Characteristics of low-temperature oxidative heating and gas production in coal storage under forced convection: Influencing factors and mechanisms.

Slow oxidation of coal during storage and transportation poses significant risks, making it essential to identify hot spots and understand the heat generation and gas production patterns in coal stockpiles. This study leverages the advantages of adiabatic oxidation experiments, which account for time effects, to accurately describe the low-temperature oxidation process of coal through warming and gas production dimensions. Additionally, the warming and gas production patterns of three-dimensional coal stockpiles with varying stacking parameters were investigated.

Effect of Oxygen Concentration on Volatile Precipitation and Critical Ignition Point.

The purpose of this study was to investigate the impact of the oxygen concentration on the ignition of bituminous coal. Different oxygen concentrations and temperatures were used in the large-scale oxidation experiments to collect oxidized coals, which were then extracted with chloroform. And compare the critical ignition temperature of different mass samples.

Synergic Cellulose Nanofiber/Tourmaline Nanoparticle-Assembled Layered Piezoelectric Cryogels for High-Performance Airborne Particulate Filtration.

Here, hybrid stimuli-responsive (exhibiting pyroelectricity and piezoelectricity) porous cryogels are engineered by embedding tourmaline nanoparticles (TNs) in a cellulose nanofiber (CNF) skeleton to generate high-performance CNF-TN-based airborne particulate matter (PM) filters. First, single-layer hybrid cryogels with varying TN contents (0-5% w v) are assembled, and the design principles for multilayered filters are established based on a novel sequential pre-freezing and freeze-drying technique. As observed, the embedded TNs transformed the CNF network into a more homogeneous, isotropic, and firm structure, thus improving the structural integrity and thermal stability of the assembled cryogels while maintaining their ultrahigh porosity and low density.

An investigation into the zoning of ecosystem sensitivity control areas in Mentougou District (Beijing, China).

To achieve a more precise delineation of ecosystem sensitivity control areas, this study examines the Mentougou District in Beijing and introduces the Ecosystem Sensitivity Control Area Classification Method (ESCACM). This novel approach combines single-factor sensitivity analysis, multi-factor comprehensive sensitivity assessments, and strategies for zoning based on various ecological scenarios. The study categorizes the region into three specific zones: first-level management and control areas, second-level management and control areas, and non-management and control areas.

A cost-effective Ca-doped LiZrCl halide solid electrolyte for all-solid-state lithium batteries.

A cost-effective Ca-substituted LiZrCl solid electrolyte (SE) was fabricated by the mechanochemical method, exhibiting high Li conductivity, a wide electrochemical window and excellent compatibility with 4 V-class cathodes. The assembled all-solid-state battery with LiCoO achieves a high cycling performance for 150 cycles at 1C with a high-capacity retention of 83.1%.

Enhanced path tracking control of hydraulic support pushing mechanism via adaptive sliding mode technique in coal mine backfill operations.

The hydraulic support pushing mechanism is the primary equipment utilized in coal mine backfill operations, playing a crucial role in enhancing filling efficiency, ensuring a stable filling body, and managing gob safety. This paper focuses on analyzing the dynamic model and the interrelationship of the hydraulic cylinder, which serves as the power source for the pushing mechanism. To address the intricate coupling effects arising from the hydraulic cylinders and the displacement-force induced by the shared pump, this study employs feedforward compensation for decoupling analysis.

An Investigation of Extended-Dimension Embedded CKF-SLAM Based on the Akaike Information Criterion.

Simultaneous localization and mapping (SLAM) faces significant challenges due to high computational costs, low accuracy, and instability, which are particularly problematic because SLAM systems often operate in real-time environments where timely and precise state estimation is crucial. High computational costs can lead to delays, low accuracy can result in incorrect mapping and localization, and instability can make the entire system unreliable, especially in dynamic or complex environments. As the state-space dimension increases, the filtering error of the standard cubature Kalman filter (CKF) grows, leading to difficulties in multiplicative noise propagation and instability in state estimation results.

Cognitive Response of Underground Car Driver Observed by Brain EEG Signals.

