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RISS 인기검색어
- 검색키워드
- 저자 : Ishigaki, Aya (검색결과 87 건)
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LINE-OF-SIGHT VELOCITY AND METALLICITY MEASUREMENTS OF THE PALOMAR 5 TIDAL STREAM
Ishigaki, M. N.,Hwang, N.,Chiba, M.,Aoki, W. American Astronomical Society 2016 The Astrophysical journal Vol.823 No.2
<P>We present Subaru/Faint Object Camera and Spectrograph and Keck/Deep Imaging Multi-Object Spectrometer medium-resolution spectroscopy of a tidally disrupting Milky Way (MW) globular cluster Palomar 5 (Pal 5) and its tidal stream. The observed fields are located to cover an angular extent of similar to 17 degrees along the stream, providing an opportunity to investigate a trend in line-of-sight velocities (V-los) along the stream, which is essential to constrain its orbit and underlying gravitational potential of the MW's dark matter halo. A spectral fitting technique is applied to the observed spectra to obtain stellar parameters and metallicities ([Fe/H]) of the target stars. The 19 stars most likely belonging to the central Pal 5 cluster have a mean V-los of -58.1 +/- 0.7 km s(-1) and metallicity [Fe/H] = -1.35 +/- 0.06 dex, both of which are in good agreement with those derived in previous high-resolution spectroscopic studies. Assuming that the stream stars have the same [Fe/H] as the progenitor cluster, the derived [Fe/H] and V-los values are used to estimate the possible V-los range of the member stars at each location along the stream. Because of the heavy contamination of the field MW stars, the estimated V-los range depends on prior assumptions about the stream's V-los, which highlights the importance of more definitely identifying the member stars using proper motion and chemical abundances to obtain unbiased information of V-los in the outer part of the Pal 5 stream. The models for the gravitational potential of the MW's dark matter halo that are compatible with the estimated V-los range are discussed.</P>
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Ishigaki Kazunaga,Nakai Yousuke,Oyama Hiroki,Kanai Sachiko,Suzuki Tatsunori,Nakamura Tomoka,Sato Tatsuya,Hakuta Ryunosuke,Saito Kei,Saito Tomotaka,Takahara Naminatsu,Hamada Tsuyoshi,Mizuno Suguru,Kogu 거트앤리버 소화기연관학회협의회 2020 Gut and Liver Vol.14 No.6
Background/Aims: Recently, a three-plane symmetric needle with Franseen geometry was developed for endoscopic ultrasound-guided fine needle biopsy (EUS-FNB). In this retrospective study, tissue acquisition per pass was compared between 22-gauge Franseen FNB and standard fine needle aspiration (FNA) needles in patients with solid pancreatic lesions. Methods: Consecutive patients who underwent EUSFNA or EUS-FNB for solid pancreatic lesions between October 2014 and March 2018 were retrospectively studied. The tissue acquisition rate and the diagnostic performance per session, per pass, and at first pass were compared. Results: A total of 663 passes (300 by the FNB needle and 363 by the standard FNA needle) were performed in 154 patients (71 FNB and 83 FNA). The tissue acquisition rate per session and at first pass in the FNB and FNA groups was 100% and 95% (p=0.13) and 87% and 69% (p=0.007), respectively. The multivariate analysis revealed that among the patients, EUS-FNB (odds ratio, 3.07; p=0.01) was associated with a higher first-pass tissue acquisition rate. While the tissue acquisition rate reached a plateau after the 4th pass with FNA, it reached a plateau after the 2nd pass with FNB. Among the 129 malignant cases, the histological tissue acquisition rate per session was similar (100% and 94%), but the sensitivity by histology alone per session was higher for FNB than for FNA (93% and 73%, p<0.01). Conclusions: The results of our retrospective analysis indicated that compared with a standard FNA needle, a 22-gauge Franseen FNB needle was associated with a higher first-pass tissue acquisition rate.
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Ishigaki, Genki,Nitthaisong, Pattama,Prasojo, Yogi Sidik,Kobayashi, Ikuo,Fukuyama, Kiichi,Rahman, Mohammad Mijanur,Akashi, Ryo Asian Australasian Association of Animal Productio 2018 Animal Bioscience Vol.31 No.5
Objective: The preference evaluation of cattle is an important factor for estimation and improvement of the grazing amounts of newly introduced or bred grasses or cultivars in barn. This study was performed to assess the grazing behavior (the amount of grazing and/or the grazing speed) of cattle as indirect method using newly bred Brachiaria ruziziensis tetraploid strain 'OKI-1'(BR) hay as treatment group and Cloris gayana 'Callide' (CG) hay as control group. It also compared the feasibility of using behavioral differences between two groups as one criteria for evaluating preference by Japanese black cattle in barn. Methods: Three experiments were carried out using 12 growing Japanese Black cattle including 6 males and 6 females. In each experiment, the four Japanese Black cattle (2 males and 2 females) were placed in separated stall and allowed to graze BR and CG in manger that was separated into two portions for about 30 min. The position and behavior of the cattle were recorded, and weighed the residual of each gay at 15 and 30 minutes after experiment start. Results: The BR was superior to CG in chemical composition such as protein, fibers and non-fibrous carbohydrate. The cattle, over all, tended to prefer BR over CG in the first half 15 minutes in terms of the time spent and amount of grazing. Additionally, growing cattle exhibited neophilia for BR bred newly. Conclusion: These findings indicated the current approach could be applied for one of criteria to evaluate the preference of hay by Japanese black cattle under indoor housing environment.
