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Online since: October 2014
Authors: Seong Soo Hong, Man Sig Lee, Ji Sun Kim, Jae Ho Baek, Myung Hwan Kim
The synthesis of Pd/C catalyst was affected various characteristic of carbon apart from high specific surface area.
Not only high specific surface area, but also surface chemical properties such as surface oxygen groups and physical properties such as the pore structure of the carbon support may influence the characteristics of carbon-supported catalysts.
Much still needs to be done to explore the physical properties of carbon supports in order to obtain optimum catalyst [11].
And we confirmed that the effects of the support physical properties such as pore distribution and preparation conditions of Pd/C catalysts on their catalytic properties have been investigated.
The micropore properties were analyzed by the t-plot and HK method.
Not only high specific surface area, but also surface chemical properties such as surface oxygen groups and physical properties such as the pore structure of the carbon support may influence the characteristics of carbon-supported catalysts.
Much still needs to be done to explore the physical properties of carbon supports in order to obtain optimum catalyst [11].
And we confirmed that the effects of the support physical properties such as pore distribution and preparation conditions of Pd/C catalysts on their catalytic properties have been investigated.
The micropore properties were analyzed by the t-plot and HK method.
Online since: November 2011
Authors: Jian Hua Zu, Min Xia, Fu Xia Shi, Rui Qin Liu
The radiation dose is an important factor to grafting yield, because it directly affects the amount of radicals produced by radiation.
Extortionate radiation dose would cause the degradation of ETFE membranes and influence the mechanical properties such as elongation and tension [4].
Extortionate radiation dose would cause the degradation of ETFE membranes and influence the mechanical properties such as elongation and tension [4].
Online since: December 2013
Authors: Jing Zhang, Hui Li
Introduction
Many engineering structures are affected by undesirable vibrations [1].
There are a number of ways to achieve the QZS property.
In [7], QZS property is achieved by combining positive and negative stiffness, and negative stiffness is obtained by a compressed rod.
In fact, the leakage flux, reluctance and the operating point of the dispersion and so on have to be considered in order to obtain a correction factor for practical utilization.
Shin, On the design of a high-static-low-dynamic stiffness isolator using linear mechanical springs and magnets, Journal of Sound and Vibration Vol. 315 (2008), p. 712-720
There are a number of ways to achieve the QZS property.
In [7], QZS property is achieved by combining positive and negative stiffness, and negative stiffness is obtained by a compressed rod.
In fact, the leakage flux, reluctance and the operating point of the dispersion and so on have to be considered in order to obtain a correction factor for practical utilization.
Shin, On the design of a high-static-low-dynamic stiffness isolator using linear mechanical springs and magnets, Journal of Sound and Vibration Vol. 315 (2008), p. 712-720
Online since: December 2014
Authors: Yan Wei Hong
Applicable to a wider range of fields, because it is compared with the traditional neural network control technology, there is a new technology to its unique properties of neural networks can theoretically be any linear mapping can be an effective way to solve the non-linear complex system modeling, forecasting and other issues.
And fault-tolerant neural network is relatively strong, even if part of the neural network does not work, it will not affect the final calculation of the situation.
Learning BP neural network is composed of two back-propagation process forward propagation and error signal composed in the forward propagation, input samples from the input signal into the network layer, and finally sent to the output layer through the hidden layer processing, if the output does not match the expectations, put the back-propagation errors, according to changes in the above weight adjustment factor to adjust the weights until the output of the output layer of the network to meet the requirement.
Patra: Mechanical Systems and Signal Processing, Vol.21 (2007), p.466-479 [5] O.
And fault-tolerant neural network is relatively strong, even if part of the neural network does not work, it will not affect the final calculation of the situation.
Learning BP neural network is composed of two back-propagation process forward propagation and error signal composed in the forward propagation, input samples from the input signal into the network layer, and finally sent to the output layer through the hidden layer processing, if the output does not match the expectations, put the back-propagation errors, according to changes in the above weight adjustment factor to adjust the weights until the output of the output layer of the network to meet the requirement.
Patra: Mechanical Systems and Signal Processing, Vol.21 (2007), p.466-479 [5] O.
