The Experts below are selected from a list of 291 Experts worldwide ranked by ideXlab platform
P K Mitra - One of the best experts on this subject based on the ideXlab platform.
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thermal decomposition of precipitated low Bulk Density basic aluminium sulfate
Materials Chemistry and Physics, 2004Co-Authors: I N Bhattacharya, P K Gochhayat, S. Paul, P S Mukherjee, P K MitraAbstract:Abstract Hydrated basic aluminium sulfates (BAS) are of great importance as precursor material for the preparation of activated and high pure calcined aluminas. Low Bulk Density category BAS powders have superior quality over higher Bulk Density varieties in terms of higher surface area, more active sites for adsorption, etc. A brief description on the processing route of low Bulk Density BAS powders utilizing aluminium sulfate and ammonia as hydrolyzing precipitant has been presented. Low Al 3+ concentration and pH of around 7–7.2 were found to be crucial for formation of such material. Characterization of this low Bulk Density material and its different calcined products was also carried out. The characterization was performed through XRD, FTIR and DTA studies. The XRD analysis indicated precipitated powder to be an amorphous material. Interestingly, this amorphous structure is retained till 800 °C. At 900 °C, η-Al 2 O 3 phase appears to be the only transitional phase during its transformation to α-Al 2 O 3 at 1100–1200 °C. FTIR study showed characteristic vibration modes related to molecular water, co-ordinated sulfate and AlO bonds.
I N Bhattacharya - One of the best experts on this subject based on the ideXlab platform.
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thermal decomposition of precipitated low Bulk Density basic aluminium sulfate
Materials Chemistry and Physics, 2004Co-Authors: I N Bhattacharya, P K Gochhayat, S. Paul, P S Mukherjee, P K MitraAbstract:Abstract Hydrated basic aluminium sulfates (BAS) are of great importance as precursor material for the preparation of activated and high pure calcined aluminas. Low Bulk Density category BAS powders have superior quality over higher Bulk Density varieties in terms of higher surface area, more active sites for adsorption, etc. A brief description on the processing route of low Bulk Density BAS powders utilizing aluminium sulfate and ammonia as hydrolyzing precipitant has been presented. Low Al 3+ concentration and pH of around 7–7.2 were found to be crucial for formation of such material. Characterization of this low Bulk Density material and its different calcined products was also carried out. The characterization was performed through XRD, FTIR and DTA studies. The XRD analysis indicated precipitated powder to be an amorphous material. Interestingly, this amorphous structure is retained till 800 °C. At 900 °C, η-Al 2 O 3 phase appears to be the only transitional phase during its transformation to α-Al 2 O 3 at 1100–1200 °C. FTIR study showed characteristic vibration modes related to molecular water, co-ordinated sulfate and AlO bonds.
Wang Jian - One of the best experts on this subject based on the ideXlab platform.
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THE INFLUENCE OF MINING SUBSIDENCE ON MECHANICAL COMPLSITION,Bulk Density AND SOIL POROSITY
Journal of Inner Mongolia Agricultural University, 2006Co-Authors: Wang JianAbstract:The influence of mining subsidence on some soil physical and chemical properties were studied based on measuring and figuring out the soil mechanical composition,Bulk Density and soil porosity of subsidence area and no-subsidence area in Bulanta mining area that lies in southeast Maowusu Sandland.The result showed: the physical clay content of collapsing dune,especially in the 10cm of surface,significantly decreases;Bulk Density and soil porosity in top and middle of collapsing dune is not significantly different,however,Bulk Density in bottom and depression of collapsing dune significantly decreases,soil porosity in bottom and depression of collapsing dune significantly increases;Bulk Density and soil porosity from 0 to 40cm is not significantly different,but Bulk Density from 40 to 100cm significantly decreases,soil porosity from 40 to 100cm significantly increases;Slit Density has little effect on Bulk Density and soil porosity;The depth of subsidence has little effect on Bulk Density at the border of subsidence area.With the increase in subsidence depth,the margin of soil Bulk Density in the two sides of slit increases random inside the subsidence area.
Shao Ming-an - One of the best experts on this subject based on the ideXlab platform.
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Effect of Changing Bulk Density during SWCC Measurement on SWCC Parameters
Journal of Soil and Water Conservation, 2007Co-Authors: Shao Ming-anAbstract:The measurement of soil water characteristic curve(SWCC) would cause a great change on Bulk Density itself.And the soil water characteristic will change corresponding with the increase of Bulk Density.In order to clarify the effect of this kind of changing Bulk Density on soil water retention,this study measured soil water retention curves under a series of certain Bulk Density for four undisturbed soils with centrifuge,analyzed the effect of changing Bulk Density on Brooks-Corey and van Genuchten model parameters.The results showed that the degree of saturated increased with the increase of Bulk Density.Parameters A and α of four soils decreased with the increase of Bulk Density,and power function can describe it well.Parametersandof Heilu λ and n Lou soil increased with the increase of Bulk Density,and it can be expressed by linearity,which was different from HuangMian and Hong soil.In general speaking,no mater disturbed or not,changing Bulk Density during soil water retention measurement had an identical influence on silt clay loam soil and silt clay soil.Compared with van Genuchten model,Brooks-Corey model had a better relationship between parameters and Bulk Density.This study will be beneficial in modifying the Bulk Density effect on soil water retention measurement.
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Effect of Bulk Density on Soil Saturated Water Movement Parameters
Journal of Soil and Water Conservation, 2006Co-Authors: Lu Dianqing, Shao Ming-an, Liu Chun-pingAbstract:In the paper,saturated mass water content and saturated hydraulic conductivity for different Bulk densities were measured by the method of fixing Bulk Density of olefin.Effects of Bulk Density on the two parameters were analyzed.The results showed that saturated mass water content decreased with the increment of Bulk Density and was inverse to Bulk Density.Saturated hydraulic conductivity tended to diminish in power function when Bulk Density increased.The researches will provide appropriate function quantificationally to build innovative frame on water movement theory for the soil with changing Bulk Density.It is helpful to utilize soil water resource reasonably.
P S Mukherjee - One of the best experts on this subject based on the ideXlab platform.
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thermal decomposition of precipitated low Bulk Density basic aluminium sulfate
Materials Chemistry and Physics, 2004Co-Authors: I N Bhattacharya, P K Gochhayat, S. Paul, P S Mukherjee, P K MitraAbstract:Abstract Hydrated basic aluminium sulfates (BAS) are of great importance as precursor material for the preparation of activated and high pure calcined aluminas. Low Bulk Density category BAS powders have superior quality over higher Bulk Density varieties in terms of higher surface area, more active sites for adsorption, etc. A brief description on the processing route of low Bulk Density BAS powders utilizing aluminium sulfate and ammonia as hydrolyzing precipitant has been presented. Low Al 3+ concentration and pH of around 7–7.2 were found to be crucial for formation of such material. Characterization of this low Bulk Density material and its different calcined products was also carried out. The characterization was performed through XRD, FTIR and DTA studies. The XRD analysis indicated precipitated powder to be an amorphous material. Interestingly, this amorphous structure is retained till 800 °C. At 900 °C, η-Al 2 O 3 phase appears to be the only transitional phase during its transformation to α-Al 2 O 3 at 1100–1200 °C. FTIR study showed characteristic vibration modes related to molecular water, co-ordinated sulfate and AlO bonds.
