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Online since: August 2013
Authors: Zheng Zhang, Wei Wang, Dao Wushuang Shi, Xing Quan Liu
Fig. 2 showed a plot of discharge capacity versus cycle number of the LiFePO4/C under the condition of different iron source ratios.
Fig. 1 Discharge capacity vs. cycle number of LiFePO4/C synthesized at different temperatures Fig. 2 Discharge capacity vs. cycle number of LiFePO4/C synthesized at different ratios of iron sources Fig. 3 The initial discharge profiles of samples synthesized at different iron source ratios 3.2 The influence of sintering temperatures on the morphology of LiFePO4/C composite cathode materials.
Under the condition of the same coated carbon amount, the composite cathode material synthesized at 710˚C has the uniform grain size and distribution.
And the composite cathode material synthesized at 710˚C has the uniform grain size.
Online since: October 2002
Authors: F.H. Froes
Stability of grain structure in a hot isostatically pressed gamma titanium aluminide.
A number of studies have led to the formation of nanometer sized metallic powders (Figure 13).
Comparison of Synthesis/Processing Techniques A number of synthesis/processing techniques have been briefly reviewed in the text above.
Comparison of the characteristics of a number of advanced processing/synthesis techniques.
Mukhopadhyay "Grain Growth Behavior of Nanograined Gamma TiAl Compacted by Hot Isostatic Pressing," ASM Int.
Online since: March 2007
Authors: Jilt Sietsma, Richard G. Thiessen, I.M. Richardson
Refinements to the CNT have isolated nucleation rates for the various types of nuclei, namely nuclei at grain corners, edges and faces.
The actual initial microstructure was constructed based on measured grain sizes and phase fractions from the asreceived material.
Values for N j n were estimated by the total number of potential corner, edge and face nucleation sites.
Here, for ease of implementation, the total number of potential face sites was estimated as ten times the number of edge sites.
By 1373 K, both microstructures have completely austenitised, but grain coarsening has progressed further in the simulation of heating at 10 K s -1.
Online since: July 2017
Authors: Jiang Min Xu, Chuan Lin Hu
The structural [8] states of these areas and the grain sizes were different.
The size of the grains in the welding zone was double that the welding zone in the heat-affected zone.
These included a large amount of polygonal ferrites and proeutectoid ferrites in the grain boundary and acicular ferrites in the crystal growth.
Between the ferrite bars, ferrite grains and carbide particles were coarse, and they had an obvious directional distribution.
The distribution of the hardness numbers of the weld joint and the heat-affected zone is shown in Fig. 4.
Online since: December 2010
Authors: Yu Feng Zheng, Yan Bo Wang, Shi Cheng Wei, Fei Long Nie, Sheng Gang Wang
Introduction Conventional polycrystalline SUS 304 stainless steel (generally with the grain size at micrometer scale) is one type of austenite steel that has face-centered cubic (FCC) lattice structure without magnetism.
Different fields were randomly counted and values were expressed as the average number of adhered platelets per mm2 of surface.
Results and discussion The phase structures and grain size of the nanocrystalline 304ss had been reported in our previous work [19-21], in which the grain size of the experimental sample was found to be remarkably reduced from micro-scale (about 100 μm) to nano-scale(about 50 nm) by the XRD patterns, Scherrer calculation and TEM.
This may be explained by the reason that pitting corrosion are more susceptible to occur and propagate at the areas of macroscopic defects and around grain boundaries, then nanocrystalline 304ss with ultrafine grains, resulting from the severe plastic deformation, would suffer more severe pit corrosion.
Fig. 6 Haemocompatibility evaluation of a) hemolysis rate and b) the number of platelet adhesion (SEM images as inset) of microcrystalline 304ss and nanocrystalline 304ss References [1] J.A.
Online since: October 2012
Authors: Tian Bao Li, Bing Li, Yu Long Ye, Zhao Yang
Fig. 2(c) illustrates the typical thixotropic grain structure after thixoforged at 868 K.
It can be observed that after secondary remelted, roundness of the microstructures significantly improved, most of the primary grains are equiaxed and the size of primary grain is about 50-200 μm, and these microstructures are suitable to thixo-forging.
The number of the cracks formed during forging decreased dramatically, and the eutectic silicon of needle shape morphology becoming spotted shape.
There is a considerable number of the flat primary silicon and some black voids dispersed on the fracture surface.
In some case, however, the crack may take an intergranular (along the grain boundaries) path, particularly when segregation (preferential separation of different elements) or inclusions weaken the grain boundaries [20].
Online since: January 2015
Authors: Hong Sheng Hu, Bo Yuan Cui, Qun Feng Niu
Freshness is an important indicator of food quality, accurate detection of freshness of corn is not only related to the interests of the food business, but also provide scientific and reasonable basis for the state grain reserve depot to determine what time to get the grain out of depot[1].
With the increase of grain storage time, its activity is gradually weakened as well as the intensity of ultra-weak photon emission, the quality of foodstuff activity can be detected according to this characteristics.
Rotating sample stage has four evenly distributed test sample chamber and the samples are numbered 1 to 4, the rotation axis is positioned outside of the dark box where there is a mark in the test sample to indicate the current number.
Grain and Oil Storage Technology Newsletter, 1(2009)48-49
Grain and Oil Storage Technology Newsletter, 6(2003)49-50
Online since: February 2014
Authors: Thomas Holden, Donald W. Brown, Bjørn Clausen, Thomas Sisneros, Michael Glavicic
The microstructure of the δ-phase takes the form of plates or globules decorating the grain boundaries [3, 4].
These numbers, provided by Rolls-Royce, are required to calculate the scattering lengths in the two phases and hence their relative concentrations as well as the alloy structure factors.
Fig.2 Individual grain families of the γ-matrix at 20ºC parallel and perpendicular to the loading axis.
Grains with á002ñ directions along the load develop tensile intergranular strains while á111ñ and á113ñ directions, near the [] vertex, remain linear.
The earlier onset of plasticity at 400ºC leads to a significant increase in load carried by the δ-phase grains.
Online since: August 2022
Authors: Muhammad Anis-ur-Rehman, Haris Farooq Kiani
First reason is the activated oxygen vacancies, a large number of charge carriers, and temperature dependent diffusion are all factors that contribute to this effect.
A material with a high grain alignment has a high density, and its acts as a charge carrier transportation highway.
Carrier mobility can be influenced by grain defects, grain size and grain boundaries [13].
Estemirova, Grain growth kinetics, microstructure and magnetic properties of mechanically activated Nd1− xCaxMnO3±δ manganites, J.
Yang, Significant Enhancement in Thermoelectric Properties of half-Heusler Compound TiNiSn by Grain Boundary Engineering, J.
Online since: June 2010
Authors: Jun Zhao, Xing Ai, Yong Hui Zhou
The starting materials were α-Al2O3 powders with average grain size of approximately 0.5 µm, purity 99.99% (Zibo Dongchangye Alumina Co., Ltd.
China), α-Al2O3 nanoparticles with average grain size of approximately 100 nm, purity 99.9% (Shanghai TeamShare Nanotechnology Co., Ltd.
China) and (W, Ti)C solid solution microparticles with average grain size of 1 µm, purity 99.2% (Zhuzhou Cemented Carbide Group Co., Ltd.
A minimum number of five specimens were tested for each condition.
Whereas the fractured surface of SG-4 tool was characterized by a typical intergranular fracture with a large amount of voids left by grain pull-out (Fig. 5b).
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