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The Biodiversity and School Education : A Study concerning the Significance of the Biodiversity
Get PDFapplication/pdfAuthors have done so far some proposals for environmental issues and education. In this paper, in the first place the writers introduced that “granting service to mankind”, “relationship with people and creatures that exist in rural communities”, and “biodiversity and business activities” are due to our echosystem. What’s more, the writers considered about what is caused by them if the biodiversity will be lost in the future.departmental bulletin pape
Design Method for a Double Spherical Reflector Antenna
Get PDFapplication/pdfI show design method of a double spherical reflector antenna that consists of the main reflector and the sub-reflector that are concentric spherical surface, the additional reflector that removes spherical aberrations, and the primary radiator. First of all, I define the design parameters in order to design the additional reflector that is non-quadratic surface. Next, it is shown for all the design parameters to be unable to design the additional reflector. Finally, the amplitude distribution in the aperture of the main reflector is shown for the reflector system where the additional reflector can exist.departmental bulletin pape
A study on numerical analysis of single story Z-type non-compression braced frame
Get PDFapplication/pdfThe non-compression brace has been investigated and developed as a new earthquake-resistant structural member by the authors. The Z-type brace shows one-side seismic responses of the structure controlled by the function of the wedge-device. In this paper, an anti-symmetric Z-type braced frame subjected to seismic loadings shows torsional vibration. The braced frame in one-directional ground motions can absorb the plastic energy by twisting deformation.departmental bulletin pape
Comparative Study on Required Bit Depth of Gamma Quantization for Digital Cinema using Contrast and Color Difference Sensitivities
Get PDFapplication/pdfA specification for digital cinema systems which deal with movies digitally from production to delivery and projection on the screens is recommended by DCI (Digital Cinema Initiative), and systems based on this specification have been developed and installed in theaters. The parameters of the systems that play an important role in determining image quality include image resolution, quantization bit depth, color space, gamma characteristics, and data compression methods. This paper comparatively discusses a relation between required bit depth and gamma quantization using both of a human visual system for grayscale images and a color difference model for color images. The required bit depth obtained from a contrast sensitivity function against grayscale images monotonically decreases as the gamma value increases, while it has a minimum value when the gamma is 2.9 to 3.0 from CIE 1976 L*a*b* color difference model. It is also shown that the bit depth derived from the contrast sensitivity function is one bit greater than that derived from the L*a*b* color difference model at the gamma value of 2.9.departmental bulletin pape
ON DAMAGED STEEL BUILDINGS DUE TO TSUNAMI AFTER GREAT TOHOKU EARTHQUAKE
Get PDFapplication/pdfA huge disaster due to tsunami occurred on 11th March 2011 in Japan. The tsunami's height reached 14m, and the lower areas of coastal cities and towns were completely wiped out and building functions were lost. Many drowned people have not yet been found. Other great tsunamis are expected in the near future in coastal areas of Japan. Refuges against tsunami must be established immediately in existing buildings to save lives in future tsunamis. Design criteria for tsunami refuges have been published by the Japanese government. However, tsunami loads may have been overestimated in these design criteria. It is very important to correctly estimate tsunami loads for the many tsunami refuges to be constructed. The authors surveyed damaged steel buildings from 7th July to 11th July 2011 to evaluate the tsunami's loading. From the failure mechanism and the member dimensions, the horizontal load could be estimated using plasticity theory. Furthermore, videos of the tsunami on buildings were obtained from Internet media, and the precise flood level of the tsunami could be estimated at the building site. Therefore, valuable observation data of tsunami load could be presented. Two damaged steel buildings were examined, and member dimensions, residual story drift angle, and locations of plastic hinges are discussed. The collapse loads were calculated assuming the yield stress of mild steel and grade of steel. The buildings were located in Kesennuma and Minami-sanriku, Miyagi prefecture, and the flood heights at the buildings were recorded as 5m and 13.5m, respectively. The design and observed horizontal loads were compared. The building frame of Kesennuma was inclined at 1/3 rad in 1st story drift angle and collapsed completely. That of the building frame in Minami-sanriku was inclined at 1/100 rad and maintained its original profile. The tsunami load on these building could be estimated as a hydro pressure against surface of drift direction. The flood height of the load evaluation formula in the design criteria was set to three times the steady state flood level observation to take into account the effect of impact load. It is pointed out that the tsunami load according to the design criteria for the building other than the rim of the coastal area may be overestimated.departmental bulletin pape
The Educational effects of on-site learning for Regional Space Design : From the point of view of Engineering Design
Get PDFapplication/pdfWe started new “Department of Civil Engineering and Urban Design” in 2010. Then we started the new curriculum as well, in which the design training is given. The students who matriculated in 2010 were, in their sophomoreyear, required to take “Urban Design and Information processing” to analyze the space information (three dimensions) from plans (maps=two dimensions) as well as study space design. Experience study” is effective for education which “designing” “planning”and “thinking”. We tried making use of Web system for instructing the students in Design. As a result, they positively participated in the class using Web system. It was also very useful for us to grip how far they were making progress and how well their results got.departmental bulletin pape
On the mathematics education related to the ideal-based zero divisor graphs
Get PDFapplication/pdfLet R be a commutative ring and I be an ideal of R. By S.P. Redmond, the ideal-based zero-divisor graph ΓI(R) is defined by the following statement: the vertices set is a set {x¬ ∈ R − I | xy ∈¬ I for some y ∈ ¬R − I} and the edges set is a set {[x, y]} where [x, y] is an edge such that xy ∈ I for distinct two vertices x and y. Let R = Zn when Z is the integers and (n) is an ideal of Z generated by n. We consider the ideal-based graphs ΓI(Zn) for n = 1, 2, …, 20. In particular, we treat the case that n = pq and p2 where p and q are distinct prime numbers. This graph is easily understand by students. We use the educational diagrams. These results are useful to students.departmental bulletin pape
A Study on the Training of Study Skills : Class Improvement based on Student Class Evaluation
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Optimization of Nutrient Cycling and Balance of Osaka Bay for Coastal Environmental Restoration
Get PDFapplication/pdfOsaka Bay Area metropolitan region exists, the water quality by regulating the amount of inflow loads are being improved. However, an area of sea where closing practices became high over-nutrition in filled land chronically. By the way, Awaji Island of offshore in Osaka Bay and Harimanada has withered laver. Considered the problem of bias in the balance of nutrient cycling in the Bay Area region in addition to the quantitative issues as the cause of this nutrient. In this study, which aims to restore a proper balance of nutrient circulation in the area of Osaka Bay. In the first study, the actual condition and problems of bias and nutrients to build organized in GIS databases. Then, we designed the optimal method for sewage effluent for the purpose of optimizing the balance between nutrient cycling. Finally, we evaluated the effect of forecast measures for the application of numerical analysis. From these findings, in Osaka Bay restore Project have shown that the plan will balance the need for nutrient cycling.departmental bulletin pape
A study of green space ratio and sustainability in a symbiosis area : Regional and environmental effects of Green Infrastructure
Get PDFapplication/pdfGreen Infrastructure is a concept originating in the United States that highlights the importance of the natural environment in decisions about land-use planning. In particular there is an emphasis on the “life support” functions provided by a network of natural ecosystems, with an emphasis on interconnectivity to support long-term sustainability. It is necessary the Green to making of health and nature life at The Residential area in Japan. This study shown that the Green Coverage Ratio in Residential area in Hiroshima, based on the estimation of the vegetation cover ratio and the amount of CO2.departmental bulletin pape