Pub Date : 2021-04-16DOI: 10.15446/ESRJ.V25N1.93320
Zhongjie Wang, Minghe Lin
How to cite item Wang, Z., & Lin, M. (2021). Finite Element Analysis Method of Slope Stability based on Fuzzy Statistics. Earth Sciences Research Journal, 25(1), 123-130. DOI: https://doi. org/10.15446/esrj.v25n1.93320 In order to reduce the risk of slope stability evaluation due to the fuzziness of calculation parameters, a finite element analysis method of slope stability based on fuzzy statistics is proposed. Based on the principle of quasi-static method and with the help of the finite element software COMSOL multiphysics, this paper studies the stability of the gravel soil accumulation rock slope under the action of different seismic acceleration. By analyzing the displacement, plastic zone and safety factor of the rock soil slope, the stability of the rock soil slope is analyzed. The research results show that the fuzziness of mechanical parameters of rock and soil slope will lead to the fuzziness of position displacement and stress analysis results of rock and soil slope, and the analysis of rock and soil slope with the method of fuzzy finite element analysis can strengthen the comprehensive understanding of position displacement, stress and safety of rock and soil slope by engineers and technicians, and reduce the stability of rock and soil slope due to the fuzziness of calculation parameters to a certain extent Evaluate the risk qualitatively. ABSTRACT Finite element analysis method of slope stability based on fuzzy statistics
{"title":"Finite Element Analysis Method of Slope Stability based on Fuzzy Statistics","authors":"Zhongjie Wang, Minghe Lin","doi":"10.15446/ESRJ.V25N1.93320","DOIUrl":"https://doi.org/10.15446/ESRJ.V25N1.93320","url":null,"abstract":"How to cite item Wang, Z., & Lin, M. (2021). Finite Element Analysis Method of Slope Stability based on Fuzzy Statistics. Earth Sciences Research Journal, 25(1), 123-130. DOI: https://doi. org/10.15446/esrj.v25n1.93320 In order to reduce the risk of slope stability evaluation due to the fuzziness of calculation parameters, a finite element analysis method of slope stability based on fuzzy statistics is proposed. Based on the principle of quasi-static method and with the help of the finite element software COMSOL multiphysics, this paper studies the stability of the gravel soil accumulation rock slope under the action of different seismic acceleration. By analyzing the displacement, plastic zone and safety factor of the rock soil slope, the stability of the rock soil slope is analyzed. The research results show that the fuzziness of mechanical parameters of rock and soil slope will lead to the fuzziness of position displacement and stress analysis results of rock and soil slope, and the analysis of rock and soil slope with the method of fuzzy finite element analysis can strengthen the comprehensive understanding of position displacement, stress and safety of rock and soil slope by engineers and technicians, and reduce the stability of rock and soil slope due to the fuzziness of calculation parameters to a certain extent Evaluate the risk qualitatively. ABSTRACT Finite element analysis method of slope stability based on fuzzy statistics","PeriodicalId":11456,"journal":{"name":"Earth Sciences Research Journal","volume":"25 1","pages":"123-130"},"PeriodicalIF":0.9,"publicationDate":"2021-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42045088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-16DOI: 10.15446/ESRJ.V25N1.94162
Rong-Guo Chen
How to cite item Chen, R. (2021). Application of UAV Low Altitude Remote Sensing System in Sea Area Supervision. Earth Sciences Research Journal, 25(1), 65-68. DOI: https://doi.org/10.15446/esrj. v25n1.94162 The sea area supervision is the premise and guarantee of safeguarding national security, protecting national sovereignty, and realizing the development of marine resources, and its importance is self-evident. To carry out the national sea area work more efficiently, this study designed low altitude-Unmanned Aerial Vehicles (UAV) remote sensing system applied to the sea area supervision and analyzed the remote sensing photography technology and remote sensing image processing technology. Experiments verified the effectiveness of the system. The research results show that the UAV-based low altitude remote sensing system can extract high-precision sea area information through aerial images’ interpretation. It is hoped that this study can provide some reference for improving the efficiency of current sea area supervision. ABSTRACT Application of UAV-Low Altitude Remote Sensing System in Sea Area Supervision