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Potential of Anaerobic Biological Gas Generation of Waste in the Landfill under Post Closure Care
Tomonori Ishigaki,Masahiro Sato,Kazuto Endo,Masato Yamada,Hiroyuki Ishimori 한국폐기물자원순환학회 2013 한국폐기물자원순환학회 학술대회 Vol.2013 No.2
Stabilization of landfill gas (LFG) generation is recognized as the critical indicator to evaluate the future possibility of environmental impact from the waste landfill. In comparison with leachate quality, the amount of LFG generation is considered more difficult to integrate the sequential monitoring results. Spatially and temporal high variation of the LFG generation and the emission would be influenced by the micrometeorological condition. One of the helpful information to predict the behavior of LFG generation is to estimate the remaining of LFG source in the waste. Biological degradation should decrease the amount of component that should be transformed LFG in the waste. Hence, the LFG generation potential of waste in landfill must be gradually decreased as time goes on. In order to support the assessment of the landfill stability from the viewpoint of LFG, the estimation of the potential of LFG generation of the landfilled waste has been investigated at the landfills that was received the waste incineration ash, slag, C&D inert residue, dredged soil, and so on. The LFG emission behavior has been predicted by using the remaining LFG potential, and it was validated by the investigation of surface LFG emission. Degraded organics by anaerobic incubation had been calculated by Buswell's theoretical equation (Bockreis, et al. 2007). Objected samples that were excavated from 10-15 years old waste layer have shown the little potential of LFG generation (Table 1). A highest content of gasified organics was observed for 2.0m depth of C10 though it was less than 1% of the total weight of sample (dry weight). It would be strongly attributed to intensive pretreatment of waste before the landfilling. Since the landfill operator required the strict quality control for the waste to be disposed of, the content of organics in the waste should be enough low at the initial phase of landfill management. In addition, the effort of the landfill management to promote the biodegradation, such as the lowering of the water level in landfill layer, or ventilation of LFG, had contributed to reduce the biodegradable organics. Fig.1 shows the prediction of methane emission from the landfill. It also exhibited results of investigation of surface LFG emission. The prediction of landfill methane emission was developed by using the parameter that was obtained from excavated waste.
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Concept of Appropriate Treatment of Captured Wildlife in Conjunction with Waste Treatment System
( Tomonori Ishigaki ),( Satoru Ochiai ),( Masahiro Osako ),( Masato Yamada ) 한국폐기물자원순환학회(구 한국폐기물학회) 2016 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2016 No.-
In recent years in Japan, populations of wildlife such as Japanese deer and wild boars are rapidly increasing with the expansion of their habitats, which has caused serious damage to the ecosystem, agriculture, forestry, fisheries, and the living environment. Since the substantial treatment policy of captured wildlife as not been decided, hunting plan has not been implemented in most of municipality. In order to remove the influence on natural and living environment, the comprehensive management system on captured wildlife, as well as the infected livestock or radioactively polluted animals, must be established. Captured wildlife in local municipalities have not been well managed in the context of the waste management, and there are lots of issues to be solved such as the logistics from hunting zone to public road network, transportation to waste treatment facility, capacity of the municipal incinerators, safety management of disposal. Integrated management of captured wildlife would be achieved by sophisticated cooperation of the sectors of wildlife control and waste management, and a smooth connection to the existing waste management system must be a key issue on this cross-sectional implementation of the project. The Ministry of the Environment, Japan has given the target of the reduction of the number of the hunted designated species (Japanese deer and wild boar) to be double in comparison with that in FY2012. It would be estimated approximately two million, and more than 150 thousand tonnes of dead animal should be annually treated in waste facility additionally. This is a national target, but treatment duty will be owed by local municipalities. This study is going to elucidate the structure of technical problem on receiving the captured large wildlife at the municipal waste treatment facilities, and to investigate the smooth connection to existing waste management system in local scale. Case study of the logistical simulation of the treatment of a mass of livestock that died by natural disasters in local waste management system revealed that the necessity of pretreatment as volume reduction of the dead animals for transportation and for incineration. The pretreatment at hunting-scene will contribute to reduce the total efforts and costs for transportation though there are some technological and legal limitations in Japan. Central pretreatment should be more attractive and reasonable way of volume reduction of hunted wildlife to connect to the existing municipal waste management system.
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