Study on Stability and Applicability of Calcium Carbide Slag-Dealkalized Red Mud and Solid Waste Composite Materials in Road Materials.

The storage of highly alkaline red mud (RM) consumes land and threatens the environment, making its reuse crucial. The study used calcium carbide slag to dealkalize it, and analyzed the changes in mineral particles in RM using a CT scan. It then evaluated the stabilization effects of different materials and explored the mechanism of RM solidification through analysis of micro-mechanisms.

Numerical Study of Wear Characteristics of Vertical Shaft Planetary Mixer Blades.

The wear failure of vertical shaft planetary mixer blades under complex working conditions directly affects the quality and productivity of concrete. Given that it is time-consuming and labor-intensive to obtain the wear characteristics of mixer blades by experimental methods, this study used numerical simulation to analyze the effects of different factors on the wear characteristics of mixer blades based on the Hertz-Mindlin with JKR cohesive contact model and the Archard wear model. The results of this study show that under the influence of different factors, the blade is subjected to tangential cumulative contact energy and contact force is significantly larger than that in the normal direction, the wear of the blade is judged to be the form of abrasive wear accompanied by impacts, and the wear on the outer middle and lower edge regions of the blade is the most serious.

Effects of Process Parameters on Defect Formation in Laser Additive Manufacturing of a Novel Ni-Based Superalloy.

Laser additive manufacturing offers significant advantages for fabricating and repairing complex components. However, the complex solidification and remelting processes in nickel-based superalloys for additive manufacturing can introduce defects such as voids and cracks. Therefore, process parameters are crucial, as they significantly impact solidification and remelting, thereby affecting defect formation.

Critical Pathways for Transforming the Energy Future: A Review of Innovations and Challenges in Spent Lithium Battery Recycling Technologies.

In the wake of global energy transition and the "dual-carbon" goal, the rapid growth of electric vehicles has posed challenges for large-scale lithium-ion battery decommissioning. Retired batteries exhibit dual attributes of strategic resources (cobalt/lithium concentrations several times higher than natural ores) and environmental risks (heavy metal pollution, electrolyte toxicity). This paper systematically reviews pyrometallurgical and hydrometallurgical recovery technologies, identifying bottlenecks: high energy/lithium loss in pyrometallurgy, and corrosion/cost/solvent regeneration issues in hydrometallurgy.

Study on Similar Materials for Weakly Cemented Medium and Indoor Excavation Test.

The escalating disasters caused by the movement of shallow buried strata in China's western mining areas are increasingly threatening operational safety. A critical issue in ensuring secure mining practices in these areas is the creep failure of weakly cemented soft rock under low-stress conditions. The unique particle contact mechanisms in weakly cemented mudstone, combined with the persistence of the cemented materials and the particulate matter they form, lead to mechanical responses that differ significantly from those of typical soft rocks during loading.

The Structural Types of the Polarization Detection Unit in Imaging Polarimeter Based on the Stokes Parameter Method.

Bio-inspired imaging polarimeters have significant applications in the field of detecting the polarization state of skylights. The polarization detection principle of polarization detection units in polarimeters is mostly based on the Stokes parameter method. Using the Stokes parameter method, multiple linearly polarized lights modulated by the incident light need to be obtained.

Long-Endurance Collaborative Search and Rescue Based on Maritime Unmanned Systems and Deep-Reinforcement Learning.

Maritime vision sensing can be applied to maritime unmanned systems to perform search and rescue (SAR) missions under complex marine environments, as multiple unmanned aerial vehicles (UAVs) and unmanned surface vehicles (USVs) are able to conduct vision sensing through the air, the water-surface, and underwater. However, in these vision-based maritime SAR systems, collaboration between UAVs and USVs is a critical issue for successful SAR operations. To address this challenge, in this paper, we propose a long-endurance collaborative SAR scheme which exploits the complementary strengths of the maritime unmanned systems.

A molecularly imprinted electrochemical sensor for ovalbumin based on flower-like CuS nanomaterials.

A molecularly imprinted electrochemical sensor (SPCE@CuS/MIPs) for the quantitative detection of ovalbumin (OVA) was designed based on a CuS-modified screen-printed carbon electrode. CuS with a flower-like structure is conducive for increasing the specific surface area and adsorption capacity of the material and therefore improving the electrochemical response of the sensors. The imprinted polymers were deposited on the surface of SPCE@CuS by the electropolymerization method in the presence of polydopamine (PDA) and OVA.

Spatial pattern regulation strategy of bimolecular model with anomalous diffusion and nonlocal effects.

