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Articles 15181 - 15210 of 16207
Full-Text Articles in Earth Sciences
Fracture Feature Recognition Of Sandstone After High Temperature Based On Ra/Af, Ge Zhenlong, Sun Qiang, Wang Miaomiao, Zhao Chunhu
Fracture Feature Recognition Of Sandstone After High Temperature Based On Ra/Af, Ge Zhenlong, Sun Qiang, Wang Miaomiao, Zhao Chunhu
Coal Geology & Exploration
It is of great significance to carry out the research on rock high temperature damage information identification for geothermal development and underground coal gasification. Based on the changes of acoustic emission parameters RA and AF in the failure process of sandstone after different high temperature treatments, the development and evolution law of different types of cracks in sandstone after high temperature treatment are studied. The results show that tensile cracks are dominant in the whole loading process of sandstone. When the loading stress exceeds 80% of the peak stress, the proportion of shear cracks increases rapidly, which can be regarded …
Long-Term Heat Transfer Performance Of Underground Coaxial Heat Exchanger For Medium-Deep Geothermal, Li Fengcui, Han Ershuai, Liang Lei, Wu Jing'an, Lu Bingxue
Long-Term Heat Transfer Performance Of Underground Coaxial Heat Exchanger For Medium-Deep Geothermal, Li Fengcui, Han Ershuai, Liang Lei, Wu Jing'an, Lu Bingxue
Coal Geology & Exploration
Underground coaxial heat exchanger(UCHE) for medium-deep geothermal has the characteristic of the high heat transfer capacity and outlet water temperature, so it has attracted great attention in the heating industry. However, the current research mainly focus on the heat transfer performance of the UCHE during a single heating period, with insufficient analysis on the long-term heat transfer performance. In this paper, considering the operation characteristics of heat supply in heating season and stopping working in non-heating season for underground coaxial heat exchanger for medium-deep geothermal, a numerical heat transfer model is proposed based on the energy conservation equation. The numerical …
Effect Of Arbuscular Mycorrhizal Fungi And Hippophae Rhamnoides On The Improvement Of The Dump Of Open-Pit Coal Mine In The Eastern Grassland, Miao Chunguang, Yang Huihui, Bi Yinli, Song Ziheng, Guo Nan
Effect Of Arbuscular Mycorrhizal Fungi And Hippophae Rhamnoides On The Improvement Of The Dump Of Open-Pit Coal Mine In The Eastern Grassland, Miao Chunguang, Yang Huihui, Bi Yinli, Song Ziheng, Guo Nan
Coal Geology & Exploration
The land barren, grassland degradation and difficult ecological restoration are serious in the open-pit mining area of eastern China. The symbiosis between arbuscular mycorrhizal fungi(AMF) and Hippophae rhamnoides and the effect of mycorrhiza on the development of Hippophae rhamnoides root system and the improvement of soil in the dumping site were analyzed. It was found that the plant height and crown width of inoculated AMF(+M) were increased by 20% and 21%, respectively. The root length and root volume of +M were 1.46 and 1.97 times of CK, respectively. The content of Glomalin in the rhizosphere soil of Hippophae rhamnoides in …
Development Of Deep Geothermal Energy And Its Influence On Geothermal Water Flow Field: Taking The Development Of Deep Geothermal Energy In Lankao County For An Example, Song Qianjin, Wang Gang, Xu Yichuan, Cheng Lei
Development Of Deep Geothermal Energy And Its Influence On Geothermal Water Flow Field: Taking The Development Of Deep Geothermal Energy In Lankao County For An Example, Song Qianjin, Wang Gang, Xu Yichuan, Cheng Lei
Coal Geology & Exploration
In order to study the influence of deep geothermal energy development on the flow field of thermal reservoir, deep geothermal energy development in Lankao County is selected as the research object. The geological structure and regional structure of the study area since Cenozoic are analyzed, and the of geothermal exploitation and existing problems in the area are investigated. According to the types of geothermal energy, the characteristics of the Quaternary(Q), Neogene Minghuazhen Formation(N2) and Neogene Guantao Formation(N1) are analyzed. The conditions of fault distribution, thermal reservoir development and water-resisting boundary in the area are found out …
Vegetation Disturbance Analysis In Coal Mining Area With High Ground Water Level Based On Landsat Time Series Ndvi Data, Fang Liangcheng, Chen Yongchun, An Shikai, Xu Yanfei, Yin Mengjie, Li Zhihui, Zhao Ping, Chen Yeyu
