedie, Jessica, Richard A. Booth, and Ruobing Dong. "Observing Planet-driven Dust Spirals with ALMA." Astrophysical Journal 930, no. 1 (2022): 40. http://dx.doi.org/10.3847/1538-4357/ac5cc0.

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Abstract Atacama Large Millimeter/submillimeter Array (ALMA) continuum observations of thermal emission from the dust component of protoplanetary disks have revealed an abundance of substructures that may be interpreted as evidence for embedded planets, but planet-driven spiral arms—perhaps one of the most compelling lines of evidence—have proven comparatively elusive. In this work, we test the capabilities of ALMA to detect the planet-driven spiral signal in continuum emission. Carrying out hydrodynamic simulations and radiative transfer calculations, we present synthetic Band 7 continuum ima

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27

Vallecchi, A., R. J. Langley, and A. G. Schuchinsky. "Voltage Controlled Intertwined Spiral Arrays for Reconfigurable Metasurfaces." International Journal of Antennas and Propagation 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/171637.

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Reconfigurable bistate metasurfaces composed of interwoven spiral arrays with embeddedpindiodes are proposed for single and dual polarisation operation. The switching capability is enabled bypindiodes that change the array response between transmission and reflection modes at the specified frequencies. The spiral conductors forming the metasurface also supply the dc bias for controllingpindiodes, thus avoiding the need of additional bias circuitry that can cause parasitic interference and affect the metasurface response. The simulation results show that proposed active metasurfaces exhibit goo

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28

Xu, Wencong, Bingshu Chen, Yandong Li, Yue Hu, Jianxun Li, and Zijing Zeng. "Dir-MUSIC Algorithm for DOA Estimation of Partial Discharge Based on Signal Strength Represented by Antenna Gain Array Manifold." Sensors 22, no. 14 (2022): 5406. http://dx.doi.org/10.3390/s22145406.

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Inspection robots are widely used in the field of smart grid monitoring in substations, and partial discharge (PD) is an important sign of the insulation state of equipment. PD direction of arrival (DOA) algorithms using conventional beam forming and time difference of arrival (TDOA) require large-scale antenna arrays and high computational complexity, making them difficult to implement on inspection robots. To address this problem, a novel directional multiple signal classification (Dir-MUSIC) algorithm for PD direction finding based on signal strength is proposed, and a miniaturized directio

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29

Liu, Yu. "Adaptive Array Reduction in Acoustic Beamforming (Virtual Presentation)." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 1 (2023): 6745–56. http://dx.doi.org/10.3397/in_2022_1021.

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Acoustic beamforming is a widely used source localisation technique where an array of microphones is placed in the acoustic far-field to gather unique contributions of acoustic pressure waves. The spatial and temporal relationship of these pressure contributions are sensitive to the microphone array design. To date, most acoustic beamformers are constructed using a spiral-based array configuration, yet in recent years, a new technique for developing array patterns has emerged that unlocks flexibility and convenient customisation, yielding improved acoustic source imaging to its predecessors. T

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Hyland, Lucas J., Simon P. Ellingsen, and Mark J. Reid. "Structure of the Milky Way: View from the Southern Hemisphere." Proceedings of the International Astronomical Union 13, S336 (2017): 154–57. http://dx.doi.org/10.1017/s1743921318000832.

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AbstractThe exclusive association of Class II methanol masers with high mass star formation regions and in turn spiral arms, makes them ideal tracers of spiral structure. The bright and compact nature of masers also makes them good sources for Very Long Baseline Interferometry, with their fluxes visible on some of the longest terrestrial baselines. The success of the BeSSeL (Bar and Spiral Structure Legacy) project has demonstrated the use of masers in large scale high–precision trigonometric parallax surveys. This survey was then able to precisely map the spiral arms visible from the Northern

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31

Jafargholi, A., M. Kamyab, and M. Veysi. "Spiral array architecture, design, synthesis and application." IET Microwaves, Antennas & Propagation 5, no. 5 (2011): 503. http://dx.doi.org/10.1049/iet-map.2010.0301.

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32

Chao Kang, Chia, and Chia Yang Kang. "Circularly polarize antenna array for electromagnetic energy harvesting." International Journal of Engineering & Technology 7, no. 2.29 (2018): 1. http://dx.doi.org/10.14419/ijet.v7i2.29.13114.

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Electromagnetic energy harvesting from ambient sources have been presented more than 50 years. In this paper, electromagnetic energy harvesting by using circular polarize antenna array is presented. The proposed antenna is having 2 similar size of spiral inductor that feed by microstrip feed line. The gain, momentum visualization were investigated. The circular polarize antenna are fabricated on Roger 4003 substrates. Based on the observations, it is expected that the gain obtained by the antenna array is higher than the single element antenna. The simulation results show that 3.22 dBi gain ca

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Yao, Yuan, Qiuyue Ge, Junsheng Yu, and Xiaodong Chen. "A Novel Antenna for UHF RFID Near-Field Applications." Electronics 10, no. 11 (2021): 1310. http://dx.doi.org/10.3390/electronics10111310.

