Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: June 2012
Authors: Shu Hui Yu, Wen Hu Yang, Ru Xu Du, Rong Sun
The free electrons could be captured by the CCTO filler because of the defects and vacancies on the grain surface, which also can be reflected by the reduction of the RB.
Thus, the number of such points can be reasonably increased with the fNi.
A single micro-sized CCTO filler is composed of a semi-conducting grain surrounded by a thin insulating or semi-conducting grain boundary.
Thus, the number of such points can be reasonably increased with the fNi.
A single micro-sized CCTO filler is composed of a semi-conducting grain surrounded by a thin insulating or semi-conducting grain boundary.
Online since: November 2023
Authors: John G. Speer, Diptak Bhattacharya, Jake A. Colburn, Jonah Klemm-Toole
Deeper cracks, and greater numbers of cracks, were also present after testing Zn-coated DH1000.
These three steels were fully austenitized during processing, with prior-austenite grain boundaries (PAGS) remaining as a characteristic of the substrate microstructure following displacive transformation.
Dissolved iron in the liquid coating should also reduce the Zn activity and influence Zn penetration of grain boundaries, consistent with the reduced LME encountered in galvannealed AHSS (having a Fe-Zn alloyed coating) in comparison to hot-dip galvanized AHSS [14-16] having a relatively unalloyed Zn coating.
Dupuy, Embrittlement of steels by liquid zinc: crack propagation after grain boundary wetting, Advanced Materials Research, 922 (2014) 161-166
These three steels were fully austenitized during processing, with prior-austenite grain boundaries (PAGS) remaining as a characteristic of the substrate microstructure following displacive transformation.
Dissolved iron in the liquid coating should also reduce the Zn activity and influence Zn penetration of grain boundaries, consistent with the reduced LME encountered in galvannealed AHSS (having a Fe-Zn alloyed coating) in comparison to hot-dip galvanized AHSS [14-16] having a relatively unalloyed Zn coating.
Dupuy, Embrittlement of steels by liquid zinc: crack propagation after grain boundary wetting, Advanced Materials Research, 922 (2014) 161-166
Online since: October 2012
Authors: Lei Tang, Wei Zhang, Ming Xiao Xie, Zhen Yu, Fan Yang
Introduction
Fluid mud is a special movement form for fine-grained cohesive sediment, and widespread phenomenon observed in muddy coast and/or estuary region.
The forming process of fluid mud can be described as follows: in salinity water, fine-grained cohesive sediment settlement is described no longer effectively by the single particle settlement theory but the flocculation theory.
Taking muddy coasts as example, during extreme weather days such as Typhoon, fine-grained cohesive sediment on the nearshore seabed can be re-suspended due to the fierce impact of wave and tide.
The medium grain size D50 of suspended sediments ranges from 0.002mm to 0.004mm based on historical field observations.
According to the relationship of sediment concentration and wave height indicated in Fig.3 and Fig.4, the corresponding wave height should be relatively larger, thus it can bring more energy to re-suspend the fine-grained cohesive siltation on seabed; (3) For the high rank of navigation channel such as 300,000DWT, the critical sediment concentration for fluid mud formation reduces to the range of 0.69-1.26kg/m3, and it is smaller due to the large water depth.
The forming process of fluid mud can be described as follows: in salinity water, fine-grained cohesive sediment settlement is described no longer effectively by the single particle settlement theory but the flocculation theory.
Taking muddy coasts as example, during extreme weather days such as Typhoon, fine-grained cohesive sediment on the nearshore seabed can be re-suspended due to the fierce impact of wave and tide.
The medium grain size D50 of suspended sediments ranges from 0.002mm to 0.004mm based on historical field observations.
According to the relationship of sediment concentration and wave height indicated in Fig.3 and Fig.4, the corresponding wave height should be relatively larger, thus it can bring more energy to re-suspend the fine-grained cohesive siltation on seabed; (3) For the high rank of navigation channel such as 300,000DWT, the critical sediment concentration for fluid mud formation reduces to the range of 0.69-1.26kg/m3, and it is smaller due to the large water depth.
Online since: January 2014
Authors: Xin Tan, Wei Guo Wu, Zhong Ming Wang, Xin Tan, Hai Ying Liu
The tailings in some mines usually contain a large number of valuable elements which can be comprehensively recovered [1-2].
