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Online since: July 2013
Authors: M.A. Shah
Robert Brown’s 1827 observation of the seemingly random movement of pollen grains [1] led to the understanding of the motion that still bears his name, and ultimately to the formulation of statistical mechanics.
The size of the interaction volume depends on the electron's landing energy, the atomic number of the specimen and the specimen's density.
The typical micrograph of ZnO nanorods taken by SEM As mentioned that as the electrons strike and penetrate the surface as shown in Figure 3, a number of following interactions occur that results in the emission of electrons and photons from the sample.
Because the intensity of the BSE signal is strongly related to the atomic number (Z) of the specimen, BSE images can provide information about the distribution of different elements in the sample.
Inelastic interactions between primary electrons and sample electrons at heterogeneities such as grain boundary dislocations, second phase particles, defects, density variations etc cause complex absorption and scattering effects, leading to spatial variation in the intensity of the transmitted electrons.
The size of the interaction volume depends on the electron's landing energy, the atomic number of the specimen and the specimen's density.
The typical micrograph of ZnO nanorods taken by SEM As mentioned that as the electrons strike and penetrate the surface as shown in Figure 3, a number of following interactions occur that results in the emission of electrons and photons from the sample.
Because the intensity of the BSE signal is strongly related to the atomic number (Z) of the specimen, BSE images can provide information about the distribution of different elements in the sample.
Inelastic interactions between primary electrons and sample electrons at heterogeneities such as grain boundary dislocations, second phase particles, defects, density variations etc cause complex absorption and scattering effects, leading to spatial variation in the intensity of the transmitted electrons.
Online since: September 2013
Authors: Mojdeh Zargaran, Nader K.A. Attari, Parisa Teymouri
Experiments
Special geometry of the textile limits the maximum grain size to 2 mm.
Curves b to e refers to TRC samples with different number of fabric layers.
Although by increasing the number of fabric layers in sample, ultimate loads increases, but all samples have a strain-softening behavior.
Load- deflection curves of samples strengthened with different number of fabric layers made up Nylon yarns with 430 tex are presented in Fig. 4.
The comparison of samples with the same number of fabric layers but different finesses show that coarser yarns have higher flexural values than finer yarns.
Curves b to e refers to TRC samples with different number of fabric layers.
Although by increasing the number of fabric layers in sample, ultimate loads increases, but all samples have a strain-softening behavior.
Load- deflection curves of samples strengthened with different number of fabric layers made up Nylon yarns with 430 tex are presented in Fig. 4.
The comparison of samples with the same number of fabric layers but different finesses show that coarser yarns have higher flexural values than finer yarns.
Online since: July 2012
Authors: Jian Jun Hao, Yue Jin Ma, Jian Chang Li, Jian Guo Zhao, Xiong Zhuang Li
In addition, its jolting can not only check the production of welding defect, but also refine crystal grain.
The setting distance of run and speed can be transformed to step number and timing constant.
According to the number of high-low electrical level, the time width of high-low electrical level can be got as following formula: S=50M (4) Where, S is time width, and M the number of high-low electrical level.
It decides the number of close press-button and adopts corresponding treatment.
The setting distance of run and speed can be transformed to step number and timing constant.
According to the number of high-low electrical level, the time width of high-low electrical level can be got as following formula: S=50M (4) Where, S is time width, and M the number of high-low electrical level.
It decides the number of close press-button and adopts corresponding treatment.
Online since: September 2014
Authors: Min Zhang, Guo Fang Zhang, Yu Xi Jia
There are two parameters, n and, used in MesoDyn simulations to describe the number of Gaussian beads and the interaction between beads.
2.2 The MesoDyn model and parameters.
To map the representative polymer chains onto Gaussian chains, the bead number (n) can be got by Eq.1: (1) where n is the number of the beads, Nmono is the chain length of monomer and C∞ is the characteristic ratio of monomer.
So the number of two beads is 7.
After the coarse grain step, the smallest elements change into beads.
To map the representative polymer chains onto Gaussian chains, the bead number (n) can be got by Eq.1: (1) where n is the number of the beads, Nmono is the chain length of monomer and C∞ is the characteristic ratio of monomer.
So the number of two beads is 7.
After the coarse grain step, the smallest elements change into beads.