In auxiliary transportation within mines, accurately assessing the cognitive and response states of drivers is vital for ensuring safety and operational efficiency. This study investigates the effects of various vehicle interaction stimuli on the electroencephalography (EEG) signals of mine transport vehicle drivers, analyzing the cognitive and response states of drivers under different conditions to evaluate their impact on safety performance. Through experimental design, we simulate multiple scenarios encountered in real operations, including interactions with dynamic and static vehicles, personnel, and warning signs.

Intelligent Identification and Prediction of Roof Deterioration Areas Based on Measurements While Drilling.

During roadway excavation, the presence of roof deterioration zones, such as layered spaces and weak interlayers, significantly affects the stability of the surrounding rock. To achieve timely and effective support for roadways, it is essential to utilize drilling measurement signals obtained during the construction of anchorage holes for the identification and prediction of these deterioration zones. This study systematically investigates the response characteristics of thrust, torque, and Y-direction vibration signals to different combinations of rock layers through theoretical analysis, laboratory experiments, ABAQUS dynamic numerical simulations, and field measurements.

Influence of Particle Rotation on the Shear Characteristics of Calcareous-Sand and Silica-Bead Granular Materials.

The shear strength and resistance of granular materials are critical indicators in geotechnical engineering and infrastructure construction. Both sliding and rotation influence the energy evolution of soil granular motion during shear. To examine the effects of particle rotation on shear damage and energy evolution in granular systems, we first describe the transformation of irregularly shaped particles into regular shapes via geometrical parameters, ensuring the invariance of energy density and density.

Anaerobic stabilization and landscape utilization of rural sewage sludge from the enhanced membrane coagulation process.

In this study, enhanced membrane coagulation (EMC) sludge was subjected to various alkaline (pH 7.2, 10, and 11), temperature (35 °C and 55 °C), and duration (0.5 h and 1 day) pretreatment conditions before being inoculated into biogas reactors operated for 176 days.

Identification of copper and lead pollution elements based on spectra of corn leaves in different leaf layers.

With the development of industrialization, environmental heavy metal pollution has become increasingly serious, and the growth of crops has been seriously affected by heavy metal pollution in the soil environment. Therefore, it is necessary to establish methods for distinguishing and monitoring heavy metal pollution. The application of hyperspectral remote sensing in heavy metal pollution monitoring demonstrates the great potential of using crop leaf spectra to accurately distinguish heavy metal pollution elements.

Change in aerosol optical depth in Chinese urban agglomerations during the early phase of dual-carbon actions.

Dual-carbon policies were implemented by Chinese government to mitigate climate warming; however, changes in aerosol optical depth (AOD) during early phases of these actions (2020-2022) remain unclear. Thus, AOD variations during this period were investigated compared to the baseline (2015-2019 mean) across seven urban agglomerations (UAs) using multi-source data. Significant temporal variations in AOD anomalies (ΔAOD) were observed at annual and seasonal scales, with varying magnitudes.

Long-term effects of underground mining on surface soil moisture and vegetation environment: evidence from the Xishan mining area.

This research aims to study the prolonged effects of underground mining on the ecological environment, particularly on surface soil moisture (SM) and fractional vegetation cover (FVC). Using 21 years of data (2000-2020) from the Xishan mining area, a novel quantitative relational model was developed to disentangle the effects of mining activities from those of climate, soil type, and topography. The findings reveal that climatic factors, such as precipitation and air temperature, have significant effects on SM and FVC, while soil type and topographic features are important factors affecting SM and FVC.

An ionic liquid-based delivery system of small interfering RNA targeting Bcl-2 for melanoma therapy.

Melanoma, characterized by rapid tumour progression and a strong tendency to metastasize, poses significant challenges in clinical treatment. Given the vital role of B-cell lymphoma 2 (Bcl-2) protein overexpression in inhibiting apoptosis in tumour cells, the suppression of Bcl-2 has emerged as a promising anticancer therapy. Here, we have developed a straightforward and effective delivery system that combines small interfering RNA (siRNA) targeting Bcl-2 (siBcl-2) with ionic liquids (ILs) for treating melanoma.

An exploration of improving stability of gob-side entry retained with graded and zoned pressure relief technology: a case study.

