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2,946 results on '"Ogawa, Hiroshi"'

3. Measurement of radon emanation and impurity adsorption from argon gas using ultralow radioactive zeolite

Author

Ogawa, Hiroshi, Iyoki, Kenta, Matsukura, Minoru, Wakihara, Toru, Abe, Ko, Miuchi, Kentaro, and Umehara, Saori

Subjects
Physics - Instrumentation and Detectors
Abstract

The amount of radioactive impurities contaminated in the detector gases is required to be kept at a very low level for rare event particle physics such as dark matter and neutrino observation experiments. Zeolite is a well-known class of materials and is one of the possible candidates for removing impurities from these gases. At the same time, the amount of radioactive impurities released from the adsorbent material needs to be sufficiently small. In this paper, a development of a new ultralow radioactive zeolite as a product of the selection of ultralow radioactive materials is reported. Results on the radon emanation and impurity adsorption from argon gas measurements are also described., Comment: 11 pages, 9 figures

Published
2022

4. The development of radioactivity measurement system in gases

Author

Ogawa, Hiroshi

Subjects
Physics - Instrumentation and Detectors
Abstract

A device for measuring radioactive impurities in gas is developed, consisting of an electrostatic collection type radon detector and an extremely low radioactivity proportional counter. This device measures the radioactive impurities released by materials into the gas and a filtering test for radon removal from gas. The performance of the newly developed proportional counter was evaluated by measuring radon rate. The calibration factor of $^{222}$Rn as 27.4$\pm$0.2~count/day/mBq and the background rate of $^{222}$Rn as 0.84$\pm$0.13~mBq were estimated., Comment: 7 pages, 5 figures

Published
2022

20. Ten years' evaluation of periodontal status and its changes among Japanese older adults.

Author

Chairunisa, Fania, Widita, Elastria, Thwin, Kaung Myat, Takehara, Sachiko, Nohno, Kaname, Hanindriyo, Lisdrianto, Miyazaki, Hideo, and Ogawa, Hiroshi

Subjects
OLDER people, PERIODONTAL pockets, TOOTH loss, PERIODONTAL disease, GINGIVA
Abstract

Aims: This study aims to evaluate the periodontal status and its changes among Japanese older adults over a 10‐year period. Methods and results: A total of 206 dentate older adults aged 70 years who completely participated in 10 years of oral examination were included. The community periodontal index (CPI) was used to assess the gingival and periodontal pocket status, while the loss of attachment (LA) scoring system was used to report the extensive LA. A higher score in CPI (Code 3 and Code 4) and more extensive attachment loss were found in a majority of participants. During follow‐up evaluation, mean number of sextants with CPI code 4 remained stable, while CPI code 3 significantly decreased particularly in male participants. Whereas, sextants without attachment loss significantly decreased on average. The mean number of missing sextants significantly increased from 1.1 to 1.9, and 5.8% of subjects had all sextants excluded in the follow‐up. Conclusion: This study indicated that majority of the older people experienced severe periodontal disease and this condition remained stable during 10‐year period. Additionally, the incidence of tooth loss increased as individuals aged. Regular oral care and maintenance are highly recommended for older population. [ABSTRACT FROM AUTHOR]

Published
2024
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22. Age-stratified and blood-pressure-stratified effects of blood-pressure-lowering pharmacotherapy for the prevention of cardiovascular disease and death: an individual participant-level data meta-analysis

