著者
向阪 保雄 野村 俊之 内藤 牧男
出版者
一般社団法人 粉体工学会
雑誌
粉体工学会誌 (ISSN:03866157)
巻号頁・発行日
vol.57, no.10, pp.526-529, 2020-10-10 (Released:2020-12-09)
参考文献数
5

Aerosol infection issues by COVID-19 were discussed from the viewpoint of particle technology, and the following conclusions were obtained: 1) Number of virus contained in a 10 μm droplet is very few, only 1 virus per 2000 droplets, whereas 0.5 virus in a 100 μm droplet, if 106 copies/mL of viral load in saliva is assumed. 2) Droplets larger than 100 μm can quickly settle down by gravity. 3) The possibility of aerosol infection is very low unless in unusual environments. 4) Mask is very effective, but the leakage from the space between mask and face has risk in heavy exhalation.
著者
三輪 茂雄
出版者
一般社団法人 粉体工学会
雑誌
粉体工学研究会誌 (ISSN:18838766)
巻号頁・発行日
vol.11, no.10, pp.581-591, 1974-12-01 (Released:2010-08-10)
参考文献数
27
著者
神田 良照 山下 隆司 佐々木 寿人 新井山 忍
出版者
一般社団法人 粉体工学会
雑誌
粉体工学会誌 (ISSN:03866157)
巻号頁・発行日
vol.24, no.10, pp.635-639, 1987
被引用文献数
1

In order to study the relationship between grindability and particle shape, eight kinds of particle sizes and the seven kinds of shape indices of feed particles and unfractured particles were measured after impact crushing. The samples used were quartz and limestone. The size of particles ranged from 4 to 6 meshes.<br>As a result, the shape indices defined by (N/T), (L/T) and (F/T) are useful to characterize the grindability of particles.
著者
二階堂 満 吉田 祐希 古関 健一 福村 卓也 渡邊 崇 戸谷 一英
出版者
一般社団法人 粉体工学会
雑誌
粉体工学会誌 (ISSN:03866157)
巻号頁・発行日
vol.55, no.9, pp.483-491, 2018-09-10 (Released:2018-10-25)
参考文献数
14

This study is aimed to develop a beneficial use of disposed seashells. Sanriku region in Iwate prefecture has an issue of disposals of seashells. In this study, we mechanochemically ground seashells under dry or wet conditions. We used a planetary ball mill, a tumbling ball mill, and a converge mill as mechanochemical grinding machine. After the grinding, we examined the heavy metal absorbencies of the ground materials, and of the compounds with seashell-origin hydroxyapatite (HAP). As a result, followings were found out: 1) When seashell-origin hydroxyapatite was used, it showed adequate heavy metal absorbency (Cd, Pb). 2) When mechanochemically ground scallop seashells without HAP were used, it showed adequate heavy metal absorbency (Cd, Pb). 3) When the scallop seashells are ground for long time under dry condition (mechanochemical grinding), the material tends to be amorphous, and its heavy metal absorbency becomes greater.
著者
鈴木 道也
出版者
一般社団法人 粉体工学会
雑誌
粉体工学会誌 (ISSN:03866157)
巻号頁・発行日
vol.21, no.2, pp.103-109, 1984-02-10 (Released:2010-04-30)
参考文献数
17
著者
林 大和
出版者
一般社団法人 粉体工学会
雑誌
粉体工学会誌 (ISSN:03866157)
巻号頁・発行日
vol.56, no.7, pp.409-416, 2019-07-10 (Released:2019-08-06)
参考文献数
15

Many innovative processing of metal nanoparticle related material were developed by ultrasound and microwave reactor in solid-liquid system. Ultrasound and microwave reactor not only enhanced chemical reaction but also created novel chemical reaction. Metal oxide was used as eco-metal source in our processing. Solid-liquid (metal oxide–ethanol) system will be high concentration and high throughput processing. Realization of innovative nanomaterial fabrication enabled joining environment, low cost and high throughput by combining these reactor and metal oxide, solid-liquid system. This commentary explained reactor and nanomaterial processing problems and introduced the example of some metal nanoparticles related material processing by synergistic effects of solid-liquid system and ultrasound, microwave reactor.

