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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.
Development of Pipe Inspection Robot using Ring-type Laser
Yasuto Tamura,Ichirota Kanai,Kazuki Yamada,Hun-ok Lim 제어로봇시스템학회 2016 제어로봇시스템학회 국제학술대회 논문집 Vol.2016 No.10
This paper describes the robot capable of inspecting a pipe. The developed robot is composed of three bodies, six legs, a laser range finder, a ring-type laser, and a CCD camera. The six legs are composed of three worm gears that are arranged at an angle of 120 degrees to run inside pipes of different diameters. The robot is designed with two joints to change the direction in pipe junctions, and the robot can measure a fore pipe shape using the laser range finder. The ring-type laser and the CCD camera are installed in the front the robot to detect and evaluate defects of a pipe. The CCD camera takes an image of the ring-type laser light in a pipe, and defects in a pipe are detected and evaluated from a break of the ring-type light by the image processing. We verified the effectiveness of the robot through the movement experiment and the defect inspection experiment.
Akihiro Tamura,Masafumi Kobune,Kazuki Imagawa,Hisashi Oshima,Yusuke Daiko,Atsushi Mineshige,Tetsuo Yazawa,Hiroshi Nishioka,Hironori Fujisawa,Masaru Shimizu,Hideshi Yamaguchi,Koichiro Honda 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.31
3.0-mm-thick a- and b-axis-oriented (Bi_(3.25)Nd_(0.75))Ti_3O_(12) (BNT-0.75) films were fabricated on conductive Nb:TiO_2(101) (Nb = 0, 0.048, 0.46, 0.79 mass%) single crystal substrates by high-temperature sputtering. A BNT films grown on undoped TiO_2 substrates have no orientation, whereas BNT films deposited on Nb:TiO_2 substrates with 0.46-0.79 mass% Nb show strong (h00/0k0) diffractions and grow with a heteroepitaxial relationship to the underlying Nb:TiO_2 substrates. The BNT-0.75 film deposited on Nb:TiO_2(101) substrate with 0.79 mass% Nb was indicated the peculiar shape of approximately 100-150-nm-thick nanoplates. We speculate that the driving force for producing a plate-like structure for BNT films is attributed to the large anisotropy of linear expansion coefficients for Bi_4Ti_3O12, and the comparatively small lattice matching between Nb:TiO_2 substrate and BNT film.
Takashi Tamura,Yasunobu Yamashita,Kazuki Ueda,Yuki Kawaji,Masahiro Itonaga,Shin-ichi Murata,Kaori Yamamoto,Takeichi Yoshida,Hiroki Maeda,Takao Maekita,Mikitaka Iguchi,Hideyuki Tamai,Masao Ichinose,Jun 대한소화기내시경학회 2017 Clinical Endoscopy Vol.50 No.4
Background/Aims: Endoscopic ultrasonography-guided fine-needle aspiration (EUS-FNA) has been used to diagnose gastrointestinal submucosal tumors (SMTs). Although rapid on-site evaluation (ROSE) has been reported to improve the diagnostic accuracy of EUS-FNA for pancreatic lesions, on-site cytopathologists are not routinely available. Given this background, the usefulness of ROSE by endosonographers themselves for pancreatic tumors has also been reported. However, ROSE by endosonographers for diagnosis of SMT has not been reported. The aim of this study was to evaluate the diagnostic accuracy of EUS-FNA with ROSE by endosonographers for SMT, focusing on diagnosis of gastrointestinal stromal tumor (GIST), compared with that of EUS-FNA alone. Methods: Twenty-two consecutive patients who underwent EUS-FNA with ROSE by endosonographers for SMT followed by surgical resection were identified. Ten historical control subjects who underwent EUS-FNA without ROSE were used for comparison. Results: The overall diagnostic accuracy for SMT was significantly higher in cases with than without ROSE (100% vs. 80%, p=0.03). The number of needle passes by FNA with ROSE by endosonographers tended to be fewer, although accuracy was increased (3.3±1.3 vs. 5.9±3.8, p=0.06). Conclusions: ROSE by endosonographers during EUS-FNA for SMT is useful for definitive diagnosis, particularly for GIST.