Vegetation Disturbance Analysis In Coal Mining Area With High Ground Water Level Based On Landsat Time Series Ndvi Data, Fang Liangcheng, Chen Yongchun, An Shikai, Xu Yanfei, Yin Mengjie, Li Zhihui, Zhao Ping, Chen Yeyu
Coal Geology & Exploration
The eastern mining area of China is an important coal and grain composite production area. Due to the flat terrain and high underground diving level, most of the subsidence caused by mining is perennial or seasonal water, which causes serious land, ecological and environmental problems. As an important part of the ecological environment in mining area, vegetation has dynamic characteristics due to the external disturbance and the change of environmental factors. The normalized difference vegetation index(NDVI) is a common indicator for remote sensing monitoring of vegetation growth. The analysis based on NDVI time series data can effectively reveal the disturbance …
Analysis Of Geophone Array Method In Low Snr Complex Area Of Ordos Basin, Wang Zhengliang, Xiao Guoqiang, Fu Qunli, Lyu Zhenchuan, Yao Zonghui, Shi Qingyang, Gao Bin, Yi Hongbin, Gao Qiang, Zhang Peng, Hou Jie, Shi Bingcheng, Wang Yanduo, Jiao Guixing
Analysis Of Geophone Array Method In Low Snr Complex Area Of Ordos Basin, Wang Zhengliang, Xiao Guoqiang, Fu Qunli, Lyu Zhenchuan, Yao Zonghui, Shi Qingyang, Gao Bin, Yi Hongbin, Gao Qiang, Zhang Peng, Hou Jie, Shi Bingcheng, Wang Yanduo, Jiao Guixing
Coal Geology & Exploration
In the northwest of Ordos Basin, there is serious random interference in the complex area, which leads to the low signal-to-noise ratio of seismic data in this area. In order to solve the problem of low signal-to-noise ratio(SNR) of seismic data in this area, a method study of suppressing random interference by geophone array is carried. The influence of random interference on the accurate calculation of NMO correction and static correction, the suppression of interference wave by geophone array, the influence of intra group height difference and array base distance on high frequency of seismic acquisition data are studied, and …
Difficulties And Optimization Of Wire-Line Core Drilling Technology For Broken Formation In Complex Structure Area Of Northwest Hunan, Kong Xiangwang, Zhang Shaohe, Wang Wenbin, Sun Pinghe, Wu Dongyu, Xiao Jincheng, He Hongsheng
Difficulties And Optimization Of Wire-Line Core Drilling Technology For Broken Formation In Complex Structure Area Of Northwest Hunan, Kong Xiangwang, Zhang Shaohe, Wang Wenbin, Sun Pinghe, Wu Dongyu, Xiao Jincheng, He Hongsheng
Coal Geology & Exploration
Taking Xiangcidi 1 Well in the complex structural area of northwest Hunan as an example, in view of the common drilling difficulties encountered during the drilling process such as low core adoption rate and stuck-drilling buried drilling, we adopted the self-developed pumpless reverse circulation advanced side spray line and optimized the drilling fluid system to effectively improve the core drilling rate of the drilling project. The new type of drilling tool can form a local reverse circulation at the bottom of the hole, and combined with the internal anti-clogging cone net of the drilling tool and the design of the …
Terrestrial Lidar Scanning And Gaming Engines: Using Unity3d To Visualize High-Resolution Point Clouds From Big Bat Cave, Kentucky, Jeffrey Aaron Baggett
Terrestrial Lidar Scanning And Gaming Engines: Using Unity3d To Visualize High-Resolution Point Clouds From Big Bat Cave, Kentucky, Jeffrey Aaron Baggett
Theses and Dissertations
Terrestrial LiDAR scanning has become a staple of modern speleological research and mapping due to its increasing availability, rapid deployment, and ability to collect large quantities of spatial data in a short period of time. In addition to spatial data, LiDAR scanners’ ability to record reflection intensity is of interest in the geoscience community as a proxy for surface reflectivity and as a means of aiding in visualizations when a lack of lighting prevents the use of photography at a useful scale. In this study, a methodology for rendering a stereoscopic, real-time rendering of a 10 scan, 425-million point portion …
Analysis Of Pistil Fertility In Early Generation Of Backcross Of Male Sterile Lines Ms‐4 Of Alfalfa, C. Gao, F. Shi, L. Cai, J. Sun, B. Du
Analysis Of Pistil Fertility In Early Generation Of Backcross Of Male Sterile Lines Ms‐4 Of Alfalfa, C. Gao, F. Shi, L. Cai, J. Sun, B. Du
IGC Proceedings (1977-2023)
No abstract provided.
