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Online since: April 2014
Authors: Hui Zhang, Hui Min Meng
In addition all of the intensity of peaks are low, and the characteristic peaks are broadened, indicating that the samples are with low crystallinity and small grain.
(2) where F is Faraday’s number, z the differential atomic charge (for Mn2+/Mn4+, z equals 2), MMnO2 the molar weight of EMD, WMnO2 the total weight of deposited EMD, I the deposition current, t the deposition time (t equals 2 hours).
As the solution gradually penetrates into the catalyst layer and then fully contacts with the catalyst, the cathode potential is stabilized after the formation of a sufficient number of the three-phase boundaries.
(2) where F is Faraday’s number, z the differential atomic charge (for Mn2+/Mn4+, z equals 2), MMnO2 the molar weight of EMD, WMnO2 the total weight of deposited EMD, I the deposition current, t the deposition time (t equals 2 hours).
As the solution gradually penetrates into the catalyst layer and then fully contacts with the catalyst, the cathode potential is stabilized after the formation of a sufficient number of the three-phase boundaries.
Online since: August 2023
Authors: Sergei Inozemtsev
The main properties of bitumen and the grain composition of mineral materials are presented in Table 1 and Table 2, respectively.
At the same time, in a number of works it is noted [26…28] that the process of bitumen self-healing can occur at the molecular level due to reversible hydrogen bonding with the formation of new crosslinks and chains through ditopic and tritopic molecules [28].
In the relaxation theory of adhesion [35], the influence of the processes of occurrence of internal stresses and deformations on the adhesion strength is considered, which is expressed in a change in the number of bonds that provide adhesion.
At the same time, in a number of works it is noted [26…28] that the process of bitumen self-healing can occur at the molecular level due to reversible hydrogen bonding with the formation of new crosslinks and chains through ditopic and tritopic molecules [28].
In the relaxation theory of adhesion [35], the influence of the processes of occurrence of internal stresses and deformations on the adhesion strength is considered, which is expressed in a change in the number of bonds that provide adhesion.
Online since: December 2009
Authors: Hassan Farhangi, E. Mahmudi
Since the material
undergoes severe plastic deformation at high temperatures, the FSW process generates a fine grain
structure in the centre of welds, which has been ascribed to dynamic recrystallisation.
Furthermore, in a number of studies [12-14] the tensile properties and fracture location of various aluminium alloys have been studied.
The resulting zigzag hardness profile presented in Fig. 8 clearly shows that the hardness number is higher in the particle rich bands under all welding conditions, which is consistent with the hardening effects of secondary particles.
Furthermore, in a number of studies [12-14] the tensile properties and fracture location of various aluminium alloys have been studied.
The resulting zigzag hardness profile presented in Fig. 8 clearly shows that the hardness number is higher in the particle rich bands under all welding conditions, which is consistent with the hardening effects of secondary particles.
Online since: July 2011
Authors: Bernard Viguier, Eric Andrieu, Fabienne Touratier, Christophe Siret, Sandrine Lesterlin
The unique properties of these single grained superalloys is due to the ordered γ' phase that precipitates in the solid solution γ matrix.
That is the number of vacancies created by unit time dN/dt multiplied by the atomic volume Ω : . (3) Since all those vacancies must be removed a vacancy flow due to climb Φclimb is established through the raft surface S : . (4) The vacancies flux can be estimated by using the microstructural and mechanical data, after creep experiments at 1150°C.
We may show in a forthcoming paper [17] that the number of sinks, that is the density of a[010] dislocations in the ordered phase, is a more crucial point.
That is the number of vacancies created by unit time dN/dt multiplied by the atomic volume Ω : . (3) Since all those vacancies must be removed a vacancy flow due to climb Φclimb is established through the raft surface S : . (4) The vacancies flux can be estimated by using the microstructural and mechanical data, after creep experiments at 1150°C.
We may show in a forthcoming paper [17] that the number of sinks, that is the density of a[010] dislocations in the ordered phase, is a more crucial point.
