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Online since: February 2021
Authors: Ahmed Gaber H. Saif, Mohamed R.O. Ali, Seddik S. Wahid
Pyrolysis in a fixed-bed reactor depends on several factors affecting the bio-oil product.
The final pyrolysis temperature is the most significant of these factors.
In addition, Beis et al. [8] investigated the effect of these factors on safflower seed sample pyrolysis in a fixed-bed reactor.
Consequently, upgrading and refining the generated bio-oil are required for obtaining the desired properties.
Abdullah, "Thermogravimetric analysis of the fuel properties of empty fruit bunch briquettes," Carbon, vol. 43, p. 46.62, 2014
The final pyrolysis temperature is the most significant of these factors.
In addition, Beis et al. [8] investigated the effect of these factors on safflower seed sample pyrolysis in a fixed-bed reactor.
Consequently, upgrading and refining the generated bio-oil are required for obtaining the desired properties.
Abdullah, "Thermogravimetric analysis of the fuel properties of empty fruit bunch briquettes," Carbon, vol. 43, p. 46.62, 2014
Online since: November 2012
Authors: Jun Dong, Fei Dong, Wei Ze Sun, Yu Ping Cui
Due to this factor, a simple model could be established and investigated, as shown in Fig. 1~2.
Table 1 The physical and mechanical parameter of rock Soil property Thickness (m) density (Kg/m3) Deformation (MPa) Poisson’s ratio Internal friction angle(°) Cohesion (kPa) powder soil fill 3.0 2014 14 0.25 24.8 14 miscellaueous fill 6.2 1930 5.6 0.3 12.5 11.0 silry clay 8.0 2010 5.6 0.3 12.5 11 sand 10.0 2000 22 0.35 32 0 gravel 14.55 2220 90 0.3 45 0 The static-boundary scheme proposed by Lysmer and Kuhlemeyer (1969) involves dashpots attached independently to the boundary in the normal and shear directions.
The first one is lining of Line No.10 with or without primary defect which is said the response of line 10 lining affected by one-way vibrating loads before and after line No.7 construct, and the other one is response of line No.10 lining affected by two-way vibrating loads when the lining with or without primary defect.
The displacement spectrum at the point A affected by one-way loads is shown in Fig. 5.
The displacement in two cases are different, in other words, the two-way loads can affect each other but not so remarkable.
Table 1 The physical and mechanical parameter of rock Soil property Thickness (m) density (Kg/m3) Deformation (MPa) Poisson’s ratio Internal friction angle(°) Cohesion (kPa) powder soil fill 3.0 2014 14 0.25 24.8 14 miscellaueous fill 6.2 1930 5.6 0.3 12.5 11.0 silry clay 8.0 2010 5.6 0.3 12.5 11 sand 10.0 2000 22 0.35 32 0 gravel 14.55 2220 90 0.3 45 0 The static-boundary scheme proposed by Lysmer and Kuhlemeyer (1969) involves dashpots attached independently to the boundary in the normal and shear directions.
The first one is lining of Line No.10 with or without primary defect which is said the response of line 10 lining affected by one-way vibrating loads before and after line No.7 construct, and the other one is response of line No.10 lining affected by two-way vibrating loads when the lining with or without primary defect.
The displacement spectrum at the point A affected by one-way loads is shown in Fig. 5.
The displacement in two cases are different, in other words, the two-way loads can affect each other but not so remarkable.
Online since: August 2009
Authors: Wei Xiao Tang, L. Wang, X.D. Zhang
A New Variable Feedrate CNC Interpolator for Abrasive Waterjet System
W.Tang
1
, X.D.Zhang.
2
and L.Wang
3
1,3
School of Mechanical Engineering, Shandong University, Jinan, P.
Its capability to cut materials of different thickness depends on the choice of various process parameters and the properties of materials being cut.
After the effect of the traverse Speed on cut surface quality is reviewed briefly, the definition and properties of PH curves is presented.
Every AWJ application is affected to some extent by the deflection of the jet as it travels through the material.
Pythagorean-Hodograph Curve Given polynomials )(u and )(v without common non-constant factors and 1)deg(),deg(max vu m , a regular PH curve () ((),())xy r of degree 12 mn is defined by the hodograph: )()()( 2 2 vux (1) )()(2)( vuy (2) where is 'curve parameter '.
Its capability to cut materials of different thickness depends on the choice of various process parameters and the properties of materials being cut.
After the effect of the traverse Speed on cut surface quality is reviewed briefly, the definition and properties of PH curves is presented.
