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Online since: January 2024
Authors: Vania Mitha Pratiwi, Lukman Noerochim, Agung Ari Wibowo, Fakhri Akbar Maulana, Hariyati Purwaningsih
Grain resistance and grain boundary resistance make to the total resistance for the NASICON electrolyte.
Grain resistance and grain boundary resistance exhibit responses in the high- and mid-frequency ranges, respectively.
The ionic conductivity increases with the number of charge carrier ions.
This influences the sample's ionic conductivity, with increased densification directly enhancing ionic conductivity by decreasing grain resistance and grain boundaries.
Grain resistance and grain boundary resistance exhibit responses in the high- and mid-frequency ranges, respectively.
The ionic conductivity increases with the number of charge carrier ions.
This influences the sample's ionic conductivity, with increased densification directly enhancing ionic conductivity by decreasing grain resistance and grain boundaries.
Online since: August 2013
Authors: Cui Song Yu, Xiao Na Guo, Cong Qi Zheng, Lin Lin Liu, Mei Hua Song
Calculate the number of occurrences of dual value and assign, significance level, a value.
Equipped with hydrological sequence (t=1,2,…,n), its flourier series is: Besides, is the average of, is the number of harmonics,, , are the harmonic of the flourier coefficient (amplitude). , are corresponding to the harmonic of angular frequency and phase respectively; is the corresponding period of frequency and.
The Zhuzhaoxin River basin, which is located in Shandong province, is the commodity grain base, one of the major grain production areas.
The number of a dual values k=488, taking the significance level , and generating into the formula (2-1), .So trends components existed.
Equipped with hydrological sequence (t=1,2,…,n), its flourier series is: Besides, is the average of, is the number of harmonics,, , are the harmonic of the flourier coefficient (amplitude). , are corresponding to the harmonic of angular frequency and phase respectively; is the corresponding period of frequency and.
The Zhuzhaoxin River basin, which is located in Shandong province, is the commodity grain base, one of the major grain production areas.
The number of a dual values k=488, taking the significance level , and generating into the formula (2-1), .So trends components existed.
Online since: July 2007
Authors: M.G. Sagdieva, S.I. Borminskiy, K.S. Sanakulov, O.P. Vasilenok
Cultivation of bacteria was conducted on medium 9K, using shaker with 180 rpm and temperature 28-30
0C, S:L=1:10, number of bacteria was determined with
a serial tenfold dilutions.
Using described above method of bacterial cultivation, during 15 days we obtained 150 m3 of culture broth with cell number 10 9 cells/ml and more, oxidizing Fe 2+ for 24-36 hours.
Nevertheless, number of iron-oxidizing bacteria stabile remained on the level 10 8-9cells/ml.
As curves show, amount of А. ferrooxidans for 28 months of test period increases from 10 1cells/g to 10 8cells/g, А. thiooxidans - from 10 2cells/g to 10 5cells/g, while number of H.
Carried out mineralogical researches of initial flotation tailings and cakes after BL show that during BL the oxidation of different kinds of chalcopyrite, both as separate mineral and as grains in pyrite composition (Fig. 2) was observed.
Using described above method of bacterial cultivation, during 15 days we obtained 150 m3 of culture broth with cell number 10 9 cells/ml and more, oxidizing Fe 2+ for 24-36 hours.
Nevertheless, number of iron-oxidizing bacteria stabile remained on the level 10 8-9cells/ml.
As curves show, amount of А. ferrooxidans for 28 months of test period increases from 10 1cells/g to 10 8cells/g, А. thiooxidans - from 10 2cells/g to 10 5cells/g, while number of H.
Carried out mineralogical researches of initial flotation tailings and cakes after BL show that during BL the oxidation of different kinds of chalcopyrite, both as separate mineral and as grains in pyrite composition (Fig. 2) was observed.
Online since: March 2015
Authors: Sergey Lezhnev
Introduction
One of the most promising directions in the field of production of high-quality metals and alloys is the formation of these metals and alloys ultrafine-grained (UMG) structures by methods of severe plastic deformation.
