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Online since: November 2012
Authors: Ching Hwa Ho, Yung Kang Kuo, Ching Cherng Wu, Horng Jyh Gau, Yih Jye Chiou
.% in each ampoule and no grain boundaries and defects were found under the metallographic-microscope and SEM observations.
A number of diffraction peaks are observed in the 2θ angular range between 20° to 80°.
The electronic thermal conductivity (κe) of metal-like Pb1-xCdxSe crystals (x= 0, 0.01, 0.03, 0.05, 0.07) can be evaluated using the Wiedemann-Franz law κe=LoT/ρ as shown in Fig. 6, where Lo is the Lorentz number, ρ is the electrical resistivity, and T is the absolute temperature.
Online since: May 2012
Authors: Jia Bin Liang, Zheng Jun Wang
Mineral admixtures Application of fly ash Fly ash is collected by boiler flue gas of burning coal in the fine powder, and its grain is spherical shape and smooth surface.
Along with the development of agricultural production, it has a large number of surplus straws [16].At present, most crops straw has become a waste, take up a lot of farmland, or burning in situ, not only wastes a lot of resources, but also seriously pollutes the atmosphere environment.
Acknowledgements The author would like to supports of Education Department of Heilongjiang province (No.12521409, 2012, serial number is 421).
Online since: January 2014
Authors: Carlos Maurício Fontes Vieira, Monica Castoldi Borlini Gadioli, Mariane Costalonga de Aguiar, Michelle Pereira Babisk, Wagner Souza Ribeiro, Veronica Scarpini Candido, Sergio Neves Monteiro
As a raw material, the quartzite is geologically classified as a metamorphic rock composed almost entirely of quartz ( SiO2 allotropic form ) grains.
Correia and N.F.Castro: Advantage technology for quartzite minning document - RRT-0001-00-12 – Final technical report to the Brazilian agencies FINEP/SEBRAE – PB, General Corporation Agreement, FINEP cod number 1.0.05.0048.00, ATECEL/CETEM/INSA number 042/2008.
Online since: August 2013
Authors: Yao Qi Yang, Xin Jing Wang, Yang Gao, Pei Jun Wang, Hui Jun Ren, Ting Ting Wei, Wu Xiao, Yang Yu
Geological disasters caused by coal mining Coal mining subsidence induce the large number of landslides, slope instability, debris flows and other natural disasters.
The mode above, with the characteristic of low-cost reclamation, short payback period and significant economic benefits, is applicable to the coal mining subsidence area with ponding generated by collapse which takes full advantage of the water resources from the mining subsidence. 2) As the same time, we can the ecological environment quality in the area of mining can be improved through planning ecological garden, constructing mining museum and matched recreational facilities, and developing eco-cultural tourism in the subsidence area with large water surface, deep water body, and excellent water quality. 3.2 The agriculture, forestry, animal husbandry and fishery mode. 1)The mode that backfilling or grouting complex soil in subsidence area with gangue can change original subsidence area to agricultural land and effectively replenish the arable land is widely used in the area with a large number of coal gangue , river sediment surrounding.
This mode not only contributes to grain production, but also effectively reduces the compensation pressure and deal with the plight of the coal gangue and fly ash.
Online since: December 2012
Authors: Chang Feng Qu, Guo Wen Song, Chun Yan Wu, Lan Bing Xu
Traditional fit is defined as five factors: line, grain, ease, set and balance [11].
Clothing comfort is influenced by a number of factors, such as thermal aspects, ease of movement, fit, pressure of the body, tactility and propensity to generate static electricity [16].
It needs a large number of measurement, experiences and tests.
Online since: February 2013
Authors: Pavel Koštial, P. Škubala, D. Bražina, V. Szarková, Milena Kušnerová, Marta Harničárová, B. Haluzíková, R. Tomkowski, W. Kapłonek, Krzysztof Rokosz, Jan Valíček
A number of scientific papers devoted to the issue of plastic electrodes and to the effects of blasting on the final quality of plastic electrodes over a period of 20 years is shown graphically in Figure 1.
The graph shows that the total number of papers dealing with the given topic is as follows: 78% deal with the plastic electrodes after blasting and 22% deal with identification of the surface quality of plastic electrodes after blasting.
Brown corundum F30 Maxi-Clean MC2 Black silicon carbide F22 Toughness [Mohs] 9 4 9.5 Density [kg/dm3] 1.7 0.85 1.41 Grain size [mm] 0.42-0.85 0.58-0.84 0.72-0.93 Results and discussion The plastic samples (electrodes) produced by multicomponent injection were measured by a contact profilometer Mitotuyo Surftest SJ 401 (Fig. 4a).
Online since: December 2012
Authors: Wei Jiang, Lin Huan Zhang, Bo Yan, An Xi Jiang
Fig. 1 Preparation process of sludge activated carbon Activation of Sludge Activated Carbon Preparation Process The purpose of activation is to make the specific surface area of adsorbent further increased and form a large number of pore structure, finally turn it into activated carbon which has large adsorption capacity and a large number of fine pore structure.