{"title":"Application of UAV-Low Altitude Remote Sensing System in Sea Area Supervision","authors":"Rong-Guo Chen","doi":"10.15446/ESRJ.V25N1.94162","DOIUrl":"https://doi.org/10.15446/ESRJ.V25N1.94162","url":null,"abstract":"How to cite item Chen, R. (2021). Application of UAV Low Altitude Remote Sensing System in Sea Area Supervision. Earth Sciences Research Journal, 25(1), 65-68. DOI: https://doi.org/10.15446/esrj. v25n1.94162 The sea area supervision is the premise and guarantee of safeguarding national security, protecting national sovereignty, and realizing the development of marine resources, and its importance is self-evident. To carry out the national sea area work more efficiently, this study designed low altitude-Unmanned Aerial Vehicles (UAV) remote sensing system applied to the sea area supervision and analyzed the remote sensing photography technology and remote sensing image processing technology. Experiments verified the effectiveness of the system. The research results show that the UAV-based low altitude remote sensing system can extract high-precision sea area information through aerial images’ interpretation. It is hoped that this study can provide some reference for improving the efficiency of current sea area supervision. ABSTRACT Application of UAV-Low Altitude Remote Sensing System in Sea Area Supervision","PeriodicalId":11456,"journal":{"name":"Earth Sciences Research Journal","volume":"25 1","pages":"65-68"},"PeriodicalIF":0.9,"publicationDate":"2021-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42481364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-16DOI: 10.15446/ESRJ.V25N1.79152
D. Barrera, J. Molano
How to cite item Barrera-Cortes, M. & Molano, J. C. (2021). Characterization of hydrothermal events associated with the occurrence of coppermolybdenum minerals in the El Chucho creek at Cerrito, Valle del Cauca-Colombia. Earth Sciences Research Journal, 25(1), 5-12. DOI: https://doi.org/10.15446/esrj.v25n1.79152 At El Chucho creek, located to the west of the Valle del Cauca department in Colombia, some hydrothermal alterations affecting the Buga Batholith rocks and dykes of porphyritic quartz-dioritic and tonalitic composition were identified. These lithological units host mineral occurrences of pyrite, chalcopyrite, and molybdenite that occur disseminated in the rocks or associated with quartz veinlets. The hydrothermal alterations identified were phyllic, propylitic, and, in minor quantity, potassic. The two firsts alterations’ distribution is related to structures and pervasive, whereas the last one seems restricted to contact zones of porphyritic dykes on tonalite. Microthermometric data were acquired i) on quartz veinlets of 1 cm thick over a phyllic alteration zone, and ii) on quartz veinlet of 1 cm thick with chalcopyrite ± molybdenite and copper silicates, both veinlets cutting the phaneritic tonalite. Those data suggest that the mineralizing fluids have an aqueous-saline chemical system and were trapped under low volatile content. The microthermal data allowed authors to identify two mineralizing events. One of them of higher temperature, with homogenization temperatures between 275°C-480°C; as the second event is characterized by lower homogenization temperatures that range from 100°C to 139°C. ABSTRACT Characterization of hydrothermal events associated with the occurrence of copper-molybdenum minerals in the El Chucho creek at Cerrito, Valle del Cauca-Colombia
如何引用项目Barrera Cortes，M.&Molano，J.C.（2021）。与哥伦比亚考卡山谷Cerrito El Chucho溪铜钼矿物赋存有关的热液事件特征。《地球科学研究杂志》，25（1），5-12。DOI：https://doi.org/10.15446/esrj.v25n1.79152在哥伦比亚考卡山谷西部的El Chucho溪，发现了一些影响布加岩基岩石的热液蚀变，以及斑状石英闪长岩和英云闪长岩成分的岩脉。这些岩性单元含有黄铁矿、黄铜矿和辉钼矿的矿点，这些矿点散布在岩石中或与石英细脉有关。已确定的热液蚀变为千枚岩、丙基岩，少量为钾质。两个第一次蚀变的分布与结构和普遍性有关，而最后一次蚀变似乎仅限于英云闪长岩上斑岩脉的接触带。获得了显微测温数据：i）千枚蚀变带上1厘米厚的石英细脉，以及ii）黄铜矿±辉钼矿和铜硅酸盐的1厘米厚石英细脉。这些数据表明，矿化流体具有含水-盐水化学系统，并且被困在低挥发性含量下。微热数据使作者能够确定两个成矿事件。其中一种温度较高，均化温度在275°C至480°C之间；第二次事件的特点是均化温度较低，范围从100°C到139°C。摘要哥伦比亚考卡山谷Cerrito El Chucho小溪中与铜钼矿物赋存有关的热液事件特征
{"title":"Characterization of hydrothermal events associated with the occurrence of copper-molybdenum minerals in the El Chucho creek at Cerrito, Valle del Cauca-Colombia","authors":"D. Barrera, J. Molano","doi":"10.15446/ESRJ.V25N1.79152","DOIUrl":"https://doi.org/10.15446/ESRJ.V25N1.79152","url":null,"abstract":"How to cite item Barrera-Cortes, M. & Molano, J. C. (2021). Characterization of hydrothermal events associated with the occurrence of coppermolybdenum minerals in the El Chucho creek at Cerrito, Valle del Cauca-Colombia. Earth Sciences Research Journal, 25(1), 5-12. DOI: https://doi.org/10.15446/esrj.v25n1.79152 At El Chucho creek, located to the west of the Valle del Cauca department in Colombia, some hydrothermal alterations affecting the Buga Batholith rocks and dykes of porphyritic quartz-dioritic and tonalitic composition were identified. These