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Journal articles on the topic 'Multi-beam propagation'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 July 2025

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1

Yaln Ata, Yalcin Ata, and Yahya Baykal Yahya Baykal. "Anisotropy effect on multi-Gaussian beam propagation in turbulent ocean." Chinese Optics Letters 16, no. 8 (2018): 080102. http://dx.doi.org/10.3788/col201816.080102.

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2

Ma, Xiaolu, Dajun Liu, Yaochuan Wang, Hongming Yin, Haiyang Zhong, and Guiqiu Wang. "Propagation of Rectangular Multi-Gaussian Schell-Model Array Beams through Free Space and Non-Kolmogorov Turbulence." Applied Sciences 10, no. 2 (2020): 450. http://dx.doi.org/10.3390/app10020450.

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In this paper, rectangular multi-Gaussian Schell-model (MGSM) array beams, which consists N×D beams in rectangular symmetry, are first introduced. The analytical expressions of MGSM array beams propagating through free space and non-Kolmogorov turbulence are derived. The propagation properties, such as normalized average intensity and effective beam sizes of MGSM array beams are investigated and analyzed. It is found that the propagation properties of MGSM array beams depend on the parameters of the MGSM source and turbulence. It can also be seen that the beam size of Gaussian beams translated

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3

Ma, Ming, Xi Luan, Bin Li, and Jian Jun Wu. "Propagation Delay Characteristics Analysis in LEO Satellite Multi-Beam Antenna Coverage." Advanced Materials Research 791-793 (September 2013): 1931–35. http://dx.doi.org/10.4028/www.scientific.net/amr.791-793.1931.

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In this paper a calculation model of propagation delays of satellite beams is introduced for LEO multi-beam satellite communications system. Based on actual parameters and beam coverage patterns of the Iridium and Globalstar system, the maximum propagation delay differentials in several typical beams from the center to the edge of the satellites coverage are calculated. Analysis of these results can provide reference for analyzing the feasibility of LEO multi-beam satellite system compatible with uplink synchronization in LTE.

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4

Huang, Kai, Yonggen Xu, and Yuqiang Li. "Average Intensity of a Laguerre—Gaussian Vector Vortex Beam through Inhomogeneous Atmospheric Turbulence." Photonics 10, no. 11 (2023): 1189. http://dx.doi.org/10.3390/photonics10111189.

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We investigate the evolution properties of a partially coherent Laguerre–Gaussian vector vortex (LGVV) beam through inhomogeneous atmospheric turbulence. Analytical formulae for the elements of a cross-spectral density matrix of a partially coherent LGVV beam propagating in turbulence are derived with the help of the extended Huygens–Fresnel principle. Our outcomes demonstrate that the normalized initial profile of a partially coherent beam with concentric dark rings gradually evolves into a Gaussian-like beam profile in turbulence. We also find that the beam is emitted at a large zenith angle

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5

Piatrou, P. K., and N. A. Khilo. "Bessel beam parameter optimization with adjustable aberrator." Proceedings of the National Academy of Sciences of Belarus. Physics and Mathematics Series 60, no. 4 (2025): 327–34. https://doi.org/10.29235/1561-2430-2024-60-4-327-334.

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Transformation of ordinary laser beams of Gaussian type into the ones of Bessel type gives a number of advantages. In particular, it may improve a multi-mode beam energy distribution in the far zone and keep it stable over a long range of propagation distances. A usual method of the Bessel beam formation is based on the use of one or a pair of axicons, at that the latter is used for creating annular beams with small conic angles optimized for long range propagation. The disadvantage of axicons is their fixed geometry not allowing the beam parameter adjustment. An additional Bessel beam improve

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6

Huang, Kelin, Xun Wang, and Zhirong Liu. "Nonparaxial propagation of a multi-Gaussian Schell-model beam." Journal of Optics 17, no. 8 (2015): 085603. http://dx.doi.org/10.1088/2040-8978/17/8/085603.

