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Articles 3931 - 3960 of 52469
Full-Text Articles in Entire DC Network
Effect Of Cadmium-Free Filler Metal On Mechanical Properties And Microstructure Of Pdc Cutters, Zhang Suhui, Yao Ningping, Liu Qingxiu, Liu Huan, Wang Dechuan
Effect Of Cadmium-Free Filler Metal On Mechanical Properties And Microstructure Of Pdc Cutters, Zhang Suhui, Yao Ningping, Liu Qingxiu, Liu Huan, Wang Dechuan
Coal Geology & Exploration
Objective PDC bits are critical components of geological support equipment and play a vital role in advancing technology and improving efficiency in the coal industry. Currently, PDC bits are brazed using silver filler metals containing cadmium, a toxic and polluting element. This study introduces the use of environmentally friendly, cadmium-free filler metals for brazing PDC bits. Methods The study investigates the wetting mechanism between brazing filler metals and base materials, utilizing Ag-Cu-Zn series brazing filler metals containing high silver and Sn, Mn and Ni, and only Ni for flame brazing of PDC cutters and steel. The shear strength of different …
Spatial Surveying Characteristics And Reconstruction Method Of Millimetre Wave Radar In Complex Environment Of Coal Mine Roadway, Xue Xusheng, Yang Xingyun, Yue Jianing, Wang Chuanwei, Mao Qinghua, Ma Hongwei, Wang Rongquan
Spatial Surveying Characteristics And Reconstruction Method Of Millimetre Wave Radar In Complex Environment Of Coal Mine Roadway, Xue Xusheng, Yang Xingyun, Yue Jianing, Wang Chuanwei, Mao Qinghua, Ma Hongwei, Wang Rongquan
Coal Geology & Exploration
Objective Underground spatial surveying of coal mine is an important part of transparent geological modelling for coal mine. However, the complex environment of coal mine roadway, incomplete information acquisition, insufficient accuracy of sensed data and other difficulties need to be urgently solved. Methods First, the signal characteristics of millimeter wave radar under the complex environmental factors such as dust, water mist, surrounding rock structure, etc. were studied in depth, the millimeter wave signal attenuation model was established for the surrounding rock of coal mine roadway, and the influence mechanism of complex environmental factors for millimeter wave radar was comparatively analyzed. …
Altitude-Driven Variations In Chrysophycean Stomatocyst Assemblages: Implications For Climate Reconstructions In The Three Parallel Rivers Of Yunnan Protected Area, China, Yanling Li, Qi Liu, Yangdong Pan, Wanting Pang
Altitude-Driven Variations In Chrysophycean Stomatocyst Assemblages: Implications For Climate Reconstructions In The Three Parallel Rivers Of Yunnan Protected Area, China, Yanling Li, Qi Liu, Yangdong Pan, Wanting Pang
Environmental Science and Management Faculty Publications and Presentations
The Three Parallel Rivers of Yunnan Protected Area (TPRYPA) is in the core area of the Hengduan Mountains, characterized by paralleling alternately high mountains and canyons that led to significant vertical temperature variation. Developing a climate transfer function for this region is crucial for both biodiversity protection and enhancing our understanding of feedback mechanisms between low-latitude and high-altitude areas in the context of global climate change. We investigated the chrysophycean stomatocyst assemblages from surface sediments of 46 high mountain lakes (altitude: 3244 to 5043 m) in the TPRYPA to assess the suitability of cysts in prediction of climate variability in …
Rock Burst Hazard Evaluation Of Coal Mining Face Based On A Gaussian Mixture Model, Cui Feng, Li Yifei, Jia Chong, Lu Changliang, He Shifeng, Zhang Suilin, Tian Mengqi
Rock Burst Hazard Evaluation Of Coal Mining Face Based On A Gaussian Mixture Model, Cui Feng, Li Yifei, Jia Chong, Lu Changliang, He Shifeng, Zhang Suilin, Tian Mengqi
Coal Geology & Exploration
Objective Deep insights into the probabilistic information contained in the energy distribution of acoustic emission (AE) or microseismic events are significant for the rock burst hazard evaluation of coal mining face. Methods This study investigated No.40111 mining face of the No.4 coal seam at the Dafosi Coal Mine in Shaanxi Province. Using physical simulation experiments with similar materials, theoretical analysis, and on-site monitoring, this study investigated the evolutionary patterns of AE monitoring data during coal mining and illustrated the physical meaning of fluctuations in the probability distribution of AE energy. Accordingly, this study proposed an index model for the rock …
Comment Letter For Butte Reduction Works (Brw) Phase Ii Interim Demolition Plan Construction Drawings And Floodplain Encroachment Analysis (Dated September 3, 2024), Emma Rott
Silver Bow Creek/Butte Area Superfund Site
No abstract provided.
