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Online since: September 2013
Authors: Xin Yi Gu
To comfort people, mechanical energy is used for excretioning indoor heat to outdoor which also increases the thermal emissions.
The integrated urban space system that constituted by “soft underlying surface” influence city underlying surface climate which is the dominant factor that affecting urban microclimate.
The mode and intensity of urban “wind-heat” movement are affected by factors of spatial scale, space layout, space penetrating and penetrating orientation [5].
“Cold Bridge” concept in building physics means a channel for thermal energy exchange caused by factors with different thermal conductivity coefficients.
Considering wide-domain property of climate change, thus objection should start from large area and combine with urban-rural environmental ecological construction.
The integrated urban space system that constituted by “soft underlying surface” influence city underlying surface climate which is the dominant factor that affecting urban microclimate.
The mode and intensity of urban “wind-heat” movement are affected by factors of spatial scale, space layout, space penetrating and penetrating orientation [5].
“Cold Bridge” concept in building physics means a channel for thermal energy exchange caused by factors with different thermal conductivity coefficients.
Considering wide-domain property of climate change, thus objection should start from large area and combine with urban-rural environmental ecological construction.
Online since: December 2003
Authors: L. Di Silvio, Cristian Rey, S. Cazalbou, Christèle Combes, Rodolfo Quarto, Roberta Martinetti, L. Dolcini, C. Bastié, G. Chatainier, N. Theilgaard, N. Svendsen, J. Hamblin, G. Stewart, N. Gurav, S. Overgaard, B. Zippor, A. Lamure
The change in surface composition and physical properties can interfere
with the sintering process as well as with the biological behaviour of the ceramics and a special
effort should be made to control these events at all levels from processing to handling, storage and
packaging.
However, ceramic processing often alters the location of trace elements inside crystals, at grain boundaries or on the surface of ceramics, thus affecting their biological behaviour.
The atomic ratios of the elements analysed were determined using the Scofield sensitivity factors.
The role of these impurities in the mechanical properties of the ceramics and their degradation in vivo, have yet to be studied.
Volatile organic components may be found in any place and have various sources, the gathering of these substances on the surface of ceramics is related to their surface properties and seems to be favoured on HA compared to biphasic surfaces.
However, ceramic processing often alters the location of trace elements inside crystals, at grain boundaries or on the surface of ceramics, thus affecting their biological behaviour.
The atomic ratios of the elements analysed were determined using the Scofield sensitivity factors.
The role of these impurities in the mechanical properties of the ceramics and their degradation in vivo, have yet to be studied.
Volatile organic components may be found in any place and have various sources, the gathering of these substances on the surface of ceramics is related to their surface properties and seems to be favoured on HA compared to biphasic surfaces.
Online since: April 2015
Authors: Mhamed Itmi, Abdelkhalak El Hami, Norelislam El Hami
However, the optimization reduces the structural cost taking into account uncertainties concerning material properties, geometric dimension and loading.
In Deterministic Design Optimization (DDO), the system safety may be taken into account by assigning safety factors to certain structural parameters.
Suitable geometry, material properties and loads are assumed, and an analysis is then performed to provide a detailed behavior of the structure.
Low reliability level: when choosing small values of safety factors or bad distribution of these factors, the structural reliability level may be too low to be admissible.
In the structural analysis of engineering design, there exist uncertainties in loading, material properties, geometry, and environmental conditions.
In Deterministic Design Optimization (DDO), the system safety may be taken into account by assigning safety factors to certain structural parameters.
Suitable geometry, material properties and loads are assumed, and an analysis is then performed to provide a detailed behavior of the structure.
Low reliability level: when choosing small values of safety factors or bad distribution of these factors, the structural reliability level may be too low to be admissible.
In the structural analysis of engineering design, there exist uncertainties in loading, material properties, geometry, and environmental conditions.
Online since: February 2018
Authors: Zhong Wen Sima, Hun Guo, Zhi Yong Li, Hong Bin Cui
reagents
content (g/L)
process parameters
Values
CuSO4·5H2O
220 g/L
ZrO2 dosage
10,20,30,40,70(g/L)
H3BO3
40 g/L
average current density
2,4,6,8,10(A/dm2)
H2SO4
60g/L
duty cycle
0.2,0.4,0.6,0.8
C12H25SO3Na
0.05g/L
pulse frequency
100,300,700,1100,2000(Hz)
The reagents used in experiments are AR, deionized water is used to configure the electroforming solution for reducing the influence of the impurity factors.
