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Online since: January 2016
Authors: Chanchana Thanachayanont, Anek Charoenphakdee, Tosawat Seetawan, Kunchit Singsoog
The diffraction peaks were indexed by comparing with ICDD PDF card number 00–021–0139 and consistent as well.
Figure 1 (b) shown diffraction peaks of SLTO with ICDD PDF card number 00–035–0734.
The SEM image of CCO show invariably grains boundaries connection and affects to low electrical resistivity.
The average grain size of the sintered sample was found to be 4.05 µm and 5.50 µm for CCO and SLTO, respectively.
We can be generated power depend on temperature difference and number of couple pairs.
Online since: March 2014
Authors: Dietmar Eifler, Marek Smaga, Andreas Sorich
The initial microstructure (Fig. 1) of the investigated steel has a mean grain size of 120 µm and a HV10 hardness of 140 HV.
After a load dependent number of cycles N, the formation of a´martensite starts and increases continuously with increasing number of cycles until specimen failure (Fig. 2a).
Figure 3d at N = 1193 which corresponds to 0.9Nf shows well defined dislocation cells and dislocation pile-ups along grain boundaries.
Development of stress amplitude σa and change in mean value of tof ∆tofmean versus the number of cycles N at εa,t = 1 %, 300 °C and f = 0.01 Hz (a).
At total strain amplitudes εa,t ≤ 0.15 % fatigue life increases to a significant higher number of cycles to failure.
Online since: June 2015
Authors: Walter Charles Primus, Jumiah Hassan, Abdul H. Shaari, Siti Hashimah Mohd Hanif
In electrical measurement, the frequency dependence of complex capacitance plot shows the sample have strong dispersion at lower frequency and the impedance plane plot shows a semicircle due to the grain effect.
The number of fc shows that the higher the temperature the higher its frequency intercept.
It is clear that the impedance response show only one semicircle which might be due to the grain effect.
Online since: March 2007
Authors: Z.H. Sun, Hao Li Zhang, C.L. Xu
Pattern in Fig. 1A consists of large number of dots and pits.
Fig. 2a shows typical SEM images of the AAO, in the area close to the boundaries of three grains.
They are clearly associated to the crystal grains within the aluminum due to annealing.
The stripe patterns show clear domain structures which is attributed to the crystalline grains due to the annealing to the substrate.
Online since: September 2011
Authors: Qiu Ling Chen, Qin Li, Ke Wei Sun
Experiment 1.1 Reagent and Instruments of Experiment Experiment material: cement, soil stabilizer of Shuoji brand, architectural sediment with 4.75mm grain diameter below, soil below the ground 20cm in Kunming University of Science & Technology, tap water of Kunming city.
These samples were number ed as 0#,1#, 2#,3#,4#,5#, then they were made indoor standard heavy compaction test, and then based on the result, the maximum dry density of the samples determined the best water content and added water needed by stabilized soil of different mixing proportion.
Unlike the 2#~5# samples contained with supportive coarse-grained aggregates, its strength is not higher at the whole age.
Its strength partly depend on the clay hydrated by cement, and partly depended on the anticular ettringites, which is produced most at the case, and there are enough coarse-grained aggregates in the 70% building wastes with sound supportive effects[7].
Online since: December 2013
Authors: Yu Qiang Wang
(2) Soil organic matter: soil organic matter is the plant mineral nutrients and organic source of nutrition, it is energy substances in soil heterotrophic microorganisms, is also an important factor in the formation of soil structure, the number of determination of the content of soil organic matter,say in a certain extent of soil fertility in Ming dynasty.
In the test group, the mechanical composition of soilthickness difference, coarse grain large proportion, thus affecting the soil moisture characteristics.
The soilporosity and high permeability, strong ability in system, rainfall intensity,runoff coefficient is relatively small, can slow down the slope runoff erosion,otherwise will produce larger slope erosion; content of water stable aggregates slope high, can provide the ability to resist the erosion of runoff, the runoff scouring is handling capacity and surface material grain size grade bond between the two results, surface material composition of large grain size, cementation strength to resist the slope runoff erosion,conversely, will result in larger slope soil erosion.
Online since: June 2014
Authors: Adriana Scoton Antonio Chinelatto, Adilson Luiz Chinelatto, Guilherme Gralik
The mechanical strength of a porcelain is the result of several factors such as: number and size of mullite needles, size and shape of the particles of quartz and / or dispersed alumina, different expansion coefficient of vitreous and crystalline phases and mechanical property characteristic of the glassy phase [8, 9].
One can observe the presence of the primary phase mullite, mullite secondary, agglomerates of alumina and quartz grains.
For all compositions studied, it was found that the partial replacement promoted a greater increase in strength than the total replacement, indicating that the presence of quartz grains was also effective in increasing the mechanical strength of these porcelains.
All compositions showed the main phases of a triaxial porcelain: alumina, mullite, quartz grains and glassy phase.
Online since: May 2007
Authors: U.Sangwanna Sanewirush, M. Buaheepkaew, O. Kosasang, P. Saewong
A microstructural comparison of Fig. 5(a), (b) and (c) shows that M-WS1 has finer grains than M-WS2 and M-WS3.
Impurities, especially CaO and Fe2O3, in Al2O3-SiO2 mixtures increase the growth rate of mullite grains [4].
It may be affected by large number of pores which retard crack propagation as suggested by [5, 6].
The impurities in the precursors play an important role to promote the densification and grain growth of mullite specimens fired at 1400 °C.
Online since: August 2012
Authors: Janusz Adamiec, Maciej Różański
As there is a number of difficulties related to the welding of titanium and its commercial alloys, the brazing of the former appears to be a highly promising joining method.
Structures of brazed joints of titanium grade 2 The test pieces for microscopic metallographic examination were subjected to grinding with abrasive paper of gradation of 80, 320, 1000 and 2500 respectively and next to polishing by means of polishing cloth with an addition of diamond and corundum polishing slurries of grain sizes of 3 and 0.05 mm respectively.
In addition to that, in case of the joints brazed for 40 minutes it was possible to observe a coarse-grained structure with acicular precipitates inside grains and an easily visible boundary of crystallisation fronts (Fig. 2 d).
Online since: October 2010
Authors: Wei Lin Zhao, Zhen Lin Wang, Hui Huang
These samples were numbered as listed in Table 1.
It is found from Fig.1 that, although the coating surfaces of all the samples exhibit cauliflower top, the coating surface of the 1# sample with the maximum roughness is loose, porous and uneven-grained.
The 2# sample with the minimum roughness has a cluster-like coating with uniform fine grains poorly dispersed.
As shown in Fig.1, the higher surface roughness of the substrate causes the coating to be loosened, porous and unevenly distributed with brush-plated grains.
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