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Online since: March 2013
Authors: Mohamad Rusop Mahmood, Mohamad Hafiz Mamat, M.N. Berhan, A.S.M. Rodzi
The optical properties showed when increased annealing temperatures, so the high UV was transmit.
The properties of thin films are affected by several factors such as annealing temperature [3], annealing time, annealing ambient [4], and type of substrate used [5].
At UV range, the absorbance characteristic was high due to its wide band gap properties.
The optical properties of the thin films have been investigated.
Zoolfakar, Study on Electrical Properties of Zinc Oxide Thin Film, (2008) 123-126
The properties of thin films are affected by several factors such as annealing temperature [3], annealing time, annealing ambient [4], and type of substrate used [5].
At UV range, the absorbance characteristic was high due to its wide band gap properties.
The optical properties of the thin films have been investigated.
Zoolfakar, Study on Electrical Properties of Zinc Oxide Thin Film, (2008) 123-126
Online since: December 2010
Authors: Song Mei Yuan, Mao Bin Lv, Xue Hao Liu
The static stiffness of the spindle and its influencing factors are analyzed in section 3.
The natural frequency of the spindle and its influencing factors are analyzed in section 4.
The stiffness of the spindle is in relation to the extended length of the spindle, the spacing of the front and rear bearings, the geometry dimension, the physical properties of metal, as well as the stiffness of the bearing.
With different preload, the stiffness of the bearing is different so as to affect the spindle stiffness.
By the sensitivity analysis of the design parameters, the main factors influencing the static and dynamic characteristics are found, which significantly simplifies the optimization of the spindle.
The natural frequency of the spindle and its influencing factors are analyzed in section 4.
The stiffness of the spindle is in relation to the extended length of the spindle, the spacing of the front and rear bearings, the geometry dimension, the physical properties of metal, as well as the stiffness of the bearing.
With different preload, the stiffness of the bearing is different so as to affect the spindle stiffness.
By the sensitivity analysis of the design parameters, the main factors influencing the static and dynamic characteristics are found, which significantly simplifies the optimization of the spindle.
Online since: September 2011
Authors: Jiang Han, Shao Wu Zhang, Zhi Jun Hu, Jun Zhao
Because TT series ceramic filters are adaptable to filtering medium and filtration board is made of microporous ceramic materials, they have excellent properties including resistance to high temperature and corrosion as well as adjustable microporous aperture.
This directly affects the ceramic plate cleaning effect and filter efficiency.
The major factors leading to backwash pressure fluctuations include the following: 1) Backwash pressure fluctuations from vacuum negative pressure in the backwash channel of the rotor The backwash channel in each ceramic plate of the rotor develops vacuum during water absorption and drying processes, which induces big negative pressure in vacuum channels (~ 0.09 MPa).
The extent of the fluctuation depends on the degree of negative vacuum pressure, unoccupied volume of the backwash channel and the internal diameter of the backwash pipeline. 2) Backwash flow of water through volume mutations affecting the backwash pressure fluctuations When the rotor backwash channel and backwash pipeline switched from closed to interlinked positions, fluctuation in backwash pressure develops as the volume of backwash water changes.
The pressure for the fluid is dependent on the loading; thus the backwash pressure will decrease rapidly if the backwash channel of the rotor has no or small amount of loading. 3) Backwash pressure fluctuations arising from variations in external water or pipe pump pressure Fluctuations in external water or pipeline pump pressure generally falls in the range of 0.3-0.4 MPa, which can also induce backwash pressure fluctuations. 4) Other factors influencing backwash pressure fluctuations Aside from the factors discussed above, perturbation from the on-off manual switch, imperfect cooperation between the distribution valve and rotor, and inconsistent pore sizes between connecting ceramic filtering plates can also lead to certain pressure fluctuations.
This directly affects the ceramic plate cleaning effect and filter efficiency.
The major factors leading to backwash pressure fluctuations include the following: 1) Backwash pressure fluctuations from vacuum negative pressure in the backwash channel of the rotor The backwash channel in each ceramic plate of the rotor develops vacuum during water absorption and drying processes, which induces big negative pressure in vacuum channels (~ 0.09 MPa).
The extent of the fluctuation depends on the degree of negative vacuum pressure, unoccupied volume of the backwash channel and the internal diameter of the backwash pipeline. 2) Backwash flow of water through volume mutations affecting the backwash pressure fluctuations When the rotor backwash channel and backwash pipeline switched from closed to interlinked positions, fluctuation in backwash pressure develops as the volume of backwash water changes.
The pressure for the fluid is dependent on the loading; thus the backwash pressure will decrease rapidly if the backwash channel of the rotor has no or small amount of loading. 3) Backwash pressure fluctuations arising from variations in external water or pipe pump pressure Fluctuations in external water or pipeline pump pressure generally falls in the range of 0.3-0.4 MPa, which can also induce backwash pressure fluctuations. 4) Other factors influencing backwash pressure fluctuations Aside from the factors discussed above, perturbation from the on-off manual switch, imperfect cooperation between the distribution valve and rotor, and inconsistent pore sizes between connecting ceramic filtering plates can also lead to certain pressure fluctuations.
