The long-term storage of coal gangue (CG) mountains causes serious environmental problems such as water and air pollution. Thus, sustainable reclamation practices are urgently needed to minimize the impacts brought by CG mountains. Pikovskaya medium was employed screen microorganisms, which were subsequently utilized promote solubilization CG. XRF, SEM, XRD, HPLC techniques characterize before after bacterial treatment. In this study, we have successfully isolated purified a strain,...

This paper investigates three-dimensional printing technology (3DPT) investment strategies promoting low-carbon supply chain development. A theoretical model is built in which either the manufacturer or retailer can lead an 3DPT. The main results are as follows: 1) always benefits from investing 3DPT and willing to investment, while also but only with a large cost coefficient of investment; 2) raises consumers' demands reduces units carbon emissions. Counterintuitively, implementing may...

ABSTRACT Accumulation of coal gangue (CG) poses significant risks to both human health and ecological systems, underscoring the urgent need for sustainable methods utilize this abundant waste material effectively. In study, we successfully screened isolated Bacillus velezensis bacterial strain enhance solubilization potassium (K) phosphorus (P) nutrients from CG. The study employed XRD, FTIR, SEM, HPLC techniques investigate underlying mechanisms CG solubilization. Various parameters such as...

<p style='text-indent:20px;'>This paper considers a supply chain in which an upstream supplier sells component to downstream manufacturer facing price and quality sensitive demand. The has chance make investment the manufacturer, can not only enable hold equity shares thus achieve profit sharing with but also provide resources for improve its product quality. Under any given strategy of supplier, equilibrium decisions two members on wholesale margin are characterized. Then, supplier's...

This paper investigates the steady state property of queue length for a batch arrival under N-policy with single vacation and setup times. When system becomes empty, server is turned off at once takes random . he returns, if reaches or exceeds threshold , immediately on but temporarily unavailable due to time before offering service. If not, stays in until least being We derive size distribution confirm stochastic decomposition property. also recursion expressions other performance measures....

The synergetic development level of port and city is an important index to measure the radiation effect port. Through systematic analysis study at port-city systems in Chengdu-Chongqing Economic Circle, this paper constructed a synergistics-based synergy degree model proposed system measurement for complex based on coupling coordination model. Results show that ports cities Circle are still far from high-level development. In general, comprehensive rising, which Chongqing ranks top rising...

Forecasting the volume of foreign trade is important to policy formulation for local governments. This study proposes a machine-learning algorithm as forecasting tool that based on Rough sets and Shannon entropy. uses historical data from large municipal examine proposed tool. The results suggest this can be useful in specific decisions with unique characteristics requirements.

This paper takes the two subsystems of inland ports and industries along Yangtze River as a composite system research object, providing insight into influence development efficiency coupling synergy degree industry. Firstly, effect port industry is qualitatively expounded, secondly, entropy weight TOPSIS method used to construct coordination model analyze measurement industrial relationship between River. Twelve cities were selected examples, their was evaluated by referring comprehensive...

This paper develops a new method for calculating the system size distribution on two different M/G/1 queueing under N-policy with general startup/closedown. Firstly, stochastic decomposition property is used to derive p.g.f. of distribution. By Leibniz formula derivation, we investigate additional distribution, and then, get recursion expression sizes Finally, several examples are given illustrating application sensitivity analysis also performed.

This paper considers an M/G/1 like-queue production system, with unreliable server under N-policy and single vacation. By renewal process total probability decomposition, we analyze the system reliability. Several important reliability indexes are obtained unique relationship between a unit repairable such model is presented, which help for analyzing more complicated system. Finally, sensitivity investigated by numerical example.

Supply chain emissions reduction is an important way to promote the development of a low-carbon economy and address climate challenges. Although scale livestream shopping has demonstrated unprecedented growth globally, especially since COVID-19 outbreak, livestreaming supply chains have also contributed significantly carbon emissions. Currently, optimisation models for governance are relatively lacking. To issue emission in chains, this study paper proposes three decision-making based on...

This paper considers a multinational green supply chain (MGSC), composed of manufacturer and foreign retailer affected by import tariff. The main theme this is to explore decisions coordination contract. Four decision models were investigated: (1) the centralized model (model CS), (2) decentralized DS), (3) R&amp;D cost sharing contract RD) with portion cost, (4) quantity discount-cost QD), which combined discount equilibrium these derived. was found improve greenness performance but cannot...

In this paper, we consider joint decisions on inventory rationing and replenishment from a regular supplier or backup with two classes of customers. When the on-hand falls below certain critical level, an policy is implemented to reject lower priority We investigated potential use as response policy. First, establish level transition equilibrium equation for steady-state probability distributions derive analytical performance indicators. Next, cost function nonlinear optimization model are...

Mirzahosseinian develop a closed-loop inventory system consisting of repair facility and single warehouse, for repairable parts operating under Performance-Based Logistics contract. They model the as multi-server queueing (M/M/m queue) where component failures follow Poisson distribution times at service are exponential. The sets up balance equations steady-state probability level. This paper extends their model. A recursive method is utilized an analytic level derived. It also demonstrates...