lithological units host mineral occurrences of pyrite, chalcopyrite, and molybdenite that occur disseminated in the rocks or associated with quartz veinlets. The hydrothermal alterations identified were phyllic, propylitic, and, in minor quantity, potassic. The two firsts alterations’ distribution is related to structures and pervasive, whereas the last one seems restricted to contact zones of porphyritic dykes on tonalite. Microthermometric data were acquired i) on quartz veinlets of 1 cm thick over a phyllic alteration zone, and ii) on quartz veinlet of 1 cm thick with chalcopyrite ± molybdenite and copper silicates, both veinlets cutting the phaneritic tonalite. Those data suggest that the mineralizing fluids have an aqueous-saline chemical system and were trapped under low volatile content. The microthermal data allowed authors to identify two mineralizing events. One of them of higher temperature, with homogenization temperatures between 275°C-480°C; as the second event is characterized by lower homogenization temperatures that range from 100°C to 139°C. ABSTRACT Characterization of hydrothermal events associated with the occurrence of copper-molybdenum minerals in the El Chucho creek at Cerrito, Valle del Cauca-Colombia","PeriodicalId":11456,"journal":{"name":"Earth Sciences Research Journal","volume":"25 1","pages":"5-12"},"PeriodicalIF":0.9,"publicationDate":"2021-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41650187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
How to cite item Yaoning L., Shucai L., Maofei L., Xinming L., Weihong G. (2021). Influence of Metal Roadway Supports on Transient Electromagnetic Detection in Mines. Earth Sciences Research Journal, 25(1), 109-114. DOI: https://doi.org/10.15446/ esrj.v25n1.80156 To study the influence of metal supports in roadways on the detection of mines using the transient electromagnetic method, authors treated metal supports including anchor nets as a thin metal layer. According to the finite differences principle, the characteristics of the full-space transient electromagnetic response under the thin metal layer’s influence were calculated using a non-uniform grid. The thin metal layer's presence slowed the electromagnetic field’s diffusion rate and hindered the overall diffusion. The transient electromagnetic response curve observed under the thin metal layer’s influence was higher than that without the supports. Thicker metal layers resulted in higher early response values and slower decay rates. The decay rate increased as a function of time, gradually approaching that of the curve without metal supports. The simulation of the transient electromagnetic response to the model of water-containing lowresistance structures showed that the metal roadway support reduced the sensitivity of the transient electromagnetic method and weakened its response to low-resistance anomalies. ABSTRACT Influence of metal roadway supports on transient electromagnetic detection in mines
{"title":"Influence of metal roadway supports on transient electromagnetic detection in mines","authors":"Yaoning Liu, Shucai Liu, Maofei Li, Xinming Liu, Weihong Guo","doi":"10.15446/ESRJ.V25N1.80156","DOIUrl":"https://doi.org/10.15446/ESRJ.V25N1.80156","url":null,"abstract":"How to cite item Yaoning L., Shucai L., Maofei L., Xinming L., Weihong G. (2021). Influence of Metal Roadway Supports on Transient Electromagnetic Detection in Mines. Earth Sciences Research Journal, 25(1), 109-114. DOI: https://doi.org/10.15446/ esrj.v25n1.80156 To study the influence of metal supports in roadways on the detection of mines using the transient electromagnetic method, authors treated metal supports including anchor nets as a thin metal layer. According to the finite differences principle, the characteristics of the full-space transient electromagnetic response under the thin metal layer’s influence were calculated using a non-uniform grid. The thin metal layer's presence slowed the electromagnetic field’s diffusion rate and hindered the overall diffusion. The transient electromagnetic response curve observed under the thin metal layer’s influence was higher than that without the supports. Thicker metal layers resulted in higher early response values and slower decay rates. The decay rate increased as a function of time, gradually approaching that of the curve without metal supports. The simulation of the transient electromagnetic response to the model of water-containing lowresistance structures showed that the metal roadway support reduced the sensitivity of the transient electromagnetic method and weakened its response to low-resistance anomalies. ABSTRACT Influence of metal roadway supports on transient electromagnetic detection in mines","PeriodicalId":11456,"journal":{"name":"Earth Sciences Research Journal","volume":"25 1","pages":"109-114"},"PeriodicalIF":0.9,"publicationDate":"2021-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48564015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-16DOI: 10.15446/ESRJ.V25N1.86563
