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Online since: June 2019
Authors: Michaela Sommer, Frank Mumme, Gregor Fornalczyk
Among the large number of ceramics, doped zirconia is a suitable candidate for good thermal barrier properties due to its low thermal conductivity [5-8].
Ceramic coatings developed for tool applications and produced by metal-organic chemical vapor deposition (MOCVD) are used to be subsequently laser-treated with a technical grain or texture.
Online since: October 2011
Authors: Yang Wang, Chun Yuan, Mei Chen Fu, Jian Jun Zhang
According to the degree of influence for each factor to the original variables, dividing it into a class equivalent to the number of factors, thereby reducing the variable dimensions.
It’s one of the major grain production and forest areas.
Online since: July 2011
Authors: Shang Lei Yang, Qing Lin Lin, Feng Guang Hu
The results are that emerge a large number of cracks, which seriously affects the fog effects of water-coal slurry and gas-generating capacity of gasification furnace.
The characteristics of the laser cladding make the cladding layer melt and solidify rapidly, which produces fine grain strengthening effect in composite cladding layers, as well as Cr, W, Mo, Ni and Co and other alloy elements generate solution strengthening effect on the matrix, together with the dispersion strengthening and purification of fine eutectic carbides and yttrium oxide Nano-particles, all of that makes the surface hardness of laser cladding layers is higher than the original surfacing layers.
Online since: October 2013
Authors: Xiao Yan Sun, Hai Long Wang, Yue Jing Luo, Guang Yu Peng
However, large numbers of tests and engineering practice show that the cracking of concrete structure is almost inevitable, which will decrease the durability and safety of concrete structures.
The find sand used here had a maximum grain size of 120 μm and an average size of 150μm.
Online since: July 2016
Authors: Feng Hua Li, Han Gao, Bo Wen Zhang, Qing Lian Zhu
The superconductivity of MgB2 is not sensitive to weak links, such as grain boundaries, which enables some techniques to be applied on the processing of MgB2 materials.
Transference number of charge-transfer complexes in solutions: methanol-iodine and ethanol-iodine, Proc.
Online since: June 2008
Authors: Wen Cheng J. Wei
One concern is the mean free path (mfp) of the molecules relatively to gap size (S) with the following relationship. 12 )2( − = nd mfp π (1) Where n is the number of molecules per unit volume, equals to p/kT, d is diameter of gas molecule (1.5x10-10 m), k is Boltzman constant (1.38x10 -23 J/atom-K).
Fig. 2 (a) SEM micrograph of 8 mol% Y-doped ZrO2 plate sintered at 1500 o C for 1 h and (b) the sintered density and grain size of the samples as a function of sintering temperature.
Online since: July 2008
Authors: Ahmed Rassili, Bernd-Arno Behrens, Dirk Fischer
For thixoforming it is mandatory to reach the process temperature as quickly as possible in order to avoid unwanted grain coarsening and to keep the risk of scaling minimal.
Finally the control variable has to be represented by a crisp number.
Online since: January 2005
Authors: Tatsuo Sato, Shoichi Hirosawa
On the contrary, a number of small clusters containing Cu, Mg and Ag atoms are found in Fig. 7(c), (d).
This observation indicates that the microalloying element of Ag accelerates the nucleation of the precipitates near grain boundaries.
Online since: March 2015
Authors: Hong Wei Wang, Ke You Ma
Table 1 Effects of rare earth dosage on optical properties of the samples Serial numbers of samples x(RE)/% Powder colors Afterglow colors λEX/nm λEM/nm Eu2+ Dy3+ L -1 2 3 Light yellowish green yellowish green 364 510 L -2 3 3 yellowish green yellowish green 365 503 L -3 4 5 yellowish green yellowish green 364 505 L -4 6 8 yellowish green yellowish green 368 512 From table 1, it can be seen that the rare earth dosage affects not obviously to the afterglow colors of phosphorescence materials.
When the temperature rising to 1400˚C, the sintered powder colors are non-uniform, the surface colors of samples are mainly yellowish green and some red grains disperse among them, the luminescent intensity observed by eyes is stronger, but the extra sintering often occurs resulting in the samples being taken difficultly because of bonding on the pot and it is difficult for the powder to grind on because of its great rigidity so that its luminescent intensity decreases obviously.
Online since: January 2012
Authors: Shu Ling Cui, Jun Ping Zhu, Bao Mei Li, Shao Peng Wang, Ying Liu
Table 1 Crystallinity and crystalline grain size of Jade fiber and polyester fibersand crystallite dimension of Jade fiber and polyester fiber Sample Name Crystallinity /% d / A Polyester 40.87 3.9662 Jade fiber 18.64 4.5127 2.3 Moisture absorption of the jade fiber TThe natural moisture regains of the jade fiber and polyester fiber are shown in Table 2.
Table 2 Natural Regain of jade fiber and polyester fiber (25 °C, R.H.40%) Sample number Jade fiber G 0 / g W∕% Polyester G 0 / g W∕% 1 49.72 0.5632 35.69 0.4011 2 49.73 0.5429 35.62 0.4038 3 49.74 0.5227 35.45 0.4103 Table 2 shows that under the condition of temperature 25 °C, relative humidity 40%, the average natural moisture regain of the jade fiber was 0.5429% while that of polyester fiber was 0.4051%.
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