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Online since: October 2013
Authors: Yu Zhuo Jia, Mei Qi Wang, Jun Zhang, Jing Liu
DL/ T 5219—2005 Requested,Foundation design must adhere to environmental protection and resource conservation principles.Consider the Line Terrain,construction conditions , geotechnical engineering investigation data , considering the foundation type and design programs,designed to meet the basic safety , economical and reasonable purposes.
Current research methods are mainly theoretical , numerical simulation , and model and field testing.Theoretical calculations difficult to fully consider the actual engineering of complex stress state and boundary conditions , the practical problems must be simplified and assumptions.Model and field trials in the short term to get more systematic and regularity results, but costly and time consuming and can only obtain data under certain conditions .The numerical simulation method is repeatable , can better consider the actual project conditions, has become an important research question geotechnical engineering methods.In this paper, finite element program based on the novel composite force by pulling on the numerical simulation of the situation , so as to provide valuable engineering design future reference.
Based on the analysis of the new compound foundation The deformation of the foundation Fig. 3 Foundation deformation From figure 3,along the top to the base direction of the observation group,Maximum displacement values appear in the top of the pile,The farther away from the pile at the top of the pile smaller displacement,and reduction in the magnitude of the displacement pile with the size and diameter.
Current research methods are mainly theoretical , numerical simulation , and model and field testing.Theoretical calculations difficult to fully consider the actual engineering of complex stress state and boundary conditions , the practical problems must be simplified and assumptions.Model and field trials in the short term to get more systematic and regularity results, but costly and time consuming and can only obtain data under certain conditions .The numerical simulation method is repeatable , can better consider the actual project conditions, has become an important research question geotechnical engineering methods.In this paper, finite element program based on the novel composite force by pulling on the numerical simulation of the situation , so as to provide valuable engineering design future reference.
Based on the analysis of the new compound foundation The deformation of the foundation Fig. 3 Foundation deformation From figure 3,along the top to the base direction of the observation group,Maximum displacement values appear in the top of the pile,The farther away from the pile at the top of the pile smaller displacement,and reduction in the magnitude of the displacement pile with the size and diameter.
Online since: March 2015
Authors: Dan Qi, Wen Cang Zhao, Bo Tong
The image data of each region is generated histogram of statistics.
As can be seen from the data in Table 1, because of the information extracted accompanied by the elements in histogram, the more information of face image extracted, the higher recognition rate.
Deficiencies are that dimensionality reduction will be worse with amount of elements while a lot of computing is needed.
As can be seen from the data in Table 1, because of the information extracted accompanied by the elements in histogram, the more information of face image extracted, the higher recognition rate.
Deficiencies are that dimensionality reduction will be worse with amount of elements while a lot of computing is needed.
Online since: December 2006
Authors: Jiang Tao Zhang, Li Sheng Liu, Dong Feng Cao
Macroscopic and
microscopic analyses show that, when subjected to impact loadings leading to dynamic
fragmentation, the R-SiC ceramic infiltrated with aluminum shows a significant reduction in
cracking density when compared to the raw R-SiC material.
Despite the availability of experimental data documenting the brittle failure of ceramic, very few quantitative investigations have been performed addressing the role of the microstructure feature in the observed failure mechanisms.
Experiment data Linear fit a b csplitted into several relatively integral parts; for crushed mode, the tested specimen under impact is crushed completely.
Despite the availability of experimental data documenting the brittle failure of ceramic, very few quantitative investigations have been performed addressing the role of the microstructure feature in the observed failure mechanisms.
Experiment data Linear fit a b csplitted into several relatively integral parts; for crushed mode, the tested specimen under impact is crushed completely.
Online since: August 2009
Authors: Shou Gang Chen, Xue Ting Chang, Sha Cheng, Tao Liu, Yan Sheng Yin
The main changes at this interface are
the lower of the pH value and the reduction of oxygen tension [2], leading to the acceleration of
namely microbially influenced corrosion (MIC).
The EIS data were measured at OCP with sine wave voltages (10 mV) peak to peak in a frequency range of 10 kHz-0.01 Hz.
The experimental data were interpreted on the basis of equivalent analogs using the program Zview 2.0 to obtain the fitting parameters. 3.
The EIS data were measured at OCP with sine wave voltages (10 mV) peak to peak in a frequency range of 10 kHz-0.01 Hz.
The experimental data were interpreted on the basis of equivalent analogs using the program Zview 2.0 to obtain the fitting parameters. 3.
