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Online since: July 2004
Authors: Fernando Audebert, F. Saporiti, S. Gabbanelli
The nanostructured Al-based alloys composed by α-Al nano-grains embedded in an amorphous matrix show higher thermal stability and mechanical strength at room temperature than the fully amorphous alloys, moreover have three times greater mechanical strength than conventional Al alloys [2].
Therefore each pair of atoms (A-B) can be described, according its environment, by a sequence of four integer numbers.
The second number represents the quantity of shared neighbours (near-neighbours bonded with both A and B atoms).
These three numbers are not sufficient for characterising a topology, so a fourth number is added arbitrary but consistently for providing an unique correspondence between numbers and topologies [13].
As a normal behaviour it was observed that the total number of clusters increases as the temperature decreases.
Online since: October 2013
Authors: A.S. Vereschaka, Vladimir P. Tabakov
As far as the defectiveness of a coating is concerned, temperatures can influence the following mechanisms of coating formation [4]: use of residual gas atoms; vacancy hardening; decreasing the grain size of substructure condensate and increasing dislocation density.
The chemical composition of the coatings is determined by the design of the vacuum-arc installation, namely on the number of evaporating cathodes, on their location relative to one another, on the distance between evaporating cathodes and the cutting tool.
Using as an intermediate layer the TiМоN coating (TiCN-TiМоN-TiN coating), which has lower fracture resistance than the TiZrN coating, reduces the number of a tool’s working cycles N2C, N3,4C and N5C.
The said reduction of the number of working cycles N2C, N3,4C and N5C results in an increase of the overall thickness of a coating (Table 4).
The thus formed multilayer coating TiCN15%-TiZrN-TiNCTM provides an increase in the number of a tool’s working cycles N2C, N3,4C and N5C in comparison with the corresponding figure for a tool with the TiCN-TiZrN-TiN coating.
Online since: November 2016
Authors: Rustam Kaibyshev, Alla Kipelova, Andrey Belyakov, Evgeniy Tkachev, Marina Odnobokova
A number of Nb-rich M(C,N) carbonitrides with a mean size of 20 nm precipitated on dislocations during low temperature tempering.
TMLS consists of prior austenite grains (PAG), packets, blocks and dislocation laths [1, 11] with thickness of about 200 nm.
Online since: October 2015
Authors: Zbyšek Pavlík, Milena Pavlíková, Jaromír Žumár, Jaroslav Pokorný, Anton Trník
However, in some cases, there is necessary to realize interior thermal insulation systems, what brings number of possible problems.
Due to the supercritical evaporation technology has material excellent thermal insulation performance (its porosity normally exceeds 90%) because of its nano-porous structure with an average diameter in the range from 20 to 40 nm, and very small solid grain size approximately 2 – 5 nm [2].
Online since: May 2014
Authors: Cheng Qing Guo, Jun Feng Xu
Area index refers to the numbers of FPGA logic resources taken up by the design, which is commonly measured by the logical unit number taken up by each pattern (LEs/char), equaling to the logical unit number of the entire system divided by the sum of the length of all patterns, in which each logical unit includes a lookup table (LUT), a flip-flop (FF) and related associated logic.
They pointed out the number of basic unit circuit required by N-status of NFA directly achieved in the integrated circuit is no more than O (N).
Since the number of States and the transfer edge take up a large amount of logic and wiring resources, so far the DFA implementations are usually based on FPGA-based Block RAM and SRAM[12].
The rational use of the default transfer can greatly reduce the number of transfer edges required for each state.
In order to evaluate the experimental results in a more fine-grained perspective, the 102 rules have been classified into two categories: simple (including 62 rules) and complex set of rules (including 40 rules).
Online since: July 2011
Authors: Jing Hai Zhou, Chao Bi Zhang, Xian Hong Meng
Experiment Design Experiment Materials and Wall Parameter The experiment uses the C20 concrete that the laboratory abandoned, after man-power broken processing, selected the grain diameter to take the coarse aggregate in the 5~30mm continuous grading, and uses to it stone enveloped with cement processing[7], then maintains for 28 days under the nature conditions, the processed coarse aggregates and the natural coarse aggregates take this experimental according to 1:1 proportion mix the coarse aggregates.
The test sample serial numbers respectively were RCSW1, RCSW2, and the parameters were indicated in figure 1.
Online since: October 2011
Authors: Qiong Li, Chun Ming Hao, Hui Lin Liu
As social and economic development, urbanization into accelerated, aggravating of agricultural activities, industrial "three wastes” and the large number of vehicle exhaust emissions, excessively use of pesticides and fertilizers containing heavy metals, environmental pollution problems had become worse, heavy metal pollution was paying more and more attention [1].
Pinghu located in Golden Yangtze River Delta region, and was an important grain-producing county in Zhejiang Province.
Online since: August 2012
Authors: Yao Ning Sun, Chen Guang Zhu, Wen Lei Sun, Xu Dong Zhang
Time step can be roughly estimated that the initial time step approach using the Biot and Fourier number to determine.
When the laser power is 1.6KW, the cladding layer of surface temperature is 3,165℃the temperature of substrate and cladding layers is too high, dilution rate increased significantly in the middle of cladding layer, substrate melt too much, Grain boundaries exist melting characteristics, combined with some cracks, indicating that in this parameter was injected into the molten pool of laser energy density is too large.
Online since: November 2012
Authors: Sarika Sharma, Pooja Agarwala, Rajnish Garg, P. Gopinath, Sulaxna Sharma
Several grains form a globule and the EL coating consists of globular structure.
The presence of metal oxide particles in Ni-P layer affects the homogeneity of the surface and increases the number of boundaries between Ni and other globules in the matrix [9].
Online since: February 2011
Authors: Hui Jin Song, Qiang Yan
A number of factors could account for the results, including residual stresses, texture and grain growth (size and density) [7], as presented in the XRD, SEM characteristics.
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