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Articles 481 - 510 of 3204
Full-Text Articles in Earth Sciences
Velocity Analysis Method Of Reflected In-Seam Wave Detection Technique, Yang Yanjun, Zhu Shujie, Zhang Xiaowen, Wang Ji
Velocity Analysis Method Of Reflected In-Seam Wave Detection Technique, Yang Yanjun, Zhu Shujie, Zhang Xiaowen, Wang Ji
Coal Geology & Exploration
During the excavation of the roadway, using reflected in-seam waves detection technique to explore the structure of roadway and accurately interpret the wave impedance interface is of signality for mine production. The method of detecting the position of faults by reflected in-seam waves is usually inaccurate, which is mainly caused by the selected deviation of reflected in-seam waves velocity. In order to reduce the selected deviation of reflected in-seam waves velocity, this paper analyzed the features of reflected in-seam waves velocity of fifteen coal seam in thirteen coal mines and the velocity relationships of reflected in-seam waves, direct in-seam waves …
Study On Time-Frequency Characteristics And Field Test Of Giant Magnetostrictive Acoustic Wave Seismic Source, Wang Zelun, Gao Hongxin, Yu Shijian, Wang Yongshen
Study On Time-Frequency Characteristics And Field Test Of Giant Magnetostrictive Acoustic Wave Seismic Source, Wang Zelun, Gao Hongxin, Yu Shijian, Wang Yongshen
Coal Geology & Exploration
Wide-band, high-power and short-residual acoustic wave sources are the key technology for high-resolution detection of large-scale complex structures, in order to solve the contradiction between detection distance and resolution, a new acoustic wave detection instrument is developed by using the acoustic transmitter made of giant magnetostrictive material(GMM) as the source. The focal center frequency is 5 kHz, and the excitation voltage is 300-600 V, it has the characteristics of large radiated sound power, short residual vibration(3.5 cycles) and frequency band width(1-3 kHz), which solves the problem of the high resolution acoustic wave detection. Its greatest advantage is that the acoustic …
Simulation Of The Cutter Arrangement Pattern Of The Arc Pdc Drill Bit, Ju Pei, Wang Chuanliu
Simulation Of The Cutter Arrangement Pattern Of The Arc Pdc Drill Bit, Ju Pei, Wang Chuanliu
Coal Geology & Exploration
When drilling in a complex heterogeneous formation, due to the limitation of bit crown shape, the cutters of each part of the bit are subjected to non-uniform force, and the cutters at the local location are subjected to large impact load, which lead to the occurrence of bit vortex. In order to solve the problem, a “multi-level force balance” cutter circumferential arrangement scheme is proposed. By establishing the rock breaking finite element simulation model of the bit, the mechanical characteristics of the cutter and the bit under three circumferential cutter distribution modes(clockwise, counterclockwise and “multi-level force balance”) are analyzed. Simulation …
Simulation And Experimental Study On Dynamic Characteristics Of Radial Piston Hydraulic Chuck, Liang Chunmiao, Yao Ningping, Yao Yafeng, Li Kun, Peng Tao, Song Haitao
Simulation And Experimental Study On Dynamic Characteristics Of Radial Piston Hydraulic Chuck, Liang Chunmiao, Yao Ningping, Yao Yafeng, Li Kun, Peng Tao, Song Haitao
Coal Geology & Exploration
The chuck is an important part of the coal mine tunnel drilling rig. The performance of the chuck directly affects the efficiency and quality of drilling. Aiming at the problems of the rubber cylinder hydraulic chuck. a new radial piston hydraulic chuck is studied. The objective of this paper is to devise a new radial piston hydraulic chuck instead of rubber-sleeve hydraulic chuck. Then, the motion mathematical model of radial piston hydraulic chuck was established based on the radial piston chuck clamping and loosening of system structure and working principle. At the same time, a dynamic co-simulation of chuck hydraulic …
Analysis Of Bit Balling And Application Of The Balling-Preventing Drilling Fluid In Well Songke-2, Hu Yule, Hu Chen, Zhang Hengchun, Zheng Wenlong
Analysis Of Bit Balling And Application Of The Balling-Preventing Drilling Fluid In Well Songke-2, Hu Yule, Hu Chen, Zhang Hengchun, Zheng Wenlong
