Results 31 to 40 of about 13,879 (267)

Englacial Warming Indicates Deep Crevassing in Bowdoin Glacier, Greenland

Frontiers in Earth Science, 2020
All around the margins of the Greenland Ice Sheet, marine-terminating glaciers have recently thinned and accelerated. The reduced basal friction has yielded increased flow velocity, while the rate of longitudinal stretching has been limited by ice ...
Julien Seguinot, Martin Funk, Andreas Bauder, Thomas Wyder, Cornelius Senn, Shin Sugiyama   +5 more
doaj   +1 more source

Selection the optimal parameters of drilling and blasting operations at the open pit of stone coal 'Progorelica' - Baljevac [PDF]

Mining and Metallurgy Engineering Bor, 2016
Blasting is an integral part of excavation in the field 'Progorelica'. The quality of blasted material depends on proper selection of drilling and blasting operations, why the arrangement of boreholes and quantity of explosives need to be determined so ...
Cvetković Vladan, Petrović Milenko, Savić Ljubinko   +2 more
doaj   +1 more source

Auxiliary Sensor-Based Borehole Transient Electromagnetic System for the Nondestructive Inspection of Multipipe Strings

Sensors, 2017
Transient electromagnetic (TEM) techniques are widely used in the field of geophysical prospecting. In borehole detection, the nondestructive inspection (NDI) of a metal pipe can be performed efficiently using the properties of eddy currents.
Bo Dang, Ling Yang, Na Du, Changzan Liu, Ruirong Dang, Bin Wang, Yan Xie   +6 more
doaj   +1 more source

Experiences with performing a thermal response test in boreholes for heat pumps [PDF]

Acta Montanistica Slovaca, 2006
This paper presents a Thermal Response Test (TRT) performed in two testing boreholes for heat pumps in the Czech Republic. The TRT is a special in-situ technique used abroad for the determination of key parameters needed for the proper borehole design ...
Jiří Ryška
doaj  

Thermal Response Testing Results of Different Types of Borehole Heat Exchangers: An Analysis and Comparison of Interpretation Methods

Energies, 2017
The design phase of ground source heat pump systems is an extremely important one as many of the decisions made at that time can affect the system’s energy performance as well as installation and operating costs.
Angelo Zarrella, Giuseppe Emmi, Samantha Graci, Michele De Carli, Matteo Cultrera, Giorgia Dalla Santa, Antonio Galgaro, David Bertermann, Johannes Müller, Luc Pockelé, Giulia Mezzasalma, Davide Righini, Mario Psyk, Adriana Bernardi   +13 more
doaj   +1 more source

Dependence Models of Borehole Expansion on Explosive Charge in Spherical Cavity Blasting

Geosciences, 2019
In geotechnical practice, it is often necessary to improve the properties of soil and rock in which different structures are built. For this purpose, spherical cavity blasting can be applied to expand the borehole.
Denis Težak, Siniša Stanković, Ivan Kovač   +2 more
doaj   +1 more source

Slip versus dilation tendency parameter space as a tool for prospecting structurally controlled geothermal systems in greenfield: insights from the greater Ruhr region

Deep Underground Science and Engineering, EarlyView.
This study highlights that with the static and time‐dependent evolution of slip versus dilation tendency parameter space, structurally controlled deep geothermal systems can be selected within areas of higher permeability and lower seismic hazard. Abstract Faults play a vital role in the Earth's hydraulic system by facilitating fluid flow when dilating
Michal Kruszewski, Alessandro Verdecchia, Oliver Heidbach, Rebecca M. Harrington, David Healy   +4 more
wiley   +1 more source

Mathematical modelling of thermal and flow processes in vertical ground heat exchangers

Chemical and Process Engineering, 2017
The main task of mathematical modelling of thermal and flow processes in vertical ground heat exchanger (BHE-Borehole Heat Exchanger) is to determine the unit of borehole depth heat flux obtainable or transferred during the operation of the installation.
Pater Sebastian, Ciesielczyk Włodzimierz   +1 more
doaj   +1 more source

Permeability of granite from a shallow buried mountain pipe gallery tunnel under unloading confining pressure

Deep Underground Science and Engineering, EarlyView.
Triaxial compression tests under unloading confining pressure conditions were conducted to systematically analyze the permeability behavior of granite retrieved from the different classification surrounding rocks. Abstract The rock mass within mountain tunnels undergoes complex changes in permeability, strength, and deformation during tunneling ...
Xiaoyan Zhang, Yonghua Ye, Jianping Zuo, Baojiang Han, Weigang Jiao   +4 more
wiley   +1 more source

An assessment of stress and production rate of sucker rod heat pipes in oil well pumping system

Deep Underground Science and Engineering, EarlyView.
The sucker rod pumping system is the preferred oil extraction technique. The concept about equipping the hollow vacuum space in solid sucker rods with heat pipe has been scrutinized in terms of stress and oil production evaluation. Abstract The implementation of the heat pipe concept in sucker rods for oil pumping systems negates the requirement for an
R. S. Anand, Ang Li, Wenbo Huang, Juanwen Chen, Qingshan Ma, Fangming Jiang   +5 more
wiley   +1 more source