However, despite the numerous developments, the most modern methods of implementation of intensive plastic deformation amount of the deformable metal have a number of significant limitations in the aspect of continuity and performance of technological schemes.
The purpose of this work, which was carried out in the framework of the state budget theme "Research and development of a combined process of deformation “pressing - drawing" with the aim of obtaining aluminum and copper wire with high mechanical properties and ultrafine-grained structure" for the program "Grant financing of scientific research for 2012-2014", is evaluation of quality of aluminum wire, deformed according to the proposed scheme of deformation “pressing - drawing".
Table 1 shows that using the proposed combined technology "pressing-drawing" the number of bends and values of hardness have higher values compared to the use of traditional drawing.
Then the composite measure of quality K0 calculated according to the formula: , (1) where - sum of all individual quality criteria Ki; n –number of unit quality criteria Ki.
However, despite the numerous developments, the most modern methods of implementation of intensive plastic deformation amount of the deformable metal have a number of significant limitations in the aspect of continuity and performance of technological schemes.
The purpose of this work, which was carried out in the framework of the state budget theme "Research and development of a combined process of deformation “pressing - drawing" with the aim of obtaining aluminum and copper wire with high mechanical properties and ultrafine-grained structure" for the program "Grant financing of scientific research for 2012-2014", is evaluation of quality of aluminum wire, deformed according to the proposed scheme of deformation “pressing - drawing".
Table 1 shows that using the proposed combined technology "pressing-drawing" the number of bends and values of hardness have higher values compared to the use of traditional drawing.
Then the composite measure of quality K0 calculated according to the formula: , (1) where - sum of all individual quality criteria Ki; n –number of unit quality criteria Ki.
Online since: February 2018
Authors: Wen Jiang Qiang, Ye Meng, Jing Qin Pang
Yang et al.[16] studied the relationship between the laminated number and laminated thickness of Al2O3-TiC/Al2O3-TiC-CaF2 self-lubricating laminated ceramic.
Each layer was loaded axially with a pressure of 20MPa.The preform structure is shown in Fig. 1.Layer A and B was different weight fractions ofCNTs/HAP composites powder,the number of layers and thickness of each layer was shown in Table 1.
The CNTs is not detected, the reason may be due to the agglomeration phenomenon of small grains, which lead to the diffraction peak broadening and becoming less obvious.
The grains are transformed from desultory, tightly packed into regular grains.
Jana Kovi, Microwave sintering of fine grained HAP and HAP/TCP bioceramics, CERAM INT. 36 (2010) 595-603
Each layer was loaded axially with a pressure of 20MPa.The preform structure is shown in Fig. 1.Layer A and B was different weight fractions ofCNTs/HAP composites powder,the number of layers and thickness of each layer was shown in Table 1.
The CNTs is not detected, the reason may be due to the agglomeration phenomenon of small grains, which lead to the diffraction peak broadening and becoming less obvious.
The grains are transformed from desultory, tightly packed into regular grains.
Jana Kovi, Microwave sintering of fine grained HAP and HAP/TCP bioceramics, CERAM INT. 36 (2010) 595-603
Online since: June 2017
Authors: Ryuichiro Ebara, Keiji Yanase, Fumito Kawamura, Masazumi Miura
Introduction
During the economic growth era after World War II, a number of steel infrastructures such as bridges, towers and pressure vessels were constructed in Japan.
A number of studies have been conducted to investigate the fracture toughness of structural steels.
However, there are a limited number of studies for long-term used structural steels.
However, all the specimens were composed of ferrite and pearlite and significant difference in grain size was not observed.
Technically, chemical compositions, microstructure (e.g., grain refinement, phase-transformation hardening etc.) and work hardening are frequently utilized for strengthening of materials.
A number of studies have been conducted to investigate the fracture toughness of structural steels.
However, there are a limited number of studies for long-term used structural steels.
However, all the specimens were composed of ferrite and pearlite and significant difference in grain size was not observed.
Technically, chemical compositions, microstructure (e.g., grain refinement, phase-transformation hardening etc.) and work hardening are frequently utilized for strengthening of materials.