Author

Rahimi, Kazem, Bidel, Zeinab, Nazarzadeh, Milad, Copland, Emma, Canoy, Dexter, Wamil, Malgorzata, Majert, Jeannette, McManus, Richard, Adler, Amanda, Agodoa, Larry, Algra, Ale, Asselbergs, Folkert W, Beckett, Nigel S, Berge, Eivind, Black, Henry, Boersma, Eric, Brouwers, Frank P J, Brown, Morris, Brugts, Jasper J, Bulpitt, Christopher J, Byington, Robert P, Cushman, William C, Cutler, Jeffrey, Devereaux, Richard B, Dwyer, Jamie P, Estacio, Ray, Fagard, Robert, Fox, Kim, Fukui, Tsuguya, Gupta, Ajay K, Holman, Rury R, Imai, Yutaka, Ishii, Masao, Julius, Stevo, Kanno, Yoshihiko, Kjeldsen, Sverre E, Kostis, John, Kuramoto, Kizuku, Lanke, Jan, Lewis, Edmund, Lewis, Julia B, Lievre, Michel, Lindholm, Lars H, Lueders, Stephan, MacMahon, Stephen, Mancia, Giuseppe, Matsuzaki, Masunori, Mehlum, Maria H, Nissen, Steven, Ogawa, Hiroshi, Ogihara, Toshio, Ohkubo, Takayoshi, Palmer, Christopher R, Patel, Anushka, Pfeffer, Marc Allan, Pitt, Bertram, Poulter, Neil R, Rakugi, Hiromi, Reboldi, Gianpaolo, Reid, Christopher, Remuzzi, Giuseppe, Ruggenenti, Piero, Saruta, Takao, Schrader, Joachim, Schrier, Robert, Sever, Peter, Sleight, Peter, Staessen, Jan A, Suzuki, Hiromichi, Thijs, Lutgarde, Ueshima, Kenji, Umemoto, Seiji, van Gilst, Wiek H, Verdecchia, Paolo, Wachtell, Kristian, Whelton, Paul, Wing, Lindon, Woodward, Mark, Yui, Yoshiki, Yusuf, Salim, Zanchetti, Alberto, Zhang, Zhen-Yu, Anderson, Craig, Baigent, Colin, Brenner, Barry Morton, Collins, Rory, de Zeeuw, Dick, Lubsen, Jacobus, Malacco, Ettore, Neal, Bruce, Perkovic, Vlado, Rodgers, Anthony, Rothwell, Peter, Salimi-Khorshidi, Gholamreza, Sundström, Johan, Turnbull, Fiona, Viberti, Giancarlo, Wang, Jiguang, Chalmers, John, Davis, Barry R, Pepine, Carl J, and Teo, Koon K

Published
2021
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30. Which modality is better to diagnose high-grade transformation in retroperitoneal liposarcoma? Comparison of computed tomography, positron emission tomography, and magnetic resonance imaging

Author

Nakashima, Yu, Yokoyama, Yukihiro, Ogawa, Hiroshi, Sakakibara, Ayako, Sunagawa, Masaki, Nishida, Yoshihiro, Mizuno, Takashi, Yamaguchi, Junpei, Onoe, Shunsuke, Watanabe, Nobuyuki, Kawakatsu, Shoji, Igami, Tsuyoshi, Ebata, Tomoki, Nakashima, Yu, Yokoyama, Yukihiro, Ogawa, Hiroshi, Sakakibara, Ayako, Sunagawa, Masaki, Nishida, Yoshihiro, Mizuno, Takashi, Yamaguchi, Junpei, Onoe, Shunsuke, Watanabe, Nobuyuki, Kawakatsu, Shoji, Igami, Tsuyoshi, and Ebata, Tomoki

