Log in

Relevant bibliographies by topics / Coal Nitrogen content China / Journal articles

To see the other types of publications on this topic, follow the link: Coal Nitrogen content China.

Journal articles on the topic 'Coal Nitrogen content China'

Author: Grafiati

Published: 10 December 2022

Last updated: 31 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Coal Nitrogen content China.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Liu, Dongna, Qi Zhang, Fenghua Zhao, Xile Liu, and Shangqing Zhang. "The Occurrence and Distribution of Nitrogen in Coal of Different Ranks and Densities." Minerals 14, no. 6 (2024): 549. http://dx.doi.org/10.3390/min14060549.

Full text

Abstract:

Nitrogen is one of the significant pollutants emitted from coal combustion, and the study of its distribution and occurrence is very important for the efficient and clean utilization of coal resources. Four kinds of coal with different metamorphic ranks from major coal-producing provinces of China were studied. A gravity float-and-sink experiment was applied to obtain coal samples with different densities from Shanxi Province. The microscope optical method, Kjeldahl method, and X-ray photoelectron spectroscopy (XPS) were used to assess the occurrence, form, and distribution of nitrogen in the

APA, Harvard, Vancouver, ISO, and other styles

2

Wang, Xiao Mei, Yang Quan Jiao, Xiao Ming Wang, Li Qun Wu, Lei Qiao, and Hui Li Xie. "The Concentration of Environmentally Important Trace Elements in Permian Coals in Xinan Coalfield, Henan, China." Advanced Materials Research 807-809 (September 2013): 2215–19. http://dx.doi.org/10.4028/www.scientific.net/amr.807-809.2215.

Full text

Abstract:

The concentration of fourteen environmentally important trace elements (Be, V, Cr, Co, Ni, Cu, Zn, Mo, Sn, Ba, Tl, Pb, Th and U) was studied in thirteen coal samples from Xinan coalfield, Henan province. In addition, virtrinite reflectance analysis, proximate analysis and elemental analysis were also conducted on these samples. The vitrinite reflectance values (Ro) ranges from 2% to 2.35%, revealing that these samples are lean coal. The coals have low moisture content, with Madvalue ranging from 0.57 to 0.95%. The ash and volatile matter content vary between 8.11-22.61% and 10.36-14.64%, respe

APA, Harvard, Vancouver, ISO, and other styles

3

Xu, Yanfei, Shikai An, Yongchun Chen, Chao Yuan, and Pengfei Tao. "Effect of Biomass Improvement Method on Reclaimed Soil of Mining Wasteland." Advances in Civil Engineering 2022 (May 2, 2022): 1–10. http://dx.doi.org/10.1155/2022/8375918.

Full text

Abstract:

Aiming at the problem of soil improvement for mining wasteland reclamation, this article takes the coal mining subsidence reclamation area of a coal mine in the east of China as the research object. Compost improvement and green manure improvement experiments were carried out to study the impact of different biomass improvement methods on the quality of reclaimed soil. 10 soil physical and chemical indicators including water content, total nitrogen, ammonia nitrogen, nitrate nitrogen, available phosphorus, available potassium, total phosphorus, organic matter, pH, and conductivity were selecte

APA, Harvard, Vancouver, ISO, and other styles

4

Xu, Hongjie, Shuxun Sang, Jingfen Yang, et al. "Evaluation of coal and shale reservoir in Permian coal-bearing strata for development potential: A case study from well LC-1# in the northern Guizhou, China." Energy Exploration & Exploitation 37, no. 1 (2018): 194–218. http://dx.doi.org/10.1177/0144598718807553.

Full text

Abstract:

Indentifying reservoir characteristics of coals and their associated shales is very important in understanding the co-exploration and co-production potential of unconventional gases in Guizhou, China. Accordingly, comprehensive experimental results of 12 core samples from well LC-1# in the northern Guizhou were used and analyzed in this paper to better understand their vertical reservoir study. Coal and coal measured shale, in Longtan Formation, are rich in organic matter, with postmature stage of approximately 3.5% and shales of type III kerogen with dry gas generation. All-scale pore size an

APA, Harvard, Vancouver, ISO, and other styles

5

Jia, Jinzhang, Yinghuan Xing, Bin Li, et al. "Study on the Occurrence Difference of Functional Groups in Coals with Different Metamorphic Degrees." Molecules 28, no. 5 (2023): 2264. http://dx.doi.org/10.3390/molecules28052264.

Full text

Abstract:

In order to quantitatively study the difference in occurrence content of functional groups in coals with different metamorphic degrees, the samples of long flame coal, coking coal, and anthracite of three different coal ranks were characterized by FTIR and the relative content of various functional groups in different coal ranks was obtained. The semi-quantitative structural parameters were calculated, and the evolution law of the chemical structure of the coal body was given. The results show that with the increase in the metamorphic degree, the substitution degree of hydrogen atoms on the be

APA, Harvard, Vancouver, ISO, and other styles

6

Ruan, Mengying, Yuxiu Zhang, and Tuanyao Chai. "Rhizosphere Soil Microbial Properties on Tetraena mongolica in the Arid and Semi-Arid Regions, China." International Journal of Environmental Research and Public Health 17, no. 14 (2020): 5142. http://dx.doi.org/10.3390/ijerph17145142.

Full text

Abstract:

Tetraena mongolica is a rare and endangered species unique to China. The total number and density of Tetraena mongolica shrubs in desertification areas have experienced a sharp decrease with increases in coal mining activities. However, available information on the T. mongolica rhizosphere soil quality and microbial properties is scarce. Here, we investigated the effect of coal mining on the soil bacterial community and its response to the soil environment in the T. mongolica region. The results showed that the closer to the coal mining area, the lower the vegetation coverage and species diver

APA, Harvard, Vancouver, ISO, and other styles

7

Yang, Dejun, Yajun Zhang, and Xiuqin Chen. "EFFECT OF COAL MINING ON SOIL NITROGEN DISTRIBUTION IN SEMI-ARID MINING AREA OF WESTERN CHINA." Journal of Environmental Engineering and Landscape Management 27, no. 3 (2019): 163–73. http://dx.doi.org/10.3846/jeelm.2019.10795.

