Water leak diagnosis of tiled roofs under vibration and scattering by wind tunnel experiment
This paper describes a water leak test of roof tiles. The 100 roof tiles were set up on 10 lines and 10 rows on the pitched roof in the downstream of the flow from the wind tunnel. The flow velocity was increased gradually from the low velocity to the high velocity, and the effects of the wind on the roof tiles were investigated by the water leak test. The situation of the water leak test was filmed by video camera. Two accelerometers were simultaneously used. The roof tiles which showed significant vibration at any velocity were found in a series of experiments and the accelerometers were attached to the two neighboring roof tiles on the model roof. The water leak phenomena in the experiment by using the artificial rainfall apparatus are discussed in this paper. Some mechanisms with relatively large amplitudes at low-frequency vibrations, which caused water leak phenomena were made clear.
Extreme wind speeds for various return periods during rainfall
Abstract Extreme wind speeds for various return periods during rainfall at six typical meteorological stations in Japan were estimated using the statistical method for extremes. The annual maximum wind speeds recorded from 1961 to 1980 at these stations were used for analysis. The annual maximum wind speeds were classified according to the amount of precipitation, and they were found to be well modelled by the extreme type-I distribution. Multiple regression analysis employing two parameters, i.e., annual maximum wind speed and hourly precipitation, was used to fit the type-I distribution.
Professional tensions in client-centered practice: using institutional ethnography to generate understanding and transformation.
For almost 20 years, occupational therapists have advocated client-centered practice. Yet client-centered practice is fraught with tensions that arise outside the practice of individual occupational therapists. This paper is guided by two questions: What produces professional tensions in client-centered practice? and What understanding and change might be generated using institutional ethnography? The sociological theory and method of institutional ethnography are described using data from an ongoing investigation of mental health services as a social institution. Illustrated are the research aim, research questions, and institutional analysis that distinguish institutional ethnography from conventional ethnography. Two professional tensions are associated with attempts to fulfill client-centered practice in mental health. One is that of working at cross-purposes with the prevailing hierarchical structure; the other tension is that of being celebrated yet subordinated in the medical and management hierarchies of health services. Although client-centered practice is difficult to do, the authors recommend institutional ethnography as a research approach to generate understanding and transformation of the context and practice of occupational therapy.