Results 101 to 110 of about 10,474 (302)

Multiple injection techniques to stimulate complex fracture networks in coal reservoirs: A case study on gas disaster reduction of subsurface coal mine in southwest China

Deep Underground Science and Engineering, EarlyView.
An experimental device for physical simulation of hydraulic fracturing, comprising: a load‐bearing mechanism with multiple interconnected plates that collectively form an sample chamber; a load‐generating mechanisms, with multiple load‐generating mechanisms arranged within the experimental chamber.
Delei Shang, Farui Shi, Jun Lu, Minghui Li, Cunbao Li, Heping Xie   +5 more
wiley   +1 more source

The Underground Economy in the Late 1990s: Evading Taxes, or Evading Competition? [PDF]

This paper studies the driving forces behind the considerable expansion of the underground economy during the late 1990s. I propose a novel explanation for this phenomenon: the sharp increase in market competition worldwide, which reduces prices and ...
Liliane Karlinger
core  

Strengthening urban resilience in China through underground infrastructures management: Addressing global climate challenges with technological solutions

Deep Underground Science and Engineering, EarlyView.
This paper explores how climate‐resilient technologies, such as smart grids, digital twins, and self‐healing materials, can enhance urban resilience. It highlights the urgent need for proactive planning, public‐private collaboration, and data‐driven innovation to future‐proof underground infrastructure amid accelerating climate and urban pressures ...
Kai Chen Goh, Tonni Agustiono Kurniawan, Christia Meidiana, Abdelkader Anouzla, Faissal Aziz, Imran Ali, Joan Cecilia C. Casila, M. Imran Khan, Dongdong Zhang, Meihui Jiang, Mohd Hafiz Dzarfan Othman, Md Munir Hayet Khan, Kasun Kumara Dissanayake   +12 more
wiley   +1 more source

The size of the underground economy in Japan

This paper empirically analyzes the size of the underground economy in Japan. The results show that (i) the size of the underground GDP peaked in the early 1990s but has been declining since; (ii) the underground economy reached its peak in around 1992 ...
Kanao, Koji, Hamori, Shigeyuki
core  

Numerical simulation study on the evolution of the temperature field and frozen wall in fractured rock mass

Deep Underground Science and Engineering, EarlyView.
The evolution of the temperature field and frozen wall under different fracture conditions was examined by an artificial ground freezing‐based thermal‐hydraulic coupled model. It was observed that fracture inclination affects the interaction extent of freezing pipes and fracture, while phase transition extent is the dominant factor for heat transfer in
Chenyi Zhang, Tingting Luo, Tao Zhang, Tao Han, Xiaodong Zhao, Haipeng Li, Yanfei Ma, Faxing Zhang, Madhusudhan Bangalore Narasimha Murthy, Weihao Yang   +9 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 Ÿ Received: 15. 11. 2015             Ÿ Revised: 03. 02. 2016              Ÿ Accepted: 21. 02.
Seyed Abdolmajid Jalaee, anita dowlatzadeh, Omid Sattari, Behzad Nadjafi   +3 more
doaj  

Advancing mine pillar design: Evaluating traditional methods and integrating AI for enhanced stability of pillars in the Great Dyke, Zimbabwe

Deep Underground Science and Engineering, EarlyView.
B1 is bord width 1, B2 is bord width 2, L is the pillar length, W is the pillar width, red color and letter A represent the pillars, and white color and number 1 represent excavated areas. Pstress is the average pillar stress; σv is the vertical component of the virgin stress, MPa; and e is the areal extraction ratio. e = B o B o + B P ${\rm{e}}=\frac{{
Tawanda Zvarivadza, Hendrik Grobler, Peter Apata Olubambi, Moshood Onifade, Manoj Khandelwal   +4 more
wiley   +1 more source

Will the use of cashless subsidy potentially reduce illegal underground economy activity? A case study in Indonesia

Business, Management and Economics Engineering
Purpose – This study was conducted to understand the potential of cashless subsidy to reduce illegal underground economy activity in Indonesia. Research methodology – The research was done through a qualitative approach then analyzed based on the ...
Joshi Maharani Wibowo, Sugeng Hariadi
doaj   +1 more source

Capital Subsidies and Underground Production [PDF]

In this paper we investigate the effects of different fiscal policies on the firm choice to produce underground. We consider a tax evading firm operating simultaneously both in the regular and in the underground economy.
Francesco Busato, Bruno Chiarini, Pasquale de Angelis, Elisabetta Marzano   +3 more
core  

Performance assessment of a potential underground thermal storage facility: Case study of the closed mine Prosper‐Haniel in the Ruhr coal mining area in Germany

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