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7

Huang, Kelin, Xun Wang, and Zhirong Liu. "Nonparaxial propagation of a rectangular multi-Gaussian Schell-model beam." Optics Communications 356 (December 2015): 25–33. http://dx.doi.org/10.1016/j.optcom.2015.07.037.

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8

Yuan, Gang. "X-ray laser beam propagation in multi-pulse pumping plasmas." Physics Letters A 212, no. 5 (1996): 258–62. http://dx.doi.org/10.1016/0375-9601(96)00057-6.

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9

RUSSELL, TIMOTHY H., SHAWN M. WILLIS, MATTHEW B. CROOKSTON, and WON B. ROH. "STIMULATED RAMAN SCATTERING IN MULTI-MODE FIBERS AND ITS APPLICATION TO BEAM CLEANUP AND COMBINING." Journal of Nonlinear Optical Physics & Materials 11, no. 03 (2002): 303–16. http://dx.doi.org/10.1142/s0218863502001036.

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Laser beam cleanup properties of stimulated Raman scattering (SRS) in a multi-mode fiber have been characterized. It is shown that a fiber, which supports propagation of a highly aberrated pump beam, can generate a Gaussian-like Stokes beam consisting of one or more orders of Stokes components. The beam cleanup properties are found to be similar to those of stimulated Brillouin scattering, which are briefly reviewed herein. The dramatic enhancement in beam quality achievable through SRS clearly demonstrates the potential utility of fiber-based Raman beam cleanup/combining devices for laser bri

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10

Wang, Lifeng, Wanlin Guo, and Haiyan Hu. "Group velocity of wave propagation in carbon nanotubes." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 464, no. 2094 (2008): 1423–38. http://dx.doi.org/10.1098/rspa.2007.0349.

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The group velocities of longitudinal and flexural wave propagations in single- and multi-walled carbon nanotubes are studied in the frame of continuum mechanics. The dispersion relations between the group velocity and the wavenumber for flexural and longitudinal waves, described by a beam model and a cylindrical shell model, are established for both single- and multi-walled carbon nanotubes. The effect of microstructures in carbon nanotubes on the wave dispersion is revealed through the non-local elastic models of a beam and a cylindrical shell, including the second-order gradient of strain an

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11

Li, Cheng Mei, Jian Jun Wu, Xiao Ning Zhang, Xi Luan, and Hai Ge Xing. "Propagation Delay Difference Estimation for Initial Random Access in LTE Compatible Mobile Satellite Communications System." Advanced Materials Research 846-847 (November 2013): 647–50. http://dx.doi.org/10.4028/www.scientific.net/amr.846-847.647.

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In this paper, a two-step propagation delay difference estimation method is proposed for LTE compatible multi-beam satellite systems to ensure the initial random access (RA). For GEO satellite system, there exists a large propagation delay difference, we cannot directly apply the LTE delay estimation method. To deal with this issue, we first divide a satellite beam into some layered small sub-areas according to the different delay difference values. Then, two types of Physical Random Access Channel (PRACH) preamble burst format are given. The detailed PRACH parameters are provided. Finally, si

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12

Chen, Pengyun, Xiaolong Chen, Jian Shen, and Teng Ma. "Single Ping Filtering of Multi-Beam Sounding Data Based on Alpha Shapes." Marine Technology Society Journal 55, no. 1 (2021): 106–14. http://dx.doi.org/10.4031/mtsj.55.1.9.

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AbstractFrom the standpoint of complex marine environments relative to underwater acoustic signal propagation, the application of multi-beam systems for the filtering and processing of multi-beam sounding data is critical. However, currently existing automatic filtering methods estimate data, which involve several calculations and require the respective computer to possess significant processing capabilities. In this study, raw data are measured using an interferometer multi-beam echo sounder, and the characteristics of the noise data are analyzed. The noise data are discontinuous; however, ac

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13

Rapoport, Yuriy, Vladimir Grimalsky, Viktor Fedun, et al. "Model of the propagation of very low-frequency beams in the Earth–ionosphere waveguide: principles of the tensor impedance method in multi-layered gyrotropic waveguides." Annales Geophysicae 38, no. 1 (2020): 207–30. http://dx.doi.org/10.5194/angeo-38-207-2020.

