Results 91 to 100 of about 230,298 (298)

Revaluating the Tanzi-Model to Estimate the Underground Economy [PDF]

Since the early 1980s, the interest in the nature and size of the non-measured economy (both the informal and the illegal one) was born among researchers in the US. Since then, several models to estimate the shadow and/or the underground economy appeared
Brigitte Unger, Ioana Deleanu, Joras Ferwerda   +2 more
core  

Failure characteristics and the energy criterion of rock with a through‐going joint under true‐triaxial unloading conditions: Insights from the DEM model

Deep Underground Science and Engineering, EarlyView.
The rock failure mode is significantly influenced by the contributing factors, such as the joint inclination, the initial confining pressure, and the unloading point. We found six typical rock failure modes after a large number of numerical tests. Abstract Excavation unloading damages rock masses, with preferential failure along geological defects in ...
Fei Liu, Changhui Liang, Sijia Liu, Yongjun Zhang, Luo Wang   +4 more
wiley   +1 more source

A fuzzy logic approach to modeling the Underground economy in Iran [PDF]

Faslnāmah-i Pizhūhish/Nāmah-i Iqtisādī, 2011
The size of the underground economy (UE) is valuable information in the formulation of macroeconomic and fiscal policy. According to the hidden nature of underground economy, there will be a problem for studying and measuring it, therefore methods of ...
Ali Ghanbari, Seyed Hadi Makhzan Moosavi
doaj  

Geological and geotechnical challenges on the Great Dyke of Zimbabwe and their impact on hardrock pillar design

Deep Underground Science and Engineering, EarlyView.
The Great Dyke of Zimbabwe is notable for its rich platinum group metal deposits but poses significant geological and geotechnical challenges due to its complex rock types and structural features. Traditional pillar design methods are insufficient for addressing these complexities; the study suggests incorporating advanced techniques such as machine ...
Tawanda Zvarivadza, Hendrik Grobler, Moshood Onifade, Manoj Khandelwal   +3 more
wiley   +1 more source

Economy, Anti-Economy, Underground Economy: Conceptual and Terminological Problems

Ekonomika, 2005
This paper discusses conceptual and terminological problems stemming from the lack of discipline in the field of exploration of the economic phenomena reflecting the unregulated practices, practices of non- compliance with the official order and cases of
Povilas Gylys
doaj  

Why forums? An empirical analysis into the facilitating factors of carding forums

, 2013
Over the last decade, the nature of cybercrime has transformed from naive vandalism to profit-driven, leading to the emergence of a global underground economy. A noticeable trend which has surfaced in this economy is the repeated use of forums to operate
Shadbolt, Nigel, Webber, Craig, Yip, Michael   +2 more
core  

AN INTRODUCTION TO THE UNDERGROUND ECONOMY OF ROMANIA [PDF]

CES Working Papers, 2014
Shadow economy affected for a long time Romania, even since the old regime. During the period 1995-1996, the expansion of this phenomenon has become more serious. Along with Bulgaria, Romania is the second most affected country in the Eastern part of Europe, the shadow economy reaching around 28% of national GDP. This process is boosted by a high level
openaire   +2 more sources

Nonsilting transport characteristics of coal slurry in a deep underground fluidization conveying pipeline under the action of a guide vane swirler

Deep Underground Science and Engineering, EarlyView.
Aiming at the scientific frontiers of in situ fluidized mining of deep resources, a deep coal fluidized pipeline lifting system based on hydraulic conveying has been proposed. To solve the issue of particle sedimentation of large particles in horizontal connection sections, a solution involving the installation of guide vane‐type swirlers in the ...
Jiusheng Bao, Shaodi Zhao, Yan Yin, Zhongbin Wang, Shuai Liu, Shirong Ge   +5 more
wiley   +1 more source

A review on rockburst prediction and prevention to shape an ontology‐based framework for better decision‐making for underground excavations

Deep Underground Science and Engineering, EarlyView.
A scientometric analysis of 2449 journal articles and a comprehensive review of 336 papers were conducted, discussing and identifying challenges and research gaps in rockburst prediction and prevention and proposing an ontology‐based framework for better decision‐making in underground excavations. Abstract With underground engineering projects becoming
Hongchuan Yan, Haijiang Li, Hongqiang Xie, Mingli Xiao, Jianliang Pei, Huaizhong Liu, Jiangda He   +6 more
wiley   +1 more source

Measuring the size of underground economy in Iran with emphasis on the incentives for evasion of insurance premium payment (1961 – 2001) [PDF]

This paper attempts to estimate the size of underground economy in Iran and to identify the elements having taken a role in the creation of the same for the period 1961-2001 by using modified currency ratio method as a monetary approach to the estimation
Nikopour, Hesam
core   +1 more source