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Online since: December 2011
Authors: Djamel Bradai, Hiba Azzeddine
Introduction
Magnesium alloys containing both neodymium and yttrium are interesting as light structural materials with high strength properties at near room and elevated temperatures.
It has been reported that WE54 (Mg-Y-Nd-Zr) alloy exhibit isotropic behaviour, while other Mg-based alloys such as AZ31 exhibit an asymmetry of tensile and compressive properties.
Hence the deformation and recrystallisation mechanisms may be considered as key factors in an attempted explanation of the texture-randomizing of RE elements.
The precipitation developed during the thermo-mechanical processing similarly to that already observed in Mg-Gd-Zn-Zr alloy [10].
Upon subsequent recrystallisation at 450°C, the texture is much weaker, but not randomized, and grain size was not significantly affected.
It has been reported that WE54 (Mg-Y-Nd-Zr) alloy exhibit isotropic behaviour, while other Mg-based alloys such as AZ31 exhibit an asymmetry of tensile and compressive properties.
Hence the deformation and recrystallisation mechanisms may be considered as key factors in an attempted explanation of the texture-randomizing of RE elements.
The precipitation developed during the thermo-mechanical processing similarly to that already observed in Mg-Gd-Zn-Zr alloy [10].
Upon subsequent recrystallisation at 450°C, the texture is much weaker, but not randomized, and grain size was not significantly affected.
Online since: January 2015
Authors: Hong Wei Xu, De Gang Wen, Bang Li Liu, Hang Zhang
Chen et al.[8] analyze the factors that affect the stability and bearing capacity of scaffold based on the mechanical characteristics analysis.
The two door-type frame structures are analyzed using the elastic FE model of ANSYS software with strength and stiffness properties.
Through the elastic FE models of two structures are founded and the strength and stiffness properties are analyzed using ANSYS software.
[8] Yongrui Chen, Laijun Liu, Yongcan Duan, Study on the mechanical characteristic and safety measures of bowl-scaffold, J. 13th COTA International Conference of Transportation Professionals (CICTP 2013)
The two door-type frame structures are analyzed using the elastic FE model of ANSYS software with strength and stiffness properties.
Through the elastic FE models of two structures are founded and the strength and stiffness properties are analyzed using ANSYS software.
[8] Yongrui Chen, Laijun Liu, Yongcan Duan, Study on the mechanical characteristic and safety measures of bowl-scaffold, J. 13th COTA International Conference of Transportation Professionals (CICTP 2013)
Online since: March 2011
Authors: Dong Mei Zhu, Guo Yong Liu, Shao Jun Zhang
Under medium impact wear condition, the material has obvious advantages, and the mechanical properties are also good[3].
According to some scholars[4-5], the internal factors of causing steel warpage are phase transition, yield stress and thermal conductivity.
The thermal properties change with temperature.
So the relationship of thermal properties and temperature must be considered.
(In Chinese) [7] Z.TAN and G.W.GUO: Engineering Alloy Thermal Properties(Metallurgical Industry Press, China 1994).
According to some scholars[4-5], the internal factors of causing steel warpage are phase transition, yield stress and thermal conductivity.
The thermal properties change with temperature.
So the relationship of thermal properties and temperature must be considered.
(In Chinese) [7] Z.TAN and G.W.GUO: Engineering Alloy Thermal Properties(Metallurgical Industry Press, China 1994).
The Possibilities of the Utilization of Waste Glass as Partial Replacement of Fine Aggregate for HPC
Online since: February 2018
Authors: Tomáš Vlach, Tereza Pavlů, Jakub Řepka
These all factors suggested the potential of its utilization as an alternative supplementary cementing material in concrete [2].
These aspects positively affects the properties of concrete [12].
The composition and usual mechanical properties of HPC mixture.
Kim, “Studies on mechanical properties of concrete containing waste glass aggregate,” Cem.
Broukalová, “Mechanical Properties of Cement Composites with Alternative Binders,” Adv.
These aspects positively affects the properties of concrete [12].
The composition and usual mechanical properties of HPC mixture.
Kim, “Studies on mechanical properties of concrete containing waste glass aggregate,” Cem.
Broukalová, “Mechanical Properties of Cement Composites with Alternative Binders,” Adv.
Online since: October 2004
Authors: Wing Bun Lee, Suet To
It helps to provide a scientific
framework to understand the design and processing of materials on the micro-scale to achieve the
macroscopic properties.
Prediction of Limit Strains in Sheet Metal Forming Due to the small deformation zone, material anisotropy as manifested by the effect of grain orientation affect the flow stress, ductility and the forming limit of the microparts.
The factor f is related to the type of orientations present in region A and region B.
Crystallographic factors such as crystal orientation and dislocation slip have to be taken into account Most of the studies on shear angle theories are associated with work on conventional cutting.
Fig. 4 Variation of effective Taylor factor with shear angles.
Prediction of Limit Strains in Sheet Metal Forming Due to the small deformation zone, material anisotropy as manifested by the effect of grain orientation affect the flow stress, ductility and the forming limit of the microparts.
The factor f is related to the type of orientations present in region A and region B.
Crystallographic factors such as crystal orientation and dislocation slip have to be taken into account Most of the studies on shear angle theories are associated with work on conventional cutting.
Fig. 4 Variation of effective Taylor factor with shear angles.
Online since: February 2025
Authors: Baraka Kichonge, Vicent Marwa, Juma Rajabu Selemani, Thomas Kivevele
Elevated temperatures can hasten undesirable changes in vaccine properties, foster the growth of harmful bacteria, and ultimately reduce product shelf life [12].
They consider the natural heat transfer from outside factors and heat conduction within the insulation material.