Coal Geology & Exploration
In order to solve the problem of the high mud content and easy hydration and dispersion of the Cretaceous sedimentary strata in well Songke-2, the bit balling is prone to occur in the water-based drilling fluid environment, which affects the drill bit ROP and induces downhole adhesion stuck, the paper combined the core drilling technology of well Songke-2, systematically analyzed of the causes of bit balling generated by the drill bit in the mudstone and water-based drilling fluid environment, provided a basis for the design of the anti-balling of the drill bit and the formulation of the anti-ball in drilling …
Test Of Near-Horizontal Drilling Hydraulic Reverse Circulation Coring In Leakage Formation, Yang Dongdong, Zhao Jiangpeng
Test Of Near-Horizontal Drilling Hydraulic Reverse Circulation Coring In Leakage Formation, Yang Dongdong, Zhao Jiangpeng
Coal Geology & Exploration
Based on the urgent need of accurate exploration of geological anomalous bodies such as collapse columns and small faults in underground coal mines for near-horizontal boreholes coring drilling of leakage formation, the double-wall hydraulic reverse circulation continuous coring technology was proposed, its technical principle and characteristics were analyzed, the matching ø89/42 mm double-wall coring drilling pipes and reverse circulation coring bits were developed. Three near-horizontal coring boreholes were drilled, the functional tests were carried out in a surface mine, the maximum core recovery rate of a single borehole was 83.6%, the maximum roundtrip footage was 69 m and the average …
Food Crops As Temporary Cover Before Pasture Sowing In Mountains Of Central Italy, Andrea Pardini, R. Tallarico, F. Natali
Food Crops As Temporary Cover Before Pasture Sowing In Mountains Of Central Italy, Andrea Pardini, R. Tallarico, F. Natali
IGC Proceedings (1977-2023)
No abstract provided.
Fire And Grazing To Improve Wildlife Habitat On Introduced Grass Monocultures In Texas, J. Alfonso Ortega‐S., Luis E. Ramirez, Wendy Austin, Leonard A. Brennan, G. Allen Rasmussen, Caesar Kleberg
Fire And Grazing To Improve Wildlife Habitat On Introduced Grass Monocultures In Texas, J. Alfonso Ortega‐S., Luis E. Ramirez, Wendy Austin, Leonard A. Brennan, G. Allen Rasmussen, Caesar Kleberg
IGC Proceedings (1977-2023)
No abstract provided.
Range Rehabiltation Technologies In Uzbekstan, T. Mukimov, A. Hamidov, M. Nasyrov, D. Johnson, Sh. Sindarov
Range Rehabiltation Technologies In Uzbekstan, T. Mukimov, A. Hamidov, M. Nasyrov, D. Johnson, Sh. Sindarov
IGC Proceedings (1977-2023)
No abstract provided.
Suitable Species For The Reclamation And Sustainability Of Saline Land In Southern Australia, Mary-Jane E. Rogers, A. D. Craig, T. D. Colmer, R. Munns, S. J. Hughes, P. G. H. Nichols, D. Henry
Suitable Species For The Reclamation And Sustainability Of Saline Land In Southern Australia, Mary-Jane E. Rogers, A. D. Craig, T. D. Colmer, R. Munns, S. J. Hughes, P. G. H. Nichols, D. Henry
IGC Proceedings (1977-2023)
No abstract provided.
Aspects Of Range Condition Recovery In The Southern Jebel Al Akhdar, Northeastern Libya, Adel Mahmoud, Ashraf Gadallah, Sanose Mohemmed, Musbah Mohamed, Adel Abdel‐Ghani, Ramadan Alhendawi, Peter J. Russell
Aspects Of Range Condition Recovery In The Southern Jebel Al Akhdar, Northeastern Libya, Adel Mahmoud, Ashraf Gadallah, Sanose Mohemmed, Musbah Mohamed, Adel Abdel‐Ghani, Ramadan Alhendawi, Peter J. Russell
IGC Proceedings (1977-2023)
No abstract provided.
Evaluation Of Fencing Grassland And Stopping Grazing On Grassland Restoration In Inner Mongolia, Shurun Liu
Evaluation Of Fencing Grassland And Stopping Grazing On Grassland Restoration In Inner Mongolia, Shurun Liu
IGC Proceedings (1977-2023)
No abstract provided.
Effect Of Land Use On Soil Quality In A Small Arid Catchment Of Upper Yangtze River Valley, Shiliang Liu, B. J. Fu, G. H. Liu, M. K. Ma, T. Lu, J. Y. Zhou
Effect Of Land Use On Soil Quality In A Small Arid Catchment Of Upper Yangtze River Valley, Shiliang Liu, B. J. Fu, G. H. Liu, M. K. Ma, T. Lu, J. Y. Zhou
IGC Proceedings (1977-2023)
No abstract provided.