Online since: April 2003
Authors: Bong Goo Lee, Hon Jong Choi, Seok Woo Lee
Relation between the amount of grit and MRR
Fig. 4 shows the predicted relation between the MRR and the number of the working abrasive
particles.
From this figure it becomes clear that the MRR increases as the number of abrasive particles decreases.
The type of the grain material does not materially affect the diameter of holes.
USM has been verified as a good method along with a number of conventional and non-conventional machining techniques for brittle materials.
In order to ensure the accuracy and a good finished surface, it is better to use different tool diameter and more than one size of the abrasive grain
From this figure it becomes clear that the MRR increases as the number of abrasive particles decreases.
The type of the grain material does not materially affect the diameter of holes.
USM has been verified as a good method along with a number of conventional and non-conventional machining techniques for brittle materials.
In order to ensure the accuracy and a good finished surface, it is better to use different tool diameter and more than one size of the abrasive grain
Online since: April 2015
Authors: Vít Petranek, Jana Vysoka, Zdenek Caha, Jan Plachý, Radek Vejmelka
The BWSs were then divided according to their top surfacing to those with coarse grain gritting, those with fine grain gritting and those without gritting.
With regard to the low number of the specimens and their classification was concerned, non-parametric statistical tests (paired Wilcoxon’s test and Kruskal-Wallis test) were applied.
Specimen Characteristics /Specimen Number 2 3 4 6 7 8 9 10 11 12 13 Absorption according to ČSN 503602, 30 days (%) 1.59 1.49 0.38 1.54 1.51 2.03 1.22 1.3 7.79 1.8 6.54 Absorption according to EN 14 223, 28 days (%) 0.8 1.3 0.9 0.8 0.4 0.6 0.7 1.3 4.4 0.7 4.1 Specimen Characteristics /Specimen Number 14 15 16 17 18 19 20 21 22 23 25 Absorption according to ČSN 503602, 30 days (%) 0.94 2.71 0.84 1.55 1.05 1.79 0.95 1.28 1.76 2 1.3 Absorption according to EN 14 223, 28 days (%) 0.4 1.6 0.4 0.6 0.2 0.5 0.5 0.8 0.9 0.2 1.3 3.2.
We can assume that if a higher number of values were available for processing the impact of the bitumen substance type on the weight absorption would prove more significant.
Despite the fact that its influence did not directly prove itself at the chosen significance level from the available sources, it is justifiable to assume that the influence would prove itself in a higher number of specimens and this parameter also deserves attention.
With regard to the low number of the specimens and their classification was concerned, non-parametric statistical tests (paired Wilcoxon’s test and Kruskal-Wallis test) were applied.
Specimen Characteristics /Specimen Number 2 3 4 6 7 8 9 10 11 12 13 Absorption according to ČSN 503602, 30 days (%) 1.59 1.49 0.38 1.54 1.51 2.03 1.22 1.3 7.79 1.8 6.54 Absorption according to EN 14 223, 28 days (%) 0.8 1.3 0.9 0.8 0.4 0.6 0.7 1.3 4.4 0.7 4.1 Specimen Characteristics /Specimen Number 14 15 16 17 18 19 20 21 22 23 25 Absorption according to ČSN 503602, 30 days (%) 0.94 2.71 0.84 1.55 1.05 1.79 0.95 1.28 1.76 2 1.3 Absorption according to EN 14 223, 28 days (%) 0.4 1.6 0.4 0.6 0.2 0.5 0.5 0.8 0.9 0.2 1.3 3.2.
We can assume that if a higher number of values were available for processing the impact of the bitumen substance type on the weight absorption would prove more significant.
Despite the fact that its influence did not directly prove itself at the chosen significance level from the available sources, it is justifiable to assume that the influence would prove itself in a higher number of specimens and this parameter also deserves attention.
Online since: October 2010
Authors: Zhe He Yao, Zi Chen Chen, Hong Hua Zhou
After induction heating, the grains will be globular, which enable the semi-solid slurry to fill complex micro-cavities with lower forming load.
Fig. 2 shows the grain globalization of the billet.
To estimate the quality of every workpiece, average height (Ha) and relative standard deviation (RSD) are introduced: (1) (2) where n is the number of micro-pin-fins selected, n equals to 9 in this study, Xi is the height of each pin-fin.
