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Online since: October 2014
Authors: Vera Murgul, Nikolay Vatin, Rustam Usmanov
Highly compacted soil beds
The following is stated in a number of scientific studies: as long as the stress-strain ratio of compound tension layers in non-uniform (two-layers) foundations increases due to interactions the thickness should decrease as well.
Sketch drawings of the areas are given in the Figure 2, where the tests № 2-4 have been made with the use of gravel with pebbles, the test № 5 – gravel-pebble with sand, the test № 6 – average-grained sand, and the test №7 – heavy clay loam.
A number of scientific studies deal with the research on reinforcement members having impacts on strain and bearing capacity values of the soils [13-18].
Though the number of experimental and theoretical research studies are still limited.
Sketch drawings of the areas are given in the Figure 2, where the tests № 2-4 have been made with the use of gravel with pebbles, the test № 5 – gravel-pebble with sand, the test № 6 – average-grained sand, and the test №7 – heavy clay loam.
A number of scientific studies deal with the research on reinforcement members having impacts on strain and bearing capacity values of the soils [13-18].
Though the number of experimental and theoretical research studies are still limited.
Online since: June 2014
Authors: Bin Gao, Jian Sheng Zhu, Zhi Fan
The underlying reasons for these phenomena lie in that under high strain rate loading there is a great compression of grains in axial orientation and the head of TA jacket will be formed as mushroom-head, shown as Figure 6.
(a) d=0.25mm (b) d=0.5mm (c) d=1mm Fig.8 Lateral effect of PELE with TFC jacket adopting distinct diameter tungsten fibers During above simulation process, because of the same number and different diameters of tungsten fibers, PELE projectiles have distinct volume fractions of tungsten fibers and unlike density of jacket accordingly.
Fig.9 Axial velocity of PELE debris with Fig.10 Radial velocity of PELE debris with different diameter tungsten fibers different diameter tungsten fibers It can be seen from Figure 9 that provided with same number tungsten fibers, the thicker the tungsten fiber, the bigger the residual axial velocity of PELE with TFC jacket behind target, which means PELE having more adequate penetration ability.
With the same number of tungsten fibers, the thicker the tungsten fiber, the greater the penetration ability and the more difficult to disperse for PELE.
(a) d=0.25mm (b) d=0.5mm (c) d=1mm Fig.8 Lateral effect of PELE with TFC jacket adopting distinct diameter tungsten fibers During above simulation process, because of the same number and different diameters of tungsten fibers, PELE projectiles have distinct volume fractions of tungsten fibers and unlike density of jacket accordingly.
Fig.9 Axial velocity of PELE debris with Fig.10 Radial velocity of PELE debris with different diameter tungsten fibers different diameter tungsten fibers It can be seen from Figure 9 that provided with same number tungsten fibers, the thicker the tungsten fiber, the bigger the residual axial velocity of PELE with TFC jacket behind target, which means PELE having more adequate penetration ability.
With the same number of tungsten fibers, the thicker the tungsten fiber, the greater the penetration ability and the more difficult to disperse for PELE.
Online since: July 2014
Authors: Guo Sheng Zhu, Jia Fa Zhang, Hao Dong Cui, Shao Long Li
There are 24 sample points altogether, among which 12 sample points located on sluice, numbered X1 to X12 from No.1 sluice to left riverbank, separation distance between sample points is 60 meters. 12 sample points are located on downstream of tail channel, among which 6 are on the surface of riverbed numbered C1 to C6, the other 6 points at the bearing surface of tail channel are numbered W1 to W6.
Tab. 5 Optimization of filter material gradation Filter material Grain composition (%) 20.0mm~10.0mm 10.0mm~5.0mm 5.0mm~2.0mm 2.0mm~0.5mm upper grading envelope curve of filter get rid of less than 0.5mm particles 4.65 17.72 77.63 lower grading envelope curve of filter material get rid of less than 0.5mm particles 2.30 5.22 23.09 69.38 From Fig.8 we can see that after getting rid of less than 0.5mm particlesin lower grading envelope curve of filter material, the grading curve which is greater than 0.5mm is not changed, but less than 0.5mm is missing.
Tab. 5 Optimization of filter material gradation Filter material Grain composition (%) 20.0mm~10.0mm 10.0mm~5.0mm 5.0mm~2.0mm 2.0mm~0.5mm upper grading envelope curve of filter get rid of less than 0.5mm particles 4.65 17.72 77.63 lower grading envelope curve of filter material get rid of less than 0.5mm particles 2.30 5.22 23.09 69.38 From Fig.8 we can see that after getting rid of less than 0.5mm particlesin lower grading envelope curve of filter material, the grading curve which is greater than 0.5mm is not changed, but less than 0.5mm is missing.
Online since: February 2013
Authors: Ning Song, Mei Jun Li, Jin Chuan Zhang
Introduction
Carbon number patterns of normal alkanets (n-alkanets), straight chain, have proved of great value in environmental and pale-environmental biomarker-based research and origin information.
