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Online since: June 2013
Authors: Yue Yu Tong, Yi Lan Chen, Rong Wei Pan, Jie Tang
The phase characterization of samples were examined by D / max-RB X-ray diffractometer.
2.2.2 Material affects the adsorption properties of Sr2+, Co2+ and Cs+
The static method was used to study the adsorption performance of Sr2+, Co2+ and Cs+ in geopolymers.
The adsorption rate reduced with the increasing of the proliferation resistance, so that the surface properties of adsorbents and the proliferation resistance were the key factors affecting this.
Table 2 The calculated parameters of the first-order model for Sr2+, Co2+ and Cs+ adsorbed in sample Ion qe(calc) [mg·g-1] k [min-1] R2 qe (exp) [mg·g-1] Sr2+ 85.06 0.0757 0.9957 85.68 Co2+ 57.85 0.0581 0.9954 58.76 Cs+ 112.39 0.0857 0.9992 113.26 3.2 PH affects the adsorption properties of samples Set pH as the abscissa, while adsorption amount, q(mg·g-1), as the ordinate to draw curves as figure 2.
Its diffraction patterns presented strength decreases or disappears due to Al3+, Na+ and Mg2+ replaced by heavier Co2+, Sr2+ and Cs+ in zeolite and the increasing of electrostatic interaction with silica skeleton as well as the decreasing of x-ray synthetic wave amplitude, which resulted in the decreasing of crystal structure factors.
Mechanical curing was due to dense structure of curing body which blocked the proliferation and leaching of ions.
The adsorption rate reduced with the increasing of the proliferation resistance, so that the surface properties of adsorbents and the proliferation resistance were the key factors affecting this.
Table 2 The calculated parameters of the first-order model for Sr2+, Co2+ and Cs+ adsorbed in sample Ion qe(calc) [mg·g-1] k [min-1] R2 qe (exp) [mg·g-1] Sr2+ 85.06 0.0757 0.9957 85.68 Co2+ 57.85 0.0581 0.9954 58.76 Cs+ 112.39 0.0857 0.9992 113.26 3.2 PH affects the adsorption properties of samples Set pH as the abscissa, while adsorption amount, q(mg·g-1), as the ordinate to draw curves as figure 2.
Its diffraction patterns presented strength decreases or disappears due to Al3+, Na+ and Mg2+ replaced by heavier Co2+, Sr2+ and Cs+ in zeolite and the increasing of electrostatic interaction with silica skeleton as well as the decreasing of x-ray synthetic wave amplitude, which resulted in the decreasing of crystal structure factors.
Mechanical curing was due to dense structure of curing body which blocked the proliferation and leaching of ions.
Online since: April 2020
Authors: Zhen Yu Han, Yong Deng, Da Wei Yang, Jun Yuan
Transfer characteristics of austenite grain size, microstructures and key properties of high carbon rail during the process are also revealed.
The mechanical properties of flaky pearlite are closely related to the structure of pearlite [2-4].
The main factor affecting yield strength and fracture strength toughness of flaky pearlite is the spacing of flakes, and the relationship between them can be expressed by Hall-Petch formula.
The main factors affecting the plasticity of flake pearlite are the original austenite grain size and the lamellar spacing of pearlite.
Table 4 Tensile and impact properties corresponding to different heating processes No.
The mechanical properties of flaky pearlite are closely related to the structure of pearlite [2-4].
The main factor affecting yield strength and fracture strength toughness of flaky pearlite is the spacing of flakes, and the relationship between them can be expressed by Hall-Petch formula.
The main factors affecting the plasticity of flake pearlite are the original austenite grain size and the lamellar spacing of pearlite.
Table 4 Tensile and impact properties corresponding to different heating processes No.
Online since: April 2020
Authors: Ding Zeng, Hong Yu Lu, Bao Hong Hao, Hao Zheng Yu, Yu Mi
Corrosion potential can not be used as an index for evaluating corrosion rate of reinforcement bars with different tensile stresses; Third intercrystalline corrosion occurs inside the reinforcement bar due to micro-defects after rolling and moulding, which directly affects the mechanical properties of reinforcement bar.
There were many influencing factors, and the measured data fluctuate to a certain extent, but there were still some corrosion laws in general.
These defects will seriously affect its mechanical properties, which is the main reason for the significant decline of mechanical properties, and become the internal cause of accidents in the later period.
Intercrystalline corrosion will seriously affect the mechanical properties of reinforcing bars, which is the main cause of the substantial decline in mechanical properties
[12] Wu Qing, Yuan Yingshu, Experimental study on the deterioration of mechanical properties of corroded steel bars, China civil engineering journal, Volume 41, Issue 12, (2008) 42-47
There were many influencing factors, and the measured data fluctuate to a certain extent, but there were still some corrosion laws in general.
