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

被引用文献数

2

---

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

荒川 正文

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.9, no.2, pp.105-109, 1972-04-01 (Released:2010-08-10)

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

佐野 〓

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.1, no.2, pp.127-136, 1964-11-01 (Released:2010-08-10)

参考文献数

8

著者

高井(山下) 千加 馬渕 裕也 池田 純子 藤 正督 仙名 保 大矢 豊

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.58, no.4, pp.164-169, 2021-04-10 (Released:2021-05-21)

参考文献数

16

被引用文献数

1 1

---

Mechanochemistry offers sustainable synthesis of the functionalized cellulose nanofiber (CNF). In this study, changes in the microstructure of the CNF aqueous sol by planetary ball milling were investigated in terms of its rheological behavior, crystallinity, and diameter distribution. The surface activity of the CNF was additionally characterized by a pulsed nuclear magnetic resonance (NMR). A decreased thixotropy hysteresis loop observed in the 100 min−1-treated CNFs indicated a weaker interaction among the fibers, but still having a three-dimensional structure. 300 min−1 could collapse them. A decreased x-ray diffraction peak intensity observed in the 500-min−1-treated CNF could indicate a split in the fiber’s bundle as well as shredding. An increase in the wet surface area (SNMR) could indicate surface activity in the 500-min−1 milled CNF sol. Such newly formed hydroxyl groups can serve as effective reaction sites with, for example, the TiO2 precursor and perhaps favorably works to improve the photocatalytic performance.

著者

永徳 久登

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.36, no.7, pp.568-570, 1999

著者

神田 良照 山下 隆司 佐々木 寿人

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.22, no.3, pp.159-160, 1985

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

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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

峯尾 隼人 正岡 功士

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.9, pp.596-603, 2017-09-10 (Released:2017-10-31)

参考文献数

5

被引用文献数

1 1

---

We examined about the chemical change of Japanese sea salt using Thermo Gravimetric and Mass Spectrometric analyzer (TG-MS). TG-MS spectrums of the salt, calcium chloride tetra-hydrate and magnesium chloride hexa-hydrate were measured. From the result, it’s thought that a formation of hydrogen chloride by heating the salt is caused by the chemical decomposition of magnesium chloride hydrate in general. On a temperature rising process, practical reaction temperature is increased with sample mass and heating rate. And the formation rate of the hydroxyl magnesium chloride and magnesium oxide is increased by moisture in a gas phase. The moisture in a gas phase cause oxidize anhydrous magnesium chloride to magnesium oxide around 500°C as shown in following reaction. MgCl2+H2O→MgO+2HCl. From these result, we concluded that control of residence time, gas-solid volume ratio and moisture in gas phase is important for reduce of hydrogen chloride formation in drying process and calcining process.

著者

山井 三亀夫 中田 洋一

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.2, pp.95-103, 2018-02-10 (Released:2018-03-20)

参考文献数

9

被引用文献数

2 1

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It is well known that Discrete Element Method, DEM, has been applied to predict dynamics of granular systems by tracing all the particles by solving equations of motions. When it is applied to industrial applications, we immediately are faced to the problems of computing cost, due to too many particles. That is why coarse-grained (CG) simulation methods are required, where a group of particles is replaced as a coarse-grained particle to decrease the number of particle. So far, several CG simulation methods such as SPA model and coarse-grained model have been discussed. So far, CG simulation method has problems of reproducing scaling properties of the granular systems at high scaling ratios, in which contact effects are dominant. The aim of this research is to solve the problems. This paper proposes a new simulation method called scalable DEM (SDEM), which is based on the followings assumptions: 1) particles on the force network only contributes to the dynamics of granules, 2) there are statistically same picture in terms of structure for different scaling ratios. In the paper, SDEM was applied to two systems: “dam break” and “discharge of granules from a rectangular container.” The following results were obtained through the research: a) comparable results were obtained for different scaling ratios, b) simulation predictions match to the experimental data for both two cases.

著者

村田 博之

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.19, no.5, pp.291-295, 1982-05-10 (Released:2010-04-30)

著者

鈴木 耕太 菅野 了次

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.59, no.5, pp.220-225, 2022-05-10 (Released:2022-06-08)

参考文献数

26

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In materials chemistry, technology related to data science methods is attracting attention because of their high potential. In this review, we introduce the examples of material search for lithium-ion conductors from classical methods to the use of materials informatics, including our practical examples. Appling informatics technology such as the recommender system, the novel approaches in the composition-based material search were examined. Although some novel materials were discovered, high ionic conducting properties (e.g., σ > 10−4 S cm−1) were not confirmed. As a result, in the case of lithium-ion conducting crystalline materials, dramatic improvements in material search efficiency have not been achieved even if the most advanced methods have been applied so far. Therefore, it is necessary to establish a novel approach for material search by combining the various techniques from classical to advanced methods, including the experimental, theoretical calculation, and informatics approaches.

著者

松岡 由香里 大崎 修司 仲村 英也 綿野 哲

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.58, no.8, pp.414-423, 2021-08-10 (Released:2021-10-13)

参考文献数

26

被引用文献数

2

---

In this study, a neural network (NN) was applied to a continuous manufacturing process of tablets to predict the tablet physical properties based on a twin-screw granulation operating conditions and tableting pressure. The hyperparameters in the NN model were optimized to accurately predict the tablet physical properties. The constructed NN model successfully demonstrated the predictive capability with the R2 of ca. 0.9 in both training and validation. The effects of the granulation operating conditions and the tableting pressure on the tablet physical properties were investigated. It was found that the tableting pressure was the most dominant factor for the tablet hardness and disintegration time. Among the granulation operating conditions, liquid solid ratio had the strongest impact on the tablet physical properties. Focusing on the tableting pressure and liquid solid ratio, the contour maps for the relationships between the operating conditions and the tablet physical properties were obtained by the NN model. It was suggested that the obtained contour maps can be helpful to predict the continuous manufacturing of tablets with the desired tablet physical properties.

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

被引用文献数

1

---

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

三輪 茂雄

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.35, no.8, pp.595-602, 1998-08-10 (Released:2010-04-30)

参考文献数

14

著者

青野 昌司 青山 三樹男 池川 昭子 池森 亀鶴 上田 康 臼井 一男 川北 公夫 小浜 弘幸 水渡 英二 鶴林 一夫 早川 宗八郎 加藤 悦三

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.18, no.2, pp.79-94, 1981-02-10 (Released:2010-04-30)

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

被引用文献数

1

---

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.

著者

福居 篤子

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.45, no.7, pp.522-523, 2008

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