Online since: November 2011
Authors: Qiang Huang, Hong Bing Xin
Interaction and Coupling of Robot
Hongbing XIN1,2,a,c and Qiang HUANG1,b
1 Department of Mechatronics, Beijing Institute of Technology, Beijing, China
2 College of Mechanical Engineering, Beijing Technology and Business University, Beijing, China
axinhongbing@bit.edu.cn, bqhuang@bit.edu.cn, cxinhb@btbu.edu.cn
Keywords.
Robot interaction includes the interaction between robots and that between robot and people, it is related to the factor of robot sociality, and affects the degree of robot integration into human society.
Inheritance technology can extend and modify the behavior of the original base class, by means of inheritance to achieve the public and unique properties of different robot models.
Robot interaction includes the interaction between robots and that between robot and people, it is related to the factor of robot sociality, and affects the degree of robot integration into human society.
Inheritance technology can extend and modify the behavior of the original base class, by means of inheritance to achieve the public and unique properties of different robot models.
Online since: January 2005
Authors: Eiichi Sato, Koichi Kitazono
Though the melt routes is capable to produce a
large metal foam ingot at relatively low cost, there is little room for improving mechanical
properties by adding alloying elements or dispersing strengthening particles because of their narrow
foaming and solidification conditions.
These results indicate that the dispersion of the TiH2 particles which affects final cell Fig. 3 Porosities of 4 kinds of specimens foamed under various foaming temperatures. morphology is nearly saturated over three ARB cycles.
These results indicate that ARB processing condition is quite important factor for the present bulk foaming process.
These results indicate that the dispersion of the TiH2 particles which affects final cell Fig. 3 Porosities of 4 kinds of specimens foamed under various foaming temperatures. morphology is nearly saturated over three ARB cycles.
These results indicate that ARB processing condition is quite important factor for the present bulk foaming process.
Online since: September 2013
Authors: Ge Luo, Chun Mei Yang, Xin Bo Jiang, Quan Hui Wu, Feng Ming Jing
Gantry Beam Stress and Strain Analysis
On the gantry beam with ANSYS finite element analysis, you can quickly get accurate results, and easily understand the various parts of the gantry stress state and deformation, this analysis method is widely recognized and the used for the mechanical design, with good technical and economic benefits [2-5].
In the modeling process, removing some elements do not affect the results, such as mounting holes, chamfers, etc., the model was appropriate simplification, ease of finite element analysis.
Since gantry beam is welded assemblies, their model uses SOLID95 unit to mesh freely, shown in Fig. 2, defined material properties is usedQ235 (plain carbon steel), the corresponding parameter is the elastic modulus E = 2.06E5MPa, Poisson's ratio μ = 0.3, density ρ = 7850 Kg/m³.
(2) Stress Analysis: Material failure is caused by a lack of strength, the material of the gantry beam is used steel Q235, safety factor of the strength of the material is taken 1.48 by empirical data, the yield limit of 235MPa, so the maximum allowable stress is = 160MPa, from Fig. 5-12 gantry beam stress cloud it can be seen that the maximum stress value of the gantry beam is 2.643MPa, less than the allowable stress 160MPa, therefore, intensity of damage of the gantry beam does not occur, meeting the strength requirements .
In the modeling process, removing some elements do not affect the results, such as mounting holes, chamfers, etc., the model was appropriate simplification, ease of finite element analysis.
Since gantry beam is welded assemblies, their model uses SOLID95 unit to mesh freely, shown in Fig. 2, defined material properties is usedQ235 (plain carbon steel), the corresponding parameter is the elastic modulus E = 2.06E5MPa, Poisson's ratio μ = 0.3, density ρ = 7850 Kg/m³.
(2) Stress Analysis: Material failure is caused by a lack of strength, the material of the gantry beam is used steel Q235, safety factor of the strength of the material is taken 1.48 by empirical data, the yield limit of 235MPa, so the maximum allowable stress is = 160MPa, from Fig. 5-12 gantry beam stress cloud it can be seen that the maximum stress value of the gantry beam is 2.643MPa, less than the allowable stress 160MPa, therefore, intensity of damage of the gantry beam does not occur, meeting the strength requirements .
Online since: October 2011
Authors: Ying Guang Fang, Bo Wu, Zong Xue Yan
According to the mechanical parameters in table 1, maximum tension strain of this surrounding rock was set at 0.5‰.
Table 1 Mechanical parameter of rock Rock grade Weight γ(kN/m3) shear modulus(GPa) Poisson ratioμ cohesive strength c/KPa internal friction angle / ° V 20 1.875 0.333 500 32 The scale of laxity area on surrounding rock is the key factor affecting surrounding rock load.