To estimate the quality of different levels, Ki is introduced, (3) where Si is the sum of the corresponding test results and mi is the number of experiments at the each level, when certain factor is on level i.
Fig. 2 shows the grain globalization of the billet.
To estimate the quality of every workpiece, average height (Ha) and relative standard deviation (RSD) are introduced: (1) (2) where n is the number of micro-pin-fins selected, n equals to 9 in this study, Xi is the height of each pin-fin.
To estimate the quality of different levels, Ki is introduced, (3) where Si is the sum of the corresponding test results and mi is the number of experiments at the each level, when certain factor is on level i.
Online since: January 2012
Authors: Xin Gui Zhang, Xiang Gang Kong
Low-strain Dynamic Pile-test Result
Diameter
(mm)
Length
(m)
Number
ⅠCategory Pile Scale
(%)
500
3.0~5.2
181
97.5
5.3~6.0
19
100
400
2.8~5.0
15
87
5.0~6.0
1
100
300
3.0~5.2
20
90
5.3~6.2
20
90
6.3~7.2
7
100
Engineering Geologic Condition
According to the detailed geotechnical investigation report [2], the superimcumbent bed is a newly formed deposit of miscellaneous fill①.
Log and Geotechnical Parameters for the Site Index Name Soil Thickness Color State Natural unit weight Cohesion Angle of internal friction Bearing capacity eigenvalue Modulus of compressibility /m - - kN/m2 /kPa /Degree /kPa /MPa Miscellaneous fill ① 0.2~3.8 variegated A bit wet ~Wet 18 5 9 80 5 clay ② 1.2~6.50 isabelline Plastic ~Stiff plastic 19.1 40 14 280 9.2 silty clay ③ 1.20~6.50 Yellow, Mauve A bit wet,Plastic 19.9 12 24 190 8.5 silty sand ④ 0.40~5.00 Isabelline, Mauve, Red Wet,Sand 19.7 6 29 170 8.9 medium sand ⑤ 0.3~5.50 Yellow Very wet~ Saturated 20.0 0 31 200 12 gravelly sand ⑥ 0.80~6.80 Yellow Medium~ Close-grained 20.2 0 33 350 15 pebble ⑦ 1.2~10.70 Offwhite, Fulvous Saturated, Medium~ Close-grained 20.2 0 35 400 20 lacustrine deposit ⑧ 1.30~6.70 Gray, taupe Strong Weathering, Hard 22.5 52 20 600 22 silty mudstone ⑨ medium thickness seam Caesious, Gray Medium Weathering, Hard 22.5 110 22 800 25 Static Load test of single pile This project
Results of Pile Static Loading Test Item Test Parameters Pile number # 8# 50# 115# 294# 361# 458# 461# 582# 618# 869# Pile diameter /m 0.5 0.5 0.3 0.5 0.3 0.5 0.5 0.5 0.5 0.5 Pile length /m - 4.59 5.66 4.86 5.86 3.34 3.7 4.09 2.99 3.83 Pile tip resistance eigenvalue /kPa 800 1611 800 1611 800 1611 1611 1611 1611 1611 Unloading spring back deformation /mm 0.32 4.01 9.70 1.01 0.30 2.93 6.60 3.64 7.62 - Residual settlement /mm 13.99 19.59 2.99 17.17 10.22 7.93 14.36 18.06 25.54 - vertical allowable load capacity of single pile (QU) /kN 1600 3200 1600 3270 1600 3360 3360 3200 3280 2880 Stability - Stable Stable Stable Stable Stable Stable Stable Stable Stable Unstable time to achieve stability/instability /min 540 1170 630 1200 540 1230 1200 1140 1260 1290 Total test duration /min 690 1590 780 1620 690 1530 1500 1560 1560 1290 pile shaft completeness - - ⅠCategory ⅠCategory ⅠCategory ⅡCategory ⅠCategory ⅠCategory ⅠCategory ⅠCategory ⅠCategory According to the test data of 8#, 84# and
