Results 21 to 30 of about 294,631 (304)

Spin-dependent transport in metal/semiconductor tunnel junctions [PDF]

, 1995
This paper describes a model as well as experiments on spin-polarized tunnelling with the aid of optical spin orientation. This involves tunnel junctions between a magnetic material and gallium arsenide (GaAs), where the latter is optically excited with ...
Boeck, J. De,, Prins, M.W.J., De Boeck, J., Leuken, H. van,, Kempen, van, H., Roy, W van, Leuken, Van, H., Roy, van, W., Kempen, H. van, Groot, RA de, Boeck, J. De, Roy, W. van, Groot, R.A. de,, Leuken, H. van, De Boeck, J Jo, Groot, de, R.A., Groot, R.A. de, Roy, W. Van,, Leuken, H Van, Kempen, H van, Prins, M.W.J.,, Prins, MWJ Menno, Kempen, H. van,   +22 more
core   +3 more sources

Research on Shield Tunnelling Parameters Correlation in Composite Strata

Advances in Materials Science and Engineering, 2022
Shield tunnelling has become the development direction of tunnel construction due to its safety, economy, and speed. The complex formation has complicated geological changes, including soft rock, hard rock, and soft and hard inhomogeneous formation.
Ziqi Guo, Huipeng Zhang, Xiaoyang Shi, Zhi Huang, Yiyong Xu, Zhiqiang Zhang   +5 more
doaj   +1 more source

Three-dimensional modelling of the interaction between buildings and tunnelling operations [PDF]

, 2001
An extensive programme of research has been carried out at Oxford University on finite elementanalysis of the interaction between masonry buildings and ground movements induced by tunnelling.
Augarde, C.E., Bloodworth, Alan G., Houlsby, G. T., Burd, H.J., Augarde, C. E., Burd, H. J., Bloodworth, A.G., Houlsby, G.T.   +7 more
core   +1 more source

Tunnel face preconditioning using destress blasting under high geo-stress: a discrete element method considering crack evolution

Geomechanics and Geophysics for Geo-Energy and Geo-Resources
In underground engineering, rockburst caused by high ground stress pose a serious threat to the safety of personnel and equipment. Destress blasting has emerged as a promising method for mitigating rockburst risks.
Zhigang Yao, Mingcheng Han, Hang Liao, Tao Yu, Ningbo Zhu, Yong Fang   +5 more
doaj   +1 more source

Experimental and numerical analysis of thermal comfort in high-geothermal tunnel rest rooms

Case Studies in Thermal Engineering
In high-geothermal tunnel construction, rest rooms play a critical role in safeguarding workers' health and operational safety. To elucidate the thermal comfort characteristics of these spaces, a comprehensive questionnaire survey was administered to ...
Liufeng Su, Qixiang Yan, Yaozhong Cui, Zhengyu Xiong, Erli Wang, Chuan Zhang   +5 more
doaj   +1 more source

A liénard oscillator resonant tunnelling diode-laser diode hybrid integrated circuit: model and experiment [PDF]

, 2008
We report on a hybrid optoelectronic integrated circuit based on a resonant tunnelling diode driving an optical communications laser diode. This circuit can act as a voltage controlled oscillator with optical and electrical outputs.
Wasige, E., Ironside, Charlie, Romeira, B., Figueiredo, J., Figueiredo, J.M.L., Ironside, C.N., Slight, T., Slight, T.J., Wang, L.   +8 more
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Reconstructing enzyme evolution by protein engineering

FEBS Letters, EarlyView.
Natural enzyme evolution can be retraced by protein engineering methods such as directed evolution, rational design, and ancestral sequence reconstruction. These approaches reveal how enzymes emerged from ligand‐binding scaffolds, developed varying substrate preferences, formed oligomeric complexes, adapted to environmental changes, and evolved novel ...
Lukas Drexler, Markus R. Busch, Reinhard Sterner   +2 more
wiley   +1 more source

Intelligent construction method for rock slope fracture network model based on discrete element and neural network

Scientific Reports
To address the engineering challenge of accurately characterizing complex internal fracture networks in high-steep rock slopes, this study proposes an intelligent Discrete Fracture Network (DFN) construction method integrating field adit data and ...
Zhe Zhang, Huailin Chen, Honggang Wu, Tao Yang, Bokai Li, Hanqin Teng, Haotian Yang   +6 more
doaj   +1 more source

Study on the Effect of Natural Wind on the Smoke Spread Law of Extra-Long Tunnel Fires with Inclined Shafts for Air Supply and Exhaust

Buildings
High-temperature smoke generated by tunnel fires is the most important factor causing casualties. To explore the influence of natural wind on fire smoke movement in an extra-long highway tunnel based on the Taihang Mountain Tunnel, the distribution law ...
Yinjun Tan, Keli Wang, Zhiqiang Zhang, Zeyi Lu, Heng Zhang   +4 more
doaj   +1 more source

Tools for numerical modelling of tunnelling interactions [PDF]

, 2007
The ongoing development in the world's urban areas inevitably leads to the construction of structures in close proximity to already driven tunnels. Care should be taken to ensure that construction is carried out without damaging the tunnels or any other ...
Koungelis, Dimosthenis
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