A5100456091- Advanced Fiber Laser Technologies
- Photonic Crystal and Fiber Optics
- Semiconductor Quantum Structures and Devices
- Orbital Angular Momentum in Optics
- Land Use and Ecosystem Services
- Semiconductor Lasers and Optical Devices
- Photonic and Optical Devices
- Urban Green Space and Health
- Conservation, Biodiversity, and Resource Management
- Laser-Matter Interactions and Applications
- Advanced Fiber Optic Sensors
- Economic and Environmental Valuation
- solar cell performance optimization
- Structural Load-Bearing Analysis
- Advanced Neuroimaging Techniques and Applications
- Urban Heat Island Mitigation
- Chalcogenide Semiconductor Thin Films
- Combustion and flame dynamics
- Human Pose and Action Recognition
- Adaptive optics and wavefront sensing
- Solid State Laser Technologies
- Optical Wireless Communication Technologies
- Advanced Combustion Engine Technologies
- Generative Adversarial Networks and Image Synthesis
- Visual Attention and Saliency Detection
Guizhou University
2025
Nankai University
2024
Sichuan University
2020-2024
China Southern Power Grid (China)
2024
Southern Medical University
2024
Jiangsu University
2022-2024
Nanjing Normal University
2023
Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application
2023
Northwest University
2020-2022
Chengdu University of Information Technology
2022
A rewritable and environmentally friendly paper using water as the ink is fabricated, various colors can be achieved.
Abstract High electro-optical conversion efficiency is one of the most distinctive features semiconductor lasers as compared to other types lasers. Its further increase remains a significant objective. Further enhancing edge-emitting (EEL), which represent highest among at present, challenging. The vertical cavity surface emitting (VCSELs) has always been relatively low EEL. This paper, combining modeling with experiments, demonstrates potential multi-junction cascaded VCSELs achieve high...
The trade-offs of ecosystem services (ES) are at the frontier geographical and ecological studies. However, previous studies have focused on either supply-supply trade-off or supply–demand trade-off, while integrated research three types for ES (i.e. demand-demand trade-off) needs to be further studied. This study establish an analytical framework. framework was then applied a sub-watershed Yellow River in China (i.e., Fenghe watershed). Based quantitative assessment both supply demand ES,...
Mastering the coupling and coordination relationship driving mechanism of urbanization ecosystem service value (ESV) is great significance to ecological protection regional sustainable development. In this paper, model, geographic detector GWR model are used analyze spatio-temporal interaction between ESV spatial differentiation characteristics influencing factors from 1995 2018. The results study as follows: (1) During period, cities in Yellow River Basin experienced accelerated urban...
Using the Google Earth Engine (GEE) platform, Moderate-resolution image spectroradiometer (MODIS) data of Weihe River Basin from 2001 to 2021 were acquired, four ecological indicators, namely, greenness, wetness, heat, and dryness, extracted, remote sensing index (RSEI) was constructed through principal component analysis. In addition, geographic detectors a multi-scale weighted regression model (MGWR) used identify main driving factors RSEI changes capture differences in spatial different...
The escalating incidence of human-wildlife conflicts involving protected species has posed a significant challenge in global conservation. Although population growth, byproduct successful conservation, often been pinpointed as key factor, the impact human-induced land use changes and habitat loss on conflict occurrence not well comprehended, especially at broader regional levels. In China’s mountainous southwest, between humans nationally rhesus macaque ( Macaca mulatta ) have intensified...
Six-junction GaAs laser power converts (LPCs) were designed and fabricated. Each subcell is vertically connected by p++-AlGaAs: C/n++-AlGaAs: Si: Te (1:2) tunnel junction with good thermal stability a record peak tunneling current density of 1867 A/cm2. The I-V characteristics LPCs an aperture 10×10 mm2 investigated as function temperature. Maximum conversion efficiency output 57.7% 15.4 W, respectively, continuous stable operation at 22.9 W for over 550 hours demonstrated. temperature...
The supply–demand risk assessment of ecosystem services (ES) can identify the level, which is very important for sustainable management regional ES. In this study, taking Fenghe River watershed (FRW) as a case, based on status and change trend ratio ES, ES supply trend, level food provision (FP), water yield (WY), soil retention (SR), climate regulation (CR) are evaluated, zones FRW divided using spatial superposition. results show that: (1) demand SR spatially matched, while other three...
InGaAs metamorphic laser power converters (LPCs) have the potential to deliver electrical energy over distances of several kilometers. In this study, metalorganic chemical vapor deposition (MOCVD) was used grow InGaAs-based LPCs with an absorption wavelength 1064 nm. At step thicknesses 2800 nm, overshoot 6000 reverse component and 2.4% 700 respectively, a surface roughness 6.0 nm (24%) lattice relaxation 93.7% buffer were obtained. The I-V characteristics 10 × mm2 apertures investigated as...
Improving the output power and efficiency of broad-area diode lasers is a prerequisite for further development fiber lasers, solid-state laser industries, direct semiconductor applications. At present, large amount Joule heat generated by drive currents limited wall-plug presents largest challenge improving these lasers. In this paper, multi-junction cascade with low generation demonstrated, showing conversion efficiency. We fabricated devices different junction numbers compared their power....
High power density VCSELs are attracting attentions in the field of LiDAR applications. Multi-junction VCSEL is key technology to obtain high density. slope efficiency, filling factor and small divergence angle straight-forward research directions realize this performance multi-junction array. We optimize epitaxial design fabrication process, such as tunnel junction, oxidation layer array layout. The progress on emitting around 940 nm reported. Selectively oxidized, top-emitting emitter with...
Abstract Studies on growth pattern of Tibetan infants and the difference from other child groups were limited due to its special living environment unique customs. In this study, 253 followed-up their birth 12 th month in rural Tibet. Five visits conducted weight length measured at each visit. Mixed model was employed analyze comparison Han infants. Propensity Scores (PS) technique adopted control for potential confounding factors. The mixed found that weight/length had a negative impact...
Passively mode-locked fiber lasers based on a nonlinear polarization rotation (NPR) have attracted much attention due to their ability generate short pulses with wide spectra and high peak power. However, environmental perturbations can easily cause the lose state make it challenge for practical application. The aim of this research is improve laser stability by inserting Lyot filter into cavity. experimental results indicate that be maintained when radius loop changed from 7.5 1.5 cm, while...
Compared to 9xxnm laser diodes emitting at 808nm are more prone catastrophic optical mirror damage (COMD) and thermal rollover due the shorter wavelength, resulting in lower device power. In this letter, we optimize a structure based on InGaAsP/InGaP improve conversion efficiency use facet passivation COMD level. Laser with <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$100~\mu \text{m}$...
In this study, a subnanometer heterodyne interference signal processing algorithm with dynamic filter is proposed. The can effectively reduce the measurement error caused by noise introduced in optical path and circuit. Because of low signal-to-noise ratio signal, variable coefficients designed. role bi-quadrature lock-in amplifier problem different amplitudes among reference uncertainty frequency difference dual-frequency laser analyzed. With aid interferometry platform, solution results...