Online since: April 2012
Authors: Wei Fang Zhang, Mei Li Ding, Ming Yuan Yang, Li Jun Fu
Introduction
With the development of rubber industry, various kinds of rubber material and products with unique excellent properties are used more and more extensively in aerospace equipment.
Nitrile Butadiene Rubber(NBR) is widely used in aviation sealing products because of its excellent adhesive, processing and mechanical properties[1-4].
The factors influencing the data fluctuation are less, so the accuracy, repeatability and reproducibility of the lifetime forecast result can be guaranteed
It can avoid gap between the two parts caused by thread abrade which is a result of repeated use, and then affected test accuracy
Study on degradation rule of physical mechanical property of vulcanizate during the period of heat ageing[J].Special purpose rubber products. 1997, Vol.18(1): 42-50 [2]Ding Meili, Zhang Weifang, Hou Weigou.
Nitrile Butadiene Rubber(NBR) is widely used in aviation sealing products because of its excellent adhesive, processing and mechanical properties[1-4].
The factors influencing the data fluctuation are less, so the accuracy, repeatability and reproducibility of the lifetime forecast result can be guaranteed
It can avoid gap between the two parts caused by thread abrade which is a result of repeated use, and then affected test accuracy
Study on degradation rule of physical mechanical property of vulcanizate during the period of heat ageing[J].Special purpose rubber products. 1997, Vol.18(1): 42-50 [2]Ding Meili, Zhang Weifang, Hou Weigou.
Online since: July 2015
Authors: Viton Uthaisangsuk, Pitak Khaimanee, Paiboon Choungthong
The increased aging time certainly led to higher amount of the HCP martensite and consequently increased hardness and possible wear resistance properties.
These alloys show a great combination of mechanical properties, corrosion resistance, wear resistance and biocompatibility.
In the previous studies, it was reported that the presence of the HCP crystal structure is one of the main factors that cause a lower wear rate compared to the FCC structure.
Thus, the longer aging time definitely led to increased amount of the HCP martensite, increased hardness and consequently possible wear resistance properties.
Muterlle, microstructural and mechanical properties of co and ti alloys for biomedical applications produced by metal injection molding, Dissertation, University of Trento, (2012) 14-22
These alloys show a great combination of mechanical properties, corrosion resistance, wear resistance and biocompatibility.
In the previous studies, it was reported that the presence of the HCP crystal structure is one of the main factors that cause a lower wear rate compared to the FCC structure.
Thus, the longer aging time definitely led to increased amount of the HCP martensite, increased hardness and consequently possible wear resistance properties.
Muterlle, microstructural and mechanical properties of co and ti alloys for biomedical applications produced by metal injection molding, Dissertation, University of Trento, (2012) 14-22
Inertia Parameters Identification of Motor Assembly for Electric Vehicles Based on Modal Test Method
Online since: December 2013
Authors: Peng Yu, Tong Zhang, Rong Guo, Li Zhao He
Therefore, proper points coordinates will minimize matrix condition number and , which will affect the inertia parameters test error directly.
The excitation and response points coordinates accuracy are found to be the main influence factors based on the error analysis using matrix condition number.
[2] R.A.B.Almeida, A.P.V.Urgueira and N.M.M.Maia, Identification of rigid body properties from vibration measurements, Journal of Sound and Vibration, 2007, 299, 884-899
Schedlinski, A survey of current inertia parameter identification methods, Mechanical Systems and Signal Processing, 2001, 15(1), 189-211
Response and excitation points selection for accurate rigid body inertia properties identification, Mechanical Systems and Signal Processing, 1999, 13(4), 571-592
The excitation and response points coordinates accuracy are found to be the main influence factors based on the error analysis using matrix condition number.
[2] R.A.B.Almeida, A.P.V.Urgueira and N.M.M.Maia, Identification of rigid body properties from vibration measurements, Journal of Sound and Vibration, 2007, 299, 884-899
Schedlinski, A survey of current inertia parameter identification methods, Mechanical Systems and Signal Processing, 2001, 15(1), 189-211
Response and excitation points selection for accurate rigid body inertia properties identification, Mechanical Systems and Signal Processing, 1999, 13(4), 571-592
Online since: November 2012
Authors: Wu Yi, Zhao Ping Meng, Guo Qing Li, Zhi Wei Jin
Reservoir water level is one important factor influencing the stability of landslides.
The pore water pressure and seepage force in landslide during reservoir impoundment and drawdown are two important factors affecting the stability of a reservoir landslide.