Advances In Research On The Evolution Of Trans-Scale Discontinuous Structures During The Creeps Of Strongly Disturbed Coals, Zhang Liang, Wang Laigui, Ren Ting, Li Xiangchun, Gao Ke, Li Haitao, Zhao Shankun
Advances In Research On The Evolution Of Trans-Scale Discontinuous Structures During The Creeps Of Strongly Disturbed Coals, Zhang Liang, Wang Laigui, Ren Ting, Li Xiangchun, Gao Ke, Li Haitao, Zhao Shankun
Coal Geology & Exploration
Objective and Methods Disasters associated with surrounding rocks in roadways, such as time-dependent deformation failure and creep-induced rock bursts, severely threaten deep mines in China. These disasters, coupled with the impacts of deep mining and structural changes, render it urgent to explore the evolutionary patterns of trans-scale discontinuous structures during the creeps of strongly disturbed coals. This study systematically reviews the scale effects of coals' mechanical properties, the discontinuous structures and multi-physics field effects of coals, and the long-term stability, creep evolutionary patterns, and mechanical models of coals. It highlights the close correlation between discontinuous structures (including their fractures and …
Sedimentary Environments, Mechanical Properties, And Rock Burst Risk Identification Of Overburden In Deep Mines, Qiao Wei, Cheng Xianggang, Dou Linming, He Hu, Meng Xiangsheng, Ren Yangyang, Xiao Chong, Cai Jin
Sedimentary Environments, Mechanical Properties, And Rock Burst Risk Identification Of Overburden In Deep Mines, Qiao Wei, Cheng Xianggang, Dou Linming, He Hu, Meng Xiangsheng, Ren Yangyang, Xiao Chong, Cai Jin
Coal Geology & Exploration
Objective Disaster risk identification and prediction serve as a prerequisite for disaster control. An engineering geological environment is identified as the fundamental condition inducing dynamic disasters like rock bursts in mines. Exploring the sedimentary genetic mechanisms of engineering geological environments holds great significance for predicting rock burst risks. Methods With the Gaojiapu Coal Mine in the Binchang mining area, Shaanxi Province, as a case study, this study analyzed the engineering geological characteristics of rock masses under different sedimentary microfacies. Furthermore, it explored the deformation and failure characteristics of rocks in different sedimentary environments, along with the energy release patterns of …
An Experimental Study Of The Evolutionary Patterns Of Mechanical Properties Of Coals Under Multiple Mining Disturbances, Ouyang Zhenhua, Liu Yang, Li Chunlei, Shi Qingwen, Li Wenshuai, Yi Haiyang, Qin Hongyan, Zhang Ningbo
An Experimental Study Of The Evolutionary Patterns Of Mechanical Properties Of Coals Under Multiple Mining Disturbances, Ouyang Zhenhua, Liu Yang, Li Chunlei, Shi Qingwen, Li Wenshuai, Yi Haiyang, Qin Hongyan, Zhang Ningbo
Coal Geology & Exploration
Objective In the mining process of coal mines, the cyclic loading and unloading effects caused by multiple mining disturbances can alter the mechanical properties of coals, serving as a significant cause of rock bursts. Revealing the response characteristics of crucial mechanical parameters and the damage mechanisms of coals can provide a basis for discriminating the impact-induced instability state, holding great significance for enhancing disaster prediction capabilities. Methods Quasi-static uniaxial cyclic loading and unloading experiments and the dynamic impact loading experiments on large-size coal-like specimens were combined to accurately capture the stress, strain, and acoustic emission responses during the experiments, thoroughly …
Exploring The Evolutionary Patterns Of Stress Field In Coal Seams During Water Drainage In Overburden Confined Aquifers Based On Charge Monitoring, Wang Gang, Yu Xiaojie, Wang Aiwen, Xiao Xiaochun, Wang Yong, Ding Xin, Wang Weibin, Xu Zengjun, Du Lulu
