• Energy Research
• 2025-2025close

Schisandra Sphenanthera polysaccharides fractions (SSPs), namely SSP40, SSP60, and SSP80, were obtained by gradient precipitation with 40 %, 60 %, and 80 % (v/v) ethanol, respectively. It was found that gradient ethanol precipitation (GEP) significantly affected the physicochemical and structural characteristics of SSPs, including molecular weight, monosaccharide composition, and surface morphology. Compared to fractions SSP40 and SSP60, SSP80 was observed to have a lower molecular weight (22.58 kDa) and certain specific monosaccharide composition, such as lower glucose content and higher galactose, arabinose, rhamnose, and galacturonic acid content. Furthermore, the apparent porosity of the SSPs increased with increasing ethanol concentration in GEP. After fermentation at 37 °C for 48 h, fraction SSP80 prominently promoted the production of more short-chain fatty acids (SCFAs), increasing from an initial 1.39 ± 0.08 to 26.75 ± 0.54 mmol/L. The SSP fraction types extracted by GEP greatly affected the modulation of the intestinal microflora at different levels. The SSP80 fraction with excellent structure demonstrated the best ability to modulate the intestinal microflora by increasing the relative abundance of Bacteroides, Faecalibacterium and Dialister and decreasing the relative abundance of Escherichia-Shigella. The remarkable differences in modulating the intestinal microflora confirmed the importance of carefully selecting GEP to fraction SSPs that promote health.

In this study, an improved multigroup (MG) cross section library correction system for the DeCART2D transport lattice code was developed by introducing group-wise correction factors for absorption, fission reactions, and the scattering matrix. In this system, corrected cross sections are generated by the product of the correction factor and the cross section, and the library corrections are performed through multiple iterations using the fixed-point iteration method. To examine the performance of the improved correction system, APR-1400 benchmark analyses were performed using an optimized DeCART2D MG cross section library generated by the correction system. Notably, the library produced by the improved library correction system showed better accuracy in terms of reactivity and power distribution compared to a library generated by the existing library correction system and an uncorrected library. In the near future, the newly improved MG cross section library correction system will be applied not only to the 47-group library for pressurized water reactor systems but also to MG libraries with a larger number of energy groups for Gen-IV systems.

Introducción: Este trabajo presenta una propuesta educativa para el área de Educación Física en 6º de Educación Primaria basada en la recuperación de los juegos tradicionales de Castilla y León y el fomento de la movilidad sostenible mediante el uso de la bicicleta. Metodología: La propuesta se enmarca en la normativa educativa vigente y se apoya en metodologías activas como el Aprendizaje por Proyectos (APP), la Gamificación y el Aprendizaje Servicio (AS). Resultados: El resultado buscado es diseñar un circuito urbano de bicicletas con paradas en las que se practiquen juegos tradicionales. Discusión: Esta propuesta fomenta el desarrollo de competencias de autonomía, organización, espíritu crítico, conciencia social y emprendimiento a través de la Educación Física, alineándose con los Objetivos de Desarrollo Sostenible. La evaluación incluye autoevaluación, coevaluación y rúbricas criteriales. Conclusiones: El compromiso con su entorno más cercano, la conexión con sus abuelos y la gamificación son pilares fundamentales para el éxito de esta propuesta.

This pioneering work presents a novel approach for manufacturing B-doped ZrO2, creating in-situ ZrB2O5 within the ZrO2 matrix. A cost-effective hydrothermal synthesis using zircon mineral yields a material with exceptional radiation shielding properties. Incorporating B into the ZrO2 lattice combines ZrO2's gamma attenuation with B's neutron shielding against ionizing radiation. XRD, SEM, and EDX characterization revealed structural properties, phase compositions, and elemental distributions. Monte Carlo simulation and XCOM theoretical modeling investigated B atoms' role in shielding parameters across 0.0332–2.506 MeV γ-ray energies. Results show increased B concentration slightly decreases shielding properties while enhancing mechanical properties including crystallite size, lattice distortions, and dislocation density. B concentration increases from 2.1 to 5.4 wt% decrease LAC values to 65.959–58.613 cm-1 (0.0332 MeV), 0.464–0.461 cm-1 (0.511 MeV), and 0.208–0.270 cm-1 (2.506 MeV). B concentration up to 5.4 wt% enhances mechanical properties without significantly affecting radiation shielding, especially at intermediate energies.

ABSTRACTThe multi‐field coupling relationship and temperature evolution mechanism of gas‐containing coal in areas affected by geological structures were investigated, focusing specifically on the engineering aspects of a reverse fault in the No. 3 coal seam at the Xinjing Coal Mine. An analysis was conducted to examine the thermal‐fluid‐solid coupling behavior of gas‐containing coal. A thermal‐fluid‐solid coupling model for gas‐containing coal, accounting for the effects of damage, was developed to simulate the incubation process of coal and gas outbursts within the fault zone during the advancement of the working face. The study has indicated that faults not only degrade the mechanical properties of the surrounding coal‐rock mass, but also disrupt the continuity of coal seam stress. Gas tends to accumulate near fault zones, resulting in differences in the gas pressure and content on either side of the fault, thereby substantially increasing the likelihood of coal and gas outbursts. The primary factors influencing temperature variations include deformation energy, energy from gas expansion, thermal convection, thermal conduction, and the thermal effects associated with adsorption and desorption. Among these factors, the endothermic effect associated with adsorption and desorption significantly influences the temperature fluctuations in coal. The results of this study provide a theoretical foundation for exploring the mechanisms underlying coal and gas outbursts, improving the interdisciplinary coupling theory for coal and gas systems and employing temperature metrics to predict such outbursts.