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Online since: September 2005
Authors: Jürgen Hirsch
Earing measurement is a typical quality measure for plastic anisotropy of sheets,
where the anisotropy can be expressed in a single number 'Z' = ∆ h / h0 of the relative height of ears
to troughs /3/.
This number must usually be minimised in sheet production to ensure optimum production performance, e.g. in can manufacturing processes.
The first (weak) ß-fibre intensities are mainly formed by the rotation of initially randomly orientated grains.
However, then also the 0°/180° ears would increase and also the early and faster drop of 90°/270° must be extrapolated, i.e. a six ear problem might occur QUANTITATIVE DESCRIPTION OF DEEP DRAWN CUP PROFILES Due to its characteristic harmonic symmetry earing profiles (along αααα) can quantitatively be described by a small number of even (cosinus) Fourier series expansion coefficients in the form : h (αααα) = ΣΣΣΣn fn * cos (nαααα) , expansion degree n = 0, 2, 4, 6 . . .
A quite small number of coefficients is sufficient for a very good agreement [4] so Fourier expansion provides a new method for an efficient and accurate description of cup profiles in aluminium sheet.
This number must usually be minimised in sheet production to ensure optimum production performance, e.g. in can manufacturing processes.
The first (weak) ß-fibre intensities are mainly formed by the rotation of initially randomly orientated grains.
However, then also the 0°/180° ears would increase and also the early and faster drop of 90°/270° must be extrapolated, i.e. a six ear problem might occur QUANTITATIVE DESCRIPTION OF DEEP DRAWN CUP PROFILES Due to its characteristic harmonic symmetry earing profiles (along αααα) can quantitatively be described by a small number of even (cosinus) Fourier series expansion coefficients in the form : h (αααα) = ΣΣΣΣn fn * cos (nαααα) , expansion degree n = 0, 2, 4, 6 . . .
A quite small number of coefficients is sufficient for a very good agreement [4] so Fourier expansion provides a new method for an efficient and accurate description of cup profiles in aluminium sheet.
Online since: August 2013
Authors: Dao Xiang Wu, Ren Bing Hua, Li Li, Gong Zhang, Yuan Jie Yang
The soil which localed above the containing water sand layer was gathered with a large number of carbonate or the calcium nodules under the effect of the ground water that rich in in long-term.
The soil is more inhomogeneity and anisotropism then the fine-grained soil because of the calcium nodules.
When there are calcareous concretions in soil, the standard penetration number is relatively high ,such as 4-48 blow in the Jieshou area.
But when there is little calcareous concretions, the number is relatively low, such as 6-15 blow.
Standard penetration number containing the calcareous concretions is 3-72 blow ,but 3-20 blow without the calcareous concretions.
The soil is more inhomogeneity and anisotropism then the fine-grained soil because of the calcium nodules.
When there are calcareous concretions in soil, the standard penetration number is relatively high ,such as 4-48 blow in the Jieshou area.
But when there is little calcareous concretions, the number is relatively low, such as 6-15 blow.
Standard penetration number containing the calcareous concretions is 3-72 blow ,but 3-20 blow without the calcareous concretions.
Online since: September 2008
Authors: Erika Furlani, Eleonora Aneggi, Stefano Maschio
Due to such a wide range of applications, zirconia based materials have received a great deal of
attention by researchers and a great number of papers is available on the subject, many of which
dealing with the synthesis of zirconia powders and the production of zirconia monoliths and their
properties.
On the other hand, the production of submicronic grain sized monoliths is impossible if the particles of the starting powders are not submicronic as well; secondly, if structural tools are to be produced, powders must possess a good sintering behaviour in order to minimize an undesired residual porosity.
During these critical preparation steps a great number of parameters, i.e. type of precursor (organic-inorganic), aspect (powder-solution), concentration, processing temperature and many others, must be carefully controlled.
A procedure that enables the reduction of such a great number of parameters making the production of powders with constant properties easier could be worthwhile.
Also in this measurement PSD is narrowed after 1h of milling; a longer milling time does not greatly improve the number of small particles.
On the other hand, the production of submicronic grain sized monoliths is impossible if the particles of the starting powders are not submicronic as well; secondly, if structural tools are to be produced, powders must possess a good sintering behaviour in order to minimize an undesired residual porosity.
During these critical preparation steps a great number of parameters, i.e. type of precursor (organic-inorganic), aspect (powder-solution), concentration, processing temperature and many others, must be carefully controlled.
A procedure that enables the reduction of such a great number of parameters making the production of powders with constant properties easier could be worthwhile.
Also in this measurement PSD is narrowed after 1h of milling; a longer milling time does not greatly improve the number of small particles.
Online since: February 2013
Authors: Hong Jie Zeng, Lai Qi Zhang, Xin Yu He, You Cha Zhang, Pen Jia, Jun Pin Lin
The grain size distribution of air plasma spraying is wide than that of HVOF and the powder feed rate is continuously adjustable.
The number of thermal cycles was recorded and was the average of 3 measurements for every kind of sample.
The cycling number of HVOF Ti28.15Al63.4Nb8.25Y coatings reached 116 in thermal shock test, but the cycling number of APS Ti28.15Al63.4Nb8.25Y coatings was only 26.
