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Online since: December 2011
Authors: Justyna Rozwadowska, Katsuyuki Kida, Edson Costa Santos, Takashi Honda, Hitonobu Koike, Kenji Kanemasu
By changing the sample position, tests at different number of cycles can be performed on the same specimen.
Prior austenite grain size was observed in samples etched by immersion in Van Giesson picral solution, plus 2 ml of wetting agent Teepol and 2 drops of HCl for 5 minutes, followed by final polishing with Buehler’s Mastermet 2.
The prior austenite grain size was around 15 mm and the sample was formed of martensite, retained austenite (16%) and cementite (3-4%).
It is expected that once sufficient amount of test data is collected, it will be possible to correlate the inclusion depth, their minimum size and shape factors with the crack initiation process much easier than through conventional testing. 104 5μm 5μm 5μm 65 mm 250 mm 570 mm 106 5μm 5μm 5μm 110 mm 280 mm 445 mm 4.5 * 107 5μm 5μm 5μm 160 mm 280 mm 373 mm Figure 3 Cracks after one-point RCF testing (a) number of cycles = 104 (b) number of cycles = 106 and (c) number of cycles = 4.5 * 107.
From Fig. 3, it can be concluded that the higher the number of cycles, the longer the cracks.
Online since: July 1994
Therefore and for a number of additional reasons we believe that further development of line-profile decomposition methods as indicated should not be promoted; the future belongs to line-profile simulation and matching methods, where the line-profile synthesis is based on a general, flexible model for the strained solid with fitting parameters for grain size, defects and their strains as used in solid state physics, thereby lifting the constraint of adopting a part of the line broadening as independent of length of the diffraction vector ("order independent").
Both the atmosphere that emanates from the pages and the large number (350) of participants in Vienna reflect that powder diffraction is an area of important activity in materials science.
Edi torial Notes Also this time a number of contributions, in particular from countries of eastern Europe. had to be retyped completely because even the formatting was not in order.
We state Lhis explicitly because we believe that it must be possible for anybody. even if only poor typing/printing/word-processing facilities are available. to comply at least with the prescribed number of pages and the prescribed format of the text area.
Reviewing the proceedings of EPDIC I. 2 and 3 . it is striking that the number of papers in Part I is decreasing whereas the number of contributions in Part 2 remains a pproximately cons tant.: their ratio decreases from I via 0.7 lo 0.5 now.
Online since: May 2011
Authors: Bao Chen Liu, Bin Jie Zhao, Zhan Fei Gu, Chun Mei Mu, Zhi Kui Liu
Generally speaking, when the Reynolds number is less than 2000, it’s the laminar flow.
On the contrary, when the Reynolds number is greater than 2000, it’s the turbulent flow.
Calculation of Reynolds number ():
Analysis of silty sand particles (average value) Size of grain(mm) 2~0.5 0.5~0.25 0.25~0.075 <0.075 Grain composition (%) 8 27 35 30 The Geotechnical Engineering Investigation report indicates that there is an ancient collapse in the local sections of the site.
(2)Substitute relevant parameters into the formula (3), get the Reynolds number (Re) of groundwater
Online since: September 2017
Authors: Andrey N. Anikeev, Ilia V. Chumanov
The steels used in the manufacture of responsible machines components and constructions should have a close-grained structure, since in this case they have a higher mechanical properties complex in comparison with coarse-grained structure steels [7, 8].
To the count of number particles in each specimen was selected area of size 20×20 mm in 3 areas: the outside edge, central part and inside edge casting, due to different conditions of metal crystallization in centrifuging [13].
The data obtained about the number particles in the 3 areas (outside edge, central part and inside edge) of each specimen are presented in (Table 1) and (Fig. 1).
The number of dispersion particles in the specimens.
Acknowledgements Work performed under the state order of the Ministry of Education and Science №14.577.21.0185 (unique number RFMEFI57715X0185).
Online since: June 2014
Authors: Jun Guo, Xiang Wei Duan, Wei Chang Shen
By using different number of iterations, can generate different function value.
MPI is suitable for the machine process level between nodes more coarse-grained parallel, so can be applied to single mononuclear, single multi-core processing large amount of calculation, less communication between nodes of parallel tasks.