Part of chalcopyrite is immersed in gangues as micro-grained particles, which is difficult to liberate even if fine grinding, so both the recovery and the concentrate grade of copper will be affected.
It is filled with the gangue minerals in the fissures of part of broken pyrite, and a little amount of pyrite impregnates in gangues as micro-grained particles, and a little also disseminates in granular or irregular form of monomers.
Micro-grained magnetite can be seen to be immersed in the gangues, which is difficult to liberate from the gangues during grinding and would be partly lost in the tailings owing to its fine dissemination size and close combination with the gangues.
It is difficult to beneficiate the sulfur minerals as a result of high content of slimes, kaolinite etc. easy-to-slime minerals, and the micro-grained dissemination of part of the sulfur minerals (the occupation rate of pyrite in the fraction of less than 0.010mm reaches up to 11.41%).
Part of chalcopyrite is immersed in gangues as micro-grained particles, which is difficult to liberate even if fine grinding, so both the recovery and the concentrate grade of copper will be affected.
It is filled with the gangue minerals in the fissures of part of broken pyrite, and a little amount of pyrite impregnates in gangues as micro-grained particles, and a little also disseminates in granular or irregular form of monomers.
Micro-grained magnetite can be seen to be immersed in the gangues, which is difficult to liberate from the gangues during grinding and would be partly lost in the tailings owing to its fine dissemination size and close combination with the gangues.
It is difficult to beneficiate the sulfur minerals as a result of high content of slimes, kaolinite etc. easy-to-slime minerals, and the micro-grained dissemination of part of the sulfur minerals (the occupation rate of pyrite in the fraction of less than 0.010mm reaches up to 11.41%).
Online since: April 2018
Authors: Ľuboš Kaščák, Emil Spišák, Janka Majerníková, René Kubík
The risk of undesirable spot welds led to the increasing of number of welds by approximately 20 %, which is time, energy and cost consumption [5].
The most important is the distribution of hard martensite grains in ferrite matrix.
The islands of martensite are dispersed around ferrite grains (amount of 10 to 30%).
Base metal of welded sample consists of a fine-grained structure with the ferritic matrix and island of the martensite.
The area of weld metal consists of coarse-grained structure of martensite as a consequence of rapid heating and subsequent cooling during the resistance welding process.
The most important is the distribution of hard martensite grains in ferrite matrix.
The islands of martensite are dispersed around ferrite grains (amount of 10 to 30%).
Base metal of welded sample consists of a fine-grained structure with the ferritic matrix and island of the martensite.
The area of weld metal consists of coarse-grained structure of martensite as a consequence of rapid heating and subsequent cooling during the resistance welding process.
Online since: January 2010
Authors: Christof Sommitsch, Ernst Kozeschnik, Martin Stockinger, Rene Radis, Gerald A. Zickler
Important parameters such as volume fraction, mean radius and number density of
precipitates are experimentally determined and numerically simulated as a function of the heat
treatment parameters time and temperature.
Introduction The term superalloy is generally used for a large number of different alloys.
The precipitation of a suitable quantity and size of coarse δ precipitates is used for controlling grain growth [3,4], whereas the precipitation of a large amount of fine-dispersed coherent γ' precipitates provides a large quantity of strengthening by precipitation hardening [5,6].
In Eq. 1, 0 represents the total number of potential nucleation sites.
Introduction The term superalloy is generally used for a large number of different alloys.
The precipitation of a suitable quantity and size of coarse δ precipitates is used for controlling grain growth [3,4], whereas the precipitation of a large amount of fine-dispersed coherent γ' precipitates provides a large quantity of strengthening by precipitation hardening [5,6].
In Eq. 1, 0 represents the total number of potential nucleation sites.
Online since: February 2013
Authors: Liang Li, Jun Wang, Xing Ping Fan
The results are found: there are a few of Ti (C, N) presented in the carbonitriding reaction production with theoretical amount of carbon at 1400℃; the content of Ti (C, N) increases with temperature; the carbonitriding reaction tends to finish at 1500℃; the average size of Ti(C,N) particles are 7.8452μm and the maximum is 21μm above 1600℃; the content of N in the Ti (C, N) decrease with temperature below 1400℃ and that of N increase and the change of C content is opposite above 1400℃; To increase appropriately carbon amount can promoto the carbonitride reaction which is benefit for the formation and grow of the Ti (C, N); when the amount of carbon beyond the theoretical value, the maximum and average size of grains obtained is smaller.
