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Online since: March 2012
Authors: Magdalena Szumera, Łukasz Zych, Aleksander Góra, Ewa Stodolak-Zych
Orientation of nanoparticles in polymer fibres depends on many factors such as; flow rate of a polymer solution and a capillary length.
Spiral movement of the polymer solution or a polymer suspension of nanoparticles is disturbed by many factors causing detoriations of the applied electric field.
Addition of the nanometric powders significantly affected the polymer viscosity (Table 3).
Therefore, in the investigated materials agglomeration of a nanofiller did not have negative effect on properties of the nanocomposite materials used in regenerative medicine.
Diameters of the produced fibres strongly depend on the process parameters such as distance between the needle and the collector, intensity of electric filed and properties of the solution i.e.; it viscosity, and solvents type.
Spiral movement of the polymer solution or a polymer suspension of nanoparticles is disturbed by many factors causing detoriations of the applied electric field.
Addition of the nanometric powders significantly affected the polymer viscosity (Table 3).
Therefore, in the investigated materials agglomeration of a nanofiller did not have negative effect on properties of the nanocomposite materials used in regenerative medicine.
Diameters of the produced fibres strongly depend on the process parameters such as distance between the needle and the collector, intensity of electric filed and properties of the solution i.e.; it viscosity, and solvents type.
Online since: January 2013
Authors: Olga Troynikov, Nazia Nawaz, Irena Yermakova
Kevlar® is the registered trademark for a para-aramid synthetic fiber with similar properties, related to other aramids such as Nomex® and Technora®.
Garment style, fit and construction are also important factors to consider.
Material properties such as fabric stiffness, bending rigidity and drape ability also affect the fit of the garments (Fig. 5).
[19] AATCC Test method 195-2011, Liquid Moisture Management Properties of Textile Fabrics. 2009
Xu, , Moisture Management Tester: A Method to Characterize Fabric Liquid Moisture Management Properties.
Garment style, fit and construction are also important factors to consider.
Material properties such as fabric stiffness, bending rigidity and drape ability also affect the fit of the garments (Fig. 5).
[19] AATCC Test method 195-2011, Liquid Moisture Management Properties of Textile Fabrics. 2009
Xu, , Moisture Management Tester: A Method to Characterize Fabric Liquid Moisture Management Properties.
Online since: October 2006
Authors: Bartek A. Glowacki
The global energy need is expected to double by 2030, increasing by a factor of 5 by 2100
due to human population growth and accelerated global industrialisation.
There is ongoing research into how long-term exposure to the high voltage overhead power lines may affect our health.
Round wires with properties equal to tapes will be highly beneficial to design improved high amperage conductors.
Wheel-rail rolling noise is dominant up to speeds around 200-300 km/h, after which aerodynamic noise takes over as dominant factor, as shown in Fig. 12a.
There are additional factors such as extreme atmospheric conditions like snow storms, when snow clearance must be conducted by rotary machines coupled to the train.
There is ongoing research into how long-term exposure to the high voltage overhead power lines may affect our health.
Round wires with properties equal to tapes will be highly beneficial to design improved high amperage conductors.
Wheel-rail rolling noise is dominant up to speeds around 200-300 km/h, after which aerodynamic noise takes over as dominant factor, as shown in Fig. 12a.
There are additional factors such as extreme atmospheric conditions like snow storms, when snow clearance must be conducted by rotary machines coupled to the train.
Online since: March 2016
Authors: Jian Sheng Chen, Ding Wang
However, the aging problem of ferroelectric materials can lead to decreasing piezoelectric properties over time.
They also have relatively high mechanical quality factor, which indicates high sensing precision.
The best BZT-CuO ceramics showed excellent piezoelectric properties with d33 ~ 320 pC/N and k ~ 44%.
It requires poling and mechanical stretching to induce the piezoelectric properties to piezoelectric polymers.
Mechanical stretching is required for inducing piezoelectric properties into piezoelectric polymers.
They also have relatively high mechanical quality factor, which indicates high sensing precision.
The best BZT-CuO ceramics showed excellent piezoelectric properties with d33 ~ 320 pC/N and k ~ 44%.
It requires poling and mechanical stretching to induce the piezoelectric properties to piezoelectric polymers.
Mechanical stretching is required for inducing piezoelectric properties into piezoelectric polymers.
Online since: December 2012
Authors: Dong Sheng Zhang, Xu Feng Wang, Yang Zhang, Jin Liang Wang
In some areas the coal quality is better, if the thin coal seam could not be mined timely and rationally, it will be bound to cause resource waste and mine service life shortening, which will affect sustainable development[1,2].
