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Online since: September 2017
Authors: Ksenia Syzrantseva, Vladimir Syzrantsev
The moment of appearance of the first "dark spots" and first grains of changed structure of a material of the gauge, and also their density and sizes correlate with number and amplitude of cycles.
The forecasted number of cycles (with 95 % of probability) was = 5.79mln, = 8.6mln, = 15.5mln.
When a transmission is tested at a stand the value of torque and the number of load cycles is easily fixed, moreover there is the possibility of numerous interruptions of trials of transmission with the purpose of revealing response on a surface of ISG.
This method considerably expands a range of numbers of load cycles, at which ISG response can be registered, and it makes able to eliminate a role of the subjective factor at an estimation of ISG response.
Phys. 24 Iss.9 1130-33 [8] Ono Y., Kitaoka S. 2011 Cyclic stress measurement method using grain size and occurrence rate of grown grains in electrodeposited copper foil Strain 47 Iss.2 154-161
The forecasted number of cycles (with 95 % of probability) was = 5.79mln, = 8.6mln, = 15.5mln.
When a transmission is tested at a stand the value of torque and the number of load cycles is easily fixed, moreover there is the possibility of numerous interruptions of trials of transmission with the purpose of revealing response on a surface of ISG.
This method considerably expands a range of numbers of load cycles, at which ISG response can be registered, and it makes able to eliminate a role of the subjective factor at an estimation of ISG response.
Phys. 24 Iss.9 1130-33 [8] Ono Y., Kitaoka S. 2011 Cyclic stress measurement method using grain size and occurrence rate of grown grains in electrodeposited copper foil Strain 47 Iss.2 154-161
Online since: April 2018
Authors: Marco Teller, Reinhart Poprawe, Ingo Ross, André Temmler, Moritz Küpper, Stephan Prünte, Jochen M. Schneider
Within the melt pool, the elementary distribution is homogenized as a result of thermal convection and diffusion processes, as well as a smoothed surface and a grain refinement are achieved.
Furthermore, the influence of the element homogenization and grain refinement on the area coverage of self-assembled monolayers is explored.
First results show that laser polishing of AISI D2 is suitable to achieve a reduction of grain size and a more homogeneous distribution of chromium carbides within the surface layer.
Within the melt pool, the elementary distribution is homogenized as a result of thermal convection and diffusion processes as well as a grain refinement are achieved [5].
In order to remove any topography that may hinder the assessment of the top surface and thus to improve the contrast in the SEM picture the macro laser polished specimens were manually polished with a 1 µm grain diamond suspension.
Furthermore, the influence of the element homogenization and grain refinement on the area coverage of self-assembled monolayers is explored.
First results show that laser polishing of AISI D2 is suitable to achieve a reduction of grain size and a more homogeneous distribution of chromium carbides within the surface layer.
Within the melt pool, the elementary distribution is homogenized as a result of thermal convection and diffusion processes as well as a grain refinement are achieved [5].
In order to remove any topography that may hinder the assessment of the top surface and thus to improve the contrast in the SEM picture the macro laser polished specimens were manually polished with a 1 µm grain diamond suspension.
Online since: June 2010
Authors: Bao Hong Zhu, Qi Fang Zhu, Ze Ming Sun, Tong Da Ma, Vacily A. Klimenov, Viacheslav Borozna
This nano-layer had a gradient structure with
grain size of 10 to 50nm.
Several TEM observation results [7] found that ultrasonic surface peening caused intense plastic deformation on the material surface, introduced large numbers of dislocations, grain boundary and other crystal defects in original crystals, thus breaking up the crystals.
The above two areas and matrix formed a transitional gradient structure of grain size, which is in accordance with the metallograph results.
Several TEM observation results [7] found that ultrasonic surface peening caused intense plastic deformation on the material surface, introduced large numbers of dislocations, grain boundary and other crystal defects in original crystals, thus breaking up the crystals.
The above two areas and matrix formed a transitional gradient structure of grain size, which is in accordance with the metallograph results.
Online since: July 2020
Authors: Bambang Suharno, Deni Ferdian, Nolzha Primadha Ilman, Achmad Shofi, Fajar Nurjaman
A number of researchers suggested that the selectivity of reduction depends mainly on the reduction atmosphere and sulfur content.
From the EDX results in Fig. 6, it can be identified that the white grains (point 1) are ferronickel (FeNi), the white-gray grains are troilite (FeS) (point 2), and wustite (FeO) (point 4), the dark-grey grains (point 3) are magnesioferrite, and the black grains (point 5) are nepheline.
From Fig. 6, the troilite is found surrounding the ferronickel grains.