M. E. Hartwig, Leandro Ribes De Lima, D. Perissin
How to cite item Hartwig, M. E., De Lima, L. R., & Perissin, D. (2021). IW Sentinel-1 satellite scenes for the investigation of mine slope stability: experiences from the Riacho Dos Machados gold mine (Brazil). Earth Sciences Research Journal, 25(1), 93-99. DOI: https://doi.org/10.15446/ esrj.v25n1.86563 In the last decade, the Persistent Scatterer Interferometry – PSI have been largely employed to predict instabilities and failure in open pit mines. The PSI is a powerful technique, which combines radar satellite data in order to detect and monitor tiny surface displacements over vast areas. In the last years, the Sentinel-1 radar mission have produced images of the globe acquired with different spatial and temporal resolutions that are now freely available. In recent years, the footwall slopes of the Riacho dos Machados Gold Mine – MRDM (Minas Gerais state, southeastern Brazil) have recorded large planar failures controlled by foliation planes. Therefore, the focus of this paper is to evaluate a stack of 39 Interferometric Wide Sentinel-1 scenes, spanning from January 2018 to April 2019, acquired in descending orbit geometry, for the detection and monitoring of surface displacements. The results have shown that descending IW Sentinel-1 scenes can be used to provide a broad picture of the Line-Of-Sight LOS deformation phenomena. In order to monitor the evolution of the deformation phenomena induced by mining activities, LOS deformation maps with millimeter accuracy could be only delivered at least every 12 days. ABSTRACT IW Sentinel-1 satellite scenes for the investigation of mine slope stability: experiences from the Riacho dos Machados gold mine (Brazil)
如何引用项目Hartwig，M.E.、De Lima，L.R.和Perissin，D.（2021）。用于矿山边坡稳定性调查的IW Sentinel-1卫星场景：Riacho Dos Machados金矿（巴西）的经验。《地球科学研究杂志》，25（1），93-99。DOI：https://doi.org/10.15446/esrj.v25n1.86563在过去的十年里，持续散射干涉仪（PSI）在很大程度上被用于预测露天矿的不稳定性和失效。PSI是一种强大的技术，它结合了雷达卫星数据，以检测和监测大面积的微小表面位移。在过去的几年里，哨兵1号雷达任务产生了以不同的空间和时间分辨率获取的地球图像，这些图像现在可以免费获得。近年来，Riacho dos Machados金矿-MRDM（巴西东南部米纳斯吉拉斯州）的下盘边坡记录了受叶理面控制的大型平面破坏。因此，本文的重点是评估从2018年1月到2019年4月在下降轨道几何中获取的39个干涉宽哨兵-1场景，用于探测和监测表面位移。结果表明，下降的IW Sentinel-1场景可以用来提供视线LOS变形现象的全貌。为了监测采矿活动引起的变形现象的演变，至少每12天才能提供一次毫米精度的LOS变形图。用于矿山边坡稳定性调查的IW Sentinel-1卫星场景摘要：Riacho dos Machados金矿（巴西）的经验
{"title":"IW Sentinel-1 satellite scenes for the investigation of mine slope stability: experiences from the Riacho dos Machados gold mine (Brazil)","authors":"M. E. Hartwig, Leandro Ribes De Lima, D. Perissin","doi":"10.15446/ESRJ.V25N1.86563","DOIUrl":"https://doi.org/10.15446/ESRJ.V25N1.86563","url":null,"abstract":"How to cite item Hartwig, M. E., De Lima, L. R., & Perissin, D. (2021). IW Sentinel-1 satellite scenes for the investigation of mine slope stability: experiences from the Riacho Dos Machados gold mine (Brazil). Earth Sciences Research Journal, 25(1), 93-99. DOI: https://doi.org/10.15446/ esrj.v25n1.86563 In the last decade, the Persistent Scatterer Interferometry – PSI have been largely employed to predict instabilities and failure in open pit mines. The PSI is a powerful technique, which combines radar satellite data in order to detect and monitor tiny surface displacements over vast areas. In the last years, the Sentinel-1 radar mission have produced images of the globe acquired with different spatial and temporal resolutions that are now freely available. In recent years, the footwall slopes of the Riacho dos Machados Gold Mine – MRDM (Minas Gerais state, southeastern Brazil) have recorded large planar failures controlled by foliation planes. Therefore, the focus of this paper is to evaluate a stack of 39 Interferometric Wide Sentinel-1 scenes, spanning from January 2018 to April 2019, acquired in descending orbit geometry, for the detection and monitoring of surface displacements. The results have shown that descending IW Sentinel-1 scenes can be used to provide a broad picture of the Line-Of-Sight LOS deformation phenomena. In order to monitor the evolution of the deformation phenomena induced by mining activities, LOS deformation maps with millimeter accuracy could be only delivered at least every 12 days. ABSTRACT IW Sentinel-1 satellite scenes for the investigation of mine slope stability: experiences from the Riacho dos Machados gold mine (Brazil)","PeriodicalId":11456,"journal":{"name":"Earth Sciences Research Journal","volume":"25 1","pages":"93-99"},"PeriodicalIF":0.9,"publicationDate":"2021-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42896005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-16DOI: 10.15446/ESRJ.V25N1.94076
