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Online since: May 2006
Authors: Manuel P.F. Graça, Manuel A. Valente, Maria Gracinda Ferreira da Silva
The analytical background, used in the electrical data analysis, was as follows: a) The Arrhenius
expression [2,9,15] has been used to fit the temperature dependence of the ac and dc conductivities
(Eq.1):
−=
Tk
E
Baexp0σσ
(1)
where σ0 is a pre-exponential factor, Ea the activation energy, kB the Boltzmann constant and T the
temperature for the ac and dc values; b) The complex permittivity, ε*=ε´+jε´´, was calculated
through the sample impedance measurements, knowing that Z
*=1/(µε*) (where µ=jωC0, ω is the
angular frequency, C0 the admittance of the empty cell and 1−=j ) [15]
Results
10 20 30 40 50 60 70 80
2 theta
Intensity (arb. units)
700
650
800
750
x
x
x x x
x
x x
x - NaNbO3
Fig. 1 XRD spectra of the heat-treated samples.
The 800ºC treated sample presents, comparatively with the 750ºC sample, a reduction in the particle number but an increase in their size (Fig.2d).
The 800ºC treated sample presents, comparatively with the 750ºC sample, a reduction in the particle number but an increase in their size (Fig.2d).
Online since: July 2012
Authors: M. Gherib, A. Otmani, A. Djekoun, A. Bouasla, M. Poulain, M. Legouira
In this study, we have adopted the Rietveld’s powder structure refinement analysis [15-19] of X-ray powder diffraction data to obtain the refined structural parameters, such, lattice parameters etc. and microstructure parameters, such as particle size and residual micro strains (r.m.s) of lattice.
This can be explained by the important reduction of the crystallite size and the introduction of an important amount of lattice defects at this stage, which enhances the diffusivity of the Al atoms into the Ni matrix.
This can be explained by the important reduction of the crystallite size and the introduction of an important amount of lattice defects at this stage, which enhances the diffusivity of the Al atoms into the Ni matrix.
Online since: December 2010
Authors: Terence G. Langdon, Praveen Kumar
For example, significant strengthening at room temperature was observed in a range of commercial aluminum-based alloys processed through ECAP but each alloy, without exception, exhibited a major reduction in the ductility [4].
First, the testing strain rate is not as high as the strain rate used for the data shown in Fig. 2 which marked the onset of higher strength and good ductility.
First, the testing strain rate is not as high as the strain rate used for the data shown in Fig. 2 which marked the onset of higher strength and good ductility.
Online since: March 2011
Authors: Mathias Liewald, Christoph Albiez, Andreas Görres, Jochen Regensburger
Fig. 1: Assessment of the surface quality after coating process [Audi]
The essential reduction of costs, weight, fuel consumption and CO2 emission, is only possible through consequent combination of material-, shape-, manufacturing- and construction lightweight concepts.
Furthermore, the anisotropic and hardening characteristic values as well as the young’s modulus according to Fig. 4, are described in temperature depending data.
Furthermore, the anisotropic and hardening characteristic values as well as the young’s modulus according to Fig. 4, are described in temperature depending data.
Online since: May 2011
Authors: Yun Xia Lun, Shao Shun Liu, Ming Kai Zhou, Xiao Fan Liu
Accelerating hydration of expansion components results in the disintegration of partial particles and the reduction of grain size of steel slag under hydrothermal condition.
Results and Discussion Content of free CaO is a very important data for volume stability of steel slag because of solid-phase volume increment of 97.72% when it hydrated.According to the equation (1), the content of free CaO can be calculated as shown in table 1.
Results and Discussion Content of free CaO is a very important data for volume stability of steel slag because of solid-phase volume increment of 97.72% when it hydrated.According to the equation (1), the content of free CaO can be calculated as shown in table 1.
Online since: July 2011
Authors: Yu Yan Liu, Xing Qian Li, Zi Li Jin
According to single, dual-pass experiment data, we establish multi-pass experiment project.
Table 3 Experiment technology of multi-pass compression tests Roll pass Distortion temperature ˚C Relative reduction / % Strain velocity /s-1 Time between passes/s program a b c a b c a b c 1 1060 45 45 45 3.673 3.673 3.673 2 980 40 45 45 7.539 9.004 9.004 15.49 15.49 15.49 3 940 38 40 35 15.111 18.482 15.475 4.65 4.26 4.26 4 900 38 35 35 35.741 38.447 34.097 2.88 2.56 2.77 5 860 32 27 32 59.068 54.723 58.408 1.79 1.66 1.80 2.3.2 Result analysis of multi-pass rolling Fig.6.
