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Online since: April 2021
Authors: Sergiy V. Divinski, Alexander V. Pokoev, Julia V. Osinskaya, François Jomard, Cécilie Duhamel, Aloke Paul, Daniel Gärtner, Vladimir A. Esin, Lisa Belkacemi, Andrey A. Fedotov, Juliana Schell
A special attention will be
paid to the application of the SIMS profiling to fine grained materials with potentially a strong heterogeneity
of the local kinetic properties.
Furthermore, each sectioning method has its benefits depending on materials properties.
Thus, depending on the material properties, fine sections with a thickness down to about 0.3 µm up to comparable rough sections with a thicknessof several tens of microns can be produced.
These alloys are exemplary for the mechanical sectioning method due to the materials properties [53, 54, 55, 56, 57].
The accuracy of the XRD determination of the diffusion coefficient is determined by several factors: 1.
Furthermore, each sectioning method has its benefits depending on materials properties.
Thus, depending on the material properties, fine sections with a thickness down to about 0.3 µm up to comparable rough sections with a thicknessof several tens of microns can be produced.
These alloys are exemplary for the mechanical sectioning method due to the materials properties [53, 54, 55, 56, 57].
The accuracy of the XRD determination of the diffusion coefficient is determined by several factors: 1.
Online since: July 2011
Authors: Zhi Yong Jia
Introduction
Since the discovery of carbon nanotubes in 1991 [1], One-dimension (1D) nanomaterials such as nanotubes, nanowires and nanorods have attracted extensive interest because of their novel chemical and physical properties, as well as wide-ranging applications in electronic, optical, mechanical, and bioscience applications [2-7].As a result, diverse synthetic routes have been directed to achieve 1D nanostructures such as sol-gel route, hydrothermal method, solid-state method, vapor-liquid-solid (VLS), etc [8-11].
In further experiment, we found that the amount of Na2CO3 presented in the parent solution is also an important factor which affected the morphologies of the products.
Hence, the presence of CO32- in the parent solution and the ultrasound irradiation are important factors for the nucleation and growth of 1D MSn(OH)6 (Ba, Ca, Sr) nanostructures.
In further experiment, we found that the amount of Na2CO3 presented in the parent solution is also an important factor which affected the morphologies of the products.
Hence, the presence of CO32- in the parent solution and the ultrasound irradiation are important factors for the nucleation and growth of 1D MSn(OH)6 (Ba, Ca, Sr) nanostructures.
Online since: April 2012
Authors: Thierry Baudin, H. Paul, K. Kudłacz, A. Morawiec
., Poland
2Opole University of Technology, Mechanical Department, 5 Mikołajczyka St., 45-271 Opole, Poland
3Université Paris-Sud, ICMMO, CNRS UMR 8182, Laboratoire de Physico-Chimie de l’Etat Solide, Orsay, F-91405, France
Keywords: Orientation Imaging Microscopy, texture, AA3104 aluminum alloy, microstructure, severe plastic deformation
Abstract.
Introduction Severe plastic deformation (SPD) is very often used for the improvement of strength properties of aluminium alloys by converting the conventional coarse-grained metals into ultra-fine grained materials [1, 2].
However, the temperature stability of these structures (i.e. resistance to coarsening) is one of the most important factors determining the ability of the material to ‘conserve’ fine grains in the further hot shaping [3-6].
For both modes of deformation, the presence of large second phase particles (LSPP) is the main common factor influencing structure refinement.
It is well-know that non-deformable, large second phase particles strongly affect the deformation process by the occurrence of deformation zones around them.
Introduction Severe plastic deformation (SPD) is very often used for the improvement of strength properties of aluminium alloys by converting the conventional coarse-grained metals into ultra-fine grained materials [1, 2].
However, the temperature stability of these structures (i.e. resistance to coarsening) is one of the most important factors determining the ability of the material to ‘conserve’ fine grains in the further hot shaping [3-6].
For both modes of deformation, the presence of large second phase particles (LSPP) is the main common factor influencing structure refinement.
It is well-know that non-deformable, large second phase particles strongly affect the deformation process by the occurrence of deformation zones around them.
Online since: December 2022
Authors: Sadiq S. Muhsun, Najeeb Fadhil Alnsrawy
The purpose of this paper is to develop a CFD simulation of pollutant transport through multi-porous media that considers the effect of hydraulic parameters and porous media properties on the concentration and distribution of pollutants through the media that have not been considered in previous work and research.
It's also used in air pollution management and a variety of chemical engineering procedures [14]. 1.1.2 PRECIPITATION The movement of some heavy metal ions in porous media may be affected by the sedimentation process, where they are deposited in the form of solid materials when interacting with some compounds, especially salts, such as the iron element we use in this study, part of which is deposited when interacting with sulfate salts, and the following Eq.1 shows this [15].