Study On The Pollen Morphologies And Seed Setting Rate Of Hemarthria Compressa, Xiantao Fu, Chunhua Yang, Lingzhi Chen, Xinquan Zhang, Ke Ma
Study On The Pollen Morphologies And Seed Setting Rate Of Hemarthria Compressa, Xiantao Fu, Chunhua Yang, Lingzhi Chen, Xinquan Zhang, Ke Ma
IGC Proceedings (1977-2023)
No abstract provided.
Effect Of Space Mutagenesis On Different Moisture Content Of Alfalfa Seed, Peng Feng, Yunwei Zhang
Effect Of Space Mutagenesis On Different Moisture Content Of Alfalfa Seed, Peng Feng, Yunwei Zhang
IGC Proceedings (1977-2023)
No abstract provided.
Seed Yield Of Hybrid Brachiaria (Ciat 36061) With Nitrogen Fertilization, Enrique Cortes-Diaz, Erika Valdes‐Chimal, José L. Zaragoza Ramírez, Pedro A. Martínez-Hernández
Seed Yield Of Hybrid Brachiaria (Ciat 36061) With Nitrogen Fertilization, Enrique Cortes-Diaz, Erika Valdes‐Chimal, José L. Zaragoza Ramírez, Pedro A. Martínez-Hernández
IGC Proceedings (1977-2023)
No abstract provided.
Alfalfa Growth And Reproduction As Influenced By Plant Growth Regulators, W. H. Du, G. Wang, Z. Z. Cao, Alan W. Humphries
Alfalfa Growth And Reproduction As Influenced By Plant Growth Regulators, W. H. Du, G. Wang, Z. Z. Cao, Alan W. Humphries
IGC Proceedings (1977-2023)
No abstract provided.
The Master Tasks Of Forage Breeding In China, Guowen Cui, Gang Li, Huiqing Liu
The Master Tasks Of Forage Breeding In China, Guowen Cui, Gang Li, Huiqing Liu
IGC Proceedings (1977-2023)
No abstract provided.
Effects Of Seed Hydro‐Priming On Germination And Emergence In Different Varieties Of Poa Pratensis, L. Chen, Yanrong Wang, J. Q. Zhang
Effects Of Seed Hydro‐Priming On Germination And Emergence In Different Varieties Of Poa Pratensis, L. Chen, Yanrong Wang, J. Q. Zhang
IGC Proceedings (1977-2023)
No abstract provided.
The Effects Of Seeds Irradiation With 60Co‐Γ Ray On Seed Germination And Chromosome Of Melilotoides Ruthenica (L.) Sojak Cv. Zhilixing, X. Bian, F. Shi, H. Hao, Y. Xing, L. Gao
The Effects Of Seeds Irradiation With 60Co‐Γ Ray On Seed Germination And Chromosome Of Melilotoides Ruthenica (L.) Sojak Cv. Zhilixing, X. Bian, F. Shi, H. Hao, Y. Xing, L. Gao
IGC Proceedings (1977-2023)
No abstract provided.
Methods Of Investigating Natural Resources Of Grassland, Georges Métailié
Methods Of Investigating Natural Resources Of Grassland, Georges Métailié
IGC Proceedings (1977-2023)
No abstract provided.
