Abstract: The adsorption of CO2 changes the pore content in coal. After CO2 adsorption, pore content in coal shows a trend of first increasing, then decreasing and then increasing. CO2 adsorption pressure, CO2 adsorption time and CO2-H2O slightly change the variation range of pore size, but the trend remains unchanged. For example, in the case of CO2 adsorption for 72 hours, the pore content of 2~10nm and >700nm is generally increased, and the pore content of 10~700nm is significantly reduced. In the case of 144 hours of CO2 adsorption, the pore content of 2~20nm and >700nm generally increased, and the pore content of 20~700nm significantly decreased. When water +CO2 was adsorbed for 144 hours, the pore content of 2~12nm and >700nm generally increased, and the pore content of 12~700nm generally decreased. The coal samples show a certain lag of mercury removal before and after CO2, which indicates that there are some ineffective pores in the coal. The mercury removal efficiency of the coal sample after CO2 adsorption is generally lower than that of the dry sample, indicating that a large number of inefficiently connected pores are generated after CO2 adsorption. That is, CO2 does increase a large number of pores in coal, but the pores are mainly non-connected pores, that is, CO2 has a weak improvement in the connectivity of the pores in coal Read More

Abstract: Most of the coal seams in China are geologically old, well closed, with high gas content and high pressure, which are prone to coal and gas protrusion accidents. Coal mine gas extraction technology has been developed for a long period of time, and some extraction pressurization technologies have appeared in improving the effect of gas extraction. And in the research process of low permeability coal seam pressurization technology, hydraulic pressurization technology is gradually applied. In order to solve the problems encountered in the actual production, the development trend of gas extraction technology will be the up-and-down joint extraction, “three-area linkage” three-dimensional extraction, and coal and gas co-mining technology. However, there are some problems in gas extraction, such as theoretical research, extraction technology and popularization and application of technology and equipment, etc., and the research directions are also various Read More

Abstract: In order to reveal the spatial and temporal distribution characteristics of nitrogen and its influencing factors in a reservoir in Henan Province, a study on the changing characteristics of nitrogen in the water body was carried out in the fall of 2019 and the summer and fall of 2020 to identify the main sources of pollution in the water body in the reservoir area. The results showed that the total nitrogen concentration in the water body ranged from 1.65 to 3.53 mg/L, which exceeded the eutrophication threshold of the water body. Among them, the nitrogen component was dominated by nitrate nitrogen, which accounted for 62.63% of the total nitrogen, mainly from runoff pollution and endogenous release. On a seasonal scale, nitrogen concentrations exhibited higher concentrations in the fall than in the summer. At the spatial scale, total nitrogen, nitrate nitrogen and organic nitrogen concentrations showed similar trends, with a gradual decrease from the upstream to the front of the dam, and an increase after the dam, which was related to the dilution of the water body and the effect of the reservoir's water storage on sand retention. Principal component analysis showed that the key factors affecting water quality in the reservoir were pH, water temperature and ammonia. Pearson correlation analysis showed that the spatial and temporal characteristics of reservoir nitrogen were related to environmental factors, material transport transformations and anthropogenic influences. Read More

Abstract: This study aims to compare the impact of different farming practices on the productivity and morphological characteristics of repeatedly cultivated soybeans. Through systematic field surveys and data analysis, we contrasted the effects of various agricultural cultivation practices on soybean cultivation. The results indicate significant differences in soybean productivity and morphological characteristics among different farming practices, providing insights for optimizing cultivation methods. This study contributes to improving the efficiency and yield of soybean cultivation, offering valuable insights for agricultural production. Read More

Abstract: As a fracturing medium with excellent properties, liquid nitrogen has multiple fracturing effects on coal, and its potential application in coalbed methane mining has become a hot spot in current research. In this paper, the key scientific problems of fracturing and penetration enhancement by liquid nitrogen in low-permeability coals are discussed in depth, and the pore fracturing process and its fracturing mechanism of low-temperature fracturing coal are analyzed. It is found that the ultra-low-temperature fluid fracturing process has the effect of high-energy fluid fracturing to break the rock, and also has the coupled fracturing effect of low-temperature fracturing and phase-change fracturing to increase the energy-driven replacement. It aims to provide theoretical basis and technical support for the efficient and environmentally friendly exploitation of low-permeability oil and gas fields. Read More

Abstract: The pick vibration model was established and analyzed, and discussed the influence of vibration at different frequencies on the cutting load. Then a discrete element model of the interface coal seam is established in EDEM to analyze the change of cut load at different vibration frequencies. The conclusion shows that it is more suitable to apply high frequency vibration when the coal seam content is high, and it is more suitable to apply low frequency vibration when the rock layer content is more. Read More

Abstract: As an important part of modern environmental protection, wildlife protection and reserve management are of great significance to maintain the ecological balance and biodiversity of the earth. In today 's increasingly serious global environmental problems, especially climate change, habitat destruction, and species extinction, wildlife and its habitat protection have become a hot issue of concern to the international community. Governments, non-governmental organizations and the community to actively participate in, and actively promote the protection of the ecological environment for future generations to create a good ecological environment. Read More