THE RESULTS OF THE KD EXPERIMENT AND THE POLLUTANT TRANSFER EXPERIMENT THROUGH POROUS MEDIA SHOWED THAT THE ADSORPTION PROCESS IS NOT THE ONLY EFFECT TO GET RID OF THE POLLUTANT, AS THE SEDIMENTATION FACTOR DUE TO SALTS SHOWED A BIG ROLE.
THE KD FACTOR PLAYS THE LARGEST ROLE IN THE PROCESS OF GETTING RID OF THE POLLUTANT, WHILE THE ROLE OF THE POROUS VELOCITY HAS BECOME LESS DUE TO THE OVERLAP OF THE SEDIMENTATION PROCESS.
[6] Chrysikopoulos C V, Kitanidis P K and Roberts P V , Analysis of one‐dimensional solute transport through porous media with spatially variable retardation factor.
It's also used in air pollution management and a variety of chemical engineering procedures [14]. 1.1.2 PRECIPITATION The movement of some heavy metal ions in porous media may be affected by the sedimentation process, where they are deposited in the form of solid materials when interacting with some compounds, especially salts, such as the iron element we use in this study, part of which is deposited when interacting with sulfate salts, and the following Eq.1 shows this [15].
THE RESULTS OF THE KD EXPERIMENT AND THE POLLUTANT TRANSFER EXPERIMENT THROUGH POROUS MEDIA SHOWED THAT THE ADSORPTION PROCESS IS NOT THE ONLY EFFECT TO GET RID OF THE POLLUTANT, AS THE SEDIMENTATION FACTOR DUE TO SALTS SHOWED A BIG ROLE.
THE KD FACTOR PLAYS THE LARGEST ROLE IN THE PROCESS OF GETTING RID OF THE POLLUTANT, WHILE THE ROLE OF THE POROUS VELOCITY HAS BECOME LESS DUE TO THE OVERLAP OF THE SEDIMENTATION PROCESS.
[6] Chrysikopoulos C V, Kitanidis P K and Roberts P V , Analysis of one‐dimensional solute transport through porous media with spatially variable retardation factor.
Online since: May 2022
Authors: Fan Yang, Rong Jian Pan, Zhen Wang, Hai Sheng Zhang
., but fast neutron irradiation induced brittleness is the most important factor [5-11].
And then, optical microscope (OM) is used to analyze the microstructure of the specimen with cleavage fracture, and the analysis results are compared with those of the specimen without cleavage fracture, determining the main factors causing the cleavage fracture of the specimen.
Irradiation property of pressure vessel materials in China, Materials China, 05 (2011) 7-10.
Liu, et al., Influence factors of nuclear power plant reactor pressure vessel on irradiation embirttlement, China Metallurgy, 24 (2014) 1-5.
Chen, Effects of specimen sizes on the local cleavagefracture stress of steel, Journal of Mechanical Strength, 25 (2003) 552-555.
And then, optical microscope (OM) is used to analyze the microstructure of the specimen with cleavage fracture, and the analysis results are compared with those of the specimen without cleavage fracture, determining the main factors causing the cleavage fracture of the specimen.
Irradiation property of pressure vessel materials in China, Materials China, 05 (2011) 7-10.
Liu, et al., Influence factors of nuclear power plant reactor pressure vessel on irradiation embirttlement, China Metallurgy, 24 (2014) 1-5.
Chen, Effects of specimen sizes on the local cleavagefracture stress of steel, Journal of Mechanical Strength, 25 (2003) 552-555.
Online since: February 2011
Authors: Zhao Jian Yang, Juan Li Li
Study on XML-Based Apriori Algorithm Applying to Remote Diagnosis System for Hoist
Juanli Li a, Zhaojian Yang b
1College of Mechanical Engineering, Taiyuan University of Technology,
Taiyuan, Shanxi, 030024, China
alijuanli@tyut.edu.cn, byangzhaojian@tyut.edu.cn
Keywords: XML; Data Mining; Apriori; Remote Diagnosis.
XML language is not only applicable to network but also can let information provider define the structure, properties and context of data according to the needs of the specific application.
It is import that directly affects the efficiency and accuracy of mining directly.
Steps are as follows: l Confirming the smallest support degree and confidence factor.
XML language is not only applicable to network but also can let information provider define the structure, properties and context of data according to the needs of the specific application.
It is import that directly affects the efficiency and accuracy of mining directly.
Steps are as follows: l Confirming the smallest support degree and confidence factor.
Online since: October 2014
Authors: Guo Jun Liu
Creep of concrete can significantly affect the mechanical properties of the structure or component.
According to the internal forces balance theory, Load, humidity and temperature changes in any of a factor will destroy the internal forces balance of the cement paste, it will produce drying shrinkage and creep effect.
