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Wind-induced vibration control of a 200 m-high tower-supported steel stack
Tatsuya Susuki,Naoya Hanada,Shin Homma,Junji Maeda 한국풍공학회 2006 Wind and Structures, An International Journal (WAS Vol.9 No.5
It is well known that cylinder steel stacks are heavily impacted by vortex-induced vibration. However, the wind-induced vibration behaviors of tower-supported steel stacks are not clarified due to a lack of observation. We studied a stack response to strong winds over a long period of time by observing the extreme wind-induced vibration of a 200 m-high tower-supported steel stack. This experiment aimed to identify the wind-induced vibration properties of a tower-supported steel stack and assess the validity of the vibration control method used in the experiment. Results revealed a trend in wind-induced vibration behavior. In turn, an effective measure for controlling such vibration was defined by means of increasing the structural damping ratio due to the effects of the tuned mass damper to dramatically decrease the vortex-induced vibration of the stack.
Yuji Hotta,Naoya Ieda,Ayako Fukamoto,Tomoya Kataoka,Yoshihiro Kawade,Yasuhiro Maeda,Hidehiko Nakagawa,Kazunori Kimura 대한비뇨의학회 2016 Investigative and Clinical Urology Vol.57 No.3
Purpose: To investigate whether relaxation of the rat penile corpus cavernosum could be controlled with NOBL-1, a novel, light-controllable nitric oxide (NO) releaser. Materials and Methods: Fifteen-week-old male Wistar-ST rats were used. The penile corpus cavernosum was prepared and used in an isometric tension study. After noradrenaline (10-5 M) achieved precontraction, the penile corpus cavernosum was irradiated by light (470–500 nm) with and without NOBL-1 (10-6 M). In addition, we noted rats' responses to light with vardenafil (10-6 M), a phosphodiesterase-5 (PDE-5) inhibitor. Next, responses to light in the presence of a guanylate cyclase inhibitor, ODQ (1H-[1,2,4] oxadiazolo[4,3-a]quinoxalin-1-one) (10-5 M), were measured. All measurements were performed in pretreated L-NAME (10-4 M) conditions to inhibit endogenous NO production. Results: Corpus cavernosal smooth muscle, precontracted with noradrenaline, was unchanged by light irradiation in the absence of NOBL-1. However, in the presence of NOBL-1, corpus cavernosal smooth muscle, precontracted with noradrenaline, relaxed in response to light irradiation. After blue light irradiation ceased, tension returned. In addition, the light response was obviously enhanced in the presence of a PDE-5 inhibitor. Conclusions: This study showed that rat corpus cavernosal smooth muscle relaxation can be light-controlled using NOBL-1, a novel, light sensitive NO releaser. Though further in vivo studies are needed to investigate possible usefulness, NOBL-1 may be prove to be a useful tool for erectile dysfunction therapy, specifically in the field of penile rehabilitation.
Homma, Shin,Maeda, Junji,Hanada, Naoya Techno-Press 2009 Wind and Structures, An International Journal (WAS Vol.12 No.4
Many tower-supported steel stacks have been constructed in Japan, primarily for economic reasons. However the dynamic behavior of these stacks under a strong wind is not well known and the wind load design standard for this type of a stack has not yet been formulated. In light of this situation, we carried out wind response observation of an operating tower-supported steel stack with and without a tuned-mass damper. The observation revealed the performance of the tuned-mass damper installed on the stack in order to control the wind-induced vibration. Based on the observed data, we performed a wind tunnel test of a specimen of the stack. In this paper we report the results of the wind tunnel test and some comparisons with the results of observation. Our findings are as follows: 1) the tuned-mass damper installed on the specimen in the wind tunnel test worked as well as the one on the observed stack, 2) the amplitude of the vortex-induced vibration of the specimen corresponded approximately to that of the observed stack, and 3) correlation between Scruton number and reduced amplitude, y/d, (y is amplitude, d is diameter) was confirmed by both the wind tunnel test and the observed results.
( Teppei Komiya ),( Takuma Maeda ),( Yuki Kajino ),( Hirofumi Nakayama ),( Takayuki Shimaoka ),( Takayuki Hirao ),( Shuji Watanabe ),( Makoto Takemoto ),( Naoya Maeda ),( Akiyuki Ukai ),( Fumihiro Kas 한국폐기물자원순환학회(구 한국폐기물학회) 2019 한국폐기물자원순환학회 심포지움 Vol.2019 No.1
Approximately 20% of solid waste in Japan is disposed of at coastal landfill sites. It is an issue that it takes long-term to stabilize coastal landfill sites. Municipal solid waste incineration bottom ash (BA) is one of main wastes landfilled at coastal landfill sites. It is known that finer particles contain more contaminants in BA1), and it was demonstrated that the removal of finer particles from BA produced the lowering pH of leachate as well as the increase of permeability of the landfilled waste layer2). In this study, open channel (OC) classification was focused on as a feasible technique to remove finer particles from BA on a coastal landfill site, and its demonstrational experiment was carried out in order to clarify if the fine particle fraction (d<0.425mm) (FPF) could be removed from BA by OC classification and the settling characteristics of BA in OC. Fig. 1 shows the experimental apparatus. The sea water in a coastal landfill site was pumped up and flowed in OC, and BA is supplied on the surface of the flowing water. After completions of the settling and outflow of BA, saucers on the bottom of OC was collected, and the dry weight and particle size distribution of the BA sediment in each saucer were measured. Table 1 shows the experimental condition. The settling section means the part of OC from the BA supply point to the end of OC. Fig. 2 shows the removal ratio of FPF by OC classification, which is the ratio of the dry weight of FPF in the BA sediment to that in the BA supplied. The largest removal ratio was 61% in Case 3 with the largest water flow velocity and the shortest length of settling section. Fig. 3 shows the median of the settling velocity of BA in OC (MSV) compared with the theoretical settling velocity by Allen’s and Newton’s laws (TSV). The MSV of BA particles greater than 3mm was almost 50% of TSV, and MSV became closer to TSV as BA’s particle size became smaller. The MSV of BA particles with a diameter of 0.425mm was approximately 80% of TSV.