Other kind of odd carbon-number dominant distributions of long chain n-alkanets, typically in the range of nC27 to nC31, are characteristic components of the epicuticular leaf waxes of higher plants of high OEP and relative high ratio of Pr/Ph [2].
The black mudstones are uniformly rhythm city depositions in the upper section of E1f2, which is comprised of dark shale’s or marls with well-bedded grain and mudstone or fine sandstones with massive beddings.
Moreover, A strong predominance of even carbon-numbered n-alkanets in the range nC14~nC22 in sediment extracts should be associated with a contribution of organic sediment in hyper saline environments.
Other kind of odd carbon-number dominant distributions of long chain n-alkanets, typically in the range of nC27 to nC31, are characteristic components of the epicuticular leaf waxes of higher plants of high OEP and relative high ratio of Pr/Ph [2].
The black mudstones are uniformly rhythm city depositions in the upper section of E1f2, which is comprised of dark shale’s or marls with well-bedded grain and mudstone or fine sandstones with massive beddings.
Moreover, A strong predominance of even carbon-numbered n-alkanets in the range nC14~nC22 in sediment extracts should be associated with a contribution of organic sediment in hyper saline environments.
Online since: October 2016
Authors: Jun Wang, Bin Zou, Ru Tian, Han Lian Liu, Pei Qi Ge, Peng Yao, Chuan Zhen Huang, Hong Tao Zhu, Ao Liu
In the multi-pass scratching test, the number of friction cycles, N, was varied from 1 to 5.
Fig. 1 also shows that with increasing number of scratching cycles, the role of interfacial friction becomes significant.
But with the increase in the number of cycles, the friction coefficient decreases in the low load regime.
[17] Yifang Cao et al., Nanoindentation Measurements of The Mechanical Properties of Polycrystalline Au and Ag Thin Films on Silicon Substrates: Effects of Grain Size and Film Thickness, J.
Fig. 1 also shows that with increasing number of scratching cycles, the role of interfacial friction becomes significant.
But with the increase in the number of cycles, the friction coefficient decreases in the low load regime.
[17] Yifang Cao et al., Nanoindentation Measurements of The Mechanical Properties of Polycrystalline Au and Ag Thin Films on Silicon Substrates: Effects of Grain Size and Film Thickness, J.
Online since: September 2014
Authors: Jing Li, Dan Lou, Zhen Xiang Xing, Qiang Fu, Shu Hua Dong, Hao Guo
Study on Applicability of Weighted Method for Indexes to Evaluate the Base-System of Water in Naolihe Catchment
Zhenxiang Xing1,2,3, a, Jing LI1,a, Shuhua Dong4,b, Dan Lou4,b,
Qiang Fu1,c,Hao Guo1,a
1School of Water Conservancy & Civil Engineering, Northeast Agricultural University, Heilongjiang, Harbin 150030, China;
2The Collaborative Innovation Centre of Grain Productivity Promotion in Heilongjiang Province, Heilongjiang, Harbin 150030, China;
3The Key Lab of Efficient Utilization of Agricultural Water Resources of Ministry of Agriculture, Heilongjiang, Harbin 150030, China;
4Heilongjiang Province Hydrology Bureau, Harbin, 150001, China
aemail: zxxneau@hotmail.com, bemail: zyg_0807@163.com, cemail: fuqiang100@371.net
Key words: Based-System of Water; Weight Methods; Analytic Hierarchy Process; Entropy Weight Method; Variation Coefficient Method
Abstract: In order to study the applicability of different weighted methods for indexes to evaluate the health status of basin
The entropy weight method, principal component analysis, the variation coefficient method, rough set theory, standard deviation method, etc.; Comprehensive weighting method is the number which carried Weighted calculation of subjective and objective weights value. 1.1 Subjective Weighted Method—Analytic Hierarchy Process (AHP) Analytic Hierarchy Process (AHP) is a decision-made method that divides the relating elements into target layer, criterion layer and program layer to make both quantitative and qualitative analyze, which was put forward by Prof.
To determine the weight with variation coefficient method, firstly assume the number of evaluating indexes is m, the number of evaluating targets is n.
The entropy weight method, principal component analysis, the variation coefficient method, rough set theory, standard deviation method, etc.; Comprehensive weighting method is the number which carried Weighted calculation of subjective and objective weights value. 1.1 Subjective Weighted Method—Analytic Hierarchy Process (AHP) Analytic Hierarchy Process (AHP) is a decision-made method that divides the relating elements into target layer, criterion layer and program layer to make both quantitative and qualitative analyze, which was put forward by Prof.
To determine the weight with variation coefficient method, firstly assume the number of evaluating indexes is m, the number of evaluating targets is n.
Online since: April 2024
Authors: Hong Wu Zhu, Yuan Qing Wang, Yan Lei Xiang, Rong Han, Run Huang, Yu Song Pan
Inhibition zone method: the bacterial solution was diluted by an appropriate number of times, and 100 μL was coated on solid medium and put the sample on top, which was incubated in an incubator at 37℃ for 24 h.
