WordNet

sort according to size
the actual state of affairs; "thats the size of the situation"; "she hates me, thats about the size of it" (同)size of it
any glutinous material used to fill pores in surfaces or to stiffen fabrics; "size gives body to a fabric" (同)sizing
make to a size; bring to a suitable size
a large magnitude; "he blanched when he saw the size of the bill"; "the only city of any size in that area"
the physical magnitude of something (how big it is); "a wolf is about the size of a large dog"
the property resulting from being one of a series of graduated measurements (as of clothing); "he wears a size 13 shoe"
(used in combination) sized; "the economy-size package"; "average-size house"
cover or stiffen or glaze a porous material with size or sizing (a glutinous substance)
a body having finite mass and internal structure but negligible dimensions (同)subatomic_particle
a function word that can be used in English to form phrasal verbs
having the surface treated or coated with sizing
having a specified size

PrepTutorEJDIC

〈U〉〈C〉(人や物の)『大きさ』 / 〈U〉大きいこと / 〈U〉数量,規模 / 〈C〉(帽子・靴・シャツなどの)『サイズ』,『寸法』,型 / 〈U〉《話》実情,真相 / …‘を'大きさ(寸法)によって分類する / …‘を'ある寸法に作る
サイズ,どうさ(紙や織物の細孔(こう)をふさぐ材料) / …‘に'サイズを塗る
小片,(ごく)少量,微量 / 粒子 / 不変化詞(冠詞・前置詞・接続詞・感嘆詞など語形変化のない語);小詞,小辞
サイズ(どうさ)を塗ること,のり付け;サイズ剤,のり剤,どうさ
=ti

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2014/01/04 00:07:09」(JST)

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This article is about general definitions related to particle size. For other uses, see Particle size (disambiguation).

Particle size is a notion introduced for comparing dimensions of solid particles (flecks), liquid particles (droplets), or gaseous particles (bubbles).

The notion of particle size applies to

Colloidal particles;
Particles in ecology;
Particles present in granular material whether airborne or not;
Particles that form a granular material.

The particle size of a spherical object can be unambiguously and quantitatively defined by its diameter.

However, a typical material object is likely to be irregular in shape and non-spherical. The above quantitative definition of particle size cannot be applied to non-spherical particles. There are several ways of extending the above quantitative definition, so that a definition is obtained that also applies to non-spherical particles. Existing definitions are based on replacing a given particle with an imaginary sphere that has one of the properties identical with the particle.

Volume based particle size equals the diameter of the sphere that has same volume as a given particle. Which equals 2*(3*volume(particle)/4/pi)^(1/3).
Weight based particle size equals the diameter of the sphere that has same weight as a given particle. Which equals 2*(3*weight(particle)/4/pi/density(particle)/g)^(1/3).
Area based particle size equals the diameter of the sphere that has the same surface area as a given particle. Which equals 2*(area(particle)/4/pi)^(1/2).
Hydrodynamic or aerodynamic particle size equals the diameter of the sphere that has the same drag coefficient as a given particle.

Another complexity in defining particle size appears for particles with sizes below a micrometre. When particle becomes that small, thickness of interface layer becomes comparable with the particle size. As a result, position of the particle surface becomes uncertain. There is convention for placing this imaginary surface at certain position suggested by Gibbs and presented in many books on Interface and Colloid Science.^[1]^[2]^[3]^[4]^[5]^[6]

Definition of the particle size for an ensemble (collection) of particles presents another problem. Real systems are practically always polydisperse, which means that the particles in an ensemble have different sizes. The notion of particle size distribution reflects this polydispersity. There is often a need of a certain average particle size for the ensemble of particles. There are several different ways of defining such a particle size.

There is an International Standard on presenting various characteristic particle sizes.^[7] This set of various average sizes includes median size, geometric mean size, average size.

There are several methods for measuring particle size. Some of them are based on light, other on ultrasound, or electric field, or gravity, or centrifugation. They are briefly described in the section particle size distribution.

References[edit]

^ Lyklema, J. “Fundamentals of Interface and Colloid Science”, vol.2, page.3.208, 1995
^ Hunter, R.J. "Foundations of Colloid Science", Oxford University Press, 1989
^ Dukhin, S.S. & Derjaguin, B.V. "Electrokinetic Phenomena", J.Willey and Sons, 1974
^ Russel, W.B., Saville, D.A. and Schowalter, W.R. “Colloidal Dispersions”, Cambridge University Press,1989
^ Kruyt, H.R. “Colloid Science”, Elsevier: Volume 1, Irreversible systems, (1952)
^ Dukhin, A.S. and Goetz, P.J. "Ultrasound for characterizing colloids", Elsevier, 2002
^ ISO Standard 9276-5 "Representation of results of particle size analysis" (2004)

UpToDate Contents

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English Journal

Ultrasound-assisted extraction of three bufadienolides from Chinese medicine ChanSu.

Sun Y, Bi J, Zhang L, Ye B.SourceState Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, College of Agronomy, Shandong Agricultural University, 271018 Taian, China.
Ultrasonics sonochemistry.Ultrason Sonochem.2012 Nov;19(6):1150-4. Epub 2012 Mar 30.
In this study, the application of ultrasound-assisted extraction (UAE) method was shown to be more efficient in extracting anti-tumor bufadienolides (bufalin, cinobufagin and resibufogenin) from important animal medicine of ChanSu than the maceration extraction (ME) and soxhlet extraction (SE) metho
PMID 22521212

Ultrasound-assisted coating of polyester fiber with silver bromide nanoparticles.

Moosavi R, Abbasi AR, Yousefi M, Ramazani A, Morsali A.SourceDepartment of Chemistry, Shahr e Rey Branch, Islamic Azad University, Tehran, Islamic Republic of Iran.
Ultrasonics sonochemistry.Ultrason Sonochem.2012 Nov;19(6):1221-6. Epub 2012 Jan 28.
The growth of silver bromide nanoparticles on polyester fiber was achieved by sequential dipping steps in alternating bath of potassium bromide and silver nitrate under ultrasound irradiation. The effects of ultrasound irradiation, concentration and sequential dipping steps in growth of the AgBr nan
PMID 22494594

Japanese Journal

Influence of Microstructure on Fatigue Fracture Characteristics of Al2O3

Kido Mitsuo,Katayama Gonojo,Inoda Nana,Tsuchibushi Yasuyuki
広島工業大学研究紀要 33, 67-74, 36192-00-00
… Fatigue fracture characteristics under static and cyclic loading were investigated for three kinds of Al2O3, with microstructures controlled by sintering additives (MgO, SiO2+CaO) and particle size. …
NAID 120005403235

PS単分子鎖の溶液中のサイズと溶媒除去後のサイズの関係

髙取永一,松本良憲,安達孝幸 [他]
日本ゴム協会誌 = Journal of the Society of Rubber Science and Technology, Japan 87(6), 246-251, 2014-06
NAID 40020086819

Development of a new rice beverage by improving the physical stability of rice slurry

Kitamura Yutaka,Koyama Masaru
Journal of food engineering 131, 89-95, 2014-06
… A separated milling method was established, which reduced the particle size to less than 20 μm. …
NAID 120005440065