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This paper proposed a novel antenna for ultra-high frequency (UHF) radio frequency identification (RFID) near-field applications with uniform distribution of the electric field along the x-axis (Ex), and the y-axis (Ey). The proposed antenna adopted a spiral structure to achieve broadband and multi-polarization. The novel antenna achieved good impedance matching within 860–960 MHz. Using a ground plate, the proposed antenna achieved low far-field gain and a maximum gain of less than −11 dBi. The component of the excited electric field Ex and Ey parallel to the antenna surface was uniformly dis

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Zhu, Kaiqi, Yilin Wu, Mengdi Li, Xiaofei Li, Yaru Gao, and Xianlong Liu. "Flexible Construction of a Partially Coherent Optical Array." Photonics 11, no. 2 (2024): 133. http://dx.doi.org/10.3390/photonics11020133.

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In this article, we introduce a flexible and programmable method to construct a multi-parameter optical array to meet urgent and personalized needs, such as multi-particle capture and manipulation and material processing, and enrich the degree of freedom when constructing an optical array. As an example, uniform and nonuniform spiral coherent lattices (SCLs) and their propagation properties are investigated both theoretically and experimentally. Various intensity distributions, e.g., a uniform and nonuniform spiral light field, can be achieved by manipulating the diverse parameters. Additional

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Luo, Win-Jet, C. Bambang Dwi Kuncoro, Pratikto, and Yean-Der Kuan. "Single-Layer Transmitter Array Coil Pattern Evaluation toward a Uniform Vertical Magnetic Field Distribution." Energies 12, no. 21 (2019): 4157. http://dx.doi.org/10.3390/en12214157.

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A uniform magnetic field distribution is a critical aspect in the transmitter array coil design process for achieving a homogenous vertical magnetic field distribution. The free position and orientation features can thus be implemented in the wireless power charging system. This paper presents vertical magnetic field distribution generated by a single-layer circular flat spiral air core transmitter array coil model analysis and evaluation using a numerical analysis method. This method is developed based on the off-symmetry axis magnetic field distribution due to a circular current loop derived

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Ma, Li, Zijun Zhan, Chao Chen, Chunxiang Liu, and Chuanfu Cheng. "Generation of ultrashort vortex pulses by spiral array." Optics & Laser Technology 155 (November 2022): 108354. http://dx.doi.org/10.1016/j.optlastec.2022.108354.

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Jafargholi, Amir, and Manouchehr Kamyab. "PATTERN OPTIMIZATION IN AN UWB SPIRAL ARRAY ANTENNA." Progress In Electromagnetics Research M 11 (2010): 137–51. http://dx.doi.org/10.2528/pierm10010302.

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Chew, Elaine, and Yun-Ching Chen. "Real-Time Pitch Spelling Using the Spiral Array." Computer Music Journal 29, no. 2 (2005): 61–76. http://dx.doi.org/10.1162/0148926054094378.

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Saito, Atsushi, Yuhei Ogawa, Daiki Oka, Shigetoshi Ohshima, and Kensuke Nakajima. "Investigation of Microwave Crosstalk in Spiral-MKIDs Array." IEEE Transactions on Applied Superconductivity 27, no. 4 (2017): 1–4. http://dx.doi.org/10.1109/tasc.2016.2631940.

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Suto, Koya. "An Unbiased Spiral Array for MASW Data Acquisition." First Break 41, no. 8 (2023): 89–94. http://dx.doi.org/10.3997/1365-2397.fb2023067.

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Stengrim, Matthew, Heath Faircloth, Brielle Wagner, et al. "Testing a spiral beamforming array for airborne acoustics." Journal of the Acoustical Society of America 156, no. 4_Supplement (2024): A19. https://doi.org/10.1121/10.0034958.

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Airborne acoustic signature characterization of watercraft is one of the interests of Naval Surface Warfare Center Carderock Division (NSWCCD). A twenty-element planar spiral array was recently designed for this purpose. In June 2024, the system was used in a collaborative measurement campaign with East Carolina University in Wanchese, NC. The array was fixed to an offshore platform and recorded pure tone bursts of 250, 500, 1000, and 2000 Hz from a Long Range Acoustic Device (LRAD) positioned at ranges from 250 m up to 2 km. Within a 10 min period, estimations of transmission loss and SNR in

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Mazzolini, Margaret, Janice Long, and Rachel Webster. "Radio Continuum Maps of Southern Barred Spiral Galaxies." International Astronomical Union Colloquium 157 (1996): 239–41. http://dx.doi.org/10.1017/s0252921100049836.

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AbstractA sample of southern spiral galaxies are being observed at 20 and 13 cm with the Australia Telescope Compact Array in order to look for examples of anomalous outflows from the nuclear region. In this paper we discuss the radio continuum maps of the three barred spiral galaxies observed to date.

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Jia, Haolong, Guozhong Lei, Wenhui Wang, et al. "100 fps single-pixel imaging illuminated by a Fermat spiral fiber laser array." Advanced Imaging 2, no. 2 (2025): 021002. https://doi.org/10.3788/ai.2025.10025.

