Abstract: Building a socialist cultural powerhouse is foundational to achieving the great rejuvenation of the Chinese nation. Accessibility to cultural facilities serves as a critical metric for assessing the equitable distribution of urban cultural resources. Leveraging public cultural facility POI data and ArcGIS software, this study employs an improved Gaussian Two-Step Floating Catchment Area (Ga2SFCA) model to evaluate the accessibility of cultural facilities across Suzhou City. By integrating clustering analysis of accessibility outcomes and supply-demand dynamics, the study identifies distinct accessibility patterns among demand units. Key findings include: (1) The enhanced Ga2SFCA model significantly improves evaluation accuracy. (2) While Suzhou City exhibits high overall accessibility to cultural facilities, spatial distribution remains highly uneven, with accessibility declining sharply from the urban core to peripheral areas. (3) Demand units are categorized into four clusters: High-Supply High-Demand High-Accessibility (HS-HD-HA) Units, High-Supply Low-Demand High-Accessibility (HS-LD-HA) Units, Low-Supply Low-Demand Low-Accessibility (LS-LD-LA) Units. Read More

Abstract: Yellow River Basin, which suffered from water shortage and drought disaster frequently, has a need to use soil moisture information precisely to assist the agriculture, drought monitoring, and climate research. The high resolution dataset is very useful for the resource management. Conventional ground based monitoring is difficult and limited on precision due to their spatial resolution and costs, but remote sensing is able to overcome due to its scalability; however due to the limitation of satellite dataset resolution, remote sensing plays a limited role in soil moisture observation. Here, we review the latest approaches in soil moisture retrieval with optical, microwave and GNSS-Reflectometry (GNSS-R) technologies and put particular emphasis on their applications in YRB. Optical approaches offer fine spatial resolution but cannot penetrate in clouds and canopy cover, while microwave and GNSS-R technologies can measure all weather with an effective depth up to 5 cm. The practicality of case studies are demonstrated in regional case studies (AVHRR-based deep-layer retrievals in 1982–1989 and multi-source data fusion in 2016–2018). In both cases, challenges are unresolved such as, insufficient resolution and/or inconsistent datasets. Further studies need to: 1) employ a region-specific model suitable for local hydrological characteristics, 2) enhance root-zone moisture estimation for near real time applications, and 3) provide a region-wide dataset based on multi-sources data fusion. Such breakthroughs are important in order to achieve increased farming resilience and sustainability in the basin. Read More

Abstract: With the rapid development of transportation infrastructure in China, an increasing number of railway, highway, and urban rail transit projects have emerged like bamboo shoots after rain. Nevertheless, many tunnel projects still face significant challenges during construction, which constrain overall transportation development. In tunnel engineering, adverse geological formations such as fractured zones, karst caves, and faults are frequently encountered. Failure to detect these hazardous geological bodies in a timely manner and implement appropriate construction measures may not only delay project progress but also pose serious threats to the safety of construction personnel. Tunnel advanced geological prediction technology, employing the seismic reflection method, provides accurate characterization of geological conditions near the tunnel face. As an approach for advanced detection, wavefield forward simulation offers convenience and precision. However, reliable forward simulation requires accurate geological models. Therefore, this study focuses on analyzing the characteristics of various geological models and develops a programmatic approach to generate these models to meet the requirements of forward simulation. Finally, the wavefield characteristics are comparatively analyzed based on the forward simulation results derived from the geological models. Read More

Abstract: Edge effect is a key concept in ecology and biodiversity conservation, playing a vital role in studying ecological processes at the ecosystem and landscape scales. Drawing on the concept, mechanisms, and connotations of edge effects, this paper analyzes the impacts of fire disturbance on agro-forest ecotones from multiple angles. Six indicators, including the Shannon-Wiener index, Simpson index, Margalef index, Pielou evenness index, tree height, and average diameter of new shoots, are used to assess edge effect intensity. By examining how fire disturbance affects ecosystem structure, species composition, and functions, this study aims to quantify its impacts on biodiversity and ecological processes in agro-forest ecotones. The findings provide a scientific basis for ecological restoration, fire prevention strategies, and forest management, helping to mitigate fire risks and protect regional ecosystems and biodiversity. Read More

