著者
星野 直 石原 唯史 岡田 広 松永 綾子 粒良 昌弘 田邉 良 木村 翔 石和田 稔彦 中島 弘道
出版者
一般社団法人 日本感染症学会
雑誌
感染症学雑誌 (ISSN:03875911)
巻号頁・発行日
vol.97, no.1, pp.18-25, 2023-01-20 (Released:2023-01-20)
参考文献数
22

千葉県小児災害対策ネットワーク参加施設(38医療機関,県内の全2次医療圏をカバー)を対象に,千葉県の小児新型コロナウイルス感染症(coronavirus disease 2019:COVID-19)入院例について後方視的に検討した.流行第1波~第5波(2020年3月~2021年12月)は観察研究で集計した155例(年齢中央値6歳10カ月)を,第6波(2022年1月~5月)はメーリングリストで集計した354例(同3歳)を対象とした.ピーク月の比較で,第6波は第5波までの5倍の入院数を認めた.第5波までは軽症例(発熱のみ,上気道炎,無症状)が9割を占めたが,重症肺炎が1例見られた.一方,第6波では,痙攣(19.5%),クループ症状(4.5%)での入院例が増加した.痙攣のうち重積が42%,群発が30.4%を占め,3例が脳炎・脳症と診断された.また,この3例を含む13例(3.7%)が集中治療室管理またはそれに準ずる治療を要した.第6波での新型コロナワクチン2回接種完了者は,5~11歳で2.6%,12歳以上で40%と低率であった.このように,第6波の主体であったオミクロン株流行期には,小児COVID-19患者の症状に変化が見られた.また,入院例での新型コロナワクチン接種率は低く,重症化予防の観点から,小児へのワクチン接種の積極的推奨の重要性が示唆された.
著者
大森 啓一 岡田 広吉
出版者
一般社団法人 日本粘土学会
雑誌
粘土科学 (ISSN:04706455)
巻号頁・発行日
vol.18, no.2, pp.40-50, 1978-06-25 (Released:2011-09-20)
参考文献数
9

An old castle named Tagajo was founded between the 8th and 11th Centuries in Miyage Prefecture, Japan. Roofing tiles were unearthed from the ruins of castle and old oven, which were studied by mineralogical methods.Roofing tiles used in the study were classified from archaeology into two groups, one of which was the I era tiles and the other the II, III and IV era tiles. Every tiles were 12 to 34mm in thickness. The I tiles were homogeneous with light dark color and the others inhomogeneous roughly with ashy color. In every tiles many porphyritic quartz crystals were found in association with plagioclase, hornblende, augite and magnetite under a microscope. Their groundmasses consisted of quartz and glassy materials.Textures were found to be fluidal, banded and microfolded in the I tiles, and were more notable than those of the II to IV tiles. From X-ray diffraction patterns the presence of quartz, plagioclase, cristobalite and mullite was detected. From chemical analyses all compositions concentrated on a small area centered at 70% SiO2, 20% Al203 and 10% the others in the triangle phase diagram. Refractorinesses of every tiles were found to be under SK 26. Water absorptions of these tiles satisfies a requirement of the JIS standard for roofing tiles.From these results it was found that the fired temperatures were between 1, 000° and 1, 200°C and the techniques making roofing tiles progressed from the I era to the II to IV eras.
著者
南部 松夫 岡田 広吉
出版者
東北大學選鉱製錬研究所
雑誌
東北大學選鑛製錬研究所彙報 = Bulletin of the Research Institute of Mineral Dressing and Metallurgy, Tohoku University (ISSN:0040876X)
巻号頁・発行日
vol.19, no.1, pp.1-12, 1963-10-28

The bedded manganese oxide deposits of Iwasaki distrct, Aomori Prefecture occur in most cases in tuffaceous sandstone of the upper Miocene age. The mother rock of these deposits is slightly affected by the hydrothermal alteration, and the ore is characterized by the mineral composition of a single manganese mineral, todorokite. The mineral is identified mainly by the X-ray powder method and chemical and differential thermal analyses. The chemical formula is (Mn^<2+>_<0.58> Ca_<0.09> Mg_<0.20> Ba_<0.04>)_<0.90> Mn^<4+>_<3.06> O_<7.00>・2.1 H_2O which agrees well with Mn^<2+>Mn_3^<4+>O_7・2-xH_2O given by L.T.Larsen in 1962.
著者
韓 宝 岡田 広司
出版者
名古屋市立大学
雑誌
オイコノミカ (ISSN:03891364)
巻号頁・発行日
vol.43, no.3, pp.121-137, 2007-03-01