Results 41 to 50 of about 20,071 (265)

Behavior of Sedimentary Rock Tunnel against Rigid Projectile Impact

Applied Sciences, 2022
The tunnels in present-day cities are experiencing varying degrees of loading conditions ranging from static to extreme loading. Therefore, the stability of underground tunnels needs to be analyzed and understood for safer and strengthened design.
Abdullah H. Alsabhan, Md. Rehan Sadique, Ali S. Alqarni, Shamshad Alam, Wonho Suh   +4 more
doaj   +1 more source

Osteology of the pectoral girdle and forelimb of Siriusgnathus niemeyerorum, a Late Triassic traversodontid cynodont from Brazil

The Anatomical Record, EarlyView.
Abstract Traversodontids are non‐mammaliaform cynodonts, herbivorous to omnivorous, that lived during the Triassic. In the Late Triassic, some members of this group increased in body size relative to other cynodont lineages and evolved postcranial adaptations associated with locomotion.
Jhonata H. A. Martins, Leonardo Kerber
wiley   +1 more source

Aquifer Drawdown and Recovery in the Northeast Groundwater Management Area, Wisconsin, USA: A Century of Groundwater Use

Geosciences, 2017
The Northeast Groundwater Management Area of Wisconsin, USA contains two major cones of depression in a confined sandstone aquifer. Each cone is centered near cities that have used groundwater for over 100 years.
John A. Luczaj, Julie Maas, David J. Hart, Jonathan Odekirk   +3 more
doaj   +1 more source

Strategies for Greater Inclusion of Indigenous Students in College Science Programs

Biochemistry and Molecular Biology Education, EarlyView.
ABSTRACT The substantial underrepresentation of American Indian, Alaskan Native, and Native Hawaiʻian (AI/AN/NH) students in Science, Technology, Engineering and Mathematics (STEM) majors at United States colleges and universities results from systemic barriers in higher education.
Jonathan D. Baker, Nievita Bueno Watts, Devon S. Isaacs, Matthew D. Johnson, DenYelle B. Kenyon, Racheal Killgore, Catherine Peltier, Jesse L. Peltier, Sasheen Shailee C. Raymond, Alan H. Savitzky, Hugh E. Smeltekop, Amy E. Sprowles, Melissa Tehee, Jennifer Yazzie, Mary Jo Ondrechen   +14 more
wiley   +1 more source

Experimental study on the damage characteristics of cyclic disturbance and acoustic emission characteristics of different types of sandstones under high stress in deep mines

Deep Underground Science and Engineering
Three sandstone specimens common in rock engineering were selected to study the differences in the mechanical properties of rocks with different lithologies. The development and expansion of the internal cracks in the specimens were observed by combining
Yujing Jiang, Bin Liang, Dong Wang, Ling Dong, Hengjie Luan, Changsheng Wang, Jiankang Liu   +6 more
doaj   +1 more source

The impact of high temperature on mechanical properties and behaviors of sandstone

Frontiers in Earth Science
The impact of high temperature environments on the physical and mechanical properties of rocks is a significant factor to consider. The investigation into the impact of elevated temperatures on the physical and mechanical characteristics of rocks holds ...
Juan Jin, Juan Jin, Jiandong Liu, Jiandong Liu, Weixi Chen, Guoping Li, Wei Cheng, Wei Cheng, Xiaowen Zhang, Xiaowen Zhang, Yifan Luo   +10 more
doaj   +1 more source

Review and prospects of shear test of bolted rock joints

Deep Underground Science and Engineering, EarlyView.
The laboratory shear test equipment, test method, and numerical simulation of bolted rock joints were summarized. The shortcomings and limitations of the current research were analyzed, and the research prospects were proposed. Abstract Rock bolting is a critical approach in geotechnical engineering for supporting weak rocks.
Shulin Ren, Fan Yang, Manchao He, Yong Yuan, Zhigang Tao   +4 more
wiley   +1 more source

Shear behavior of bolt–grout interfaces under constant normal stiffness: Influence of grout strength and thickness

Deep Underground Science and Engineering, EarlyView.
The effects of grout strength and thickness on the shear behavior of bolt–grout interfaces (BGI) under constant normal stiffness conditions are investigated. Shear strength, failure modes, and acoustic emission characteristics are examined. The findings reveal that grout strength exerts a significantly greater influence on BGI shear strength and ...
Sunhao Zhang, Dongqi Shang, Yujing Jiang, Jinge Zhang, Hongbin Chen, Tianqi Jiang   +5 more
wiley   +1 more source

Effect of Fluid Rheology And Sandstone Permeability on Enhanced Oil Recovery in a Microfluidic Sandstone Device

Applied Rheology, 2015
Maximizing oil recovery from current reserves is becoming more important as global usage continues to rise. In this paper, we present the development of two microfluidic sandstone devices of high complexity and differing permeability capable of quickly ...
Nilsson Michael A., Rothstein Jonathan P.   +1 more
doaj   +1 more source

Hydrophobization by Means of Nanotechnology on Greek Sandstones Used as Building Facades

Geosciences, 2013
Modern sustainable architecture indicates the use of local natural stones for building. Greek sandstones from Epirus (Demati, Greece, EN 12440) used as building facades meet aesthetic and have high mechanical properties, but the inevitable interaction ...
Georgios Karagiannis, Katia Matziaris, Maria Stefanidou   +2 more
doaj   +1 more source