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RISS 인기검색어
- 검색키워드
- 저자 : Gary Greene, Jr. (검색결과 3 건)
- 무료
- 기관 내 무료
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Crack mapping in RC members using distributed coaxial cable crack sensors: modeling and application
Gary Greene, Jr.,Abdeldjelil Belarbi,Genda Chen 국제구조공학회 2005 Smart Structures and Systems, An International Jou Vol.1 No.4
The paper presents a model to calculate reinforcement strain using measured crack width in members under applied tension, flexure, and/or shear stress. Crack mapping using a new type of distributed coaxial cable sensors for health monitoring of large-scale civil engineering infrastructure was recently proposed and developed by the authors. This paper shows the results and performance of such sensors mounted on near surface of two flexural beams and a large scale reinforced concrete box girder that was subjected to cyclic combined shear and torsion. The main objectives of this health monitoring study was to correlate the sensor response to strain in the member, and show that magnitude of the signal reflection coefficient is related to increases in applied load, repeated cycles, cracking, and reinforcement yielding. The effect of multiple adjacent cracks, and signal loss was also investigated. The results shown in this paper are an important step in using the sensors for crack mapping and determining reinforcement strain for in-situ structures.
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Crack mapping in RC members using distributed coaxial cable crack sensors: modeling and application
Greene, Gary Jr.,Belarbi, Abdeldjelil,Chen, Genda Techno-Press 2005 Smart Structures and Systems, An International Jou Vol.1 No.4
The paper presents a model to calculate reinforcement strain using measured crack width in members under applied tension, flexure, and/or shear stress. Crack mapping using a new type of distributed coaxial cable sensors for health monitoring of large-scale civil engineering infrastructure was recently proposed and developed by the authors. This paper shows the results and performance of such sensors mounted on near surface of two flexural beams and a large scale reinforced concrete box girder that was subjected to cyclic combined shear and torsion. The main objectives of this health monitoring study was to correlate the sensor's response to strain in the member, and show that magnitude of the signal's reflection coefficient is related to increases in applied load, repeated cycles, cracking, and reinforcement yielding. The effect of multiple adjacent cracks, and signal loss was also investigated. The results shown in this paper are an important step in using the sensors for crack mapping and determining reinforcement strain for in-situ structures.
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( Jong Sun Park ),( Jasmine Lee ),( Ram P. Naikawadi ),( Gary Green ),( Paul Wolters ) 대한결핵 및 호흡기학회 2020 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.128 No.-
Purpose Telomere maintenance dysfunction has been implicated in the pathogenesis of idiopathic pulmonary fibrosis (IPF) and short telomere length (TL) is associated with worse survival in IPF. However, it is unknown whether telomere dysfunction is associated with pathogenesis of idiopathic nonspecific interstitial pneumonia (iNSIP). The purpose of this study was to determine whether TL is shortened in alveolar type 2 epithelial (AT2) cells of iNSIP. Methods Idiopathic NSIP were diagnosed at the University of California San Francisco and healthy control lungs were obtained from unused donor lungs. Fluorescence in situ hybridization (FISH) was performed in formalin fixed and paraffin embedded (FFPE) section of lungs. Telomeres were labeled with a telomere-Cy3 PNA probe and AT2 cells were labeled with surfactant protein C (SPC). Telomere fluorescent signal was quantified using the MetaMorph software. Results Age-matched 22 lung tissues (11 iNSIPs, 11 healthy controls) were used to measure TL. Age of the subjects ranges from 31 to 72. Representative FISH images of iNSIP and normal lungs were shown in Figure 1 (A: normal, B:iNSIP). Telomere signal had a tendency to decrease as age increase. However, there was no significant difference in TL of AT2 cells (median FISH-TL signal 11.5 vs. 13.0, p = 0.949) between iNSIP and normal lungs. Conclusion The telomere length was not shorter in the AT2 cells of iNSIP compared to healthy controls. Further study is needed to investigate the role of telomere in iNSIP.
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