A micro-cavity fiber Fabry-Perot interferometer based on dual capillaries is proposed and demonstrated for gas pressure measurement. Such a device fabricated by fusion splicing of tiny segment main-capillary with feeding-capillary one end, single mode the other, to allow enters via feeding-capillary. The reflection spectrum shifts variation due dependence refractive index applied. During fabrication process, core-offset method adopted, which turns out be highly effective reducing detection...

A novel "turn-on" phosphorescent chemodosimeter based on a cyclometalated Ir(III) complex has been designed and synthesized, which displays high selectivity sensitivity toward Hg2+ in aqueous media with broad pH range of 4–10. Furthermore, by time-resolved photoluminescence techniques, some interferences from the short-lived background fluorescence can be eliminated effectively signal-to-noise ratio emission detection improved distinctly using chemodosimeter. Finally, used to monitor living...

An optical fiber Fabry-Pérot interferometer (FPI) based on an air cavity with a microchannel is proposed and demonstrated for gas pressure measurement. The inner fabricated by fusion splicing single-mode (SMF) microhole at the end facet to another section of SMF, then creating vertically cross allow flow in. As cascaded short three-beam interference pattern produced, which shifts variation in due refractive index change gas. In order compensate temperature effect, multiple-dip tracing...

Many tire-road friction coefficient estimation methods require the wheel angular speed sensor to provide a signal. In this paper, algorithm for distributed drive electric vehicles using permanent magnet synchronous motors(PMSM) sensorless control is proposed reduce use of sensors. The signal replaced by rotor obtained from PMSM control. First, three degrees freedom vehicle dynamics model and mathematical are established, strong tracking cubature Kalman filtering based on orthogonal...

Many diseases are closely related to abnormal concentrations of ascorbic acid (AA), dopamine (DA), and uric (UA). Therefore, the detection these small molecules is significant for monitoring life metabolism healthy states. Electrochemical has been widely used detect due its good selectivity, high sensitivity, economics. Fabrication application two sides coin, we cannot give up one other. Graphene (GN) a very suitable material electrochemical sensing excellent catalytic performance large...

To accurately obtain the state parameter information of a vehicle, square root generalized high-order cubature Kalman filter (CKF) estimation algorithm based on atomic search optimization (ASO-SRGHCKF) is proposed. On basis CKF, using rule instead cumbersome spherical rule, algorithm's weights and points are calculated directly. Then, filtering technology introduced, CKF (SRGHCKF) derived by replacing Cholesky decomposition with orthogonal triangle (QR) decomposition. lessen estimate error...

The recurrent neural network transducer (RNN-T) model has been proved effective for keyword spotting (KWS) recently. However, compared with cross-entropy (CE) or connectionist temporal classification (CTC) based models, the additional prediction in RNN-T increases size and computational cost. Besides, since training data usually only contain sequence, might over-fitting problems. In this paper, we improve modeling small-footprint three aspects. First, to address issue, explore multi-task...

Polyphonic sound event detection (polyphonic SED) is an interesting but challenging task due to the concurrence of multiple events. Recently, SED methods based on convolutional neural networks (CNN) and recurrent (RNN) have shown promising performance. Generally, CNN are designed for local feature extraction while RNN used model temporal dependency among these features. Despite their success, it still insufficient existing deep learning techniques separate individual from mixture, largely...

We propose and experimentally demonstrate a fully tunable microwave photonic narrow bandpass filter based on phase modulation to intensity (PM-IM) conversion. In the implementation, an on-chip dual-drive microring resonator (MRR) is key component. This leverages multimode waveguide enable high Q-factor. A metallic micro-heater lateral PN junction are simultaneously created for resonance wavelength tuning. When one driving signal applied micro-heater, large tuning range of resulted; when...

Abstract The advancement of autonomous driving heavily relies on the ability to accurate lane lines detection. As deep learning and computer vision technologies evolve, a variety learning-based methods for line detection have been proposed by researchers in field. However, owing simple appearance lack distinctive features, it is easy other objects with similar local appearances interfere process detecting lines. precision limited unpredictable quantity diversity To address aforementioned...

Marine shale samples from the Cretaceous (Albian‐Campanian) Napo Formation (n = 26) six wells in eastern Oriente Basin of Ecuador were analysed to evaluate their organic geochemical characteristics and petroleum generation potential. Geochemical analyses included measurements total carbon (TOC) content, Rock‐Eval pyrolysis, pyrolysis — gas chromatography (Py—GC), mass‐spectrometry (GC—MS), biomarker distributions kerogen analysis by optical microscopy. Hydrocarbon accumulations are...

As the support of daily-use ceramic products design by using digital development platform, nowadays advanced technology –– 3D print technique can directly and develop products. The software illustrates three-dimensional model convert it to appropriate number format, then this hi-tech make real full scale mock up. Use way present products, create a graphic database, eventually establish systematic research about design.

Fiber-optic temperature sensors have gained much attention owing to their intrinsic features of light weight, immunity electromagnetic interference, and capability for distributed measurement. Especially, based on Fabry-Perot interferometers (FPIs) are attractive advantages compact size convenient reflection However, due the low thermal expansion or/and thermo-optic coefficient fiber, sensitivities these normally (~10 pm/℃ or even lower). In order improve sensitivity, a device with dual...

To address the difficulties in accurately measuring driving state parameters and road adhesion coefficient, this paper, permanent magnet synchronous motor (PMSM) was selected as automotive in-wheel motor, distributed drive electric vehicle (DDEV) simulation model built based on CarSim MATLAB/Simulink software. PMSM speed estimation by Adaptive Sliding Mode Observer (ASMO) used input information for subsequent studies of coefficient estimation. Next, paper established a nonlinear...

Abstract Under the condition of small roof deformation before occurrence fractures and collapse in room pillar mined-out areas caused by coal instability, surface may be large, which threatens safety ground structures. Interferometric synthetic aperture radar, geophysical exploration, geotechnical exploration physical simulation tests were conducted to analyse development mechanism overlying strata area this case. The results show that terms deformation, instability exhibits slow stage,...

We propose and demonstrate a photonic approach to generating low-phase-noise ultra-wide arbitrary waveforms based on wideband injection-locked optoelectronic oscillator (OEO). A seed microwave signal from an external source is injected into the OEO loop. When period of equal round-trip time loop, injection locking works continuous-wave signal, which center frequency bandwidth are identical that generated by OEO. Thanks long fiber phase noise highly improved. To increase photonic-assisted...