A5062643911- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Topology Optimization in Engineering
- Atmospheric Ozone and Climate
- Air Quality Monitoring and Forecasting
- Acoustic Wave Phenomena Research
- Advanced Manufacturing and Logistics Optimization
- Catalytic Processes in Materials Science
- Advanced Multi-Objective Optimization Algorithms
- Composite Structure Analysis and Optimization
- Scheduling and Optimization Algorithms
- Air Quality and Health Impacts
- Thermodynamic properties of mixtures
- Advanced Decision-Making Techniques
- Assembly Line Balancing Optimization
- Composite Material Mechanics
- Manufacturing Process and Optimization
- Industrial Gas Emission Control
- Methane Hydrates and Related Phenomena
- Chemical and Physical Properties in Aqueous Solutions
Dalian University of Technology
2023-2024
Beijing Institute of Technology
2022-2024
Zhuhai Institute of Advanced Technology
2023
Peking University
2017
Northeastern University
2012
Severe winter haze events in Beijing and North China Plain are characterized by rapid production of sulfate aerosols with unresolved mechanisms. Oxidation SO2 O2 the absence metal catalysts (uncatalyzed autoxidation) represents most ubiquitous conversion pathway atmosphere. However, this reaction has long been regarded as too slow to be atmospherically meaningful. This traditional view was based on kinetic studies conducted bulk dilute solutions that mimic cloudwater but deviate from urban...
Accurately measuring the pH of atmospheric aerosols is a prerequisite for understanding multiphase chemistry that profoundly affects environment and climate systems. Despite advancements experimental techniques in situ measurements aerosols, current studies are limited to static aerosol microdroplets with an unperturbed composition. This steady-state scenario, however, deviates from real-world undergoing aging reactions, specifically, those characterized spontaneous displacement strong bases...
Aerosols in the atmosphere are effective microreactors for aqueous reactions converting primary pollutants to secondary fine particulate matter (PM2.5). These believed scale with volume of water, such as water deliquesced urban aerosols. Here, using single-particle Raman spectroscopy, we mapped scaling law conversion rate sulfite microdroplets, a key reaction producing sulfate PM2.5 and driving formation China's haze. We show that, droplets below approximately 100 μm, this scales not volume,...
Depletion of chloride, nitrate, or ammonium from atmospheric aerosols represents a unique class displacement reactions in which strong acids (HCl and HNO3) bases (NH3) are substituted by weaker ones (i.e., dicarboxylic dicarboxylate salts, respectively). These alter the aerosol composition perturb cycle volatile compounds, thereby affecting environmental systems climate. Despite profound implications, mechanism these remains unclear. Here, we elucidate thermodynamics kinetics using...
Transition metal ions (TMIs) are effective catalysts for atmospheric multiphase reactions that produces secondary air pollutants. The reactivity of TMIs depends on many factors, including metal's solubility and aqueous speciation, which can be complex in the urban pollution conditions. In this study, we examined speciation Cu(II) within fine particulate matters (PM 2.5 ) Beijing pollution. Using visual MINTEQ model PM composition data obtained from previous publications, predicted...
Acidity is a defining property of atmospheric aerosols that profoundly affects environmental systems, human health, and climate. However, directly measuring the pH aerosol microdroplets remains challenge, especially when microdroplets' composition nonhomogeneous or dynamically evolving both. As result, measurement technique with high spatiotemporal resolution needed. Here, we report spatiotemporally resolved in using spontaneous Raman spectroscopy. Our target sample was comprising sodium...
Negative Poisson's ratio (NPR) metamaterials are attractive for their unique mechanical behaviors and potential applications in deformation control energy absorption.However, when subjected to significant stretching, NPR designed under small strain assumption may experience a rapid degradation performance.To address this issue, study aims design maintaining targeted large by taking advantage of the geometry nonlinearity mechanism.A representative periodic unit cell is modeled considering...
Sulfate aerosol is one of the major components secondary fine particulate matter in urban haze that has crucial impacts on social economy and public health. Among atmospheric sulfate sources, Mn(II)-catalyzed SO2 oxidation surfaces been regarded as a dominating one. In this work, we measured reaction kinetics single droplets using an optical tweezer. We show occurs at Mn(II)-active sites surface, per piecewise kinetic formulation, characterized by threshold surface Mn(II) concentration...
Efflorescence of ammonium nitrate (AN) aerosols significantly impacts atmospheric secondary aerosol formation, climate, and human health. We investigated the effect representative water-soluble organic compounds (WSOCs) (sucralose (SUC), glycerol (GLY), citric acid (CA) on AN:WSOC efflorescence using vacuum Fourier transform infrared spectroscopy. Combining relative humidity (ERH) measurements, heterogeneous nucleation rates, model predictions, we found that viscosity, correlating with...
In this paper, we address the scheduling issues in a class of maintenance, repair and overhaul systems. By considering all key characteristics such as disassembly, material recovery uncertainty, matching requirements, stochastic routings variable processing times, problem is formulated into simulation optimization problem. To solve difficult problem, developed two hybrid algorithms based on nested partitions method optimal computing budged allocation technology. Asymptotic convergence these...
Sulfate formation is arguably the most important chemical process during urban haze events in China; however, complex mechanism of sulfate from SO2 remains unresolved. Recent studies showed regionally transported sea spray aerosols (SSAs) and transition-metal ions (TMI)-catalyzed oxidation are major contributors to near coastal regions. To better understand role SSA TMI catalysis, we investigated reaction kinetics Mn2+-catalyzed NaCl microdroplets using confocal Raman spectroscopy coupled...
Abstract To improve the material consumption smoothing for mixed-model assembly lines, this paper proposes a new optimized approach based on Euclidean distance and an improved target tracking algorithm. With method, average demands materials each product are calculated, distances between actual usage demand computed with formula, which is rate of materials. Then, rates sorted in order, minimum value listed as optimal scheduling. Therefore, by moving circles, scheduling all products can be...
Lightweight metamaterials with negative Poisson’s ratios (NPRs) have great potential for controlling deformation, absorbing energy, etc. The topology optimization [1] technique is an effective way to design metamaterials. However, as studied in [2], the NPR metamaterial configuration obtained under small deformation assumption may not maintain desired ratio relatively large conditions. This paper focuses on large-deformation based a gradient-free method, i.e. material-field series expansion...