Wind-induced vibration control of a 200 m-high tower-supported steel stack
Susuki, Tatsuya,Hanada, Naoya,Homma, Shin,Maeda, Junji Techno-Press 2006 Wind and Structures, An International Journal (WAS Vol.9 No.5
It is well known that cylinder steel stacks are heavily impacted by vortex-induced vibration. However, the wind-induced vibration behaviors of tower-supported steel stacks are not clarified due to a lack of observation. We studied a stack's response to strong winds over a long period of time by observing the extreme wind-induced vibration of a 200 m-high tower-supported steel stack. This experiment aimed to identify the wind-induced vibration properties of a tower-supported steel stack and assess the validity of the vibration control method used in the experiment. Results revealed a trend in wind-induced vibration behavior. In turn, an effective measure for controlling such vibration was defined by means of increasing the structural damping ratio due to the effects of the tuned mass damper to dramatically decrease the vortex-induced vibration of the stack.
Shin Homma,Junji Maeda,Naoya Hanada 한국풍공학회 2009 Wind and Structures, An International Journal (WAS Vol.12 No.4
Many tower-supported steel stacks have been constructed in Japan, primarily for economic reasons. However the dynamic behavior of these stacks under a strong wind is not well known and the wind load design standard for this type of a stack has not yet been formulated. In light of this situation, we carried out wind response observation of an operating tower-supported steel stack with and without a tuned-mass damper. The observation revealed the performance of the tuned-mass damper installed on the stack in order to control the wind-induced vibration. Based on the observed data, we performed a wind tunnel test of a specimen of the stack. In this paper we report the results of the wind tunnel test and some comparisons with the results of observation. Our findings are as follows: 1) the tuned-mass damper installed on the specimen in the wind tunnel test worked as well as the one on the observed stack, 2) the amplitude of the vortex-induced vibration of the specimen corresponded approximately to that of the observed stack, and 3) correlation between Scruton number and reduced amplitude, y/d, (y is amplitude, d is diameter) was confirmed by both the wind tunnel test and the observed results.
Domain Observation in PIN-PT Mixed Crystal near a Morphotropic Phase Boundary
Naohiko Yasuda,Hidehiro Ohwa,Ikuo Suzuki,Makoto Iwata,Masaki Maeda,Naoya Uemura,Yohachi Yamashita,Yoshihiro Ishibashi 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
Domain structrues in 0:72Pb(In1=2Nb1=2)O3-0.28PbTiO3[0.72PIN-0.28PT]mixed crystal was investigated by a polarized light microscopy. It was found that the (001) plate of 0.72PIN-0.28PT single crystal near a morphotropic phase boundary (MPB) exhibits complex domain structures, which consist of both the rhombohedral and the tetragonal phase intimately mixed together. The change in domain structures, re ecting the successive rhombohedral-tetragonal-cubic phase transition with heating was observed. The temperature dependence of the birefringence in 0.72PIN-0.28PT single crystal near a MPB was also presented. The change in domain structures in the (001) plate of 0.72PIN-0.28PT with the phase transition from rhombohedral to tetragonal ind훔
Shibatani, Saori,Nakanishi, Motohiro,Mizuno, Nobumi,Mishima, Fumihito,Akiyama, Yoko,Okada, Hidehiko,Hirota, Noriyuki,Matsuura, Hideki,Maeda, Tatsumi,Shigemoto, Naoya,Nishijima, Shigehiro The Korea Institute of Applied Superconductivity a 2016 한국초전도저온공학회논문지 Vol.18 No.1
A Superconducting High Gradient Magnetic Separation (HGMS) system is proposed for treatment of feed-water in thermal power plant [1]. This is a method to remove the iron scale from feed-water utilizing magnetic force. One of the issues for practical use of HGMS system is to extend continuous operation period. In this study, we designed the magnetic filters by particle trajectory simulation and HGMS experiments in order to solve this problem. As a result, the quantity of magnetite captured by each filter was equalized and filter blockage was prevented. A design method of the magnetic filter was proposed which is suitable for the long-term continuous scale removal in the feed-water system of the thermal power plant.