The main factors influencing the choice of mesh size are the type of structure being evaluated and the scope of the study.
It was important to note that using only solar power brings variability to the experimental setup, possibly affecting the reproducibility and generalizability of the results.
Kose, “Phase change materials: types, properties and applications in buildings,” vol. 1, pp. 190–210, 2022, doi: 10.34186/klujes.1126167
They consider the natural heat transfer from outside factors and heat conduction within the insulation material.
The main factors influencing the choice of mesh size are the type of structure being evaluated and the scope of the study.
It was important to note that using only solar power brings variability to the experimental setup, possibly affecting the reproducibility and generalizability of the results.
Kose, “Phase change materials: types, properties and applications in buildings,” vol. 1, pp. 190–210, 2022, doi: 10.34186/klujes.1126167
Online since: March 2012
Authors: You Wang Hu, Ji Wen Xiang, Xiao Yan Sun
In order to improve the performance of Love wave sensor, the theoretical relationship of TCF on substrates and guiding layers temperature properties is researched.
Effective sensitivity of Love wave sensor is affected by temperature.
Practically such a reference setup can reduce the TCF by a factor ten or higher.
Firstly, we probed into the relationship between TCF and temperature properties of substrate and guiding layer, and the pattern of temperature compensation.
So in this presentation we studied the pattern in which the substrate and guiding layer affect TCF of device.
Effective sensitivity of Love wave sensor is affected by temperature.
Practically such a reference setup can reduce the TCF by a factor ten or higher.
Firstly, we probed into the relationship between TCF and temperature properties of substrate and guiding layer, and the pattern of temperature compensation.
So in this presentation we studied the pattern in which the substrate and guiding layer affect TCF of device.
Online since: September 2013
Authors: Jana Kosíková, Ámos Dufka, Lenka Mészárosová
In this context, essentially important is an evaluation of concrete not only in relation to mechanical properties, but also determining the rate of its degradation by action of aggressive substances from the outside environment.
A significant problem is then redevelopment of such affected structures.
When taking a sample, contamination with the surrounding material occurs and this factor then makes identification of foreign particles and determination of their origin more difficult.
Portlandit is one of the minerals that significantly affect the binding power of set cement.
The above mentioned shows that the decrease in the mechanical properties of concrete exposed to extreme temperatures occurring by a fire is caused by the synergic action of both physical principles (i.e. destruction as a results of a “temperature shock”) and through physico-chemical processes occurring in the concrete microstructure (i.e. decomposition of concrete matrix, modification conversions in aggregate, etc.).
A significant problem is then redevelopment of such affected structures.
When taking a sample, contamination with the surrounding material occurs and this factor then makes identification of foreign particles and determination of their origin more difficult.
Portlandit is one of the minerals that significantly affect the binding power of set cement.
The above mentioned shows that the decrease in the mechanical properties of concrete exposed to extreme temperatures occurring by a fire is caused by the synergic action of both physical principles (i.e. destruction as a results of a “temperature shock”) and through physico-chemical processes occurring in the concrete microstructure (i.e. decomposition of concrete matrix, modification conversions in aggregate, etc.).
Online since: August 2014
Authors: Dong Mei Shi, Yan Qiang Jia, Chuan Bao Zhao, Bo Tao Lin
In this paper, the hydrolysis and self-assembly techniques , at room temperature, the preparation of coconut shell granular activated carbon nano- load (TiO2/GAC) TiO2 , the morphology and crystal morphology, adsorption properties and photocatalytic properties were tested and characterized.
Conclusion Studied the morphology and crystal structure of the material was prepared by SEM, XRD and other methods, and determined the amount of adsorption and catalytic properties of light, the following conclusions
Self-assembly technology and its influencing factors [J].
Preparation of nano titania gel process, a number of factors on the gel time [J].
[6] Wong Hung , thunder , Huang Weixin , etc. affect the complexing agent for the preparation of TiO2 thin films and super-hydrophilic characteristics [J].
Conclusion Studied the morphology and crystal structure of the material was prepared by SEM, XRD and other methods, and determined the amount of adsorption and catalytic properties of light, the following conclusions
Self-assembly technology and its influencing factors [J].
Preparation of nano titania gel process, a number of factors on the gel time [J].
[6] Wong Hung , thunder , Huang Weixin , etc. affect the complexing agent for the preparation of TiO2 thin films and super-hydrophilic characteristics [J].
Online since: October 2014
Authors: Jin Kai Xu, Bing Yan Chen, Hua Dong Yu, Jin Dong Wang
Power lines and tower attachments long-term effected by mechanical tension, electrical flashover, and material aging, will produce off shares, wear, corrosion and other damage; in addition, the trees growth around the EHV transmission lines running area will lead to the width of safe passage not enough; above elements if not promptly treated and repaired, will lead to serious accidents, brings great risks to the power transmission.
Because of the special nature of the use of regional environment, UAV flight attitude diversifications, spindle vibration, air resistance and other factors, the overall structure of the pod requires sufficient strength.
The main alloy element of material is zinc, and the intensity of material can reach 572Mpa.This material has good mechanical properties and heat treatment properties, and has been widely used in the aerospace field.
Continuous vibration of UAV will affect the stability of the pod system optical visual axis, this needs higher requirements on the structural strength of the pod system.
Because of the special nature of the use of regional environment, UAV flight attitude diversifications, spindle vibration, air resistance and other factors, the overall structure of the pod requires sufficient strength.
The main alloy element of material is zinc, and the intensity of material can reach 572Mpa.This material has good mechanical properties and heat treatment properties, and has been widely used in the aerospace field.
Continuous vibration of UAV will affect the stability of the pod system optical visual axis, this needs higher requirements on the structural strength of the pod system.