According to the internal forces balance theory, Load, humidity and temperature changes in any of a factor will destroy the internal forces balance of the cement paste, it will produce drying shrinkage and creep effect.
Online since: August 2018
Authors: Javier Oliver, I.F. Dias, O. Lloberas-Valls
The remarkable properties of the strain injection techniques in terms of mesh independence and low computational cost have motivated the authors to extend the methodology to 3D.
Adopted Finite Element Formulation This work uses a mixed displacement/strain (/) stabilized formulation (proposed in [3]) that can be deduced from the following weak form of the mechanical problem, (1) where equations (1)(a) and (1)(b) correspond to weak forms of the equilibrium and compatibility equations, respectively, stands for the non-linear constitutive function, for the work rate produced by the external forces, and are the prescribed tractions and body forces, respectively and and are suitable test functions.
By choosing standard bi-linear interpolation functions for the displacement field and element-wise constant interpolation for the strains, in eight-noded hexahedral finite elements, and adding a consistent stabilizing term to the equations, the finite element approximation of equation (1) reads, after some mathematical manipulation (see [3]): (2) where are termed the stabilized stresses, is the stabilization factor, taken equal to 0.1, and stands for the mean value of over the finite element.
As it is shown in Fig. 4, the results obtained with the standard formulation are clearly affected by the mesh orientation, since the localization band follows de mesh alignment.
Adopted Finite Element Formulation This work uses a mixed displacement/strain (/) stabilized formulation (proposed in [3]) that can be deduced from the following weak form of the mechanical problem, (1) where equations (1)(a) and (1)(b) correspond to weak forms of the equilibrium and compatibility equations, respectively, stands for the non-linear constitutive function, for the work rate produced by the external forces, and are the prescribed tractions and body forces, respectively and and are suitable test functions.
By choosing standard bi-linear interpolation functions for the displacement field and element-wise constant interpolation for the strains, in eight-noded hexahedral finite elements, and adding a consistent stabilizing term to the equations, the finite element approximation of equation (1) reads, after some mathematical manipulation (see [3]): (2) where are termed the stabilized stresses, is the stabilization factor, taken equal to 0.1, and stands for the mean value of over the finite element.
As it is shown in Fig. 4, the results obtained with the standard formulation are clearly affected by the mesh orientation, since the localization band follows de mesh alignment.
Online since: December 2010
Authors: Xing Hua Wang, Min Zhang, You Wang
Meanwhile, due to existence of the building, its weight and stiffness also affected the movement of soil and strata surrounding grouting.
Grouting-soil-building interaction should be analyzed taken many factors into account, such as the regional distribution of grout diffusion, deformation amount of strata and rock mass characteristics of the grouting region.
It is difficult to create stress and deformation equations of in theory depended on these factors on this problem.
The main factors effects on lateral deformation are the stiffness and thickness of preventing-grout wall.
The reason resulted in the difference is that the factors of grout diffusion range, the strata expansion deformation and the upper structure forms so on are difficult to accurately quantify due to the underground concealed of strata grouting.
Grouting-soil-building interaction should be analyzed taken many factors into account, such as the regional distribution of grout diffusion, deformation amount of strata and rock mass characteristics of the grouting region.
It is difficult to create stress and deformation equations of in theory depended on these factors on this problem.
The main factors effects on lateral deformation are the stiffness and thickness of preventing-grout wall.
The reason resulted in the difference is that the factors of grout diffusion range, the strata expansion deformation and the upper structure forms so on are difficult to accurately quantify due to the underground concealed of strata grouting.
Online since: March 2008
Authors: Ivo Stloukal, Jiří Čermák, B. David, Lubomir Král
Somewhat more detailed information on the H location can be found in [33]: A square planar order of H atoms in the complex implies metallic properties, whereas regular tetrahedron leads to semiconductor-like character of the compound (for step-like changes of electric conductivity – see also in [30]).
The ratio of LT1/LT2 depends sensitively on the thermo-mechanical history of the sample and, it influences, to a certain extent, the electrical conductivity and the color of the LT [30].
Pressure of hydrogen, p, is understood as a factor that affects the kinetics of the C/D processes.
Another principal factor influencing the reliability of obtained values of D is a proper choice of the particle size, r.
Considering both the factors, the typical experimental error was estimated and shown in Fig. 22 as an abscissa.
The ratio of LT1/LT2 depends sensitively on the thermo-mechanical history of the sample and, it influences, to a certain extent, the electrical conductivity and the color of the LT [30].
Pressure of hydrogen, p, is understood as a factor that affects the kinetics of the C/D processes.
Another principal factor influencing the reliability of obtained values of D is a proper choice of the particle size, r.
Considering both the factors, the typical experimental error was estimated and shown in Fig. 22 as an abscissa.