Exploring The Evolutionary Patterns Of Stress Field In Coal Seams During Water Drainage In Overburden Confined Aquifers Based On Charge Monitoring, Wang Gang, Yu Xiaojie, Wang Aiwen, Xiao Xiaochun, Wang Yong, Ding Xin, Wang Weibin, Xu Zengjun, Du Lulu
Coal Geology & Exploration
Objective Deep coal mining areas in regions such as Inner Mongolia, Shaanxi, Shandong, and Gansu in China feature intricate hydrogeological conditions, which lead to substantial water drainage from roofs and increasingly prominent rock bursts induced by water drainage in overburden confined aquifers. This study investigated the evolutionary patterns of the stress field in coal seams during the water drainage of overburden confined aquifers. Methods By combining the laboratory charge induction experiments of coals under graded loading with charge monitoring pre- and post-water drainage from a roof in a coal mine, this study systematically examined the variations of induced charge in …
Evolutionary Characteristics Of Microcracks In Rocks Under Weak Dynamic Disturbance And Disaster Prevention And Control, Jiang Mingwei, Liang Yuntao, Feng Wenbin, Li Haitao, Zhou Rui, Guo Baolong, Liu Yang, Ma Ju
Evolutionary Characteristics Of Microcracks In Rocks Under Weak Dynamic Disturbance And Disaster Prevention And Control, Jiang Mingwei, Liang Yuntao, Feng Wenbin, Li Haitao, Zhou Rui, Guo Baolong, Liu Yang, Ma Ju
Coal Geology & Exploration
Objective High stress with superimposed weak dynamic disturbance serves as a critical factor including rock bursts. However, the microcrack propagation characteristics and energy dissipation pattern of rocks under different disturbance amplitude, frequencies, and unloading ranges remain unclear, leading to a lack of technical support for rock burst prevention and control.Methods Based on the true triaxial unloading dynamic disturbance tests, this study analyzed the instability failure patterns of deep surrounding rocks under different disturbance amplitude (5, 10 MPa), frequencies (4, 10 Hz), and triaxial stress unloading (0, 12 MPa). Moreover, this study examined the characteristics of microcracks in rocks using …
Advances In Research On Stratigraphic Characteristic Parameter Modeling And Safety Early Warning For Deep Geological Drilling Processes, Yang Yulong, Cao Weihua, Gan Chao, Li Yupeng, Wu Min
Advances In Research On Stratigraphic Characteristic Parameter Modeling And Safety Early Warning For Deep Geological Drilling Processes, Yang Yulong, Cao Weihua, Gan Chao, Li Yupeng, Wu Min
Coal Geology & Exploration
Significance As the new round of national exploration & development planning continues, resource exploration is advancing toward the deep Earth. However, deep strata exhibit diverse rock types, which complicate the measurement of rock mechanical parameters. Furthermore, the harsh environments of these strata, characterized by high temperatures, high pressures, and high in-situ stress, are prone to induce downhole accidents like drilling tool failure, wellbore collapse, loss of circulation, and well kicks, posing challenges to geological drilling. Advances Aiming at the perception and modeling of complex geological environments, this study reviews the existing studies on the modeling of stratigraphic characteristic parameters from …
New Materialism And Public Lands: Opportunities For Human And Nonhuman Interactions At Petroglyph National Monument, Madilynn M. Nolen
New Materialism And Public Lands: Opportunities For Human And Nonhuman Interactions At Petroglyph National Monument, Madilynn M. Nolen
Geography ETDs