Xuli Wang
How to cite item Wang, X. (2021). Fractal characteristics of geomorphological heterogeneity in Xisha Islands waters under Multiple Linear Regression. Earth Sciences Research Journal, 25(1), 41-48. DOI: https://doi.org/10.15446/esrj. v25n1.94076 Based on the obvious anisotropy of Xisha Islands waters topography, the uneven fractal characteristics of Xisha Islands waters topography are studied by using multivariate linear expression. Using multiple linear regression analysis method to extract the projection of heterogeneous characteristic factors, the geometric heterogeneous characteristics of Xisha Islands waters are obtained. The fractal feature of landform is studied based on projection coverage method, and the non-isotropic body irregularity in Xisha Islands waters is measured. Experimental results show that this method can effectively analyze the non-uniform fractal characteristics of the Xisha Islands waters. The fractal dimension of different types of landforms in Xisha Islands in the corresponding region is high mountain area > medium and low mountain area > basin area, which reflects the difference of surface roughness or complexity of different types of landforms. The calculated fractal dimension is helpful to reveal the heterogeneity of general geomorphological features in different development stages. ABSTRACT Fractal characteristics of geomorphological heterogeneity in Xisha Islands waters under Multiple Linear Regression
{"title":"Fractal characteristics of geomorphological heterogeneity in Xisha Islands waters under Multiple Linear Regression","authors":"Xuli Wang","doi":"10.15446/ESRJ.V25N1.94076","DOIUrl":"https://doi.org/10.15446/ESRJ.V25N1.94076","url":null,"abstract":"How to cite item Wang, X. (2021). Fractal characteristics of geomorphological heterogeneity in Xisha Islands waters under Multiple Linear Regression. Earth Sciences Research Journal, 25(1), 41-48. DOI: https://doi.org/10.15446/esrj. v25n1.94076 Based on the obvious anisotropy of Xisha Islands waters topography, the uneven fractal characteristics of Xisha Islands waters topography are studied by using multivariate linear expression. Using multiple linear regression analysis method to extract the projection of heterogeneous characteristic factors, the geometric heterogeneous characteristics of Xisha Islands waters are obtained. The fractal feature of landform is studied based on projection coverage method, and the non-isotropic body irregularity in Xisha Islands waters is measured. Experimental results show that this method can effectively analyze the non-uniform fractal characteristics of the Xisha Islands waters. The fractal dimension of different types of landforms in Xisha Islands in the corresponding region is high mountain area > medium and low mountain area > basin area, which reflects the difference of surface roughness or complexity of different types of landforms. The calculated fractal dimension is helpful to reveal the heterogeneity of general geomorphological features in different development stages. ABSTRACT Fractal characteristics of geomorphological heterogeneity in Xisha Islands waters under Multiple Linear Regression","PeriodicalId":11456,"journal":{"name":"Earth Sciences Research Journal","volume":"25 1","pages":"41-48"},"PeriodicalIF":0.9,"publicationDate":"2021-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43148175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-16DOI: 10.15446/ESRJ.V25N1.85098
Adalto Gonçalves Lima, M. Pelegrina, Murilo Pontarolo
How to cite item Lima., A., G., Pelegrina, M. A., & Pontarolo, M. (2021). Fracture variability in basalts and its effect on river erosion: a case study in the Paraná volcanic province. Earth Sciences Research Journal, 25(1), 13-20. DOI: https:// doi.org/10.15446/esrj.v25n1.74167 The variation in the structural characteristics (cooling joints and tectonic fractures) of basaltic flows implies potential variability in the intensity of erosion by plucking. The erosive behavior of the rivers that sculpt these areas depends on their interaction with the diverse fracture systems. In view of this, we analyzed the effect of fracture variability (tipology, density and direction) in basalts on erosion in a bedrock river reach located in the Continental Volcanic Province of the Paraná Basin, southern Brazil. The fracture density and fracture direction were evaluated through field photogrammetry in seven sample areas distributed along a reach of 120 m. The fracture direction and main erosion axes were also surveyed by remote piloted aircraft (RPA) aerial imaging. The main erosion axes coincide with the principal