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Abstract. The modeling of very low-frequency (VLF) electromagnetic (EM) beam propagation in the Earth–ionosphere waveguide (WGEI) is considered. A new tensor impedance method for modeling the propagation of electromagnetic beams in a multi-layered and inhomogeneous waveguide is presented. The waveguide is assumed to possess the gyrotropy and inhomogeneity with a thick cover layer placed above the waveguide. The influence of geomagnetic field inclination and carrier beam frequency on the characteristics of the polarization transformation in the Earth–ionosphere waveguide is determined. The new

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14

Cai, Yangjian, and Qiang Lin. "Partially coherent flat-topped multi-Gaussian–Schell-model beam and its propagation." Optics Communications 239, no. 1-3 (2004): 33–41. http://dx.doi.org/10.1016/j.optcom.2004.05.032.

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15

Ji, Xiaoling, and Baida Lü. "Propagation of a flattened Gaussian beam through multi-apertured optical ABCD systems." Optik 114, no. 9 (2003): 394–400. http://dx.doi.org/10.1078/0030-4026-00285.

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16

Jeonga, Hyunjo, and Lester W. Schmerr. "Ultrasonic beam propagation in highly anisotropic materials simulated by multi-Gaussian beams." Journal of Mechanical Science and Technology 21, no. 8 (2007): 1184–90. http://dx.doi.org/10.1007/bf03179034.

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17

Shi, Xinrong, Xiangrui Zhang, and Jinjin Zan. "Research on Multibeam Line Measurement Problem Based on Iterative Algorithms." Highlights in Science, Engineering and Technology 82 (January 26, 2024): 126–33. http://dx.doi.org/10.54097/en3t7t48.

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With the continuous advancement of marine resource development, an efficient and reasonable multi beam acoustic survey line design scheme is crucial for accurate sea area measurement. Firstly, in order to make the model closer to the actual complex scene, a three-dimensional coverage model was derived that comprehensively considers the relative angle between the measurement line and the normal direction of the seabed terrain slope projected on the horizontal plane, referring to the three-dimensional sound beam propagation characteristics of multi beam sound waves. Then, based on the working pr

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18

Lisheng, YAO, Fion Sze Yan Yeung, ZHANG Wanlong, and YUAN Xiaocong. "P‐13.15: Optical Field Modulator Based on Polarization Volume Grating." SID Symposium Digest of Technical Papers 56, S1 (2025): 1634–37. https://doi.org/10.1002/sdtp.19170.

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Liquid crystal (LC) has birefringence characteristics, and the liquid crystal component designed with special structure can realize the control of beam phase, amplitude and spatial dimension [1, 2]. Liquid crystal polarization volume grating (PVG) is a kind of geometric phase grating that generates volume Bragg effect through periodic rotation of liquid crystal in space. PVG has unique optical properties such as high diffraction efficiency, large diffraction angle, wide response bandwidth and polarization selectivity [3, 4]. In this paper, we use PVG as the coupler of the plate waveguide, and

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19

Yu, Zhiyong, Liboyuan Lan, and Qian Li. "Optimization Research Based on a Multi-Beam Ranging System." Journal of Innovation and Development 10, no. 2 (2025): 27–29. https://doi.org/10.54097/tw7xxq46.

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This paper studies the deep-water multi-beam swath system, analyzing issues such as the coverage width of swaths and the overlap rate between adjacent swaths, and establishes appropriate mathematical models to address optimization problems in the field of marine depth sounding using multi-beam systems. Firstly, based on the knowledge of multi-beam depth sounding technology, a corresponding mathematical model is established. In the seafloor measurement system, data such as coverage width (), transducer opening angle (), water depth (), the distance between adjacent survey lines (), and overlap

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20

Ramis, R., and J. Meyer-Ter-Vehn. "On thermonuclear burn propagation in a pre-compressed cylindrical DT target ignited by a heavy ion beam pulse." Laser and Particle Beams 32, no. 1 (2013): 41–47. http://dx.doi.org/10.1017/s0263034613000839.