OpenMP is a portable multi-threaded application development of industry standards in fine-grained (loop level) and coarse-grained (function level) threading technology with high efficiency.
Calculation based on OpenMP shared memory programming to achieve the Mandelbrot set is very intuitive, the part of the calculation is divided into several parts to execute at the same time according to the number of threads.
When the number of process is more than 12, the execution time of MPI is on the increase, the execution time will be the same as single process until 20 processes.
Online since: May 2012
Authors: De Fu Xu, Ying Xue Li, Hua Fang, Xiao Li Zhao, Yi Dong Guan
Results and discussion Plant number of different wetland plants Figure 1 showed that plant number of wetland plants changed from on 28th March to 14th July 2011.
So, the increased rate of plant numbers was higher in CW with earthworms than without earthworms.
Results suggested that tillering number of wetland plants was influenced by time, and the addition of earthworms could increase tillering number of wetland plants.
Therefore, the increased tillering number of wetland plants was related with earthworm excreta.
This was similar to the results observed by Eriksen-Hamel[17], who found that soybean grain and grain-N yield were significantly greater in enclosures with the largest earthworm populations than in the control enclosures that had no added earthworms.
Online since: February 2014
Authors: Iis Nurhasanah, Heri Sutanto, Priyono Priyono, Istadi Istadi
The grain size for the 6% Mn/Ga mole fraction thin film is homogeneous.
XRD pattern of GaN:Mn thin film with various Mn/Ga mole fractions The resulting wurtzite crystal structure of GaN:Mn thin film is identified using JCPDS number 02-1078.
These are due to flawed grain growth such as indicated by the red circle.
The 10% sample has the biggest grain of 197.4 nm, whereas the smallest grain size that of the 8% sample 167.9 nm dimension.
The high RMS value in the 6% sample is the result of large grain size.
Online since: December 2016
Authors: Li Mei Chen, De Feng Xu, Shu Chao Cheng, Li Fa Qinwei, Fei Xiao, tao shengnan
Introduction In China, Jilin province is both a major agricultural province and the country's important production base of commodity grain.
In recent years, with the increase of food production, the number of crop straws is also increasing year by year.
The number of crop stalk resources is huge and its type is centralized, which is very potential.
This research was financially supported by the Young start-up funding of Jilin Province department projects (serial number: 20150204029SF). 2.
This research was financially supported by the Young start-up funding of Jilin Agricultural University (serial number: 201418) References [1] F.
Online since: September 2017
Authors: Sergio Baragetti, Nedunchezhian Srinivasan, Ravi Kumar
Samples subjected to fatigue loading in NaCl environment revealed extensive secondary cracks along alpha grain boundaries.
No Environment Kt Maximum applied stress [MPa] Total number of cycles to failure 1.
SEM on polished and etched samples revealed secondary crack propagation along equi-axed alpha grain boundaries (Fig. 5b).
Furthermore, in contrast to fatigue tested samples in air, samples failed in NaCl environment revealed minimal plastic deformation during the final fracture regime, with less number of cycles before final failure.
Online since: November 2005
Authors: Masumi Saka, Masuyuki Hasegawa, S. Uno, K. Sasagawa
The main diffusion path of atoms in polycrystalline line is the grain boundary because lattice diffusion and interface diffusion by electromigration can be neglected in comparison with the grain boundary diffusion.
A model of polycrystalline microstructure [1] is introduced to formulate the divergence of the atomic flux in the grain boundary network.
boundary by δ, d the average grain size, Qgb the activation energy for grain boundary diffusion and ∆ϕ a constant associated with the relative angle between grain boundaries.
the range of (2π/n)・(m-1)<θ<(2π/n)・m[m=1,2,・・・,n] Two-dimensional FEM analysis ・Current density distribution ・Temperature distribution Multiplied by ・Volume of element divided by n ・Time corresponding to one calculation step Change in number of atoms in each 1/n-segment Atomic density in each 1/n-segment, N* A Yes No (N *≤N*min or N* ≥N*max) exist ?
The voids selectively grow along the grain boundary in polycrystalline lines, and they result in slit-like voids extending toward the line width and linking themselves [2].
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