Results 91 to 100 of about 254,698 (314)

Probability prediction of true‐triaxial compressive strength of intact rocks based on the improved PSO‐RVM model

open access: yesDeep Underground Science and Engineering, EarlyView.
In this work, we propose an improved particle swarm optimization (PSO) algorithm and develop an improved PSO‐relevance vector machine (RVM) model as a substitute for traditional true‐triaxial testing. The model's high prediction accuracy was validated through comparisons with two other machine learning methods and five three‐dimensional Hoek–Brown type
Qi Zhang   +4 more
wiley   +1 more source

The Secret

open access: yesThe Journal of Electronic Publishing, 2018
Olsen, Kai, Malizia, Alessio
openaire   +1 more source

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

open access: yesDeep 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   +4 more
wiley   +1 more source

Public Versus Secret Reserve Prices in eBay Auctions: Results from a Pokemon Field Experiment [PDF]

open access: yes
Sellers in eBay auctions have the opportunity to choose both a public minimum bid amount and a secret reserve price. We ask, empirically, whether the seller is made better or worse off by setting a secret reserve above a low minimum bid, versus the ...
Rama Katkar, David Lucking-Reiley
core  

Optimization of cut‐hole layout under high in situ stress based on numerical simulation and field tests

open access: yesDeep Underground Science and Engineering, EarlyView.
This study investigates the blast‐induced rock damage patterns under different cut‐hole layouts and ground stress conditions through numerical simulations and field tests. The findings in this study provide valuable insights for similar underground engineering applications.
Junjie Zhao   +5 more
wiley   +1 more source

"Fondul Secret" după decembrie 1989. [PDF]

open access: yes, 1995
"Fondul Secret" după decembrie 1989.. - In: Fond secret, Fond "S" special : contribuţii la istoria fondurilor secrete de bibliotecă din România : studiu de caz : Biblioteca Centrală Universitară "Lucian Blaga" Cluj-Napoca, an 1995, p.
Radosav, Doru
core  

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