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AbstractThermonuclear ignition and burn propagation in pre-compressed cylindrical deuterium-tritium (DT) targets is studied by two-dimensional radiation hydrodynamics simulations using the code MULTI-2D. Special attention is paid to self-sustained steady burn wave propagation. Peak temperatures and burn wave velocity scale with the density-radius product of the fuel, and wave propagation is obtained for (ρR)DT ≥ 0.45 g/cm2. Radiation transport is identified as the dominant mechanism to drive the wave. Details of ignition by a heavy ion beam pulse are also presented. Limitations in the physics

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21

Cao, Bao Yin, Yong Liu, and Ling Yang. "Research of Numerical Simulation for Multi-Core Photonic Crystal Fiber Couplers." Applied Mechanics and Materials 427-429 (September 2013): 945–48. http://dx.doi.org/10.4028/www.scientific.net/amm.427-429.945.

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In this paper, multi-core photonic crystal fiber couplers are characterized and numerically simulated with Mangan et als theory and beam propagation method. We propose a kind of 1×3 multi-core photonic crystal fiber couplers with broadband characteristics and the identical split ratio within the range from 1300nm to 1800nm. If the proper length of the couplers is chosen, light couple intensity is completely the same by periphery there-core fiber with broadband characteristics. It provides a theoretical basis for the practice of multi-core photonic crystal fiber couplers.

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22

Syahrul, Maya Sari, Iswan Rina, and Nurweni Putri. "KONTRUKSI PT-Symmetry MULTI DIMER PADA DOMAIN TAK HINGGA." Jurnal Lebesgue : Jurnal Ilmiah Pendidikan Matematika, Matematika dan Statistika 4, no. 3 (2023): 1988–94. http://dx.doi.org/10.46306/lb.v4i3.528.

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Parity-Time Symmetry, or abbreviated as -Symmetry, can be explained as the propagation of an optical beam in two bound waveguides, where one waveguide experiences strengthening and the other waveguide experiences weakening, with each intensity having the same value. Then, the two waveguides are known as dimers, so the phenomenon is called dimer -Symmetry. Furthermore, the -Symmetry dimer is expanded into a system consisting of a collection of -Symmetry Dimers, where each dimer is bound by a binding constant. The result of this expansion is called the multi dimer -Symmetry system. Research on t

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23

Ainslie, Michael A., Robert M. Laws, Michael J. Smith, and Alexander O. MacGillivray. "Source and propagation modelling scenarios for environmental impact assessment: Model verification." Journal of the Acoustical Society of America 156, no. 3 (2024): 1489–508. http://dx.doi.org/10.1121/10.0028135.

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Evaluation of possible effects of underwater sound on aquatic life requires quantification of the sound field. A marine sound source and propagation modelling workshop took place in June 2022, whose objectives were to facilitate the evaluation of source and propagation models and to identify relevant metrics for environmental impact assessment. The scope of the workshop included model verification (model-model comparison) and model validation (model-measurement comparison) for multiple sources, including airguns, a low-frequency multi-beam echo sounder, and a surface vessel. Several verificati

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24

Low, Ching Yu, and Ramlee Kamarudin Muhammad. "5G Fixed Beam Switching on Microstrip Patch Antenna." International Journal of Electrical and Computer Engineering (IJECE) 7, no. 2 (2017): 975–80. https://doi.org/10.11591/ijece.v7i2.pp975-980.

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5G technology is using millimeter-wave band to improve the wireless communication system. However, narrow transmitter and receiver beams have caused the beam coverage area to be limited. Due to propagation limitations of mm wave band, beam forming technology with multi-beam based communication system, has been focused to overcome the problem. In this letter, a fixed beam switching method is introduced. By changing the switches, four different configurations of patch array antennas are designed to investigate their performances in terms of radiation patterns, beam forming angle, gain, half-powe

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25

Nasaj Moghaddam, Hesamoddin, Ali Keyhani, and Iman Aghayan. "Modelling of Crack Propagation in Layered Structures Using Extended Finite Element Method." Civil Engineering Journal 2, no. 5 (2016): 180–88. http://dx.doi.org/10.28991/cej-2016-00000024.

