Results 101 to 110 of about 230,298 (298)
Deep Underground Science and Engineering, EarlyView.This paper investigates the high‐pressure water jet‐pick combined rock‐breaking mode (HPC), which employs high‐pressure water jets to precut grooves on both sides of the picks. The rock‐breaking patterns and performance of the HPC method are obtained, and the auxiliary rock‐breaking mechanism of water jet grooving is revealed.
Jingjing Lu +6 more
wiley +1 more source
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 +4 more
wiley +1 more source
AN ANALYSIS OF THE SHADOW ECONOMY IN EU COUNTRIES [PDF]
CES Working Papers, 2016 The paper aims at analysing the dimension of the underground economy in the EU states between 2003 and 2015. In order to achieve this goal, we use qualitative and quantitative methods. In the first two sections of the study we resort to conceptualisation
Brindusa Mihaela Tudose +1 more
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Market Consumption and Hidden Consumption: A Test for Substitutability [PDF]
In this paper we perform an empirical analysis on the relationship between private consumption and underground economy for the Italian case. We find that private market consumption and underground (or hidden) consumption may be defined as ”complementary ...
Bruno Chiarini, Elisabetta Marzano
core
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 +5 more
wiley +1 more source
The size of the underground economy in Germany: A correction of the record and new evidence from the Modified-Cash-Deposit-Ratio approach [PDF]
Based on the Ahumada et al. (2007, Review of Income and Wealth) critique we revise existing estimates of the size of the German underground economy. Among other things, it turns out that most of these estimates are untenable and that the tax pressure ...
Pickhardt, Michael, Sarda, Jordi
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An optimizing microseismic method for rock burst early warning based on mining production process
Deep Underground Science and Engineering, EarlyView.A classification early warning method of rock burst based on hourly microseismic data is proposed, which can be combined with the on‐site production process to provide more timely warning. Abstract Microseismic (MS) events have been reported in nearly every coal mining country, which could well lead to rock burst in underground coal mines.
Zepeng Han +6 more
wiley +1 more source
Deep Underground Science and Engineering, EarlyView.A novel cavity contraction solution and multilayer shaft wall model were developed to analyze deep shaft stability, considering rock viscosity, support structures, and water pressure, with successful validation through a Hulusu Coal Mine case study.
Bin Chen +5 more
wiley +1 more source
The Effect of Underground Economy on Importing Medicine in Iran
پژوهشهای سلامتمحور, 2016 The Effect of Underground Economy on Importing Medicine in Iran Jalaee Seyed Abdolmajid1,Dowlatzadeh Anita2*, Sattari Omid 3,Nadjafi Behzad4 Received: 15. 11. 2015 Revised: 03. 02. 2016 Accepted: 21. 02.
Seyed Abdolmajid Jalaee +3 more
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