A phenomenon that might cause a structure to collapse catastrophically is the propagation of cracks inside composite materials or at the interface of composite joints. Fail-safe design becomes essential when a structu...
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The process of bringing about a novel microstructure can be a good way of improving on the uses of magnesium and its alloys. This study examines the AZ80 Mg with an ultra-fine grain (UFG) that has an average grain siz...
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Accurate orientation estimation is important in various applications such as robotics, unmanned vehicles, and biomechanics, in which an attitude and heading reference system (AHRS) is essential. The AHRS provides orie...
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The Attitude and Heading Reference System (AHRS) plays a crucial role in various application fields, including unmanned vehicles, aerospace, and navigation. In an AHRS, 3D orientation, which encompasses both attitude ...
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The Attitude and Heading Reference System (AHRS) plays a crucial role in various application fields, including unmanned vehicles, aerospace, and navigation. In an AHRS, 3D orientation, which encompasses both attitude and heading, is determined by processing signals from an inertial/magnetic sensor, which consists of an accelerometer, a gyroscope, and a magnetometer. Specifically, the accelerometer is used to directly determine attitude, while the magnetometer is employed for heading. Consequently, the accuracy of attitude and heading measurements is influenced by the error factors associated with the accelerometer and magnetometer. In this study, we analyze the impact of error factors in inertial/magnetic sensors on the accuracy of attitude and heading under undisturbed conditions, such as static environments and uniform magnetic fields. We compare attitude and heading errors from two orientation estimation algorithms (TRIAD and QUEST) based on various sensor error factors, including noise, bias, nonorthogonality, and misalignment errors. Noise density and bias instability are assessed through Allan deviation analysis, while nonorthogonal and misalignment errors are selected according to the specifications of the commercial AHRS module (MTw, Xsens, Netherlands). Our results present the root mean square errors (RMSEs) of attitude and heading for each individual error factor, as well as for various combinations of error factors. We found that sensor noise with a constant noise density produces attitude and heading errors that converge to a specific RMSE, whereas nonorthogonality and misalignment lead to significant deviations in errors depending on the sensor orientation. In terms of bias, the effects of bias instability were found to be negligible for zero constant bias. However, as the constant bias of the accelerometer and magnetometer increased by 1 mg and 0.5 mGauss, respectively, the attitude and heading errors increased by approximately 0.03°–0.04° and 0.04°, r
Photoacoustic imaging,an acoustic imaging modality with potentially optical resolution in an optical turbid medium,has attracted great ***,the convergence of wavefront optimization and raster scanning in computational...
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Photoacoustic imaging,an acoustic imaging modality with potentially optical resolution in an optical turbid medium,has attracted great ***,the convergence of wavefront optimization and raster scanning in computational photoacoustic imaging leads to the challenge of fast mapping,especially for a spatial resolution approaching the acoustic deep-subwavelength *** a sparse sampling paradigm,compressive sensing has been applied in numerous fields to accelerate data acquisition without significant quality *** this work,we propose a dual-compressed approach for photoacoustic surface tomography that enables high-efficiency imaging with 3D spatial resolution unlimited by the acoustics in a turbid *** dual-compressed photoacoustic imaging with single-pixel detection,enabled by spatially optical modulation with synchronized temporally photoacoustic coding,allows decoding of the fine optical information from the modulated acoustic signal even when the variance of original photoacoustic signals is *** perform a proof-of-principle numerical demonstration of dual-compressed photoacoustic imaging, that resolves acoustic sub-acoustic-wavelength details with a significantly reduced number of measurements,revealing the potential for dynamic *** dual-compressed concept,which transforms unobtrusive spatial difference into spatio-temporal detectable information,can be generalized to other imaging modalities to re alize efficient,high-spatial-resolution imaging.
A magnetometer should be calibrated to correct errors such as offset, scale factor, misalignment soft iron distortion, and hard iron distortion so as to achieve accurate azimuth estimation. An outlier elimination meth...
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As global population rises,accompanied by escalating environmental pollution and climate change,numerous countries find themselves grappling with an acute scarcity of natural freshwater resources^([1]).Seawater desali...
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As global population rises,accompanied by escalating environmental pollution and climate change,numerous countries find themselves grappling with an acute scarcity of natural freshwater resources^([1]).Seawater desalination presents a compelling solution to this looming crisis,especially considering the oceans are Earth’s largest water reservoir^([2]).
This paper proposes a method for integrating YOLOv9 and BoT-SORT algorithms for multi-object tracking in a multi-camera environment. Particularly, it focuses on analyzing the impact of re-identification (Re-ID) techni...
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It has been reported that finger dexterity and cognitive function decline with aging and are related to each other. In our previous study, we developed a training device (iWakka) for adjustability for grasping force. ...
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Al–20 wt% Zn alloy was As-caste and centrifugal casted, the comparative study of mechanical, microstructure and tribological properties where found. Density of the Al–20 wt% Zn alloy has 2.80 ± 0.0684...
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