Online since: October 2014
Authors: Norbert Randl, Tamás Mészöly
The maximum grain size was 0.4 mm.
A total number of 15 cores were drilled in horizontal direction parallel (“L”) and perpendicular (“H”) to the beam axis and in vertical direction (“V”), which is parallel to the casting direction.
The number of cracks was already larger at 50 kN with 1% fiber content compared to the beams with 2% of fibers.
A total number of 15 cores were drilled in horizontal direction parallel (“L”) and perpendicular (“H”) to the beam axis and in vertical direction (“V”), which is parallel to the casting direction.
The number of cracks was already larger at 50 kN with 1% fiber content compared to the beams with 2% of fibers.
Online since: December 2013
Authors: Ai Qin Shen, Jian Wang, Hong Ji Zhao, Yinchuan Guo
Table 1 Tianshan Ordinary Portland Cement Index
Loss on Ignition [%]
MgO [%]
SO3[%]
Cl- [%]
Specific Surface Area [m2/Kg]
2.52(≤5.0)
2.44(≤5.0)
2.46(≤3.5)
0.03(≤0.06)
413(≥300)
Degree of Fineness [%]
Standard Consistency water [%]
Stability [mm]
Setting Time [min]
Compressive Strength [MPa]
Flexural Strength (MPa)
Initial
Final
3d
28d
3d
28d
2.8
23.5
1.5
160
225
25.0
49.3
5.2
8.3
1.2 Coarse and Fine Aggregate
The aggregates in this test are uniform solid, good grain shape, clean and meet regulatory requirements (shown in Table 2, Table 3).
Relative dynamic elastic modulus is a non-destructive testing indicators,It should be larger than 60%, as follows: (3) In the formula: P—Relative dynamic elastic modulus after n times of Freeze-thaw cycles (%); fn—Transverse fundamental frequency after n times of salt freeze cycles (Hz); f0—Transverse fundamental frequency before the test (Hz); N —the number of Freeze-thaw cycles. 3.3 Test Results Table 8 C40 Concrete Freeze-Thaw Test Data No.
Analyzed the average elastic modulus loss of C40 concrete under three different water-binder ratio, as follows Table 9: Table 9 The Orthogonal Test in the C40 of the Water Binder Ratio and Average Value of Relative Dynamic Elastic Modulus Water-binder Ratio Denudation Q [Kg/m2] Relative dynamic elastic modulus [%] Freeze-Thaw Cycles [times] Freeze-Thaw Cycles [times] 50 100 200 300 50 100 200 300 0.34 0.243 0.443 0.987 1.680 98.25 96.71 92.99 87.83 0.37 0.220 0.527 1.083 1.797 98.12 96.11 92.10 86.48 0.40 0.267 0.570 1.173 1.930 98.11 95.73 91.51 85.92 Fig. 4 Effect of water-binder ratio on the frost resistance of concrete The research indicates that: (1) With the decrease of water binder ratio, the deicer-frost resistance of concrete is increasing gradually, mainly for the number of frozen at different salt, concrete relative dynamic elastic modulus loss and erosion amount decreased; (2) When water binder ratio increased from 0.34 to 0.40, with the increasing times of freeze-thaw
Relative dynamic elastic modulus is a non-destructive testing indicators,It should be larger than 60%, as follows: (3) In the formula: P—Relative dynamic elastic modulus after n times of Freeze-thaw cycles (%); fn—Transverse fundamental frequency after n times of salt freeze cycles (Hz); f0—Transverse fundamental frequency before the test (Hz); N —the number of Freeze-thaw cycles. 3.3 Test Results Table 8 C40 Concrete Freeze-Thaw Test Data No.