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Crack propagation in structures is an important issue which is engineers and designers should consider. Modeling crack propagation in structures and study the behavior of this phenomenon can give a better insight to engineers and designers for selecting the construction’s materials. Extended finite element method (XFEM) was used successfully in the past few years for simulating crack initiation and propagation in sophisticated and complex geometries in elastic fracture mechanics. In this paper, crack propagation in three-point bending beam including initial crack was modeled based on ABAQUS so

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26

Wang, Dan Sheng, and Hong Ping Zhu. "Wave Propagation Based Multi-Crack Identification in Beam Structures through Anti-Resonances Information." Key Engineering Materials 293-294 (September 2005): 557–64. http://dx.doi.org/10.4028/www.scientific.net/kem.293-294.557.

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Cracks bring a serious threat to safety of structures. Most of the failures and fractures of engineering structures are due to initial cracks or fatigue cracks of materials. So it is very important to analyze the vibration characteristics and to identify the damage of cracked structures. A method for multi-crack identification based on wave propagation is proposed in this paper, which makes use of the driving-point mechanical impedance characteristics of the cracked beams stimulated by harmonic force. The proposed identification method is used to characterize the local discontinuity due to cra

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27

Kashani, F. D., M. Reza Hedayati Rad, Z. Firozzadeh, and M. Reza Mahzoun. "Beam propagation analysis of a multi-laser diode FSO system through free space." Journal of Optics 13, no. 10 (2011): 105709. http://dx.doi.org/10.1088/2040-8978/13/10/105709.

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28

Shaaban, Adel, M. Sayed, Mohamed Farhat O. Hameed, et al. "Fast parallel beam propagation method based on multi-core and many-core architectures." Optik 180 (February 2019): 484–91. http://dx.doi.org/10.1016/j.ijleo.2018.11.111.

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29

Ma, Xiaolu, Guiqiu Wang, Haiyang Zhong, Yaochuan Wang, and Dajun Liu. "Propagation of a rectangular multi-gaussian schell-model vortex beam in uniaxial crystal." Optik 221 (November 2020): 165318. http://dx.doi.org/10.1016/j.ijleo.2020.165318.

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30

Chen, Tao. "Investigations on flexural wave propagation of a periodic beam using multi-reflection method." Archive of Applied Mechanics 83, no. 2 (2012): 315–29. http://dx.doi.org/10.1007/s00419-012-0657-x.

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31

Urban, Mur, Ravnik Miha, and Seč David. "Controllable shifting, steering, and expanding of light beam based on multi-layer liquid-crystal cells." Scientific Reports 12, no. 1 (2022): 1–13. https://doi.org/10.1038/s41598-021-04164-0.

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Shaping and steering of light beams is essential in many modern applications, ranging from optical tweezers, camera lenses, vision correction to 3D displays. However, current realisations require increasingly greater tunability and aim for lesser speci-ficity for use in diverse applications. Here, we demonstrate tunable light beam control based on multi-layer liquid-crystal cells and external electric field, capable of extended beam shifting, steering, and expanding, using a combination of theory and full numerical modelling, both for liquid crystal orientations and the transmitted light. Spec

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32

Yang Wenbai, 杨文柏, 熊皓 Xiong Hao, 于虹 Yu Hong, 钟哲强 Zhong Zheqiang та 张彬 Zhang Bin. "内通道多场耦合作用下旋转光束的传输特性研究". Chinese Journal of Lasers 51, № 13 (2024): 1305002. http://dx.doi.org/10.3788/cjl231141.

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33

Pany, C., and S. Parthan. "Axial Wave Propagation in Infinitely Long Periodic Curved Panels." Journal of Vibration and Acoustics 125, no. 1 (2003): 24–30. http://dx.doi.org/10.1115/1.1526510.