Full text

Abstract:

Soil nitrogen is a key indicator of soil quality and plays a significant role for plant growth. Therefore, it is very important to study soil nitrogen distribution, especially in semi-arid area of western China. Fewer scholars paid attention to the effect on soil nitrogen due to coal mining in semi-arid mining areas of western China. In this paper, soil samples of different locations were tested in both the loess region and the aeolian sand region in the Daliuta mining area in Shaanxi Province. The impacts of mining subsidence on soil nitrogen were investigated. The soil nitrogen distributions

APA, Harvard, Vancouver, ISO, and other styles

8

Ma, Kang, Yuxiu Zhang, Mengying Ruan, Jing Guo, and Tuanyao Chai. "Land Subsidence in a Coal Mining Area Reduced Soil Fertility and Led to Soil Degradation in Arid and Semi-Arid Regions." International Journal of Environmental Research and Public Health 16, no. 20 (2019): 3929. http://dx.doi.org/10.3390/ijerph16203929.

Full text

Abstract:

Underground coal mining in western China causes heavy land subsidence and alters the soil ecology. However, the effects of land subsidence on soil fertility are not currently known, and the key factors governing its impact remain unclear in sandy land. We investigated the effects of land subsidence induced by underground mining on the soil quality in western China. Soil samples were collected at 0–15 cm and 15–30 cm from control and subsidence areas in three coal mines. The results showed that the soil water content (SWC), clay and silt percentage, total nitrogen (TN), dissolved organic carbon

APA, Harvard, Vancouver, ISO, and other styles

9

Lin, Haifei, Yang Bai, Jingting Bu, et al. "Comprehensive Fractal Model and Pore Structural Features of Medium- and Low-Rank Coal from the Zhunnan Coalfield of Xinjiang, China." Energies 13, no. 1 (2019): 7. http://dx.doi.org/10.3390/en13010007.

Full text

Abstract:

Medium and low-rank coal from the Zhunnan coalfield of Xinjiang in China was investigated for quantitatively characterizing its range of aperture structure. The pore parameters were determined by nitrogen adsorption at low temperature and mercury injection at high pressure, and the full aperture was determined. The FHH model, Menger model, Sierpinski model, and a thermodynamic model were used to calculate the comprehensive fractal dimension of the coal samples over the full range of aperture. The fractal characteristics of the pores of medium- and low-rank coal were quantitatively analyzed, wh

APA, Harvard, Vancouver, ISO, and other styles

10

Ding, Lili, and Qiang Zeng. "Study on Characteristics of Coal Spontaneous Combustion in Kerjian Mining Area, Xinjiang, China." Minerals 12, no. 12 (2022): 1508. http://dx.doi.org/10.3390/min12121508.

Full text

Abstract:

The spontaneous combustion of coal is a disaster associated with coal mining. In this study, the authors investigated the characteristics of spontaneous combustion of coal at different temperatures (room temperature, 50–500 °C with 50 °C interval) using Fourier transform infrared spectroscopy (FTIR), high-resolution transmission electron microscopy (HRTEM), etc. The results showed the aromatic structure was mainly naphthalene. The aliphatic hydrocarbons were long chain. Oxygen, nitrogen, and sulphur existed as C-O, pyridine, pyrrole nitrogen, aliphatic sulphur, and sulfone. The molecular struc

APA, Harvard, Vancouver, ISO, and other styles

11

Sakai, Yuji, Masataka Nakamura, and Chang Wang. "Soil Carbon Sequestration Due to Salt-Affected Soil Amelioration with Coal Bio-Briquette Ash: A Case Study in Northeast China." Minerals 10, no. 11 (2020): 1019. http://dx.doi.org/10.3390/min10111019.

Full text

Abstract:

Increasing soil carbon storage and biomass utilization is an effective process for mitigating global warming. Coal bio-briquettes (CBB) are made using two low-ranked coals with high sulfur content, corn stalks, and calcium hydroxide, and the combustion ash can ameliorate the physicochemical properties in salt-affected soil. CBB ash contains mainly calcium compounds, such as calcium sulfate, calcium hydroxide, and calcium carbonate, and coal fly ash and biomass ash. In this paper, changes in soil carbon and nitrogen content through salt-affected soil amelioration during 5 months using two CBB a

APA, Harvard, Vancouver, ISO, and other styles

12

Yang, Xin, Gongda Wang, Mingqi Ni, Longyong Shu, Haoran Gong, and Zhie Wang. "Investigation on Key Parameters of N2 Injection to Enhance Coal Seam Gas Drainage (N2-ECGD)." Energies 15, no. 14 (2022): 5064. http://dx.doi.org/10.3390/en15145064.

Full text

Abstract:

Practice shows that CO2/N2-ECBM is an effective technology to enhance coalbed methane. However, there are few field tests in which the technology is applied to enhance the gas drainage in underground coal mines, and the effect is uncertain. In this study, firstly, the reasons for the decrease of gas drainage efficiency in the exhaustion period were analyzed based on the theory of fluid mechanics. Secondly, the mechanism of N2 injection to enhance coal seam gas drainage (N2-ECGD) was discussed: with the gradual decrease of gas pressure in the drainage process, coal seam gas enters a low-pressur

APA, Harvard, Vancouver, ISO, and other styles

13

Yi, Qitao, Xiaomeng Wang, Tingting Wang, Xijie Qu, and Kai Xie. "Eutrophication and nutrient limitation in the aquatic zones around Huainan coal mine subsidence areas, Anhui, China." Water Science and Technology 70, no. 5 (2014): 878–87. http://dx.doi.org/10.2166/wst.2014.293.

