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An Experimental Study On The Yield Strength Of Cement Grout For Grouting In The Limestone Area Of A Coal Seam Floor, Zou Jun, Guo Yan, Gui Herong, Wang Weimin, Chen Zhenlin, Liu Faming, Dai Yanan, Hu Yang, Chen Zengbao, Li Jun, Gao Chuan, Li Heng

Coal Geology & Exploration

Objective and Methods In recent years, regional grouting through ground directional drilling has become the preferred technique for water disaster prevention and control in floor limestones in a coal mining area. In grouting engineering, the diffusion radius of cement grout, which has always received wide attention, is constrained by multiple factors including the shear yield strength (yield strength for short) and specific gravity of cement grout, along with grouting pressure. The diffusion radius in turn influences the implementation effects of on-site grouting engineering. Among its controlling factors, the yield strength of cement grout cannot be tested on site. Given this, …

Critical Technical Parameters Of Large-Diameter Multi-Stage Casing Drilling For Mine Rescue, Xu Chao, Yao Ningping, Jiang Lei, Tian Hongjie, Liu Zhi, Zhu Ning

Coal Geology & Exploration

Objective This study aims to meet the needs of mine rescue in cave-in accidents occurring in narrow underground spaces and to address the contradiction between equipment miniaturization and the drilling of large-diameter rescue boreholes under complex collapse conditions. Based on the goal of constructing a 60-m-long rescue passageway, this study developed a dual-power, composite drilling process based on multi-stage casing drilling technology for large-diameter horizontal rescue boreholes under complex collapse conditions. Furthermore, this study investigated the critical drilling parameters, aiming to provide a basis for the function development and parameter formulation of rescue equipment. Methods This study designed supporting three-stage …

Application Of Five Seismic Attributes In Natural Fracture Prediction For Deep Coalbed Methane Production Along The Eastern Margin Of The Ordos Basin, Tong Jiangnan, Wang Feng, Zhang Feng, Hou Wei, Li Zhongbai, Ji Liang, Jiang Yanan, Sun Wei

Coal Geology & Exploration

Background Natural fractures serve as both the primary storage space for free gas of deep coalbed methane (CBM) and pathways for hydrocarbon migration. Furthermore, these fractures can enhance the porosity and permeability of strata under the deep, high-pressure condition, significantly amplifying the permeability of coal seams. Therefore, the fine-scale characterization of the planar distribution of natural fractures is crucial to deep CBM production.Objectives and Methods This study investigated the No.8 coal seam in the Carboniferous Benxi Formation within the Daning-Jixian block on the eastern margin of the Ordos Basin. Through offset vector tiles (OVT) domain processing of offshore 3D …

Essential Pillars For The Post-2026 Colorado River Guidelines, Anne Castle, John Fleck, Eric Kuhn, Jack Schmidt, Kathryn Sorensen, Katherine Tara

The Traveling Wilburys of the Colorado River

The process for determining the operating rules for the Colorado River system that will take effect in 2027 is in full swing. While various alternative operating regimes have been proposed, no preferred or consensus alternative has yet emerged. As a group of experienced Colorado River colleagues without affiliation to any Basin State, Tribe, or interested stakeholder, we submit that there are fundamental principles that should form the basis of the ultimate Record of Decision defining management of the Colorado River for the future. We propose the following essential pillars for inclusion in the Post-2026 Guidelines.

Experimental Impacts Into Sloped Targets, J.L.B. Anderson, Tyler S.L. Kadrie, A.L. Miller, C.J. Cline Ii

Research & Creative Achievement Day

Asymmetric craters have been ob-served on sloped surfaces on the Moon [1] and extensively across Vesta [2] and Ceres [3]. For example, Lowell Crater (Fig. 1A) is a large crater on the surface of the Moon that has a small-er crater, Lowell H, which formed when an asteroid impacted the sloped surface of Lowell’s crater rim [1]. The topography map of Lowell H (Fig. 1B) shows the original sloped crater wall, the highly asymmetric and slumped Lowell H crater, and the debris flows that formed during its collapse.