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Fraundorf, P., and Shuhan Lin. "Spiral Powder Overlays." Microscopy Today 13, no. 1 (2005): 8–11. http://dx.doi.org/10.1017/s1551929500050781.

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Whether you encounter electron powder diffraction patterns everyday, or run across them only rarely, interpreting them may require a bit of preparation. But it's easy to lose track of the numbers for your microscope's camera constant, not to mention the bewildering array of lattice parameters and symmetries that one may encounter in the microscope. In that context, we describe overlays you might want to assemble for measuring camera constants, and for recognizing crystal systems most likely to yield electron powder diffraction patterns in your lab. Pulling this out of a drawer and/or computer

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Etellisi, Ehab A., Mohamed A. Elmansouri, and Dejan S. Filipovic. "Antenna Systems for Simultaneous Transmit and Receive (STAR) Applications." International Symposium on Microelectronics 2017, no. 1 (2017): 000590–94. http://dx.doi.org/10.4071/isom-2017-tha41_116.

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Abstract Several novel wideband co-polarized circulator-less monostatic antenna and array designs for co-channel simultaneous transmit and receive (STAR) applications are presented. The monostatic STAR apertures are demonstrated first by utilizing multi-arm spiral antennas where a set of arms is used for transmitting (TX) and the other set for receiving (RX). Then, square and hexagonal broadside STAR arrays utilizing closely-spaced spiral antennas are introduced. Finally, (quasi) omnidirectional circular STAR arrays based on phase modes orthogonality principles are realized using four wideband

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Mazzolini, Margaret, and Rachel Webster. "Preliminary Radio Continuum Maps of Three Spiral Galaxies." Publications of the Astronomical Society of Australia 13, no. 2 (1996): 107–20. http://dx.doi.org/10.1017/s1323358000020646.

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AbstractThe Australia Telescope Compact Array has been used in two 6 km configurations to make 12 hour observations of the radio continuum structure of three spiral galaxies at 1380 MHz and 2378 MHz. Radio maps of NGC 1792, 6300 and 1097 are presented here, as part of a survey to find examples of anomalous radio structures in spiral galaxies.

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HUANG, LONG, JUN MA, JUN TANG, and FAN LI. "TRANSITION OF ORDERED WAVES IN NEURONAL NETWORK INDUCED BY DIFFUSIVE POISONING OF ION CHANNELS." Journal of Biological Systems 21, no. 01 (2013): 1350002. http://dx.doi.org/10.1142/s0218339013500022.

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Normal physiological activities are often affected by some drugs, and some ion channels are blocked due to the katogene of drugs. This paper investigates the propagation of ordered waves in neuronal networks induced by diffusive poisoning, where the process is measured by increasing the number of neurons in the poisoned area of the networks. A coefficient of poisoning K is defined to measure the time units from one poisoned site to the adjacent site, a smaller K means that more neurons are poisoned in a certain period (a higher poisoning speed). A statistical factor of synchronization R in the

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Richter, Bernhard, Antje Aschendorff, Petra Lohnstein, Hartmut Husstedt, Heiner Nagursky, and Roland Laszig. "Clarion 1.2® standard electrode array with partial space-filling positioner: radiological and histological evaluation in human temporal bones." Journal of Laryngology & Otology 116, no. 7 (2002): 507–13. http://dx.doi.org/10.1258/002221502760132584.

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The purpose of this study was to evaluate whether use of a positioner for situating the Clarion 1.2® standard electrode array in close proximity to the modiolus, causes damage to fine intra-cochlear structures, and to provide a comparison with results obtained for insertions of the array performed without a positioner. The study was performed in seven freshly frozen human temporal bones. Electrode location and intra-cochlear trauma was analysed using cross-sectional imaging and histological analysis. Insertion of the Clarion® array did not reveal major trauma. The devices inserted with the pos

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Aldeman, Matthew R., and Ganesh Raman. "Experimental determination of the effects of boundary reflection on the angular resolution of microphone arrays." Building Acoustics 25, no. 3 (2018): 249–86. http://dx.doi.org/10.1177/1351010x18768746.

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The Rayleigh criterion has long been considered the standard criterion for angular resolution of imaging systems, including microphone arrays. However, advanced beamforming methods have been developed in the past 20 years that have dramatically improved the angular resolution of microphone array systems. In this investigation, the angular resolution performance of three scaled microphone arrays and one alternative array geometry were tested with both approximately free-field and reflective boundary conditions. All of the arrays were subjected to a thorough regimen of testing with broadband aco

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Beck, R., M. Ehle, R. F. Haynes, and J. I. Harnett. "ATCA Radio Polarization Observations of NGC 1566 and NGC 1672." Symposium - International Astronomical Union 158 (1994): 358–60. http://dx.doi.org/10.1017/s0074180900107910.

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NGC 1566 and NGC 1672 have successfully been observed in radio continuum at 6 cm (26″ HPBW) with the Australia Telescope Compact Array (ATCA) using a 375-m array. We have detected for the first time with this telescope linearly polarized radio emission from two southern hemisphere spiral galaxies, NGC 1566 and NGC 1672.

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