fracture directions (tectonic fractures), which are disposed obliquely to the channel flow direction, making an average angle of 50°. The small, more abundant, and multidirectional cooling joints control the plucking process, but do not determine the erosion direction. The fracture density systematically decreases upstream from 9.62 to 3.73 m/m2, probably related to distance from a structural lineament which river crosses downstream. The higher fracture density favors more intense plucking due to decrease in the size of the rock blocks. The lower fracture density limits the plucking and favors the macroabrasion, mainly if associated with vesicular-amygdaloidal basalt. ABSTRACT Fracture variability in basalts and its effect on river erosion: a case study in the Paraná volcanic province
{"title":"Fracture variability in basalts and its effect on river erosion: a case study in the Paraná Volcanic Province","authors":"Adalto Gonçalves Lima, M. Pelegrina, Murilo Pontarolo","doi":"10.15446/ESRJ.V25N1.85098","DOIUrl":"https://doi.org/10.15446/ESRJ.V25N1.85098","url":null,"abstract":"How to cite item Lima., A., G., Pelegrina, M. A., & Pontarolo, M. (2021). Fracture variability in basalts and its effect on river erosion: a case study in the Paraná volcanic province. Earth Sciences Research Journal, 25(1), 13-20. DOI: https:// doi.org/10.15446/esrj.v25n1.74167 The variation in the structural characteristics (cooling joints and tectonic fractures) of basaltic flows implies potential variability in the intensity of erosion by plucking. The erosive behavior of the rivers that sculpt these areas depends on their interaction with the diverse fracture systems. In view of this, we analyzed the effect of fracture variability (tipology, density and direction) in basalts on erosion in a bedrock river reach located in the Continental Volcanic Province of the Paraná Basin, southern Brazil. The fracture density and fracture direction were evaluated through field photogrammetry in seven sample areas distributed along a reach of 120 m. The fracture direction and main erosion axes were also surveyed by remote piloted aircraft (RPA) aerial imaging. The main erosion axes coincide with the principal fracture directions (tectonic fractures), which are disposed obliquely to the channel flow direction, making an average angle of 50°. The small, more abundant, and multidirectional cooling joints control the plucking process, but do not determine the erosion direction. The fracture density systematically decreases upstream from 9.62 to 3.73 m/m2, probably related to distance from a structural lineament which river crosses downstream. The higher fracture density favors more intense plucking due to decrease in the size of the rock blocks. The lower fracture density limits the plucking and favors the macroabrasion, mainly if associated with vesicular-amygdaloidal basalt. ABSTRACT Fracture variability in basalts and its effect on river erosion: a case study in the Paraná volcanic province","PeriodicalId":11456,"journal":{"name":"Earth Sciences Research Journal","volume":"25 1","pages":"13-19"},"PeriodicalIF":0.9,"publicationDate":"2021-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49629722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-16DOI: 10.15446/ESRJ.V25N1.84276
I. Raimondi, V. Rodrigues, J. Z. Lima, J. P. Marques, L. A. A. Vaz, E. M. Vieira
How to cite item Raimondi, I. M., Silvestre-Rodrigues, V. G., Zanin-Lima, J., Pelinson-Marques, J., Artimonte-Vaz, L. A., & Vieira, E. M. (2021). Assessment of the use of tropical peats as local alternative materials for the adsorption of Pb, Zn and Cd: An equilibrium study. Earth Sciences Research Journal, 25(1), pending pages. DOI: https://doi.org/10.15446/esrj.v25n1.84276 Peat is an organic material that has been widely used as an efficient and low-cost adsorbent. As many studies tend to focus on temperate peats, there is a lack of knowledge about the adsorption mechanism of tropical peats. This paper investigates the use of two Brazilian peats (Cravinhos C and Luis Antônio LA) from the Mogi-Guaçu river basin for the adsorption of lead (Pb), zinc (Zn), and cadmium (Cd), in order to contribute to the use of local and easy access materials to remediate contaminated sites. The peats adsorbed a high percentage of cations, especially Pb cations (100.0-46.3%), with commercial peat C showing higher adsorption than peat LA. The removal order was Pb2+ > Cd2+ ≥ Zn2+ for C and Pb2+ > Zn2+ > Cd2+ for LA. The batch data for both peats and for all metals were better fit by the Langmuir isotherm, with adsorption capacities (qm) for Pb, Zn, and Cd of 37.3134, 29.0674 and 21.2890 mmol kg-1 in peat C and 21.7391, 14.2550 and 3.6460 mmol kg-1 in LA, respectively, values comparable to those of other peats and biosorbents. The studied peats are considered efficient, alternative and low-cost adsorptive materials for these metals. The proximity of peatlands to areas with high potential for contamination necessitates the use of local materials to reduce remediation costs. ABSTRACT Assessment of the use of tropical peats as local alternative materials for the adsorption of Pb, Zn and Cd: An equilibrium study