Each seepage mode will produce different seepage force or pore water pressure and thereby affect the stability of landslide, which is shown in Table 1.
Table 1, Seepage mode of landslide and its mechanism in Three Gorges Reservoir area Landslide type Landslide groundwater seepage mode Mechanical mechanism Classification basis and landslide stability features lag behind impoundment (X-I) (1)The rising rate of groundwater level is smaller than that of reservoir water level, landslide has poor permeability;(2)The reservoir water level is higher than the groundwater level of landslide and reservoir water infiltrates into landslide and thereby produces seepage force opposite to the inside of landslide which will enhance the landslide stability;(3) Landslide fails due to slope body softened and bank rebuilding;(4) Landslide stability depends on the properties of the rock mass structure and rock lithology.
Landslide stability depends on the properties of the rock mass structure and rock lithology.
The pore water pressure and seepage force in landslide during reservoir impoundment and drawdown are two important factors affecting the stability of a reservoir landslide.
Each seepage mode will produce different seepage force or pore water pressure and thereby affect the stability of landslide, which is shown in Table 1.
Table 1, Seepage mode of landslide and its mechanism in Three Gorges Reservoir area Landslide type Landslide groundwater seepage mode Mechanical mechanism Classification basis and landslide stability features lag behind impoundment (X-I) (1)The rising rate of groundwater level is smaller than that of reservoir water level, landslide has poor permeability;(2)The reservoir water level is higher than the groundwater level of landslide and reservoir water infiltrates into landslide and thereby produces seepage force opposite to the inside of landslide which will enhance the landslide stability;(3) Landslide fails due to slope body softened and bank rebuilding;(4) Landslide stability depends on the properties of the rock mass structure and rock lithology.
Landslide stability depends on the properties of the rock mass structure and rock lithology.
Online since: May 2018
Authors: Cheng Wu Zhang, Fengjun Zhao, Yong Dong He
The study gave a new way to analyze the viscosity, further, these factors play an important in effects of viscosity.
1.
The influence of microscopic factors on the viscosity was obtained by these ways.
Paul, Variability in mechanical properties of a metal foam, Acta Mater. 52(4) (2004) 869-876
Embury, Structure and properties of Alø SiC foam, Materials Science and Engineering: A 199(2) (1995) 195-203
Ashby, Cellular solids: structure and properties, Cambridge university press1999
The influence of microscopic factors on the viscosity was obtained by these ways.
Paul, Variability in mechanical properties of a metal foam, Acta Mater. 52(4) (2004) 869-876
Embury, Structure and properties of Alø SiC foam, Materials Science and Engineering: A 199(2) (1995) 195-203
Ashby, Cellular solids: structure and properties, Cambridge university press1999
Online since: April 2012
Authors: Mahamad Noor Wahab, Abdul Razak Daud
There were reports on metal matrix composites reinforced with ceramics in the form of fibers, whiskers or particulates [5,6] that showed significant improvements in their physical and mechanical properties.
Microstructure and phases are among the important factors that determine physical and mechanical properties of alloys and composites.
Grain size, precipitates and foreign materials significantly influence the mechanical properties of alloys or composites.
Many literature have reported that the presence of spheroidal Si has tremendouly improved the mechanical properties of aluminum alloys [2-4].
Ray, Effect of aging on mechanical properties of 6063 Al-alloy using instrumented ball indentation technique, Materials Science and Engineering A 527(6)(2010) 1590-1594
Microstructure and phases are among the important factors that determine physical and mechanical properties of alloys and composites.
Grain size, precipitates and foreign materials significantly influence the mechanical properties of alloys or composites.
Many literature have reported that the presence of spheroidal Si has tremendouly improved the mechanical properties of aluminum alloys [2-4].
Ray, Effect of aging on mechanical properties of 6063 Al-alloy using instrumented ball indentation technique, Materials Science and Engineering A 527(6)(2010) 1590-1594
Online since: June 2012
Authors: Chang Zhong Wu, Shu Guang Sang
Introduction
With the industrial machine tool constantly developing to the direction of high accuracy and automation, stiffness of machine tools has become an important factor in improving machining accuracy and stability.
The mechanical structure of stiffness of machine tool testing device is shown in Fig. 1.
Using BPR-40 strain gauge pressure sensors for force measurement, it has good antiknock characteristic, good impact resistance properties and static/dynamic characteristics.
Mechanical engineering testing technology [M].
Mechanical Industry Press, 2006 [2] Yan Li, Lei Zhang, Chun Liu, Gang Yin.
The mechanical structure of stiffness of machine tool testing device is shown in Fig. 1.
Using BPR-40 strain gauge pressure sensors for force measurement, it has good antiknock characteristic, good impact resistance properties and static/dynamic characteristics.
Mechanical engineering testing technology [M].
Mechanical Industry Press, 2006 [2] Yan Li, Lei Zhang, Chun Liu, Gang Yin.