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Online since: December 2010
Authors: Chun Gui Du
Sliced bamboo veneer maintained the specific grain and texture of bamboo, and its properties closed the precious hardwood veneer, and it is one kind of new high-end decorative material[1-3].
It is wood material that the wood board or small wood block are glued in length, width or thickness direction in accordance with the parallel grain direction assembling.
Table 2 Experimental arrangement and test results serial number unit pressure /MPa hot pressing temperature / hot pressing time /min moisture content /% surface bond strength /MPa immersion-peel situation 1 0.5 90 2 11.8 0.65 no 2 0.5 100 4 10.9 0.94 no 3 0.5 110 6 9.7 0.72 no 4 0.7 90 4 11.0 0.83 no 5 0.7 100 6 10.5 1.01 no 6 0.7 110 2 11.1 0.78 no 7 0.9 90 6 11.5 0.76 no 8 0.9 100 2 11.2 0.87 no 9 0.9 110 4 10.3 0.96 no Table 3 Range analysis properties level unit pressure /MPa hot pressing temperature /℃ hot pressing time /min surface bond strength 1 0.77 0.75 0.77 2 0.87 0.94 0.91 3 0.86 0.82 0.83 range 0.10 0.19 0.14 Fig.1 The influence of hot pressing technology to surface bond strength The influence of non-woven fabric to properties of composite panel.
Table 4 The influence of non-woven fabric to properties of composite panel serial number surface bond strength /MPa immersion-peel situation not back lining non-woven fabric back lining non-woven fabric not back lining non-woven fabric back lining non-woven fabric 1 0.83 0.71 no no 2 0.95 0.92 no no 3 1.07 0.76 no no 4 0.90 0.88 no no 5 1.11 0.79 no no 6 0.86 0.85 no no average value 0.95 0.82 Conclusions (1)The technology of sliced bamboo veneer were glued on both the top and bottom surface of Chinese fir glulam is feasible.
Online since: June 2014
Authors: Odd Sture Hopperstad, Mikhail Khadyko, Stéphane Dumoulin
The critical resolved shear stress on slip system is found as (1) where is a dimensionless coefficient, is the shear modulus, is the length of the Burgers vector, is the interaction matrix for stress, is the dislocation density on slip system and is the total number of slip systems.
This type of heat treatment has been chosen because precipitate particles do not form, so that the geometrically necessary dislocations are not generated around these particles in any significant numbers and Equation should be sufficient to describe the dislocation density evolution.
To this end, the polycrystal was modelled with a 1000-grain representative volume element (RVE) with elements mesh using periodic boundary conditions and stress-strain curves in the extrusion direction for this setup were obtained.
In the RVE the stress distribution in the grains and stress values vary strongly between different models.
Online since: August 2018
Authors: Manoj Gupta, Sravya Tekumalla
Capability of Magnesium Nanocomposites to Holistically Improve Properties Magnesium reinforced with particles at nanolength scale has shown tremendous potential in improving a combination of microstructural (grain refinement and texture changes) and mechanical properties.
Material (vol %) Grain Size x 10-6 m Aspect ratio x 10-6 m Microhardness (Hv) CTE (x10-6/ K) Ignition temperature (oC) Pure Mg 34 ± 2 1.6 ± 0.38 46 ± 3 25.28 581 ± 3 Mg/2SiO2 23 ± 1.5 (↓32.3%) 1.48 ± 0.22 69 ± 2 (↑50%) 23.31 611 ± 2 Similarly Table 4 and Figure 4 show the capability of nano-length scale reinforcement to enhance the high temperature stability and creep response of magnesium.
Figure 5 illustrates the use of CNT to enhance number of cycles to failure for a given applied stress and magnitude of stress for a given number of cycles to failure through the incorporation of CNT reinforcement [13].
Online since: June 2015
Authors: E.I. Get`man, K.A. Chebyshev, L.I. Ardanova, L.V. Pasechnik
As shown in figure 3, grain size of Gd1.6Cd0.4MoO5.8 is smaller than 0.5 μm.
Particles of Ho1.4Cd0.6MoO5.7 are bigger than Gd1.6Cd0.4MoO5.8 and consist of grains with size up to 1 μm.
