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Online since: May 2014
Authors: Rong Li Gai, Fei Gao, Xiao Hui Sun, Hong Zheng Li, Li Ming Duan
There has three popular categories of word segmentation algorithm [2]:1)Based on mechanical matching;2)Based on the understanding;3)Based on statistical.
At present, the word segmentation based on mechanical matching which is also called word segmentation based on string matching is the dominant.
After segmentation, each sentence will has variety of properties, such as word segmentation number S, single dictionary word count D, non-dictionary single word count N, biggest word length L.
Although majority of ambiguous are crossing ambiguity, but the wrong segmentation will affect the segmentation accuracy, so the combination of different meanings field is need to study the direction of further development, make the segmentation accuracy are improved further.
Because the structure of the dictionary is an important factor related to the speed of word segmentation [9] in the mechanism method.
At present, the word segmentation based on mechanical matching which is also called word segmentation based on string matching is the dominant.
After segmentation, each sentence will has variety of properties, such as word segmentation number S, single dictionary word count D, non-dictionary single word count N, biggest word length L.
Although majority of ambiguous are crossing ambiguity, but the wrong segmentation will affect the segmentation accuracy, so the combination of different meanings field is need to study the direction of further development, make the segmentation accuracy are improved further.
Because the structure of the dictionary is an important factor related to the speed of word segmentation [9] in the mechanism method.
Online since: June 2008
Authors: M. Neil James
This is because they are affected by a wide range of factors, and can
occur as a result of deficiencies in, and subtle interplay amongst, design methods, manufacturing and
fabrication processes, materials selection and performance, and operation and maintenance.
Factors that influence local hardness around joints, and features such as cut-outs hence influence susceptibility to LMAC.
This is free-cutting steel containing dispersed lead particles, with the M grades manufactured to close limits on chemical composition and mechanical properties.
The bolts were, in fact, supplied as grade A steel, indicating no check was specified for mechanical properties.
Thus two main factors contributed to causing this accident; failure of the towbar and failure to ensure that the aircraft taxiway braking system was operative.
Factors that influence local hardness around joints, and features such as cut-outs hence influence susceptibility to LMAC.
This is free-cutting steel containing dispersed lead particles, with the M grades manufactured to close limits on chemical composition and mechanical properties.
The bolts were, in fact, supplied as grade A steel, indicating no check was specified for mechanical properties.
Thus two main factors contributed to causing this accident; failure of the towbar and failure to ensure that the aircraft taxiway braking system was operative.
Online since: October 2006
Authors: Hyung Pil Park, Byung Ohk Rhee, Baeg Soon Cha
Material
property data for ABS-HI-121H from LG chemical Co. was supplied by Moldflow.
This may affect the surface morphology change of the product in the smaller cavity.
The resin viscosity would affect the filling-balance in the variable-runner system so that the process parameters influencing the resin viscosity should be considered carefully as the influencing factors to the filling-balance capability of the variable-runner system.
The difference is considered to be affected by the sensitivity of resin viscosity to temperature. 4.
Coulter, Conference proceedings of ASME International Mechanical Engineering Congress & Exposition, Washington, D.C., Vol. 3(2003) [3] D.
This may affect the surface morphology change of the product in the smaller cavity.
The resin viscosity would affect the filling-balance in the variable-runner system so that the process parameters influencing the resin viscosity should be considered carefully as the influencing factors to the filling-balance capability of the variable-runner system.
The difference is considered to be affected by the sensitivity of resin viscosity to temperature. 4.
Coulter, Conference proceedings of ASME International Mechanical Engineering Congress & Exposition, Washington, D.C., Vol. 3(2003) [3] D.
Online since: September 2012
Authors: Marta Ziemnicka-Sylwester
The sintering additives and their concentrations significantly affected the consolidation process as well as the properties of composites.
Apart from its extremely high elastic properties, TiB2 exhibits high electrical and thermal conductivity, low specific weight, excellent wear resistance and good stability with various liquid metals.
