Confinement Effects in Protonation Reactions Catalyzed by Zeolites with Large Void Structures

2018 ◽  
Vol 122 (48) ◽  
pp. 27350-27359 ◽  
Author(s):  
M. Fernanda Zalazar ◽  
Néstor Damián Cabral ◽  
Gonzalo D. Romero Ojeda ◽  
Clara Iris Aymará Alegre ◽  
Nélida M. Peruchena
Keyword(s):  
Confinement Effects ◽  
Large Void

scholarly journals Confinement effects for rubberised concrete in tubular steel cross-sections under combined loading

2021 ◽  
Vol 21 (2) ◽  
Author(s):  
A. Mujdeci ◽  
D. V. Bompa ◽  
A. Y. Elghazouli
Keyword(s):  
Axial Compression ◽  
Cross Section ◽  
Cross Sections ◽  
Image Correlation ◽  
Combined Loading ◽  
Test Results ◽  
Compression Tests ◽  
Confinement Effects ◽  
Rubber Content ◽  
Dependent Modification

AbstractThis paper describes an experimental investigation into confinement effects provided by circular tubular sections to rubberised concrete materials under combined loading. The tests include specimens with 0%, 30% and 60% rubber replacement of mineral aggregates by volume. After describing the experimental arrangements and specimen details, the results of bending and eccentric compression tests are presented, together with complementary axial compression tests on stub-column samples. Tests on hollow steel specimens are also included for comparison purposes. Particular focus is given to assessing the confinement effects in the infill concrete as well as their influence on the axial–bending cross-section strength interaction. The results show that whilst the capacity is reduced with the increase in the rubber replacement ratio, an enhanced confinement action is obtained for high rubber content concrete compared with conventional materials. Test measurements by means of digital image correlation techniques show that the confinement in axial compression and the neutral axis position under combined loading depend on the rubber content. Analytical procedures for determining the capacity of rubberised concrete infilled cross-sections are also considered based on the test results as well as those from a collated database and then compared with available recommendations. Rubber content-dependent modification factors are proposed to provide more realistic representations of the axial and flexural cross-section capacities. The test results and observations are used, in conjunction with a number of analytical assessments, to highlight the main parameters influencing the behaviour and to propose simplified expressions for determining the cross-section strength under combined compression and bending.

scholarly journals Non-stackable molecules assemble into porous crystals displaying concerted cavity-changing motions

2021 ◽  
Author(s):  
Taewon Kang ◽  
Hongsik Kim ◽  
Sungeun Jeoung ◽  
Dohyun Moon ◽  
Hoi Ri Moon ◽  
...  
Keyword(s):  
Small Molecules ◽  
Large Void ◽  
Intuitive Design

With small molecules, it is not easy to create large void spaces. Flat aromatics stack tightly, while flexible chains fold to fill the cavities. As an intuitive design to make...

Confinement effects on the structure and dynamics of polymer systems from the mesoscale to the nanoscale

2005 ◽  
Vol 43 (13) ◽  
pp. 1571-1590 ◽  
Author(s):  
M. D. Barnes ◽  
A. Mehta ◽  
P. Kumar ◽  
B. G. Sumpter ◽  
D. W. Noid
Keyword(s):  
Confinement Effects ◽  
Polymer Systems ◽  
Structure And Dynamics

Quantum confinement effects and strain-induced band-gap energy shifts in core-shell Si-SiO2nanowires

2011 ◽  
Vol 83 (24) ◽  
Author(s):  
O. Demichel ◽  
V. Calvo ◽  
P. Noé ◽  
B. Salem ◽  
P.-F. Fazzini ◽  
...  
Keyword(s):  
Band Gap ◽  
Quantum Confinement ◽  
Band Gap Energy ◽  
Core Shell ◽  
Confinement Effects ◽  
Gap Energy ◽  
Quantum Confinement Effects
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