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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: June 2008
Authors: Michael Josef Zehetbauer, Ruslan Valiev, Erhard Schafler, Igor V. Alexandrov, Nariman A. Enikeev
However,
the investigation and potential application of HPT was rather limited by the size factor of the output
specimens - their final dimensions typically did not exceed 10 mm in diameter and 0.1-0.3 mm in
thickness.
Also, larger dimensions of HPT samples provide new possibilities to extend the number of investigation techniques to study their microstructure and properties and open new perspectives for their possible industrial applications (for example in medicine or precision engineering).
Third, the structure of the HPT samples is reported to be pretty uniform even after first few turns and there is no considerable structural differences capable to affect texture at the investigated points.
Since the C-orientation has the highest Taylor factor among all the 5 main ideal shear orientations, C-oriented grains suggestedly possess the highest dislocation density.
Such grains have to be consumed by low dislocation density grains ( A / A - the least Taylor factor) which are assumed to be easily converted to large dislocation-free nuclei of recrystallization [22].
Also, larger dimensions of HPT samples provide new possibilities to extend the number of investigation techniques to study their microstructure and properties and open new perspectives for their possible industrial applications (for example in medicine or precision engineering).
Third, the structure of the HPT samples is reported to be pretty uniform even after first few turns and there is no considerable structural differences capable to affect texture at the investigated points.
Since the C-orientation has the highest Taylor factor among all the 5 main ideal shear orientations, C-oriented grains suggestedly possess the highest dislocation density.
Such grains have to be consumed by low dislocation density grains ( A / A - the least Taylor factor) which are assumed to be easily converted to large dislocation-free nuclei of recrystallization [22].
Online since: May 2025
Authors: Annamária Polyákné Kovács, Marcell János Tóth
This article investigated the properties and applicability of a composite containing thermoplastic starch (TPS), coffee and straw fiber.
The development of biopolymers with improved gas barrier properties and longer shelf life is improving the quality of food packaging.
Protein-based polymers exhibit unique physical and chemical properties for film/coating formation.
The thermal and mechanical properties of starch can be improved by incorporating natural fillers, thus achieving outstanding properties in biocomposites.
The biodegradability of polymers depends on several factors, the chain length or molecular weight of the polymer, the complexity of the chemical formula and the crystallinity of the polymer.
The development of biopolymers with improved gas barrier properties and longer shelf life is improving the quality of food packaging.
Protein-based polymers exhibit unique physical and chemical properties for film/coating formation.
The thermal and mechanical properties of starch can be improved by incorporating natural fillers, thus achieving outstanding properties in biocomposites.
The biodegradability of polymers depends on several factors, the chain length or molecular weight of the polymer, the complexity of the chemical formula and the crystallinity of the polymer.
Online since: January 2015
Authors: Roman Perminov, Irina Maltseva, Natalia Kaganovich, Alexander Yolohov
Total solar factor: g = 0,62 [11].
Vacuum tubes capable of performing at negative temperature and less affected by snow covering [13].
[7] STO 00044907-001-2006 Heat-insulating properties of building envelope, Russian code, ROIS, Moscow, 2006
Kwok, Mechanical and electrical equipment for buildings, Wiley, Ney York, 2014
Vacuum tubes capable of performing at negative temperature and less affected by snow covering [13].