Full text

Abstract:

The eutrophication of three small lakes in the aquatic zones at the Huainan coal mine subsidence areas, designated as east site (ES), central site (CS), and west site (WS), were studied. Nutrient content, species, and nitrogen (N) to phosphorus (P) ratios were obtained through water quality analyses. Nutrient limitation was evaluated by nutrient enrichment bioassays (NEBs) in the autumn of 2012 and spring of 2013. Average annual concentrations of total phosphorus (TP) were 0.05, 0.08, and 0.10 mg/L, and total nitrogen (TN) concentrations were 0.77, 1.95, and 2.06 mg/L in the water column at CS

APA, Harvard, Vancouver, ISO, and other styles

14

Park, Minhan, Yujue Wang, Jihyo Chong, et al. "Simultaneous Measurements of Chemical Compositions of Fine Particles during Winter Haze Period in Urban Sites in China and Korea." Atmosphere 11, no. 3 (2020): 292. http://dx.doi.org/10.3390/atmos11030292.

Full text

Abstract:

We performed simultaneous measurements of chemical compositions of fine particles in Beijing, China and Gwangju, Korea to better understand their sources during winter haze period. We identified PM2.5 events in Beijing, possibly caused by a combination of multiple primary combustion sources (biomass burning, coal burning, and vehicle emissions) and secondary aerosol formation under stagnant conditions and/or dust sources under high wind speeds. During the PM2.5 events in Gwangju, the contribution of biomass burning and secondary formation of nitrate and organics to the fine particles content s

APA, Harvard, Vancouver, ISO, and other styles

15

Yuan, Yuan, Yue Tang, Lihua Tong, Daiyong Cao, Yingchun Wei, and Caiqin Bi. "Porosity Characteristics of Coal Seams and the Control Mechanisms of Coal Petrology in the Xishanyao Formation in the Western Part of the Southern Junggar Basin." Minerals 14, no. 6 (2024): 543. http://dx.doi.org/10.3390/min14060543.

Full text

Abstract:

The porosity characteristics of coal seams serve as a pivotal factor in assessing the development potential of coalbed methane (CBM) resources, significantly influencing the adsorption and permeability capabilities of coal reservoirs, as well as the accumulation, entrapment, and preservation of CBM. In this study, we focused on the coal seams of the Xishanyao Formation in the western part of the southern Junggar Basin (NW China). By leveraging the complementarity of nuclear magnetic resonance (NMR), low-temperature liquid nitrogen experiments, and high-pressure mercury intrusion porosimetry (M

APA, Harvard, Vancouver, ISO, and other styles

16

Xu, Zhi, Ming Li, Yu Xu, and Luwei Sun. "Fractal Characteristics and Its Controlling Factors of Nanopore of Coal from Shanxi Province, North China." Journal of Nanoscience and Nanotechnology 21, no. 1 (2021): 727–40. http://dx.doi.org/10.1166/jnn.2021.18515.

Full text

Abstract:

Much attention has been recently paid to the Carboniferous-Permian coal-bearing strata in Shanxi Province, now the largest producing coalbed methane field in China. In this study, a comprehensive approach of mercury injection, low-temperature liquid nitrogen adsorption, and permeability experiments was adopted to investigate the structure and fractal characteristics of nanopores in the Carboniferous-Permian coal (with 0.77%˜3.04% Ro,ran). Based on the fractal model, two fractal dimensions D1 and D2 corresponding to diffusion pore (<65 nm) and seepage pore (pore size ≥65 nm), respectively, w

APA, Harvard, Vancouver, ISO, and other styles

17

Xu, Ruiping, Junying Li, Xinju Li, Jinning Zhang, and Wen Song. "Effect of Coal Mining Subsidence on Soil Enzyme Activity in Mining Areas with High Underground Water Levels." Water 16, no. 12 (2024): 1704. http://dx.doi.org/10.3390/w16121704.

Full text

Abstract:

In order to investigate the changes in soil enzyme activity and their influencing factors in coal mining subsidence areas with high underground water levels, in this study, we collected soil samples at different depths (SL: 0–20 cm; ML: 20–40 cm; DL: 40–60 cm) in a deep coal seam subsidence area (T1), a shallow coal seam subsidence area (T2), and control non-subsidence areas (W1 and W2) in eastern China. Soil physicochemical properties and enzyme activities were determined, and the mechanism of the latter’s response to coal mining subsidence was investigated based on correlation analysis, redu

APA, Harvard, Vancouver, ISO, and other styles

18

Chen, Hao, Wenguang Tian, Zhenhong Chen, Qingfeng Zhang, and Shu Tao. "Genesis of Coalbed Methane and Its Storage and Seepage Space in Baode Block, Eastern Ordos Basin." Energies 15, no. 1 (2021): 81. http://dx.doi.org/10.3390/en15010081.

Full text

Abstract:

The Baode block on the eastern margin of the Ordos Basin is a key area for the development of low-rank coalbed methane (CBM) in China. In order to find out the genesis of CBM and its storage and seepage space in Baode block, the isotopic testing of gas samples was carried out to reveal the origin of CH4 and CO2, as well, mercury intrusion porosimetry, low temperature nitrogen adsorption, and X-ray CT tests were performed to characterize the pores and fractures in No. 4 + 5 and No. 8 + 9 coal seams. The results showed that the average volume fraction of CH4, N2, and CO2 is 88.31%, 4.73%, and 6.

APA, Harvard, Vancouver, ISO, and other styles

19

Zhu, Hongfen, Ruipeng Sun, Zhanjun Xu, Chunjuan Lv, and Rutian Bi. "Prediction of Soil Nutrients Based on Topographic Factors and Remote Sensing Index in a Coal Mining Area, China." Sustainability 12, no. 4 (2020): 1626. http://dx.doi.org/10.3390/su12041626.

