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Online since: January 2015
Authors: Yury Barabanshchikov, Leonids Pakrastinsh, Vitaliy Gatitullin, Ala’ Muhanna
The presence of the film changes the nature of the friction on the surface that could adversely affect traffic and aircraft.
Temperature and humidity conditions to ensure the normal flow pattern formation, have a significant impact on the physical and mechanical properties of concrete: strength, frost resistance, water resistance [10].
These compositions, after application to the surface to form a protective film which decreases moisture loss concrete [14], wherein the mechanical process of applying the dispersion liquid is much simpler than the roll cover material.
Faktory i tekhnologicheskiye peredely, vliyayushchiye na dvizheniye vlagi v betone [Factors and production stages, affecting the movement of moisture in concrete] (2009) Vestnik TGASU, 4, pp. 142-151.
Temperature and humidity conditions to ensure the normal flow pattern formation, have a significant impact on the physical and mechanical properties of concrete: strength, frost resistance, water resistance [10].
These compositions, after application to the surface to form a protective film which decreases moisture loss concrete [14], wherein the mechanical process of applying the dispersion liquid is much simpler than the roll cover material.
Faktory i tekhnologicheskiye peredely, vliyayushchiye na dvizheniye vlagi v betone [Factors and production stages, affecting the movement of moisture in concrete] (2009) Vestnik TGASU, 4, pp. 142-151.
Online since: February 2011
Authors: Da Wei Zhang, Fu Jun Wang, Zhi Peng Ma, Xing Yu Zhao
Liu et al. proposed a quantitative-feedback-theory-based tracking control scheme to eliminate the mechanical vibration of XY table [6].
In that case, some neglected secondary factors in normal conditions could become key issues affecting dynamic performance.
And the residual vibration caused by high speed movement would seriously affect the positioning accuracy and stabilization time of the XY table.
So the x-axis position system motion produces the most significant mechanical resonance.
The achieved results are: For the complex electromechanical coupling system, the oversimplified analytical model could not reflect the actual physical properties of the system.
In that case, some neglected secondary factors in normal conditions could become key issues affecting dynamic performance.
And the residual vibration caused by high speed movement would seriously affect the positioning accuracy and stabilization time of the XY table.
So the x-axis position system motion produces the most significant mechanical resonance.
The achieved results are: For the complex electromechanical coupling system, the oversimplified analytical model could not reflect the actual physical properties of the system.
Online since: January 2015
Authors: Jian Hua Liu, Cheng Tong Tang, Wang Tao Jin, Jia Shun Liu
Physical Modeling for Motional Cable under Smooth Plane Constraint
Jin Wangtao1, a, Liu Jianhua, Tang Chengtong and Liu Jiashun
1School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
awangtao_jin@163.com
Keywords:Motional cable; Smooth plane constraint; Thin elastic rod theory
Abstract.
Introduction As cable parts are widely used in auto, aerospace, aviation and many other fields, normalization and reliability in the process of cable assembling has become one of the most important factors which affect the products assembly quality.
Euler parameters have the property that their sum turns out to be one and the relation to the bending and torsional stiffness wx, wy and wz
Journal of Mechanical Engineering, 2011, 47(9): 117-124
Introduction As cable parts are widely used in auto, aerospace, aviation and many other fields, normalization and reliability in the process of cable assembling has become one of the most important factors which affect the products assembly quality.
Euler parameters have the property that their sum turns out to be one and the relation to the bending and torsional stiffness wx, wy and wz
Journal of Mechanical Engineering, 2011, 47(9): 117-124
Online since: October 2014
Authors: Rizalman Mamat, Wan Hamzah Azmi, Khamisah Abdul Hamid, Nur Ashikin Usri
Thermo-physical properties equations are proposed for the estimation of thermal conductivity and viscosity of water based nanofluids [2].
The properties of nanoparticles are given in Table 1 respectively according to the manufacturer’s specification.
Table 1: Al2O3 nanoparticles properties according to Sigma-Aldrich USA Properties Alumina Oxide (Al2O3) Density [kg/m3] 4000 Melting point/freezing point Melting point/range: 2.040 °C Initial boiling point and boiling range 2.980 °C pH value 9.4 – 10.1 at 20 °C Al2O3 in EG based is prepared using two-step method by using nanoparticles in powder form and later dispersed in the selected base fluid [10].
The mass of Al2O3 were calculated using Eq. 1 with nanoparticles properties from Table 1
Zilio, Experimental measurement of thermophysical properties of oxide–water nano-fluids down to ice-point, Experimental Thermal and Fluid Science. 35 (2011) 1313-1324
The properties of nanoparticles are given in Table 1 respectively according to the manufacturer’s specification.