Petroglyph National Monument (PETR) resides at the intersection of geology, urban development, and environmental preservation. As the site of convergence for these complex systems, this National Park site is an example of what kinds of interactions occur between humans and nonhumans and how these interactions mediate our broader understanding of material world. This project utilizes literature from more-than-human geographies and new materialism to examine how these interactions inform the management strategies of PETR. Through the interviews of 15 Volunteers-in-Parks and a focus group of five PETR employees, this project investigates what nonhuman entities are present on and around the monument, …
Carbon Restoration Potential On Global Land Under Water Resource Constraints, Shouzhang Peng, César Terrer, Benjamin Smith, Philippe Ciais, Qinggong Han, Jialan Nan, Joshua B. Fisher, Liang Chen, Lei Deng, Kailiang Yu
Carbon Restoration Potential On Global Land Under Water Resource Constraints, Shouzhang Peng, César Terrer, Benjamin Smith, Philippe Ciais, Qinggong Han, Jialan Nan, Joshua B. Fisher, Liang Chen, Lei Deng, Kailiang Yu
Biology, Chemistry, and Environmental Sciences Faculty Articles and Research
Ecosystem restoration is a critical nature-based solution to mitigate climate change. However, the carbon sequestration potential of restoration, defined as the maximum achievable carbon storage, has likely been overestimated because previous studies have not adequately accounted for the competition between ecosystem water demands for maximizing carbon sequestration and human water needs. Here we used a comprehensive process-based model combined with extensive land-use data and evaporation recycling accounting for land–atmosphere feedback to estimate the water requirements associated with ecosystem restoration. We found that achieving the carbon sequestration potential of restoration would significantly reduce global water availability per capita by 26%, posing …
Re: Butte Mine Flooding Operable Unit Berkeley Pit And Discharge Pilot Project – September 2024 Monthly Discharge Monitoring Report, Mark Thompson, Dave Griffis
Re: Butte Mine Flooding Operable Unit Berkeley Pit And Discharge Pilot Project – September 2024 Monthly Discharge Monitoring Report, Mark Thompson, Dave Griffis
Silver Bow Creek/Butte Area Superfund Site
No abstract provided.
Climate Change And The Logan River: Past, Present, And Future, Mercy Smith, Kendall Becker, Scott Hotaling
Climate Change And The Logan River: Past, Present, And Future, Mercy Smith, Kendall Becker, Scott Hotaling
All Current Publications
The Logan River runs through Idaho and northern Utah, beginning in the Bear River Mountains and flowing through Logan Canyon to Cutler Reservoir. The river is socially and ecologically significant to the Cache Valley community. Throughout its history, the Logan River’s water and energy have sustained life within the valley. However, climate change is threatening the Logan River’s support of both human and animal communities. Rising water temperatures and reduced flow caused by declining snowpack may impair the river’s ability to maintain healthy ecosystems.
Approval Letter For The Butte Priority Soils Operable Unit (Bpsou) Revised Draft Final Insufficiently Reclaimed Sites Belle Of Butte (Bres No. 8 & Ur-39) Remedial Action Work Plan (Rawp) (Dated September 27, 2024), Molly Roby
Silver Bow Creek/Butte Area Superfund Site
No abstract provided.
Re: Approval Of: Operations And Maintenance Manual, Horseshoe Bend Water Treatment Plant, Dated July 26, 2024., Jason Rappe
Re: Approval Of: Operations And Maintenance Manual, Horseshoe Bend Water Treatment Plant, Dated July 26, 2024., Jason Rappe
Silver Bow Creek/Butte Area Superfund Site
No abstract provided.
Re: Comments On: Draft Final Horseshoe Bend Effluent Line (Hbel) Discharge Structure Surface Enhancements Work Plan, Dated August 26, 2024., Jason Rappe
Silver Bow Creek/Butte Area Superfund Site
No abstract provided.