These defects will seriously affect its mechanical properties, which is the main reason for the significant decline of mechanical properties, and become the internal cause of accidents in the later period.
Intercrystalline corrosion will seriously affect the mechanical properties of reinforcing bars, which is the main cause of the substantial decline in mechanical properties
[12] Wu Qing, Yuan Yingshu, Experimental study on the deterioration of mechanical properties of corroded steel bars, China civil engineering journal, Volume 41, Issue 12, (2008) 42-47
Online since: November 2011
Authors: Bing Shen Du, Li Ma
Geological factors.
Water factor.
The grouting pressure are affected and restricted by the surrounding rock character, pulp material performance, grouting way and the other factors.
The injection rate of slurry is influenced by many factors, such as grouting pressure, grouting time, the development degree of fractures and broken conditions of surrounding rock, permeability, etc.
Many factors affecting diffusion radius, mainly depends on the grouting pressure, the mechanical properties of surrounding rock, fracture density and aperture, the flow mechanical parameters of slurry and the initial setting time, etc.
Water factor.
The grouting pressure are affected and restricted by the surrounding rock character, pulp material performance, grouting way and the other factors.
The injection rate of slurry is influenced by many factors, such as grouting pressure, grouting time, the development degree of fractures and broken conditions of surrounding rock, permeability, etc.
Many factors affecting diffusion radius, mainly depends on the grouting pressure, the mechanical properties of surrounding rock, fracture density and aperture, the flow mechanical parameters of slurry and the initial setting time, etc.
Online since: March 2016
Authors: Wei Xia Dong, Ting Luo, Xing Yong Gu, Xin Hao Li
The formation mechanism and influence factors for mullite whiskers materials were discussed.
Introduction Due to the excellent mechanical properties, especially the high temperature mechanical properties, mullite whiskers are often used to toughen high temperature ceramic materials.
The different aluminum sources affect the properties by influencing the crystallinity, structure and densification of the samples.
Sahin, The physical and mechanical properties of alumina-based ultralow cement castable refractories, Ceramics International, 38 (2012) 4189-4194
Hildmanna, Structure and properties of mullite, Journal of the European Ceramic Society, 28 (2008) 329-344
Introduction Due to the excellent mechanical properties, especially the high temperature mechanical properties, mullite whiskers are often used to toughen high temperature ceramic materials.
The different aluminum sources affect the properties by influencing the crystallinity, structure and densification of the samples.
Sahin, The physical and mechanical properties of alumina-based ultralow cement castable refractories, Ceramics International, 38 (2012) 4189-4194
Hildmanna, Structure and properties of mullite, Journal of the European Ceramic Society, 28 (2008) 329-344
Online since: October 2007
Authors: Yun Soo Lim, Sung Soo Kim, Hye Rim Lee, Tae Wan Kim
In this study, two directional carbon fibers reinforced composites
with carbon nanotubes as fillers were studied for the high frequency electromagnetic properties and
mechanical properties.
The electromagnetic insulating properties were measured by micro strip line method in this study.
Electromagnetic interference shielding properties of composites were investigated in the frequency region of 0.3-6 GHz.
The EMI shielding efficiency of a composite material depends on many factors, including the filler's intrinsic conductivity, dielectric constant, and aspect ratio.
Fabricated CNTs Table 1 showed the properties of manufactured composites.
The electromagnetic insulating properties were measured by micro strip line method in this study.
Electromagnetic interference shielding properties of composites were investigated in the frequency region of 0.3-6 GHz.
The EMI shielding efficiency of a composite material depends on many factors, including the filler's intrinsic conductivity, dielectric constant, and aspect ratio.
Fabricated CNTs Table 1 showed the properties of manufactured composites.
Online since: January 2011
Authors: Zdeněk Knésl, Pavel Hutař, R. Lach, P. Vesely, E. Nezbedova, W. Grellmann
In has been found that the mechanical basic properties and damage kinetics are clearly depending on the welding parameters and additional notching.
The hardness and the elastic properties of the samples were determined by a recording microhardness tester Fischerscope H 100C XYp equipped with a Vickers diamond indenter at room temperature.
The degree of crystallinity is the highest inside the welded joint and the lowest inside the heat affected zones (welded joint: 56%, heat affected zones: 47%, basic material: 50%).
In the other case, when the temperature was varied, inverse trend of the mechanical properties between lower and higher temperature was obtained compared to changes of the properties induced by variation in pressure (Fig. 2b).
