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Online since: February 2012
Authors: Fa Rong Du, Shu Chun Yang, Fen Zhu Ji, Yu Chen Guo, Bin Xu
These factors will be considered as the major influence in the design of space lubrication system [1].
However, the complicated environmental factors make the traditional liquid lubrication system does not work normally.
But in recent years, some mechanical parts begin work at low temperature.
The diameter of oil supply hole is one of the main influence factors of the friction surface lubrication state.
Properties of perfluoropolyers for space Application [J].Tribology Transaction, 1995, 38(3):557-546 [2] Zeai Wang, Guoxu Chen.
However, the complicated environmental factors make the traditional liquid lubrication system does not work normally.
But in recent years, some mechanical parts begin work at low temperature.
The diameter of oil supply hole is one of the main influence factors of the friction surface lubrication state.
Properties of perfluoropolyers for space Application [J].Tribology Transaction, 1995, 38(3):557-546 [2] Zeai Wang, Guoxu Chen.
Online since: January 2012
Authors: Xiao Hui Yang, Dong Yan, Kai Xie, Yong Wang
The construction and optimization of high-precision “standard circuit”
High voltage standard capacitor filled with gas was always enabled as the high voltage part of voltage divider for power-frequency voltage measuring, whose character is higher stability capacitance and the almost negligible factor affected by environment (According to the relative regulations for standard capacitor filled with gas[4], the impact factor of temperature and voltage to capacitance is at the level of 10-5).
References [1] China mechanical industry standard, JJG1021, “Instrument Transformers in Power System”, 2007
Zajac, “Metrological Properties of High Voltage Instrument Transformers after Many Years' Service”, CIGRE session 2004, Paper A3-1 13
[3] China mechanical industry standard, JJG169,“Instrument Transformet Test Set”, 1993
[4] China mechanical industry standard, JB/T 1811, “Standard Capacitor filled with Compressed Gas”, 1992.
References [1] China mechanical industry standard, JJG1021, “Instrument Transformers in Power System”, 2007
Zajac, “Metrological Properties of High Voltage Instrument Transformers after Many Years' Service”, CIGRE session 2004, Paper A3-1 13
[3] China mechanical industry standard, JJG169,“Instrument Transformet Test Set”, 1993
[4] China mechanical industry standard, JB/T 1811, “Standard Capacitor filled with Compressed Gas”, 1992.
Online since: October 2014
Authors: Okuwobi Idowu Paul, Yong Hua Lu
Facial Prediction and Recognition Using Wavelets Transform Algorithm and Technique
Okuwobi Idowu Paul and Yonghua Lu
College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 211106, China
Corresp.
Facial recognition is influenced by several factors such as shape, reflectance, pose, occlusion and illumination which make it even more difficult.
The decomposition of the data into different frequency ranges allows us to isolate the frequency components introduced by intrinsic deformations due to expression or extrinsic factors into certain sub-bands.
Meanwhile, small variations in th1and th2 will not affect the performance of the method.
Eigenhill and eigenface methods were highly affected by illumination changes, while the proposed method is more robust to illumination changes as a property of Gabor wavelets..
Facial recognition is influenced by several factors such as shape, reflectance, pose, occlusion and illumination which make it even more difficult.
The decomposition of the data into different frequency ranges allows us to isolate the frequency components introduced by intrinsic deformations due to expression or extrinsic factors into certain sub-bands.
Meanwhile, small variations in th1and th2 will not affect the performance of the method.
Eigenhill and eigenface methods were highly affected by illumination changes, while the proposed method is more robust to illumination changes as a property of Gabor wavelets..
Online since: October 2014
Authors: Jian Xiu Su, Song Zhan Fan, Jia Peng Chen, Hai Feng Cheng
In chemical mechanical polishing (CMP) of ultra-thin stainless steel, the oxidant of polishing slurry determines the material removal rate (MRR).
In recent years, compared with LCD, OLED flat-panel display and plasma display, the advantages of flexible displays have become increasingly prominent, because of its ultra-thin, light weight, durable, large storage capacity, the design freedom, crooked, winded and impact resistance and other properties[1-2].
The processing quality and precision of ultra-thin stainless steel will directly affect the performance of the device [8].
Chemical mechanical polishing (CMP) has been considered as a practical and irreplaceable planarization technology in IC manufacturing.
The oxidant in the slurry can form the oxide film on the substrate surface and removed easily at the subsequent mechanical action.