Full text

Abstract:

(1) Background: Coal mining operations caused severe land subsidence and altered the distributions of soil nutrients that influenced by multiple environmental factors at different scales. However, the prediction performances for soil nutrients based on their scale-specific relationships with influencing factors remains undefined in the coal mining area. The objective of this study was to establish prediction models of soil nutrients based on their scale-specific relationships with influencing factors in a coal mining area. (2) Methods: Soil samples were collected based on a 1 × 1 km regular gr

APA, Harvard, Vancouver, ISO, and other styles

20

Huang, Hai, Jing Guo, and Yuxiu Zhang. "The Response of Arbuscular Mycorrhizal Fungal Communities to the Soil Environment of Underground Mining Subsidence Area in Northwest China." International Journal of Environmental Research and Public Health 17, no. 24 (2020): 9157. http://dx.doi.org/10.3390/ijerph17249157.

Full text

Abstract:

Fully mechanized mining technology applied over a very large working face is typically utilized for coal exploitation in Northwest China and triggered two types of land subsidence above the goaf edge and center. However, the effects of mining subsidence on arbuscular mycorrhizal fungal (AMF) communities are still unknown. Here, we investigated the soil physicochemical properties and the response of AMF communities to the soil environment at the margin and center of the subsidence area of the same working face. Our results showed the soil water content, nutrient content and enzyme activity were

APA, Harvard, Vancouver, ISO, and other styles

21

Zheng, Qiming, Qinfu Liu, Bo Huang, and Weilong Zhao. "Isotopic composition and content of organic nitrogen in the coals of Qinshui Coalfield, North China." Journal of Geochemical Exploration 149 (February 2015): 120–26. http://dx.doi.org/10.1016/j.gexplo.2014.12.002.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Zhang, Jiali, Yinghong Liu, Meilan Wen, et al. "Distribution Characteristics and Ecological Risk Assessment of Nitrogen, Phosphorus, and Some Heavy Metals in the Sediments of Yueliang Lake in Western Jilin Province, Northeast China." Water 14, no. 20 (2022): 3306. http://dx.doi.org/10.3390/w14203306.

Full text

Abstract:

This study seeks to clarify the content characteristics, spatial distribution, potential sources and ecological risks of nitrogen, phosphorus and some heavy metals (As, Hg, Cd, Cr, Cu, Pb, Zn and Ni) in the sediments of Yueliang Lake. Nitrogen, phosphorus and heavy metals were analyzed in the surface and core sediments of Yueliang Lake. The present situation of heavy metal pollution and the degree of potential ecological risk in sediments was evaluated by the geo-accumulation index (Igeo) and potential ecological risk index (RI). The correlation (CA) and principal component analysis (PCA) meth

APA, Harvard, Vancouver, ISO, and other styles

23

Gao, Yakun, Yinli Bi, Shaopeng Ma, et al. "Yields of Buckwheat and Alfalfa in an Intercropping System Inoculated with Dark Septate Endophytes in a Coal Mining Subsidence Dryland Area." Agronomy 12, no. 11 (2022): 2860. http://dx.doi.org/10.3390/agronomy12112860.

Full text

Abstract:

Coal mining subsidence areas in north Shaanxi province in north China are commonly low-fertility drylands, and intercropping is a popular method locally of maximizing crop yields. Inoculation with dark septate endophytes (DSE) can increase the yields of conventional crops grown in monoculture, but the effects of DSE on the growth and yield of intercropped plants are unknown. Here, a field experiment was conducted in a coal mining subsidence area on the loess plateau in 2020 and 2021. The two crops were buckwheat and alfalfa, with four treatments for each crop: sole cropping control, sole cropp

APA, Harvard, Vancouver, ISO, and other styles

24

Gao, Hai-Tao, Yan-Ming Zhu, Fu-Hua Shang, and Chong-Yu Chen. "Study on the Shale Gas Reservoir-Forming Characteristics of the Taiyuan Formation in the Eastern Qinshui Basin, China." Journal of Nanoscience and Nanotechnology 21, no. 1 (2021): 72–84. http://dx.doi.org/10.1166/jnn.2021.18465.

Full text

Abstract:

Shales are widely developed in the strata of the Carboniferous-Permian coal measures in the Qinshui Basin, and these shales have great potential for shale gas exploration. In this paper, the shales of the Taiyuan Formation in the eastern Qinshui Basin are studied. The shales of the Taiyuan Formation in the study area are investigated through field investigation, organic geochemical testing, X-ray diffraction, scanning electron microscopy, high pressure mercury injection, low temperature liquid nitrogen adsorption and PetroMod simulation and through other tests to study the reservoir characteri

APA, Harvard, Vancouver, ISO, and other styles

25

Guo, Yinhua, Wei Liu, Lixiong Zeng, et al. "A Phytoremediation Efficiency Assessment of Cadmium (Cd)-Contaminated Soils in the Three Gorges Reservoir Area, China." Plants 14, no. 14 (2025): 2202. https://doi.org/10.3390/plants14142202.

Full text

Abstract:

To investigate the remediation efficiency of different plant species on cadmium (Cd)-contaminated soil, this study conducted a pot experiment with two woody species (Populu adenopoda and Salix babylonica) and two herbaceous species (Artemisia argyi and Amaranthus hypochondriacus). Soils were collected from an abandoned coal mine and adjacent pristine natural areas within the dam-adjacent section of the Three Gorges Reservoir Area to establish three soil treatment groups: unpolluted soil (T1, 0.18 mg·kg−1 Cd), a 1:1 mixture of contaminated and unpolluted soil (T2, 0.35 mg·kg−1 Cd), and contamin

APA, Harvard, Vancouver, ISO, and other styles

26

Sun, Wei, Xiaodong Hu, Yuzhen Fu, et al. "Different formation pathways of nitrogen-containing organic compounds in aerosols and fog water in northern China." Atmospheric Chemistry and Physics 24, no. 12 (2024): 6987–99. http://dx.doi.org/10.5194/acp-24-6987-2024.

