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오늘 본 자료
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Capillary Electrophoresis and Molecular Modeling as a Complementary Technique for Chiral Recognition Mechanism
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포털 실시간 검색어 영향력이 사용자에게 미치는 영향 연구
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Free vibration of symmetric angle ply truncated conical shells under different boundary conditions using spline method
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Phosphorylated BRCA1 Is Predominantly Located in the Nucleus and Mitochondria
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Loss of the glucocorticoid receptor in zebrafish improves muscle glucose availability and increases growth
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DEMOGRAPHY OF SLOAN DIGITAL SKY SURVEY EARLY-TYPE GALAXIES FROM THE PERSPECTIVE OF RADIAL COLOR GRADIENTS
- 검색키워드
- 저자 : Cascante, Giovanni (검색결과 4 건)
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Ultrasonic characterization of exhumed cast iron water pipes
Groves, Paul,Cascante, Giovanni,Knight, Mark Techno-Press 2011 Smart Structures and Systems, An International Jou Vol.7 No.4
Cast iron pipe has been used as a water distribution technology in North America since the early nineteenth century. The first cast iron pipes were made of grey cast iron which was succeeded by ductile iron as a pipe material in the 1940s. These different iron alloys have significantly different microstructures which give rise to distinct mechanical properties. Insight into the non-destructive structural condition assessment of aging pipes can be advantageous in developing mitigation strategies for pipe failures. This paper examines the relationship between the small-strain and large-strain properties of exhumed cast iron water pipes. Nondestructive and destructive testing programs were performed on eight pipes varying in age from 40 to 130 years. The experimental program included microstructure evaluation and ultrasonic, tensile, and flexural testing. New applications of frequency domain analysis techniques including Fourier and wavelet transforms of ultrasonic pulse velocity measurements are presented. A low correlation between wave propagation and large-strain measurements was observed. However, the wave velocities were consistently different between ductile and grey cast iron pipes (14% to 18% difference); the ductile iron pipes showed the smaller variation in wave velocities. Thus, the variation of elastic properties for ductile iron was not enough to define a linear correlation because all the measurements were practically concentrated in single cluster of points. The cross-sectional areas of the specimens tested varied as a result of minor manufacturing defects and levels of corrosion. These variations affect the large strain testing results; but, surface defects have limited effect on wave velocities and may also contribute to the low correlations observed. Lamb waves are typically not considered in the evaluation of ultrasonic pulse velocity. However, Lamb waves were found to contribute significantly to the frequency content of the ultrasonic signals possibly resulting in the poor correlations observed. Therefore, correlations between wave velocities and large strain properties obtained using specimens manufactured in the laboratory must be used with caution in the condition assessment of aged water pipes especially for grey cast iron pipes.
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Ultrasonic characterization of exhumed cast ironwater pipes
Paul Groves,Giovanni Cascante,Mark Knight 국제구조공학회 2011 Smart Structures and Systems, An International Jou Vol.7 No.4
Cast iron pipe has been used as a water distribution technology in North America since the early nineteenth century. The first cast iron pipes were made of grey cast iron which was succeeded by ductile iron as a pipe material in the 1940s. These different iron alloys have significantly different microstructures which give rise to distinct mechanical properties. Insight into the non-destructive structural condition assessment of aging pipes can be advantageous in developing mitigation strategies for pipe failures. This paper examines the relationship between the small-strain and large-strain properties of exhumed cast iron water pipes. Nondestructive and destructive testing programs were performed on eight pipes varying in age from 40 to 130 years. The experimental program included microstructure evaluation and ultrasonic, tensile, and flexural testing. New applications of frequency domain analysis techniques including Fourier and wavelet transforms of ultrasonic pulse velocity measurements are presented. A low correlation between wave propagation and large-strain measurements was observed. However, the wave velocities were consistently different between ductile and grey cast iron pipes (14% to 18% difference); the ductile iron pipes showed the smaller variation in wave velocities. Thus, the variation of elastic properties for ductile iron was not enough to define a linear correlation because all the measurements were practically concentrated in single cluster of points. The cross-sectional areas of the specimens tested varied as a result of minor manufacturing defects and levels of corrosion. These variations affect the large strain testing results; but, surface defects have limited effect on wave velocities and may also contribute to the low correlations observed. Lamb waves are typically not considered in the evaluation of ultrasonic pulse velocity. However, Lamb waves were found to contribute significantly to the frequency content of the ultrasonic signals possibly resulting in the poor correlations observed. Therefore, correlations between wave velocities and large strain properties obtained using specimens manufactured in the laboratory must be used with caution in the condition assessment of aged water pipes especially for grey cast iron pipes.
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이재호,David Matarrita-Cascante 한국관광학회 2013 International Journal of Tourism Sciences Vol.13 No.2
The notion of place has been discussed within many different fields. Nonetheless, not many conversations are happening between the different fields that study this concept. This has resulted in the creation of a body of knowledge that, on instances, tend to be secluded from the knowledge created in other fields. Among them, the gap between planners and sociologists is significant. For instance, only a small number of planning articles mention the human/emotional connections to place, while sociologists often overlook the potential contribution of the physical environment in their observations. In here we propose an integrated framework that includes these two fields. We provide insights into why these two fields think differently about place and why we need an incorporated framework of place by indicating the strength and shortcomings of each field. Furthermore, we will extend this framework to the context of tourism-dependent communities to suggest how this concept can be applied in the tourism sector. Throughout this framework, we may better understand the importance of the social and physical aspects in community and facilitate them in planning processes and in sociological research. This holistic view will not only be beneficial to residents but also to tourists as well.
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[‘코스타리카 지식다이얼로그 국제세미나’] 한-코스타리카 도시, 환경 및 에너지 분야 지식공유를 통한 협력기반 구축
서병권(편집자),로라 리자노(Laura Lizano),안지운,구자춘,아드리아나 샤콘 까스칸테(Adriana Chacon-Cascante),로센도 메사예스 푸홀(Rosendo Mesalles Pujol),민성희,레오나르도 메리노 트레호스(Leonardo Merino Trejos),이스마엘 마일리 곤잘레스(토론자),정일호(토론자),김동주(토론자) 국토연구원 2016 국토 : planning and policy Vol.413 No.-
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