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Online since: November 2013
Authors: V.G. Litovchenko, O. Oberemok, V. Vyurkov, V. Popov, V. Melnik, K. Rudenko, B. Romanyuk
Another factor affecting on the properties of the ultra-shallow junctions in Czochralski Si may be an oxygen impurity.
The physical model of oxygen redistribution with the mechanical stress influence is proposed.
In the region of arsenic distribution large mechanical stresses exist; their values are dependent on implantation dose and energy.
When annealing temperature increases, mechanical stress gradient decreases, and quantity of gettered oxygen diminishes.
Oxygen redistribution is connected with tensile mechanical stresses in implanted Si.
The physical model of oxygen redistribution with the mechanical stress influence is proposed.
In the region of arsenic distribution large mechanical stresses exist; their values are dependent on implantation dose and energy.
When annealing temperature increases, mechanical stress gradient decreases, and quantity of gettered oxygen diminishes.
Oxygen redistribution is connected with tensile mechanical stresses in implanted Si.
Online since: June 2014
Authors: Hamid Azizi-Alizamini, Cheng Lu Liu, Warren J. Poole, Nick C. Parson
Introduction
Al-Mg-Si alloys (6xxx series) are widely used for extrusions comprising up to 80% of the extruded shapes due to easy fabrication and good combination of mechanical properties and corrosion resistance [1, 2].
Homogenization temperature is also an important factor affecting the dispersoid density and size during homogenization [9] for alloys containing Mn.
Rometsch, Wang, S.C., Harriss, A., Gregson, P.J. and Starink, M.J., Aluminium Alloys: Their Physical and Mechanical Properties. (2002)
Hatch, Aluminum: properties and physical metallurgy. (1984) [15] B.
Nes, Aluminium Alloys: Their Physical and Mechanical Properties. (2000).
Homogenization temperature is also an important factor affecting the dispersoid density and size during homogenization [9] for alloys containing Mn.
Rometsch, Wang, S.C., Harriss, A., Gregson, P.J. and Starink, M.J., Aluminium Alloys: Their Physical and Mechanical Properties. (2002)
Hatch, Aluminum: properties and physical metallurgy. (1984) [15] B.
Nes, Aluminium Alloys: Their Physical and Mechanical Properties. (2000).
Online since: January 2014
Authors: Jin Hui Li, Chao Deng, Ying Li, Hua Fen Li
Due to their outstanding flame retardant properties, good thermal stabilities and cheap prices, the global demand for PBDEs has been growing rapidly since the 1970s, especially in recent years [2].
Evidences show that PBDEs can affect neurodevelopment, neurobehavior and thyroid hormone regulation in exposed animals and individuals [5].
Because of their excellent properties of flexibility, lightweight, durability, easy shaping and diversified colors, plastics are extensively used in EEE and play out its advantages in the design stage.
Deteriorating mechanical properties of plastics may increase the recycling difficulty due to oxidative degradation during service time [43].
The estimated emission factors of PBDEs from WEEE plastics in wastewater and/or flue gas during the recycle process and waste incineration in Japan ranged from 8×10-9 to 5×10-6, from 1.0×10-7 to 1.8×10-6, respectively [28].
Evidences show that PBDEs can affect neurodevelopment, neurobehavior and thyroid hormone regulation in exposed animals and individuals [5].
Because of their excellent properties of flexibility, lightweight, durability, easy shaping and diversified colors, plastics are extensively used in EEE and play out its advantages in the design stage.
Deteriorating mechanical properties of plastics may increase the recycling difficulty due to oxidative degradation during service time [43].
The estimated emission factors of PBDEs from WEEE plastics in wastewater and/or flue gas during the recycle process and waste incineration in Japan ranged from 8×10-9 to 5×10-6, from 1.0×10-7 to 1.8×10-6, respectively [28].