Full text

Abstract:

Abstract. While aqueous-phase processing is known to contribute to the formation of nitrogen-containing organic compounds (NOCs), the specific pathways involved remain poorly understood. In this study, we aimed to characterize the NOCs present in both pre-fog aerosols and fog water collected at a suburban site in northern China. Fourier-transform ion cyclotron resonance mass spectrometry was utilized to analyze the molecular composition of NOCs in both negative and positive modes of electrospray ionization (ESI− and ESI+). In both pre-fog aerosols and fog water samples, NOCs constituted a sign

APA, Harvard, Vancouver, ISO, and other styles

27

Xu, Shen, Meng Wang, Jie Gao, et al. "Characteristics of Coal-Bearing Shale Reservoirs and Gas Content Features in the Carboniferous–Permian System of the Qinshui Basin, Shanxi Province, China." Energies 18, no. 5 (2025): 1120. https://doi.org/10.3390/en18051120.

Full text

Abstract:

The evaluation of reservoir properties and gas-bearing characteristics is critical for assessing shale gas accumulation. This study aimed to improve the precision of characterizing the properties and gas-bearing features of the Carboniferous and Permian shale reservoirs within the Qinshui Basin, Shanxi Province, China. It specifically focuses on the shale from the Late Carboniferous to Early Permian Shanxi and Taiyuan formations at Well Z1, located in the mid-eastern region of the basin. A comprehensive suite of analytical techniques, including organic geochemical analysis, scanning electron m

APA, Harvard, Vancouver, ISO, and other styles

28

Guo, Yangnan, Junlong Wu, and Yan Yu. "Differential Response of Soil Microbial Community Structure in Coal Mining Areas during Different Ecological Restoration Processes." Processes 10, no. 10 (2022): 2013. http://dx.doi.org/10.3390/pr10102013.

Full text

Abstract:

Micro-organisms play important roles in promoting soil ecosystem restoration, but much of the current research has been limited to changes in microbial community structure in general, and little is known regarding the more sensitive and indicative microbial structures or the responses of microbial diversity to environmental change. In this study, based on high-throughput sequencing and molecular ecological network analyses, the structural characteristics of bacterial communities were investigated in response to four different ecological restoration modes in a coal mining subsidence area locate

APA, Harvard, Vancouver, ISO, and other styles

29

Wu, Zhongming, Weidong Zhu, Haijun Guo, et al. "Effects of Soil Nutrient Restoration Aging and Vegetation Recovery in Open Dumps of Cold and Arid Regions in Xinjiang, China." Land 13, no. 10 (2024): 1690. http://dx.doi.org/10.3390/land13101690.

Full text

Abstract:

Open-pit coal mining inevitably damages the soil and vegetation in mining areas. Currently, the restoration of cold and arid open-pit mines in Xinjiang, China, is still in the initial exploratory stage, especially the changes in soil nutrients in spoil dumps over time. Dynamic remote sensing monitoring of vegetation in mining areas and their correlation are relatively rare. Using the Heishan Open Pit in Xinjiang, China, as a case, soil samples were collected during different discharge periods to analyze the changes in soil nutrients and uncover the restoration mechanisms. Based on four Landsat

APA, Harvard, Vancouver, ISO, and other styles

30

Li, Haiyan, Jing Cheng, Qiang Zhang, et al. "Rapid transition in winter aerosol composition in Beijing from 2014 to 2017: response to clean air actions." Atmospheric Chemistry and Physics 19, no. 17 (2019): 11485–99. http://dx.doi.org/10.5194/acp-19-11485-2019.

Full text

Abstract:

Abstract. The clean air actions implemented by the Chinese government in 2013 have led to significantly improved air quality in Beijing. In this work, we combined the in situ measurements of the chemical components of submicron particles (PM1) in Beijing during the winters of 2014 and 2017 and a regional chemical transport model to investigate the impact of clean air actions on aerosol chemistry and quantify the relative contributions of anthropogenic emissions, meteorological conditions, and regional transport to the changes in aerosol chemical composition from 2014 to 2017. We found that the

APA, Harvard, Vancouver, ISO, and other styles

31

Kewat, Anjali*1 Aayushi Panchal2 Bharat Maitreya3 Solanki Hitesh4. "Assessing the Impact of Coal Characteristics on Thermal Power Plant Efficiency and Pollutant Emissions." International Journal of Scientific Research and Technology 2, no. 4 (2025): 523–25. https://doi.org/10.5281/zenodo.15257811.

Full text

Abstract:

The quality of the coal utilized greatly impacts the efficiency and emissions of power plants. This study looks at how coal quality affects power plant performance, with an emphasis on emissions and efficiency. The analysis shows that power plant efficiency and emissions are influenced by coal quality characteristics, including calorific value, ash content, moisture content, sulfur content, and nitrogen content. The impact of coal quality on emissions of sulfur dioxide, carbon dioxide, nitrogen oxides, and particulate matter is also examined in the study. Strategies for improving coal quality

APA, Harvard, Vancouver, ISO, and other styles

32

Qi, Xiaohan, Shuangrong Hou, Heng Ma, Pin Wang, Yang Liu, and Xiaoqi Wang. "A Study of the Effect of Freeze–Thawing by Liquid Nitrogen on the Mechanical and Seepage Characteristics of Coal with Different Moisture Content Values." Processes 11, no. 6 (2023): 1822. http://dx.doi.org/10.3390/pr11061822.