Typically, impact cratering experiments are performed into smooth, flat-lying targets as a …

Geomorphic Monitoring Of Cedar Valley Creek: Investigating The Impact Of Restoration Projects And Stream Systems Over Time, Kyle Borske

Research & Creative Achievement Day

Streams and rivers are dynamic systems shaped by natural forces, but can be influenced by human intervention. This project focuses on Cedar Valley Creek to examine how geomorphic processes such as erosion, deposition, and sediment transport have been influenced over time by restoration efforts. By collecting data during field surveys, areas of instability will be identified and the effectiveness of the restoration project will be determined. This will give an understanding of the long term impacts of restoration projects and further insight on how to artificially maintain stream health.

Rapid Flips Between Warm And Cold Extremes In A Warming World, Sijia Wu, Ming Luo, Gabriel Ngar-Cheung Lau, Wei Zhang, Lin Wang, Zhen Liu, Lijie Lin, Yijing Wang, Erjia Ge, Jianfeng Li, Yuanchao Fan, Yimin Chen, Weilin Liao, Xiaoyu Wang, Xiaocong Xu, Zhixin Qi, Ziwei Huang, Faith Ka Shun Chan, David Yongqin Chen, Xiaoping Liu, Tao Pei

Plants, Soils, and Climate Faculty Publications

Rapid temperature flips are sudden shifts from extreme warm to cold or vice versa–both challenge humans and ecosystems by leaving a very short time to mitigate two contrasting extremes, but are yet to be understood. Here, we provide a global assessment of rapid temperature flips from 1961 to 2100. Warm-to-cold flips favorably follow wetter and cloudier conditions, while cold-to-warm flips exhibit an opposite feature. Of the global areas defined by the Intergovernmental Panel on Climate Change, over 60% have experienced more frequent, intense, and rapid flips since 1961, and this trend will expand to most areas in the future. During …

Trenching And Compost Sustain Grain Yield Increases Over Nine Years On Deep Sands But At A Cost, David J.M. Hall, Tom J. Edwards

Grain and Other Field Crops Research Articles

Context. Crops grown on deep sands on the south coast of WA are limited by soil physical and chemical properties including compaction and poor nutrition. Aims. Crops grown on deep sands on the south coast of Western Australia are limited by soil physical and chemical properties including compaction and poor nutrition. Our aim was to determine what effects deep-placed organic amendments have on soil properties and crop production in a deep sand and whether such amendments are profitable. Methods. A long-term field trial was conducted over nine years (2015–2023) to investigate soil amendments including lime (0 and …

Innovative Machine Learning, Isotopic, And Hydrogeochemical Techniques For Groundwater Analysis In Arid Landscapes In Egypt’S Eastern Desert, Saad Ahmed Mohallel, Hesham Morgan, Ali Elgendy, Surendra Maharjan, Shahryar Fazli, Wenzhao Li, Rejoice Thomas, Hesham El-Askary

Mathematics, Physics, and Computer Science Faculty Articles and Research

Groundwater serves as a lifeline in Egypt’s hyper-arid Eastern Desert, particularly for agricultural and domestic uses. However, a comprehensive understanding of groundwater origin, quality, and recharge dynamics in the region remains limited due to geological complexity, data scarcity, and the high cost of isotopic analysis. This study addresses these challenges by integrating stable isotopes (δ¹⁸O and δ²H), hydrogeochemical parameters, remote sensing, and explainable artificial intelligence (AI) to investigate groundwater dynamics and support sustainable water management strategies. A total of 34 groundwater samples were collected from three key aquifers: the Quaternary alluvium, Nubian Sandstone, and fractured Basement aquifers. Hydrochemical analyses and …

Decadal To Millennial-Scale Morphodynamic Evolution Of Microtidal Marshes, Samuel Mason Zapp

LSU Doctoral Dissertations

Tidal marshes are susceptible to rapidly converting to open water due to their low elevations within the tidal frame. A continuous supply of externally supplied mineral sediment and in situ organic material production is necessary to offset elevation losses from relative sea level rise and erosion. Complex feedbacks between hydrodynamics, the erosion, transport, and deposition of sediment, and physical modification of the landscape by the establishment of intertidal vegetation govern the spatial and temporal patterns of elevation response. This dissertation focuses on modeling how these dynamics drive marsh landscape evolution in the past, present, and into the future under changing …