In recent years, compared with LCD, OLED flat-panel display and plasma display, the advantages of flexible displays have become increasingly prominent, because of its ultra-thin, light weight, durable, large storage capacity, the design freedom, crooked, winded and impact resistance and other properties[1-2].
The processing quality and precision of ultra-thin stainless steel will directly affect the performance of the device [8].
Chemical mechanical polishing (CMP) has been considered as a practical and irreplaceable planarization technology in IC manufacturing.
The oxidant in the slurry can form the oxide film on the substrate surface and removed easily at the subsequent mechanical action.
Online since: April 2009
Authors: Clara Silvestre
The challenge is then to understand how polymer nanostructure impacts the properties of
materials and enables discrete control of the desired materials' properties.
To bridge the gap between scientific and engineering approaches towards improved understanding of the structure-performance correlation in polymer devices It is generally accepted that a better understanding of the structure-property relationships, i.e. of the relationships between composition, processing, structure/morphology, dynamics and properties, is a necessary condition for optimizing the design of polymer nanostructured materials with predicted properties.
For example in the case of polymer nanomaterials to be used in the membranes field, molecular modelling used to obtain a deeper understanding on the relations between molecular structure-transport/barrier properties and to get a detailed insight in transport and other (e.g. mechanical, biocompatibility, controlled release) properties for polymer and blockcopolymers will be provided.
While nanoscale materials possess more novel and unique physicochemical properties than bulk materials, they also have an unpredictable impact on human health.
The peculiar and unique approach of the project, which aims to relate the macroscopic properties with the structural architecture of polymeric materials at molecular level, will contribute to identify the key factors that govern formation of ordered nanopatterns in hybrid systems.
To bridge the gap between scientific and engineering approaches towards improved understanding of the structure-performance correlation in polymer devices It is generally accepted that a better understanding of the structure-property relationships, i.e. of the relationships between composition, processing, structure/morphology, dynamics and properties, is a necessary condition for optimizing the design of polymer nanostructured materials with predicted properties.
For example in the case of polymer nanomaterials to be used in the membranes field, molecular modelling used to obtain a deeper understanding on the relations between molecular structure-transport/barrier properties and to get a detailed insight in transport and other (e.g. mechanical, biocompatibility, controlled release) properties for polymer and blockcopolymers will be provided.
While nanoscale materials possess more novel and unique physicochemical properties than bulk materials, they also have an unpredictable impact on human health.
The peculiar and unique approach of the project, which aims to relate the macroscopic properties with the structural architecture of polymeric materials at molecular level, will contribute to identify the key factors that govern formation of ordered nanopatterns in hybrid systems.
Online since: October 2013
Authors: Miroslav Janoš, Ivan Mrkvica
Inconel 718 is tough and highly temperature resistive material, which is used due to its excellent properties especially in aggressive corrosive medium.
Introduction Nickel-based superalloys are widely used in aerospace applications due their excellent mechanical properties maintained at high temperature and their corrosion resistance.
Tool wear strongly influences production costs and affect surface integrity of the tool [3].
Cutting tool selection is an important factor when machining Ni based alloys.
Mechanical properties: Rm = 1240 MPa, HRC=36 [8].
Introduction Nickel-based superalloys are widely used in aerospace applications due their excellent mechanical properties maintained at high temperature and their corrosion resistance.
Tool wear strongly influences production costs and affect surface integrity of the tool [3].
Cutting tool selection is an important factor when machining Ni based alloys.
Mechanical properties: Rm = 1240 MPa, HRC=36 [8].
Online since: July 2015
Authors: K.G. Saravanan, N. Mohanasundara Raju
Introduction
Ride comfort is an essential factor that determines the quality of a car.
To manage the vehicle vibrations produced due to these factors and enhance the damping factor of the car, the following suspension systems are widely used: Passive, Active and Semi-Active.
This system has an upper hand over both passive and active types due to the rapid and reversible changes in the properties of MR and ER fluids [4, 5].
Magneto Rheological (MR) fluids are a mixture of iron particles in base oil and its shape and structure is constantly affected by a varying magnetic field [6].
This is in accordance to the dynamic properties of the MR fluid and the flexible characteristics of the semi-active damper system.
To manage the vehicle vibrations produced due to these factors and enhance the damping factor of the car, the following suspension systems are widely used: Passive, Active and Semi-Active.