Full text

Abstract:

In order to study the effect of freezing and thawing of liquid nitrogen on the mechanical and seepage characteristics of coal rock with different water content values, conventional triaxial loading tests on freeze–thawed coal samples with different water content values were carried out using non-contact digital image processing technology. The research results showed that with the same water content, the peak strength of a liquid nitrogen freeze–thawed coal sample was smaller than that of a non-freeze–thawed coal sample, and the Poisson’s ratio was larger than that of the non-freeze–thawed coa

APA, Harvard, Vancouver, ISO, and other styles

33

Beshley, S., V. Baranov, and Y. Shpak. "Effect of coal fly ash and potassium humate on nitrogen and carbon contents in coal industry dump substrate and organs of Sorghum drummondii (Nees ex Steud.) Millsp. & Chase." Visnyk of Lviv University. Biological series, no. 85 (February 25, 2021): 45–52. http://dx.doi.org/10.30970/vlubs.2021.85.05.

Full text

Abstract:

Researched ammonium, nitrite and nitrate nitrogen and organic carbon contents in gray-black unburned rock substrate from coal industry waste rock dump of Central Enrichment Factory (CEF) owned by PJSC “Lviv Coal Company” (Lviv Oblast, Ukraine) and total nitrogen and organic carbon contents in organs of Sorghum drummondii (Nees ex Steud.) Millsp. & Chase under effect of coal fly ash from the Dobrotvir thermal power plant (Lviv Oblast, Ukraine) and potassium humate “ГКВ-45” (made by LLC “PARK”, Lviv Oblast, Ukraine). Found high content of organic carbon and ammonium nitrogen in waste rock du

APA, Harvard, Vancouver, ISO, and other styles

34

Chen, Peiqi, Gang Li, Jie Shao, et al. "Preparation of Nitrogen-Rich Tar by Co-Pyrolysis and Analysis of Nitrogen-Containing Compounds in Pyrolysis Products." Applied Sciences 15, no. 11 (2025): 6284. https://doi.org/10.3390/app15116284.

Full text

Abstract:

In this study, we use coal as a carbon source from Zhangjiamao and doped with different nitrogen sources for co-pyrolysis. Nitrogen-rich tar was successfully prepared, and the content and variety were also increased. From the elemental analysis, the nitrogen content of all the tars was significantly enhanced, among which the nitrogen content of the tars after co-pyrolysis with melamine was enhanced by 5.21%, and the nitrogen content of coke was enhanced by 10.87%. According to the GC/MS results, it was found that the nitrogen compounds in the tar after full pyrolysis were richer and more abund

APA, Harvard, Vancouver, ISO, and other styles

35

Wu, Xin, Xiangying Wang, Huisheng Meng, Jie Zhang, Jamie R. Lead, and Jianping Hong. "Pseudomonas fluorescens with Nitrogen-Fixing Function Facilitates Nitrogen Recovery in Reclaimed Coal Mining Soils." Microorganisms 12, no. 1 (2023): 9. http://dx.doi.org/10.3390/microorganisms12010009.

Full text

Abstract:

Coal mining has caused significant soil nitrogen loss in mining areas, limiting reclamation and reuse in agriculture. This article studies the effects of organic fertilizer, inorganic fertilizer, and the combined application of Pseudomonas fluorescens with the ability of nitrogen fixation on soil nitrogen accumulation and composition in the reclamation area of the Tunlan Coal Mine from 2016 to 2022 under the conditions of equal nitrogen application, providing a scientific basis for microbial fertilization and the rapid increase in nitrogen content in the reclaimed soil of mining areas. The res

APA, Harvard, Vancouver, ISO, and other styles

36

Lian, Jin Jiang, De Tian Yan, Biao Gao, and Hai Yang Cao. "Coal Bed Methane Reservoir in the Mengjin Coalfield, Henan Province, China." Applied Mechanics and Materials 448-453 (October 2013): 1062–65. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.1062.

Full text

Abstract:

Coal is a continuous unconventional gas reservoir and coal bed methane has the potential to make an important contribution to the future energy demands. The second member coal seam of Shaxi Formation in the Mengjin coalfield is one of the most important methane bearing and exploration formations. Based on industrial analysis, elemental analysis and methane content test of thirty-five coal samples from the Mengjin coalfield, together with other geological data of the past five-year exploration, the factors that controlling the coal bed methane reservoir are identified in the Mengjin coalfield.

APA, Harvard, Vancouver, ISO, and other styles

37

Kong, Xianglu, Song Yang, Shoujun Liu, Kaixia Zhang, Tingting Jiao, and Ju Shangguan. "Study on Coupling Effect of Additives on NOx Control in Coal Pyrolysis-Combustion." E3S Web of Conferences 290 (2021): 03029. http://dx.doi.org/10.1051/e3sconf/202129003029.

Full text

Abstract:

A large amount of nitrogen oxides produced by loose coal combustion has an important impact on the ecological environment. To solve this problem, it is proposed to prepare clean coke instead of loose coal combustion to reduce the emission of nitrogen oxides from civil coal combustion. Clean coke is prepared by pyrolysis raw coal adding additives, and the gas generated by pyrolysis is collected uniformly, thus avoiding the emission problem in the process of loose burning. In addition, the clean fuel catalyzes the reduction of nitrogen oxides to produce N2 in the combustion process, thus reducin

APA, Harvard, Vancouver, ISO, and other styles

38

Ouyang, Zheyuan, Haichao Wang, Bin Sun, et al. "Quantitative Prediction of Deep Coalbed Methane Content in Daning-Jixian Block, Ordos Basin, China." Processes 11, no. 11 (2023): 3093. http://dx.doi.org/10.3390/pr11113093.

