Characterization of Atmosphere PM2.5 and Dustfall in Xining (China)

2013 ◽  
Vol 562-565 ◽  
pp. 1422-1427 ◽  
Author(s):  
Jun Tang ◽  
Fa Qin Dong ◽  
Qun Wei Dai ◽  
Yue Quan Deng
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Elemental Composition ◽  
Size Distribution ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
Mineral Phase ◽  
Three Samples ◽  
Particle Size Analyzer

In this paper, mineral phase, elemental composition and size distribution were analysed by means of XRD, XRF and laser particle size analyzer respectively. According to the results of XRD, quartz, illite, calcite and albite were all found in three samples; Dolomite was found only in dustfall; Clinochlore was existed in both PM2.5 and soil. From the results of XRF, elemental compositon of three samples were focused on elemental Na, Si, Al, S, Ca, Fe, Mg, K. Based on the grain size analysis, the size distribution of dustfall mainly ranges from 1µm to 40µm.

scholarly journals Investigation of Particle Size Distribution for Fine-Grained Soil Using a Grain Size Analysis Equipment Automated by X-ray Method

2000 ◽  
Vol 40 (2) ◽  
pp. 127-133
Author(s):  
Yukio Furukawa ◽  
Tatsushi Fujita ◽  
Tadayuki Kunihiro ◽  
Hisashi Tsuchiya ◽  
Yukio Saito
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
Ray Method ◽  
X Ray ◽  
Fine Grained ◽  
Fine Grained Soil

Synthesis and Electrochemical Properties of Li4Ti5O12/CuO Anode Material for Li-Ion Batteries

2011 ◽  
Vol 279 ◽  
pp. 77-82 ◽  
Author(s):  
Ji Ping Zhu ◽  
Guang Yang ◽  
Jun Jie Zhao ◽  
Qing Song Wang ◽  
Hong Wei Yang
Keyword(s):  
Electrochemical Properties ◽  
Specific Capacity ◽  
Solid State Reaction Method ◽  
Raw Material ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
Spinel Type ◽  
Three Samples ◽  
Particle Size Analyzer ◽  
Li Ion

Spinel-type electrode material Li4Ti5O12/CuO was synthesized by a two-step solid state reaction method. Cupric acetate (Cu(Ac)2) was used as raw material mixed into Li4Ti5O12 to coat the surface of Li4Ti5O12 with CuO in order to improve the electrochemical and cycle performances. The samples were characterized by XRD and the grain size analysis was researched by laser particle-size analyzer. The curves of charge/discharge and cycles Li4Ti5O12/CuO were researched. The results showed that the electrochemical properties of the material were improved. Among the three samples investigated, it was found that the Li4Ti5O12/CuO (coating amount was 4wt%) possesses the best electrochemical performance, and the first discharge specific capacity was 224, 173, 165 and 162mAh/g at 0.5C, 1C, 5C and 10C rate, respectively.

scholarly journals Dust Particle Size and Statistical Parameters

2021 ◽  
pp. 57-93
Author(s):  
Noor Al-Dousari ◽  
Modi Ahmed ◽  
Ali Al-Dousari ◽  
Musaad Al-Daihani ◽  
Murahib Al-Elaj
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Size Distribution ◽  
Fine Sand ◽  
Coarse Sand ◽  
Optical Methods ◽  
Size Analysis ◽  
Coarse Silt ◽  
Statistical Parameters ◽  
Fine Silt

AbstractGrain ‘size’ can be specified and measured in several different ways. All methods of grain size determination have blemishes, and the choice of the most appropriate method is governed by the nature of the sample and the use to which the data are placed. Four main methods are currently used for size analysis of sands: (a) sieving; (b) settling tube analysis; (c) electro-optical methods, including Coulter Counter analysis and laser granulometry; and (d) computerized image analysis. The classification of the particle size distribution of Kuwait dust was mapped according to the parameters proposed by Folk And Ward (1957) which were widely used for quantitative comparisons between natural grain size distribution and the lognormal distribution that shows better sorted sediments have lower values of σ1. Maps of the distribution of dust in Kuwait were obtained that included: fine sand (F.S.), Coarse sand (C.S), Medium Sand (M.S), Very Fine Sane (V.F.S), Very Coarse Silt (V.C.Silt), Coarse Silt (C.Silt), Medium Silt (M.Silt), Fine Silt (F.Silt), Very Fine Silt (V.F.Silt), in addition to that, the deposition percentage of Clay, Sand, mud (silt plus clay) and silt were provided.

scholarly journals Influence of α-Bi2O3 chemical prehistory on the morphology of the obtaining basic bismuth succinate

2021 ◽  
Vol 340 ◽  
pp. 01020
Author(s):  
Liubov Afonina ◽  
Evgeniya Timakova
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Grain Size ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
Medical Applications ◽  
Antibacterial Drug ◽  
Chemical Analyses ◽  
Monoclinic Modification ◽  
X Ray

The antibacterial drug, basic bismuth succinate of the composition Ñ2Í4(ÑÎÎBiO)2 is shown to obtain expediently by the interaction of bismuth oxide α-Bi2O3 with a succinic acid solution. Using the method of electron microscopy the influence of the chemical prehistory of obtaining the precursor, monoclinic modification of α-Bi2O3, on the morphological features of basic bismuth succinate synthesized from it has been investigated. The composition of Ñ2Í4(ÑÎÎBiO)2 was confirmed by the data of X-ray phase and chemical analyses. Based on the data of grain size analysis, the particle size of the obtained samples of basic bismuth succinate was estimated and the conditions for the synthesis of fine-crystalline C2H4(COOBiO)2, which is necessary for medical applications, were selected.

