The mechanism of elemental mercury (Hg0) re-emission from vegetation to the atmosphere is currently poorly understood. In this study, we investigated branch-level Hg0 atmosphere-foliage exchange in a pristine evergreen forest by systematically combining Hg isotopic composition, air concentration and flux measurements unravel process information. It found that foliage represents diurnally changing sink for atmospheric its content increases with leaf age mass. Atmospheric dominant source...

In this study, isotopic compositions of atmospheric total gaseous mercury (TGM) were measured in the Mt. Changbai (MCB) temperate deciduous forest and Ailao (MAL) subtropical evergreen over a 1-year period. Higher δ202HgTGM values observed under canopy than above MCB forest. The vertical gradients Δ199HgTGM are positively correlated with satellite-based normalized difference vegetation index (NDVI, representing photosynthetic activity), suggesting that strong activity (high NDVI) induces...

β-Ga2O3 epitaxial thin films were deposited by laser molecular beam epitaxy (LMBE) and annealed at 800°C for 30 minutes in air oxygen atmospheres, respectively. Photodetectors fabricated using as-grown Ga2O3 epilayers. The influence of the annealing atmosphere on crystal structure optical properties was investigated. X-ray diffraction (XRD) measurements show that in-plane compressive strain could be relaxed after high temperature thermal annealing. Compared with sample, samples exhibit a red...

BackgroundThe current prevalence of tuberculosis (TB) in the People's Republic China (P. R. China) demonstrates geographical heterogeneities, which show that TB remote areas Western is more serious than coastal plain Eastern China. Although a lot ecological studies have been applied exploration on regional difference disease risks, there still paucity P. China.ObjectiveTo understand underlying factors contributing to inequity burden by using an approach and, thus, aiming provide basis...

An impervious surface is considered one of main factors affecting urban waterlogging. Previous studies found that spatial pattern (composition and configuration) surfaces affected However, their relative importance remains unknown, the scale-effect on waterlogging has been ignored. To move forward, our research studied relationship between patterns its subcategories (building pavement) risk spots using Pearson correlation, partial redundancy analysis performed at three grid scales (1 km × 1...

Buildings are fundamental elements of human environments, and detecting changes in them is crucial for land cover studies, urban expansion monitoring, the detection illegal construction activities. Existing methods primarily focus on pixel-level differences bi-temporal remote sensing imagery. However, pseudo-changes, such as variations non-building areas caused by illumination, seasonal changes, other factors, pose significant challenges reliable building change detection. To address these...

Purpose When the bearing operates under static load, lubrication state of can be well distinguished by absolute value thermoelectric potential. However, when dynamic loads, potential is in an alternating state, fluctuating within a high range, making it difficult to straightforwardly characterize through The purpose this paper find relationship between and load. Design/methodology/approach A simulation executed using COMSOL Multiphysics calculate potential, oil film thickness, pressure...

Abstract To evaluate the impact of regional mercury (Hg) emissions and understand possible source regions atmospheric Hg in Eastern China, 2 year observation for speciated was conducted at Dameishan Atmospheric Observatory, a mountain site near east coast China. The observed concentration total gaseous (TGM) 3.3 ± 1.4 ng m −3 . During sampling period, oxidized particulate bound were 6.7 4.3 pg 180 110 winter 5.9 3.4 130 100 spring, respectively. relatively high mean TGM mainly caused by...

Water security, as a crucial component of national plays significant role in maintaining regional stability and ensuring the healthy rapid development economy society. The Yellow River water-receiving area Henan Province (YRWAR-HN) is selected research this study. Firstly, comprehensive evaluation index system constructed based on actual water security problems area, single quantification–multiple indices syntheses–poly-criteria integration method (SMI-P) introduced to quantify degree 14...

Atmosphere–surface exchange of elemental mercury (Hg(0)) is a vital component in global Hg cycling; however, isotope fractionation remains largely unknown. Here, we report during air–surface from terrestrial surfaces at sites background (two) and urban character five contaminated by mining. Atmospheric Hg(0) deposition to soils followed kinetic with mass-dependent (MDF) enrichment factor −4.32‰, negligible mass-independent (MIF). Net emission generated average MDF factors (ε202Hg) −0.91,...