Table 3 Experiment technology of multi-pass compression tests Roll pass Distortion temperature ˚C Relative reduction / % Strain velocity /s-1 Time between passes/s program a b c a b c a b c 1 1060 45 45 45 3.673 3.673 3.673 2 980 40 45 45 7.539 9.004 9.004 15.49 15.49 15.49 3 940 38 40 35 15.111 18.482 15.475 4.65 4.26 4.26 4 900 38 35 35 35.741 38.447 34.097 2.88 2.56 2.77 5 860 32 27 32 59.068 54.723 58.408 1.79 1.66 1.80 2.3.2 Result analysis of multi-pass rolling Fig.6.
Online since: October 2012
Authors: Xiao Long Lü, Shuang Jiang Lü, Qi Jun Gao
Introduction
Membrane distillation (MD) is an important technology to realize the utilization of wastewater resources, water saving and emission reduction [1-3].
Data Processing. (1) The equivalent flux J, kg·m-2·h-1, was calculated as following: (1) where is the increase of the total water production in the measurement time, kg, and S is effective membrane area in main evaporation zone, m2, and t is the measurement time, h
Data Processing. (1) The equivalent flux J, kg·m-2·h-1, was calculated as following: (1) where is the increase of the total water production in the measurement time, kg, and S is effective membrane area in main evaporation zone, m2, and t is the measurement time, h
Online since: August 2014
Authors: Wei Zhang
This paper proposes the use of produced water sewage treatment for desalination of sea sand , sand can be fully washed river sand while achieving reduction in fresh water usage and purpose .
Compressive strength data shows that when the chloride ion did not deal with sand to a certain extent , the strength of concrete and the concrete has a significant difference of ordinary river sand .
Compressive strength data shows that when the chloride ion did not deal with sand to a certain extent , the strength of concrete and the concrete has a significant difference of ordinary river sand .
Online since: August 2014
Authors: Stanislav Fabian, Štefánia Salokyová
Fig. 2 The Presiselect device for abrasive sieving
Hardware and software for data processing
Hardware
For the scanning of vibrations a miniature piezoelectric accelerometer manufactured by Brüel & Kjær type: 4507-B-004 was used.
- with the increasing numerical value of sieved abrasive mass flow in the studied range the vibrations acceleration amplitude periodically increases and compared to the abrasive mass flow of 200 and 600 g/min it increased by 20.42 % - with the increasing numerical value of non-sieved abrasive mass flow in the studied range the vibrations acceleration amplitude at first decreases to a minimum value of 0.326 mg at mass flow of 400 g/min and then it slightly increases - compared to the mass flow 200 g/min and 400 g/min of non-sieved abrasive is the vibrations acceleration amplitude reduced by 27.07 % - with the increasing mass flow numerical value of sieved abrasive in comparison to non-sieved in the studied range is the vibrations acceleration amplitude significantly reduced from value of 1.425 mg to value of 0.326 mg at mass flow of 400 g/min and at mass flow of 600 g/min from value of 1.425 mg to value of 0.347 mg - in comparison of sieved and non-sieved abrasive is the biggest reduction
- with the increasing numerical value of sieved abrasive mass flow in the studied range the vibrations acceleration amplitude periodically increases and compared to the abrasive mass flow of 200 and 600 g/min it increased by 20.42 % - with the increasing numerical value of non-sieved abrasive mass flow in the studied range the vibrations acceleration amplitude at first decreases to a minimum value of 0.326 mg at mass flow of 400 g/min and then it slightly increases - compared to the mass flow 200 g/min and 400 g/min of non-sieved abrasive is the vibrations acceleration amplitude reduced by 27.07 % - with the increasing mass flow numerical value of sieved abrasive in comparison to non-sieved in the studied range is the vibrations acceleration amplitude significantly reduced from value of 1.425 mg to value of 0.326 mg at mass flow of 400 g/min and at mass flow of 600 g/min from value of 1.425 mg to value of 0.347 mg - in comparison of sieved and non-sieved abrasive is the biggest reduction
Online since: January 2014
Authors: Olga Stepanova, Xeniya Ryabkina
This is clearly seen in Fig. 3, where data of the specific energy input of Ar+ ions in Al, Cu, and W targets are presented at the same irradiation mode.
A considerable growth of Wm results from the reduction of the beam diameter, i.e. with increasing beam current density.
A considerable growth of Wm results from the reduction of the beam diameter, i.e. with increasing beam current density.