Results 121 to 130 of about 230,298 (298)
Underground economy modelling: simple models with complicated dynamics [PDF]
The paper aims to model the underground economy using two different models: one based on the labor supply method and a generalized model for the allocation of time.
Albu, Lucian-Liviu
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Deep Underground Science and Engineering, EarlyView.This study demonstrates the feasibility of an underground closed‐loop thermal storage facility at a post‐mining site, intended for seasonal heat energy storage. Its principal design shows water flow directions in winter and summer (1, 2), heat pumps (3), an upper water reservoir (4), and connecting pipes (5).
Dmytro Rudakov, Oleksandr Inkin
wiley +1 more source
Seismic analysis and design of tunnels within fault ground: A review
Deep Underground Science and Engineering, EarlyView.The research methods of seismic response of tunnels within fault ground, including field investigations, analytical solutions, physical experiments, and numerical simulations, and seismic countermeasures are discussed. The present study examines the shortcomings and limitations of the current research and design, and puts forward proposals for future ...
Xingda Wang +6 more
wiley +1 more source
AN IMPROVEMENT OF THE TANZI METHOD FOR THE ESTIMATION OF ITALIAN UNGERGROUND ECONOMY [PDF]
This paper deals with the Tanzi method for the estimation of underground economy. The approach is discussed and modified. Refinements on the variables and on the econometric technique are proposed. The “adjusted” Tanzi method is then used to estimate the
Maurizio Bovi
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Deep Underground Science and Engineering, EarlyView.This study investigated the spatial patterns and development mechanisms of urban underground space (UUS) in Shanghai using underground points of interest data. It revealed distinct development mechanisms between the main city and suburbs, highlighting the need for differentiated UUS planning and policies to optimize underground space resources ...
Chenxiao Ma +3 more
wiley +1 more source
Tax Toleration and Tax Compliance: How Government Affects the Propensity of Firms to Enter the Unofficial Economy [PDF]
How do government-supplied institutional benefits and the taxation and regulation of producers affect the propensity of private firms to enter the unofficial economy and evade taxation?
Hibbs, Douglas A.
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Dynamic cracking properties and generating conditions of coal under rapid gas release
Deep Underground Science and Engineering, EarlyView.Gas release tests revealed that crack initiation and propagation are jointly controlled by initial crack length, residual strength, and gas release velocity. A new outburst risk coefficient was thus developed from a fracture mechanics perspective, offering a novel predictive approach.
Bing Zhang +6 more
wiley +1 more source
Deep Underground Science and Engineering, EarlyView.This review synthesizes advances in predicting miners' vital signs by integrating environmental monitoring (dust, temperature, and gas) with physiological data. It highlights multi‐source data fusion techniques and early‐warning models for enhanced occupational safety in underground coal mines.
Junji Zhu +4 more
wiley +1 more source
The effects of the underground economy on economic competitiviness [PDF]
A real, almost palpable, connection exists between the official and the underground economy. More than that, both sides of the economy (official and underground) are connected with the competitiveness of a country.
Donici, Gabriel-Andrei/GA
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