Particle size studies. II. The grain size distribution of bismuth subsalicylate U. S. P.**Presented before the St. John’s University, Student Branch, AMERICANP HARMACEUTIAL ASSOCIATION, May 16, 1941.

1941 ◽  
Vol 30 (8) ◽  
pp. 220-221
Author(s):  
John J. Corcoran ◽  
Sister Mary Etheldreda
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
University Student ◽  
Bismuth Subsalicylate

Effects of Si/Al Molar Ratio on Morphology of Mullite Nanocomposite Synthesized from Kaolin

2011 ◽  
Vol 682 ◽  
pp. 55-59
Author(s):  
Nan Chun Chen ◽  
Wei Wang ◽  
Ai Ping Deng ◽  
Han Mei Ao ◽  
Quan Hong Li
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Aspect Ratio ◽  
Size Distribution ◽  
Calcination Temperature ◽  
Grain Size Distribution ◽  
Distribution Patterns ◽  
Molar Ratio ◽  
Molar Ratios ◽  
Low Aspect Ratio

Mullite nanocomposite was synthesized using kaolin with different Si/Al molar ratios in the range of 1.1- 4.31. The synthesized samples were analyzed and characterized using XRD and SEM techniques and effects of Si/Al molar ratio on mullite nanocrystal morphology have been investigated. SEM results showed that the mullite nanocomposite synthesized from kaolin with different Si/Al molar ratios had different morphologies and distribution patterns of particle size. It was found that the mullite nanocrystals with relatively homogenous grain-size distribution, low aspect ratio, and little agglomeration were produced from the precursors made from kaolin with a Si/Al ratio of 1.1-2.33 at calcination temperature of 1100-1250 oC.

Further Studies on Radiocolloids

1963 ◽  
Vol 1 (4) ◽  
Author(s):  
H. Reinhardt ◽  
J. O. Liljenzin ◽  
R. Lindner
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Continuous Measurement ◽  
Aqueous Suspension ◽  
Alumina Powder ◽  
Average Radius ◽  
Glass Capillary ◽  
Thin Walled

SummaryThe continuous measurement of the diffusion of radiocolloids is made possible by use of a photomultiplier tube viewing a ZnS-covered and thin walled glass capillary inside which the α-radiating particles diffuse in aqueous suspension and get adsorbed at the surface.The method was shown to yield satisfactory results for the particle size of alumina powder of known grain size distribution tagged with (Pb+Bi)-212 or Po-210.Po-210 radiocolloids were found to have an average radius of about 10

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.

Relation Between the Mechanical Specific Energy, Cuttings Morphology, and PDC Cutter Geometry

2014 ◽  
Author(s):  
Babak Akbari ◽  
Stefan Miska ◽  
Mengjiao Yu ◽  
Evren Ozbayoglu
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Rock Fracture ◽  
Confining Pressure ◽  
Mechanical Specific Energy ◽  
Minimum Particle Size ◽  
Testing Facility ◽  
The Difference

This paper discusses a series of experiments performed on Carthage Marble Limestone rock samples in a high pressure single PDC cutter testing facility. The tests were performed at 450 psi confining pressure conditions and four different cutters were used. Two different cutter diameter sizes of 13 mm and 16 mm, each with two different chamfer sizes of 0.010 inch and 0.016 inch were tested. Effect of the cutter geometry on the MSE of the cutting action and grain size distribution are discussed in this paper. The experimental results show that, in the tested range, the difference between the MSE when the two different cutter sizes are considered is insignificant. On the other hand, the results show that a change in the chamfer length from 0.010 inch to 0.016 inch can significantly increase the required MSE (as much as 20%). The cuttings produced at each test were gathered and tested in a particle size testing facility and the results were analyzed to determine which drilling parameters can be best correlated to the particle size distribution of the cuttings. The results show that the minimum particle size of the cuttings has a relatively strong dependency on the MSE of each test. The minimum particle size decreases as the MSE of the cutting increases and this is closely related to the extra energy required to regrind and crush the rock as a consequence of decreased drilling efficiency. In fact, the MSE can be estimated by the rock fracture surface energy and the grain size distribution.

scholarly journals Variability of suspended sediment grain size distribution in winter floods

2016 ◽  
Vol 48 (2) ◽  
pp. 141-151
Author(s):  
Agnieszka Hejduk ◽  
Leszek Hejduk
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Standard Deviation ◽  
Size Distribution ◽  
Suspended Sediment ◽  
Grain Size Distribution ◽  
Sediment Grain Size ◽  
Mean Values ◽  
Average Value ◽  
Sediment Size

Abstract Variability of suspended sediment grain size distribution in winter floods. The work presents the results of research concern variability of suspended sediment grain size, transported during the winter floods in agricultural catchment, in the period of hydrological years 2012-2015. The information about grain size distribution from nine winter flood events were collected over the study period, which allowed to analyze the variability of suspended sediment particle size during the various events. Grain size of sediment was determined using a laser particle size analyzer Mastersizer Microplus from Malvern Instruments Ltd. Variability of individual particle size classes were observed in each flood. Sand fraction dominated in seven of nine measured events. There was no significant increase of suspended sediment size in relation to the maximum of discharge. It can be explain by a relatively low discharge of recorded events. The percentage of material classified as clay (<4 μm) ranged from 0.08 to 1.01%, silt-sized material (>4 and <63 μm) ranged between 9.31 and 67.17% and sand-size material (>63 μm) ranged from 32.01 to 90.61%. The relationship between the particle size and the discharge requires further studies. The diameter d10, d50 and d90 and a standard deviation were calculated for each flood. Mean values of d50 for individual flood ranged between 41.05 and 191.32 μm with average value of 99.01 μm and average standard deviation of 32.57.

scholarly journals Palaeohydrological Characteristics of the Amlekhganj Formation in Central Nepal Sub Himalaya

1999 ◽  
Vol 19 ◽  
Author(s):  
P. D. Ulak ◽  
K. Nakayama
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Laser Diffraction ◽  
Flow Depth ◽  
Central Nepal ◽  
Middle Member

The palaeohydrological studies of the Middle Member of the Amlekhganj Formation, Nepal Sub Himalaya, are based on the grain size and flow depth for values of the palaeoslope gradient, palaeovelocity, and palaeodischarge. The grain size distribution was measured by using the laser diffraction particle size analyser (SALD 3000S; Shimazu), and the flow depth was estimated from the autogenic fining upward succession. The measured values of the palaeoslope gradient, palaeovelocity, and palaeodischarge were 1.21-1.88x10-6 m/m, 0.67-0.78 m/s, and 103-105 m3/s, respectively. The palaeoslope is comparable to the slopes of such modern Himalayan frontal fans as the Kosi Fan.

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