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Propagation of waves along the axis of the cylindrically curved panels of infinite length, supported at regular intervals is considered in this paper to determine their natural frequencies in bending vibration. Two approximate methods of analysis are presented. In the first, bending deflections in the form of beam functions and sinusoidal modes are used to obtain the propagation constant curves. In the second method high precision triangular finite elements is used combined with a wave approach to determine the natural frequencies. It is shown that by this approach the order of the resulting m

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34

Aftab, H., S. Hussain, S. Mahmood, M. Haseeb, and H. Hasnain. "Neutrino beam driven instability of magnetosonic waves in the presence of oblique magnetic field and ion-neutral collisional effect in plasmas." Physica Scripta 97, no. 1 (2022): 015602. http://dx.doi.org/10.1088/1402-4896/ac4772.

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Abstract The neutrino beam driven instability of fast and slow magnetosonic waves with oblique applied magnetic field in multi-component ion, electron and neutrino beam plasma is studied. The dissipation effects of ion-neutral collisions are also included in the model. The neutrino and electron interactions through electro-weak force are included. It is found that the dissipation of ion collisions has significant effect on the phase velocity of the wave propagation and growth rate of the neutrino beam driven instability. The analytical expression of the growth rate of the fast and slow magneto

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35

Sun, Jinpeng, Heyang Qin, Sen Feng, Zhengda Hu, and Jicheng Wang. "Reflective terahertz metasurfaces enabling multi-functional polarization modulation and beam deflection." Laser Physics Letters 22, no. 5 (2025): 055901. https://doi.org/10.1088/1612-202x/add4ea.

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Abstract Polarization manipulation and beam splitting are pivotal for advancing integrated photonic systems, yet conventional devices face challenges in miniaturization and dynamic control. This study introduces a spin-sensitive H-symmetry reflective metasurface that synergizes geometric and propagation phase modulation through subwavelength meta-atom engineering, enabling full polarization decoupling, arbitrary beam deflection and independent intensity control across multiple deflection channels. By combining multi-beam systems and Jones matrix theory, we can achieve efficient conversion from

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36

Yang, Xiangyang, Wenyu Fu, and Xiaolu Zhu. "Multi-focus auto focusing characteristics of vector beam with non-uniformly correlated structure in a turbulent atmosphere." Optica Applicata 54, no. 4 (2025): 459–69. https://doi.org/10.37190/oa/195221.

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We propose a simple strategy to produce multiple longitudinal focal spots by adjusting the initial parameters of vector beam with non-uniformly correlated structure and chose electromagnetic Hermite non-uniformly correlated (EMHNUC) beams as typical examples to explore the multi-focusing characteristics of the beam propagation in turbulent atmosphere. Furthermore, we also demonstrated how to control the foci's number, intensity, and position by adjusting the vector beam's initial parameters. Finally, the influence of the turbulent atmosphere on the focal spot intensity was analyzed. These beam

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37

Ma, Qian, and Hengkai Zhao. "Capacity of a Radio Vortex Communication System Using a Partial Angular Aperture Receiving Scheme under the Horizontal Non-Kolmogorov Model." Sensors 21, no. 5 (2021): 1778. http://dx.doi.org/10.3390/s21051778.

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A partial receiving scheme based on limited angular aperture multi-beam receiving and demultiplexing can solve the difficulty caused by the divergence of the vortex beam in the conventional whole beam receiving scheme and realize the long-distance transmission of the vortex wave. The propagation of the radio vortex beam in atmospheric turbulence is of significant importance in theoretical study and practical applications. In this paper, the influence of atmospheric turbulence on the performance of a radio vortex (RV) communication system based on a partial angular aperture receiving (PAAR) sch

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38

Kashani, F. D., M. Reza Hedayati rad, M. Reza Mahzoun, and B. Ghafary. "Beam propagation analysis of a multi beam FSO system with partially flat-topped laser beams in turbulent atmosphere." Optik 123, no. 10 (2012): 879–86. http://dx.doi.org/10.1016/j.ijleo.2011.05.036.