The mechanisms underlying the formation of spatial patterns in chemical reaction processes have been well established. However, there is still a lack of effective control methods for regulating the formation of spatial patterns and facilitating the transitions between different patterns. This article proposes a novel bimolecular model, incorporating nonlocal effects in reactions and molecular-level anomalous diffusion, within the two-dimensional reaction domain based on the previous framework.

Rational design of Ag@AgCl/g-CN/zeolite composite with significantly enhanced visible-light photocatalytic activity for tetracycline degradation and hydrogen evolution.

In the case of increasingly scarce global energy resources and worsening environmental problems, it is particularly important to explore effective ways to alleviate the environmental and energy crises. In this paper, a ternary Ag@AgCl/g-CN/zeolite photocatalyst was prepared for effective degradation of tetracycline (TC) and H production under visible light. Under visible light irradiation, the Ag@AgCl/g-CN/zeolite-25 photocatalyst demonstrates a remarkable degradation efficiency of 97.

Tailoring dual-hydrophobic microenvironment for tandem CO/CO feedstock to enhance CO electroreduction on Cu-based catalysts.

Achieving high selectivity for value-added products in the electrochemical reduction of CO remains challenging due to severe hydrogen evolution, sluggish CO mass transport and low *CO coverage. Herein, we integrate aerophilic SiO and polymer-functionalized copper nanoparticles (Cu-poly) to construct a hierarchical-hydrophobic Cu-poly/SiO composite, which limits the accessibility of HO, improves the local concentration of CO and enhances the dimerization of *CO-*CO. Comprehensive investigation using X-ray absorption spectroscopy, infrared spectroscopy and molecular dynamics simulations indicates that the polymer and SiO elevate the oxidation state of Cu species, enhance the CO diffusion coefficients (from 5.

Doped-graphdiyne: synthesis, theoretical prediction and application for electrochemical energy storage.

Graphdiyne (GDY), an emerging carbon allotrope with sp-sp hybridized networks, possesses a distinctive hierarchical architecture combining two-dimensional planar conjugation with three-dimensional porous frameworks. This unique configuration, characterized by abundant acetylene linkages and uniformly distributed nanopores, provides exceptional advantages for metal ion intercalation kinetics and heteroatomic integration. However, the material's development is constrained by morphological homogeneity and insufficient defect density.

Research note: Dietary curcumin cocrystals enhance egg quality and lipid metabolism in laying hens.

This study was conducted to evaluate the effects of dietary curcumin cocrystals on laying performance, egg quality, and lipid metabolism in laying hens. A total of 900 Hy-Line Brown laying hens, aged 43 weeks, were randomly divided into three groups, each consisting of 10 replicates with 30 hens per replicate. Each group received a diet supplemented with 0, 8.

Regional disparities and influencing factors of health production efficiency: evidence from China.

Background: The health of the populace is a fundamental pillar for China's sustainable economic growth. Health production efficiency refers to the ability to maximize the health outcomes of residents given a certain level of resource inputs. It reflects the efficiency of resource utilization in the process of health production.

Numerical analysis of coal rock gas dynamics disaster risk in coal thickness variation area and research on prevention and control.

During the mining process of deep coal mines, the coal thickness variation zone is highly prone to coal-rock-gas dynamic disasters. In order to promote the sustainable development of coal resource exploitation and utilization, the numerical simulation was carried out based on COMSOL software. The dynamic disaster mechanism of coal rock gas in the coal thickness variation area was revealed and corresponding prevention and control measures were given.

Built-in Interface electric field microenvironment in covalent organic framework modified heterojunction guiding Electron transfer for effective photocatalytic CO reduction.

Solar-driven photocatalytic CO₂ conversion represents an innovative and eco-friendly approach to transform the predominant greenhouse gas into renewable fuels. Nevertheless, the slow movement of electron-hole pairs significantly restricts its wider practical applications. To address the challenge, our study investigates into the underlying mechanisms of the built-in electric field microenvironment, with the aim of elucidating its role in the electron transfer process.

Ag⁺-Mediated Structural Reconstruction of a Metastable Cu Cluster Toward Cu-Ag Heterometallic Architectures for Superior Electrocatalytic CO-to-Ethanol Conversion.

Controlled structural transformations of metal nanoclusters (NCs) via dynamic bond reorganization provide fundamental insights into cluster reactivity and open avenues for functionality tuning. Here, we report a thiacalix[4]arene-protected Cu(I)-alkynide cluster, {NaCu(TC4A)(Ph-C≡C)} (Cu), which exhibits remarkable structural plasticity. This metastable cluster can grow into a Cu species via ion substitution or undergo thermal-induced fragmentation to form a smaller Cu cluster.

Optimized biosynthesis and performance enhancement of γ-PGA from Bacillus licheniformis: a study on wettability, microstructure, and environmental performance.