Online since: November 2011
Authors: Xiang Zhen Yan, Yun Hong Ding, Bao Hui Wang
The linear interpolation formulas are described as:
(14)
where is the time,; When the equation (14) is substituted into equation (13), after simplifying there results:
(15)
where = the tangent stiffness matrix; = the integral parameter,
Using total content instead of pressure increment, the equation (15) becomes
(16)
(17)
Example Analyses
The author picks the eastern part of the Ordos Basin Daning-Jixian Region JS-3 well's production data to carry on the fitting computation by using this model.
The production data of JS-3 well is carried on for fitting computation.
Table I Parameter Values Of Coal Seam ID Parameter 1 Well diameter(mm) 70 2 Initial pressure(MPa) 11.475 3 Porosity(%) 2.07-2.36 4 Temperature(℃) 28.29 5 Density(t/m3) 1.47 6 Langmuir volume(m3/t) 39.91 7 Langmuir pressure(MPa) 3.034 8 Diffusion coefficient(cm2/t) 2.50E-7 9 Face cleats permeability(μm2) 0.1E-3 10 Butt cleats permeability(μm2) 0.06 E-3 11 Vertical permeability(μm2) 0.02 E-3 Acknowledgment The authors are very much indebted to the China National Science and Technology Major Project (Contract No. 2008ZX05037) References [1] Jishan Liu ,Zhongwei Chen, Derek Elsworth, et al .”Linking gas-sorption induced changes in coal permeability to directional strains through a modulus reduction ratio” .International Journal of Coal Geology, vol. 1, pp. 21-30, March 2010
The production data of JS-3 well is carried on for fitting computation.
Table I Parameter Values Of Coal Seam ID Parameter 1 Well diameter(mm) 70 2 Initial pressure(MPa) 11.475 3 Porosity(%) 2.07-2.36 4 Temperature(℃) 28.29 5 Density(t/m3) 1.47 6 Langmuir volume(m3/t) 39.91 7 Langmuir pressure(MPa) 3.034 8 Diffusion coefficient(cm2/t) 2.50E-7 9 Face cleats permeability(μm2) 0.1E-3 10 Butt cleats permeability(μm2) 0.06 E-3 11 Vertical permeability(μm2) 0.02 E-3 Acknowledgment The authors are very much indebted to the China National Science and Technology Major Project (Contract No. 2008ZX05037) References [1] Jishan Liu ,Zhongwei Chen, Derek Elsworth, et al .”Linking gas-sorption induced changes in coal permeability to directional strains through a modulus reduction ratio” .International Journal of Coal Geology, vol. 1, pp. 21-30, March 2010
Online since: October 2006
Authors: R.D. Vispute, Kenneth A. Jones, Michael A. Derenge, Shiva S. Hullavarad, Jaime A. Freitas
However, we have obtained considerable experimental data of their properties
by examining the luminescence of B implanted and B and C co-implanted 4H-SiC
annealed at various temperatures using a (BN/AlN) cap [3].
An UV-sensitive GaAs photomultiplier coupled to a computer-controlled photon counter is used for data acquisition and manipulation.
The relative peak heights in both sample sets decreases with increasing TA, indicating a partial reduction of the defect concentration [4].
An UV-sensitive GaAs photomultiplier coupled to a computer-controlled photon counter is used for data acquisition and manipulation.
The relative peak heights in both sample sets decreases with increasing TA, indicating a partial reduction of the defect concentration [4].
Online since: July 2011
Authors: Jing Wei, Xiao Wei Fan, Lan Yu Huang, Hui Fan Zheng
Measurement devices are connected to a data acquisition board to obtain simultaneous readings.
All devices used for data acquisition are calibrated.
The structure of thread spiral Date Reduction In the experiment, the outer water is heated, and the inner water is cooled, and the heat capacity of the exchanger is based on the heat release of inner water.
All devices used for data acquisition are calibrated.
The structure of thread spiral Date Reduction In the experiment, the outer water is heated, and the inner water is cooled, and the heat capacity of the exchanger is based on the heat release of inner water.