This set of properties is especially appropriate for the fabrication of highly wear resistant components, such as cutting tools [2, 4, 5].
The wetting properties of liquid Fe or Ni are relatively low at liquid phase sintering which affect low relative density and poor homogeneity.
In order to evaluate mechanical properties of investigated samples Vickers hardness and microhardness were determined (Fig.5).
Apart from its extremely high elastic properties, TiB2 exhibits high electrical and thermal conductivity, low specific weight, excellent wear resistance and good stability with various liquid metals.
This set of properties is especially appropriate for the fabrication of highly wear resistant components, such as cutting tools [2, 4, 5].
The wetting properties of liquid Fe or Ni are relatively low at liquid phase sintering which affect low relative density and poor homogeneity.
In order to evaluate mechanical properties of investigated samples Vickers hardness and microhardness were determined (Fig.5).
Online since: November 2012
Authors: Xiao Chu Wang, Wei Li, Jian Peng Zhang
An Overview of the Study and Application of Rubberized Portland Cement Concrete
Wei Li1,2,a ,Xiaochu Wang1,2,b,Jianpeng Zhang1,c
1Shenyang University, Liaoning, Shenyang, 110044,China
2The Key Laboratory of Geoenvironmental Engineering, Liaoning, Shenyang, 110044,China
asydxlw@163. com (corresponding author), bwangxiaochu@126.com, czjpsdwf@163.com
Keywords:rubberized portland cement concrete; rubber particles; amount; properties
Abstract.
Rubber improves the internal structure of concrete mainly and doesn't change its chemistry performance of all kinds of concrete material through the physical and mechanical role, so it doesn't undermine the durability of concrete.
At present, the rubberized portland cement concrete at home and abroad was mainly concentrated in these aspects that strength, deformation, durability, sound insulation, heat insulation and shock absorption properties.
Durability performance The pore structure of concrete is the main factor that affects durability and other performance of concrete.
When a small content of the rubber powder is added to the high-strength concrete, it has little effect on the strength of the concrete, while, porous microstructure of the rubber particles and the formation of more dense channel after heating to melt can strengthen the connectivity of the pore and improve the performance that fracture properties of burst of the high-strength concrete material burst under high temperatures.
Rubber improves the internal structure of concrete mainly and doesn't change its chemistry performance of all kinds of concrete material through the physical and mechanical role, so it doesn't undermine the durability of concrete.
At present, the rubberized portland cement concrete at home and abroad was mainly concentrated in these aspects that strength, deformation, durability, sound insulation, heat insulation and shock absorption properties.
Durability performance The pore structure of concrete is the main factor that affects durability and other performance of concrete.
When a small content of the rubber powder is added to the high-strength concrete, it has little effect on the strength of the concrete, while, porous microstructure of the rubber particles and the formation of more dense channel after heating to melt can strengthen the connectivity of the pore and improve the performance that fracture properties of burst of the high-strength concrete material burst under high temperatures.
Online since: October 2014
Authors: Sebastien Remy, Nadège Troussier, Wen Hua Zhu, De Xian Wang
Machine tool is the basic equipment of machinery industry, playing very important role in today's manufacturing, and its variety, quality and processing efficiency directly affects economic benefits and the technology level of the mechanical industry production.
And this paper involves the analysis of movement patterns during assembly, interference detection and evaluation of Human factors in the process, in order to improve the performance of the product.
According to the properties of object, the feasibility analysis can be divided into the geometric feasibility analysis and the mechanical feasibility analysis.
In the actual assembly environment, the mechanical feasibility analysis is generally required.
The mechanical feasibility analysis refers to the assemble ability under certain assembly space, on the condition of considering the assembly staff and the assembly tool.
And this paper involves the analysis of movement patterns during assembly, interference detection and evaluation of Human factors in the process, in order to improve the performance of the product.
According to the properties of object, the feasibility analysis can be divided into the geometric feasibility analysis and the mechanical feasibility analysis.
In the actual assembly environment, the mechanical feasibility analysis is generally required.