This system has an upper hand over both passive and active types due to the rapid and reversible changes in the properties of MR and ER fluids [4, 5].
Magneto Rheological (MR) fluids are a mixture of iron particles in base oil and its shape and structure is constantly affected by a varying magnetic field [6].
This is in accordance to the dynamic properties of the MR fluid and the flexible characteristics of the semi-active damper system.
Online since: August 2004
Authors: Jan D. Achenbach
Other coatings, such as multilayered ceramic and
metallic coatings, can offer unique physical and mechanical properties due to the refined
microstructure.
The mechanical properties of the thin film and the adhesion quality between coating layers and between the thin film and the substrate determine its functional characteristics.
These properties are very sensitive to a number of factors, which are determined by the deposition technique and by processing parameters.
For essentially the same material, the thinfilm properties may be quite different from bulk properties.
An alternative way to determine the mechanical properties of thin films is by the use of laserbased ultrasonics (LBU).
The mechanical properties of the thin film and the adhesion quality between coating layers and between the thin film and the substrate determine its functional characteristics.
These properties are very sensitive to a number of factors, which are determined by the deposition technique and by processing parameters.
For essentially the same material, the thinfilm properties may be quite different from bulk properties.
An alternative way to determine the mechanical properties of thin films is by the use of laserbased ultrasonics (LBU).
Online since: March 2008
Authors: Matteo Benedetti
One specific advance of titanium alloys is that a wide range of microstructural options can be
produced by thermomechanical processing and heat treatment, permitting to tailor the fatigue
properties as well as to balance the fatigue properties with other design limiting properties (strength,
stiffness, fracture toughness, etc.).
For α+β alloys as well as for the β alloys, the mechanical properties, which are relevant for a particular application, are optimized or balanced to a large extent through microstructural control.
During cooling from the βrecrystallization temperature, extensive grain boundary α-layers are formed (Fig. 2a), which have a negative influence on ductility and fracture toughness because such zones have lower mechanical properties as compared to the lamellar matrix, thus leading to intergranular fracture [14].
The propagation behaviour of microcracks in this stage (flat crack front) is controlled by the fracture properties at the crack tip (fracture stress, ductility).
In the β titanium alloys, the most important microstructural parameter affecting the microcrack propagation resistance is the β grain size: microstructures with small β grain sizes (bimodal) show the best performances in terms of inherent fracture properties.
For α+β alloys as well as for the β alloys, the mechanical properties, which are relevant for a particular application, are optimized or balanced to a large extent through microstructural control.
During cooling from the βrecrystallization temperature, extensive grain boundary α-layers are formed (Fig. 2a), which have a negative influence on ductility and fracture toughness because such zones have lower mechanical properties as compared to the lamellar matrix, thus leading to intergranular fracture [14].
The propagation behaviour of microcracks in this stage (flat crack front) is controlled by the fracture properties at the crack tip (fracture stress, ductility).
In the β titanium alloys, the most important microstructural parameter affecting the microcrack propagation resistance is the β grain size: microstructures with small β grain sizes (bimodal) show the best performances in terms of inherent fracture properties.
Online since: October 2015
Authors: Mária Tóthová, Ján Piteľ, Ján Dubják
Temperature is important technological parameter of production that affects the structure and quality of castings.
Mechanical properties at elevated temperatures are also important; where at low levels in the alloy could occur during braking shrinkage cracking casting [7-9].
Mura, Thermal factors of die casting and their impact on the service life of moulds and the quality of castings, Acta Polytechnica Hungarica 10/3 (2013) 65-78
Mura, Impact of technological factors on dosing of metal at die-casting, Advanced Materials Research 801 (2013) 143-149
Novák-Marcinčin, Influence of technological parameters of die casting on qualitative properties of castings, Manufacturing engineering and technology 1 (2010) 3-6
Mechanical properties at elevated temperatures are also important; where at low levels in the alloy could occur during braking shrinkage cracking casting [7-9].
Mura, Thermal factors of die casting and their impact on the service life of moulds and the quality of castings, Acta Polytechnica Hungarica 10/3 (2013) 65-78
Mura, Impact of technological factors on dosing of metal at die-casting, Advanced Materials Research 801 (2013) 143-149
Novák-Marcinčin, Influence of technological parameters of die casting on qualitative properties of castings, Manufacturing engineering and technology 1 (2010) 3-6