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Damage assessment of a gradually damaged prestressed concrete bridge using static load tests and non-linear vibration characteristic KU Leuven
The detection of damage in bridges is mainly done by visual examination. However, defects as for instance partial rupture of a prestressing cable cannot be visually observed. It is well known that damage changes dynamic structural parameters like eigenfrequencies, modeshapes and damping. Since the sensitivity of changes in modal properties is sometimes low, this paper presents an approach that makes use of non-linear dynamic behaviour. The basic ...
Changes of UV Optical Properties of Plasma Damaged Low-k Dielectrics for Sidewall Damage Scatterometry KU Leuven
Porous low-k dielectrics were studied to determine the changes of optical properties after various plasma treatments for development of scatterometry technique for evaluation of the trench/via sidewall plasma damage. The SiCOH porogen based low-k films were prepared by PECVD. The deposited and UV-cured low-k films have been damaged by striping O2Cl2, O2, NH3 and H2N2 based plasmas and CF4/CH2F2/Ar etching plasma. Blanket wafers were studied in ...
Probabilistic damage assessment based on measured vibration data from a progressively damaged beam KU Leuven
A chimp optimization algorithm (ChOA) for vibration-based damage detection of a damaged steel truss Ghent University
Mitochondrial DNA damage analysis in bronchoalveolar lavage cells of preterm infants. KU Leuven
In mechanically ventilated preterm infants, the combination of immaturity, volutrauma, oxidative stress, and inflammatory processes can lead to chronic lung injury. Mitochondrial DNA (mtDNA) is more susceptible to oxidative damage than nuclear DNA. We aimed to investigate the level of mtDNA damage (deletions, mutations and changes in copy number) in bronchoalveolar lavage (BAL) cells from 10 preterm infants (27-30 weeks). A first BAL (BAL1) was ...
Preterm newborns show slower repair of oxidative damage and paternal smoking associated DNA damage Vrije Universiteit Brussel
Newborns have to cope with hypoxia during delivery and a sudden increase in oxygen at birth. Oxygen will partly be released as reactive oxygen species having the potential to cause damage to DNA and proteins. In utero, increase of most (non)-enzymatic antioxidants occurs during last weeks of gestation, making preterm neonates probably more sensitive to oxidative stress. Moreover, it has been hypothesized that oxidative stress might be the common ...
Experimental and numerical fatigue damage characterization in multidirectional thermoplastic glass/polypropylene laminates based on in-situ damage observations Ghent University
Quantifying microscopic damage mechanisms in opaque composite laminates with multiple off-axis plies throughout fatigue experiments is challenging. However, if successful, important relations can be revealed be-tween actual evolving damages and their contribution to the mechanical laminate response. This study characterizes the evolution of matrix cracking in +/- 45 and 90 embedded off-axis plies together with effects of delamination and relates ...