Online since: May 2011
Authors: Ata El-Kariem, S. Shoeib
The interaction between the fiber and the matrix is the fundamental property that affects the performance of discrete fiber composite cement past.
In this case, the fibers behave as non-active inclusion leading to only marginal improvement in the mechanical properties [1].
Table 2 Experimental tested results Specimen Factors Compression strength (Mpa) Increase ratio density (kg/cm2) Fiber length fiber ratio C : S W:C Group one 1 20 1.5 1:3 0.47 27.1 15.3 2030 2 35 1.5 1:3 0.47 27.4 16.5 2240 3 50 1.5 1:3 0.47 24 2.0 2180 4 20 3.0 1:3 0.47 29.45 25.3 2200 5 35 3.0 1:3 0.47 28.2 20 2270 6 50 3.0 1:3 0.47 20 -15 21750 7 20 4.5 1:3 0.47 17.2 -27 2070 8 35 4.5 1:3 0.47 21.1 -10.2 2175 9 50 4.5 1:3 0.47 17.96 -23.6 2195 Group two 10 20 1.5 1:2 0.47 22.04 13.02 2200 11 35 1.5 1:2 0.47 22.00 12.8 2300 12 50 1.5 1:2 0.47 20.45 4.8 2285 13 20 3.0 1:2 0.47 25.0 35.9 2280 14 35 3.0 1:2 0.47 25.8 32.3 2240 15 50 3.0 1:2 0.47 21.2 8.25 2150 16 20 4.5 1:2 0.47 21.0 7.7 2184 17 50 4.5 1:2 0.47 20.7 6.1 2180 Group three 18 20 1.5 1:4 0.47 16.02 9.70 2030 19 35 1.5 1:4 0.47 16 8.6 2050 20 50 1.5 1:4 0.47 16.25 11.30 2140 21 20 3.0 1:4 0.47 11.5 -21.5 2050 22 35 3.0 1:4 0.47 10.1 -30.8 2000 23 45 3.0 1:4 0.47 9.5 -35.5 1850 24 20 4.5 1:4 0.47 6.75 -53.7 1835 25 50 4.5
S.: Mechanical properties of steel fiber reinforced rapid-set materials.
:Mechanical properties of glass and steel fiber reinforced mortar,” ACI Journal. – V.73, № 10. – (1976) P. 50 – 53.
In this case, the fibers behave as non-active inclusion leading to only marginal improvement in the mechanical properties [1].
Table 2 Experimental tested results Specimen Factors Compression strength (Mpa) Increase ratio density (kg/cm2) Fiber length fiber ratio C : S W:C Group one 1 20 1.5 1:3 0.47 27.1 15.3 2030 2 35 1.5 1:3 0.47 27.4 16.5 2240 3 50 1.5 1:3 0.47 24 2.0 2180 4 20 3.0 1:3 0.47 29.45 25.3 2200 5 35 3.0 1:3 0.47 28.2 20 2270 6 50 3.0 1:3 0.47 20 -15 21750 7 20 4.5 1:3 0.47 17.2 -27 2070 8 35 4.5 1:3 0.47 21.1 -10.2 2175 9 50 4.5 1:3 0.47 17.96 -23.6 2195 Group two 10 20 1.5 1:2 0.47 22.04 13.02 2200 11 35 1.5 1:2 0.47 22.00 12.8 2300 12 50 1.5 1:2 0.47 20.45 4.8 2285 13 20 3.0 1:2 0.47 25.0 35.9 2280 14 35 3.0 1:2 0.47 25.8 32.3 2240 15 50 3.0 1:2 0.47 21.2 8.25 2150 16 20 4.5 1:2 0.47 21.0 7.7 2184 17 50 4.5 1:2 0.47 20.7 6.1 2180 Group three 18 20 1.5 1:4 0.47 16.02 9.70 2030 19 35 1.5 1:4 0.47 16 8.6 2050 20 50 1.5 1:4 0.47 16.25 11.30 2140 21 20 3.0 1:4 0.47 11.5 -21.5 2050 22 35 3.0 1:4 0.47 10.1 -30.8 2000 23 45 3.0 1:4 0.47 9.5 -35.5 1850 24 20 4.5 1:4 0.47 6.75 -53.7 1835 25 50 4.5
S.: Mechanical properties of steel fiber reinforced rapid-set materials.