Online since: June 2014
Authors: Unueroh Ufuoma Georgina, Basil Onyekpe
Hardenability is said to increase with increasing austenite grain size, because the grain boundary area is decreasing and this results in the reduction of the sites for the nucleation of ferrite and cementite.
At 8300C, the grains were fully in the austenite region.
At further increase in the austenising temperature (10300C), there was more grain growth, thus making it coarser.
They explained their observations by grain boundary area decrease.
With decrease in the grain boundary area, the sites for the nucleation of ferrite and cementite are being reduced in number and therefore these transformations are slowed down and the hardenability increases.
At 8300C, the grains were fully in the austenite region.
At further increase in the austenising temperature (10300C), there was more grain growth, thus making it coarser.
They explained their observations by grain boundary area decrease.
With decrease in the grain boundary area, the sites for the nucleation of ferrite and cementite are being reduced in number and therefore these transformations are slowed down and the hardenability increases.
Online since: June 2011
Authors: Harvey N. Rutt, Muhamad Mat Salleh, Saafie Salleh, M.N. Dalimin
Smallest grain size of ZnS can be found in its amorphous thin films and can be prepaid by depositing on the cold substrate.
These peaks were actually the grain structures that were formed through the enlargement of nucleus during film growth.
The ZnS thin films were characterised by the present of columnar grains and the surface of the films were composed of a large number of grains with various sizes [12].
The cold deposited ZnS thin film waveguide composed of many small grains.
The small crystallites did not grow into larger grains because of lower surface energy.
These peaks were actually the grain structures that were formed through the enlargement of nucleus during film growth.
The ZnS thin films were characterised by the present of columnar grains and the surface of the films were composed of a large number of grains with various sizes [12].
The cold deposited ZnS thin film waveguide composed of many small grains.
The small crystallites did not grow into larger grains because of lower surface energy.
Online since: June 2011
Authors: Hamid Azizi-Alizamini, Militzer Matthias
Here, each grain i is prescribed by its own phase field parameter [i=1,…,N].
Inside grain i, is equal to 1 while it is 0 outside the grain.
At the interface between two grains, i and j, there is a gradual change of the two corresponding phase field parameters from 0 to 1 with or in a more generalized form holds at each point, r, in the simulation domain with a total number of N grains.
The phases considered here are ferrite, austenite and cementite and there is only a driving pressure term provided grains i and j have a different phase.
Interfacial properties depend only on the phases of neighbouring grains, i.e. no effects of crystallographic orientation are included in the simulations.
Inside grain i, is equal to 1 while it is 0 outside the grain.
At the interface between two grains, i and j, there is a gradual change of the two corresponding phase field parameters from 0 to 1 with or in a more generalized form holds at each point, r, in the simulation domain with a total number of N grains.
The phases considered here are ferrite, austenite and cementite and there is only a driving pressure term provided grains i and j have a different phase.
Interfacial properties depend only on the phases of neighbouring grains, i.e. no effects of crystallographic orientation are included in the simulations.
Online since: August 2014
Authors: Pedro Brito, Haroldo Cavalcanti Pinto, Rogério Varavallo, Jose Olivas, Vitor de Melo Moreira, Vinicius Paes
The temperature was selected in order to minimize microstructure modifications (e. g. grain growth, phase transformations) of both materials.
Observation of Fig. 1 indicates that the AL-6XN base material is formed of large equiaxed austenite grains.
The microstructure of the SA516-70 base material consists of fine equiaxed ferrite grains and pearlite colonies, as seen in Fig. 2(a).
From Fig. 2(b) it can be seen that ferrite grains and pearlite colonies appear to become elongated and aligned with the interface.
This is consistent with the results presented in Fig. 3, which showed recrystallized grains near the cladded interface after heat treatment.
Observation of Fig. 1 indicates that the AL-6XN base material is formed of large equiaxed austenite grains.
The microstructure of the SA516-70 base material consists of fine equiaxed ferrite grains and pearlite colonies, as seen in Fig. 2(a).
From Fig. 2(b) it can be seen that ferrite grains and pearlite colonies appear to become elongated and aligned with the interface.
This is consistent with the results presented in Fig. 3, which showed recrystallized grains near the cladded interface after heat treatment.