Efficiency Of Water Use By Cactus Pear (Opuntia Spp.), Hennie A. Snyman
Efficiency Of Water Use By Cactus Pear (Opuntia Spp.), Hennie A. Snyman
IGC Proceedings (1977-2023)
No abstract provided.
Diversity – Independent Factors Predict Elevated Extinction Rates, Dustin Perriguey, Corinne Myers, Jason Moore, Louis Scuderi
Diversity – Independent Factors Predict Elevated Extinction Rates, Dustin Perriguey, Corinne Myers, Jason Moore, Louis Scuderi
Earth and Planetary Sciences ETDs
Multiple linear regression was used to determine the relationships between diversity-independent factors (i.e., abiotic, climatic) 2, 5, and 10 Myrs-prior to the most elevated Phanerozoic extinctions. We constructed five abiotic variables from Phanerozoic proxy records1–5 to compare to extinction rates: mean temperature, temperature instability, carbon cycle instability, continental weathering rates, and habitat instability. All three models were statistically significant (P < 0.05) and explained > 70% of the variation in Alroy’s6 three-timer generic extinction rates. However, the 2 Myr-prior model explained the most variance in extinction rates and had the most predictive power, based on adjusted and predictive R2 (~ 72% and 41%, respectively). Carbon …
The Analysis Of Groundwater Recharge In Mongolia Using Vadose Zone Modeling, Khulan Batsukh
The Analysis Of Groundwater Recharge In Mongolia Using Vadose Zone Modeling, Khulan Batsukh
Department of Earth and Atmospheric Sciences: Dissertations, Theses, and Student Research
Knowledge of groundwater recharge (GR) is vital for optimal water resources management under an arid continental climate. However, in vast territories such as Mongolia, direct measurements of GR are unfeasible because they mandate excessive costs, stemming from time-consuming and labor-demanding efforts. A valid alternative to direct measurements is numerical models based on the monitoring of precipitation (P) and evapotranspiration (ET) for simulating GR. While direct measurements of ET are logistically problematic and unpractical for large-scale applications, a reliable prediction may be derived from crop reference evapotranspiration (ET0) which is calculable …
Diversity – Independent Factors Predict Elevated Extinction Rates, Dustin Perriguey
Diversity – Independent Factors Predict Elevated Extinction Rates, Dustin Perriguey
Earth and Planetary Sciences Faculty and Staff Publications
Multiple linear regression was used to determine the relationships between diversity-independent factors (i.e., abiotic, climatic) 2, 5, and 10 Myrs-prior to the most elevated Phanerozoic extinctions. We constructed five abiotic variables from Phanerozoic proxy records1–5 to compare to extinction rates: mean temperature, temperature instability, carbon cycle instability, continental weathering rates, and habitat instability. All three models were statistically significant (P < 0.05) and explained > 70% of the variation in Alroy’s6 three-timer generic extinction rates. However, the 2 Myr-prior model explained the most variance in extinction rates and had the most predictive power, based on adjusted and predictive R2 (~ 72% and 41%, respectively). Carbon …
Short And Long Term Effects Of Lime And Gypsum Applications On Acid Soils In A Water-Limited Environment: 3. Soil Solution Chemistry, Geoff Anderson, Shahab Pathan, David Hall, Rajesh Sharma, James Easton
Short And Long Term Effects Of Lime And Gypsum Applications On Acid Soils In A Water-Limited Environment: 3. Soil Solution Chemistry, Geoff Anderson, Shahab Pathan, David Hall, Rajesh Sharma, James Easton
Grain and Other Field Crops Research Articles
Aluminum (Al) toxicity imposes a significant limitation to crop production in South Western Australia. This paper examines the impact of surface-applied lime and gypsum on soil solution chemistry in the short term (1 year) and the long-term (10 years) in water limited environments. In the experiments, we measured soil solution chemistry using a paste extract on soil profile samples collected to a depth of 50 cm. We then used the chemical equilibrium model MINTEQ to predict the presence and relative concentrations of Al species that are toxic to root growth (Al associated with Al3+ and AlOH2 or Toxic-Al) and less …