Table 1: Al2O3 nanoparticles properties according to Sigma-Aldrich USA Properties Alumina Oxide (Al2O3) Density [kg/m3] 4000 Melting point/freezing point Melting point/range: 2.040 °C Initial boiling point and boiling range 2.980 °C pH value 9.4 – 10.1 at 20 °C Al2O3 in EG based is prepared using two-step method by using nanoparticles in powder form and later dispersed in the selected base fluid [10].
The mass of Al2O3 were calculated using Eq. 1 with nanoparticles properties from Table 1
Zilio, Experimental measurement of thermophysical properties of oxide–water nano-fluids down to ice-point, Experimental Thermal and Fluid Science. 35 (2011) 1313-1324
Online since: December 2009
Authors: G.H. Majzoobi, G.H. Farrahi, A. Fadaee
The most cracks appear at the heat affected zone (HAZ) due to tensile high
residual stress during cooling process.
Fatigue behavior of welded structures is complicated as many factors intrinsic to the nature of welded joints are involved [1].
Table 1- Chemical composition of the material C Si Mn P S AL 0.179 0.013 1.26 0.011 0.019 0.053 Mechanical properties of the plates were determined according to ASTM E8-98.
Table 2- Mechanical properties of specimens Properties Standard Specimen Yield Point [MPa] 235 min. 293 U.T.S [MPa] 340-470 420 Elongation % 26% min. 30% The thickness of plates was reduced to 12.5 mm by milling and grinding operations.
Kodama: Proc. of the International Conference on Mechanical Behaviour of Metals II, Kyoto (1972), p.111
Fatigue behavior of welded structures is complicated as many factors intrinsic to the nature of welded joints are involved [1].
Table 1- Chemical composition of the material C Si Mn P S AL 0.179 0.013 1.26 0.011 0.019 0.053 Mechanical properties of the plates were determined according to ASTM E8-98.
Table 2- Mechanical properties of specimens Properties Standard Specimen Yield Point [MPa] 235 min. 293 U.T.S [MPa] 340-470 420 Elongation % 26% min. 30% The thickness of plates was reduced to 12.5 mm by milling and grinding operations.
Kodama: Proc. of the International Conference on Mechanical Behaviour of Metals II, Kyoto (1972), p.111
Online since: July 2014
Authors: Chun Fang Yi, Yi Xin Chen, Pei Song Liang
Corona, as an inevitable influence factor in insulator’s operation, its effect to the material could not be ignored.
And the effect way to study corona’s affect is use the artificial corona[3].
After 100 hours corona effect, the black product come out and the affect area showed a radial effect right under the needles.
It showed that the corona had chemical corrosion and mechanical erosion to the material.
IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 6 No. 5, October 1999 [2]CIGRE WG D 1.14, “Material properties for non-ceramic outdoor insulation: State of the art”, Technical Brochure No. 255, 2004
And the effect way to study corona’s affect is use the artificial corona[3].
After 100 hours corona effect, the black product come out and the affect area showed a radial effect right under the needles.
It showed that the corona had chemical corrosion and mechanical erosion to the material.
IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 6 No. 5, October 1999 [2]CIGRE WG D 1.14, “Material properties for non-ceramic outdoor insulation: State of the art”, Technical Brochure No. 255, 2004
Online since: September 2011
Authors: Jian Sheng Fan, Naseem Baig Muhammad, Jian Guo Nie
Circular columns had all the properties better than other geometric shapes; strength increase was almost 20 % as compared to square columns.
SPECIMEN DETAILS AND MATERIAL PROPERTIES 1.
When strengths of 3 and 4 mm series were compared keeping in view the other properties like L/D, D/t, As % and Hollowness, it is found that there is a definite increase in strength for 4 mm series.
Circular columns had all the properties better than other geometric shapes; strength increase was almost 20 % as compared to 3mm thick columns.
Enhancement factor increases with increase in pipe thickness. 2.
SPECIMEN DETAILS AND MATERIAL PROPERTIES 1.
When strengths of 3 and 4 mm series were compared keeping in view the other properties like L/D, D/t, As % and Hollowness, it is found that there is a definite increase in strength for 4 mm series.
Circular columns had all the properties better than other geometric shapes; strength increase was almost 20 % as compared to 3mm thick columns.
Enhancement factor increases with increase in pipe thickness. 2.