At 950ºC, the white-gray grains referred to wustite, and they were located separately from the ferronickel grains.
The dark-gray grains (point 3) and black grains (point 5) are identified to elements, which are dominated by Al, Mg, Si, and O, considered as impurities.
From the EDX results in Fig. 6, it can be identified that the white grains (point 1) are ferronickel (FeNi), the white-gray grains are troilite (FeS) (point 2), and wustite (FeO) (point 4), the dark-grey grains (point 3) are magnesioferrite, and the black grains (point 5) are nepheline.
From Fig. 6, the troilite is found surrounding the ferronickel grains.
At 950ºC, the white-gray grains referred to wustite, and they were located separately from the ferronickel grains.
The dark-gray grains (point 3) and black grains (point 5) are identified to elements, which are dominated by Al, Mg, Si, and O, considered as impurities.
Online since: September 2013
Authors: Michela Nocetti, Paolo Burato, Michele Brunetti
In Table 1 the provenances, the nominal cross sections and the number of sampled pieces per source are reported.
Table 1 – Source, nominal cross section and number of specimens for each sample.
All the other characteristics did not show remarkable correlations, neither the slope of grain, nor the ring shake, nor the ring width.
In Table 3 the number of Structural and Rejected pieces is reported for each sample, as the results of visual grading, while in Fig. 2 the defects that led to refuse the timber elements for structural purposes are reported as percentage of the total number of Rejects.
After that, the strength profile was calculated based on a high number of tests.
Table 1 – Source, nominal cross section and number of specimens for each sample.
All the other characteristics did not show remarkable correlations, neither the slope of grain, nor the ring shake, nor the ring width.
In Table 3 the number of Structural and Rejected pieces is reported for each sample, as the results of visual grading, while in Fig. 2 the defects that led to refuse the timber elements for structural purposes are reported as percentage of the total number of Rejects.
After that, the strength profile was calculated based on a high number of tests.
Online since: October 2011
Authors: Hua Chen, Jian Liu, Tong Xue, Ren Qing Wang
The results showed that the last decade yielded an increasing number of studies on ecosystem services in China and the numbers of papers were increasing steadily after 2006.
We did not divided studied areas to provinces because some researches contained several provinces and the total number of articles is not big enough.
Results ISI based publications on ecosystem services in China The research in ISI revealed yielded an increasing number of studies on ecosystem services in China in the last decade, with a steadily growing numbers of papers since 2006 (Figure 1).
Figure 1 The number of published articles each year from 2000 to 2011 on ecosystem services in China based on ISI screening.
There are 4 papers about ecosystem services on the biggest programs in the world, including the Natural Forest Conservation Program (NFCP) and the Grain to Green Program (GTGP), the South-to-north Water Transfer Project (SNWTP), and Three Gorges Dam [8,9,10,11].
We did not divided studied areas to provinces because some researches contained several provinces and the total number of articles is not big enough.
Results ISI based publications on ecosystem services in China The research in ISI revealed yielded an increasing number of studies on ecosystem services in China in the last decade, with a steadily growing numbers of papers since 2006 (Figure 1).
Figure 1 The number of published articles each year from 2000 to 2011 on ecosystem services in China based on ISI screening.
There are 4 papers about ecosystem services on the biggest programs in the world, including the Natural Forest Conservation Program (NFCP) and the Grain to Green Program (GTGP), the South-to-north Water Transfer Project (SNWTP), and Three Gorges Dam [8,9,10,11].
Online since: February 2004
Authors: A. Gil, D. Garriga-Majo, Richard Curtis, J. Bonet, R.D. Wood, R. Said, Sven Odendahl
This necessitates a representation of the die surface using a
large number (1000s) of triangular facets and an equally large number (1000s) of triangular
membrane or solid finite elements to model the sheet surface.
In Eq. 12 the pressure ()p t is an additional unknown over the number of unknowns x .
With the exception of the initial grain size no attempt has been made to re-evaluate the various constitutive parameters provided in [11].
To determine the initial grain size a five hole test has been developed, [13].
Grant numbers GR/M/71244 and GR/M7/1282 and NASA Langley Research Center for use of the NASA General Purpose Solver.
In Eq. 12 the pressure ()p t is an additional unknown over the number of unknowns x .
With the exception of the initial grain size no attempt has been made to re-evaluate the various constitutive parameters provided in [11].
To determine the initial grain size a five hole test has been developed, [13].
Grant numbers GR/M/71244 and GR/M7/1282 and NASA Langley Research Center for use of the NASA General Purpose Solver.
Online since: August 2016
Authors: Thomas Ebel, Anok Babu Nagaram
Grain size measurement was conducted using the method linear intercept technique (ASTM E112-96).