Analyzed the average elastic modulus loss of C40 concrete under three different water-binder ratio, as follows Table 9: Table 9 The Orthogonal Test in the C40 of the Water Binder Ratio and Average Value of Relative Dynamic Elastic Modulus Water-binder Ratio Denudation Q [Kg/m2] Relative dynamic elastic modulus [%] Freeze-Thaw Cycles [times] Freeze-Thaw Cycles [times] 50 100 200 300 50 100 200 300 0.34 0.243 0.443 0.987 1.680 98.25 96.71 92.99 87.83 0.37 0.220 0.527 1.083 1.797 98.12 96.11 92.10 86.48 0.40 0.267 0.570 1.173 1.930 98.11 95.73 91.51 85.92 Fig. 4 Effect of water-binder ratio on the frost resistance of concrete The research indicates that: (1) With the decrease of water binder ratio, the deicer-frost resistance of concrete is increasing gradually, mainly for the number of frozen at different salt, concrete relative dynamic elastic modulus loss and erosion amount decreased; (2) When water binder ratio increased from 0.34 to 0.40, with the increasing times of freeze-thaw
Online since: November 2015
Authors: Paweł Niewiadomski, Damian Stefaniuk
Portland cement CEM I 52.5R, superplasticizer Glenium Sky 600 with a density of 1.06 g/cm3 in the amount of 4% of the cement weight, granite aggregate with an average density of 2.67 g/cm3 with 10-5, 5-2, 2-1, 1.2-0.5, 0.6-0.1 mm fractions and a fraction with a grain size of <0.1 mm (performing the function of a fine filler), and also mains water were used to make self-compacting concrete mixtures for the tests.
Because of the variation of the tested material it is recommended that a large number of measurements be performed so that the results can be statistically well interpreted [18].
Because of the large number of measurements, the results were statistically processed and presented as the expected value and the standard deviation.
Because of the variation of the tested material it is recommended that a large number of measurements be performed so that the results can be statistically well interpreted [18].
Because of the large number of measurements, the results were statistically processed and presented as the expected value and the standard deviation.
Online since: April 2005
Authors: Tsutomu Mashimo
Sign s means the number of components.
In the strong acceleration field region (C), large, long crystals oriented in the direction of the acceleration field whose crystal grains are several mm long and several hundreds of µm wide can be Fig. 4.
If we can increase the sample temperature by several 100s degrees, the number of covered materials will extremely increase, and the unforeseen phenomena is expected to be found.
In the strong acceleration field region (C), large, long crystals oriented in the direction of the acceleration field whose crystal grains are several mm long and several hundreds of µm wide can be Fig. 4.
If we can increase the sample temperature by several 100s degrees, the number of covered materials will extremely increase, and the unforeseen phenomena is expected to be found.
Online since: January 2014
Authors: Przemysław Osocha
There are a number of reasons for such a situation.
Conclusions A growing number of networked embedded systems in service, which take critical control functions, require that security and safety problems [12] should be treated with special attention.
Sozańska, A Comparison of Grain Quantitative Evaluation Performed with Standard Method of Imaging with Light Microscopy and EBSD Analysis, Prakt.
Conclusions A growing number of networked embedded systems in service, which take critical control functions, require that security and safety problems [12] should be treated with special attention.
Sozańska, A Comparison of Grain Quantitative Evaluation Performed with Standard Method of Imaging with Light Microscopy and EBSD Analysis, Prakt.
Online since: August 2004
Authors: Stuart R.J. Saunders, Jim P. Banks, Christopher J. Chunnilall, G. Chen
For
polycrystalline materials in the absence of any out-of-plane stress where the sample volume probed
is large compared with the grain size the frequency shift, ∆ν, of the R2 line is given by:
∆ν = 2.54 (cm-1 GPa
-1) σ (1.)
From this information and knowing the density of the pellet (82% of bulk alumina) and the cone angle (72°) of the illuminating laser light, it was possible to calculate the number of Cr ions contributing to the signal.
Discussion Piezospectroscopy has been used for a number of years as a means of measuring residual stress changes in the TGO during the ageing of TBC systems.
From this information and knowing the density of the pellet (82% of bulk alumina) and the cone angle (72°) of the illuminating laser light, it was possible to calculate the number of Cr ions contributing to the signal.
Discussion Piezospectroscopy has been used for a number of years as a means of measuring residual stress changes in the TGO during the ageing of TBC systems.