Results 81 to 90 of about 7,499 (273)
An Adaptive Tracking Method for Moving Target in Fluctuating Reverberation Environment
Remote SensingIn environments with a low signal-to-reverberation ratio (SRR) characterized by fluctuations in clutter number and distribution, particle filter-based tracking methods may experience significant fluctuations in the posterior probability of existence ...
Ning Wang +4 more
doaj +1 more source
Optimal Waveform Design Using Frequency-Modulated Pulse Trains for Active Sonar
Sensors, 2019 Frequency-modulated pulse trains can be applied in active sonar systems to improve the performance of conventional transmitted waveforms. Recently, two pulse trains have been widely researched as the transmitted waveforms for active sonars.
Chengyu Guan, Zemin Zhou, Xinwu Zeng
doaj +1 more source
A forward speed effects study on jet noise from several suppressor nozzles in the NASA/Ames 40- by 80-foot wind tunnel [PDF]
A test program was conducted in a 40 by 80 foot wind tunnel to evaluate the effect of relative velocity on the jet noise signature of a conical ejector, auxiliary inlet ejector, 32 spokes and 104 tube nozzle with and without an acoustically treated ...
Beulke, M. R. +3 more
core +1 more source
, 2017 We present the characteristics and the performance of the new CCD camera system, SNUCAM-II (Seoul National University CAMera system II) that was installed on the Lee Sang Gak Telescope (LSGT) at the Siding Spring Observatory in 2016.
Choi, Changsu, Im, Myungshin
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A model interference method for shallow water reverberation suppression [PDF]
The Journal of the Acoustical Society of America, 1992 A method of boundary reverberation reduction for shallow water ducts has been devised that makes use of a vertical array of sound sources. By controlling the waveforms of the sources, control over the phase and amplitudes of a selected set of modes can be made. This in turn allows formation of nulls in the field at specified range/depth pairs.
openaire +2 more sources
Advanced Materials Interfaces, EarlyView.Titanium (Ti) and bismuth (Bi) are selected as alloying elements for the preparation of the Ti‐Bi binary alloy system. Biofilm formation is found to be inhibited by bismuth through the disruption of sulfur metabolism and redox homeostasis, as well as through the direct downregulation of biofilm‐associated proteins.
Lei Shi +10 more
wiley +1 more source
The Hydrodynamic Noise Suppression of a Scaled Submarine Model by Leading-Edge Serrations
Journal of Marine Science and Engineering, 2019 High hydrodynamic noise is a threat to the survival of underwater vehicles. We investigated a noise suppression mechanism by putting leading-edge serrations on the sail hull of a scaled SUBOFF model, through numerical calculation and an experimental test.
Yongwei Liu, Yalin Li, Dejiang Shang
doaj +1 more source
Advanced Optical Materials, EarlyView.This study presents printed image‐integrated smart windows that simultaneously control color and transmittance using electrochromic polymer‐dispersed liquid crystals (ECPDLCs). By optimizing the electrochromic LC composition and refining the drop‐on‐demand printing process, precise image integration and dynamic optical control are achieved.
Jun‐Seok Ma +13 more
wiley +1 more source
Smart Theremin Based on Electromagnetic Metasurfaces for Fine Dual‐Hand Perception
Advanced Optical Materials, EarlyView.The proposed Meta‐Theremin leverages a frequency‐spatial multiplexing metasurface to enable robust dual‐hand perception by shielding environmental noise and confining EM fields to interaction zones. Its physics‐informed neural network decouples hand‐specific echoes, enhancing accuracy.
Che Liu +8 more
wiley +1 more source
Оптимизация параметров алгоритма подавления поздней реверберации [PDF]
, 2014 Показано існування оптимальних, в сенсі таких критеріїв як точність розпізнавання мовлення та якість мовлення, значень границі між ранніми відлуннями та пізньою реверберацією.
Ladoshko, O. +5 more
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