From Molecules To Mountains: A Multi-Proxy Investigation Into Ancient Climate And Topography Of The Pacific Northwest, Usa, Alex Mclean
Dissertations and Theses
The modern Cascades are a north-south striking mountain range that intercepts Pacific Ocean-derived moisture resulting in orographic precipitation on the western flank and a relatively arid rain shadow in the lee. Because of the strong coupling between topography and climate and consistent moisture source (Pacific Ocean) throughout the year, the region is ideally situated for paleoclimate studies that utilize the isotopic composition (δ18O and δD) of meteoric water to determine when uplifts occurred. Here, I synthesize the spatial and temporal evolution of stable isotopes in paleowater proxies across the Pacific Northwest during the Cenozoic. New volcanic glass (δD) …
Flow Dynamics In A Vadose Shaft – A Case Study From The Hochschwab Karst Massif (Northern Calcareous Alps, Austria), Eva Kaminsky, Lukas Plan, Thomas Wagner, Barbara Funk, Pauline Oberender
Flow Dynamics In A Vadose Shaft – A Case Study From The Hochschwab Karst Massif (Northern Calcareous Alps, Austria), Eva Kaminsky, Lukas Plan, Thomas Wagner, Barbara Funk, Pauline Oberender
International Journal of Speleology
Karst aquifers are highly vulnerable to contamination due to quick water flow through conduits. Their high heterogeneity and the poorly known infiltration effect of the vadose zone make quantification of recharge processes difficult. This study characterizes the water flow and storage in the upper vadose zone with almost four years monitoring of a permanent stream in a vadose shaft (Furtowischacht). Its small catchment of 4,500 m² is located in a former glaciated high Alpine environment (Hochschwab, Austria). High discharge fluctuations between 0.002 and 19 l/s, relatively high hydrograph recession coefficients, and transit velocities between 0.0015 and 2.4 m/s estimated with …
An Investigation On Some Ecological Characteristics Of Ziziphus Spina Chirsti (L.) In Southern Iran, A. R. Mahmoodi, Mansour Mesdaghi, Masoume Amirkhani, E. Kargari
An Investigation On Some Ecological Characteristics Of Ziziphus Spina Chirsti (L.) In Southern Iran, A. R. Mahmoodi, Mansour Mesdaghi, Masoume Amirkhani, E. Kargari
IGC Proceedings (1977-2023)
No abstract provided.
Stolon Characteristic Of Hemarthria Compressa In The Southwest Of China, Jinping Liu, Xinquan Zhang
Stolon Characteristic Of Hemarthria Compressa In The Southwest Of China, Jinping Liu, Xinquan Zhang
IGC Proceedings (1977-2023)
No abstract provided.
The Introduct And Comparision Experiment Of Clover, Chenqiong Li, Tianqiong Luo
The Introduct And Comparision Experiment Of Clover, Chenqiong Li, Tianqiong Luo
IGC Proceedings (1977-2023)
No abstract provided.
Wild Populations Of Red Clover And Their Agro‐Morphological Characteristics In Latvia Climate Conditions, B. Jansone, A. Jansons, L. Tiltina
Wild Populations Of Red Clover And Their Agro‐Morphological Characteristics In Latvia Climate Conditions, B. Jansone, A. Jansons, L. Tiltina
IGC Proceedings (1977-2023)
No abstract provided.
A Genetic Diversity Analysis Of Wild Caragana Korshinskii Based On Allozyme And Aflp, Zan Wang, Xuemin Wang, Hongwen Gao
A Genetic Diversity Analysis Of Wild Caragana Korshinskii Based On Allozyme And Aflp, Zan Wang, Xuemin Wang, Hongwen Gao
IGC Proceedings (1977-2023)
No abstract provided.
Development And Genetic Analysis Of A Mapping Population On Medicago Truncatula, Zhenwu Wei, Zhanhua Yang, Lifang Zhang
Development And Genetic Analysis Of A Mapping Population On Medicago Truncatula, Zhenwu Wei, Zhanhua Yang, Lifang Zhang
IGC Proceedings (1977-2023)
No abstract provided.