{"title":"Assessment of the use of tropical peats as local alternative materials for the adsorption of Pb, Zn and Cd: An equilibrium study","authors":"I. Raimondi, V. Rodrigues, J. Z. Lima, J. P. Marques, L. A. A. Vaz, E. M. Vieira","doi":"10.15446/ESRJ.V25N1.84276","DOIUrl":"https://doi.org/10.15446/ESRJ.V25N1.84276","url":null,"abstract":"How to cite item Raimondi, I. M., Silvestre-Rodrigues, V. G., Zanin-Lima, J., Pelinson-Marques, J., Artimonte-Vaz, L. A., & Vieira, E. M. (2021). Assessment of the use of tropical peats as local alternative materials for the adsorption of Pb, Zn and Cd: An equilibrium study. Earth Sciences Research Journal, 25(1), pending pages. DOI: https://doi.org/10.15446/esrj.v25n1.84276 Peat is an organic material that has been widely used as an efficient and low-cost adsorbent. As many studies tend to focus on temperate peats, there is a lack of knowledge about the adsorption mechanism of tropical peats. This paper investigates the use of two Brazilian peats (Cravinhos C and Luis Antônio LA) from the Mogi-Guaçu river basin for the adsorption of lead (Pb), zinc (Zn), and cadmium (Cd), in order to contribute to the use of local and easy access materials to remediate contaminated sites. The peats adsorbed a high percentage of cations, especially Pb cations (100.0-46.3%), with commercial peat C showing higher adsorption than peat LA. The removal order was Pb2+ > Cd2+ ≥ Zn2+ for C and Pb2+ > Zn2+ > Cd2+ for LA. The batch data for both peats and for all metals were better fit by the Langmuir isotherm, with adsorption capacities (qm) for Pb, Zn, and Cd of 37.3134, 29.0674 and 21.2890 mmol kg-1 in peat C and 21.7391, 14.2550 and 3.6460 mmol kg-1 in LA, respectively, values comparable to those of other peats and biosorbents. The studied peats are considered efficient, alternative and low-cost adsorptive materials for these metals. The proximity of peatlands to areas with high potential for contamination necessitates the use of local materials to reduce remediation costs. ABSTRACT Assessment of the use of tropical peats as local alternative materials for the adsorption of Pb, Zn and Cd: An equilibrium study","PeriodicalId":11456,"journal":{"name":"Earth Sciences Research Journal","volume":"25 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2021-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49499381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-16DOI: 10.15446/ESRJ.V25N1.93184
Shuilin Wang, Songyong Liu, Fanping Meng
How to cite item Wang, S., Liu, S. Y., & Meng, F. (2021). Fault diagnosis mechanism of gears and bearings for coal mining equipment in a complex geological environment. Earth Sciences Research Journal, 25(1), 115-122. DOI: https://doi.org/10.15446/ esrj.v25n1.93184 The traditional research method of fault diagnosis mechanism has poor stability, which leads to the difference of fault diagnosis and location results. Therefore, under the complex geological environment, a new research method of fault diagnosis mechanism of gear and bearing for coal mining equipment is proposed. This method calculates gears and bearings’ yield strength by analyzing coal mining equipment’s bearing capacity elasticity. According to the fitting degree, the equipment sample’s projection space is confirmed, the fault features of gear and bearing are extracted by segmentation algorithm, the optimal fitness is set by positioning algorithm, the location of fault center is obtained, and the fault mechanism diagnosis is studied. Experimental results show that compared with the traditional method, the proposed method is more stable, and the difference in fault diagnosis results is minimal. It can be seen that this method is more suitable for fault diagnosis of coal mining equipment. ABSTRACT Fault diagnosis mechanism of gears and bearings for coal mining equipment in a complex geological environment