Abstract: China is both the world's largest clean energy market and the world's largest polluter. However, nearly a third of the world's CO2 emissions also come from China. The Chinese government recognizes the importance of changing household lifestyles and energy consumption patterns to achieving the "two-carbon goal". Therefore, vigorously promote residential photovoltaic power generation (PV) and the transition from traditional fossil fuels to renewable energy sources (such as solar power generation). This paper studies the influencing factors on residents' willingness to conduct sustainable energy use. Read More

Abstract: Coalbed methane (CBM) broadly refers to all natural gas found in coal-bearing strata, while the more specific definition pertains to methane gas trapped within coal seams and the adjacent tight sandstone reservoirs. In China, there is significant potential for the "increase of reserves and production" of coalbed methane, which holds substantial strategic value for national energy security. However, the current resource discovery and utilization rates remain extremely low, revealing a significant disparity. This paper analyzes the six fundamental geological characteristics of coalbed methane, including its gas storage state, reservoir diversity with strong cyclicity, complex gas-water distribution within coal seams, variable relationships between source rocks and cap rocks, and the fragile dynamic equilibrium of overlapping gas-bearing systems. Using the northern and eastern parts of the Ordos Basin, particularly the Linxing and Ma-4 segments, as case studies, this paper examines the characteristics of coalbed methane accumulation, source rock conditions, reservoir conditions, and fracture development. The findings provide insights into the coalbed methane accumulation characteristics of the Ordos Basin and offer valuable reference for future CBM exploration and exploitation in China. Read More

Abstract: Hydraulic fracturing is an effective technique for enhancing coal seam permeability. While coal as a macromolecular organic material, can be biodegraded by microorganisms, limited research has explored the integration of these processes to develop bioactive fracturing fluids. This study employed Shengli lignite from Inner Mongolia as the substrate and coal seam mine water as the microbial inoculum. Through single-factor experiments and orthogonal experimental design, investigated the effects of wetting agent concentration, clay stabilizer concentration, and demulsifier concentration in bioactive fracturing fluid additives on the microbial methanogenesis of lignite. The results indicate that, in terms of their impact on gas production, the three factors rank in descending order of significance as follows: wetting agent concentration, clay stabilizer concentration, and demulsifier concentration. Orthogonal analysis identified the optimal additive combination for bioactive fracturing fluid as 0.15% wetting agent, 2% clay stabilizer, and 0.15% demulsifier by mass concentration. The optimized formulation led to a substantial 31.73% increase in biogas yield compared to the pre-optimized condition. Three-dimensional fluorescence spectroscopy revealed that the fluorescence intensity of fulvic acid-like and humic acid-like substances was higher after optimization, indicating more complete degradation of the coal samples. Furthermore, metagenomic sequencing analysis demonstrated that the optimized bioactive fracturing fluid significantly improved the microbial community structure, markedly increasing the abundance of Methanosarcina. The predominant methane metabolism pathways were acetate fermentation and carbon dioxide reduction, with a substantial increase in the gene abundance related to methanogenic pathways, thereby promoting microbial methane production. These findings elucidate the mechanistic effects of bioactive fracturing fluid composition on lignite biogasification … Read More

Abstract: With the gradual mining of the mine to the deep, the mine will face the problem of heat damage, and the high temperature of the working face will seriously affect the production efficiency of the mine. Therefore, it is necessary to adopt the corresponding cooling measures to cool the high temperature mine. This paper aims to summarize the current high temperature mine cooling technology at home and abroad, analyze its advantages and disadvantages, and provide corresponding technical application ideas for high temperature mine cooling. Read More