Due to there is no experience of mechanical mining thin coal seam to use for reference in Liuquan Mine or surrounding mines, it has be a key problem to be solved in Liuquan Mine that exploring new technological approaches for Effective development and utilization of thin coal seam resources. 2.
Physico-mechanical properties of surrounding rock were determined refer to the actual rock mechanics properties of Liuquan Mine.
(3) The volume of prop able compression should be adaptable to main roof sinking in fracture zone The roof subsidence at maximum roof control distance Δh could be estimated as follow: Where, L'D—maximum roof control distance( distance from coal wall to timber wall, pier stud or last row props), m; H—subsidence of fissure zone in the position of main roof fault block contact with gangue, H=M-h(Kz-1)-h1(Kl-1), (where, M is mining height, Kz is bulking factor of immediate roof rock strata, 1.33~1.5, h is thickness of immediate roof, h1 is thickness of main roof in caving zone and additional rock strata, Kl is bulking factor of main roof in caving zone and additional rock strata, 1.15~1.33); Llz—cycle weighting step of main roof in fissure zone, general greater than 10 m, getting actual data for calculating, or getting 10 m without actual data.
High Yield and High Efficiency Synthesized Mechanical Mining Technology and Equipment.
Due to there is no experience of mechanical mining thin coal seam to use for reference in Liuquan Mine or surrounding mines, it has be a key problem to be solved in Liuquan Mine that exploring new technological approaches for Effective development and utilization of thin coal seam resources. 2.
Physico-mechanical properties of surrounding rock were determined refer to the actual rock mechanics properties of Liuquan Mine.
(3) The volume of prop able compression should be adaptable to main roof sinking in fracture zone The roof subsidence at maximum roof control distance Δh could be estimated as follow: Where, L'D—maximum roof control distance( distance from coal wall to timber wall, pier stud or last row props), m; H—subsidence of fissure zone in the position of main roof fault block contact with gangue, H=M-h(Kz-1)-h1(Kl-1), (where, M is mining height, Kz is bulking factor of immediate roof rock strata, 1.33~1.5, h is thickness of immediate roof, h1 is thickness of main roof in caving zone and additional rock strata, Kl is bulking factor of main roof in caving zone and additional rock strata, 1.15~1.33); Llz—cycle weighting step of main roof in fissure zone, general greater than 10 m, getting actual data for calculating, or getting 10 m without actual data.
High Yield and High Efficiency Synthesized Mechanical Mining Technology and Equipment.
Online since: July 2017
Authors: Horia Orban, Razvan Adam, Adrian Barbilian, Dan Voinescu, Elisa Plopeanu
From the orthopedic surgeon perspective, magnesium based implants shows superior mechanical properties compared to polymeric or composites implants that are now available for surgeons, and almost similar to mechanical values of bone.
Fig. 2 Corrosion process representation for magnesium-based alloys In order to improve the properties of magnesium, alloying with other elements in order to obtain magnesium alloys with superior properties represents the main option.
In the case of medical applications, the main requirement for alloying elements are biocompatibility of these elements, improvement of mechanical properties and modulate the biodegradation in human body environment [1, 9, 10].
All these elements have a different influence on the mechanical and physical properties of magnesium alloys.
Mechanical properties of Mg-Ca alloys can be adjusted by controlling the content of calcium and the processing treatments.
Fig. 2 Corrosion process representation for magnesium-based alloys In order to improve the properties of magnesium, alloying with other elements in order to obtain magnesium alloys with superior properties represents the main option.
In the case of medical applications, the main requirement for alloying elements are biocompatibility of these elements, improvement of mechanical properties and modulate the biodegradation in human body environment [1, 9, 10].
All these elements have a different influence on the mechanical and physical properties of magnesium alloys.
Mechanical properties of Mg-Ca alloys can be adjusted by controlling the content of calcium and the processing treatments.
Online since: December 2003
Authors: H.B. Liu, J.A. Ascencio
On the other hand, in order
to set up the link between microstructure and mechanical properties it is very important
to understand deformation and defect properties of metals at the atomistic level.
Based on the above mentioned factors, Liu et al.[17] study the configurations and its related behaviors of edge-dislocation for iron in bulk and nanoparticles.
Evidence shows that some attention has been given to the strong relations between electronic structures of dislocation cores and mechanical properties of materials.
THE ASPECT OF PHONON Lattice vibrations have great influences on thermal, acoustic, electric, optical and mechanical properties of materials.
For the existing defects, the thermodynamics properties of real materials, for example, free energy, vibrational entropy and heat capacity, are different from those of perfect crystal, which finally affect real materials physical and mechanical properties.