Yasunobu Yamashita,Kazuki Ueda,Yuki Kawaji,Takashi Tamura,Masahiro Itonaga,Takeichi Yoshida,Hiroki Maeda,Hirohito Magari,Takao Maekita,Mikitaka Iguchi,Hideyuki Tamai,Masao Ichinose,Jun Kato 거트앤리버 소화기연관학회협의회 2016 Gut and Liver Vol.10 No.4
Background/Aims: Transpapillary forceps biopsy is an effective diagnostic technique in patients with biliary stricture. This prospective study aimed to determine the usefulness of the wire-grasping method as a new technique for forceps biopsy. Methods: Consecutive patients with biliary stricture or irregularities of the bile duct wall were randomly allocated to either the direct or wire-grasping method group. In the wiregrasping method, forceps in the duodenum grasps a guidewire placed into the bile duct beforehand, and then, the forceps are pushed through the papilla without endoscopic sphincterotomy. In the direct method, forceps are directly pushed into the bile duct alongside a guide-wire. The primary endpoint was the success rate of obtaining specimens suitable for adequate pathological examination. Results: In total, 32 patients were enrolled, and 28 (14 in each group) were eligible for analysis. The success rate was significantly higher using the wire-grasping method than the direct method (100% vs 50%, p=0.016). Sensitivity and accuracy for the diagnosis of cancer were comparable in patients with the successful procurement of biopsy specimens between the two methods (91% vs 83% and 93% vs 86%, respectively). Conclusions: The wire-grasping method is useful for diagnosing patients with biliary stricture or irregularities of the bile duct wall.
Experimental Study on the Biodegradation Process of Organic Waste in Landfill under Arid Climate
( Hirotaka Momose ),( Tahareh Malmir ),( Kazuki Tamura ),( Yasumasa Tojo ),( Takayuki Matsuo ),( Toshihiko Matsuto ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-
Water plays a key role to the stabilization of waste in landfill. The biodegradation process by the microorganism is indispensable for the stabilization of the organic matter in solid waste, and appropriate moisture is necessary for it. For both wash-off of salts and immobilization of heavy metals by weathering, water is indispensable too. However, under arid climate, evaporation is superior to rainfall. And annual water budget on landfill is likely to be negative. Though the moisture that originates in waste exists immediately after the waste disposal, it is gradually lost because there is little supply with the rainfall water. Therefore, it is difficult to expect various phenomena, which naturally occur in landfill under humid climate such as biodegradation of organic matter, the wash-off of salts and weathering of heavy metals etc., in the municipal solid waste (MSW) landfill located in arid region. In recent years, quantity of MSW has been increasing in developing countries along with their economic growth. The situation is the same in the arid region too. There are many huge landfills at where MSW from the emerging mega-cities is disposed of. Up to now, there are few study in which how the biodegradation of organic matter would progress or what degree the waste stabilization reaches are investigated. In this study, biodegradation of waste was traced by column test of which intensive evaporation occurs. Three experimental conditions were set; namely, 1) only allowing drainage and no water was added, 2) leachate obtained from the column is recirculated, 3) leachate is recirculated at constant quantity by adding water. During two months experimental period, waste showed tendency of drying in each column, and only the acid-genesis occurred. From the viewpoint of carbon release, recirculation condition seems to be favorable for stabilization.
Masafumi Kobune,Hisashi Oshima,Akihiro Tamura,Kazuki Imagawa,Yusuke Daiko,Atsushi Mineshige,Tetsuo Yazawa,Hitoshi Morioka,Keisuke Saito,Hideshi Yamaguchi,Koichiro Honda 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.31
a- and b-axis-oriented (Bi_(3.25)Nd_(0.75))Ti_3O_(12) films, 3.0 mm thick, were fabricated on conductive IrO_2(101)/Al_2O_3(012) and Nb:TiO_2(101) [Nb = 0, 0.05 and 0.79 mass%] substrates by high-temperature sputtering. A BNT film grown on an IrO_2(101)/Al_2O_3(012) substrate had a low crystallinity (2.83˚), a low degree of a- and b-axis orientations [a_((h00/0k0)) = 49.2%] and a dense microstructure that a- and b-axis-oriented crystals existed locally in the film, while a BNT film grown on Nb:TiO_2(101) substrate with 0.79 mass% Nb showed a high crystallinity (0.57˚), a high a_((h00/0k0)) (99.9%) and a porous microstructure that was comprised of many nanoplate-like crystals. It is shown that the BNT film grew with a heteroepitaxial relationship to the underlying Nb:TiO_2 substrate has a symmetric loop shape, with a remanent polarization (2P_r) of 29 mC/cm^2 and a coercive field (2E_c) of 297 kV/cm.
Mitigation of Load Frequency Fluctuation Using a Centralized Pitch Angle Control of Wind Turbines
Junqiao, Liu,Rosyadi, Marwan,Takahashi, Rion,Tamura, Junji,Fukushima, Tomoyuki,Sakahara, Atsushi,Shinya, Koji,Yosioka, Kazuki Journal of International Conference on Electrical 2013 Journal of international Conference on Electrical Vol.2 No.1
In this paper an application of centralized pitch angle controller for fixed speed wind turbines based wind farm to mitigate load frequency fluctuation is presented. Reference signal for the pitch angle of each wind turbine is calculated by using proposed centralized control system based on wind speed information. The wind farm in the model system is connected to a multi machine power system which is composed of 4 synchronous generators and a load. Simulation analyses have been carried out to investigate the performance of the controller using real wind speed data. It is concluded that the load frequency of the system can be controlled smoothly.