Intelligent control algorithms for posture and height control of four-leg hydraulic supports.

To address limitations of traditional inclinometers and height sensors in determining the posture and support height of hydraulic supports in coal mining, we propose a novel method predicated on travel measurements of the leg and tail beam cylinders. This method calculates the posture and height of hydraulic supports in mechanized mining. By conducting meticulous kinematic analysis of the hydraulic supports, a skeleton model of the main structural parameters of the hydraulic support was constructed.

An experimental study on the synergic damage of chemical solutions and stress to coal.

This paper investigates the impact of treatment with chemical solutions of varying pH values on the micro-macroscopic damage in coal samples under load, employing a combination of Small Angle X-ray Scattering (SAXS) experiments and uniaxial compression tests. The experimental results show that soaking coal samples in NaOH, HCl, and distilled water for 7 days leads to reductions in uniaxial compressive strength by 39.19%, 47.

Roles of nitrite in facilitating nitrogen and sulfur conversion in the hybrid bioreactor of Sulfate-reduced ammonium oxidation and anaerobic ammonium oxidation.

The hybrid bioreactor combining sulfate-reducing ammonium oxidation (Sulfammox) and Anammox offered potential for simultaneous nitrogen and sulfur removal, but the removal efficiency and microbial mechanism remain unclear. This study demonstrated that in the hybrid bioreactor, the ammonium utilization rate (AUR) of Sulfammox increased by 5.42 times.

Engineering Defect-Mediated S-scheme heterojunctions in MOF-Derived N-doped NiO porous microrods and ZnInS nanosheets for superior photocatalytic hydrogen evolution.

The development of efficient photocatalysts inspired by natural photosynthesis has drawn considerable interest for sustainable hydrogen (H) production. Among the various strategies for enhancing H evolution, constructing step-scheme (S-scheme) heterojunctions has attracted extensive interest, thanks to their limited charge recombination and enhanced charge transport in comparison to the traditional photocatalytic systems. Herein, we report the engineering of a novel S-scheme heterojunction by integrating ultrathin ZnInS (ZIS) nanosheets with MOF-derived N-doped NiO porous microrods (ZIS/N-NiO) toward superior photocatalytic behaviors.

Study on the foam production characteristics of air self-suction foam generator by jet.

Confined space fires could easily cause serious casualties and property damage, and foam is an effective means of preventing confined space fires. The existing foam generator does not have both momentum and foam expansion rate (FER) and is poorly suited to confined spaces. In order to develop a foam generator suitable for confined space fire protection, an in-depth analysis of the physical foaming characteristics of self-suction foam is required, and the structure of the foam generator is optimized accordingly.

Assessment of grazing livestock balance on the Eastern Mongolian Plateau based on remote sensing monitoring and grassland carrying capacity evaluation.

Rational utilization of natural resources is crucial in arid and semi-arid areas due to their vulnerable ecosystems and low resource resilience. Achieving a balance between grassland production and livestock grazing, known as the pasture-livestock balance, is essential for the sustainable development of grassland resources on the Mongolian Plateau (MP). This study focuses on the grassland regions of 8 provinces in eastern Mongolia (MNG) and 7 leagues in Inner Mongolia (IMNG), China, during the period from 2018 to 2022.

Novel approach to achieving net-zero carbon emissions for development and utilization of coal: Principle, methods, and cost estimation.

China's energy mix is coal-dominated; therefore, it is unrealistic for the country to achieve carbon neutrality through complete decarbonization. As the world's largest carbon emitter, achieving global carbon reduction targets necessitates that China develops low-carbon, clean, safe, and efficient coal development and utilization technologies. This study proposes a new low-carbon coal development and utilization method that integrates in-situ conversion mining and mineral carbonation (ICMMC) to realize coal mining and separation, in-situ backfilling, in-situ conversion, energy storage, and carbon sequestration.

Evolution of Gas Desorption Hysteresis in Coal under Negative-Pressure Condition: Attenuation Mechanism and an Intuitive Index.

Quantifying the extent of desorption hysteresis is essential for establishing gas flow models. However, existing indices fail to adequately represent the changes in the actively mobile gas volume involved in transport, and experiments on the degree of hysteresis in negative-pressure environments are scarce. Therefore, this study conducted isothermal adsorption and desorption tests under both atmospheric- and negative-pressure conditions.

Improved Method for the Calculation of the Air Film Thickness of an Air Cushion Belt Conveyor.

The air film thickness is an important parameter of an air cushion belt conveyor, which directly affects the compressed air supply power and operating resistance of the system. Therefore, it is important to calculate the bottom thickness of the gas film accurately in the design stage. A calculation method for the thickness of a conveyor air cushion was derived based on the mathematical model of the air cushion flow field for a multi row uniformly distributed air cushion structure.

Mechanical Properties and Damage Constitutive Model of Saturated Sandstone Under Freeze-Thaw Action.

In order to investigate the impact of freeze-thaw damage on sandstone under the coupling of ground stress and pore water pressure, three types of porous sandstone were subjected to freezing at different negative temperatures (-5 °C, -10 °C, -15 °C, and -20 °C). Subsequently, hydraulic coupling triaxial compression tests were conducted on the frozen and thawed sandstone. We analyzed the effects of porosity and freezing temperature on the mechanical properties of sandstone under hydraulic coupling and performed nuclear magnetic resonance tests on sandstone samples before and after freezing and thawing.

