The influence of iron oxide on the phosphorus speciation transformation mechanisms in the Riparian Zone sediments.

Excessive phosphorus content can lead to eutrophication in rivers and lakes. Iron oxide plays a critical role in controlling the concentration, speciation, and transformation of phosphorus in water bodies and their sediments. This research selects the Jiehe Rivers of typical seasonal rivers in northern China as the research object.

Provenance and tectonic settings of late Triassic-Jurassic deposits in the Southwestern Yangtze block: evidence from the geochemistry, SW China.

During the Late Triassic to Jurassic, the western Yangtze Block transitioned from marine carbonate deposits to terrestrial detrital deposits. There are different views on the orogen evolution of the western margin of the Yangtze Block, such as whether the Longmenshan Thrust Belt was uplifted in the Late Triassic or Early Jurassic, and when the Yangtze Block began to receive the source from Yidun Terrane. In this paper, whole-rock elemental compositions and zircon U-Pb ages and Hf isotope data from the Upper Triassic to Jurassic successions are introduced.

Parametric analysis of passive ultra-low energy building envelope performance in existing residential buildings.

With the proposed goals of "energy conservation, carbon reduction, and green development," green and low-carbon lifestyles have gained significant attention. As a major sector of energy consumption, residential buildings face common issues such as high energy consumption, poor comfort, and aging facilities. Taking a residential building in the West Coast New Area of Qingdao, Shandong Province as a case study, this research employs field surveys and DesignBuilder software simulations to analyze the performance of building envelopes and interior walls in non-heated spaces.

Structural importance analysis and key chambers identification for chain instability of chamber group in coal mine.

Accurately locating the weak links in chamber group is crucial for achieving targeted and directional control for its surrounding rock. In this paper, the topological structure of the chamber group was first established, which divided the chambers into important chambers and general chambers. The chain instability inertia I was defined as the ratio of important chambers m to all chambers n, which can reflect the difficulty of chain instability for chamber group.

Investigating the closures of sea level budgets in China's adjacent seas.

Regional relative sea level changes are most relevant for coastal communities and remain challenging to understand. China's adjacent seas are among the world's most vulnerable regions to sea level rise. This paper investigates the sea level budgets in China's adjacent seas over the past 20 years.

Effect of internal curing by super-absorbent polymer on hydration of hydrophobic cement-based material.

Hydrophobic cement-based materials are a primary focus in current research due to their potential applications. Nevertheless, the presence of a hydrophobic layer often impedes the hydration process, resulting in reduced concrete strength. In this study, the use of super-absorbent polymer (SAP) to enhance the hydration degree of cement, thereby improving the mechanical properties of hydrophobic cement-based materials, was explored.

Layered double hydroxides/prussian blue analogs toward improved capacitive performances.

Nickel-based bimetallic hydroxides are widely used as supercapacitor electrodes owing to their high theoretical capacitance and cost-effectiveness. Nevertheless, challenges of low conductivity and substantial volume expansion exist during cycling processes. Herein, NiCo-layered double hydroxides (NiCo-LDH) nanosheets are electrodeposited on nickel foam (NF), followed by the generation of prussian blue analogs (PBA) on the surface of NiCo-LDH via the ion exchange, obtaining the NiCo-LDH/PBA.

GPS Galileo BDS3 LEO uncalibrated phase delays estimation and tight combination precise point positioning with ambiguity resolution.

Multi-system precise point positioning (PPP) can increase the number of observing satellites and improve the geometric configuration between the receivers and the satellites, and low-Earth orbit (LEO) satellites have fast motion and low orbital altitude, so the addition of LEO satellites can substantially improve the positioning accuracy. In this study, we simulated LEO observations, estimated the wide-lane (WL) and narrow-lane (NL) uncalibrated phase delays (UPDs) of the global positioning system (GPS), Galileo satellite navigation system (Galileo), Beidou-3 navigation satellite system (BDS-3) and LEO, performed multi-system tight-combination PPP and PPP-ambiguity resolution (AR) for stations in high, medium and low latitudes. The WL UPDs have good stability within 10 days, and more than 97% of the posterior residuals of each system are less than 0.

Impact of future climate trend and fluctuation on winter wheat yield in the North China Plain and adaptation strategies.

Research on the impacts of climate change on crop yield is crucial for improving agricultural management practices and enhancing climate adaptability. Although previous studies have explored the effects of climate trends and fluctuations on wheat yield, their combined impacts under future climate scenarios in the North China Plain (NCP) remain insufficiently understood. This study employs the DSSAT model to analyze the impacts of future climate trends and fluctuations on winter wheat yield.

