Abstract Precipitation variations mostly affect the water resource planning in semi-arid regions of northwest China. The objective this study is to quantitatively explore spatial and temporal precipitation different time scales Xi'an city area. Mann–Kendall test wavelet analysis methods were applied analyze variability. In terms variation precipitation, results indicated that annual exhibited a significant decreasing trend during 1951–2018. Except for summer representing slightly increasing...

Land use has significant impact on the hydrologic and hydraulic processes in a catchment. This work applies hydrodynamic based numerical model to quantitatively investigate land effect flood patterns under various rainfall terrain conditions an ideal V-shaped catchment realistic catchment, indicating could considerably affect rainfall-flood process such varies with terrain, scenario events. The is less sensitive for side slope than channel slope. For lower critical value this work, forest...

Abstract High aggradation and degradation in a river induced by the last flood event will raise decrease risk of an upcoming event, respectively. To quantitatively investigate this effect, two-dimensional (2D) hydrodynamic model coupled with sediment transport river-bed evolution models is developed. After being validated against two experimental benchmark tests, applied to simulate effects morphological change on patterns. It found scale tests that bed may have substantial influence water...

Abstract Reports indicate that high-cost, insecurity, and difficulty in complex environments hinder the traditional urban road inundation monitoring approach. This work proposed an automatic method for experimental based on YOLOv2 deep learning framework. The is affordable, secure, with high accuracy rates evaluation. detection of was carried out under both dry wet conditions roads study area a scale few m2. validation average rate model 90.1% detection, while its training 96.1%. indicated...

ABSTRACT Road construction, as a product of modern civilization, can alter landscape patterns and accelerate erosion, especially in the loess tableland area China with fragile eco‐environment. Different types road could change land surface increased soil erosion different ways, while knowledge about this topic is limited. In study, our objective to evaluate changes along largest China. Results showed that: (1) The use type became more diverse three 1990–2020, leading fragmentation spatial...

Abstract A method was developed for the determination of atrazine residue and phytotoxicity on a nontargeted plant, Chinese cabbage. The analysis done by desorption electrospray ionization combined with ion trap MS/MS. Within range 63.13 to 2525 pg/mm2 specimen, linear relationship average peak area extracted product m/z 174 (y) versus surface concentration (x) estimated as y 5066.5x 85779; r 0.9994, RSD between 3.37 26.17. LOQ leaf lower than pg/mm2. is highly applicable detect evaluate...

Accurate and rapid simulation monitoring of urban inundation play important roles in flood prediction warning. This paper presents a case study campus-scale rainfall-flood inundation, including work, conducted at Xi’an University Technology. A surface hydrodynamic numerical model based on graphics processing unit (GPU) acceleration technology is proposed. It termed as GPU-accelerated water flow associated transport (GAST), employed to simulate analyze the rainfall runoff process drainage...

Drainage facilities are key infrastructure elements of urban stormwater drainage system (USDSs) for flood mitigation during short-duration extreme rainstorms. To obtain the optimal operation rules within shortest response time, a novel framework and approach was developed in this study. In proposed approach, complex USDS based on Storm Water Management Model (SWMM) to simulate rainfall runoff provide hydraulic characteristics, linked particle swarm optimization (PSO) algorithm design...

To reduce flood risk in urban areas, an optimal design of drainage networks for areas is essential flooding control and management the stormwater system (USDS). A conventional generally used networks, resulting high computational costs limited reduction effect. In this study, based on on-line data-driven evolutionary algorithm coupled with storm water model (SWMM), a novel approach USDS network optimization was developed. case Xi'an City, China, then selected practical implementation, where...

Multi-walled carbon nanotubes (MWCNT) were used as an efficient adsorbent to remove Paraquat (PQ) molecules from its aqueous solutions. The initial PQ concentration, adsorption time and temperature had considerable effect on the removal of onto MWCNT. MWCNT followed pseudo second-order kinetic model involving particle-diffusion mechanism. isotherms fitted by Langmuir isotherm, with maximum capacity based former 79.365 mg·g-1. Thermodynamic parameters, including Gibbs free energy changes...

To explore the ameliorative effect of yeast extract(YE) on inflammatory response human hepatoma cells(HepG2) induced by ethyl alcohol(EtOH) and lipopolysaccharide(LPS), further potential molecular mechanism based Toll-like receptor 4(TLR4)/nuclear factor kappa B(NF-κB) signaling pathway.

Activated carbon (AC) materials, renowned for their high specific surface area, excellent conductivity, and customizable functional groups, are widely employed as catalyst carriers. However, enhancing the activity of Ru-based catalysts supported on AC (Ru/AC) ammonia decomposition remains a challenge. In this study, commercial was utilized substrate, with glucose urea modifiers. Specifically, modified via hydrothermal pyrolysis method, resulting in successful post-treatment situ co-doping...

Different from the classical self-assembly process in soft matter, we have proposed concept of unimolecular nanoparticles (UMNPs), which act as spherical motifs and can directly pack into the...

Residential areas are major of runoff during urban floods, and many low-impact development (LID) measures have been developed to alleviate at the source. In this paper, our goal is provide a refined modeling method simulate entire physical rainfall–runoff process thereby help communities visualize actual routing quantify timing peak magnitude. The employs two-dimensional (2D) hydrodynamic numerical model considers discharge downspouts overflow ports based on high-resolution digital elevation...

In order to investigate the feasibility of using methacrylic acid (MAA)-styrene (St) copolymer as dispersants disperse azoxystrobin particles in aqueous suspension, adsorption kinetics, isotherm and thermodynamics MAA-St onto particle surfaces were studied by batch equilibrium experiments. The results showed that process followed pseudo-second-order kinetic model with entire adsorption, rate decreased initial concentration increasing. data fitted Langmuir equation better. thermodynamic...

The adsorption of methacrylic acid-styrene-acrylic polyethers (MAA-St-APEG) copolymer on the insecticide imidacloprid particles was studied to calculate kinetic, isotherm and thermodynamic parameters. kinetic data followed pseudo-second order model, equilibrium were well fitted by Langmuir model with maximum amount 7.610 mg·g-1 at 298 K. calculated parameters including ΔG, ΔH ΔS, demonstrated that this a spontaneous exothermic process in nature. Therefore, MAA-St-APEG are eligible for...