:Mechanical properties of glass and steel fiber reinforced mortar,” ACI Journal. – V.73, № 10. – (1976) P. 50 – 53.
Online since: October 2013
Authors: Zheng He, Zhe Zhang, Jin Ping Ou
The ductility of coupling walls is a key factor affecting the ultimate bearing capacity of coupled shear wall structure.
It can be seen by making a comparison of the results, that different opening forms have a great effect on the mechanical properties .With the increase of pore porosity, the hysteretic behavior and the maximum bearing capacity show a declined tendency.
The mechanical properties of opening up-down is better than the other opening forms, and with the increase of pore areas, its performance decline slightly.
The mechanical properties of biserial opening form and central opening form is similar while uniserial opening form is the least efficient.
Based on the Kriging agent model to optimize damper coupling beam analysis Through the preliminary analysis of various forms of holes coupling beam dampers on the mechanical properties, we can select better mechanical properties focus on opening up and down even in the form of beam dampers for further optimization design.
It can be seen by making a comparison of the results, that different opening forms have a great effect on the mechanical properties .With the increase of pore porosity, the hysteretic behavior and the maximum bearing capacity show a declined tendency.
The mechanical properties of opening up-down is better than the other opening forms, and with the increase of pore areas, its performance decline slightly.
The mechanical properties of biserial opening form and central opening form is similar while uniserial opening form is the least efficient.
Based on the Kriging agent model to optimize damper coupling beam analysis Through the preliminary analysis of various forms of holes coupling beam dampers on the mechanical properties, we can select better mechanical properties focus on opening up and down even in the form of beam dampers for further optimization design.
Online since: July 2014
Authors: Yuan Zheng, Chun Xia Yang, Xiao Qing Tian, Yu Quan Zhang, Meng Tian Lu
The turbine’s property was predicted by the 3-d numerical simulation software on the whole flow passage.
It is inexhaustible, and can’t be affected by flood or water shortage.
And the corrosion on the surface of flow over parts usually affects unit’s life.
It is necessary to optimize the inlet part (shape and size) of vertical shaft tubular turbine, considering hydraulic factors and structural factors.
Charlotte, NC, United states: American Society of Mechanical Engineers, 2004, pp601-608
It is inexhaustible, and can’t be affected by flood or water shortage.
And the corrosion on the surface of flow over parts usually affects unit’s life.
It is necessary to optimize the inlet part (shape and size) of vertical shaft tubular turbine, considering hydraulic factors and structural factors.
Charlotte, NC, United states: American Society of Mechanical Engineers, 2004, pp601-608
Online since: July 2018
Authors: Nikita Stepanov, Sergey Zherebtsov, Gennady Salishchev, Vitaliy Sokolovsky, Nadezhda Nochovnaya, Pavel Panin
Introduction
Intermetallic γ-TiAl based alloys are considered as promising materials for aerospace and automotive industries, and potentially can be used for manufacturing of gas turbine blades, turbine rotor discs, and automobile valves due to low density and good high-temperature properties [1, 2].
Gleeble 3800 thermo-mechanical machine was used for the tests.
Mechanical behavior.
The combination of a number of factors (high deformation temperatures, small grain size, the existence of soft β phase laths limiting the α grains/particles coarsening and contributing to faster diffusion) promotes SP flow of the alloy at high strain rates.
Mayer, Design, processing, microstructure, properties, and applications of advanced intermetallic TiAl alloys, Adv.
Gleeble 3800 thermo-mechanical machine was used for the tests.