Every AWJ application is affected to some extent by the deflection of the jet as it travels through the material.
Pythagorean-Hodograph Curve Given polynomials )(u and )(v without common non-constant factors and 1)deg(),deg(max vu m , a regular PH curve () ((),())xy r of degree 12 mn is defined by the hodograph: )()()( 2 2 vux (1) )()(2)( vuy (2) where is 'curve parameter '.
Online since: November 2021
Authors: Viktor Alekseevich Kukartsev, Vladislav Viktorovich Kukartsev, Anton Sergeevich Mikhalev, Ivan Yurievich Makarchuk, Aleksandr Ivanovich Cherepanov
The main factor that determines the content of the development strategies of a modern foundry is the use of modern technological processes, especially melting technology.
This is because the melt is obtained, as a rule, using solid fuel (coke), which introduces phosphorus and sulfur into it, which reduce the mechanical properties of the castings.
All this reduces production efficiency and affects competitiveness, since the market requires not only high-quality but also attractively priced castings [9, 10].
Kukartsev, Combined method of making decision for reproduction capital reproduction funds, Problems of mechanical engineering and automation 2 (2011) 56-60
This is because the melt is obtained, as a rule, using solid fuel (coke), which introduces phosphorus and sulfur into it, which reduce the mechanical properties of the castings.
All this reduces production efficiency and affects competitiveness, since the market requires not only high-quality but also attractively priced castings [9, 10].
Kukartsev, Combined method of making decision for reproduction capital reproduction funds, Problems of mechanical engineering and automation 2 (2011) 56-60
Online since: July 2020
Authors: Ilia I. Beloglazov, Aleksei V. Boikov, Pavel A. Petrov
This complex process is influenced by many factors.
It is quite obvious that the sintering process parameters are affected by both the physicomechanical properties of the powder mixture (bulk density, granular composition, etc.) and its rheological characteristics (angle of repose, friction coefficients) necessary for modeling a granular medium.
Physical and mechanical properties are easily measurable using various laboratory devices, while the determination of rheological properties has its own features.
Many of the properties of nickel aluminide are closely related to its crystalline structure.
Knowledge of the structural features of the material gives an opportunity to evaluate the set of the physical properties, features of new design materials.
It is quite obvious that the sintering process parameters are affected by both the physicomechanical properties of the powder mixture (bulk density, granular composition, etc.) and its rheological characteristics (angle of repose, friction coefficients) necessary for modeling a granular medium.
Physical and mechanical properties are easily measurable using various laboratory devices, while the determination of rheological properties has its own features.
Many of the properties of nickel aluminide are closely related to its crystalline structure.
Knowledge of the structural features of the material gives an opportunity to evaluate the set of the physical properties, features of new design materials.
Online since: March 2015
Authors: Wen Bin Guo, Xue Yi Yu, Zhang Rong Liu
As a multiphase body, usually consists of water, air and varied solid, the loess has a much different mechanical properties and subsidence mechanism to rock.
According to their intensity, direction and property, the principal stress and of overburden can be divided into three cases as follows: (1) Bidirectional tensile stress zone.
Abutment pressure zone above and below the coal pillar, the original stress zone beyond mining influence, and surface loess locating in negative curvature compressive stress zone and soil region affected by abutment pressure above the coal pillar belong to this zone.
Landslide refers to geological disaster phenomena that the shear failure rock or soil entirety or dispersedly slide down along soft surface or weak zone from slope ( often with an angle ranging from 45° to 60° ) acted by nature factors or human engineering activities, such as underground coal mining[12~13], as shown in Fig. 2(c).
For mative factors of loess collapse and method for deter mining its influence range[J].
According to their intensity, direction and property, the principal stress and of overburden can be divided into three cases as follows: (1) Bidirectional tensile stress zone.
Abutment pressure zone above and below the coal pillar, the original stress zone beyond mining influence, and surface loess locating in negative curvature compressive stress zone and soil region affected by abutment pressure above the coal pillar belong to this zone.
Landslide refers to geological disaster phenomena that the shear failure rock or soil entirety or dispersedly slide down along soft surface or weak zone from slope ( often with an angle ranging from 45° to 60° ) acted by nature factors or human engineering activities, such as underground coal mining[12~13], as shown in Fig. 2(c).
For mative factors of loess collapse and method for deter mining its influence range[J].
Online since: October 2011
Authors: Yan Wang, Nabil Gindy, Chang Rong Chen, Heng An Ou
Catastrophic failures due to thermal shocks and heating of die material can lead to die malfunction and instability of mechanical properties.