To address the issues of uncertain pressure relief effectiveness and poor control of surrounding rock caused by the composite nature of the roof strata in the gob-side entry retained (GER), as well as significant changes in strata's thickness and stability differences, this study focuses on the airway of the panel 3113 N in Longtan Coal Mine. Through field detection, theoretical analysis, and on-site applications, a stable mechanical model of the hard roof strata is established, elucidating the factors influencing fracture and instability in composite roof strata. The results indicate that roof stability of the GER depends on the position and ultimate load-bearing capacity of the hard roof strata, which in turn affects roof pressure relief effectiveness.

Correlating Personality Traits With Acute Stress Responses in Earthquake Simulations: An HRV and RESP Analysis.

Earthquakes, as significant natural disasters, still cannot be accurately predicted today. Although current earthquake early warning systems can provide alerts several seconds in advance, acute stress responses (ASR) in emergency situations can waste these precious escape seconds. To investigate the correlation between personality and ASR, this study collected the temperament and character of all participants using the Chen Huichang-60 Temperament Scale and the DISC Personality Inventory.

SnO surface modified SrFeMoO cathode with enhanced electrocatalytic activities for direct CO electrolysis in solid oxide electrolysis cells.

Surface modification and/or reconstruction for perovskite oxides cathode is an efficient strategy to accelerate sluggish kinetics of CO reduction reaction (CO2RR) in solid oxide electrolysis cells (SOECs). Herein, active SnO nanoparticles with average size of ∼10 nm are loaded on the surface of SrFeMoO (SFM) cathode via a facile wet infiltration method. Benefiting from improved specific surface area, expended three phase boundaries, optimized CO adsorption/activation abilities, as well as additional oxygen vacancies, the as-prepared SOEC with the SFM@SnO cathode delivers an enhanced current density of 0.

Data-driven prediction framework of surrounding rock pressure in a fully mechanized coal face with temporal-spatial correlation.

Surrounding rock pressure prediction for fully mechanized coal face (FMCF) roof management and control is of great significance. The key challenge is to effectively combine various factors to evolve the surrounding rock pressure trend with high temporal-spatial correlation and heterogeneity. The hydraulic support load is an important indicator that reflects the change in the surrounding rock pressure.

A review of advancements in the theory and characterization of soil macropore structure.

Soil has an intricate pore structure, with the macropore structure serving as a pivotal component of gas exchange, liquid flow, and solute transport within the soil matrix. Scientifically understanding the macropore structure is important for the exploration of soil ecological functions. Drawing upon research literature from diverse nations, this study presents a comprehensive summary of past research findings, thoroughly examining the definition and taxonomy of soil macropores.

Using online negative emotions to predict risk-coping behaviors in the relocation of Beijing municipal government.

This article explores the use of online negative emotions to predict public risk-coping behaviors during urban relocation. Through a literature review, the paper proposes hypotheses that anticipate advanced prediction of public risk-coping behaviors based on online negative emotions. The study's empirical focus is on the relocation of the Beijing municipal government, using time series data for Granger causality analysis in EViews 10.

Propagation behavior of coal crack induced by liquid CO2 phase change blasting considering blasting pressure effects.

To investigate the crack propagation mechanisms in low-permeability coal seams induced by liquid CO2 phase change blasting under different blasting pressures, this research presents an experimental study conducted on a small liquid CO2 phase change blasting test system. The failure mode, crack morphology, and distribution characteristics of the coal rock model specimens under different liquid CO2 phase change blasting pressure were revealed, analyzing the crack shapes and expansion process. The results show that with increasing blasting pressure, both the number and complexity of cracks significantly increase under liquid CO2 phase change blasting, evolving from simple linear cracks to more complex multi-directional networks.

Snowy Dove: An open-sourcetoolkit for pre- processing of Chinese Gaofen series data.

Since the launch of the Chinese High-resolution Earth Observation System (CHEOS) program, China has strengthened its research and development in the field of satellite remote sensing. A large number of sensors has been or will be launched, providing very large data streams which all require processing of the engineering data, as provided by the instruments, to physical data which will be used for further processing and interpretation. To handle such large data streams we developed a one-click batch pre-processing toolkit for CHEOS remote sensing data as described in this paper.