Online since: March 2025
Authors: Ibrahim Abbas
Studying the optical properties and characterization of the synthesised CdO NPs was a fascinating endeavour.
Regarding the matter above CdO, oxides of elements and metals are highly intriguing due to their distinct composition and specialized structure, which allows for the manipulation of their significant mechanical, thermal, optical, and electrical properties [20,22].
This is done by studying their optical properties, represented by the energy gap and absorption spectrum, as well as their structural properties through X-ray diffraction (XRD) analysis of the synthesized nanoparticles.
Several factors play an essential role in changing the colour of deionized water, including the laser parameters used, such as wavelength, pulse duration, and intensity, which significantly affect the extent of colour change and its effect on cadmium absorption.
All of these factors play a role in cadmium's absorption of the incident laser energy, which ultimately leads to a change in the colour of the water in the beaker.
Regarding the matter above CdO, oxides of elements and metals are highly intriguing due to their distinct composition and specialized structure, which allows for the manipulation of their significant mechanical, thermal, optical, and electrical properties [20,22].
This is done by studying their optical properties, represented by the energy gap and absorption spectrum, as well as their structural properties through X-ray diffraction (XRD) analysis of the synthesized nanoparticles.
Several factors play an essential role in changing the colour of deionized water, including the laser parameters used, such as wavelength, pulse duration, and intensity, which significantly affect the extent of colour change and its effect on cadmium absorption.
All of these factors play a role in cadmium's absorption of the incident laser energy, which ultimately leads to a change in the colour of the water in the beaker.
Online since: April 2009
Authors: N.A. Samarin, S.V. Demishev, N.E. Sluchanko, H. Ohta, S. Okubo, A.V. Bogach, N.Y. Shitsevalova, A.V. Semeno
The discovery of new magnetic resonance in CeB6 [6,7] also brings important problems, which
may affect the aforementioned standard approach and change our understanding of the basic physics
of this unusual material.
It was shown [5,6] that the discussed resonant feature (i) represents a bulk property of CeB6 single crystal and is missing in paramagnetic phase (T >TQ), (ii) develops in the phase II (i.e. in the presumably orbitally ordered AFQ phase) for Tfactor for frequency ω/2π=60 GHz.
In addition to the expected resonance A with gfactor ~1.6 a new line B corresponding to the g-factors 1.2-1.3 has been observed for the frequencies exceeding ω/2π~200 GHz (fig. 1).
The latter fact reflects a specific feature of the pulsed field experiments in the superfluid helium, where the experimental set-up becomes more sensitive to a mechanical noise as compared to the case of normal helium (T =4.2 K).
The g-factor values for different magnetic resonances in CeB6.
It was shown [5,6] that the discussed resonant feature (i) represents a bulk property of CeB6 single crystal and is missing in paramagnetic phase (T >TQ), (ii) develops in the phase II (i.e. in the presumably orbitally ordered AFQ phase) for T
In addition to the expected resonance A with gfactor ~1.6 a new line B corresponding to the g-factors 1.2-1.3 has been observed for the frequencies exceeding ω/2π~200 GHz (fig. 1).
The latter fact reflects a specific feature of the pulsed field experiments in the superfluid helium, where the experimental set-up becomes more sensitive to a mechanical noise as compared to the case of normal helium (T =4.2 K).
The g-factor values for different magnetic resonances in CeB6.
Online since: November 2015
Authors: Nur Farahin Abdul Hamid, Rozana Aina Maulat Osman, Mohd Sobri Idris
In addition, BaTiO3 offers a good electrical properties at room temperature, mechanical and chemical stability and easiness in its preparations [4].
In the paper, have studied the influence of La doping on properties of BaTiO3 powder and ceramics prepared by solid state reaction method and the dielectric properties of the undoped BaTiO3 and doped BaTiO3.
Conclusion Doping on BaTiO3 sample has affected the phase structure of the sample.
Stojanovic, Improvement of barium titanate properties induced by attrition milling, 38 (2012) 5347-5354
West, Doping mechanism and electrical properties of La-doped BaTiO3 ceramics, 3 (2001) 1205-1210
In the paper, have studied the influence of La doping on properties of BaTiO3 powder and ceramics prepared by solid state reaction method and the dielectric properties of the undoped BaTiO3 and doped BaTiO3.
Conclusion Doping on BaTiO3 sample has affected the phase structure of the sample.
Stojanovic, Improvement of barium titanate properties induced by attrition milling, 38 (2012) 5347-5354
West, Doping mechanism and electrical properties of La-doped BaTiO3 ceramics, 3 (2001) 1205-1210