Research on the mechanism and technology of close range coal seam support and roof cutting collaborative lane control.

Due to rock damage in close-range tunnels and difficulty controlling stability, proposes a precise surrounding rock control concept of goaf-retaining roadways in close-range without coal pillars. A mechanical model for the load transfer of overlying rock strata in the goaf under the roof cutting structure of the roadway is constructed, and a precise quantitative support design method for the surrounding rock without coal pillars is formed, with the main steps being the mechanical rock properties research, the design of support strength, and the optimization of support structure schemes. To clarify the mechanical properties of high-strength support structures for steel-reinforced concrete pillars, indoor tests were conducted on long pillar supports with different aspect ratios to analyse the deformation failure modes and bearing performance of long pillars.

Fractal theory-based analysis of strength degradation in steel slag powder-stabilized soil under chloride ion environment.

To investigate the impact of chloride ion erosion in marine environments on the microstructure and macroscopic mechanical properties of solidified soil, this study combines fractal theory with image processing techniques to analyze the changes in cement-solidified soil (CS), steel slag powder + cement-solidified soil (SSP-CS), and activator-doped steel slag powder + cement-solidified soil (A-SSP-CS) under different ion erosion conditions. Erosion tests were conducted for 7 to 120 days using seawater, distilled water, and typical corrosive ions in seawater (Cl⁻, Mg²⁺), and the unconfined compressive strength (UCS) of the specimens was measured. Scanning electron microscopy (SEM) and OpenCV techniques were employed to process microstructural images of the specimens, extracting and calculating the fractal dimensions.

Weakening behaviour of water saturated Island coal body subjected to SHPB tests.

To elucidate the impact of mine water on weakening mechanisms of coal under dynamic compressive loading conditions, this investigation employed experimental analyses utilizing Split Hopkinson Pressure Bar (SHPB) apparatus. Parameters including moisture content, impact gas pressure, and confining pressure were systematically varied to clarify the weakening properties. The results indicate a significant decrease in both the strength and stiffness of submerged coal under dynamic loading conditions.

Analysis of internal flow field characteristics in the nozzle of the three-phase jet fire monitor.

As a critical component of the three-phase jet fire monitor head, the nozzle efficiently converts fluid pressure energy into kinetic energy. Optimizing its structural parameters is essential for enhancing jet performance and firefighting efficiency. This study investigates the internal flow field of the nozzle using the VOF method, examining the influence of various structural parameters.

Novel insights into quorum-sensing microbe combined with dimethylsulfoniopropionate enhancing bioremediation of oil-contaminated sediment under typical deep-sea conditions: The performances and molecular mechanisms.

The deep-sea environment poses significant metabolic challenges to microorganisms, rendering the bioremediation of oil pollution even more formidable. Quorum sensing (QS) signals are known to assist microbiota in maintaining their function and stability under toxic contaminants. Dimethylsulfoniopropionate (DMSP) is an ideal cryoprotectant and stress protectant, enhancing microbial resilience in extreme environments.

Cerium-Based Nanozyme Functionalized by Conducting Polymers with Dual Enzyme Activities for Intelligent Colorimetric Sensing of Hexavalent Chromium.

Conducting polymers (CPs) have emerged as a class of promising organic conducting materials and attracted extensive attention due to their intrinsic electrical conductivity and easy synthesis process. New design strategies to enhance the catalytic activity of nanozymes by CP functionalization would be highly desirable. Herein, we report the fabrication of CPs-functionalized cerium-based nanozymes and study their application in the intelligent colorimetric sensing of Cr (VI).

Research Progress on the Hydrogen Embrittlement Resistance Performance of High-Entropy Alloys.

The concealment and delayed characteristics of hydrogen embrittlement (HE) pose significant challenges for the development of hydrogen-resistant materials. As a novel category of multi-principal-element alloys, high-entropy alloys (HEAs) have emerged as ideal candidates for the next generation of hydrogen-resistant alloys due to their unique design philosophy, which endows them with excellent mechanical properties, corrosion resistance, high-temperature stability, and hydrogen embrittlement resistance. In recent years, research on the hydrogen embrittlement resistance of HEAs has attracted extensive attention.

Study on the Deterioration of Chloride Erosion in Tunnel Construction Joints Under a Multifactorial Environment.