Abstract

Background: Survival in patients with retroperitoneal liposarcoma (RPLS) depends on the surgical management of the dedifferentiated foci. The present study investigated the diagnostic yield of contrast-enhanced CT, 18F-fluorodeoxyglucose positron emission tomography (PET), and diffusion-weighted MRI in terms of dedifferentiated foci within the RPLS. Methods: Patients treated with primary or recurrent RPLS who underwent the above imaging between January 2010 and December 2021 were retrospectively reviewed. The diagnostic accuracy of the three modalities for histologic subtype of dedifferentiated liposarcoma (DDLS) and French Federation of Cancer Center (FNCLCC) grade 2/3 were compared using receiver operating characteristic curves and areas under the curves (AUCs). Results: The cohort involved 32 patients with 53 tumors; 30 of which exhibited DDLS and 31 of which did FNCLCC grades 2/3. The optimal thresholds for predicting DDLS were mean CT value of 31 Hounsfield Unit (HU) (AUC = 0.880, 95% CI 0.775–0.984; p < 0.001), maximum standardized uptake value (SUVmax) of 2.9 (AUC = 0.865 95% CI 0.792–0.980; p < 0.001), while MRI failed to differentiate DDLS. The cutoff values for distinguishing FNCLCC grades 1 and 2/3 were a mean CT value of 24 HU (AUC = 0.858, 95% CI 0.731–0.985; p < 0.001) and SUVmax of 2.9 (AUC = 0.885, 95% CI 0.792–0.978; p < 0.001). MRI had no sufficient power to separate these grades. Conclusions: Contrast-enhanced CT and PET were useful for predicting DDLS and FNCLCC grade 2/3, while MRI was inferior to these two modalities.

Published
2024

33. Low Salivary IgA Levels Against PAc (361–386) as a Risk Factor for Root Caries in Older Adults.

Author

Ichikawa, Yu, Kaneko, Noboru, Thwin, Kaung Myat, Senpuku, Hidenobu, Nohno, Kaname, and Ogawa, Hiroshi

Subjects
OLDER people, DENTAL caries, AMINO acid residues, ENZYME-linked immunosorbent assay, MANN Whitney U Test, STREPTOCOCCUS mutans
Abstract

Objectives: This study aimed to assess the intricate relationship between salivary IgA antibody levels to PAc (361–386) (PPA), mutans streptococci colonization, and root caries development in older adults. Materials and Methods: This study included 307 participants aged 76 years residing in Niigata city, Japan. Clinical oral examinations were performed at baseline in 2004 and 1 year later, during which the total number of untreated and treated root caries was assessed using the root decayed, filled tooth (DFT) index. The stimulated saliva samples were collected using the spitting method during the baseline survey. Salivary IgA antibody levels to amino acid residues 361–386 of Streptococcus mutans PAc were quantified using an enzyme‐linked immunosorbent assay. Statistical analyses, including the χ2 test, Mann–Whitney U test, and logistic regressions, were performed to examine the association of increased root DFT with the independent variables. Results: Among the 307 participants (53.1% men), the mean root DFT at baseline was 3.77 ± 3.66, and 36.5% of the study sample exhibited increased root DFT after 1 year with a mean increment of 0.36 ± 0.48. Participants with increase in root DFT after 1 year had significantly higher rates of low PPA levels (≤ 25th percentile) than those without increased root DFT (p = 0.020). Low PPA levels (≤ 25th percentile) were significantly more likely to have an increased risk of root caries development compared with PPA levels > 25th percentile (adjusted OR: 1.88, 95% CI: 1.09–3.25). Conclusion: Low PPA levels and root caries incidence correlated significantly, suggesting that low levels of salivary IgA antibody to PAc (361–386) may serve as a risk factor for increased root caries in older adults. [ABSTRACT FROM AUTHOR]

Published
2024
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40. Design and construction of an electron accelerator for a pulsed neutron facility at AIST

Author

O'Rourke, Brian E., Fujiwara, Takeshi, Furukawa, Kazuro, Furusaka, Michihiro, Hayashizaki, Noriyosu, Kato, Hidetoshi, Kino, Koichi, Kuroda, Ryunosuke, Michishio, Koji, Muroga, Takemi, Nigorikawa, Kazuyuki, Obina, Takashi, Ogawa, Hiroshi, Oshima, Nagayasu, Satoh, Daisuke, Sei, Norihiro, Shishido, Tamao, Suzuki, Ryoichi, Tanaka, Masahito, Tomota, Yo, Toyokawa, Hiroyuki, and Watazu, Akira

Published
2020
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