Studies On The Effect Of Applying Fertilizer On Pinus Tabulaeformi In Shen Dong Mine, Meiying Liu, Yong Gao, Chunyuan Hu, Xiao He
Studies On The Effect Of Applying Fertilizer On Pinus Tabulaeformi In Shen Dong Mine, Meiying Liu, Yong Gao, Chunyuan Hu, Xiao He
IGC Proceedings (1977-2023)
No abstract provided.
Growth Characteristic, Productivity And Nutritive Value Of Forages By Reseeding Methods In Forest Fire Burnt Pasture, J. K. Lee, S. H. Yoon, Y. C. Lim, H. C. Ji, B. S. Jeon, K. Y. Kim, K. J. Choi, H. S. Park, S. Seo
Growth Characteristic, Productivity And Nutritive Value Of Forages By Reseeding Methods In Forest Fire Burnt Pasture, J. K. Lee, S. H. Yoon, Y. C. Lim, H. C. Ji, B. S. Jeon, K. Y. Kim, K. J. Choi, H. S. Park, S. Seo
IGC Proceedings (1977-2023)
No abstract provided.
Establishing Vegetation On Mine Waste Areas In Northern Sweden, Stig Ledin
Establishing Vegetation On Mine Waste Areas In Northern Sweden, Stig Ledin
IGC Proceedings (1977-2023)
No abstract provided.
An Update Of Seismic Monitoring And Research In The Vicinity Of The Paducah Gaseous Diffusion Plant: January 2018–December 2019, Zhenming Wang, N. Seth Carpenter, Edward W. Woolery
An Update Of Seismic Monitoring And Research In The Vicinity Of The Paducah Gaseous Diffusion Plant: January 2018–December 2019, Zhenming Wang, N. Seth Carpenter, Edward W. Woolery
Report of Investigations--KGS
From January 2018 to December 2019, the Kentucky Geological Survey monitored earthquakes and conducted research on seismic hazards in the vicinity of the Paducah Gaseous Diffusion Plant, a former uranium enrichment facility, in McCracken County, western Kentucky. Six hundred forty-four earthquakes with magnitude between 0.5 and 3.7 were recorded in the area during this period. Research focused on the influence of the thick sediments on earthquake ground motion, the so-called site response, through theoretical and data analysis of borehole seismic records. Our research has shown that the National Earthquake Hazards Reduction Program site classification, which is based on Vs30, and …
Restoration Technologies To Improve The Grazing Capacity Of Degraded Arid‐And Semi‐Arid Rangelands In South Africa, Klaus Kellner, Loraine Van Den Berg
Restoration Technologies To Improve The Grazing Capacity Of Degraded Arid‐And Semi‐Arid Rangelands In South Africa, Klaus Kellner, Loraine Van Den Berg
IGC Proceedings (1977-2023)
No abstract provided.
The Role Of Sansevieria Intermedia In Degradation And Recovery In Kenyan Drylands, Elizabeth Gallant King
The Role Of Sansevieria Intermedia In Degradation And Recovery In Kenyan Drylands, Elizabeth Gallant King
IGC Proceedings (1977-2023)
No abstract provided.
Changes Of Persistent Soil Seed Bank In Degraded Seriphidium Transillens Desert Grassland, Guili Jin, Jinzhong Zhu, Honglai Liu
Changes Of Persistent Soil Seed Bank In Degraded Seriphidium Transillens Desert Grassland, Guili Jin, Jinzhong Zhu, Honglai Liu
IGC Proceedings (1977-2023)
No abstract provided.
The Study For Grassland Nutrition Of Typical Grasslands Difference Degradation Grade, Yushan Jia
The Study For Grassland Nutrition Of Typical Grasslands Difference Degradation Grade, Yushan Jia
IGC Proceedings (1977-2023)
No abstract provided.
Efforts To Reduce Wind Erosion From Unpaved Roads Cut Through Environmentally Sensitive Alaskan And Hawaiian Rangelands, James P. Dobrowolski, Calvin F. Bagley
Efforts To Reduce Wind Erosion From Unpaved Roads Cut Through Environmentally Sensitive Alaskan And Hawaiian Rangelands, James P. Dobrowolski, Calvin F. Bagley
IGC Proceedings (1977-2023)
No abstract provided.