And as shown in Fig.8, the images of Cu-ZrO2 alloy deposits were affected significantly by frequency.
Corresponding author: Li Zhiyong, School of Mechanical Engineering, Shandong University of Technology.
Guo, et al., Microstructure and properties of N-i Co/nano-Al2O3 composite coatings by pulse reversal current electrodeposition, Applied Surface Science, 253(2006): 2132-2137
Branger, Effects of ultrasonic irradiation on the properties of coatings obtained by electroless plating and electro plating, Ultrasonics Sonochemistry. 12(2004)(1-2): 9- 13.
And as shown in Fig.8, the images of Cu-ZrO2 alloy deposits were affected significantly by frequency.
Corresponding author: Li Zhiyong, School of Mechanical Engineering, Shandong University of Technology.
Guo, et al., Microstructure and properties of N-i Co/nano-Al2O3 composite coatings by pulse reversal current electrodeposition, Applied Surface Science, 253(2006): 2132-2137
Branger, Effects of ultrasonic irradiation on the properties of coatings obtained by electroless plating and electro plating, Ultrasonics Sonochemistry. 12(2004)(1-2): 9- 13.
Online since: June 2007
Authors: Hyung Ryul Yang, Ki Seop Cho, Ho Sup Sim, Kon Bae Lee, Hoon Kwon
In the API X65 steel, effects of rolling and cooling conditions on microstructure and
mechanical properties were studied.
In this study, the effect of the multipass severe rolling on microstructure and mechanical properties has been analyzed in terms of rolling and cooling processes in the API X65 steel, which is a typical low carbon microalloyed steel widely used.
Results and Discussion Fig. 1 shows tensile properties.
Fig. 1 - Tensile properties with rolling and Fig. 2 - Tensile flow curves with cooling cooling conditions.
Thus, reduction of separation cracking is a significant factor in improving the impact toughness.
In this study, the effect of the multipass severe rolling on microstructure and mechanical properties has been analyzed in terms of rolling and cooling processes in the API X65 steel, which is a typical low carbon microalloyed steel widely used.
Results and Discussion Fig. 1 shows tensile properties.
Fig. 1 - Tensile properties with rolling and Fig. 2 - Tensile flow curves with cooling cooling conditions.
Thus, reduction of separation cracking is a significant factor in improving the impact toughness.
Online since: April 2011
Authors: Bin Huang, Xian Ying Zeng
This experiment, based on the actual project example of Da-Liu Expressway, makes full use of such methods as in-site investigation, digital photographing, in-situ direct shear test of earth-rock aggregate to make deeply research on the mechanical properties of earth-rock aggregate under the condition of shear.
This kind of mechanical properties change of gravel soils makes the stability of slope change, which is out of the consideration of all methods for the slope stability.
We can see that wet and dry cycles will directly affect the shear strength and composition of stone, which inevitably makes soil gravel slope stability change.
When the earth-rock aggregate yields, its features of deformation mainly shows the material properties of soil or rock itself, that is, soil’s yield at first; however, the residual strength of the earth-rock aggregate has no significant decrease, showing distinct features of plastic flow .
(5) Through this experiment, we found that the attenuation law of shear strength with various factors.
This kind of mechanical properties change of gravel soils makes the stability of slope change, which is out of the consideration of all methods for the slope stability.
We can see that wet and dry cycles will directly affect the shear strength and composition of stone, which inevitably makes soil gravel slope stability change.
When the earth-rock aggregate yields, its features of deformation mainly shows the material properties of soil or rock itself, that is, soil’s yield at first; however, the residual strength of the earth-rock aggregate has no significant decrease, showing distinct features of plastic flow .
(5) Through this experiment, we found that the attenuation law of shear strength with various factors.
Online since: July 2021
Authors: Valentina Loganina, Roman Fediuk, Daniil Taranov, Y.H. Mugahed Amran
However, even in this case, the internal stresses in the coating, if they do not relax during or immediately after the formation of the coatings, negatively affect the ability of the coatings to resist external destructive factors [9].
It should also be noted that the properties of protective and decorative coatings are heterogeneous along the strike.
The determination of the tensile strength and deformation properties (cohesive strength) of paint coatings was carried out according to the Russian standard GOST 18299-72 on an IR 5057-50 tensile testing machine.
Conclusions The exclusion of the cohesive nature of destruction creates the prerequisites in combination with the materials science factors for the creation of crack-resistant coatings.
