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RISS 인기검색어
- 검색키워드
- 저자 : Okahisa, Shunichi (검색결과 5 건)
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Effects of Growth Stage of Bamboo on the Production of Cellulose Nanofibers
Yoko Okahisa,Hiroki Sakata 한국섬유공학회 2019 Fibers and polymers Vol.20 No.8
Bamboo grows widely in zones with a wet season ranging from the tropics to temperate areas and an attractivematerial due to their rapidity of growth. In this study, the possibility of cellulose nanofiber production by applying a mildmechanical treatment to immature bamboo in various stages of lignification was examined. The degree of polymerization andcrystallinity of the cellulose pulp were found to increase with the degree of maturity of the raw bamboo samples. After thefibrillation and filtration, the crystallinity of cellulose sheets obtained from immature bamboo with lower maturation wasincreased. The cellulose nanofiber can be obtained from immature bamboo which contains <10 wt% of lignin by mildmechanical treatment. Moreover, bamboo of this degree of maturity offers advantages over mature bamboo in terms of itsthermal characteristics. Immature bamboo can be a very promising source of raw material for the production of cellulosenanofibers.
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Endoscopic Molecular Imaging: Status and Future Perspective
Naoki Muguruma,Hiroshi Miyamoto,Toshiya Okahisa,Tetsuji Takayama 대한소화기내시경학회 2013 Clinical Endoscopy Vol.46 No.6
During the last decade, researchers have made great progress in the development of new image processing technologies for gastrointestinal endoscopy. However, diagnosis using conventional endoscopy with white light optical imaging is essentially limited, and ultimately, we still rely on the histopathological diagnosis from biopsy specimens. Molecular imaging represents the most novel imaging methods in medicine, and the future of endoscopic diagnosis is likely to be impacted by a combination of biomarkers and technology. Endoscopic molecular imaging can be defined as the visualization of molecular characteristics with endoscopy. These innovations will allow us not only to locate a tumor or dysplastic lesion but also to visualize its molecular characteristics and the activity of specific molecules and biological processes that affect tumor behavior and/or its response to therapy. In the near future, these promising technologies will play a central role in endoluminal oncology.
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Tomoaki Okuda,Tetsuro Yoshida,Yuma Gunji,Shunichi Okahisa,K. Kusdianto,Masao Gen,Seiichi Sato,I. Wuled Lenggoro 한국대기환경학회 2015 Asian Journal of Atmospheric Environment (AJAE) Vol.9 No.2
This study focused on the measurement of the actual charging state of ambient aerosol particles, which is important for understanding the intricate process of adverse health effects caused by particulate matter (PM). The net electrostatic charging state of PM2.5 collected on filter media was measured in this study. The Faraday cage method and surface potential measurements were used in this study. The results showed that the polarities of the net charging state measured using these two methods were in agreement for 42 out of 48 samples (87.5%), and 36 samples (75%) were negatively charged. The filters were not significantly charged by friction between the filters and air not containing PM. Charge addition to or leakage from the filters was not observed over a two-month storage period. Net charging state of PM2.5 collected on the filters was concluded to be negative in most cases, based on data’s support of the assumption that aerosol charging state is not altered by the process of PM collection using filter.
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Okuda, Tomoaki,Yoshida, Tetsuro,Gunji, Yuma,Okahisa, Shunichi,Kusdianto, K.,Gen, Masao,Sato, Seiichi,Lenggoro, I. Wuled Korean Society for Atmospheric Environment 2015 Asian Journal of Atmospheric Environment (AJAE) Vol.9 No.2
This study focused on the measurement of the actual charging state of ambient aerosol particles, which is important for understanding the intricate process of adverse health effects caused by particulate matter (PM). The net electrostatic charging state of $PM_{2.5}$ collected on filter media was measured in this study. The Faraday cage method and surface potential measurements were used in this study. The results showed that the polarities of the net charging state measured using these two methods were in agreement for 42 out of 48 samples (87.5%), and 36 samples (75%) were negatively charged. The filters were not significantly charged by friction between the filters and air not containing PM. Charge addition to or leakage from the filters was not observed over a two-month storage period. Net charging state of $PM_{2.5}$ collected on the filters was concluded to be negative in most cases, based on data's support of the assumption that aerosol charging state is not altered by the process of PM collection using filter.
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Takuya Nakai,Yu Takeda,Saori Niitsu,Yuki Fujihara,Shohei Okahisa,Toshiya Tachibana,Shigeo Fukunishi 대한정형외과학회 2024 Clinics in Orthopedic Surgery Vol.16 No.1
Background: While cementless short stems have become popular in total hip arthroplasty (THA), Metha is a relatively recent development that differs from other short stems in its initial fixation concept of partial collum-sparing metaphyseal anchorage. The purpose of this study was to quantify the contact state between Metha and the femur. Additionally, we investigated the difference in contact points between Meta and Fitmore, which is one of the more popular curved short stems. Methods: We conducted a retrospective review of 42 hips that underwent THA using Metha and 41 hips using Fitmore. Stemto- femur contact was evaluated by density mapping using a three-dimensional digital template system to quantify the contact condition according to the modified Gruen zone. The criterion for the stem-to-bone contact boundary was defined as a computed tomography value of 543 Hounsfield. Results: Quantitative evaluation of Metha according to the modified Gruen zones showed the ratio of surface area with high cortical contact in each zone. The results were 4.6% ± 5.7% in zone 1, 0.9% ± 2.3% in zone 2, 19.1% ± 12.9% in zone 3, 1.4% ± 3.2% in zone 5, 29.6% ± 16.4% in zone 6, and 25.1% ± 17.7% in zones 7. Evaluation of Fitmore for the same zones was as follows: 1.6% ± 2.4%, 18.5% ± 16.9%, 20.8% ± 17.4%, 12.7% ± 12.8%, 3.7% ± 5.8%, and 13.3% ± 10.3%. Comparing the two groups, the contact area was significantly greater for Metha in zones 1, 6 and 7 and Fitmore in zones 2 and 5 (p < 0.05). Conclusions: It is possible for Metha to achieve metaphyseal anchoring by contacting the cortical bone at the proximal femur, thus avoiding proximal offloading. To the best of our knowledge, no previous studies have quantitatively reported stem-to-cortical bone contact conditions in curved short stems.
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