The emergency response is crucial in preventing and mitigating urban floods. Both remote sensing social media data offer distinct advantages large-scale flood monitoring near-real-time monitoring. However, current research lacks a thorough exploration of the application imagery response. To address this issue, paper, while extracting disaster information based on data, deeply mines spatiotemporal distribution characteristics dynamic spatial accessibility rescue points. Furthermore, SAR for...

Abstract There is still a lack of effective lubrication condition monitoring methods in the field diesel engines. The paper proposes novel thermoelectric approach to divide state bearings. First, generation mechanism potential on bearings clarified. Then, both experimental and simulation studies are done, strong correlation between shown. film thickness temperature further confirmed as significant factors influencing potential. Generally, increases with temperature. However, small ratio...

Building footprint extraction from remotely sensed imagery is a critical task in the field of illegal building discovery, urban dynamic monitoring, and disaster emergency response. Recent research has made significant progress this area by utilizing deep learning techniques. However, it remains difficult to efficiently balance spatial detail rich semantic features. In particular, extracted edge often inaccurate, especially areas where buildings are densely distributed, boundary adjacent...

Purpose Aims to demonstrate how an automated robot program generation method can be developed and implemented. Design/methodology/approach A visual force servoing automatically generate paths programs, based on position, vision sensor fusion, was developed. Findings By using a hybrid control algorithm the is controlled follow feature surface with position orientation control. Originality/value The applied tool for many manufacturing tasks automatically, which greatly reduce programming time...

Bi2Sr2Co2Oy thin films were grown on 10° vicinal-cut Al2O3 (0001) single crystalline substrates by pulsed laser-deposition techniques with in situ annealing, post-annealing and non-annealing process, respectively. The pure phase film was obtained a process. result of X-ray diffraction showed that obviously c-axis preferred orientation. laser-induced thermoelectric voltage signals detected films, which originated from the anisotropy Seebeck coefficient. maximum peak value strong could reach...

In this letter, we discuss the increase in average cluster size by lowering stagnation temperature of methane (CH4) gas. The Coulomb explosion experiments are conducted to estimate and distribution. CH4 sizes Nav 6 230 580 acquired with source conditions 30 bars at 240 K 60 296 K, respectively. Empirical estimation suggests a five-fold clusters compared that room under backing pressure bars. A strong nonlinear Hagena parameter relation (\Gamma *\propto T^{-3.3}) for is revealed. results may...

In order to do the complex contact task, robot manipulator must have force control ability. this paper, we propose a new method compliant motion of manipulator: position/force with self-adjusting select-matrix. This not only uses information in feedback loop, but also it select matrix, let controller automatic switch between mode and position mode. Thus, has advantage accurate hybrid results, as well impedance for using explicit Experimental results verify theory confirm effectiveness method.

The robot position estimation is very important to the consistency of simultaneous localization and mapping (SLAM) problem. This paper presents an analysis convergence properties in linear-Guassian SLAM (LG-SLAM) problem based on some positive semi-definite matrixes. It found that as a whole, error increasing with time, although it has upper limit when can see all landmarks time. So hard predict estimation, there no any prior knowledge about environment. also finds determined by number seen...

High mobility spin-polarized two-dimensional electron gas (2DEG) is crucially important for spintronic applications. Here, we report our investigations on the 2DEG fabricated by spin coating a LaAlO3 layer (001) SrTiO3 substrate with La2/3Sr1/3MnO3 buffer layer. When below 3 uc, 2DGE highly mobile. Corresponding to thicknesses of 0, 1, and 2 Hall mobilities are ∼24 000 cm2/V s, ∼28 ∼59 600 s at K. In contrast, uc shows relatively low (∼3000 s). However, an anomalous effect was observed in...

Membrane gas absorption technology has been considered a promising approach to mitigate CO2 emissions from power plants. The aim of this study is evaluate the environmental impacts and desorption processes by hollow fiber membrane contactors using life cycle assessment methodology. On basis ReCipe 2016 Midpoint Endpoint methods, research results show that systems exhibit lowest across majority assessed categories in comparison with chemical separation systems. capture process via most...