San Diego Collaboration For Conservation: Sustaining The Region's Legacy Of Biodiversity Conservation, Tessa Tinkler, Darbi Berry, A-Bel Gong, Bryan Cardenas, Daniela Olguin, Connelly Meschen, Eo Hanabusa
San Diego Collaboration For Conservation: Sustaining The Region's Legacy Of Biodiversity Conservation, Tessa Tinkler, Darbi Berry, A-Bel Gong, Bryan Cardenas, Daniela Olguin, Connelly Meschen, Eo Hanabusa
Environment
We are living through significant environmental, social, political, and economic challenges. These challenges have strained our communities and humanbuilt systems, as well as our interconnected habitats, wildlife, and natural systems. Lack of adequate infrastructure to withstand natural disasters and climate change, as well as historical and presentday inequities in resources across neighborhoods, are examples of the multifaceted and interconnected threats contributing to the accelerated loss of our rich biodiversity. This natural abundance is integral to our region’s health, history, and continued prosperity.
Tropical Hydrology And Critical Infrastructure In The Caribbean: The Impact Of The Prwreri, Walter F. Silva
Tropical Hydrology And Critical Infrastructure In The Caribbean: The Impact Of The Prwreri, Walter F. Silva
Sustainability Seminar Series
The Caribbean region is prone to natural hazards including hurricanes, floods, landslides and droughts. These natural phenomena carries impacts in the society, the infrastructure and the economy of this region. Puerto Rico was impacted by two major destructive hurricanes in 2017 (Hurricane Maria) and in 2022 (Hurricane Fiona). The consequences are still seen, and recovery is undergoing Rural communities struggle to maintain essential services operating 24/7; however, there is much to be done to have robust and resilient communities in Puerto Rico. Efforts to increase resilience and reduce risk are performed by several groups, including a collaborative project between Montclair …
Comment Letter For Draft Final Bpsou Quarterly Operations And Maintenance Report Butte Treatment Lagoon System – First Quarter 2024 (Dated June 26, 2024), Emma Rott
Silver Bow Creek/Butte Area Superfund Site
No abstract provided.
Approval Letter For The Butte Priority Soils Operable Unit (Bpsou) Revised Draft Final Quarterly Operations And Maintenance Report Butte Treatment Lagoon System – Fourth Quarter 2022 (Dated July 3, 2024), Emma Rott
Silver Bow Creek/Butte Area Superfund Site
No abstract provided.
Factors Influencing The Faunal Recolonization Of Restored Thornscrub Forest Habitats, Audrey J. Hicks, Jerald T. Garrett, Christopher A. Gabler
Factors Influencing The Faunal Recolonization Of Restored Thornscrub Forest Habitats, Audrey J. Hicks, Jerald T. Garrett, Christopher A. Gabler
School of Earth, Environmental, & Marine Sciences Faculty Publications
Tamaulipan thornscrub forests (thornforests) have high ecological and economic values, yet over 90% of these forests have been lost, and they remain threatened, making them a conservation hotspot. For decades, federal, state, NGO, and corporate entities have been acquiring land and actively or passively restoring these forests, but results have been mixed and seldom monitored. This study characterized and quantified faunal communities of restored thornforest habitats in south Texas and examined the relationships between restored faunal communities and key site characteristics and environmental factors. We surveyed and analyzed mammal, bird, Lepidoptera, and herptile communities within 12 restored sites in the …
Modern Governance System For Global Sustainable Development Goals, Bojie Fu, Jinghai Li, Junze Zhang
Modern Governance System For Global Sustainable Development Goals, Bojie Fu, Jinghai Li, Junze Zhang
Bulletin of Chinese Academy of Sciences (Chinese Version)
The Sustainable Development Goals (SDGs), as a key global framework for addressing social, economic, and environmental challenges, have drawn widespread attention due to the slow progress in their implementation. Despite the international community’s high regard for the SDGs, current research predominantly focuses on the assessment of progress and the analysis of interlinkages among the goals, with insufficient discussion on how to improve governance systems aimed at achieving the SDGs. Based on the system classification framework of SDGs, which includes “essential needs”, “objectives,” and “governance” categories, this study develops a governance system for the comprehensive realization of the SDGs. It analyzes …
Ecological View And Practice Of Chinese Path To Modernization, Yue Shi, Jiangling Zhu, Jingyun Fang
