Results 31 to 40 of about 207,008 (281)

Integration of a resonant tunneling diode and an optical communications laser [PDF]

, 2006
We report on the first integration of a resonant tunneling diode and an optical communications laser operating at around 1.5 /spl μm.
Stanley, CR, Stanley, C.R., Ironside, CN, C.R. Stanley, Ironside, C.N., Farmer, C.D., Hopkinson, M., M. Hopkinson, Slight, TJ, C.D. Farmer, T.J. Slight, C.N. Ironside, Farmer, CD, Slight, T.J., Hopkinson, M   +14 more
core   +1 more source

Analysis of Shear Stagger Deformation of Existing Shield Tunnel below Induced by Quasirectangular Shield Tunneling

, 2023
To use urban underground space more efficiently is a research hotspot of urban underground development. Compared with conventional circular tunnels, quasirectangular tunnels have the characteristics of larger space utilization and higher economic ...
ShengXue Zhu, Kun Zhang, Wei Yin, Kun Hu, Xi Chen   +4 more
core   +1 more source

Oscillator tunneling dynamics in the Rabi model [PDF]

, 2014
Funding support from the National Science Foundation and the Leverhulme Trust is acknowledged.The familiar Rabi model, comprising a two-level system coupled to a quantum harmonic oscillator, continues to produce rich and surprising physics when the ...
Gea-Banacloche, J., Irish, E. K., Twyeffort Irish, E.K.   +2 more
core   +1 more source

A shield tunneling method for enlarging the diameter of existing tunnels: Experimental investigations

, 2022
As for the construction of a metro line, excavated stations usually serve as departure and receiving shafts of the shield tunneling machines, used for drilling of station-to-station tunnels.
Yong Yuan, Zhong-An Zhang, Zhang, Zhong-An, Yi-Min Gao, Zhang, Jiao-Long, Jiao-Long Zhang, Herbert A. Mang, Gao, Yi-Min, Yuan, Yong, Liu, Xian, Xian Liu, Mang, Herbert A.   +11 more
core   +1 more source

Effect of the excavation clearance of an under-crossing shield tunnel on existing shield tunnels

Tunnelling and Underground Space Technology, 2018
Abstract The excavation by earth pressure balance (EPB) shield could cause stress fields varied, which is harmful to adjacent existing structures. Thus the effect of excavation clearance of the EPB shield on the settlement of existing structures should be taken into account.
Minglun Yin, Hua Jiang, Yusheng Jiang, Zhengyang Sun, Quanli Wu   +4 more
openaire   +2 more sources

Fluidization Behavior of Soft Soil Induced by Shield Construction

Applied Sciences, 2021
Shield construction will cause the fluidization of soft soil which is characterized by flow plasticity. This paper presents two theoretical models of soil flow behavior based on a fluid mechanics framework to understand the behavior of soft soil during ...
Hui Jin, Dajun Yuan, Dalong Jin, Shunxin Zhou, Xiaoyu Wang   +4 more
doaj   +1 more source

Numerical Analysis of Shield Tunnelling Breakthrough Working Shaft by Artificial Ground Freezing Method under Extreme Conditions Considering Phase Change Latent Heat

Applied Sciences, 2023
The artificial ground freezing method has been widely used in shield tunneling breakthrough working shafts. The freezing effect was mainly considered in the previous research, and the heat generation of the shield machine was not considered, which has ...
Shengjun Deng, Yang He, Mingqi Yang, Feng Zhou, Heng Liu, Rui Zhu, Zhihui Wan   +6 more
doaj   +1 more source

Unstuck Technology for EPB/TBM Dual Mode Shield Machine Stuck in Rock Stratum

Chengshi guidao jiaotong yanjiu
［Objective］ During the tunneling process of the EPB (earth pressure balance shield machine)/TBM (full-face hard rock tunnel boring machine) dual-mode shield tunneling machine, problems such as excessive wear of the cutting tools and improper setting of ...
DUAN Yueqiang
doaj   +1 more source

Prediction model for disturbance induced by shield tunneling underneath existing tunnels and optimization of tunneling parameters

Yantu gongcheng xuebao
To address the issues of structural damage to existing tunnels and operational safety risks of high-speed railways caused by excessive deformation of high-speed railway tunnels due to shield tunneling underneath, accurate prediction of the maximum ...
FEI Ruizhen 1, 2, SHI Chenghua 2, ZHANG Chunlei 1, LI Jingmei 1
doaj   +1 more source

Influence Factors of Strata Deformation Response Induced by Shield Tunneling in Thick Silty Clay Layer

Chengshi guidao jiaotong yanjiu
[Objective] In thick silty clay layers, the disturbance caused by shield tunneling is affected by multiple factors such as strata conditions and construction parameters.
LI Liang, LU Yong, FAN Cunxin, GUO Bing, ZHU Wenxuan   +4 more
doaj   +1 more source