Abstract: Fault system is the oil and gas reservoir is one of the main control factors of characteristic changes especially, for dense reservoirs, so it is very important for quality reservoir prediction. However, due to the complex relationship and contradiction between the genesis and scale problems of small faults and the characteristics and resolution of seismic response, the seismic detection technology of small fault development zones is one of the current research hotspots. Seismic attribute analysis is one of the effective means for small fault identification and prediction. Various types of seismic attributes can be obtained by doing different mathematical and physical transformations on seismic data, and various different kinds of seismic attributes can be obtained based on seismic data. Different seismic attributes can describe different geological features, and a single seismic attribute has good ability to identify faults, but a single seismic attribute to predict reservoir The single seismic attribute has good ability to identify faults, but the single seismic attribute may have multiple solutions when predicting reservoir parameters. Therefore, by preferring multiple attributes that can reflect the reservoir characteristics in the work area for analysis, multiple solutions can be reduced and the prediction accuracy can be improved, which is very practical in fault prediction. Read More

Abstract: The spatial scale of coal mining and rock layer control is distributed between 10-10 and 107, spanning 17 orders of magnitude. There are multi-scale pore cracks from millimeter to micro and nanometers in the coal, and the pore size can reach one million times, which makes the coal permeability also show a multi-scale characteristics of millions and time. For the permeability of the coal seam, it is necessary to test and analyze the distribution of micro and nano pores and cracks in the coal [1]. CBM mining is accompanied by the dynamic change of adsorption pressure in coal and the complex deformation of multi-scale heterogeneous structure of coal, and the multi-scale deformation feature of pore fissure structure plays an important role in the transport of methane [2]. However, existing studies focus on treating coal as a homogeneous isotropic medium, without considering the influence of coal multiscale pore structure on permeability. The variation of heterogeneous degree of coal structure with structural scale and its influence on dynamic diffusion and permeability are rarely reported. Li Zhiqiang et al. [3] conducted an experimental-model-mechanism study of CBM gas micro-nano series multi-scale dynamic diffusion permeability. On this basis, the dynamic diffusion and permeability of different coal scales. Read More

Abstract: Urban environments are complex ecosystems where buildings, spaces, and human activities intertwine to influence the local climate, giving rise to what is known as the urban microclimate. This microclimate encompasses variations in temperature, humidity, wind patterns, and precipitation that occur in urban areas compared to their rural counterparts. These variations are not trivial; they significantly affect energy consumption, human comfort, and health, making the study of urban microclimates an essential aspect of sustainable urban planning [81]. The interplay between residential architecture and microclimatic conditions is a critical facet of urban environmental research. As cities grow, the configuration of built environments can significantly affect thermal comfort, air quality, and energy consumption, thereby dictating the liveability and sustainability of urban spaces. This study explores how specific residential layouts—row, diagonal, staggered gable, and enclosed—each manipulate air flow, sunlight exposure, and heat retention differently, contributing to varied microclimatic outcomes within urban neighborhoods. Read More

Abstract: This paper studies the current situation of the development of green highways, analyzes the stages of the whole life cycle of green highways, and puts forward various evaluation indicators in the three stages of design, construction, operation and maintenance, which has certain reference value for the research of the evaluation system of green highways. Read More

Abstract: Based on the population, economic development level, urbanization rate, industrial structure, energy intensity, government expenditure, and foreign trade of Sichuan Province from 2000 to 2020, an improved STIRPAT model is constructed. Ridge regression estimation method is employed to analyze the relationship between carbon emissions and various influencing factors. The research findings indicate that there is a positive correlation between economic development level, urbanization rate, industrial structure, government expenditure, and foreign trade, and carbon emissions in Sichuan Province, but the degree of influence varies for each factor. Among them, industrial structure, namely the proportion of secondary industry, has the greatest impact, while energy intensity shows a negative correlation with carbon emissions. Finally, considering the above analysis, measures for emissions reduction such as fostering a clean and low-carbon industrial system and promoting technological innovation in the low-carbon sector are proposed. Read More

Abstract: Shanxi cave dwellings are a unique habitat and cultural treasure of the Chinese nation, embodying the wisdom and life imprints of the people of the Loess Plateau. With ancient origins rooted in cave dwelling civilizations, Shanxi cave dwellings have evolved over millennia, gradually forming distinctive architectural styles and ways of life. These dwellings are not only the homes of Shanxi farmers but also the cradle of rich and diverse folk cultures deeply intertwined with the literary and artistic heritage of Shanxi. At the same time, their layout and structure reflect the social stratification and family concepts of the local society. With the onset of modernization, the impact of urbanization and new residential trends has posed unprecedented challenges to cave dwelling culture. To safeguard this precious intangible cultural heritage, both central and local governments have introduced a series of protection policies and implemented practical actions. More importantly, it is necessary to vigorously promote innovation and inheritance on the basis of protection, integrating cave dwelling elements into modern design, promoting cultural tourism experiences, and developing cultural and creative industries. This will revitalize this ancient and unique human habitat civilization in contemporary society, continuing the cultural confidence and national spirit of the Shanxi people. Read More

Abstract: China is facing increasing water scarcity, especially in the counties of the North China Plain. Water is mainly used for agricultural, industrial and domestic purposes. China's rapid economic and population growth in recent years has exacerbated water stress. Long-term mismanagement of water resources is also a major cause of water scarcity. Most of China's surface water is recharged by rainfall. Since the rainfall in water-stressed areas is always unstable, the spatial distribution of water resources is uneven. Thus, we can learn that county water deficits across the year are caused by climate change. This paper aims to assess the water risk due to water scarcity and the State of China's water scarcity strategy. Read More