Fig.7 Cycling number of HVOF and APS Ti28.15Al63.4Nb8.25Y coatings (a) 50 mm Spallation Spallation (b) 50 mm Fig.8 Optical photograph of coatings after thermal shock test: (a) APS coating; (b) HVOF coating Conclusions (1) HVOF Ti28.15Al63.4Nb8.25Y coatings have more uniform and compact morphology than APS Ti28.15Al63.4Nb8.25Y coating
The number of thermal cycles was recorded and was the average of 3 measurements for every kind of sample.
The cycling number of HVOF Ti28.15Al63.4Nb8.25Y coatings reached 116 in thermal shock test, but the cycling number of APS Ti28.15Al63.4Nb8.25Y coatings was only 26.
Fig.7 Cycling number of HVOF and APS Ti28.15Al63.4Nb8.25Y coatings (a) 50 mm Spallation Spallation (b) 50 mm Fig.8 Optical photograph of coatings after thermal shock test: (a) APS coating; (b) HVOF coating Conclusions (1) HVOF Ti28.15Al63.4Nb8.25Y coatings have more uniform and compact morphology than APS Ti28.15Al63.4Nb8.25Y coating
Online since: February 2015
Authors: Hui Zhi Wu, Qi Gang Jiang, Chao Jun Bai
Observations are highly consistent with the prospecting model, and there are a sufficient number of projections made with good geological background information.
Observations are highly consistent with the prospecting model, and there are a sufficient number of projections made with good geological background information.
As Figure2 shows that we delineated seven prospecting targets in the study area, and numbered them from top to bottom, left to right, according to target levels.
Remote sensing prospecting suggests that there are a large number of iron-stain and hydroxyl anomalies controlled by stratigraphy.
The main part of the wall rock is sandy slate with particles of mineralized brass developed with a grain size of about 3.0 mm.
Observations are highly consistent with the prospecting model, and there are a sufficient number of projections made with good geological background information.
As Figure2 shows that we delineated seven prospecting targets in the study area, and numbered them from top to bottom, left to right, according to target levels.
Remote sensing prospecting suggests that there are a large number of iron-stain and hydroxyl anomalies controlled by stratigraphy.
The main part of the wall rock is sandy slate with particles of mineralized brass developed with a grain size of about 3.0 mm.
Online since: March 2022
Authors: Virgil Christian G. Castillo, Erwin P. Enriquez, Ted Limpoco
For starch films, thickness was varied by changing number of layers deposited and changing the concentration of starch in solution.
DOE was also used to estimate the effect of starch solution concentration (1 or 10%), number of layers deposited (1 or 10), nitrogen concentration (0.1 or 1%), and wither with or without gold sputter coating.
AFM images of (a) 4, (b) 8 and (c) 12 layers of LbL show an increase in roughness with increasing number of layers deposited.
This limit will vary depending on the thickness of the film and the average Z number of elements in the film.
Li et al., “Crystallization characteristics and local grain abnormal growth of amorphous Ge2Sb2Te5 films induced by a Gaussian picosecond laser,” Opt.
DOE was also used to estimate the effect of starch solution concentration (1 or 10%), number of layers deposited (1 or 10), nitrogen concentration (0.1 or 1%), and wither with or without gold sputter coating.
AFM images of (a) 4, (b) 8 and (c) 12 layers of LbL show an increase in roughness with increasing number of layers deposited.
This limit will vary depending on the thickness of the film and the average Z number of elements in the film.
Li et al., “Crystallization characteristics and local grain abnormal growth of amorphous Ge2Sb2Te5 films induced by a Gaussian picosecond laser,” Opt.
Online since: December 2023
Authors: Kannan Sekar, Pandian Vasanthakumar
(a) Corrosion equipment set up, (b) Specimen
Differential scanning calorimeter test
The differential scanning calorimeter (DSC) is commonly utilized to characterize the solid-state response of materials, including phenomena such as grain growth, recrystallization, precipitation, dissolution, and phase transformations, as illustrated in Fig. 4.
Specimen numbers 9, 10, 11, and 13, as shown in Figures 6 and 7, exhibited potentials up to -0.6 eV and possessed a more cathodic or passive region.
Specimen number 8 exhibited the lowest corrosion rate in Fig. 7, likely due to the improper selection of process parameters [7-8] Fig.7 Corrosion rate of four different tool profiles–Specimen 8, 9, 10, 13 Differential scanning calorimeter DSC, a widely used thermal analysis technique, is extensively applied in the field of precipitation-hardened aluminum alloys.
Only a limited number of specimens were tested to determine the presence or absence of precipitation formation or dissolution.
In the figures, 'a' refers to the standard specimen, while 'b' to 'q' represent specimen numbers 1 to 16, and 'r' represents the base metal.
Specimen numbers 9, 10, 11, and 13, as shown in Figures 6 and 7, exhibited potentials up to -0.6 eV and possessed a more cathodic or passive region.