[7] STO 00044907-001-2006 Heat-insulating properties of building envelope, Russian code, ROIS, Moscow, 2006
Kwok, Mechanical and electrical equipment for buildings, Wiley, Ney York, 2014
Online since: January 2012
Authors: Wei Shi, Jin Han, Yong Bin Li, Yuan Hao Jiang
Table 2 Geogrid specifications
Peak Load
KN/m
Elongation at peak load
%
Strength at 2%
KN/m
Strength at 5%
KN/m
94
8.80
31.38
63.33
Table 3 The main chemical components of fly ash[3]
Composition
SiO2
Al2O3
Fe2O3
CaO
MgO
SO3
Na2O
K2O
average value
50.6
27.2
7
2.8
1.2
0.3
0.5
1.3
Table 4 The physical properties index of fly ash
proportion
liquid limit
(WL)
plastic limit
(WP)
plasticity index
(IP)
particle composition
fine sand
0.25-0.075
mm
powder
0.075-0.005mm
clay
<0.005mm
2.19
38
28
6.9
5.3
70.2
23.5
Test procedure.(1)Anchor chamber with rebar.(2)Proof pressure of hydraulic jacks.(3)Mix fly ash of different moisture content.(4)Put fly ash into the chamber,adding geogrid,hierarchical compaction.(5)Moved sample to the shelf of stretching machine ,start the computer, drawing machine system,adjust the distance between fixture and geogrid,clamp the sample by fixture,computer readings (displacement, pressure) back to zero,set the drawing
speed parameters 1mm/min,uniform drawing geogrid,peak pull-out occurs,end the experiment.(6)Shed normal pressure and pulling force,remove the cover plate,plane to the surface filling, take the soil samples near the grill by cutting ring, determine the physical and mechanical experimental data of fly ash.(7)Replace the size of reinforced materials and pressure,repeat the above steps.(8)Computer automatically take the experimental data.
Fig. 5 The relationship curve between the peak pulling force and water content Table 5 Shear strength factor under different water content water content/% 10 18 25 34 friction coefficient 0.042 0.031 0.026 0.068 cohesion/kPa 9.21 9.28 9.34 7.76 Table 6 The friction coefficient between filler and reinforced body Foundation soil classification soft plastic clay hard plastic clay Loam,semi-hard clay sandy soil, gravel type soil, soft rock μ 0.25 0.30 0.30-0.40 0.40 Table 6 (specification) lists friction coefficient between any kind of fill soil and reinforced body,its value is far greater than the friction coefficient between geogrid and fly ash.This is due to fine particles of fly ash is relatively small.To increase the friction coefficient between geogrid and fly ash,add appropriate amount of gravel in the fly ash is a good measure.
Summary By drawing experiment,analysis the characteristics of interfacial interaction between geogrid and fly ash,not only plot the curve between limit drawing force and the water content but also plots the drawing force and displacement curve ,reach the following conclusions:In the same moisture content, the greater the normal stress is,the greater is the peak drawing force of geogrid; When the moisture content of fly ash does not meet the plastic limit moisture content ,moisture content affects the peak drawing force of geogrid,underthe same normal stress,the peak drawing of geogrid force decreases as the moisture content increases,but when the moisture content of fly ash near the liquid limit water content,the peak drawing force of geogrid and the interface friction coefficient between geogrid and fly ash is significantly larger.
speed parameters 1mm/min,uniform drawing geogrid,peak pull-out occurs,end the experiment.(6)Shed normal pressure and pulling force,remove the cover plate,plane to the surface filling, take the soil samples near the grill by cutting ring, determine the physical and mechanical experimental data of fly ash.(7)Replace the size of reinforced materials and pressure,repeat the above steps.(8)Computer automatically take the experimental data.
Fig. 5 The relationship curve between the peak pulling force and water content Table 5 Shear strength factor under different water content water content/% 10 18 25 34 friction coefficient 0.042 0.031 0.026 0.068 cohesion/kPa 9.21 9.28 9.34 7.76 Table 6 The friction coefficient between filler and reinforced body Foundation soil classification soft plastic clay hard plastic clay Loam,semi-hard clay sandy soil, gravel type soil, soft rock μ 0.25 0.30 0.30-0.40 0.40 Table 6 (specification) lists friction coefficient between any kind of fill soil and reinforced body,its value is far greater than the friction coefficient between geogrid and fly ash.This is due to fine particles of fly ash is relatively small.To increase the friction coefficient between geogrid and fly ash,add appropriate amount of gravel in the fly ash is a good measure.