Optimized mesopore design in ginkgo nuts-derived hyper-crosslinked porous carbon for enhancing supercapacitor capacitance performance.

The capacitance performance of a co-doped carbon-based supercapacitor derived from Ginkgo nuts was significantly enhanced by optimizing the mesoporous structure through high-temperature pyrolysis combined with KOH activation. The precisely engineered GBHHPC-750-4 is characterized by a hyper-crosslinked 3D hierarchical porous structure, with an exceptionally high specific surface area of 3163.9 m/g, a substantial mesopore proportion (Vmeso/Vt = 74.

Z-scheme HPMoVO/g-CN heterojunction with strong photooxidative capacity for promoting efficient cleavage of C-C bond in lignin models and lignin.

The efficient photocatalytic breakage of C-C bonds has great significance for the valorization of lignin into value-added aromatic chemicals, but remains challenging owing to their demanding depolymerization conditions and high bond dissociation energies. In this study, the Z-scheme heterojunction HPMoVO/g-CN (HPA/CN) photocatalyst was elaborately developed for the selective and efficient cleaving of C-C bonds in real lignin and its β-O-4 models under mild conditions. The construction of Z-scheme heterojunction with irregular sheet micromorphology not only enhanced the charge separation and redox abilities, but also broadened the light absorption range and promoted charge-to-surface transfer in two redox components.

Revealing microbial compatibility of partial nitritation/Anammox biofilm from sidestream to mainstream applications: Origins, dynamics, and interrelationships.

Biofilms offer a solution to the challenge of low biomass retention faced in mainstream partial nitritation/Anammox (PN/A) applications. In this study, a one-stage PN/A reactor derived from initial granular sludge was successfully transformed into a biofilm system using shedding carriers. Environmental stressors, such as ammonium nitrogen concentration and organic matter, significantly affected the competitive dynamics and dominant species composition between Ca.

Sodium-Ion Storage in NaVMn(PO)/C Porous Nanorods Electrode.

NaVMn(PO) (NVMP) is a prospective cathode for sodium-ion batteries (SIBs) due to its low cost and extraordinary structural stability. However, poor conductivity restricts the electrochemical performance of NVMP, which limits its development and application. Herein, carbon-encapsulated NVMP porous nanorods are prepared via a convenient electrospinning method.

[Research Progress for the Toxic Effects of Microplastics on Soil Animals and Plants].

Terrestrial ecosystems represent the most direct and principal reservoirs of plastic contamination on Earth. The toxic effects of microplastic exposure on terrestrial plants have been analyzed from the perspectives of direct toxicity, indirect toxicity, and combined toxicity with other pollutants. By investigating the impacts on the growth, behavior, and oxidative stress responses of soil animals, the toxicological patterns of microplastics have been elucidated.

Insights into the influence of organic and salinity on the two-stage partial nitritation/anammox process in treating food waste digestate.

Food waste digestate (FWD), which contains significant levels of ammonium, organic matter, and salinity, can interfere with treatment performance of the anammox process. In this study, a two-stage partial nitritation/anammox (PN/A) process was established to investigate nitrogen removal and microbial response in treating FWD at a nitrogen loading rate (NLR) of 0.27 ± 0.

Two-point methods for evaluation of the minimum zone circle.

According to the cross-distribution of four control points of the minimum zone circle, the four-point conditions that two control points on the circumscribed circle and two control points on the inscribed circle meet are proposed. Based on these conditions, a two-point method is proposed, which is suitable not only for the determination of two control points on the circumscribed circle but also for the determination of two control points on the inscribed circle. In the iterative process, redundant data points can be simply determined by using dichotomy in order to improve computational efficiency.

Characterization of the Structure of Rice and Wheat Straw Pretreated with . AH.

. AH pretreatment (PT) enhances the conversion and selectivity of RS and WS in supercritical methanolysis. In this work, we investigated how .

Optimization of the Carbonization Process for the Preparation of High-Grade Needle Coke Based on the Response Surface Method and Microstructure Analysis.

Refined coal tar pitch (RCTP) with a quinoline insoluble (QI) content less than 0.01% was obtained from Wuhai coal tar pitch (CTP), which was used as a raw material to prepare needle coke by carbonization and calcination experiments. In this work, the effects of carbonization time, carbonization temperature, and carbonization pressure on the optical structure of green coke and the microstructure of needle coke were investigated.

Oxygen Vacancy Engineering of TiNbO Modified PE Separator Toward Dendrite-Free Lithium Metal Battery.

Lithium metal battery with high specific energy and high safety is crucial for the next-generation energy storage technologies. However, the poor thermal stability, lower mechanical performance, and poor electrochemical performance of the commercially available polyethylene (PE) separator hinders the development of high-specific lithium metal batteries. Herein, a functional PE separator is prepared by innovative coating the TiNbO microspheres with oxygen vacancies on the surface of PE (denoted as TNO-PE).