Specimen number 8 exhibited the lowest corrosion rate in Fig. 7, likely due to the improper selection of process parameters [7-8] Fig.7 Corrosion rate of four different tool profiles–Specimen 8, 9, 10, 13 Differential scanning calorimeter DSC, a widely used thermal analysis technique, is extensively applied in the field of precipitation-hardened aluminum alloys.
Only a limited number of specimens were tested to determine the presence or absence of precipitation formation or dissolution.
In the figures, 'a' refers to the standard specimen, while 'b' to 'q' represent specimen numbers 1 to 16, and 'r' represents the base metal.
Online since: February 2007
Authors: Masaru Ueno, Junji Ikeda, Mikio Iwamoto, Giuseppe Pezzotti
The
earlier generation zirconia heads were not subjected to Hot-Isostatic-Press (HIP) treatment and the
average grain size was approximately 0.3 µm.
Tetragonal Monoclinic Transformation c) Wave number (cm-1) Intensity (a.u.)
Tetragonal Monoclinic Transformation c) Wave number (cm-1) Intensity (a.u.)
a) b) 800 600 400 200 Tetragonal Monoclinic Transformation c) Wave number (cm-1) Intensity (a.u.)
a) b) 800 600 400 200Wave number (cm-1) Intensity (a.u.)
Tetragonal Monoclinic Transformation c) Wave number (cm-1) Intensity (a.u.)
Tetragonal Monoclinic Transformation c) Wave number (cm-1) Intensity (a.u.)
a) b) 800 600 400 200 Tetragonal Monoclinic Transformation c) Wave number (cm-1) Intensity (a.u.)
a) b) 800 600 400 200Wave number (cm-1) Intensity (a.u.)
Online since: April 2019
Authors: Vera Pelantová
Their relationships and the influence of the substantial neighbourhood lead to the development of a number of problems.
However, organisations often face a number of nonconformities.
There were five small and medium sized organisations and six large organisations according to the number of employees.
This way the number of these nonconformities about material and product problems can decline.
Coarse grains and colour stains appear due to inappropriate added ingredients often in an effort to save up the material in the food industry and in the plastic industry.
However, organisations often face a number of nonconformities.
There were five small and medium sized organisations and six large organisations according to the number of employees.
This way the number of these nonconformities about material and product problems can decline.
Coarse grains and colour stains appear due to inappropriate added ingredients often in an effort to save up the material in the food industry and in the plastic industry.
Online since: December 2012
Authors: Yi Lian Li, Telesphore Kabera
The Corey function was used to get the relative permeability for free CO2 phase;
krg = (1-Sˆ )2(1-Sˆ 2) (3)
S^ = (Sl-Slr)/(1-Slr-Sgr) (4)
For the capillary pressure between the two phases the following equation was used:
Pcap = -P0([S*]-1/λ – 1)1-λ (5)
P0 = √(ø/k) (6)
Table 1
Aquifer Properties Used in Flow Simulations
Rock grain density (kg m-3)
2600
Aquifer horizontal distance (km)
21
Aquifer nett thickness (m)
110
Porosity (%)
15.4
Formation heat conductivity under fully liquid-saturated conditions (W/m°C)
2.51
Rock grain specific heat (J/kg°C)
920
Aquifer initial temperature (°C)
89
CO2 injection temperature (°C)
45
Aquifer initial pressure (bar)
220
CO2 injection pressure (bar)
270
Salinity (mass fraction)
0.29
Rock compressibility (Pa-1)
4.5 x 10-10
Liquid relative permeability, krl
√S*{1-(1-[S*]1/m)m}2, S* = (Sl-Slr)/(1-Slr)
Residual water saturation, Srl
0.30
Gas relative permeability, krg
(1-Sˆ )2(1-Sˆ 2), S^ = (Sl-Slr)/(1-Slr-Sgr)
Residual gas saturation
Figure 5 Gas saturation spatial distribution during CO2 sequestration (Left frames present only injection case, and the right frames represent one injection and two production case) (0.1 cut-off) Results and Discussion As it was mentioned above, while placing production wells, one has to be careful in order to prevent the risk of producing CO2, in order to achieve this, a number of simulations were performed such as placing the production well at a distance of about 7.5km from the injection, this case showed that after 200 years the CO2 mobile migrating horizontally will reach the production but when the distance was increased to about 9.5km from the injection well, even after 700 years the CO2 mobile will not reach the production well ( Figure 5).
As it is shown in figure 6 the effect of shale layers is to retard migration of CO2 mobile phase front normally depending on the number of shale layers.
Figure 5 Gas saturation spatial distribution during CO2 sequestration (Left frames present only injection case, and the right frames represent one injection and two production case) (0.1 cut-off) Results and Discussion As it was mentioned above, while placing production wells, one has to be careful in order to prevent the risk of producing CO2, in order to achieve this, a number of simulations were performed such as placing the production well at a distance of about 7.5km from the injection, this case showed that after 200 years the CO2 mobile migrating horizontally will reach the production but when the distance was increased to about 9.5km from the injection well, even after 700 years the CO2 mobile will not reach the production well ( Figure 5).
As it is shown in figure 6 the effect of shale layers is to retard migration of CO2 mobile phase front normally depending on the number of shale layers.