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Acc Form 140 Ctk Inventory And Control Log

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Acc Form 140 Ctk Inventory And Control Log – Open Access Policy Institutional Open Access Program Special Issue Guidelines Editorial Process Research and Publication Ethics Article Processing Fee Award Testimonials

All published articles are immediately available worldwide under an open access license. Reuse of a published article, including figures and tables, in whole or in part does not require special permission. For articles published under the Creative Common CC BY license; Any part of the article may be reproduced without permission with clear citation of the original article. For more information, read https:///openaccess.

Acc Form 140 Ctk Inventory And Control Log

Feature papers represent the most advanced research with significant potential for high impact in the field. Submit feature papers by personal invitation or at the suggestion of scientific editors and undergo peer review before publication.

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A feature paper is an original research article; A large-scale research study, often involving multiple techniques or approaches; Or it could be a comprehensive review paper with specific updates on the latest developments in the field, a systematic review of the most exciting developments in science. Literature This type of paper provides perspectives on future directions or potential applications of research.

Editor’s Choice articles are based on recommendations from scientific editors of journals around the world. The editors select a few recently published articles in the journal that they believe will be of particular interest to readers or important in a relevant research area. The aim of the journal is to provide a snapshot of some of the most exciting work published in various research areas.

Yibo He 1 Zhenqi Hu 2 * Yaokun Fu 1 Kun Yang 1 Rui Wang 2 3, Guomo Shi 1 Zhanjie Feng 2 Kirang Yang 2 and Liang Yu 1

Underground coal mining inevitably creates permanent cracks in the working face boundary that cannot be closed. The study of the three-dimensional morphology of the subsurface of permanent cracks allows to precisely constrain the formation and development of ground cracks. This information helps to reduce mining risks and is also essential to avoid environmental pollution. We chose the Zhangjiamao coal mine (China), located in a fracture-prone area, as a case study for modeling the formation of permanent cracks. After injecting gypsum slurry into the mine, a three-dimensional model of the ground acid is obtained by 3D (3D) laser scanner technology, which records the topography of the ground in 3D. Depending on the geological conditions of the prone area, the characteristics and main processes of internal soil cracks are limited: (1) the width of soil cracks decreases to 0 with increasing depth and is strongly affected by soil composition. (2) along the vertical continuity direction; Ground acids are generally inclined toward the inner side of the working face, but the direction is uncertain at different depths. (3) The horizontal propagation path of ground cracks becomes more complex with increasing depth. (4) on soil and water effects; Loose soil fills the bottom of floor cracks, affecting the 3D shape of the subsurface.

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Coal is still China’s main energy source. According to BP’s Statistical Review of World Energy 2020, the world’s coal mine volume is 7.742 billion tonnes. China’s coal mine volume is 3.902 billion tons. 50% of the world volume. Coal resources still account for 57 percent of China’s energy mix. According to the geology of coal seam deposits in China, coal is mainly exploited by underground mining [3]. Underground mining transfers rock movement and deformation to the surface, leading to surface collapse and major damage to the environment and infrastructure. Ground cracks are widely distributed among surface damages, many; often for a long time; causing problems and disasters [6]. It degrades soil quality, pollutes water resources and weakens the structure and stability of buildings [7, 8, 9, 10, 11, 12, 13]. In the vicinity of Polish hard coal deposits (Upper Silesian Basin), it caused extensive damage to minor architecture and roads, including the Catholic Church [14] and left steps and cracks in the ground. The excavation of a lignite mine near Mavropygi (Northern Greece) caused cracks in the ground, which destroyed many houses in the village and forced the relocation of the village. Ground cracking reduced plant shoot and root biomass and N, P, K concentrations, chlorophyll content and leaf area, and altered root hormone balance, decreasing and increasing GA, IAA, and CTK levels. ABA levels [16]. Also, soil cracks also reduce soil moisture [17]. In dry sandy areas, the undrilled area is comparable to the undrilled area. Each layer of 10 ~ 90 cm in the soil crack area has a significant effect on soil water content that varies with depth [18]. In areas prone to erosion due to heavy rains, soil cracking increases the extent of surface damage and reinforces it. Pearl holes of various sizes can form beneath topsoil, causing sudden and irregular damage [19]. Therefore, land resources; The main responsibility is to control the size of underground divisions and the size of underground development to minimize damage to infrastructure and ecological environment.

Field survey [20]; Several technical methods are currently used to identify ground cracks, including radar detection technology [13, 21, 22], satellite remote sensing technology [23, 24, 25, 26] and UAV [23, 25]. 26, 27]. The accuracy of UAV can reach centimeter level [28]. After identifying the ground cracks, the surface shape of the cracks can be cleaned. Width and length are easily available on the screen. Common methods include steel ruler measurements and image interpretation. However, it is difficult to observe the three-dimensional characteristics of the subsurface, such as width, depth of extension and direction of underground cracks. Therefore, subsurface morphology is the focus of current ground acidification research [ 29 ]. Detection methods for 3D analysis of ground acids mainly include the steel ruler measurement method [30]; Ground Penetrating Radar Method [31]; including ultrasonic method [32, 33], plastic rod measurement method [34] and in-situ drilling. Methods [35] Principles of detection methods; The advantages and disadvantages are summarized in Table 1.

All listed methods are limited in determining the subsurface shape and are not suitable for determining the entire three-dimensional subsurface shape with the required high accuracy. Three-dimensional (3D) laser scanning technology based on GPS technology [41, 42] is a technological improvement after implementation Non-contact scanning can determine the 3D coordinates of the target, thus creating a 3D model [43]. It is currently protected as a cultural heritage site [44]; Forest Standards [45]; It is mainly used in scene reconstruction [46] and deformation monitoring [47]. In this study, using 3D laser scanning technology, underground cracks caused by underground metal mining in Zhangjiamao coal mine (China) were identified.

Acc Form 140 Ctk Inventory And Control Log

The article is structured as follows: in the “Materials and Methods” section; We describe the sample material, experimental setup and data acquisition, which ultimately lead to the construction of the 3D acid model. In the “Results” section, we present the obtained data and show the width, depth width-depth; Analysis of extension angles and characteristics of cracks of underground cracks in horizontal sections; respectively. In the “Discussion” section, the complex subsurface morphology of subsurface cracking; We present the rationale of our experimental results and the limitations of the experimental methods along with suggestions for improvement. In the “Conclusions” section, we summarize the main findings of our study and propose possible directions for future work. The data flow chart is shown in Figure 1.

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The study area is the 15211 face in the Zhangjiamao (China) coal mine, which is located in a landslide-prone area. According to information obtained from borehole exposures and geological mapping; The strata include (from bottom to top): Middle to Upper Triassic Yanchang Formation (T2-3y); Middle Jurassic Yan’an Formation (J2y); Neogene Pliocene Baode, Formation (N2b); Quaternary Middle Pleistocene Lishi Formation (Q2l) and Quaternary Holocene aeolian sands (Q4eol). The Quaternary loess is gray or dark gray in color with an average thickness of 23.27 m. Loess is fine-grained and low in nitrogen but high in phosphorus and potassium. No zinc or manganese. The pH value is 8 to 8.5 and the holding capacity of manure is poor.

The overall structural type of working face is monoclinic. It strikes N-S and dips northwest. The designed coal thickness is 5.89 to 6 m; The cutting length is 296.75 m and the mine distance is 2065.72 m. No one is old.

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