Log and Geotechnical Parameters for the Site Index Name Soil Thickness Color State Natural unit weight Cohesion Angle of internal friction Bearing capacity eigenvalue Modulus of compressibility /m - - kN/m2 /kPa /Degree /kPa /MPa Miscellaneous fill ① 0.2~3.8 variegated A bit wet ~Wet 18 5 9 80 5 clay ② 1.2~6.50 isabelline Plastic ~Stiff plastic 19.1 40 14 280 9.2 silty clay ③ 1.20~6.50 Yellow, Mauve A bit wet,Plastic 19.9 12 24 190 8.5 silty sand ④ 0.40~5.00 Isabelline, Mauve, Red Wet,Sand 19.7 6 29 170 8.9 medium sand ⑤ 0.3~5.50 Yellow Very wet~ Saturated 20.0 0 31 200 12 gravelly sand ⑥ 0.80~6.80 Yellow Medium~ Close-grained 20.2 0 33 350 15 pebble ⑦ 1.2~10.70 Offwhite, Fulvous Saturated, Medium~ Close-grained 20.2 0 35 400 20 lacustrine deposit ⑧ 1.30~6.70 Gray, taupe Strong Weathering, Hard 22.5 52 20 600 22 silty mudstone ⑨ medium thickness seam Caesious, Gray Medium Weathering, Hard 22.5 110 22 800 25 Static Load test of single pile This project
Results of Pile Static Loading Test Item Test Parameters Pile number # 8# 50# 115# 294# 361# 458# 461# 582# 618# 869# Pile diameter /m 0.5 0.5 0.3 0.5 0.3 0.5 0.5 0.5 0.5 0.5 Pile length /m - 4.59 5.66 4.86 5.86 3.34 3.7 4.09 2.99 3.83 Pile tip resistance eigenvalue /kPa 800 1611 800 1611 800 1611 1611 1611 1611 1611 Unloading spring back deformation /mm 0.32 4.01 9.70 1.01 0.30 2.93 6.60 3.64 7.62 - Residual settlement /mm 13.99 19.59 2.99 17.17 10.22 7.93 14.36 18.06 25.54 - vertical allowable load capacity of single pile (QU) /kN 1600 3200 1600 3270 1600 3360 3360 3200 3280 2880 Stability - Stable Stable Stable Stable Stable Stable Stable Stable Stable Unstable time to achieve stability/instability /min 540 1170 630 1200 540 1230 1200 1140 1260 1290 Total test duration /min 690 1590 780 1620 690 1530 1500 1560 1560 1290 pile shaft completeness - - ⅠCategory ⅠCategory ⅠCategory ⅡCategory ⅠCategory ⅠCategory ⅠCategory ⅠCategory ⅠCategory According to the test data of 8#, 84# and
Online since: December 2011
Authors: Maria Sozańska
Process parameters used were as (Fig.1): hydrogenation - soaking 30 min. at 650 °C (variant A and B), cyclic heat treatment - cooling to a temperature of 250 °C and soak for 30 minutes, number of cycles – 3: temperature 650 °C (variant A) or temperature 950 °C (variant B), gas atmosphere of 100% H2, dehydrogenation - soaking 30 min. at 550 °C in a vacuum, cooling after hydrogenation in a vacuum.
Some difference of the dimension grain is visible.
The alloy microstructure consists of alternately arranged lamellar precipitations of a and b phases with different orientations; in particular, grains.
At the same time, however, this was accompanied by a much greater number of microcracks.
Some difference of the dimension grain is visible.
The alloy microstructure consists of alternately arranged lamellar precipitations of a and b phases with different orientations; in particular, grains.
At the same time, however, this was accompanied by a much greater number of microcracks.
Online since: July 2013
Authors: Vladimir Tsepelev
The increase of nanocrystalline annealing temperature is known to result in the nanocrystalline grains formation, their size changing as well as the crystal and amorphous phases` volumes proportion and the phase structure of the alloy [5, 6, 7].
A number of models and programs are designed to calculate ν from the known δ.
The numbers near the curves denote the thermal diagrams of the three regimes.
The distribution of the nanocrystalline grains of sizes ranging 1-20 nm depending on annealing temperatures of toroidal magnetic circuit has been shown.
A number of models and programs are designed to calculate ν from the known δ.
The numbers near the curves denote the thermal diagrams of the three regimes.
The distribution of the nanocrystalline grains of sizes ranging 1-20 nm depending on annealing temperatures of toroidal magnetic circuit has been shown.