The mechanical feasibility analysis refers to the assemble ability under certain assembly space, on the condition of considering the assembly staff and the assembly tool.
Strain-Induced Interaction of Dissolved Atoms and Mechanical Relaxation in Solid Solutions. A Review
Online since: February 2003
Authors: Leszek B. Magalas, M.S. Blanter
Thus for calculation of the structure and properties of
hydrogen solid solutions in fcc metals, it is necessary to use the energies of elastic interaction in all
2.0 2.4 2.8 3.2
-8
-7
-6
-5
lnD,arb.units
1000/T,K
-1
Fig. 4 Temperature dependence of diffusion coefficients D of hydrogen in Pd calculated with
(triangles) and without (circles) the energies of H-H interaction [27]. coordination shells.
This means that the strain-induced C-C interaction cannot solely describe the thermodynamical properties of austenite.
The influence of interatomic interactions on the pre-exponential factor ∞τ is neglected.
Plastic deformation of fcc steels significantly affects temperature-dependent internal friction in the range of the FR relaxation.
In order to point out the role of these factors, the interaction of carbon atoms with a ½ [110](111) screw dislocation was calculated using a discrete crystal lattice model by means of the so-called 'hybrid' method [82, 83] and the temperature dependence of the internal friction was simulated for a typical Fe-27Ni-0.2C (at.%) austenite alloy, assuming a crystal both with and without dislocations.
This means that the strain-induced C-C interaction cannot solely describe the thermodynamical properties of austenite.
The influence of interatomic interactions on the pre-exponential factor ∞τ is neglected.
Plastic deformation of fcc steels significantly affects temperature-dependent internal friction in the range of the FR relaxation.
In order to point out the role of these factors, the interaction of carbon atoms with a ½ [110](111) screw dislocation was calculated using a discrete crystal lattice model by means of the so-called 'hybrid' method [82, 83] and the temperature dependence of the internal friction was simulated for a typical Fe-27Ni-0.2C (at.%) austenite alloy, assuming a crystal both with and without dislocations.
Online since: November 2018
Authors: Sufizar Ahmad, Siti Nur Farhana Mazlan, Lokman Mohd Noh, Azzura Ismail
Failure Analysis on Heat Exchanger Tube Bundle Exposed to Naphthenic Acid Corrosion
Siti Nur Farhana Mazlan1,a*, Ismail A.1,b, Lokman M Noh Lokman2,c,
Ahmad S.1,d
1Faculty of Mechanical and Manufacturing Engineering, Universiti Tun Hussein Onn Malaysia
2Advanced Petrochemical Company, Jubail Industrial Area 1, 31961 Saudi Arabia
afarhanamazlan29@gmail.com, bazzura@uthm.edu.my, clokman.ccesb@gmail.com, dsufizar@uthm.edu.my
Keywords: Failure Analysis, Naphthenic Acid Corrosion (NAC), Heat Exchanger (HE), stainless steel 410 (SS410)
Abstract.
Naphthenic acid corrosion processes is complicated as it is affected by many factors such as temperature, velocity, acid and sulphur content in the oil or pressure.
As a result, SS410 was chose as tube bundle in HE at most refinery due to good in mechanical properties and reasonable cost.
In this present study, the failure analysis study was done according to ASTM G161-00 (Standard Guide for Corrosion- Related Failure Analysis) [2] on failed HE tube bundle and corrosion factor was listed as a guide for future material selection.
Pitting attack promoted by acid condensate, naphthenic acid corrosion assisted by mechanical component (friction and impingement), and naphthenic acid corrosion where the flow regime affects the fluid corrosively occurred in a vacuum distillation plant after it had been processed.
Naphthenic acid corrosion processes is complicated as it is affected by many factors such as temperature, velocity, acid and sulphur content in the oil or pressure.
As a result, SS410 was chose as tube bundle in HE at most refinery due to good in mechanical properties and reasonable cost.
