Abstract Temperature‐adaptive variable emissivity reflectors offer an electricity‐free and environmentally friendly cooling strategy, holding substantial potential to improve the global energy landscape. However, challenges associated with unoptimized solar absorptance can lead overcooling or overheating when modulation of infrared emittance is held constant, thereby increasing extra consumption. Herein, a temperature‐adaptive reflector based on W‐Mg co‐doped VO 2 (W‐Mg‐VER) proposed,...

Counterfeit Chinese liquor incidents in China have significantly disrupted market order and jeopardized the health of consumers. Currently, deep learning-based spectral detection techniques are extensively leveraged non-invasive food inspection. Excessive reliance on labels severely limits its application real scenarios. To make better use limited samples, we first to "unsupervised pre-training & supervised fine-tuning" paradigm combining Transformer architecture for feature extraction...

Chlorophyll-a fluorescence detection is an important technique for monitoring water quality. In this paper, we proposed approach that employs the ratio of to Raman obtained from contact and non-contact laser-induced methods as key in water. At first, extracted solutions were prepared, each sample was tested using two methods. The true values samples measured laboratory spectrophotometry. Then, system calibrated through linear fitting fluorescence–Raman ratio. correlation coefficients 0.9453...

Chemical Oxygen Demand (COD) serves as a crucial metric for assessing the extent of water pollution attributable to organic substances. This study introduces an innovative approach detection low-concentration COD in aqueous environments through application Laser-Induced Fluorescence (LIF) image processing. The technique employs sensor capture fluorescence data generated by compounds when excited ultraviolet laser radiation. Subsequently, value, indicative concentration matter water, is...

The attention mechanism enables graph neural networks (GNNs) to learn the weights between target node and its one-hop neighbors, thereby improving performance further. However, most existing GNNs are oriented toward homogeneous graphs, in which each layer can only aggregate information of neighbors. Stacking multilayer introduces considerable noise easily leads over smoothing. We propose here a multihop heterogeneous neighborhood fusion representation learning method (MHNF). Specifically, we...

Chemical Oxygen Demand (COD) is widely utilized as a representative and required measurement indicator of water pollution well quality monitoring. The spectral technology an important development direction in detection. In this paper, novel COD monitoring instrument designed based on ultraviolet (UV) absorption photometry laser spectroscopy. consists CODcr CODmn detection modules. module the Lambert-Beer law to measure UV organic matter water, which can be used parameter high concentration...

Abstract Fluorescent carbon dots (CDs) are widely applied for the detection of heavy metal ions due to their nontoxicity, high sensitivity and stability. In this work, CDs were synthesized by a simple green pyrolysis method without complicated post‐processing procedures characterized transmission electron microscope, X‐ray diffraction, fourier transform infrared spectroscopy, UV‐visible spectrophotometer fluorescence spectroscopy. The exhibited relatively narrow size distribution 3.5‐8.6 nm...

Laser-induced fluorescence lidar (LIF-LiDAR) is an effective technology for the stand-off detection, identification, and quantification of oil spills on water surface. In this work, by using a self-developed LIF-LiDAR system, laser-induced spectra different oils with thicknesses surface were remotely measured at distance 100 m. The traditional algorithms based similarity degree matching are adopted to identify types, which results in 65% (min = 33.68%) 85% (max 98.66%) average accuracy when...

Abstract In the search for efficiently phosphorescent materials, this article presents a rational design and theoretical comparative study of some photophysical properties in (fpmb) x Ir(bptz) 3‐x ( = 1–2), which involve usage two 2‐pyridyl triazolate bptz ) chromophores strong‐field ligand fpmb 1‐(4‐difluorobenzyl)‐3‐methylbenzimidazolium). The first principle analysis under framework time‐dependent density functional theory approach is implemented to investigate electronic structures,...

In this paper, we proposed a novel method to determine the oil film thickness on water with wide range, which is based intensity ratio between laser-induced fluorescence and Raman scattering of without films. To verify feasibility method, presented portable detection system employs laser diode at 405 nm an intensified charged-coupled device (ICCD) detector. Using system, diesel films variable thicknesses were measured different distances. The was in range from 0.07 mm 36.62 average relative...

In this invited paper, a novel water chemical oxygen demand (COD) detection method based on laser spectroscopy is proposed, and the COD value obtained according to intensity ratio of Fluorescence-Raman signal produced by incident into water. Based (LFRR) method, we design portable quality measurement system. which, 405 nm semiconductor used as light source. The coupled delivering port Y-type fiber then transmitted generated Mie scattered light, Raman corresponding fluorescence are received...

One-step selective direct current (DC) plasma etching technology is employed to fabricate large-area well-aligned nanocone arrays on various functional materials including semiconductor, insulator and metal. The cones have nanoscale apexes (∼2 nm) with high aspect ratios, which were achieved by a process using only CH4 H2 in bias-assisted hot filament chemical vapor deposition (HFCVD) system without any masked process. ions play major role etch the roughened surface into conical structure...

In this paper, a new method of measuring water-stimulated Brillouin scattering (SBS) frequency shift by optical coherent detection is presented, in order to remote-sense the underwater temperature ocean. A single longitudinal mode, passively Q-switched pulsed Nd:YAG laser used as light source, water SBS beam signal beam, and portion incident local oscillator. The heterodyne detected high-speed photodetector, shift. Therefore, can be determined according relationship between temperature. To...

In this letter, we develope a control and image processing system for Streak Tube Imaging Lidar (STIL).In the system, data acquisition card software interface are programmed in Visual Basic (VB) while is finished by MATLAB.A STIL imaging experiment carried out laboratory.We obtained intensity range images of targets with pseudo color reconstruction set raw streak at different distances acquired STIL.The resolution better than 2 centimeters.

An optically pumped gas terahertz fiber laser based on gold-coated quartz hollow-core is demonstrated. When the filled with methanol and by a piezoelectric-ceramic-transducer-adjusted transversely excited atmospheric pressure carbon dioxide laser, continuous 2.52 THz output power of 110 mW obtained. Attributed to adjustment piezoelectric ceramic transducer in fluctuation controlled within ±5%. The result confirms possibility compact flexible laser.

Highly ordered TiO2 nanotube array (TNA) films were fabricated by anodic oxidation of Ti foil. Au nanoparticles (NPs) are decorated onto the top TNA with aid ion-sputtering and thermal annealing. The steady-state photoluminescence (PL) spectra, as well x-ray photoelectron spectroscopy (XPS) Raman analysis, confirm presence Ti3+ valence states in prepared films. UV–vis absorption spectra show that photo-response as-prepared samples is extended from UV to visible light region. From nanosecond...