Summary By drawing experiment,analysis the characteristics of interfacial interaction between geogrid and fly ash,not only plot the curve between limit drawing force and the water content but also plots the drawing force and displacement curve ,reach the following conclusions:In the same moisture content, the greater the normal stress is,the greater is the peak drawing force of geogrid; When the moisture content of fly ash does not meet the plastic limit moisture content ,moisture content affects the peak drawing force of geogrid,underthe same normal stress,the peak drawing of geogrid force decreases as the moisture content increases,but when the moisture content of fly ash near the liquid limit water content,the peak drawing force of geogrid and the interface friction coefficient between geogrid and fly ash is significantly larger.
Online since: June 2014
Authors: Mahvish Fatima, Muhammad Waseem, Muhammad Fakhar-E-Alam, Muhammad Afzal, Muhammad Nadeem Shakoor, Muhammad Hammad Aziz
Slightly more males (58.4%) are affected than females (41.6%) and Caucasians have a higher incidence than African Americans (rate ratio 1.2).
Fe2O3 and SiO2 are widely used in medical research especially in toxicological studies [16, 17, 18] and contain several properties that can play a dominant role on human malignant cell treatment.
Yow et al. [19] explored that ALA accumulation into liver carcinoma cellular model is depended on time factor.
Mechanical stress/trauma might be responsible due to affectivity of their shape and size which induced direct cell death, will be explored in future work.
Fe2O3 and SiO2 are widely used in medical research especially in toxicological studies [16, 17, 18] and contain several properties that can play a dominant role on human malignant cell treatment.
Yow et al. [19] explored that ALA accumulation into liver carcinoma cellular model is depended on time factor.
Mechanical stress/trauma might be responsible due to affectivity of their shape and size which induced direct cell death, will be explored in future work.
Online since: June 2014
Authors: Saber Darmoul, Sonia Hajri-Gabouj, Henri Pierreval, Nawel Bayar
This lack of assistance has detrimental consequences on the proper planning and management of HAZOP studies, which remains one of the crucial factors for better effectiveness and good reliability of the results [7; 21].
Classes (also called concepts) describe objects or things that share common properties. 3) Defining properties.
Properties are used to describe attributes of classes, and to describe relationships between classes/individuals and data values in order to describe specific requirements. 4) Creating restrictions.
Filling in specific properties in conformity with specified restrictions leads to creating a knowledge base.
Restoring nominal production process requires a significant period of time, which may affect manufacturing lead time and cause further delays with customers.
Classes (also called concepts) describe objects or things that share common properties. 3) Defining properties.
Properties are used to describe attributes of classes, and to describe relationships between classes/individuals and data values in order to describe specific requirements. 4) Creating restrictions.
Filling in specific properties in conformity with specified restrictions leads to creating a knowledge base.
Restoring nominal production process requires a significant period of time, which may affect manufacturing lead time and cause further delays with customers.
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: September 2011
Authors: Michiko Yoshihara
The alloys based on γ-TiAl have attractive properties as light weight heat-resisting material.
Introduction The alloys based on γ-TiAl have attractive properties as light weight heat-resisting material due to their low density and high strength at elevated temperatures.
Another factor leading to a poor oxidation resistance of the alloy is a scale spallation during cooling.
This may affect the scale spallation observed in TiAl based alloys with Zr, the detail is not clarified yet.
The engineering TiAl based alloy usually contains Nb to improve the mechanical properties as well as the oxidation resistance.
Introduction The alloys based on γ-TiAl have attractive properties as light weight heat-resisting material due to their low density and high strength at elevated temperatures.
Another factor leading to a poor oxidation resistance of the alloy is a scale spallation during cooling.
This may affect the scale spallation observed in TiAl based alloys with Zr, the detail is not clarified yet.
The engineering TiAl based alloy usually contains Nb to improve the mechanical properties as well as the oxidation resistance.