1 0 0 0 OA 血球

著者
舟木 広
出版者
一般社団法人 粉体工学会
雑誌
粉体工学研究会誌 (ISSN:18838766)
巻号頁・発行日
vol.11, no.4, pp.231-245, 1974-06-01 (Released:2010-08-10)
参考文献数
30
著者
徳本 勇人 野村 俊之 星 英之 新居 靖崇 大谷 俊晴 野本 健太
出版者
一般社団法人 粉体工学会
雑誌
粉体工学会誌 (ISSN:03866157)
巻号頁・発行日
vol.54, no.3, pp.172-177, 2017-03-10 (Released:2017-04-22)
参考文献数
17

Particles of additives that are ingested along with food can either adhere to the intestinal microflora or be absorbed, and these may possibly lead to illnesses caused by changes in the microflora composition. Barely 1% of Fe2O3 particles dissolve in acids present in the stomach. In addition, the direct administration of Fe2O3 particles into the stomach with a probe showed no adverse health effects. However, mixing Fe2O3 particles of a smaller diameter into food and orally administering the dose over a period of more than 2 weeks encouraged the multiplication of the diarrhea-causing Clostridium family amongst intestinal flora, indicating the cause of the diarrhea outbreak. On the other hand, multiplication of the Clostridium species was suppressed by the multiplication of another family within the intestinal flora, namely Lactobacillus. It was confirmed that by analyzing the formation of fermentation products such as hydrogen, acetic acid, and lactic acid, symptoms of diarrhea caused by the alteration of intestinal microflora composition spontaneously recovered.
著者
臼井 進之助
出版者
一般社団法人 粉体工学会
雑誌
粉体工学会誌 (ISSN:03866157)
巻号頁・発行日
vol.24, no.12, pp.798-804, 1987-12-10 (Released:2010-04-30)
参考文献数
14
著者
小金沢 勝 浜田 憲二 田中 貴将 仙名 保
出版者
一般社団法人 粉体工学会
雑誌
粉工誌 (ISSN:03866157)
巻号頁・発行日
vol.25, no.8, pp.500-506, 1988
被引用文献数
1 1

Surface modification, size reduction and the improvement of energy efficiency were achieved simultaneously by using organic additives during continuous grinding with a commercial disintegrator (Cosmomizer, Nara Machinery). Triethanol amine(TEA) and toluene solution of stearic acid (SA) in varying concentrations were used as additives. While the organophilization of limestone with SA was detected, the addition of TEA caused the opposite effect. The adhesion of TEA to the limestone was tighter when it was used as a grinding aid than when it was simply added through impregnation. This was suspeted to be the result of a tribochemical reaction.
著者
田中 秀和 中林 祐治 新居 正浩 石川 達雄 中山 武典
出版者
一般社団法人 粉体工学会
雑誌
粉体工学会誌 (ISSN:03866157)
巻号頁・発行日
vol.55, no.5, pp.269-274, 2018-05-10 (Released:2018-07-10)
参考文献数
29

In order to simulate the atmospheric corrosion of tannic acid-coated steels in industrial and coastal districts, artificial steel rust particles of α- and β-FeOOH were synthesized by aerial oxidation of aqueous Fe2+ solutions containing various amounts of tannic acid. Increasing addition amount of tannic acid accelerates the formation of amorphous iron-gallic acid complexes to suppress the generation of FeOOH rust. The crystallization and growth of α-FeOOH particles were inhibited by adding tannic acid, while those of β-FeOOH particles are markedly dependent of addition amount of tannic acid. Accordingly, it can be regarded that the tannic acid eluted from tannic acid-coated steels by atmospheric corrosion strongly affects on the formation of α- and β-FeOOH rust and the effect in coastal area is greater than urban district.

1 0 0 0 OA 西ドイツ便り

著者
小浜 弘幸
出版者
一般社団法人 粉体工学会
雑誌
粉体工学会誌 (ISSN:03866157)
巻号頁・発行日
vol.15, no.1, pp.44-50, 1978-01-01 (Released:2010-04-30)
著者
松田 芳久 辰見 英津子
出版者
一般社団法人 粉体工学会
雑誌
粉体工学会誌 (ISSN:03866157)
巻号頁・発行日
vol.21, no.11, pp.704-714, 1984-11-10 (Released:2010-04-30)
参考文献数
67
被引用文献数
1 1