{"title":"Fault diagnosis mechanism of gears and bearings for coal mining equipment in a complex geological environment","authors":"Shuilin Wang, Songyong Liu, Fanping Meng","doi":"10.15446/ESRJ.V25N1.93184","DOIUrl":"https://doi.org/10.15446/ESRJ.V25N1.93184","url":null,"abstract":"How to cite item Wang, S., Liu, S. Y., & Meng, F. (2021). Fault diagnosis mechanism of gears and bearings for coal mining equipment in a complex geological environment. Earth Sciences Research Journal, 25(1), 115-122. DOI: https://doi.org/10.15446/ esrj.v25n1.93184 The traditional research method of fault diagnosis mechanism has poor stability, which leads to the difference of fault diagnosis and location results. Therefore, under the complex geological environment, a new research method of fault diagnosis mechanism of gear and bearing for coal mining equipment is proposed. This method calculates gears and bearings’ yield strength by analyzing coal mining equipment’s bearing capacity elasticity. According to the fitting degree, the equipment sample’s projection space is confirmed, the fault features of gear and bearing are extracted by segmentation algorithm, the optimal fitness is set by positioning algorithm, the location of fault center is obtained, and the fault mechanism diagnosis is studied. Experimental results show that compared with the traditional method, the proposed method is more stable, and the difference in fault diagnosis results is minimal. It can be seen that this method is more suitable for fault diagnosis of coal mining equipment. ABSTRACT Fault diagnosis mechanism of gears and bearings for coal mining equipment in a complex geological environment","PeriodicalId":11456,"journal":{"name":"Earth Sciences Research Journal","volume":"25 1","pages":"115-122"},"PeriodicalIF":0.9,"publicationDate":"2021-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48668427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-16DOI: 10.15446/ESRJ.V25N1.94403
H. Fateh, A. Toube, A. Q. Gholipuri
How to cite item Fateh, H., Toube, A., & Gholipuri, A. Q. (2020). Wheat physiological traits response in standard and ecological agricultural systems. Earth Sciences Research Journal, 25(1), 131-136. DOI: https://doi.org/10.15446/esrj.v25n1.94403 This research was conducted on a farm of Payam-e-Noor University in Piranshahr, in West Azerbaijan province of Iran, during 2014-2015 and 2015-2016 crop sessions to investigate the wheat physiological traits response to standard and ecological agricultural systems. The experiment was conducted as a split-plot design with two factors and three replications. The first factor, which was considered the main plot, included high, low-input, and ecological agricultural systems. Subplots were seed pre-treatment, including control (without priming), hydro priming, and food priming with ascorbate. The results showed that the least photosynthesis rate and mesophilic conductance were related to lowinput agricultural system; however, in the ecological system, the transpiration, substomatal carbon dioxide, and water use efficiency of photosynthesis were the lowest. Also, seed priming increased the photosynthesis rate, mesophilic conductivity, and water use efficiency of photosynthesis. ABSTRACT Wheat physiological traits response in standard and ecological agricultural systems
{"title":"Wheat physiological traits response in standard and ecological agricultural systems","authors":"H. Fateh, A. Toube, A. Q. Gholipuri","doi":"10.15446/ESRJ.V25N1.94403","DOIUrl":"https://doi.org/10.15446/ESRJ.V25N1.94403","url":null,"abstract":"How to cite item Fateh, H., Toube, A., & Gholipuri, A. Q. (2020). Wheat physiological traits response in standard and ecological agricultural systems. Earth Sciences Research Journal, 25(1), 131-136. DOI: https://doi.org/10.15446/esrj.v25n1.94403 This research was conducted on a farm of Payam-e-Noor University in Piranshahr, in West Azerbaijan province of Iran, during 2014-2015 and 2015-2016 crop sessions to investigate the wheat physiological traits response to standard and ecological agricultural systems. The experiment was conducted as a split-plot design with two factors and three replications. The first factor, which was considered the main plot, included high, low-input, and ecological agricultural systems. Subplots were seed pre-treatment, including control (without priming), hydro priming, and food priming with ascorbate. The results showed that the least photosynthesis rate and mesophilic conductance were related to lowinput agricultural system; however, in the ecological system, the transpiration, substomatal carbon dioxide, and water use efficiency of photosynthesis were the lowest. Also, seed priming increased the photosynthesis rate, mesophilic conductivity, and water use efficiency of photosynthesis. ABSTRACT Wheat physiological traits response in standard and ecological agricultural systems","PeriodicalId":11456,"journal":{"name":"Earth Sciences Research Journal","volume":"25 1","pages":"131-136"},"PeriodicalIF":0.9,"publicationDate":"2021-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41533387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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