Based on the above mentioned factors, Liu et al.[17] study the configurations and its related behaviors of edge-dislocation for iron in bulk and nanoparticles.
Evidence shows that some attention has been given to the strong relations between electronic structures of dislocation cores and mechanical properties of materials.
THE ASPECT OF PHONON Lattice vibrations have great influences on thermal, acoustic, electric, optical and mechanical properties of materials.
For the existing defects, the thermodynamics properties of real materials, for example, free energy, vibrational entropy and heat capacity, are different from those of perfect crystal, which finally affect real materials physical and mechanical properties.
Online since: March 2010
Authors: Zheng Yi Jiang, Xiao Ping Zhang, Xiao Zhong Du, Quan Yang, Xiao Chen Wang
In recent years asymmetrical
rolling has become more important due to realization of improved properties of the strip.
In recent years asymmetrical rolling process has become more important due to realization of improved properties of the strip.
Jiang and coworker developed a modified influence function method model to analyze the work roll edge contact affects mechanics of asymmetrical rolling.
In this paper, the factor of profile control in asymmetric rolling is discussed in details.
Tieu: International Journal of Mechanical Science, Vol. 48(2006), p 697
In recent years asymmetrical rolling process has become more important due to realization of improved properties of the strip.
Jiang and coworker developed a modified influence function method model to analyze the work roll edge contact affects mechanics of asymmetrical rolling.
In this paper, the factor of profile control in asymmetric rolling is discussed in details.
Tieu: International Journal of Mechanical Science, Vol. 48(2006), p 697
Online since: December 2012
Authors: Shi Yun Dong, Bin Shi Xu, Li Hong Dong, Hui Peng Wang, Nan Xue
To explore a way to characterize fatigue damage degree of ferromagnetic materials by metal magnetic memory testing (MMMT), tension-compression fatigue test of specimens with different stress concentration factors made of 45% C steel were carried out.
The results show that, the gradient variation of Hp(y) signals during the fatigue test is similar to each other, but the gradient value is different due to the different stress concentration factors.
In this paper, tension-compression fatigue tests of specimens with different stress concentration factor were carried out.
It is promising to provide a new way for fatigue life evaluation of ferromagnetic materials by using 2-dementional magnetic memory signals. 1 Experimental 1.1 Specimen The test material of this study was 0.45% C steel, which has excellent mechanical property such as plasticity, stiffness, strength and so on.
The specimen with stress concentration factor 2 was named specimen 1, and that with stress concentration factor 5 was named specimen 2 for short, respectively. 2.1 Variation of Hp(y) during fatigue Hp(y) signals of specimen 1 and 2 under different fatigue cycles were shown in Fig. 2.
The results show that, the gradient variation of Hp(y) signals during the fatigue test is similar to each other, but the gradient value is different due to the different stress concentration factors.
In this paper, tension-compression fatigue tests of specimens with different stress concentration factor were carried out.
It is promising to provide a new way for fatigue life evaluation of ferromagnetic materials by using 2-dementional magnetic memory signals. 1 Experimental 1.1 Specimen The test material of this study was 0.45% C steel, which has excellent mechanical property such as plasticity, stiffness, strength and so on.
The specimen with stress concentration factor 2 was named specimen 1, and that with stress concentration factor 5 was named specimen 2 for short, respectively. 2.1 Variation of Hp(y) during fatigue Hp(y) signals of specimen 1 and 2 under different fatigue cycles were shown in Fig. 2.
Online since: July 2013
Authors: Huo Zhou, Chao Dong Ling, Bing Mo, Rong Hai Huang, Rui Ming Huang
Unlike the traditional mouse, the MEMS (Micro-Electro- Mechanical- Systems) mouse, as a new kind of human interface device, don’t need to rely on any plane.
Moreover, the accelerometer and magnetometer both are easily affected by the interference of the external environment, but their output data don’t change with time basically.
Based on the factors above and the characteristics of air-mouse, this paper proposes a new kind of information fusion algorithm that applies to the MWAMS.
Although Q is a four-dimensional vector, but its three imaginary numbers have the properties of three-dimensional vector.
At the same time, the sensitivity scale factor K which determines the ratio of mapping needs further optimize.
Moreover, the accelerometer and magnetometer both are easily affected by the interference of the external environment, but their output data don’t change with time basically.
Based on the factors above and the characteristics of air-mouse, this paper proposes a new kind of information fusion algorithm that applies to the MWAMS.
Although Q is a four-dimensional vector, but its three imaginary numbers have the properties of three-dimensional vector.
At the same time, the sensitivity scale factor K which determines the ratio of mapping needs further optimize.