Gorchakov, L.P.Orentlicher, V.I.Savin et al, Composition, structure and properties of cement concretes, Moscow, Stroyizdat (1976). 144 p
It should also be noted that the properties of protective and decorative coatings are heterogeneous along the strike.
The determination of the tensile strength and deformation properties (cohesive strength) of paint coatings was carried out according to the Russian standard GOST 18299-72 on an IR 5057-50 tensile testing machine.
Conclusions The exclusion of the cohesive nature of destruction creates the prerequisites in combination with the materials science factors for the creation of crack-resistant coatings.
Gorchakov, L.P.Orentlicher, V.I.Savin et al, Composition, structure and properties of cement concretes, Moscow, Stroyizdat (1976). 144 p
Online since: December 2012
Authors: Biao Chu, Chang An Zhu, Yi Jin
Meanwhile, a numerical simulation based on the Pro/ENGINEER software was conducted in order to study the relationship between stick slip behavior and its impact factors, such as the mass, stiffness, friction coefficient and damping coefficient.
Also, computer simulation is carried out to prove the relationship between the different factors according to the equations derived.
Above-mentioned analysis demonstrates the existence of the relationship between the stick slip behavior and its factors in theory.
Fig. 2 The virtual prototype of positioning stage In the module named “Mechanism”, objects on the guide, spring and damper between them are contained given separate properties.
Afterwards, numerical simulations of the mechanical system based on the CAE technology are taken which have proved the correction of the theoretical analysis.
Also, computer simulation is carried out to prove the relationship between the different factors according to the equations derived.
Above-mentioned analysis demonstrates the existence of the relationship between the stick slip behavior and its factors in theory.
Fig. 2 The virtual prototype of positioning stage In the module named “Mechanism”, objects on the guide, spring and damper between them are contained given separate properties.
Afterwards, numerical simulations of the mechanical system based on the CAE technology are taken which have proved the correction of the theoretical analysis.
Online since: August 2010
Authors: Chang He Li, Yong Yang, Fa Zhan Yang
Introduction
Ti6Al4V alloy has been regarded as crucial material of modern aerospace industry because of its
excellent mechanical properties [1].
However, the main factors that causes monolithic component distortion is redistribution of residual stress during material removal and low rigidity of workpiece.
The Johnson-Cook material law is established with the help of high strain rate mechanical experiment using the SHPB method.
Because the acting spot of cutting loads is local and the affected region is very small, based on theory of SWINAN, it is equivalent that the loads on arc li are applied on arc li1 and li2 .
Sun: Chinese Journal of mechanical engineering Vol. 68-71 (2005), p. 117-122 (In Chinese) [5] Z.J.
However, the main factors that causes monolithic component distortion is redistribution of residual stress during material removal and low rigidity of workpiece.
The Johnson-Cook material law is established with the help of high strain rate mechanical experiment using the SHPB method.
Because the acting spot of cutting loads is local and the affected region is very small, based on theory of SWINAN, it is equivalent that the loads on arc li are applied on arc li1 and li2 .
Sun: Chinese Journal of mechanical engineering Vol. 68-71 (2005), p. 117-122 (In Chinese) [5] Z.J.
Online since: December 2011
Authors: Yan Fen Liao, Xiao Qian Ma, Yan Xu
A simplified mechanical model in view of concrete component stability problem on fire was established.
To improve the ability of fire resistance of concrete structures, a lot of experimental researches about concrete structures have been carried out at home and abroad, which have provided a solid fire-resistant data base, such as mechanical properties of concrete materials at high temperature, high temperature deformation, high temperature compression strength, high temperature compression deformation, stress - strain curves and other high-temperature properties [2][3].
Obviously, the concrete component high-temperature instability caused by the change of material properties actually is a nonlinear mutation process of inner energy due to the work of the load and temperature.
So the main factor was temperature for K when km was stationary.
So the system balance was affected by fire duration, temperature, load and load characteristic.
To improve the ability of fire resistance of concrete structures, a lot of experimental researches about concrete structures have been carried out at home and abroad, which have provided a solid fire-resistant data base, such as mechanical properties of concrete materials at high temperature, high temperature deformation, high temperature compression strength, high temperature compression deformation, stress - strain curves and other high-temperature properties [2][3].
Obviously, the concrete component high-temperature instability caused by the change of material properties actually is a nonlinear mutation process of inner energy due to the work of the load and temperature.
So the main factor was temperature for K when km was stationary.
So the system balance was affected by fire duration, temperature, load and load characteristic.