Results 111 to 120 of about 38,421 (265)

Study on the failure mechanism of the shield excavation face in the sandy cobble stratum under different buried depths

Deep Underground Science and Engineering, EarlyView.
Abstract One of the significant challenges faced in shield tunnel construction is the risk of collapse resulting from abrupt changes in soil conditions in advance of the working face, particularly within the sandy cobble stratum. This study aims to effectively manage these sudden variations and to further investigate the failure mechanisms associated ...
Hua Jiang, Chongyang Liu, Ao Zhang, Xiaoyan Zhang, Yuhang Li   +4 more
wiley   +1 more source

Experimental study on burning rate and flame geometry in construction tunnel fires under high geothermal conditions

Deep Underground Science and Engineering, EarlyView.
Abstract As tunnel construction advances in lengths and depths, the construction of tunnels in high geothermal environments has become increasingly common, raising significant fire risks. In this study, a 1:20 scale model tunnel test platform was constructed to investigate the effects of a high geothermal environment on fire behavior in tunnels during ...
Xiaoxian Fei, Maozhen Liu, Jiayi Ha, Linbo Du, Zhi Li, Yuhao Li, Chuangang Fan   +6 more
wiley   +1 more source

Motion planning and control of an installation robot for attitude adjustment of arc parts in underground shield tunneling

Deep Underground Science and Engineering, EarlyView.
Inspired by spiders, the multilegged walk‐through assembling robot for arc parts achieves high‐precision synchronous control under heavy loads through dual‐layer hydraulic pose dynamics modeling and hierarchical pressure optimization, significantly enhancing shield tunneling assembly efficiency and precision.
Quan Xiao, Guofei Xiang, Liang Liao, Lai Wei, Hongli Wang, Songyi Dian   +5 more
wiley   +1 more source

Combining Relational Algebra, SQL, Constraint Modelling, and Local Search

, 2006
The goal of this paper is to provide a strong integration between constraint modelling and relational DBMSs. To this end we propose extensions of standard query languages such as relational algebra and SQL, by adding constraint modelling capabilities to ...
Aarts, Fagin, Flener, Fourer, Garey, MARCO CADOLI, TONI MANCINI, Ullman, Van Hentenryck   +8 more
core   +2 more sources

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

Modelling and Analysis of Autonomous Airport Surface Movement Operations based on Multi-Agent Planning

European Journal of Transport and Infrastructure Research
Both EASA and SESAR JU define a vision and roadmap towards an autonomous air traffic management system. Furthermore, past and ongoing SESAR JU projects investigate how to increase the efficiency and predictability of current operations by means of ...
Malte von der Burg, Alexei Sharpanskykh
doaj   +1 more source

Business Aviation in Germany: An empirical and model-based analysis [PDF]

The primary role of international airports is to serve the general public with scheduled and charter services, typically provided by airlines. Of secondary importance is their task to provide direct air transport access to the regional industry and to ...
Berster, Peter, Gelhausen, Marc Christopher, Wilken, Dieter   +2 more
core   +1 more source

RISK MANAGEMENT ISSUES ON THE CASE STUDY OF QANTAS CRASH IN BANGKOK, SEPTEMBER 1999 [PDF]

, 2001
The cycle of risk management is an essential procedure for every company in order to be able to manage its risks. The purpose of this discussion is to explore the risk management issue of Qantas crash in Bangkok, September 1999.
Medianti, Nani, Sulistiawan, Dedhy
core  

Fracture evolution of a thick soft protection layer and the water inrush mechanism in overburden under longwall mining

Deep Underground Science and Engineering, EarlyView.
Through shear–tensile creep tests and viscoelastic modeling, the fracture evolution of thick soft protective layers is clarified. Results show thickness‐dependent rheological failure modes that govern four types of roof water inrush, providing a mechanism‐based framework for hazard prediction and control. Abstract In the Jurassic coal‐bearing strata of
Mengnan Liu, Wei Qiao, Xianggang Cheng, Xiangsheng Meng, Peichao Feng   +4 more
wiley   +1 more source

Population densities and real estate development on the alignment of São Paulo’s Congonhas and Guarulhos airports’ runways

Transportes
Urban development surrounding commercial airports is a conflictual factor that hampers their operations, prevents their expansion, and may lead to their closure. São Paulo has 22 million in its metropolitan area. It is served by Congonhas (Domestic) and
Luiz Henrique Werneck de Oliveira
doaj   +1 more source