Full text

Abstract:

The potential of deep coalbed methane resources is substantial. Gas content is an important parameter for resource assessment. At present, the gas content test method commonly used for shallow coal reservoirs is not suitable for determining deep coalbed methane gas content. Therefore, it is urgent to establish a prediction method for deep coalbed methane gas content. This study aims to quantitatively predict the gas content of coalbed methane in deep coal reservoirs and uncover its influencing factors. For this purpose, we selected the Daning-Jixian area, a region in China with relatively adva

APA, Harvard, Vancouver, ISO, and other styles

39

Baolin, Tian, Wang Shijun, Guo Yingting, Li Hongqi, and Chen Guiren. "Flora of Palaeozoic coal balls of China." Journal of Palaeosciences 45 (December 31, 1996): 247–54. http://dx.doi.org/10.54991/jop.1996.1240.

Full text

Abstract:

The geographic distribution of coal balls of China and their stratigraphic range are very wide. Fossil plants in coal balls are abundant Floras of coal balls of Jingyuan Gansu contain the same content as those of the Hauptfloz coal of Ruhr and the Kokfloz coal of Ostrau (Namur C) in Europe. Coal balls of Shanxi and Shandong (P1) are abundant and highly diversified with flourished Cathaysian flora, while in the coal balls of Shuicheng, Guizhou (the top of Upper Permian) the Cathaysian flora somewhat declines and shows less in diversification. Some Mesozoic coloured elements have also been obser

APA, Harvard, Vancouver, ISO, and other styles

40

Wang, Chang’an, Pengqian Wang, Lin Zhao, Yongbo Du, and Defu Che. "Experimental Study on NOx Reduction in Oxy-fuel Combustion Using Synthetic Coals with Pyridinic or Pyrrolic Nitrogen." Applied Sciences 8, no. 12 (2018): 2499. http://dx.doi.org/10.3390/app8122499.

Full text

Abstract:

Oxy-fuel combustion technology can capture carbon dioxide (CO2) in the large-scale and greatly lower nitrogen oxides (NOx) emission in coal-fired power plants. However, the influence of inherent minerals on NOx reduction still remains unclear and the impact of oxy-fuel combustion on the transformation of different nitrogen functional groups has yet to be fully understood. The present work aims to obtain a further understanding of the NOx reduction during oxy-fuel combustion using synthetic coals with pyrrolic or pyridinic nitrogen. Compared to pyridinic nitrogen, more of the pyrrolic nitrogen

APA, Harvard, Vancouver, ISO, and other styles

41

Portola, V. A., A. A. Bobrovnikova, S. A. Sin, and V. G. Igishev. "Special Features of the Release of Indicator Fire Gases at the Nitrogen Supply to the Foci of Coal Spontaneous Combustion." Occupational Safety in Industry, no. 4 (April 2022): 47–52. http://dx.doi.org/10.24000/0409-2961-2022-4-47-52.

Full text

Abstract:

The most common method for monitoring the processes of spontaneous combustion of coal in the mines is the analysis of the composition of the mine atmosphere to detect gases released from coal when the temperature rises. Carbon monoxide and hydrogen are usually used as the main indicators. In recent years, nitrogen is widely used to prevent and extinguish the underground fires. It reduces the oxygen concentration in the fire area and can affect the indicator gases release. To study this effect, the samples of coal with a fraction of 1–3 mm, and the samples of coal dust with a particle size of 0

APA, Harvard, Vancouver, ISO, and other styles

42

Wang, Sheng-Cheng, Ya-Nan Gao, Lan-Ying Huang, Hai-Jian Li, and Shan-Jie Su. "A novel triaxial apparatus to evaluate the effect of high temperature nitrogen injection concept and design." Thermal Science 25, no. 6 Part B (2021): 4527–35. http://dx.doi.org/10.2298/tsci2106527w.

Full text

Abstract:

High temperature nitrogen, injection into coal seams is supposed to improve the per?meability and thus maintain the safety of underground mining. A novel triaxial appa?ratus is recently developed, aiming at providing the effective method to evaluate the effect of high temperature nitrogen injection. The main feature of this novel appara?tus is its high confining pressure, gas injection with high pressure as well as the high temperature. This new device can be either used for natural coal samples (e.g. intact or fractured) or the synthetic coal samples. A series of leakage tests were conducted

APA, Harvard, Vancouver, ISO, and other styles

43

Zhang, Zhiming, Anshuman Satpathy, Kirby Morris, Abhishek RoyChowdhury, Rupali Datta, and Dibyendu Sarkar. "Organic Amendments Improve the Quality of Coal Gob Spoils: A Sustainable Mining Waste Reclamation Method." Applied Sciences 14, no. 21 (2024): 9723. http://dx.doi.org/10.3390/app14219723.

Full text

Abstract:

Coal mine tailings can lead to a range of environmental problems, including toxic metal contamination, soil erosion, acid mine drainage, and increased salinity. Mine spoils from coal mining activities accumulated as gob piles are difficult to reclaim due to constraints such as a steep slope, unsuitable pH, insufficient nutrient supply, metal toxicity, low water-holding capacity, and poor soil structure. We investigated the efficiency of low-cost amendments on coal gob spoils from Carthage Coal Field (CCF) in New Mexico in improving the quality of coal gob spoils. Gob spoil was incubated for 90

APA, Harvard, Vancouver, ISO, and other styles

44

Zhu, Jie, Tangsha Shao, Tianxiang Lan, et al. "Characteristics of Permeability Evolution and Pore Structure of Coal with High Gas." Energies 17, no. 1 (2023): 66. http://dx.doi.org/10.3390/en17010066.