4 Life extending technology
Die casting dies fail in a variety of ways as mentioned above and measures must be taken to avoid or postpone the advent of these failures as possible.
With the aim to contributing to the knowledge about the molds repair by welding, Pecas et al compared three main processes by classifying their performance for several repair factors.
Journal of Mechanical Design. 120(4)(1998), p. 620-627
Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing. 472(1-2)(2008), p. 198-207
Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing. 379(1-2)(2004), p. 420-431
With the aim to contributing to the knowledge about the molds repair by welding, Pecas et al compared three main processes by classifying their performance for several repair factors.
Journal of Mechanical Design. 120(4)(1998), p. 620-627
Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing. 472(1-2)(2008), p. 198-207
Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing. 379(1-2)(2004), p. 420-431
Online since: July 2017
Authors: Zhi Xiang Xu, Hai Yang Guo
A lot of factors would exercise profound influence on defects detection, thickness detection, coating material characteristic studying.
So every layer output value only affects the next layer input.
Observe the time When the defect emerges, the speed of surface wave is related to the properties and at this time delay phenomenon will happen.
Because existing of coating, it’s apparent to form dispersion which mainly is arose by variety of the refractive index, the extent of which is decided by both substrate and coating’s properties.
Surface wave length has the same magnitude of the thickness of Isotropic or anisotropic properties coating when wave penetrates the coating ,when dispersion occurs because of variety of refractive index.
So every layer output value only affects the next layer input.
Observe the time When the defect emerges, the speed of surface wave is related to the properties and at this time delay phenomenon will happen.
Because existing of coating, it’s apparent to form dispersion which mainly is arose by variety of the refractive index, the extent of which is decided by both substrate and coating’s properties.
Surface wave length has the same magnitude of the thickness of Isotropic or anisotropic properties coating when wave penetrates the coating ,when dispersion occurs because of variety of refractive index.
Online since: October 2013
Authors: Dong Pyo Hong, Hyung Gon Shin, Seung Hyeon Yoo, Seon Woo Park
The chemical and mechanical component of this material is shown in Table 1 and 2.
Table 1 Chemical compositions of workpiece(Wt.%) Material Al V C Fe O N TOE specimen 6.13 3.90 .003 .14 .118 .006 <.30 Table 2 Mechanical properties of Ti-6Al-4VELI Material UTS (psi) YS0.2% (psi) Hardness (HRC) EL (%) Ti-6Al-4V alloy 134000 123000 31 17 Fig. 1 Insert tips (b) K10 (c) TT1300 (a) CNMG3210 Experiment method.
The structure of factor with multiple layers is input 5, hidden layer 1, and node 7, and output uses 5-7-1 per person.
Fig.7 shows the structure of factor with multiple layers.
The surface roughness of machined surface is not affected by the types and has a close relationship with tool wear. 3.
Table 1 Chemical compositions of workpiece(Wt.%) Material Al V C Fe O N TOE specimen 6.13 3.90 .003 .14 .118 .006 <.30 Table 2 Mechanical properties of Ti-6Al-4VELI Material UTS (psi) YS0.2% (psi) Hardness (HRC) EL (%) Ti-6Al-4V alloy 134000 123000 31 17 Fig. 1 Insert tips (b) K10 (c) TT1300 (a) CNMG3210 Experiment method.
The structure of factor with multiple layers is input 5, hidden layer 1, and node 7, and output uses 5-7-1 per person.
Fig.7 shows the structure of factor with multiple layers.
The surface roughness of machined surface is not affected by the types and has a close relationship with tool wear. 3.
Online since: February 2014
Authors: Li Chu, Hua Deng, Yi Zhang
However, the elastic elements affected grasp characteristics are not taken into consideration.
In order to obtain a statically determined system, elastic elements and mechanical limits must be introduced in underactuated systems.
The evlolution of the contact situation can be rather complex, depending on the geometry of the grasped object and the dynamic properties of the phalanges.
Grasp Simulation We focus our attention on the effective factors of grasp stability of the underactuated finger.
The choice of the weight depends on which factor is more important to the capability of the underactuated finger
In order to obtain a statically determined system, elastic elements and mechanical limits must be introduced in underactuated systems.
The evlolution of the contact situation can be rather complex, depending on the geometry of the grasped object and the dynamic properties of the phalanges.
Grasp Simulation We focus our attention on the effective factors of grasp stability of the underactuated finger.
The choice of the weight depends on which factor is more important to the capability of the underactuated finger