Ln1 Gd Ho 0.0130(8) 0.0115(3) 0.25 0.25 12 12 Cd1 Gd Ho 0.0130(8) 0.0115(3) 0.25 0.25 0 Ln2 Gd Ho 0 0 0 5.0668 2.9332 8 Cd2 Gd Ho 0 0 0 2.9332 5.0668 Mo Gd Ho 0 0.75 0.25 10.6667 12 Cd3 Gd Ho 0 0.75 0.25 1.3333 O1 Gd Ho 0.108(4) 0.1210(19) 0.108(4) 0.1210(19) 0.108(4) 0.1210(19) 16 16 O2 Gd Ho 0.570(6) 0.5858 (19) 0.366(3) 0.3701(12) 0.852(4) 0.8315(18) 48 48 Lattice parameter of cubic phase for Ho1.4Cd0.6MoO5.7 is smaller than for Gd1.6Cd0.4MoO5.8 (Table. 3) because holmium ionic radius (1,015 Å for coordination number 8) is smaller than gadolinium one (1.053 Å [13]).
Decreasing number of bands indicates to symmetry rising due to cadmium substitution.
Online since: October 2018
Authors: Ulrich Krupp, Thomas Hipke, Srecko Nesic
It has been shown that the brittleness in tension can be attributed to microstructural defects of the cell strut material, such as pores, large grains and intermetallic inclusions.
Possible reasons for this kind of brittleness are given by Fig. 2b and c, showing typical microstructural defects of the cell strut/wall material in form of coarse eutectic Si particles, large intermetallic inclusions, and grain/dendrite arm sizes that reaches up to the cell strut diameter (Fig. 2c).
a b Fig. 4: Mechanical testing of Alporas metal foam: (a) Stress strain diagram with sequential unloading-loading hysteresis loops to determine the evolution of the Young's modulus (dashed line) during tensile deformation, and (b) stress-strain hysteresis loops for various numbers of cycles (fracture at Nf=81000 cycles).
Beside uniaxial fatigue testing, a large number of specimens was tested by means of rotating bending.
Online since: November 2011
Authors: Ying Feng Meng, Gao Li, Hua Zhou, Li Ping Wan
Because of high chemical stability and light corrosion resistance and a deeper valence band energy level of TiO2, so a number of endothermal chemical reaction can be conducted and accelerated in the TiO2 surface by light illumination.
The reasons for this phenomenon are as follow: after aerate air into the water sample, on the one hand, the air bubble can drive the catalyst grains to move in the solution, increased the effective collision probability between the catalyst grains and the organic matters in the wastewater; on the other hand, the dissolved oxygen in the water can react with the hot activity electron on the conduction band, finally produce the hydroxyl radical (·OH), at the same time it is in favor of decreasing recombination between the electron and the hole.
Analysis of Contrast Experiment experiment number COD removal rate(%)) experiment conditions 1 27.4 TiO2 catalyst+{TTP}-245 light+{TTP}-245 aeration 2 58.1 TiO2 compound catalyst+{TTP}-245 light+{TTP}-245 aeration 3 10.2 non-catalyst+{TTP}-245 light+{TTP}-245 aeration 4 8.9 non-catalyst+{TTP}-245 non-light+{TTP}-245 aeration We can find that from Table 2, in the condition of no catalyst, no matter it has light or not, the aeration always produce a COD elimination rate of 8.9-10.2%.
Online since: February 2014
Authors: Siti Zairyn Fakurol Rodzi, Yusairie Mohd
Fig. 2 shows images of atomic force microscopy (AFM) of the pre- treatment and post-thermal treatment NiO films deposited on ITO glass substrates that illustrating the formation of micron-sized grains.
The particle size of the pre-treatment film displays very sharp grains with some voids opened.
This proves that the number of electrons flowing into film is equal to the number of electron extracted from the film.
Online since: July 2006
Authors: Fritz Aldinger, Snezana Bošković, Zoran V. Popović, D. Djurović, M. Čančarević, Z. Dohčević-Mitrović, B. Matović, Matvei Zinkevich
On the other hand, referring to SOFC, the conductivity in the nanocrystalline grain boundary regions is greater than for larger grains [1].