In this present study, the failure analysis study was done according to ASTM G161-00 (Standard Guide for Corrosion- Related Failure Analysis) [2] on failed HE tube bundle and corrosion factor was listed as a guide for future material selection.
Pitting attack promoted by acid condensate, naphthenic acid corrosion assisted by mechanical component (friction and impingement), and naphthenic acid corrosion where the flow regime affects the fluid corrosively occurred in a vacuum distillation plant after it had been processed.
Online since: December 2011
Authors: Si Nian Li, Yuan Chen, Jia Wang Ye, Shi Zhong Zhang, An Chun Xiao, Hui Min Chen, Zhong Zheng, Hong Chen
Research on the Shrinkage Cavity and Broken Graphite Mold Core of Copper Alloy in Horizontal Continuous Casting
Sinian Li1, a, Yuan Chen1, b, Jiawang Ye 2, c, Shizhong Zhang2, d, Anchun Xiao1, e, Huimin Chen1, f, Zhong Zheng1, g, Hong Chen1, h
1 College of Mechanical Engineering, Hubei University of Technology, Wuhan, Hubei 430068, China
2 Wuhan Fanzhou Chuetsu Metal CO.LTD, Wuhan, Hubei 430015, China
alisn@mail.hbut.edu.cn, b0710cy@163.com
Keywords: Horizontal Continuous Casting, Copper Tube, Shrinkage Cavity, Shrinkage Rate.
Al element mainly solid solutes in the matrix and improves the mechanical properties of materials to meet the performance requirements of mechanical of synchronizer ring.
Summary From Fig. 4 and 5, it’s concluded that the solidus and liquidus temperature of FA6506 copper alloy are a little higher than FA6502 copper alloy, the productions are less affected by mushy solidification, so the quality of productions are better.
The content of Mn and Fe are the mainly factor.
(China 2003), p.18 [7] Shenghua Zhang, Xiangwei Zhao, Zhenzhen Zhan and Yinguo Xiao: Materials for Mechanical Engineering.
Al element mainly solid solutes in the matrix and improves the mechanical properties of materials to meet the performance requirements of mechanical of synchronizer ring.
Summary From Fig. 4 and 5, it’s concluded that the solidus and liquidus temperature of FA6506 copper alloy are a little higher than FA6502 copper alloy, the productions are less affected by mushy solidification, so the quality of productions are better.
The content of Mn and Fe are the mainly factor.
(China 2003), p.18 [7] Shenghua Zhang, Xiangwei Zhao, Zhenzhen Zhan and Yinguo Xiao: Materials for Mechanical Engineering.
Online since: October 2015
Authors: Khosrow Ghavami, Michéle dal Toé Casagrande, Alexandr Zhemchuzhnikov
When the compaction properties of a soil are known, it is possible to prepare samples in the laboratory representative of the material in the field to be used for the determination of its engineering characteristics.
Unlike in Proctor test, where the energy transmitted to the soil is constant, the energy in static compaction test, which can be calculated by integration of force-displacement curve, for a constant maximum pressure or strain depends on a number of factors such as soil type and water content.
If performed slowly, the higher densities can be achieved without affecting CEB quality.
Morel, “Strength and elasto-plastic properties of non-industrial building materials manufactured with clay as a natural binder,” Appl.
Jayawickrama, “Engineering Properties of Unstabilized Compressed Earth Blocks,” in Geo-Frontiers 2011: Advances in Geotechnical Engineering, 2011, pp. 2679–2688
Unlike in Proctor test, where the energy transmitted to the soil is constant, the energy in static compaction test, which can be calculated by integration of force-displacement curve, for a constant maximum pressure or strain depends on a number of factors such as soil type and water content.
If performed slowly, the higher densities can be achieved without affecting CEB quality.
Morel, “Strength and elasto-plastic properties of non-industrial building materials manufactured with clay as a natural binder,” Appl.
Jayawickrama, “Engineering Properties of Unstabilized Compressed Earth Blocks,” in Geo-Frontiers 2011: Advances in Geotechnical Engineering, 2011, pp. 2679–2688