Especially the influence of temperature on the crystallization process in the welding zone is an important factor for final properties.
The hardness and the elastic properties of the samples were determined by a recording microhardness tester Fischerscope H 100C XYp equipped with a Vickers diamond indenter at room temperature.
The degree of crystallinity is the highest inside the welded joint and the lowest inside the heat affected zones (welded joint: 56%, heat affected zones: 47%, basic material: 50%).
In the other case, when the temperature was varied, inverse trend of the mechanical properties between lower and higher temperature was obtained compared to changes of the properties induced by variation in pressure (Fig. 2b).
Especially the influence of temperature on the crystallization process in the welding zone is an important factor for final properties.
Online since: February 2007
Authors: Jai Hak Park, Kyu In Shin
n
Kεσ= (1)
The material properties used in this study for steam generator tubes are listed in Table 1.
Generally the burst pressure from the plastic instability analysis is very sensitive to the material properties and element size and so on.
Table 1 Material properties of Inconel 600 for plastic instability analysis ysσ (MPa) utσ (MPa) K (MPa) ν n 261.0 652.0 2901.68 0.3 0.36 Second, the burst pressure is calculated for a damaged tube and the strength reduction factor is obtained from the following Eq. 2.
The discrepancy between experimental data is probably due to the differences in test methods and mechanical properties caused by different heat treatment and so on.
However the burst pressure for the Model 2 is not much affected by the increase of 2θ.
Generally the burst pressure from the plastic instability analysis is very sensitive to the material properties and element size and so on.
Table 1 Material properties of Inconel 600 for plastic instability analysis ysσ (MPa) utσ (MPa) K (MPa) ν n 261.0 652.0 2901.68 0.3 0.36 Second, the burst pressure is calculated for a damaged tube and the strength reduction factor is obtained from the following Eq. 2.
The discrepancy between experimental data is probably due to the differences in test methods and mechanical properties caused by different heat treatment and so on.
However the burst pressure for the Model 2 is not much affected by the increase of 2θ.
Online since: September 2013
Authors: Eun Sang Lee, Hon Jong Choi, Nam Kyung Kim, Woong Kirl Choi
It is not easy to analyze correlation to these factors.
Fundamental Theory of Polishing Wafer polishing is process combined mechanical factor with chemical factor.
Mechanical factors are associated with polishing pad, polishing grain and physical correlation on the wafer surface.
Robust design of Taguchi method is to minimize affects of noise by means of finding factors which have main influence.
Selected factors and levels are given in Table 2.
Fundamental Theory of Polishing Wafer polishing is process combined mechanical factor with chemical factor.
Mechanical factors are associated with polishing pad, polishing grain and physical correlation on the wafer surface.
Robust design of Taguchi method is to minimize affects of noise by means of finding factors which have main influence.
Selected factors and levels are given in Table 2.
Online since: December 2014
Authors: José Manuel Rodríguez-Fortún, Alfredo Gómez, José Alberto Roig, Raúl Monge, Pedro González
Comfort is an important topic in the elevator industry, and among the different factors which affect it, vibration in the car is one of the most important.
As alternative, the cheaper and lighter semi-active vibration systems based on passive elements capable of modifying their properties in response to external commands represent an appealing option.
Different control strategies based on low cost acceleration sensors are also analyzed. 1 INTRODUCTION Vibration is an important problem in the elevator industry, affecting, not only the perception of the user with regard to the system safety and comfort, but also and most important, the system performance and reliability, as it affects the mechanical integrity of the different elements in the elevator and it can result in failure modes caused by fatigue.
The dampers use magnetorheological fluids whose properties change due to the magnetic field by an electromagnet for changing the viscosity of the fluid and the resulting stiffness of the dampers.
However, these approaches have very low damping values due to the properties of the dampers, and also suffer from high static friction observed in Figure 1.
As alternative, the cheaper and lighter semi-active vibration systems based on passive elements capable of modifying their properties in response to external commands represent an appealing option.
Different control strategies based on low cost acceleration sensors are also analyzed. 1 INTRODUCTION Vibration is an important problem in the elevator industry, affecting, not only the perception of the user with regard to the system safety and comfort, but also and most important, the system performance and reliability, as it affects the mechanical integrity of the different elements in the elevator and it can result in failure modes caused by fatigue.
The dampers use magnetorheological fluids whose properties change due to the magnetic field by an electromagnet for changing the viscosity of the fluid and the resulting stiffness of the dampers.
However, these approaches have very low damping values due to the properties of the dampers, and also suffer from high static friction observed in Figure 1.