In the X-ray pattern of this sample (Fig. 4), the diffraction lines of the final reaction products CeO2 and NaNO3 were detected, along with the intermediate reaction products that are mainly Ce-nitrates with lower number of crystalline water molecules down to unhydrous Ce nitrate. 10 20 30 40 50 60 70 80 Ce0.80Y0.20O2-y b a Intensity (a.u.) 2 θθθθ (deg) SPRT 10 20 30 40 50 60 70 80 1000 2000 3000 4000 8 8 8 3 4 7 7 7 7 7 7 7 7 6 6 6 6 65 5 5 5 5 55 5 4 4 1 4 4 4 4 3 3 3 3 2 2 1 1 1 1 1 1 1 1-CeO2 2-NaNO3 3-NaOH.2H2O 4-Ce(NO3)3.6H2O 5-Ce(NO3)3.5H2O 6-Ce(NO3)3.4H2O 7-Ce(NO3)3 8-Ce(OH)3 Intensity (a.u.) 2 THETA Fig. 3 X-ray pattern of powder a.
Composition Crystallite size (nm) particle size (nm) SEM Surface area /m 2/g/ True composition Na/wt.%/ CeO2 4,18 16 106.9 Ce0.90Y0.10O2 δ - 4,25 14 103.2 Ce0.904Y0.096O2- δ 0.05 Ce0.85Y0,15O2- δ 4,22 137.1 Ce0.80Y0.20O2- δ 4,99 109.7 Ce0.90Nd0.10O2- δ 4,36 118.4 Ce0.914Nd0.086O2- δ 0.07 Ce0.85Nd0.15O2-δ 4,35 137.6 Ce0.80Nd0.20O2 δ - 4,19 10 141.5 Ce0.80Y0.10Nd0.10O2- δ 4,49 12 110.0 Ce0.828Y0.085Nd0.087O2- δ 0.008* *increased number of rinsing runs a b Fig. 6 Y doped (a) and Y, Nd co-doped (b) ceria solid solution.
Online since: August 2013
Authors: Jie Liu, Xiu Li Feng, Xiao Liu
First the study objects were divided into several layers based on drilling data, grain size of sediments and the physical properties of the solum.
The cores could be broadly divided into 6 to 8 layers on the basis of on-spot record, grain size analysis and geotechnical test results.
Table 1 Physical, mechanical properties and settlement of ZK-1 in different layers Layer number Sediment types Thickness (m) Void ratio Effective unit weight (kN/m3) coefficient of compressibility (Mpa-1) Settlement (cm) Settlement of unit depth (cm/m) 1 ooze 2.3 1.515 6.8 0.868 0.62 0.27 2 silty clay 1.7 0.963 8.3 0.398 0.78 0.46 3 ooze 5.8 0.986 9.7 0.740 12.51 2.16 4 silt 11.5 0.670 10.7 0.260 26.41 2.30 5 clayey silt 18.4 0.664 10.2 0.170 56.94 3.09 6 silty clay 10.6 0.710 10.2 0.260 72.66 6.85 Table 2 Physical, mechanical properties and settlement of ZK-2 in different layers Layer number Sediment types Thickness (m) Void ratio Effective unit weight (kN/m3) coefficient of compressibility (Mpa-1) Settlement (cm) Settlement of unit depth (cm/m) 1 silt 2.6 0.712 9.9 0.120 0.23 0.09 2 silty clay 8.9 0.806 9.5 0.419 14.04 1.58 3 silt 6.1 0.631 10.2 0.182 9.62 1.58 4 silty clay 6.4 0.659 10.2 0.169 13.37 2.09 5 clayey silt 5.5 -- 10.0 -- -- -- 6 silt 6.5 0.680
Online since: April 2012
Authors: Zhao Hui Deng, Piao Long, Sheng Chao Li, Lin Lin Wan
According to the researches done by domestic and foreign scholars on CMP experiments of Si3N4 ceramics, the CeO2 abrasive with the grain size 3000# was applied to configure the water base polishing solution [7].
The DOF of a factor with three levels is 2 (DOF=number of levels-1), so the total DOF of the three-factor experiment is 6 (3×(3-1)).
The S/N ratio (larger-the-better) can be expressed as: Table 3 Response table of S/N ratios Level W(%) R(r/min) F(mm/min) 1 37.54 39.32 39.23 2 37.85 37.77 37.22 3 36.79 35.10 35.73 Delta 1.06 4.22 3.51 Rank 3 1 2 (1) Where is the number of tests and is the experimental value in the th experiment.
When the polishing slurry concentration increases, the amount of abrasive grains entering into chemical reaction increases, effective mechanical lapping increases and chemical reaction is accelerated, which increases the MRR.However, when the polishing slurry concentration is too high, chemical reaction is further enhanced and mechanical lapping decreases, The materials that can not be removed by mechanical action block the abrasive to take part in polishing and MRR decreases.
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