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Online since: July 2007
Authors: Roger B. Herbert, Linda Höckert, Mattias von Brömssen, Helen Friis, Gunnar Jacks
The waste rock collected for these experiments is classified as a gravel-rich sand,
with >80% of the material in the grain-size range of 0.2 mm - 20 mm.
The effluent concentrations for a number of constituents, such as sulfate (Fig. 3), Zn, Cu (Fig. 4), Mg, Mn (Fig. 5) and Al (data not shown), are rather high for the first ca. 4 weeks of the experiment, after which concentrations for all these constituents start to decrease.
The variations in various metal and sulfate concentrations in the effluent from the untreated column indicate a number of geochemical processes are controlling the aqueous composition.
The effluent concentrations for a number of constituents, such as sulfate (Fig. 3), Zn, Cu (Fig. 4), Mg, Mn (Fig. 5) and Al (data not shown), are rather high for the first ca. 4 weeks of the experiment, after which concentrations for all these constituents start to decrease.
The variations in various metal and sulfate concentrations in the effluent from the untreated column indicate a number of geochemical processes are controlling the aqueous composition.
Online since: June 2011
Authors: Christophe Sigli, Benjamin Decreus, Frédéric de Geuser, Alexis Deschamps, Patricia Donnadieu
In the present case, the very low value of the plate thickness requires to correct for the effect of Ewald sphere curvature and the effect of grain misorientations within the sample volume illuminated by the X-ray beam.
Thus it does not seem that the composition of the solid solution can account for the large difference in incubation time or for the large difference in precipitate number density between the two alloys.
The precipitation of the T1 phase as platelet precipitates has been shown to be influenced by the alloy solute content, which controls particularly the incubation time before its nucleation, and the resulting precipitate number density.
Thus it does not seem that the composition of the solid solution can account for the large difference in incubation time or for the large difference in precipitate number density between the two alloys.
The precipitation of the T1 phase as platelet precipitates has been shown to be influenced by the alloy solute content, which controls particularly the incubation time before its nucleation, and the resulting precipitate number density.
Online since: January 2012
Authors: T. Srinivasa Rao, S. Kumaran, M. Thirumurugan, Rengasamy Selvaraj
This is due to the fact that the higher surface area, the high concentration of crystal defects, such as dislocations, stacking faults, and vacancies, and the greater number of grain boundaries provide more nucleation sites available for hydride.
For a chemical reaction to proceed at a reasonable rate, there should exist an appreciable number of molecules with energy equal to or greater than the activation energy.
For a chemical reaction to proceed at a reasonable rate, there should exist an appreciable number of molecules with energy equal to or greater than the activation energy.
Online since: December 2010
Authors: Ling Wang, Yan Feng Li, Xi Yuan Liu, Zhao Xia Chen
Table 1 Parameters of heavy compaction test apparatus
Hammer weight
[kg]
Diameter of hammer
[cm]
Drop height
[cm]
Dimension of
compaction mould
Number of hammerblow
layer
Number of hammerblow in every layer
Admissible maximal grain size
[mm]
Inner diameter
[cm]
Height
[cm]
Cubage
[cm3]
4.5
5.0
45
15.2
12.0
2177
3
94
40
In the molding of tamped concrete specimens, the maximal dense condition is the control standard.
Online since: June 2014
Authors: Wei Fu Liu, Shuang Long Liu, Li Xin Sun
Contraction joint occurrence in two ways: one is nearly vertical distribution, seam side than the flat, mostly plates, sutural nearly parallel cores, vertical extension distance is longer, but often terminate in rock, slit to tensional joints; Second, nearly horizontally extending its poor continuity slit width is small, multi-cores such joints are filled, multi-stitch formation compared with the first small scale, a small number of such joints at diagenesis period.
Combination Type Filling conditions Primary porosity Blow pores Magmatic gas spill Top of the distribution of rock, round, oval Associated with contraction joints Common chlorite half filled Almond pores After filling pores between mineral Top distributed in rock, irregular Associated with the dissolution pores Filling - half filled Between gravel pores Accumulation and crystallization Distributed in the breccia Ccontraction with the joints connected Filling weak Intergranular pores Mineral crystallization Smaller pores, Polygonal Connected with the construction joints Filling - half filled Primary fracture Contraction joints Condensation contraction Distributed in the rock edge, high-low angle Connected with the solution openings Filling weak, filled with a small amount of mud Contraction joints Rock condensing contraction, fracturing Distributed in the rock Connected to the primary pores Filling - half filled Grain
Epidiagenetic and atmospheric water leaching, erosion is to produce a large number of secondary fractures.
