Heat input is one of the most important process parameters during additive manufacturing (AM). It great significance to understand effect heat on microstructure and nanomechanical properties, as well underlying mechanisms. Wire-arc manufactured (WAAM-ed) Al 4047 alloys under different inputs were produced studied in this work. The as-manufactured showed hypoeutectic that consisted primary (α-Al) dendrite ultrafine Al–Si eutectic. hardness strain rate sensitivity (SRS) investigated through...

The identification of tomato leaf diseases is easily affected by complex backgrounds, small differences between different diseases, and large the same diseases. Therefore, we propose a novel classification network for disease, Dense Inception MobileNet-V2 parallel convolutional block attention module (DIMPCNET). To begin, collected total 1256 original images 5 expanded them to 8190 using data enhancement techniques. Next, an improved bilateral filtering threshold function (IBFTF) algorithm...

Aiming at the shortcomings of traditional contact cable force monitoring technology in accuracy, efficiency, and applicability, an assessment method based on microwave radar measurements is proposed to measure a sloping with damper for lengths greater than 200 m this study. A formula calculating cable-stayed derived, intelligent platform developed cloud technology. Based Chongqing Nanjimen Railway Bridge, real bridge test was carried out. It indicated that could be used freely adjust...

Abstract This work addresses and compares the application of advanced signal processing methodologies for analysis large number acoustic emission (AE) data as obtained from quasi-static tension tests Carbon fiber reinforced plastic (CFRP) composites; event primary frequency technique time-frequency analysis-based AE analysis. Primary goal present study is to investigate effectiveness typical based such Short-time Fourier transform, Wavelet transform Hilbert-Huang in a simulation damage...

Implantable brain-computer interfaces (BCIs) have potentially important clinical applications due to the high spatial resolution and signal-to-noise ratio of electrodes that are closer or implanted in cerebral cortex. However, surgery implantable BCIs carry safety risks brain tissue damage, their medical face ethical challenges, with little literature date systematically considering norms for BCIs. In order promote translation this type BCI, we considered ethics practice application BCIs,...

Carbon/epoxy specimens were made and stretched to fracture. In the process, acoustic emission (AE) signals collected their parameters set as input of neural network. Results show that using support vector machine (SVM) network can recognize difference AE sources more accurately than BP addition, accuracy SVM increases when number training increases. It is proved signal sources' pattern well.

Poly(N-isopropylacrylamide) (PNIPAM) microgels with a unique thermosensitive swelling and deswelling behavior in water may be capable of sensing the frictional heat sliding interfaces altering performance water-lubricated contacts accordingly. However, rheological properties PNIPAM formation mechanism tribofilms at interface during friction are currently unclear. In present study, variation behaviors kinetic characteristics phase transformation was investigated using temperature-controlled...

We introduced the basic principle of Variational Mode Decomposition (VMD). The reliability and feasibility VMD in frequency analysis decomposition sluice vibration signals are studied by means a simulation signal consisting quadratic trend term, chirped segmented cosine. Through application to actual work detection, it is confirmed that method can eliminate noise vibration, better reflect real state water flow. decomposed reconstructed Qiaogong acceleration VMD, get root mean square value...

<title>Abstract</title> The performance of non-invasive Handwriting Imagery (HWI) input in Brain-computer interface (BCI) systems is highly dependent on the paradigms employed, yet there limited research interpretable scales to measure how HWI-BCI and neural encoding designs affect performance. This study introduces "Temporal Variation Abundance" metric utilizes it design two classes handwriting imagery paradigms: Low Temporal Abundance (LTVA) High (HTVA). A dynamic time warping algorithm...

The airflow structure of enclosures directly affects the spread COVID-19 and is also closely related to indoor air quality, thermal comfort personnel, buildings’ energy consumption. A large number studies on field under mixing displacement ventilation with a single inlet in rectangular rooms have been conducted; however, best authors’ knowledge, only limited dealt structures multi-slot enclosure opposed jets. Therefore, this paper uses PIV study velocity, turbulence information, entropy an...

The AE signals of fiber reinforced composites in the tensile testing were processed by Hilbert-Huang transform. well recognized from spectrum. experimental results show that frequency range matrix crack is below 200 kHz and main nearly 175 kHz. breakage above 250 While delaminations distributed all over energy also indicted intrinsic mode function (IMF) components empirical decomposition (EMD) can reconstruct original well, Hilbert spectrum IMF reveal trends signals.

In this paper, we use acoustic emission (AE) system to collect the AE signals and analyze damage evolution during monotonic compression test. Based on experimental correlation diagram of load characters emission, reference failure was found. The results also revealed source after wavelet packet decomposition frequency spectrum analysis. range matrix cracking is 125~187.5 kHz, while layer debonding wide, it not just low-frequency but high-frequency range. fiber breakage high range, nearly...

The maximum test load of Changlongshan pumped storage power station steel bifurcation pipe is 10MPa. To ensure the safety water pressure test, acoustic emission used to monitor main welds crescent rib and cone. Taking NO.3 pipe’s data as an example, source location system was find possible position harmful defects, through activity intensity sources confirm defect significance. After analysis, integrated level in II, comply with design requirements.

The Global Positioning System (GPS) is the most popular satellite positioning system in world at present. From development of GPS and current traffic condition monitoring methods, paper presents a new detection method based on technology. It can derive conveniently driving time, demand velocity vehicles driveway occupancy, obtain distribution function by means fitting values short time periods, mean quadrature. volume calculated an interval velocity, realizing real-time condition. This has...

Abstract We use standard vibration source to verify the method that displacement was obtained by filter and integral in frequency domain. The feasibility reliability of this confirmed. A gate’s response such as acceleration, dynamic stress tested. acceleration is less than 3 m/s2, 0.25 mm, 153.2 MPa. In initial stage gate lifting, maximum over requirements. Vibration evaluation given stress.