[12]GENG Luanfeng,Analysis of mechanical properties of full section excavation of single arch four-lane highway tunnel[J], Shanxi Architecture,2009.2
Table 1 Mechanical parameter of rock Rock grade Weight γ(kN/m3) shear modulus(GPa) Poisson ratioμ cohesive strength c/KPa internal friction angle / ° V 20 1.875 0.333 500 32 The scale of laxity area on surrounding rock is the key factor affecting surrounding rock load.
[12]GENG Luanfeng,Analysis of mechanical properties of full section excavation of single arch four-lane highway tunnel[J], Shanxi Architecture,2009.2
Online since: June 2014
Authors: Rustam Kaibyshev, Sergey Malopheyev
Mechanisms of dynamic recrystallization in aluminum alloys
Rustam Kaibyshev1,a,*, Sergey Malopheyev1,b
1Laboratory of Mechanical Properties of Nanostructural Materials and Superalloys, Belgorod State University, Pobeda 85, Belgorod 308015, Russia
arustam_kaibyshev@bsu.edu.ru, bmalofeev@bsu.edu.ru
Keywords: aluminum alloys, thermomechanical processing, ultrafine grained structure, severe plastic deformation
Abstract.
Temperature, deformation process and distribution of secondary phases strongly affect the CDRX mechanism.
The rate of the dynamic grain refinement is controlled by CDRX mechanism that, in turn, is strongly affected by the phase composition of aluminum alloys and the deformation temperature [7,10,14].
Therefore, under cold working the deformation technique is the main factor providing the formation of a granular structure instead of a lamellar one.
The chosen deformation technique, deformation conditions and the chemical composition of aluminum alloys highly affect the process of grain refinement through their influence on the mechanism of CDRX.
Temperature, deformation process and distribution of secondary phases strongly affect the CDRX mechanism.
The rate of the dynamic grain refinement is controlled by CDRX mechanism that, in turn, is strongly affected by the phase composition of aluminum alloys and the deformation temperature [7,10,14].
Therefore, under cold working the deformation technique is the main factor providing the formation of a granular structure instead of a lamellar one.
The chosen deformation technique, deformation conditions and the chemical composition of aluminum alloys highly affect the process of grain refinement through their influence on the mechanism of CDRX.
Online since: November 2018
Authors: G.C. Dash, Kharabela Swain, Sampada Kumar Parida
It may affect the particle deposition rate in electronic devices.
Inclusion of these terms not only generalize the earlier studies but also justify the real world problem accounting for the thermal energy due to external body forces such as electromagnetic force and internal resistive forces due to viscosity, affecting the momentum transport and hence the flow model.
Flow Stability In addition to free stream turbulence which has an adverse effect on the stability of laminar flow past a flat plate, other factors affecting transition from laminar flow to a turbulence are: (a) For the accelerated flow the critical Reynolds number , increases, whereas for retarded flow , decreases.
Further, Table 2 reveals that all the physical parameters affect the heat and mass fluxes at the plate surface in the same way except the destructive chemical reaction parameter, which affects adversely to enhance the rate of heat transfer and to decrease the mass transfer rate.
Enhancing thermal conductivity of fluids with nanoparticles, in: The Proceedings of the 1995 ASME International Mechanical Engineering Congress and Exposition, San Francisco, USA, AMSE, FED 231/MD, 66, (1995)
Inclusion of these terms not only generalize the earlier studies but also justify the real world problem accounting for the thermal energy due to external body forces such as electromagnetic force and internal resistive forces due to viscosity, affecting the momentum transport and hence the flow model.
Flow Stability In addition to free stream turbulence which has an adverse effect on the stability of laminar flow past a flat plate, other factors affecting transition from laminar flow to a turbulence are: (a) For the accelerated flow the critical Reynolds number , increases, whereas for retarded flow , decreases.
Further, Table 2 reveals that all the physical parameters affect the heat and mass fluxes at the plate surface in the same way except the destructive chemical reaction parameter, which affects adversely to enhance the rate of heat transfer and to decrease the mass transfer rate.
Enhancing thermal conductivity of fluids with nanoparticles, in: The Proceedings of the 1995 ASME International Mechanical Engineering Congress and Exposition, San Francisco, USA, AMSE, FED 231/MD, 66, (1995)