Abstract: This paper systematically analyzes the geological characteristics of tight reservoirs, including structural characteristics, sedimentary characteristics, reservoir characteristics, formation pressure and fluid characteristics and temperature field characteristics. The study shows that the distribution of tight reservoirs is significantly influenced by the tectonic environment and sedimentary facies belt, and the reservoirs are characterized by low porosity and permeability, strong heterogeneity and complex pore structure. At the same time, the properties of crude oil are complex and abnormal formation pressure is common. On this basis, this paper constructs a technical system for efficient development of tight reservoirs, covering key technologies such as reservoir evaluation, fracturing reconstruction, displacement technology, numerical simulation and real-time monitoring, and establishes an evaluation index system for technical adaptability from three aspects of reservoir conditions, development effect and economy, and realizes dynamic optimization by coupling multiple methods. In view of the technical bottleneck in the development of tight reservoirs, some improvement directions and suggestions are put forward, such as optimization of reservoir reconstruction technology, improvement of displacement technology, real-time monitoring and dynamic regulation, and optimization of development scheme, in order to provide theoretical basis and technical support for the economic and efficient development of tight reservoirs. Read More

Abstract: This study based on nuclear magnetic resonance (NMR) technology, systematically evaluated the microscopic damage mechanism of fracturing fluids on tight sandstone reservoirs. Through core displacement experiments, combined with permeability tests and T2 spectrum analysis, the impact of fracturing fluids on the pore structure and seepage capacity of the reservoir was quantified. The experimental results showed that the core permeability significantly decreased (35.76% to 66.41%) after fracturing fluid displacement, with an average matrix damage rate of 54.55%. The NMR T2 spectrum indicated that the high-molecular components in the fracturing fluid preferentially invaded and adhered to the medium and large pores, causing their pore size distribution to shift towards micro and small pores, and the overall pore volume decreased. X-ray diffraction analysis revealed that the water-induced swelling of clay minerals further exacerbated the blockage of medium to large pore throats, destroying the seepage channels. The study confirmed that the main cause of damage to tight sandstone reservoirs was the physical blockage of medium to large pore throats by fracturing fluids and the water sensitivity effect of clay minerals, providing key experimental evidence for the optimization of fracturing fluid formulations and reservoir protection. Read More

Abstract: Large-scale, continuous, and high-intensity mining of underground coal resources in mining areas often leads to large-scale surface subsidence, sometimes up to several meters. The use of InSAR to monitor subsidence usually faces two key challenges: rapid and large-gradient subsidence often leads to image decorrelation, which hinders the acquisition of accurate deformation measurements. In addition, InSAR-based monitoring is limited to one-dimensional line-of-sight (LOS) displacement, which limits its ability to fully capture three-dimensional surface deformation. To overcome these obstacles, this study combines InSAR and PIM technology, and uses a spatial interpolation method to obtain continuous surface subsidence data in a geographic coordinate system to generate a surface displacement basin map in the mining area. A three-dimensional displacement model was established based on the proportional relationship between horizontal surface movement caused by mining of inclined coal seams and surface inclination. A field test was carried out in Yangchangwan Coal Mine, and the method was applied and its accuracy analyzed using five Sentinel-1A images from October 2022 to January 2023, combined with leveling data. The experimental results show that this method can obtain surface subsidence information around the mining area more accurately, the overall subsidence situation is more consistent with the actual situation, and the monitoring capability is significantly improved compared with InSAR and PIM. Read More

Abstract: Water resources is one of the important resources of human society In order to scientifically analyze and promote sustainable development, it is necessary to build a comprehensive evaluation system of multiple elements of water resources carrying capacity. Therefore, based on the four dimensions of quantity, quality and flow of water resources, it is constructed by target layer, dimension layer This paper mainly uses analytic hierarchy process, AHP model and TOPSIS evaluation model to evaluate the current situation of water resources carrying capacity in Hanjiang River Basin, so as to provide theoretical support and foundation for ecological construction and urban development in the upper reaches of Hanjiang River, The evaluation results are as follows: ① the AHP model and TOPSIS evaluation model used in this paper can clarify the water resources carrying capacity and the water temporal and water spatial evolution of water resources in the upper reaches of the Han River; ② on the whole, the water resources carrying capacity in the upper reaches of the Han River is excellent, and thanks to the continuous improvement of the local water use system, the water resources carrying capacity is increasing year by year. Although there are individual differences in different regions, they all have their own rising space, among which Hanzhong City has the best performance. Read More