scholarly journals Reconsideration at Field Scale of the Relationship between Hydraulic Conductivity and Porosity: The Case of a Sandy Aquifer in South Italy

2014 ◽  
Vol 2014 ◽  
pp. 1-15 ◽  
Author(s):  
Carmine Fallico
Keyword(s):  
Grain Size ◽  
Hydraulic Conductivity ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Effective Porosity ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
Strict Sense ◽  
Field Scale

To describe flow or transport phenomena in porous media, relations between aquifer hydraulic conductivity and effective porosity can prove useful, avoiding the need to perform expensive and time consuming measurements. The practical applications generally require the determination of this parameter at field scale, while most of the empirical and semiempirical formulas, based on grain size analysis and allowing determination of the hydraulic conductivity from the porosity, are related to the laboratory scale and thus are not representative of the aquifer volumes to which one refers. Therefore, following the grain size distribution methodology, a new experimental relation between hydraulic conductivity and effective porosity, representative of aquifer volumes at field scale, is given for a confined aquifer. The experimental values used to determine this law were obtained for both parameters using only field measurements methods. The experimental results found, also if in the strict sense valid only for the investigated aquifer, can give useful suggestions for other alluvial aquifers with analogous characteristics of grain-size distribution. Limited to the investigated range, a useful comparison with the best known empirical formulas based on grain size analysis was carried out. The experimental data allowed also investigation of the existence of a scaling behaviour for both parameters considered.

scholarly journals The validity of laser diffraction system to reproduce hydrometer results for grain size analysis in geotechnical applications

PLoS ONE ◽  
2021 ◽  
Vol 16 (1) ◽  
pp. e0245452
Author(s):  
Hamzah M. Beakawi Al-Hashemi ◽  
Omar S. Baghabra Al-Amoudi ◽  
Zain H. Yamani ◽  
Yassir M. Mustafa ◽  
Habib-ur-Rehman Ahmed
Keyword(s):  
Electron Microscopy ◽  
Grain Size ◽  
Image Analysis ◽  
Size Distribution ◽  
Digital Image ◽  
Digital Image Analysis ◽  
Laser Diffraction ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
Distribution Method

The grain size analysis plays a significant role in any geotechnical study. The grain size analysis, by means of sieving, is usually used for coarse material of particle size > 75 μm. For the fine material; the sedimentation methods are frequently adopted (e.g., hydrometers). Other methods also exist such as electron microscopy, digital image analysis and laser diffraction. The fine geomaterials commonly undergo agglomeration which makes the recognition of individual grain size using digital image analysis or electron microscopy challenging. To facilitate and enhance the grain-size analysis, this study was conducted using the Laser Diffraction System (LDS). Seven samples with different nature (composition and texture) and sources were analyzed by hydrometer and LDS. For LDS, various factors were studied such as air pressure, sonication, dilution, refractive index, and distribution method (volume or number). The results were compared qualitatively and quantitatively based on soil classification systems, fractal dimensions, and other parameters. Furthermore, this study provided a novel criterion to determine which LDS distribution method (volume or number) is to be used depending on the Liquid Limit. A combined sieve-LDS system is recommended to obtain the entire grain size distribution. It is concluded that the LDS is a viable technique that can replace the time-consuming hydrometer method to assess the grain-size distribution.

scholarly journals Modern methods of grain size distribution of soils

2013 ◽  
pp. 302-308
Author(s):  
Volodymyr Radzii
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Soil Mass ◽  
Particle Size Analysis ◽  
Soil Science ◽  
Size Analysis ◽  
Ecological Functions ◽  
Modern Methods

Grain size distribution of soil determines much of water and physical properties of the soil mass. However, it defines ecological functions and morphological memory of soils in the study of their genesis, evolution and use. This article describes the main methods of particle size analysis and suggests the modern methods used increasingly in the research in soil science, geology, chemical, pharmaceutical and other industries. Key words: particle size distribution of soil, sedimentograph, laser diffraction.

Cryomilling and Characterization of Ti/Al2O3 Powders

2018 ◽  
Vol 281 ◽  
pp. 285-290
Author(s):  
Jun Yan Wu ◽  
Qian Liu ◽  
Zhi Hao Wang ◽  
Zhi Wang
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Grain Size ◽  
Liquid Nitrogen ◽  
Room Temperature ◽  
Particle Size Analyzer ◽  
Distribution Phase ◽  
Xrd And Tem ◽  
Milled Powders

In order to prevent the oxidation of Ti, which ultimately leads to the generation of intermetallic compound Ti3Al, a new method of cryomill in liquid nitrogen was used to deal with the Ti/Al2O3 powders. The size distribution, phase composite and microstructure of the powders were analyzed using laser particle size analyzer, XRD, and TEM, respectively. Then, the performances of Ti/Al2O3 cermet sintered using cryomilled powders and room temperature milled powders were compared. The results show that, with the increase of cryomilling time, the grain size decreases shapely and high reactivitive nanoscale powders are finally obtained. With the cryomilling in liquid nitrogen, the Ti-N bonds are formed, which successfully prevent the oxidation of Ti. Ti/Al2O3 cermet sintered using cryomilled powders shows higher density, better mechanical properties than that using RT milled powders.

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