Photoelectrochemical (PEC) reduction of carbon dioxide (CO2 ) is a potential method for production fuels and chemicals from C1 feedstock accumulated in the atmosphere. However, low solubility CO2 water, complicated processes associated with capture conversion, render conversion inefficient. A new concept proposed which PEC system used to convert into formic acid. The process assisted by an ionic liquid (1-aminopropyl-3-methylimidazolium bromide) aqueous solution, functions as absorbent...

The polarization states of a skylight can be used for navigation by lot insects as well human beings. However, the patterns are greatly influenced atmospheric conditions. This paper studied under different sky conditions polarized imaging measurements, in which AOT (Aerosol Optical Thickness) and clouds were taken into account. results showed that both aerosol cloud disturbed skylight, but AOP (Angle Polarization) great robustness. symmetry images was found to quite steady most We proposed...

Interferometric distributed optical fiber sensing technology has emerged as an important branch in the field of sensors, and research on is great significance. In this article, a vibration localization algorithm based phase spectrum time delay estimation proposed. The effectively overcomes limitations stationary periodic signals multiple localization. Theoretical analysis presented to clarify principle localization, especially for vibrations experimental verification signal 40-km...

A line-based fiber optic sensor employing time delay estimation to locate time-varying disturbance is proposed. The consists of two interferometers, multiplexed with a broadband light source, interfering unit and sensing by wavelength division multiplexer, hence detected signals different wavelengths generated the same are obtained. After unique data processing algorithm, fixed achieved determined position disturbance. By signal correlation method extract delay, can be measured. performance...

Abstract Ti/IrO 2 –Ta O 5 coated anodes were widely used in the production process of aluminum foil that is vital raw material for high-performance electronic components, exhibits excellent service durability sulfuric acid medium, but its lifespan significantly reduced when ammonium citrate neutral electrolyte. The evolution constant current accelerated lifetime 100 g/L aqueous solution was systematically studied. corrosion mechanism revealed by physical characterization and electrochemical...

An improved classification algorithm that considers multiscale wavelet packet Shannon entropy is proposed. Decomposition coefficients at all levels are obtained to build the initial feature vector. After subtracting map of background signal, components strongest discriminating power in vector picked out rebuild vector, which transferred radial basis function (RBF) neural network for classification. Four types man-made vibrational intrusion signals recorded based on a modified Sagnac...

Silicon (Si) nanomembranes (NMs) enable conformal covering on complicated surfaces for novel applications. We adopt classical fibers as flexible/curved substrates and wrap them with freestanding ultrathin Si-NMs a thickness of ∼20 nm. Intrinsic defects in single-crystalline provide flow path hydrofluoric acid (HF) to release the NM consecutive area ∼0.25 cm2. Such ultralow flexural rigidities are transferred onto single-mode fiber (SMF) functionalized into bendable photodetectors, which...

A novel distributed fiber-optic sensor is proposed and demonstrated, in which two Mach-Zehnder interferometers are used to detect the interference signals with different wavelengths, one 3 × coupler deployed demodulate time-varying phase change caused by vibration. The dual interferometer (DMZI) composed of wavelength division multiplexers. Then, a time delay estimation algorithm designed construct related using difference, constructed obtain vibration position through cross-correlation....

A novel distributed fiber-optic localization algorithm with high sensitivity and precision based on merged Michelson-Sagnac interferometer is proposed demonstrated. By performing simple addition subtraction processing the two phase differences of interferometers, superimposed signals a fixed delay can be obtained. The time calculated by cross-correlation algorithm. Combined polynomial fitting interpolation, disturbance location resolution significantly improved. total sensing distance reach...

To solve the problem of light source jitter and asymmetric 3 × coupler, a phase demodulation method with combination an auxiliary reference interferometer elliptic fitting algorithm is proposed, which verified by simulation experiment. By introducing additional modulation in interferometer, parameters sensing arm can be calibrated real time, ensures effective operation small signal measurement. Consequently, experiments show that self-calibration scheme enables higher to noise distortion...

We designed a distributed fiber optic sensor based on hybrid Michelson-Sagnac interferometer to overcome the defect that conventional structure cannot locate when disturbance position is close midpoint of Sagnac ring. The has excellent and flat frequency response for no-blind zone location. With demodulation algorithm 3 × optical coupler simple mathematical operations, we can get two phase signals with time difference location pattern recognition. were converted two-dimensional images by...

In industrial production, accidents caused by the unsafe behavior of operators often bring serious economic losses. Therefore, how to use artificial intelligence technology monitor in a production area real time has become research topic great concern. Based on YOLOv5 framework, this paper proposes an improved YOLO network detect behaviors such as not wearing safety helmets and smoking places. First, proposed uses novel adaptive self-attention embedding (ASAE) model improve backbone reduce...

Abstract Photoelectrochemical (PEC) reduction of carbon dioxide (CO 2 ) is a potential method for production fuels and chemicals from C1 feedstock accumulated in the atmosphere. However, low solubility CO water, complicated processes associated with capture conversion, render conversion inefficient. A new concept proposed which PEC system used to convert into formic acid. The process assisted by an ionic liquid (1‐aminopropyl‐3‐methylimidazolium bromide) aqueous solution, functions as...

Workload assessment faces two major issues. That is, how to learn effective fatigue characteristics and find the potential state of workload. This paper proposes a solution assess brain workload pilots through an instantaneous spectral entropy feature infinitely warped model. The electroencephalography (EEG) signals are extracted by Hilbert transform, Euclidean norm weighted permutation is proposed. model new automatic learning for detecting arbitrary shapes EEG data. In addition, we propose...

Taking ship vibration isolation systems as the research subject, particle damper was applied to study its reduction performance. The energy dissipation mechanism of dampers is analyzed, and an calculation model derived. combined method simulation experimentation employed influence parameters such material, filling rate, diameter, collision coefficient restitution on performance dampers. impact laws these are summarized, demonstrating that can produce excellent when in systems, reasonable...

Aviation accidents, referring to unexpected and undesirable events involving aircraft, often cause great damage property human life. Learning from historical accidents is pivotal for improving safety in aviation. However, aviation are typically documented stored as unstructured or semi-structured free-text, rendering the ability analyze such data a difficult task. This study presents novel framework that combines text mining network analytics techniques provide accident reports...

Pathological images are important for diagnosis and prognosis of oral squamous cell carcinoma (OSCC). However, it is difficult pathologists to directly apply intuitive pathological image information predict prognosis. Applying supervised learning (SL) whole slide (WSIs) analysis labor-consuming time-costing, semi-supervised (SmSL) has provided a new opportunity revisit classical approaches in digital pathology. In this study, we designed an intelligent SmSL system based on Self-supervised...

Problems associated with the demodulation and localization of acoustic signal produced by fiber optic interferometer are investigated. It is shown that existing method utilizing 3 × coupler do not work well for cannot reach full amplitude sensor to compensate dc normalize amplitude. Modifications improve performance previously proposed suggested. After demodulation, two phase difference signals received have fixed time delay based on a unique data processing method, hence, position...