Ce doped could inhibit grain growth in TiO2.
Online since: June 2012
Authors: Tsugunori Kanada, Masato Enokizono, Yukihito Kido, Akifumi Kutsukake, Tetsu Ikeda
The difference is caused by the impedance difference, such as a number of turns and stray capacitance between windings.
In relation to this, it is reported that when a number of H coil winding decreases the twist of BH loop disappears [10].
Tegopolos : Comparison of Iron losses in Multiple Grain Size Iron Laminations under Sinusoidal and SPWM Excitation , Applied Electromagnetic Engineering , Vol. 670 , pp. 74-81 (2011) [5]S.
Online since: January 2014
Authors: Chang Zheng Sun, Xiao Ping Zhang, Qian Chen
In the experiment, the fiber volume content is 0.1%, by adding the early strength agent, retarder and fly ash and admixture, and cement sand ratio to make the cement matrix structure being close-grained, the early strength met the requirements.
Early strength mortar strength test results Serial number Cement sand ratio Fiber content (%) Cementitious materials Compressive strength (MPa) Flexural strength (MPa) Cement (%) Fly ash (%) 7d 28d 7d 28d 1 1 0 50 50 36.1 44.6 5.8 7.2 2 1 0.1 50 50 36.3 44.9 6.0 7.2 3 1 0.3 50 50 36.5 44.6 6.1 7.3 4 1 0.5 50 50 37.1 44.7 6.1 7.3 5 1 0.7 50 50 37.2 45.0 6.3 7.4 6 1 0.9 50 50 37.3 45.0 6.5 7.5 7 1 1.1 50 50 37.7 45.2 6.6 7.9 8 1 1.3 50 50 36.9 44.6 6.7 8.0 9 1 1.5 50 50 35.0 43.1 6.7 8.0 10 2 0 50 50 34.2 42.3 5.3 7.1 11 2 0.1 50 50 34.2 42.1 5.3 7.1 12 2 0.3 50 50 34.6 42.5 5.5 7.2 13 2 0.5 50 50 34.9 43.0 5.7 7.3 14 2 0.7 50 50 35.0 43.2 6.0 7.3 15 2 0.9 50 50 35.2 43.8 6.2 7.4 16 2 1.1 50 50 34.7 42.3 6.1 7.4 17 2 1.3 50 50 34.2 41.8 6.1 7.5 18 2 1.5 50 50 34.2 40.5 6.0 7.5 19 2.5 0 100 0 37.2 45.8 5.4 6.8 20 2.5 0.1 100 0 37.3 46.0 5.5 6.8 21 2.5 0.3 100 0 38.0 46.2 5.7 7.0 22 2.5 0.5 100 0 38.5 47.2 6.0 7.3 23 2.5 0.7 100 0 39.2 48.0 6.4 7.8 24 2.5 0.9 100 0 39.0 47.5 6.2 7.5 25 2.5
From the micro morphology of Figure 8, there were a small amount of Ca(OH)2 crystals, and a large number of hydrated calcium silicate gel flocculation.
Online since: October 2014
Authors: Andrzej Romanski, Janusz Konstanty, Dorota Tyrala
The Knoop hardness numbers and the proportion of (gFe) to (aFe) in the subsurface layer were evaluated during preparation of the metallographic specimens on surfaces ground on SiC #220 paper and again after final polishing with 1 mm diamond (Table 3).
Table 3 Densities, Knoop Hardness Numbers and Volume Percentages of Austenite (3) Material Milling time [hours] Density [g/cm3] KH0.5 V(gFe) (4) as-polished condition as-ground condition as-polished condition as-ground condition Fe-Ni-8 8 7.90 ± 0.09 258 ± 36 305 ± 50 83 12 Fe-Ni-120 120 7.62 ± 0.10 440 ± 18 442 ± 54 27 10 Fe-Mn-8 8 7.75 ± 0.01 298 ± 17 359 ± 35 73 63 Fe-Mn-120 120 7.61 ± 0.08 363 ± 31 391 ± 52 96 98 (3) scatter intervals estimated at 90% confidence level (4) estimated assuming that V(aFe) + V(gFe) = 100% (no account taken of other phases) Table 4 Bending Properties and Abrasion Resistance Indices of the Experimental Alloys (5) Material Milling time [hours] 3-point bending test Ai [mm/20m] TRS [MPa] OYS [MPa] epl [%] Fe-Ni-8 8 1161 ± 277 775 ± 178 2.0 ± 1.0 22.0 ± 3.1 Fe-Ni-120 120 584 ± 247 - 0.1 ± 0.1 39.1 ± 6.5 Fe-Mn-8 8 1325 ± 228 866 ± 41 2.2 ± 1.4 23.2 ± 4.3 Fe-Mn-120 120 1421 ± 65 1351 ± 155 0.8 ± 1.3 28.4 ± 5.4 Co-20%WC - - - - 33.6 ± 8.2 (5) scatter
The metallographic observations (Figs 3-5) reveal marked differences in grain size and microstructural inhomogeneity of the tested specimens.
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