Both the suddenness and seriousness of COVID-19 have caused a variety public opinions on social media, which becomes focus attention. This paper aims to analyze strategies regarding prevention guidance opinion spread under in networks from perspective emotional characteristics user texts. Firstly, model is established mine text-based tendency based Susceptible-Infectious-Susceptible (SIS) model. In addition, mathematical simulation analysis presented. Finally, an empirical study data...

Facility location, inventory control, and vehicle routes scheduling are critical highly related problems in the design of logistics system for e‐business. Meanwhile, return ratio Internet sales was significantly higher than traditional business. Many returned merchandise have no quality defects, which can reenter channels just after a simple repackaging process. Focusing on existing problem e‐commerce system, we formulate location‐inventory‐routing model with defects returns. To solve this...

Third-party logistics (3PL) is a fast growing business. Many large organisations are using 3PL services to reduce operating costs, simplify business processes, and enhance operations supply chain flexibility. In this paper, we study location-inventory decisions jointly in closed-loop system with 3PL. First, model formulation proposed develop mixed-integer non-linear programming (MINLP) models for the problem under study. Then, novel heuristics based on differential evolution genetic...

Background: This approach to improving mental health, resilience, and development of the character learners integrates spirit sports into ideological political education. Physical activity induces cellular molecular adaptations including muscle tissue remodeling, neurotransmitter modulation, anti-inflammatory processes, this basis underlies potential principles stimulate motivation ethical in educational settings. Objective: Based on this, study seeks fill gaps current research by exploring...

This paper presents a closed-loop location-inventory-routing problem model considering both quality defect returns and nondefect in e-commerce supply chain system. The objective is to minimize the total cost produced forward reverse logistics networks. We propose combined optimization algorithm named hybrid ant colony (HACO) address this that an NP-hard problem. Our experimental results show proposed HACO considerably efficient effective solving model.

Facility location, inventory management, and vehicle routing are three important decisions in supply chain location‐inventory‐routing problems consider them jointly to improve the performance efficiency of today’s networks. In this paper, we study a problem minimize total cost closed‐loop that has forward reverse logistics flows. First, formulate as nonlinear integer programming model optimize facility control, simultaneously such system. Second, develop novel heuristic approach incorporates...

To design sustainable supply chain systems in today’s business environment, this paper studies a location-inventory problem closed-loop by considering the sales of new and used products primary secondary markets, respectively. This is formulated as mixed-integer nonlinear program to optimize facility location inventory management decisions jointly, logistics flows between two markets are modeled dynamically. solve efficiently, heuristic approach also developed introducing an effective...

Commercial product returns represent a growing financial and operational concern for many firms, they consist of true false failure in the real-world business. This paper studies joint location-inventory problem closed-loop system by considering multi-commodity flows commercial returns. First, this is formulated as mixed-integer nonlinear programming model. Next, novel heuristic method based on differential evolution designed to solve model efficiently. Finally, numerical experiments results...

A three-dimensional mathematical model and numerical techniques were developed for simulating a moving gas metal arc welding process. The is used to calculate the transient distributions of temperature velocity in weld pool dynamic shape aluminum alloy 6005-T4. Corresponding experiments conducted good agreement with modeling predictions. existence commonly observed cold-weld at beginning weld, ripples surface bead, crater end all predicted. measured microhardness around bead was consistent...

The fabrication and characterisation of a gate‐first In 0.7 Ga 0.3 As channel Π‐gate junctionless transistor by CMOS‐compatible top‐down approach is reported for the first time. structure uses simple layer process flow. 3D device simulation shows that can deplete carriers more effectively compared with planar tri‐gate devices. fabricated 200 nm gate length good transfer characteristics I on / off ratio ∼10 4 subthreshold swing ∼210 mV/decade. results indicate suitability proposed operation.

In China, most of peer‐to‐peer (P2P) lending platforms do not possess operational sustainability due to excessive defaults. To address this problem, the conflict interests among P2P participants is discussed using a stakeholder approach. An evolutionary game model (EGM) three players developed analyse interactions regulatory authorities, platforms, and borrowers. Then, asymptotic equilibrium stability strategies EGM are analysed. Results indicate that either or borrowers will choose...

Abstract Product recovery is an important business because of its great economic, social, and environmental benefits in practice. In this paper, a location-inventory problem (LIP) closed-loop supply chain (CLSC) investigated to optimize facility location inventory control decisions by considering product recovery. The objective minimize the total cost operations system. We formulate as mixed-integer nonlinear programming model design modified hybrid differential evolution algorithm (MHDE)...

Customer returns are a common phenomenon in many industries, and they have significant impact on business organizations their supply chains. False failure returned products that no functional or cosmetic defects, represent large body of customer practice. In this paper, we develop mixed‐integer nonlinear programming model to study multicommodity location‐inventory problem forward‐reverse logistics network. This minimizes the total cost network by considering false returns, it also considers...

In this paper, a bike repositioning problem with stochastic demand is studied. The formulated as two-stage programming model to optimize the routing and loading/unloading decisions of truck at each station depot under demands. goal minimize expected total sum transportation costs, penalty costs all stations, holding cost depot. A simulated annealing algorithm developed solve model. Numerical experiments are conducted on set instances from 20 90 stations demonstrate effectiveness solution...

This article studies the transient weld pool dynamics under periodical impingement of filler droplets that carry mass, momentum, thermal energy, and species in a moving 3D gas metal arc welding. The complicated transport phenomena are caused by combined effect droplet impingement, gravity, electromagnetic force, plasma surface tension force (Marangoni effect). shape distributions temperature, velocity, calculated as function time. “open close-up” for crater corresponding analyzed. commonly...

Both mathematical modeling and experiments have been conducted on the formation of cold weld in gas metal arc welding (GMAW) aluminum alloy 6005-T4. Transient pool shape distributions temperature velocity were calculated by a three-dimensional numerical model. The final bead dimensions peak heat-affected zone (HAZ) obtained. Three techniques proposed to input more energy at initial state improve penetration. simulation experimental results show significantly improved penetration start welding.

Recent frequent “thunderstorm incidents” of the internet financial platforms (IFPs) have caused panic investors. In order to measure and reduce investment risk IFPs, focus this study is evaluate reputation IFPs regarding risk. First, evaluation indicator system constructed from two dimensions direct indirect reputations. Then, based on system, an improved fuzzy approach (IFEA) integrating method comprehensive (FCE), analytic hierarchy process (AHP), factor analysis (FA) are proposed for...

In China, many Internet financial platforms (IFPs) are grappling with sustainability challenges due to elevated default rates, which have triggered widespread investor anxiety. To evaluate the practices of these platforms, we propose a reputation evaluation model designed rank IFPs based on their sustainability. The economic an IFP is decomposed into three components: scale strength, capital liquidity, and sustainable operating capability. Through analysis correlation relationships between...

A phosphoronitrile-based COF (HP-COF) was prepared employing a facile heat reflux method. Then, HP-COF employed as the precursor to acquire N, P-doped porous carbon materials by carbonization. novel...