It shows that the bigger Ti(C,N) grains can be obtained and the high temperature is very important for the carbonitride treatment of the deep reduced slag to obtain Ti (C, N).
There is almost no melting phase in the sample and the main reaction may be solid-solid or solid-gas and the reaction not complete and a large number of free carbon residue in the product combining with Ti (C, N) into solid solution and so the ratio of C/N increase with temperature below 1400˚C.
It shows that the bigger Ti(C,N) grains can be obtained and the high temperature is very important for the carbonitride treatment of the deep reduced slag to obtain Ti (C, N).
There is almost no melting phase in the sample and the main reaction may be solid-solid or solid-gas and the reaction not complete and a large number of free carbon residue in the product combining with Ti (C, N) into solid solution and so the ratio of C/N increase with temperature below 1400˚C.
Online since: December 2013
Authors: Hardev Singh Virk, K.A. Koparkar, Shreeniwas K. Omanwar
A number of new fluorescence peaks were observed for the first time to our knowledge.
Fig. 10 TL emission spectra of LiF: MCP phosphor prepared by RAP technique 4.3.6 Grain Size Effect.
LiF: MCP powder of different grain sizes were obtained by using different mesh size of sieves.
Grain size effect on the TL of LiF: MCP phosphor is shown in Fig. 11.
Fig. 11 Grain size effect on the TL of LiF: MCP phosphor. 4.3.7 Effect of Annealing Procedure.
Fig. 10 TL emission spectra of LiF: MCP phosphor prepared by RAP technique 4.3.6 Grain Size Effect.
LiF: MCP powder of different grain sizes were obtained by using different mesh size of sieves.
Grain size effect on the TL of LiF: MCP phosphor is shown in Fig. 11.
Fig. 11 Grain size effect on the TL of LiF: MCP phosphor. 4.3.7 Effect of Annealing Procedure.
Online since: March 2020
Authors: S.J. Vijay, P. Ramkumar, S. Mohanasundaram, K. John Joshua
Experimental results showed that the Vickers microhardness number have been increased to 66 by addition of 15% ZnO, which was double that of the matrix material.
Vickers microhardness number Composite (wt %) Hardness (VHN) AA7068 33 AA7068 + 5% ZnO 44 AA7068 + 10% ZnO 50 AA7068 + 15 % ZnO 66 Table 1 demonstrates the Vickers microhardness number of AA7068/ZnO composites.
The increased wear resistance and reduced volume loss can be attributed to the addition of hard ceramic particles, homogeneous distribution, grain size and sintering parameters [6].
Few large number of deep and shallow narrow plastic grooves were present paralleling to the sliding direction which is due to intensive material removal which is the characteristic of abrasive wear [5,12,17].
Vickers microhardness number Composite (wt %) Hardness (VHN) AA7068 33 AA7068 + 5% ZnO 44 AA7068 + 10% ZnO 50 AA7068 + 15 % ZnO 66 Table 1 demonstrates the Vickers microhardness number of AA7068/ZnO composites.
The increased wear resistance and reduced volume loss can be attributed to the addition of hard ceramic particles, homogeneous distribution, grain size and sintering parameters [6].
Few large number of deep and shallow narrow plastic grooves were present paralleling to the sliding direction which is due to intensive material removal which is the characteristic of abrasive wear [5,12,17].
Online since: September 2013
Authors: Shao Lin Qiu, Lai Bin Zhang, Yuan Qiang Huang, Ya Ming Mao
In essence, the requirements of business differentiation will eventually be mapped to more fine-grained division and combination of underlying IT resources.
Obviously, HSE 1.0 architecture does not present such a fine-grained resource management capabilities.
Customization Layer could construct a cluster of VM instances based on resource requirements (eg: CPU number, memory size, software type, etc).
The overlapping of communities makes a more fine-grained resource sharing possible.
Given the number of simultaneous software instances with a license normally limited, negotiant allows that user with high priority will get license first when license requests from enterprises conflict.
Obviously, HSE 1.0 architecture does not present such a fine-grained resource management capabilities.
Customization Layer could construct a cluster of VM instances based on resource requirements (eg: CPU number, memory size, software type, etc).
The overlapping of communities makes a more fine-grained resource sharing possible.
Given the number of simultaneous software instances with a license normally limited, negotiant allows that user with high priority will get license first when license requests from enterprises conflict.