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39

Ching Yu, Low, and Muhammad Ramlee Kamarudin. "5G Fixed Beam Switching on Microstrip Patch Antenna." International Journal of Electrical and Computer Engineering (IJECE) 7, no. 2 (2017): 975. http://dx.doi.org/10.11591/ijece.v7i2.pp975-980.

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<span lang="EN-US">5G technology is using millimeter-wave band to improve the wireless communication system. However, narrow transmitter and receiver beams have caused the beam coverage area to be limited. Due to propagation limitations of mm wave band, beam forming technology with multi-beam based communication system, has been focused to overcome the problem. In this letter, a fixed beam switching method is introduced. By changing the switches, four different configurations of patch array antennas are designed to investigate their performances in terms of radiation patterns, beam formi

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40

Невзоров, А. А., С. В. Перченко та Д. А. Станкевич. "Экспериментальное исследование самоорганизующегося акустического канала связи". Письма в журнал технической физики 47, № 6 (2021): 32. http://dx.doi.org/10.21883/pjtf.2021.06.50756.18642.

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This paper presents the results of an experimental study of the adaptive communication system with phase separation. Adaptation is carried out by methods of machine learning and consists in transmitters phases regulation. An acoustic waveguide with a tunable metasurface is used as a propagation medium. In the case of multi-beam propagation and the presence of significant inter-symbol interference the transmission rate of 1 kbit/s was achieved. The adaptation time of the investigated system to sudden changes in the channel parameters does not exceed 10 cycles of training, even in case of signif

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41

Wang, Xian, Jian Ping Tan, Ling Yun Quan, and Xiao Le Cheng. "Real-Time Monitoring Method for Five-Degrees-of-Freedom of the Extruder’s Moving Parts." Applied Mechanics and Materials 105-107 (September 2011): 630–34. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.630.

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On the basis of systematic study on the existing measurement methods of multi-degrees-of-freedom, A real-time monitoring method for five-degrees-of-freedom of the extruder’s moving parts was proposed based on laser beam measurement reference and machine vision. Simultaneously measuring multi-degrees-of-freedom is implemented by two-collimated laser beam and three-point measurement in this method, laser dispersion technology is used for several measuring points using the same basis simultaneously, the baseline errors are initial adjusted and real-time monitored, the method of machine vision is

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42

Her, Shiuh Chuan, and Wei-Bo Su. "The Strain Energy Release Rate of a Bi-Material Beam with Interfacial Crack." Key Engineering Materials 306-308 (March 2006): 369–74. http://dx.doi.org/10.4028/www.scientific.net/kem.306-308.369.

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Multi-layer structures are common in electronic package especially for the micro devices manufactured via the semi-conductor processes or MEMS processes. Interfacial crack due to the delamination significantly weakens the multi-layer structure. It is desired to understand the interfacial fracture properties of the electronic packaging materials. In this research, three specimens named Doubled Cantilever Beam (DCB), End-Notched Flexure (ENF), and Four-Point-Bending are proposed to investigate the fracture toughness associated with mode I, mode II and mixed mode. Basing on the Euler-Bernoulli be

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43

Morales-Valdez, Jesús, Luis Alvarez-Icaza, and Antonio Concha. "On-line adaptive observer for buildings based on wave propagation approach." Journal of Vibration and Control 24, no. 16 (2017): 3758–78. http://dx.doi.org/10.1177/1077546317711309.

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A novel on-line system identification method for shear beam building models, based on a wave propagation approach, is developed as an alternative solution to modal analysis methods for the health assessment of multi-story buildings. A discrete shear beam model is introduced that is used to design an adaptive observer, allowing for the estimation of displacements and velocities, as well as the unknown shear wave velocities and damping coefficients in real-time. The adaptive observer design is based only on acceleration measurements, does not need a coordinate transformation, and uses the normal

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Researcher. "DEVELOPMENT OF ADAPTIVE BEAMFORMING ALGORITHMS FOR HIGH-SPEED DATA TRANSMISSION IN MILLIMETER-WAVE WIRELESS COMMUNICATION SYSTEMS." INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATION ENGINEERING (IJECEG) 2, no. 1 (2025): 1–7. https://doi.org/10.5281/zenodo.14748575.