Structural crack seepage in concrete is a common condition in engineering applications. Under the combined effects of multiple factors such as water pressure and load, cracks are more likely to occur inside the concrete structure, thus aggravating the water seepage problem. To simulate the chloride ion erosion of structural cracks, an independent test system that can simultaneously consider the coupling effect of multiple factors was developed.

Development of Grouting Materials from Shield Sludge via Alkaline Hydrothermal Activation: A Resource Utilization Approach.

Frequently, the viscous mixture from shield operations is disposed of because its significant water ratio and the presence of polymers like foaming agents result in subpar structural qualities, contributing to the unnecessary consumption of land and the squandering of soil assets. Therefore, these problems urgently need to be solved economically and effectively. This study relies on the shield sludge produced by Qingdao Metro Line 6 project, and sand and shield sludge were used as the raw materials for synchronous grouting.

The Synthesis of Polycarboxylate Dispersants Containing Benzenesulfonic Acid Groups and Their Performance in Promoting Coal Particle Dispersion.

In this study, a polycarboxylate coal-water slurry dispersant (SSPA) containing benzenesulfonic acid groups was synthesized using allyl alcohol polyoxyethylene ether 500, sodium styrenesulfonate, and acrylic acid as raw materials. The effects of SSPA and a commercially available naphthalene-based dispersant (MF) on the slurry characteristics of low-rank coal were compared, and the maximum solid content of CWS prepared with SSPA reached 65.2%, which was 4% higher than that achieved with MF (61.

Portfolio Model Considering Normal Uncertain Preference Relations of Investors.

The paper examines the application of uncertainty theory to portfolio decision making, specifically focusing on constructing portfolio models based on uncertain preference relations. Firstly, we establish the theoretical foundation by introducing the theory of uncertainty, which includes uncertain measure and normal uncertain distribution. Then, building upon Markowitz portfolio theory, we propose an uncertain preference relation prioritization model with chance constraints and an additive consistency portfolio model to facilitate rational decision making in a complex and uncertain financial environment.

Comprehensive Stiffness Modeling and Evaluation of an Orthopedic Surgical Robot for Enhanced Cutting Operation Performance.

This study presents an integrated stiffness modeling and evaluation framework for an orthopedic surgical robot, aiming to enhance cutting accuracy and operational stability. A comprehensive stiffness model is developed, incorporating the stiffness of the end-effector, cutting tool, and force sensor. End-effector stiffness is computed using the virtual joint method based on the Jacobian matrix, enabling accurate analysis of stiffness distribution within the robot's workspace.

Flow Modification Effects and Mechanisms of Silicone Powder and PEG on UHMWPE/HDPE Blends: Insights from Experimental and Molecular Dynamics Simulations.

The high melt viscosity and poor flowability of ultrahigh molecular weight polyethylene (UHMWPE) hinder its spinning production efficiency and industrial-scale processing. In this study, a blend of UHMWPE and high-density polyethylene (HDPE) was modified by incorporating silicone powder and polyethylene glycol (PEG). By integrating experimental characterization with molecular dynamics simulations, this study investigates the effects and underlying mechanisms of flow modification induced by the individual and synergistic incorporation of PEG and silicone powder into UHMWPE/HDPE blends at both macroscopic and molecular levels.

A dataset of Natural Gas and Liquid Level for Oil Field Production Prediction in China.

Natural gas, a critical resource for national economies and public welfare, plays a significant role in the energy sector. The efficient production of natural gas is often hindered by the presence of formation water, which can adversely affect well productivity and operational efficiency. Accurate prediction of natural gas production and estimation of associated fluid accumulation are therefore paramount for optimizing extraction processes.

Experimental and Simulation Study on the Explosion of a Coal/Methane Mixed System.

This study investigates the microscale suppression mechanisms of four powder explosion suppressants on coal dust/methane (CH) mixed system explosions. Combining experimental and numerical simulation methods, we explore the gas-phase reaction processes and the role of free radicals in the explosion suppression. Results show that all suppressants reduce the maximum explosion pressure and pressure rise rate, with MPP being the most effective, reducing pressure by 38%.

The impact of family endowment on adolescents' physical activity behavior.

Objective: The cultivation of adolescent lifelong development is significantly influenced by family education, yet current approaches to physical activity promotion reveal critical systemic deficiencies. Family sports education remains underprioritized, while school-based physical education programs demonstrate diminishing efficacy. This situation is exacerbated by the absence of collaborative frameworks integrating community sports resources, collectively contributing to suboptimal sports participation rates among Chinese youth.