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SUBARU EXPLORATIONS OF EXO-SOLAR PLANETS AND DISKS
TAMURA MOTOHIDE The Korean Astronomical Society 2005 Journal of The Korean Astronomical Society Vol.38 No.2
To date, more than 150 exo-solar planets have been observed by various methods such as spectroscopic, photometric, astrometric, gravitational lensing, pulsar timing methods. However, all these are indirect methods; they do not directly image the planets. Only free-floating planets or their 'ana-log' have been directly detected so far. Thus the next milestone is the direct imaging of any kinds of planetary mass objects orbiting around normal (young) stars, which might have been associated with protoplanetary disks, the sites of planet formation. I will describe some SUBARU efforts to detect self-luminous young giant planets as companions as well as direct imaging of the protoplanetary disks of ${\~}$100 AU size. The results of near-infrared coronagraphic imaging with adaptive optics are briefly presented on AB Aur, HD 142527, T Tau, and DH Tau. Our results demonstrate the importance of high-resolution (${\~}$0.1 arcsec) direct imaging over indirect observations such as modeling based on spectral energy distributions. The SUBARU observations are a prelude to ALMA from the morphological point of view.
Amplitude Dependency of Damping in Buildings and Critical Tip Drift Ratio
Tamura, Yukio Council on Tall Building and Urban Habitat Korea 2012 International journal of high-rise buildings Vol.1 No.1
The importance of appropriate use of damping evaluation techniques and points to note for accurate evaluation of damping are first discussed. Then, the variation of damping ratio with amplitude is discussed, especially in the amplitude range relevant to wind-resistant design of buildings, i.e. within the elastic limit. The general belief is that damping increases with amplitude, but it is emphasized that there is no evidence of increasing damping ratio in the very high amplitude range within the elastic limit of main frames, unless there is damage to secondary members or architectural finishings. The damping ratio rather decreases with amplitude from a certain tip drift ratio defined as "critical tip drift ratio," after all friction surfaces between primary/structural and secondary/non-structural members have been mobilized.
Non-elastic responses of tall steel buildings subjected to across-wind forces
Tamura, Yukio,Yasui, Hachinori,Marukawa, Hisao Techno-Press 2001 Wind and Structures, An International Journal (WAS Vol.4 No.2
This paper presents an analytical method which takes into account the non-linearity of individual members, and discusses some case study results. It also discusses the relationship between member non-elastic behavior and excitation duration, and the relationship between member fracture and overall structure behavior. It is clearly demonstrated that the frame already shows almost unstable behavior due to long-columnization just before the occurrence of a column fracture. Then, a column fracture immediately induces a structural collapse mechanism.
Mucus Plugs and Small Airway Dysfunction in Asthma, COPD, and Asthma-COPD Overlap
Tamura Kanami,Shirai Toshihiro,Hirai Keita,Nakayasu Hiromasa,Takahashi Shingo,Kishimoto Yutaro,Akamatsu Taisuke,Asada Kazuhiro,Kato Satoshi 대한천식알레르기학회 2022 Allergy, Asthma & Immunology Research Vol.14 No.2
Purpose: There are reports concerning mucus plugs detected on high-resolution computed tomography images and airflow obstruction in asthma and chronic obstructive pulmonary disease (COPD). However, little is known about the associations between mucus plugs and small airway dysfunction (SAD). We evaluated the relationship between mucus plugs and pulmonary function in patients with asthma, COPD, and asthma-COPD overlap (ACO), and investigated the relevance to SAD and type 2 inflammation in a retrospective study. Methods: Subjects included 49 asthmatic, 40 ACO, and 41 COPD patients. ACO was diagnosed based on the Japanese Respiratory Society ACO guidelines. Clinical and laboratory parameters, including blood eosinophil count, serum total IgE levels, fractional exhaled nitric oxide (FeNO), spirometry, and forced oscillation technique (FOT), were compared between patients with and without mucus plugs. Results: Mucus plugs were found in 29 (59%) asthmatic, 25 (65%) ACO, 17 (41%) COPD patients. Patients with mucus plugs had reduced spirometry and larger FOT parameters, especially in COPD patients. Mucus scores correlated positively with IgE in ACO and FeNO in asthmatic patients, but not in COPD patients. Multivariate logistic regression analysis revealed that SAD parameters, including forced vital capacity and resonant frequency, a respiratory reactance parameter, were significantly associated with the presence of mucus plugs in the whole studied population. Conclusions: SAD, rather than large airway dysfunction, was associated with mucus plugs in asthma, ACO, and COPD patients.
Aspects of the dynamic wind-induced response of structures and codification
Tamura, Yukio,Kareem, Ahsan,Solari, Giovanni,Kwok, Kenny C.S.,Holmes, John D.,Melbourne, William H. Techno-Press 2005 Wind and Structures, An International Journal (WAS Vol.8 No.4
This paper describes the work of the International Association for Wind Engineering Working Group E -Dynamic Response, one of the International Codification Working Groups set up at the Tenth International Conference on Wind Engineering in Copenhagen. Comparisons of gust loading factors and wind-induced responses of major codes and standards are first reviewed, and recent new proposals on 3-D gust loading factor techniques are introduced. Then, the combined effects of along-wind, crosswind and torsional wind load components are discussed, as well as the dynamic characteristics of buildings. Finally, the mathematical forms of along-wind velocity spectra for along-wind response calculation and codification of acceleration criteria are discussed.
Wind load combinations and extreme pressure distributions on low-rise buildings
Tamura, Yukio,Kikuchi, Hirotoshi,Hibi, Kazuki Techno-Press 2000 Wind and Structures, An International Journal (WAS Vol.3 No.4
The main purpose of this paper is to demonstrate the necessity of considering wind load combinations even for low-rise buildings. It first discusses the overall quasi-static wind load effects and their combinations to be considered in structural design of low-rise buildings. It was found that the maximum torsional moment closely correlates with the maximum along-wind base shear. It was also found that the instantaneous pressure distribution causing the maximum along-wind base shear was quite similar to that causing the maximum torsional moment, and that this asymmetric pressure pattern simultaneously accompanies considerable across-wind and torsional components. Secondly, the actual wind pressure distributions causing maximum quasi-static internal forces in the structural frames are conditionally sampled and their typical pressure patterns are presented.
Environmental Impact Evaluation for Transportation of Building Materials into Tokyo District
Tamura, Masaki,Watanabe, Kyohei,Nachi, Yoko Sustainable Building Research Center 2011 International journal of sustainable building tech Vol.2 No.1
Building materials such as concrete aggregate used in Tokyo district have recently been transported by ship or truck over a long distance with a long transportation time. Therefore, the evaluation of environmental impact from the total amount of building materials and $CO_2$ emissions due to transport of these materials from outside raw material plants to construction sites in the Tokyo district will become an important issue. In this study, the present conditions of transportation loads from building materials for structural bodies such as concrete, its aggregate and so on in the feasiblility study were investigated in consideration of transportation distance (km), total amount of weight (ton) and total number of transportation times (times) from raw material plants to construction sites in the Tokyo district. The environmental impacts of these transportation loads from building materials such as concrete aggregate conveyed into the Tokyo district were evaluated by the indicators of ton-kilometerage ($t{\cdot}km$) and amount of $CO_2$ emissions (t-$CO_2$), comparing transportation by ship and by truck. Moreover, regarding actual buildings recently built in Tokyo, a comparative analysis was conducted in terms of environmental impacts due to transportation loads from ton-kilometerange ($t{\cdot}km$) and amount of $CO_2$ emissions (t-$CO_2$) in consideration of differences between structural body types of reinforced concrete and structure steel.