Full text

Abstract:

To study the influence of gas pressure on coal permeability evolution, we conducted experiments on coal samples from the No. 9 coal seam in Tangshan Coal Mine, Hebei Province, China. Different gas pressures (helium and nitrogen) were applied, and nitrogen-induced deformations were measured. We also analyzed the coal samples’ pore structure using mercury injection porosimetry, obtaining pore surface fractal dimensions. The increase in nitrogen pressure from 0.3 MPa to 3 MPa resulted in an elevation of adsorption strain from 0.168 × 10−3 to 1.076 × 10−3, with a gradual decrease observed in the e

APA, Harvard, Vancouver, ISO, and other styles

45

Chang, Lu, Juan Huang, and Haofei Zheng. "The Influence of Electrical Pulses on the Evolution Characteristics of Coal Pore Structur." International Journal of Natural Resources and Environmental Studies 5, no. 3 (2025): 147–56. https://doi.org/10.62051/ijnres.v5n3.16.

Full text

Abstract:

China is rich in coalbed methane resources, comparable to conventional natural gas, with enormous development potential. However, low-permeability and low-pressure coal reservoirs are widespread, leading to generally low single-well production. This paper focuses on the coal samples from Zhangcun, Lu'an, and uses an independently developed high-voltage electric pulse fracturing platform to conduct high-voltage electric pulse fracturing experiments on coal bodies. Mercury pressure and liquid nitrogen adsorption techniques were employed to analyze changes in pore structure before and after fract

APA, Harvard, Vancouver, ISO, and other styles

46

Fajarwati, Delia Aurora, Piter Lepong, and Wahidah Wahidah. "Analisis Proksimat dan Ultimat Terhadap Total Sulfur dan Nilai Kalori pada Batubara (PT Geoservices Samarinda)." GEOSAINS KUTAI BASIN 6, no. 2 (2023): 126. http://dx.doi.org/10.30872/geofisunmul.v6i2.1145.

Full text

Abstract:

The price of coal in the market is largely determined by the caloric value. To find out what parameters affect the calorific value, it is necessary to do a correlation between the calorific value, inherent moisture, ash content and volatile matter contained in the coal where these contents are found in the proximate analysis and the carbon, nitrogen and hydrogen content in the ultimate analysis. In this study, apart from correlating the proximate data and ultimate data with calorific value, these two data were also correlated with total sulfur because sulfur greatly impacts the environment, so

APA, Harvard, Vancouver, ISO, and other styles

47

Li, Haijian, Qiang Zeng, Jianhong Kang, Gang Cheng, Jianwei Cheng, and Shengcheng Wang. "A Comparative Investigation of the Adsorption Characteristics of CO2, O2 and N2 in Different Ranks of Coal." Sustainability 15, no. 10 (2023): 8075. http://dx.doi.org/10.3390/su15108075.

Full text

Abstract:

The adsorption mechanism of carbon dioxide, oxygen and nitrogen in coal is important for preventing and controlling coal spontaneous combustion and for understanding the technology of CO2 storage in goaf. Adsorption amount and adsorption heat are key adsorption parameters that are required to understand the material and energy conversions during adsorption in coal. In this study, we studied the factors that influence the adsorption amounts and adsorption heat values of carbon dioxide, oxygen and nitrogen in coal by testing four different coal samples using conventional coal quality analysis, l

APA, Harvard, Vancouver, ISO, and other styles

48

VOTOLIN, K. S., S. A. SOZINOV, S. I. ZHEREBTSOV, and K. M. SHPAKODRAEV. "INVESTIGATION OF HUMIC SUBSTANCES FROM NATIVE AND OXIDISED BROWN COALS BY ANALYTICAL SCANNING ELECTRON MICROSCOPY." Chemistry for Sustainable Development 32, no. 6 (2024): 781–93. https://doi.org/10.15372/csd2024613.

Full text

Abstract:

The samples of native and naturally oxidised brown coals from the Tisul deposit of the Kansk-Achinsk coal basin, as well as the components isolated from them (humic acids (HA), fulvic acids (FA) and residual coal (RC)) were studied using the method of analytical scanning electron microscopy, proximate and ultimate analysis. It has been found that oxidised brown coal is characterised by an increased yield of HA, FA and volatile substances, ash content, oxygen, nitrogen and sulphur content, with lower concentrations of carbon and hydrogen in comparison with native coal. The HA fractions isolated

APA, Harvard, Vancouver, ISO, and other styles

49

Mullins, Oliver C., Sudipa Mitra-Kirtley, Jan Van Elp, and Stephen P. Cramer. "Molecular Structure of Nitrogen in Coal from XANES Spectroscopy." Applied Spectroscopy 47, no. 8 (1993): 1268–75. http://dx.doi.org/10.1366/0003702934067991.

Full text

Abstract:

Five major nitrogen chemical structures, present in coals of varying ranks, have been quantitatively determined with the use of nitrogen x-ray absorption near-edge spectroscopy (XANES). Similar studies of the sulfur chemical structures of coals have been performed for the last ten years; nitrogen studies on these fossil-fuel samples have only recently been realized. XANES spectra of coals exhibit several distinguishable resonances which can be correlated with characteristic resonances of particular nitrogen chemical structures, thereby facilitating analysis of these complicated systems. Many m

APA, Harvard, Vancouver, ISO, and other styles

50

Kuziemska, Beata, Paulina Klej, and Joanna Trębicka. "Effect of different nickel soil contents on cock’s-foot yield and nitrogen, phosphorus and potassium contents." Ochrona Srodowiska i Zasobów Naturalnych 27, no. 1 (2016): 15–21. http://dx.doi.org/10.1515/oszn-2016-0005.

Full text

Abstract:

AbstractThis study assessed the influence of liming and waste organic materials on the yield and nitrogen, phosphorus and potassium contents in cock’s-foot (Dactylis glomerata L.) grown on nickel-contaminated soil in the third year of a pot culture experiment. In the experiment, the following factors were taken into consideration: (1) nickel soil contamination (0, 75, 150 and 225 mg Ni·kg−1 of soil); (2) liming (0 Ca and Ca according to 1 Hh of soil) and (3) organic materials (no waste organic materials added, brown coal from a coal mine in Turów and rye straw). Introducing nickel into the soi

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!