For grain size measurements, specimens were etched with Kroll’s etching agent (96 ml distilled water, 6 ml HNO3 and 2 ml HF) for 12 sec for enhancing the visibility of the grain boundaries.
In Fig.4(a) a high amount of carbide precipitates is clearly visible, whereas, with the increase in zirconium content number and size of the carbides decreased as seen in Fig.4(b).
Fig.5 Grain size measurements of Ti-22Nb-(0, 2, 4, 6, 8, 10)Zr alloys With the increase in zirconium content small effect of grain refinement is observed.
Furthermore, the decreasing grain size as seen in Fig.5 may also influence the strength of the alloy.
For grain size measurements, specimens were etched with Kroll’s etching agent (96 ml distilled water, 6 ml HNO3 and 2 ml HF) for 12 sec for enhancing the visibility of the grain boundaries.
In Fig.4(a) a high amount of carbide precipitates is clearly visible, whereas, with the increase in zirconium content number and size of the carbides decreased as seen in Fig.4(b).
Fig.5 Grain size measurements of Ti-22Nb-(0, 2, 4, 6, 8, 10)Zr alloys With the increase in zirconium content small effect of grain refinement is observed.
Furthermore, the decreasing grain size as seen in Fig.5 may also influence the strength of the alloy.
Online since: January 2005
Authors: Ralph W. Bruce, Arne W. Fliflet, L.K. Kurihara, D. Lewis III, R.L. Bruce
Microwave and millimeter-wave heating offer a number of significant advantages in material
processing over more conventional techniques.
The last has a number of significant technological advantages that will be discussed later.
We employ such rapid sintering cycles to minimize grain growth in nanophase precursors to obtain very grain size products or to control other thermally activated processes.
In some cases, these nanophase materials have unique properties as a result of the very fine grain size.
Rapid sintering can be used to preserve very fine grain size in components sintered from nanophase precursors.
The last has a number of significant technological advantages that will be discussed later.
We employ such rapid sintering cycles to minimize grain growth in nanophase precursors to obtain very grain size products or to control other thermally activated processes.
In some cases, these nanophase materials have unique properties as a result of the very fine grain size.
Rapid sintering can be used to preserve very fine grain size in components sintered from nanophase precursors.
Online since: March 2016
Authors: Fang Hong Sun, Bin Shen, Xin Chang Wang, Xiao Tian Shen, Tian Qi Zhao
Due to the fact that the bending strength of the thin wire is difficult to be measured, this parameter is approximately evaluated by the bending number required for breaking the wire in a 30° bending test.
Furthermore, because it’s inconvenient to measure the surface hardness of the coated wire, the coated W plane sample covered by the MCD film with similar grain size and thickness is additionally fabricated, and the nanoindentation tester (TriboIndenter) is applied for measuring the microhardness and elastic modulus of the surface film.
Results and Discussions Surface and cross-sectional morphologies of the diamond coated wire fabricated using the new jig (NW) are presented in Fig.2c and Fig.2d, demonstrating that along both the axial and circumference directions, uniform MCD films with similar diamond grain size (2~3 μm) and thickness (4~5 μm) have indeed obtained.
Moreover, columnar growth structures of as-deposited MCD films obviously observed from cross-sectional morphologies indicates that the grain size of the MCD film will gradually grow up with increasing the growth time, in consequence, larger diamond grains can be accordingly obtained if necessary.
Moreover, simple bending tests are also conducted on the three types of wires (Φ0.5 mm), providing relative values of their bending strength (bending number required for breaking the wire), still shown in Table 2.
Furthermore, because it’s inconvenient to measure the surface hardness of the coated wire, the coated W plane sample covered by the MCD film with similar grain size and thickness is additionally fabricated, and the nanoindentation tester (TriboIndenter) is applied for measuring the microhardness and elastic modulus of the surface film.
Results and Discussions Surface and cross-sectional morphologies of the diamond coated wire fabricated using the new jig (NW) are presented in Fig.2c and Fig.2d, demonstrating that along both the axial and circumference directions, uniform MCD films with similar diamond grain size (2~3 μm) and thickness (4~5 μm) have indeed obtained.
Moreover, columnar growth structures of as-deposited MCD films obviously observed from cross-sectional morphologies indicates that the grain size of the MCD film will gradually grow up with increasing the growth time, in consequence, larger diamond grains can be accordingly obtained if necessary.
Moreover, simple bending tests are also conducted on the three types of wires (Φ0.5 mm), providing relative values of their bending strength (bending number required for breaking the wire), still shown in Table 2.