Combination Type Filling conditions Primary porosity Blow pores Magmatic gas spill Top of the distribution of rock, round, oval Associated with contraction joints Common chlorite half filled Almond pores After filling pores between mineral Top distributed in rock, irregular Associated with the dissolution pores Filling - half filled Between gravel pores Accumulation and crystallization Distributed in the breccia Ccontraction with the joints connected Filling weak Intergranular pores Mineral crystallization Smaller pores, Polygonal Connected with the construction joints Filling - half filled Primary fracture Contraction joints Condensation contraction Distributed in the rock edge, high-low angle Connected with the solution openings Filling weak, filled with a small amount of mud Contraction joints Rock condensing contraction, fracturing Distributed in the rock Connected to the primary pores Filling - half filled Grain
Epidiagenetic and atmospheric water leaching, erosion is to produce a large number of secondary fractures.
Online since: July 2015
Authors: Kuwat Triyana, M. Taukhid Subekti, Prasetyo Aji, Abdul Rohman, Shidiq Nur Hidayat
In the presence of a deoxidizing gas, the surface density of the negatively charged oxygen decreases, so the barrier height in the grain boundary is reduced.
The first and the second groups, indicated by number 1 and 2, correspond to sunflower and grape sheet oils, while the third, fourth and fifth indicated by number 3-5 correspond to mutton, lard and chicken fats, respectively.
The first and the second groups, indicated by number 1 and 2, correspond to sunflower and grape sheet oils, while the third, fourth and fifth indicated by number 3-5 correspond to mutton, lard and chicken fats, respectively.
Online since: October 2007
Authors: Hong Ming Lin, Chung Kwei Lin, Chen Chin Yi, Chien Yie Tsay, Wei Hsiang Chan, Cherng Yuh Su
Accordingly, a number of methods, such as gas condensation technique [1,2], have been developed
for the preparation of metal/oxide nanoparticles.
The average grain size of as-prepared nanocrystalline powders was 20 ± 5 nm.
Magnitudes of the RDF indicate the coordination numbers of detected atom at various distances.
The average grain size of as-prepared nanocrystalline powders was 20 ± 5 nm.
Magnitudes of the RDF indicate the coordination numbers of detected atom at various distances.
Online since: June 2004
Authors: Heiner Ryssel, Lothar Frey, Roland Weiss, Anton J. Bauer, Martin Rambach
Journal Title and Volume Number (to be inserted by the publisher) 3
well known step bunching phenomena [3].
No step bunching can be seen, instead irregular distributed grains occur.
The time of 20s is too short to activate a sufficient number of dopants.
No step bunching can be seen, instead irregular distributed grains occur.
The time of 20s is too short to activate a sufficient number of dopants.
Online since: November 2011
Authors: Li Feng, Yu Ce Wang
Problem Put Forward
Though a large number of Polycarboxylate superplasticizer engineering practice in production and engineering problems and solutions at home and abroad have proved that promote the use of polycarboxylate superplasticizer is the necessary requirement for high-performance concrete quality.
Fineness modulus is 2.8, clay content is 0.4%; using gravel as coarse aggregate and it is 5 ~ 25mm continuous grain-size distribution, of which more than 70% of 16mm of gravel, with clay content of 0.3%..
After a large number of experiments to confirm this use of silicone defoamer and testing to determine if silicone defoamer dosage is 0.05%, PC3018 air content is 1.8%.
Fineness modulus is 2.8, clay content is 0.4%; using gravel as coarse aggregate and it is 5 ~ 25mm continuous grain-size distribution, of which more than 70% of 16mm of gravel, with clay content of 0.3%..
After a large number of experiments to confirm this use of silicone defoamer and testing to determine if silicone defoamer dosage is 0.05%, PC3018 air content is 1.8%.
Online since: June 2011
Authors: Liang Wen Wu, Sheng Lu, Jing Chen
In the case of magnetron sputtered films applied to magnesium alloys and the assessment of their behavior, the number of studies is relatively scarce [7-11].
It is observed from Fig.1 that the number of crystal clusters in TiAlN ternary compound film increase when the partial pressure ratio of N2/Ar changed from 0.5:10 to 1.5:10, while the size of the crystals clusters tends to decrease.
It may derive from the effect of grain refining as N2/Ar partial pressure ratio increased from 0.5:10 to 1.5:10 as shown in fig. 1 and the appearance of TiN while N2/Ar ratio reached 2:10.
It is observed from Fig.1 that the number of crystal clusters in TiAlN ternary compound film increase when the partial pressure ratio of N2/Ar changed from 0.5:10 to 1.5:10, while the size of the crystals clusters tends to decrease.
It may derive from the effect of grain refining as N2/Ar partial pressure ratio increased from 0.5:10 to 1.5:10 as shown in fig. 1 and the appearance of TiN while N2/Ar ratio reached 2:10.