Development Of Isoscapes For Hong Kong Freshwater Streams As A Basis For Ecological Studies, Hon Tim Yip

Lingnan Theses (MPhil & PhD)

Applications of isoscapes in terrestrial and marine ecosystems have grown notably as a tool for studying animal movement. However, isoscapes are rarely used in freshwater ecosystem because current iterations of isoscapes commonly model baseline distributions of bulk stable isotope analysis (SIA) data, which may be inadequate for providing the necessary resolution for fine spatial scale stream environments. This issue could potentially be addressed using compound specific stable isotope analysis, a new method that measures the isotopic composition of individual compounds to provide more comprehensive information than bulk SIA. My study focuses on δ¹³C of essential amino acids (EAA-δ …

The Effect Of Soil Conditioner And Growth Booster On The Agronomic Characters And Number Of Nodules Of Black Soybean, Tien Turmuktini, I Putu Rahmat Santoso, Lia Amalia, Nunung Sondari, Elly Roosma Ria, Yenny Muliani, Endang Kantikowati, Tualar Simarmata

Jurnal Kultivasi

Soil Conditioner & Growth Booster (SCGB) is a potion that was made to be used as a soil conditioner and plant growth promoter. SCGB is made from organic matter, biological fertilizers, soil ameliorants, and microelements. This research aims to determine the best dosage of SCGB on the agronomic characters, effective nodules, and black soybean variety ‘Detam-1’ yield. This research was conducted in the experimental field of the Faculty of Agriculture, Winaya Mukti University, Sumedang, Indonesia. This experiment used a simple randomized block design (RBD) with six treatments (0, 3, 6, 9, 12, 15 kg/ha) and repeated 4 times. The observation …

Mgrre_Geolog_Collections Weber, Harry B 1 21011286290000, Mgrre Western Michigan University

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Mgrre_Geolog_Collections Crowley, Orville 1 21037290830000, Mgrre Western Michigan University

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Mgrre_Geolog_Collections Lopez, Byrdie Et Al 1 21015284730000, Mgrre Western Michigan University

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Mgrre_Geolog_Collections Brown, Chloey 1 21049283400000, Mgrre Western Michigan University

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Mgrre_Geolog_Collections Buell, Darius & Charlotte, & Wallrich, W&R 1 21009292220000, Mgrre Western Michigan University

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Mgrre_Geolog_Collections Brokoff, Edmund & Coral 2 21051286160000, Mgrre Western Michigan University

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Mgrre_Geolog_Collections Squires 1-11 21045296250000, Mgrre Western Michigan University

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Mgrre_Geolog_Collections Schultz, Emil 1 21051285590000, Mgrre Western Michigan University

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Mgrre_Geolog_Collections Smith, George C 1 21007285830000, Mgrre Western Michigan University

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Mgrre_Geolog_Collections White, Irvine & Francis L 1 21051288350000, Mgrre Western Michigan University

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Mgrre_Geolog_Collections Shea, Mortimer J Et Al 1-25 21035305630000, Mgrre Western Michigan University

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Mgrre_Geolog_Collections Pavlis, Elmer & Dorothy 1-3 21055333270000, Mgrre Western Michigan University

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Mgrre_Geolog_Collections Brokoff, Edmund & Coral 1 21051285580000, Mgrre Western Michigan University

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Mgrre_Geolog_Collections Valleau Et Al 1-14 21055368810000, Mgrre Western Michigan University

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Mgrre_Geolog_Collections State Paradise 2-19 21055307630000, Mgrre Western Michigan University

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Mgrre_Geolog_Collections Ramsay, Ferris Et Al 1-29 21055303130000, Mgrre Western Michigan University

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Mgrre_Geolog_Collections State Union & Rokos Unit 1-18 21055314760000, Mgrre Western Michigan University

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Mgrre_Geolog_Collections Wheeler State 1-21 21055319440000, Mgrre Western Michigan University

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