Online since: January 2011
Authors: Christian Ghermec, Mario Trotea, Olimpia Ghermec
Table 1 The evolution of density of cylindrical parts during carburizing – sintering at different temperatures
Compaction pressure
[MPa]
Carburizing time
[ hours]
Density before carburizing [g/cm3]
Density after sintering
[g/cm3]
1050oC
1100oC
1150oC
1050oC
1100oC
1150oC
400
2
6,44
6,42
6,44
6,62
6,78
6,87
4
6,45
6,47
6,45
6,82
6,93
7,01
6
6,43
6,46
6,44
7,12
7,16
7,23
600
2
6,83
6,87
6,86
6,99
7,04
7,06
4
6,83
6,87
6,86
7,04
7,10
7,13
6
6,81
6,87
6,85
7,08
7,14
7,16
Data analysis shows that by the carburizing – sintering of the cylindrical samples at the same temperature is confirmed the theory according to which the dimensions of the parts decrease during sintering, which leads of the densification of the material.
The evolution of the density of cylindrical parts depending on the temperature and on the compaction pressure a - at 2 hours carburizing, b - at 4 hours carburizing, c - at 6 hours carburizing From the graphic representations it is observed that as a consequence of the intense reduction on the dimensions of the parts pressed at 400 MPa, densification, too presents a higher variation at this compaction pressure.
In the case of the samples compacted at higher pressures (600 MPa), density decreases to ρ = 7.12 g/cm3 for the same conditions of carburizing – sintering; based upon this data it is observed the fact that unlike classic sintered steels, where density grows together with the growth in compaction pressure, in the case of the new steels elaborated thorough carburizing – sintering, the phenomenon is reverse, meaning that density grows for lower compaction pressures
The evolution of the density of cylindrical parts depending on the temperature and on the compaction pressure a - at 2 hours carburizing, b - at 4 hours carburizing, c - at 6 hours carburizing From the graphic representations it is observed that as a consequence of the intense reduction on the dimensions of the parts pressed at 400 MPa, densification, too presents a higher variation at this compaction pressure.
In the case of the samples compacted at higher pressures (600 MPa), density decreases to ρ = 7.12 g/cm3 for the same conditions of carburizing – sintering; based upon this data it is observed the fact that unlike classic sintered steels, where density grows together with the growth in compaction pressure, in the case of the new steels elaborated thorough carburizing – sintering, the phenomenon is reverse, meaning that density grows for lower compaction pressures
Online since: January 2012
Authors: Xue Dao Shu, Guang Xian Shen, De Yi Liu
There are two traditional methods for treating this kind of problem: one is to abstract and simplify the objects, because a great deal of simplification exists in this calculation method, the calculation accuracy is low; the other is recursive method according to experimental data, though this method can guide production, but it can’t explain the rolling mechanics well.
The aim of this calculating method is to simply data input.
Table.3 Rolling parameters Backup roll Work roll Rolled piece Elastic Module(E/GPa) 210 210 206 Poisson ratio() 0.3 0.3 0.3 Roller radius(R/mm) 750 300 Length(L/mm) 2030 2230 1850 Friction coefficient() 0.1 0.1 0.08 reduction rate(%) 20 Forward tension (T1/N) 2430 Initially thickness of piece (/mm) 1.25 As displayed in Fig.5, the chart of contact pressure distribution on rolled piece surface is obtained through computation and analysis.
The aim of this calculating method is to simply data input.
Table.3 Rolling parameters Backup roll Work roll Rolled piece Elastic Module(E/GPa) 210 210 206 Poisson ratio() 0.3 0.3 0.3 Roller radius(R/mm) 750 300 Length(L/mm) 2030 2230 1850 Friction coefficient() 0.1 0.1 0.08 reduction rate(%) 20 Forward tension (T1/N) 2430 Initially thickness of piece (/mm) 1.25 As displayed in Fig.5, the chart of contact pressure distribution on rolled piece surface is obtained through computation and analysis.
Online since: May 2005
Authors: Giuseppe Bertuccio, R. Casiraghi, Claudio Manfredotti, E. Vittone, A. Lo Giudice, F. Fizzotti, Stefano Bianco, M. Jaksic, P. Oliveira
The experimental data have been analyzed with a one-dimensional model
which provides the charge collection profile as a function of the ion fluence.
The solid curve in Fig. 2 shows the fit of the experimental data by means of the obtained numerical solutions, being the product (k · σd · vth) the unknown parameter.
Summary An analysis of the reduction of the performances of a 4H-SiC nuclear detector due to 2 MeV proton bombardment is presented.
The solid curve in Fig. 2 shows the fit of the experimental data by means of the obtained numerical solutions, being the product (k · σd · vth) the unknown parameter.
Summary An analysis of the reduction of the performances of a 4H-SiC nuclear detector due to 2 MeV proton bombardment is presented.