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Millimeter-wave (mmWave) wireless communication systems offer a promising solution for high-speed data transmission due to their wide bandwidth availability. However, the propagation characteristics of mmWave signals, including high path loss and susceptibility to obstacles, necessitate advanced beamforming techniques to ensure reliable communication. This paper explores the development of adaptive beamforming algorithms designed for dynamic environments to optimize data throughput and system performance. The study reviews existing methodologies, identifies challenges, and proposes innovative

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Kurayev, A. A., and V. V. Matveyenka. "Electrically Tunable Four-Mirror Gyrotron with Crossed Fields." Doklady BGUIR 21, no. 5 (2023): 68–72. http://dx.doi.org/10.35596/1729-7648-2023-21-5-68-72.

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In a four-mirror gyrotron, a wide multi-screw electron beam, being in crossed electric and longitudinal magnetic fields, drifts with a velocity vd = E0 /B0 in the direction of the T-wave propagation between the resonator mirrors (co-current wave) or in the opposite direction (counter-propagating wave). In this case, in accordance with the Doppler effect, the generation frequency ω is determined from the synchronism conditions as ω ≈ kωl(1±βd), βd = vd /с. Thus, a change in E0 changes ω, i. e. electrical frequency tuning is carried out. The article presents a diagram of the design of a two-beam

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Petukhov, Yu V., and E. L. Borodina. "The Influence of Bottom Sediment on the Propagation of Caustic Beams in Oceanic Waveguides." Акустический журнал 69, no. 5 (2023): 576–83. http://dx.doi.org/10.31857/s0320791923600567.

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Numerical modeling with the use of mode theory was used to investigate the regularities of the spatial (depth and horizontal distance) distribution of the acoustic field intensity formed by multiple interaction of a caustic beam with a layered bottom in a shallow oceanic waveguide with an underwater sound channel open to the bottom. It has been established that at the values of the sound velocity at the upper boundary in the sedimentary layer, less than the sound velocity at the bottom in the water layer, the formation of a multi-beam structure of the acoustic field is possible. It was found t

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Bechta, Kamil, Jan M. Kelner, Cezary Ziółkowski, and Leszek Nowosielski. "Inter-Beam Co-Channel Downlink and Uplink Interference for 5G New Radio in mm-Wave Bands." Sensors 21, no. 3 (2021): 793. http://dx.doi.org/10.3390/s21030793.

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This paper presents a methodology for assessing co-channel interference that arises in multi-beam transmitting and receiving antennas used in fifth-generation (5G) systems. This evaluation is essential for minimizing spectral resources, which allows for using the same frequency bands in angularly separated antenna beams of a 5G-based station (gNodeB). In the developed methodology, a multi-ellipsoidal propagation model (MPM) provides a mapping of the multipath propagation phenomenon and considers the directivity of antenna beams. To demonstrate the designation procedure of interference level we

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Zhang Rui, 张瑞, 刘欣格 Liu Xinge та 徐华锋 Xu Huafeng. "径向偏振扭曲矩形多高斯-谢尔模光束及其传输特性". Laser & Optoelectronics Progress 59, № 11 (2022): 1103001. http://dx.doi.org/10.3788/lop202259.1103001.

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Chu, Xiuxiang, Zejin Liu, and Yi Wu. "Propagation of a general multi-Gaussian beam in turbulent atmosphere in a slant path." Journal of the Optical Society of America A 25, no. 1 (2007): 74. http://dx.doi.org/10.1364/josaa.25.000074.

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Zheng, Chongwei. "Off-axis flat-topped multi-Gaussian beam and its propagation through paraxial optical system." Optik 118, no. 11 (2007): 552–56. http://dx.doi.org/10.1016/j.ijleo.2006.05.008.

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