A pyrene-based probe has been applied for the fluorescent detection of picric acid in aqueous media and on test strips.

Due to the vulnerability of power transformer windings overcurrent impact during operation, significant electromagnetic forces are generated, posing potential hazards failure. Therefore, it is crucial conduct an analysis under conditions. In this study, a three-phase model established, with specific attention given refinement winding modeling. Utilizing Maxwell software, simulation and leakage field windings, axial distribution forces, their transient processes over time performed...

A Bayesian marked point process (MPP) model is developed to detect and count people in crowded scenes. The couples a spatial stochastic governing number placement of individuals with conditional mark for selecting body shape. We automatically learn the (shape) from training video by estimating mixture Bernoulli shape prototypes along an extrinsic distribution describing orientation scaling these shapes any given image location. reversible jump Markov Chain Monte Carlo framework used...

When an electromagnetic transient occurs in a transformer, certain parts of the winding will be over stressed internally, which severe cases lead to destruction insulation. Excitation inrush current and short-circuit are main causes damage during transients, resulting or accelerating damage, presence excitation can greatly reduce service life power transformers. The process closing energizing transformer generates large inrush, when amplitude is same, greater force than current. In this...

We consider multi-target tracking via probabilistic data association among tracklets (trajectory fragments), a mid-level representation that provides good spatio-temporal context for efficient tracking. Model parameter estimation and the search best are unified naturally within Markov Chain Monte Carlo sampling procedure. The proposed approach is able to infer optimal model parameters different scenarios in an unsupervised manner.

When a transformer is de-energized, the magnetic core material will contain certain amount of residual flux. This flux may intensify saturation and lead to high transient in-rush current upon remagnetizing. paper describes novel method for analyzing detecting flux, based on nonlinear magnetizing characteristics (also called Φ- I characteristics) core. A model toroidal was built simulate transients, which takes process initial energization nonloaded into consideration. The relationship...

Abstract As meter data becomes more and important in the power industry, detection robots are led into substations for automatic collection of pointer meters. However, images captured low illumination environments unclear, resulting poor recognition reading. A low-illumination image enhancement method based on virtual exposure is proposed this paper, improving dark bright areas images, respectively. Then fusion was performed Laplace pyramid to obtain clear images. In addition, dial area...

A sensor based on polyelectrolyte-induced pyrene excimers has been developed for the visual detection of heparin with high sensitivity and selectivity.

We have developed a unique approach for enhancing the sensitivity of pyrenyl probes based on polyelectrolyte-induced nanoassemblies and explored its sensing application toward 2,4,6-trinitrophenol (TNP). The key issue method is formation which possess high-density charges, specific surface area, inner hydrophobic regions. These properties would help increase loading analytes promote probe-analyte interactions, thereby leading to prominent enhancement sensitivity. In course TNP detection,...

A new fluxgate current sensor is presented in this paper. The consists of an additional magnetic toroidal core and winding, aside from the elements a traditional sensor. In addition, exciting winding wound along circumference to decouple field feedback order reduce internal interference. With proposed can extend its bandwidth medium- high-frequency ac measurement. Another purpose introducing concentrate on interference external disturbances. prototype was designed tested. Test results show...

The power transformer is the major electrical equipment in system and should be able to resist damage that caused by abnormal conditions, like influence of inrush current electromagnetic force. However, residual flux, which most common factor inrush, can result large magnitude. This paper analyse force as for impact safe operation transformer. research under various factors has practical significance. In order study electromechanical forces influenced was analysed Jiles-Atherton (J-A)...

Magnesium hydroxide is commonly used as a coagulant for treating reactive dyes wastewater. However, the flocs are relatively small and coagulation process needs longer sedimentation time. Large short operation time important good performance. Coagulation floc formation growth processes using magnesium polyacrylamide (PAM) dual-coagulant were investigated with controlled experiments through flocculation index (FI), size distribution, zeta potential, scanning electron microscopy Fourier...

The explicit prediction of PV power itself is great significance to the scheduling and operation grid. To ensure stable system, this paper proposes a coupled model for based on TSO-LSTM-XGBoost. This considers weather factor using tuna swarm algorithm(TSO) optimize long short-term memory network model(LSTM) overcome shortcomings blindness time-consuming in process randomly selecting parameters LSTM model. At same time, extreme gradient boosting (XGBoost), algorithm improved corrected large...

In this paper, Au nanoshell arrays, serving as a photo-activated material, are fabricated via the combination of self-assembled nanosphere lithography and thermal decomposing polymer method. The intensity position surface plasmonic resonance can be tuned from visible region to near-infrared by changing size arrays. When absorption peaks metal nanoparticles matched with emission wavelengths core-shell CdSe/CdS quantum dots, fluorescent dots strongly enhanced. physical mechanism enhancement is...

Electromagnetic interference has always been an important assessment indicator for the inspection of power intelligent Unmanned Aerial Vehicles (UAVs). Therefore, it is necessary to carry out a structure optimization study improve UAV's anti-electromagnetic capability. This paper analyses flight stability UAV at different heights under strong magnetic environment dry-type transformer, and carries structural optimisation rotary-wing design against standard non-magnetic environment. After...

Abstract Magnesium hydroxide was used as a coagulant for treating reactive orange wastewater in real continuous process. Effects of kaolin on coagulation performance and floc properties were investigated with controlled experiments through size distribution, zeta potential, scanning electron microscopy Fourier transform infrared spectroscopy. Kaolin had significant influence magnesium hydroxide-reactive formation growth. The results showed that average reached 16.31, 12.88 20.50 μm,...

When the electromagnetic transients occur in a power transformer, an inrush current is generated its winding. The not only affects performance of transformer windings, but also lifetime transformer. Many factors affect current, most influential ones among which are closing phase angle and residual flux. In this paper, dry-type simulation model built to analyze influence on windings during no-load reclosing conditions. Firstly, was operation under different fluxes. Secondly, field-circuit...