Extensive research has been conducted to mitigate the hazards of coal mine dust. Dust suppressants are crucial for enhancing the dust and fall efficiency of water media. Currently, environmentally-friendly, functional, polymeric, and microbial dust suppressant, which represent new types of suppressants, are primarily in the experimental and exploratory stages.

A simulation study on risk emergence mechanism and transmission path of coal mine workers' unsafe behaviours based on DEMATEL-ISM and Arena simulation.

In coal mine production activities, unsafe behaviours of workers are one of the important factors leading to frequent accidents, with the complexity of risk transmission mechanisms posing significant challenges to safety management. To systematically reveal the risk transmission rule of unsafe behavior risks, this study proposes a multidimensional research methodology: First, based on 574 coal mine accident investigation reports from 2019 to 2024, text mining techniques were employed to extract 26 key influencing factors, establishing an indicator system encompassing five dimensions: environment, individual, group, organizational management, and leadership. Second, an integrated DEMATEL-ISM method was adopted to construct a hierarchical structure model of influencing factors, identifying work experience and psychological status as fundamental causal nodes.

Polymer-linked growth wafer-sized Ruddlesden-Popper perovskite single-crystal films.

Wafer-sized two-dimensional Ruddlesden-Popper perovskite single-crystal thin films (SCTFs) hold immense potential as alternatives for fabricating large-scale optoelectronic devices and are anticipated to achieve commercial application in technologies such as high-performance micro-PeLEDs and integrated panels for advanced displays of the future. However, wafer-sized growth of perovskite single-crystal films remains challenging, primarily attributed to the inherent difficulties in controlling the nucleation process and managing the anisotropic growth behavior. These factors lead to rapid nucleation rate and high nucleation density, which impede crystal wafer-sized growth.

Gas-Water Two-Phase Seepage Model of Capillary Bundle Considering Pore Throat Structure and Analysis of Influencing Factors.

The technology for geological storage of carbon dioxide (CO) involves a complex gas-water two-phase seepage process. It is essential to clarify the two-phase seepage law in porous media to increase the efficiency of the CO storage. In this paper, based on the classical capillary bundle seepage model, parameters such as roughness, water film thickness, and pore throat ratio are introduced to modify the model, and the physical model of a rough curved capillary bundle considering pore throat structure is constructed.

Experimental Investigation on the Migration of Contaminant Generated in the Dry Distillation Channel to Overburden during Underground Coal Gasification.

Underground coal gasification (UCG) is a promising technique to develop coal resources efficiently and environmentally. However, contaminants generated from pyrolysis in the dry distillation channels during the UCG process have the risk of migration to the overburden, resulting in the potential contamination of groundwater. In this study, a new experiment was designed and carried out using overlying rock samples.

CFD Simulation Study on Nitrogen Injection to Suppress Coal Spontaneous Combustion in Goaf under Downward-Ventilation Conditions.

In the coal mining process, injecting nitrogen into the goaf is an effective method to suppress coal spontaneous combustion, which is widely adopted due to its significant inhibitory effect and low cost. Optimizing the injection volume and position of nitrogen is crucial for enhancing fire prevention and extinguishing efficiency and reducing safety risks. This study utilized CFD numerical simulation technology to investigate the spontaneous combustion risk in the goaf of the 81203 working face in Baode Coal Mine under the combined U + L ventilation and downwind ventilation conditions.

Chemical structures of dissolved organic matter control mercury isotopic fractionation during methylmercury photodegradation.

Methylmercury (MeHg) photodegradation can induce mass-dependent (MDF) and mass-independent fractionation (MIF) of mercury (Hg) isotopes, providing useful information for fingerprinting the transformation and transport of Hg species. However, Hg isotopic fractionation during dissolved organic matter (DOM)-mediated MeHg photodegradation remains poorly understood, constraining environmental application of this isotopic tracer. In this study, several low-molecular-weight aromatic thiols were selected to investigate the influence of DOM chemical structures on Hg isotope fractionation during MeHg photodegradation.

Research on the simulation of groundwater flow fields disturbed by coal mining based on multi-scale coupled decision-making.

Under the influence of subsurface engineering activities such as coal mining, the investigation of groundwater flow field variations holds significant importance for water resource management and environmental protection in deep aquifers. This study proposes a multi-scale coupled decision-based simulation method integrating microscopic physical properties of aquifers, macroscopic lithological distribution characteristics, and zonal modeling of coupled decision parameters. The proposed methodology integrates multi-scale characteristics of geological structures with spatially varied parameter weighting schemes, achieving comprehensive simulation of groundwater flow field variations induced by coal mining activities through systematic coupling of numerical modeling and decision support systems.