Abstract: Under the background of “double carbon” target, injection of CO2 into oil reservoirs has attracted a lot of attention as a key technology pathway to enhance crude oil recovery and realize geological storage of CO2. In the past decade, CCUS (Carbon Capture, Utilization and Storage) technology has become a research hotspot in the process of global energy transition by virtue of its dual benefits of carbon reduction and production increase in the oil and gas industry. Currently, most of the major oilfields in China have been under water-driven development for a long period of time, and they are facing the problem of high and stable production, and their development programs need to be adjusted urgently. Based on the above situation, this study carried out indoor oil drive physical simulation experiments, aiming to compare the effect of CO2 oil drive after water drive. The experimental results show that CO2-assisted oil drive is effective, the recovery rate from the test basis and technical reference, is expected to help the oilfield to meet the energy demand at the same time, and effectively promote the realization of the “double carbon” goal. Read More

Abstract: This study examined the culture of preparedness and disaster resiliency among college students in a vocational college in Hunan Province, China. It aimed to assess students' levels of disaster resilience and preparedness culture to inform the development of targeted interventions and educational programs that enhance safety and mitigate the impact of future disasters on this vulnerable population. The study involved 384 college students enrolled in a vocational college in Hunan Province. Data were collected using a self-constructed questionnaire specifically designed to address the study’s objectives. The findings revealed that the majority of respondents were young male students from Generation Z, aged 19 to 22, predominantly in their first year of study and majoring in Fire Protection Information and Security. Results indicated a generally positive culture of preparedness, characterized by shared awareness and understanding, proactive engagement, supportive environments, community building and resilience, and a commitment to continuous learning and improvement. Regarding disaster resiliency, students exhibited strong agreement across psychological, social, cognitive, and adaptability/resourcefulness domains. Significant differences were observed in both preparedness culture and disaster resiliency when grouped by age. However, no significant differences were found when grouped by sex. Analysis by academic year level revealed significant differences in preparedness culture, while both preparedness culture and disaster resiliency varied significantly when grouped by academic program or major. Based on the results, an action plan was proposed to enhance the culture of preparedness and disaster resiliency among vocational college students. Read More

Abstract: As a key green infrastructure for urban storm water management, the life cycle environmental impact assessment of sponge facilities is crucial for optimal design and sustainable decision-making. This study systematically examines the methodological steps, software tools, and their comparative advantages in conducting life cycle assessment for sponge facilities. Furthermore, a framework for establishing a life cycle assessment model tailored to sponge facilities is proposed. This research provides methodological support for the precise environmental assessment of sponge facilities and low-carbon urban planning, and promotes the sustainable development of green infrastructure. Read More

Abstract: The ArcSWAT model provides an effective tool for quantifying the responses of gully runoff in Yan'an City to land use and climate change. Returning farmland to forest and reclaiming land from gullies have significantly reduced soil erosion through vegetation restoration and engineering measures. However, climate change may offset some of the ecological benefits. The vegetation index of Yan'an City from 2000 to 2019 ranged from 0.54 to 0.75. In terms of time distribution, it showed a significant upward trend, with an overall upward rate of 0.095/(10a). From 2000 to 2019, 79.83% of the regional vegetation in Yan'an City showed an improving trend, mainly distributed in the loess ridges and gully areas in the north and east of Yan'an City. The degraded areas accounted for 0.34% of Yan'an City, mainly distributed in the urban area of Yan'an City and the suburban areas of county-level cities, presenting a point-like and strip-like distribution. From 2000 to 2012, human activities were the dominant factor determining the status of vegetation index. From 2013 to 2019, the main factors affecting the growth of vegetation in Yan'an were water and heat conditions. In the future, strategies for land use optimization, engineering maintenance and climate adaptability need to be comprehensively considered to achieve the coordinated goal of ecological protection and sustainable utilization of water resources. Read More

Abstract: It is of important significance for the stability of rock engineering to research the non-linear characteristic of rock creep under high stress. The shear creep behavior experimental of slate with hard structural plane were done by using CSS-283 two-way universal testing machine, to analysis on the variation law of creep parameters with stress and time, and obtained the nonsteady parameters creep equation. By the comparison with the theory calculated results of the stationary and non-stationary models and the test results, the non-stationary viscoelastic rheological model is the more exactly reflect the rock viscoelastic deforming performance than the stationary viscoelastic rheological models. Read More