Mechanical behavior.
The combination of a number of factors (high deformation temperatures, small grain size, the existence of soft β phase laths limiting the α grains/particles coarsening and contributing to faster diffusion) promotes SP flow of the alloy at high strain rates.
Mayer, Design, processing, microstructure, properties, and applications of advanced intermetallic TiAl alloys, Adv.
Online since: October 2014
Authors: Yong Tao, Ting Ting Yu, Hong Xia Cai, Yu Jie Bai
Research on the Impact of Needle Valve Orifice Chamfering on the Performance Based on Fluent
Yong Tao a*, Hongxia Cai b, Yujie Bai c and Tingting Yu d
Shanghai Key Laboratory of Mechanical Automation and Robotics, School of Mechatronics Engineering and Automation, Shanghai University, Shanghai, China
ataoyong@shu.edu.cn, bhxcai@staff.shu.edu.cn, cbaiyujie@shu.edu.cn, dyutingting499@163.com
Keywords: Needle Valve; Flow Coefficient; Computational Fluid Dynamics; Grinding.
Needle valve as one of the most important components in injection system, it will directly affect the performance of the injection system0.
When r / D is about 0.3 to 0.4, that is, when the improvement of orifice chamfering on orifice flow coefficient closes to stable, the impact of cavitation on jetting property is minimal.
[2] J.D.Yu, X.L.Miao.The research of nozzle flowcoefficient factor and injection characteristics [J].Modern Vehicle Power, pp.19-23, August 2007
Solid-liquid two-phase flow model and pressure characteristics simulation of abrasive flow machining [J].Chinese Mechanical Engineering, pp.17-19, April 2008
Needle valve as one of the most important components in injection system, it will directly affect the performance of the injection system0.
When r / D is about 0.3 to 0.4, that is, when the improvement of orifice chamfering on orifice flow coefficient closes to stable, the impact of cavitation on jetting property is minimal.
[2] J.D.Yu, X.L.Miao.The research of nozzle flowcoefficient factor and injection characteristics [J].Modern Vehicle Power, pp.19-23, August 2007
Solid-liquid two-phase flow model and pressure characteristics simulation of abrasive flow machining [J].Chinese Mechanical Engineering, pp.17-19, April 2008
Online since: October 2009
Authors: Dein Shaw, Po Yen Hsu, Shih Liang Chen
The binary ART method uses the property of x-ray absorb rate of metal,
silicon and other non- metal material are extremely different.
The relaxation factor can improve quality of reconstructed image by using the ART under noisy condition.
The suggestion of the magnitude of the factor is between zero and two.
This affects the image quality a lot, and makes the image blur.
However, the real detector properties still need more study for more accurate analysis.
The relaxation factor can improve quality of reconstructed image by using the ART under noisy condition.
The suggestion of the magnitude of the factor is between zero and two.
This affects the image quality a lot, and makes the image blur.
However, the real detector properties still need more study for more accurate analysis.
Online since: August 2016
Authors: Josef Meinhardt, Hannes Grass, Marion Merklein, Sebastian Kreissl, Christoph Amann
Besides the three mentioned main sources of process-induced distortions, several additional influencing factors have been considered.
Among these influencing factors, a gradient in fibre volume fraction seems to be most critical, since almost all effective laminate properties are affected.
They took only laminate properties and tool-laminate interface effects into account.
It is assumed that the described deviations are mainly caused by resin properties not captured accurately enough yet.
DuBois, Properties & limits: Review of shell element formulations, in: Developer Forum, Filderstadt, 2013
Among these influencing factors, a gradient in fibre volume fraction seems to be most critical, since almost all effective laminate properties are affected.
They took only laminate properties and tool-laminate interface effects into account.
It is assumed that the described deviations are mainly caused by resin properties not captured accurately enough yet.
DuBois, Properties & limits: Review of shell element formulations, in: Developer Forum, Filderstadt, 2013