The number of colonies on each medium was counted.
The antimicrobial rate was calculated as in Eq. 2.: Antimicrobial = (M-N)/M×100% (2) Where M and N referred to the number of colonies after 24 h of the control sample and the number of colonies after 24 h of the test sample, respectively. 3.
From Fig. 2(a) and (b), it can be clearly seen that the ZnO crystalline grains exhibit a typical hexagonal structure, which were consist with the result of XRD pattern [36].
Interestingly, With the rise of CNTs content in the composites, the characteristic peak of Zn-O groups slightly shift to high frequency region, which was attributed to the increase the size of ZnO crystal grain [44].
The number of colonies on each medium was counted.
The antimicrobial rate was calculated as in Eq. 2.: Antimicrobial = (M-N)/M×100% (2) Where M and N referred to the number of colonies after 24 h of the control sample and the number of colonies after 24 h of the test sample, respectively. 3.
From Fig. 2(a) and (b), it can be clearly seen that the ZnO crystalline grains exhibit a typical hexagonal structure, which were consist with the result of XRD pattern [36].
Interestingly, With the rise of CNTs content in the composites, the characteristic peak of Zn-O groups slightly shift to high frequency region, which was attributed to the increase the size of ZnO crystal grain [44].
Online since: October 2006
Authors: L. Gavioli, M. Sancrotti
Introduction
Cluster beam deposition (CBD) has opened a number of possibilities for synthesizing innovative
materials, characterized by different physical and functional properties [1,2].
Note that the observed contrast in the SEM image of Fig. 1(a) can be explained considering the difference in the average atomic number Z between dots and substrate, since at 15 KV beam energy the contribution from the secondary electrons is, to a first approximation, similar for the two materials [21].
It was observed indeed, that the expected atomic number contrast between the silicon (white) and the silicon carbide (dark) is observed when only backscattered electrons are detected, while the corresponding secondary plus backscattered electron image shows reversed contrast between the silicon (black) and silicon carbide (white) [33].
Thermal treatment at 1000 °C of the nanostructured film in air induces a grain growth to about 75 nm in size.
Note that the observed contrast in the SEM image of Fig. 1(a) can be explained considering the difference in the average atomic number Z between dots and substrate, since at 15 KV beam energy the contribution from the secondary electrons is, to a first approximation, similar for the two materials [21].
It was observed indeed, that the expected atomic number contrast between the silicon (white) and the silicon carbide (dark) is observed when only backscattered electrons are detected, while the corresponding secondary plus backscattered electron image shows reversed contrast between the silicon (black) and silicon carbide (white) [33].
Thermal treatment at 1000 °C of the nanostructured film in air induces a grain growth to about 75 nm in size.
Online since: November 2012
Authors: Zhi Yuan Wang
Strength at 3 high performance concrete pavement of the match ad in than, the aggregate amount less, coarse aggregate limiting grain size is small.
In the application of high performance concrete bridge, and extend the use fixed number of year of the bridge and gain better economic benefits.
In the position of whole-situ concrete connection, the number of crack resistance reinforcement should increased, combined with the specific condition of the project, the appropriate reinforcement diameter was no more than 8mm, and the appropriate reinforcement spacing settings was dense as possible but not affect the concrete construction of whole situ concrete connection.
There are a number of codes and standards that provide bases for the design of concrete-filled steel box-sections, but there is no unique method to calculate compressive or moment resistance.
In the application of high performance concrete bridge, and extend the use fixed number of year of the bridge and gain better economic benefits.
In the position of whole-situ concrete connection, the number of crack resistance reinforcement should increased, combined with the specific condition of the project, the appropriate reinforcement diameter was no more than 8mm, and the appropriate reinforcement spacing settings was dense as possible but not affect the concrete construction of whole situ concrete connection.
There are a number of codes and standards that provide bases for the design of concrete-filled steel box-sections, but there is no unique method to calculate compressive or moment resistance.
Online since: December 2014
Authors: Parlad Kumar, Rupinder Singh, I.P.S. Ahuja
However, if the required number of pieces are less as in prototyping and design iterations; design optimisation; customised and specialised component productions, the high cost of tooling makes the investment casting prohibitively expensive.
There are a large number of conflicting factors which influence the surface finish and dimensional accuracy of FDM independently or in interaction with others [12].
After attaching the models to the tree the slurry layers are deposited by dipping three repeatedly in slurry tanks of different grain sizes in order to make a permeable shell around the plastic tree.
There is a lack of experimental studies to report the effect of number of layers and change in cooling rate on metallurgical/mechanical properties of the casting.
There are a large number of conflicting factors which influence the surface finish and dimensional accuracy of FDM independently or in interaction with others [12].
After attaching the models to the tree the slurry layers are deposited by dipping three repeatedly in slurry tanks of different grain sizes in order to make a permeable shell around the plastic tree.
There is a lack of experimental studies to report the effect of number of layers and change in cooling rate on metallurgical/mechanical properties of the casting.