Ecological View And Practice Of Chinese Path To Modernization, Yue Shi, Jiangling Zhu, Jingyun Fang
Bulletin of Chinese Academy of Sciences (Chinese Version)
The Chinese path to modernization is characterized by emphasizing the harmony between humanity and nature. It upholds the principles of respecting, obeying, and protecting nature to achieve a coordinated integration of economic development and ecological conservation. This ecological view stems from China’s modernization practices, aligns with universal principles of modernization, and roots in features that are unique to China. It stresses a correct understanding of the human–nature relationship, the importance of systematic ecological planning and the central role of ecosystems in ecological conservation, and the necessity of following the laws of nature. Drawing on the experiences and lessons from Western …
Upholding “Triple Real” Vision For Ocean Negative Carbon Emissions To Advance Global Climate Governance, Nianzhi Jiao, Chuanlun Zhang, Tingwei Luo, Jihua Liu
Upholding “Triple Real” Vision For Ocean Negative Carbon Emissions To Advance Global Climate Governance, Nianzhi Jiao, Chuanlun Zhang, Tingwei Luo, Jihua Liu
Bulletin of Chinese Academy of Sciences (Chinese Version)
Addressing climate change is a formidable challenge for humanity, and achieving the temperature control goals of the Paris Agreement cannot rely solely on greenhouse gas emission reductions—negative emissions are an inevitable solution. The ocean, as the planet’s largest active carbon reservoir, holds immense potential for negative emissions, yet there is no internationally recognized pathway to realize it. The UNESCO-IOC international program of Ocean Negative Carbon Emissions (ONCE) builds on the original theory of the microbial carbon pump (MCP) and integrates known ocean carbon sequestration mechanisms BCMS (standing for biological carbon pump, carbonate counter pump, MCP, solubility carbon pump) to propose …
International Game And Strategic Analysis Of China’S Methane Emission Control, Zixu Su, Xinhe Bao
International Game And Strategic Analysis Of China’S Methane Emission Control, Zixu Su, Xinhe Bao
Bulletin of Chinese Academy of Sciences (Chinese Version)
Against the backdrop of methane emission control becoming a hot spot in global climate governance, China, as a major methane emitter, has committed to announcing its 2035 Nationally Determined Contributions covering all greenhouse gases before COP30, drawing significant attention from the world. In order to systematically analyze the international dynamics and China’s response strategies in methane emission control, this article explains the necessity and urgency of methane mitigation based on the current situation of global methane emission, and also clarifies essential meaning of international game to reveal China’s challenge and opportunity amid the backlash against globalization. Besides, it sorts out …
Carbon Emission Estimation For Computing Infrastructure: Methods, Progress, And Prospects, Xiaohong Chen, Liaoying Cao, Yangjie Wang, Zhuqian He, Wenzhi Cao
Carbon Emission Estimation For Computing Infrastructure: Methods, Progress, And Prospects, Xiaohong Chen, Liaoying Cao, Yangjie Wang, Zhuqian He, Wenzhi Cao
Bulletin of Chinese Academy of Sciences (Chinese Version)
As a foundational pillar of an increasingly digital and intelligent society, computing infrastructure embodies a dual nature—marked by high energy consumption and potential for emission reduction simultaneously. This duality positions it as a critical domain requiring balance under China’s dual-carbon goals. Nevertheless, there remains no clear consensus on methods for estimating its carbon emissions. Its ambiguity stems from differences in the applicability of assessment methods across various lifecycle stages, as well as a fragmented understanding of its intrinsic emissions and enabling effects on carbon mitigation. This study systematically reviews estimation methodologies from both broad and narrow perspectives, highlighting the heterogeneity …
Approval Letter For The Butte Priority Soils Operable Unit (Bpsou) Request For Change (Rfc-Rmap-2024-002) For The Soil Remedial Action At Mandan Park (Dated September 19, 2024), Molly Roby
Silver Bow Creek/Butte Area Superfund Site
No abstract provided.
Approval Letter For The Butte Priority Soils Operable Unit (Bpsou) Residential Metals Abatement Program (Rmap) Revised Yard Submittals Round 2 (Dated August 30, 2024), Molly Roby
Silver Bow Creek/Butte Area Superfund Site
No abstract provided.