Spatial Fingerprint Of Younger Dryas Cooling And Warming In Eastern North America, David Fastovich, James M. Russell, Stephen T. Jackson, Teresa R. Krause, Shaun A. Marcott, John W. Williams
Spatial Fingerprint Of Younger Dryas Cooling And Warming In Eastern North America, David Fastovich, James M. Russell, Stephen T. Jackson, Teresa R. Krause, Shaun A. Marcott, John W. Williams
Faculty Authored Articles
The Younger Dryas (YD, 12.9–11.7 ka) is the most recent, near‐global interval of abrupt climate change with rates similar to modern global warming. Understanding the causes and biodiversity effects of YD climate changes requires determining the spatial fingerprints of past temperature changes. Here we build pollen‐based and branched glycerol dialkyl glycerol tetraether‐based temperature reconstructions in eastern North America (ENA) to better understand deglacial temperature evolution. YD cooling was pronounced in the northeastern United States and muted in the north central United States. Florida sites warmed during the YD, while other southeastern sites maintained a relatively stable climate. This fingerprint is …
Satellite-Based Monitoring Of Irrigation Water Use: Assessing Measurement Errors And Their Implications For Agricultural Water Management Policy, T. Foster, Taro Mieno, Nicholas Brozovic
Satellite-Based Monitoring Of Irrigation Water Use: Assessing Measurement Errors And Their Implications For Agricultural Water Management Policy, T. Foster, Taro Mieno, Nicholas Brozovic
Daugherty Water for Food Global Institute: Faculty Publications
Reliable accounting of agricultural water use is critical for sustainable water management. However, the majority of agricultural water use is not monitored, with limited metering of irrigation despite increasing pressure on both groundwater and surface water resources in many agricultural regions worldwide. Satellite remote sensing has been proposed as a low-cost and scalable solution to fill widespread gaps in monitoring of irrigation water use in both developed and developing countries, bypassing the technical, socioeconomic, and political challenges that to date have constrained in situ metering. In this paper, we show through a systematic meta-analysis that the relative accuracy of different …
Remote Sensing To Detect Deterioration Of Flooding Pampa Rangeland By The Use Of Glyphosate, E. J. Jacobo, A. Rodriguez, N. Heinrich, L. Fraschino
Remote Sensing To Detect Deterioration Of Flooding Pampa Rangeland By The Use Of Glyphosate, E. J. Jacobo, A. Rodriguez, N. Heinrich, L. Fraschino
IGC Proceedings (1977-2023)
No abstract provided.
The Response Of Potentilla Acaulis Population Property To Desertification Grassland In Agro‐Pastoral Ecotone Of Northern China, J. Mi, J. Wang, L. Lin, Kun Wang
The Response Of Potentilla Acaulis Population Property To Desertification Grassland In Agro‐Pastoral Ecotone Of Northern China, J. Mi, J. Wang, L. Lin, Kun Wang
IGC Proceedings (1977-2023)
No abstract provided.
Predicting Soil Erosion And Deposition Effects On Plant Establishment: A Key To Increasing Restoration Success, J. E. Herrick, D. P. C. Peters, Brandon T. Bestelmeyer, G. S. Okin, N. K. Hansen, Kris M. Havstad
Predicting Soil Erosion And Deposition Effects On Plant Establishment: A Key To Increasing Restoration Success, J. E. Herrick, D. P. C. Peters, Brandon T. Bestelmeyer, G. S. Okin, N. K. Hansen, Kris M. Havstad
IGC Proceedings (1977-2023)
No abstract provided.
Study On Responses Of Leymus Chinensis Of Degraded Grasslands To Kinds Of Improved Measures, Dan He, Xianglin Li, Liqiang Wan, Feng He
Study On Responses Of Leymus Chinensis Of Degraded Grasslands To Kinds Of Improved Measures, Dan He, Xianglin Li, Liqiang Wan, Feng He
IGC Proceedings (1977-2023)
No abstract provided.
Reasons Of The Deterioration Of Grassland Eco‐Environment In Inner Mongolia Pasturing Areas, Haishan
Reasons Of The Deterioration Of Grassland Eco‐Environment In Inner Mongolia Pasturing Areas, Haishan
IGC Proceedings (1977-2023)
No abstract provided.
Use Of Remote Sensing Satellite Images To Predict Pasture Biomass On Waikato Dairy Farms, C. Deanne Waugh, David A. Clark, S. F. Petch, G. Mata, A. Edirisinghe, Z. Ward
Use Of Remote Sensing Satellite Images To Predict Pasture Biomass On Waikato Dairy Farms, C. Deanne Waugh, David A. Clark, S. F. Petch, G. Mata, A. Edirisinghe, Z. Ward
IGC Proceedings (1977-2023)
No abstract provided.