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Online since: April 2014
Authors: Wei Wei An, Xiao Li Zhao, Hai Chao Yu, Zhan Shan Liu
These micro-wrinkles cause unique mechanical, optical, electronic and other properties due to wave interference phenomena [3-4].
Due to its rich chemical composition, ginkgo biloba has many unique properties and a wide range of applications including drug development, ancient climate research, and biogenetics [12-14].
Studies have been carried out to fully characterize the wetting properties of ginkgo leaves by measuring CA and roll-off angle with the deionized water.
Previous study indicated that the main factors affecting the wetting properties were surface roughness and wax [11].
Stafford, Surface wrinkling: A versatile platform for measuring thin-film properties, Advanced Materials, Vol. 23, Issue 3 (2011) pp. 349–368
Due to its rich chemical composition, ginkgo biloba has many unique properties and a wide range of applications including drug development, ancient climate research, and biogenetics [12-14].
Studies have been carried out to fully characterize the wetting properties of ginkgo leaves by measuring CA and roll-off angle with the deionized water.
Previous study indicated that the main factors affecting the wetting properties were surface roughness and wax [11].
Stafford, Surface wrinkling: A versatile platform for measuring thin-film properties, Advanced Materials, Vol. 23, Issue 3 (2011) pp. 349–368
Online since: October 2014
Authors: Chun Yan Jiang, Shu Zheng Liu, Yu Hua Zhang, Ai Qing Zhang, Fan Di Zeng, Cheng Yan
More finger-like pores of the hybrid membranes were obtained after adding Ru nanocluster, and the thermal properties of the membranes increased while the mechanical properties decreased.
Thermal properties.
TGA spectra of PSF and PSF/ Ru hybrid hollow fiber membranes Mechanical properties.
These factors decreasing the mechanical properties of the hybrid membranes.
The thermal and mechanical properties were also changed, after adding Ru nanocluster, the thermal properties of the membranes increased while the mechanical properties decreased.
Thermal properties.
TGA spectra of PSF and PSF/ Ru hybrid hollow fiber membranes Mechanical properties.
These factors decreasing the mechanical properties of the hybrid membranes.
The thermal and mechanical properties were also changed, after adding Ru nanocluster, the thermal properties of the membranes increased while the mechanical properties decreased.
Online since: November 2011
Authors: Yi Biao Sun, Yi Na Wang, Jia Kuan Xia
Common positioning systems based on permanent magnet linear synchronous motor (PMLSM) normally use mechanical bearings.
Invariably, the servo performance is affected by the friction, elastic deformation; vibration and dust result from the actions of the motor with mechanical bearings.
The focus of this paper is to study the forces and theoretical properties of the device, set up its state equation and design a nonlinear controller capable of set-point stabilization.
Then, for a prespecified , the stabilizing controller is found to satisfy the inequality as follows (18) where (19) Furthermore, for the augmented plant Gs defined in (15), coprime factors of can be found by (20) (21) where Fig7.
Weights are selected by the characteristics that we1 play a major role in the low frequency and affect the tracking performance of closed-loop system; We2 reflect the affects intensity of disturbances; wu reflect the affects intensity of control signal.
Invariably, the servo performance is affected by the friction, elastic deformation; vibration and dust result from the actions of the motor with mechanical bearings.
The focus of this paper is to study the forces and theoretical properties of the device, set up its state equation and design a nonlinear controller capable of set-point stabilization.
Then, for a prespecified , the stabilizing controller is found to satisfy the inequality as follows (18) where (19) Furthermore, for the augmented plant Gs defined in (15), coprime factors of can be found by (20) (21) where Fig7.
Weights are selected by the characteristics that we1 play a major role in the low frequency and affect the tracking performance of closed-loop system; We2 reflect the affects intensity of disturbances; wu reflect the affects intensity of control signal.
Online since: August 2011
Authors: Ming Zhang, Min Xian Shi, Zhuo Chen, Zhi Xiong Huang, Qi Lin Mei, Yan Qin
The experimental results show the microballoons size doesn’t influent the mechanical properties of the syntactic foam significantly.
Syntactic foams are quite different from the conventional foams for they have a close cell structure, which can gain better mechanical performance and controllable property [7-8].
The volume percentage of the microballoons in the syntactic foams had been proved to be an important factor to the mechanical properties of the syntactic foams [9].It is observed that, the density and strength of the syntactic foams decreases with an increasing volume fraction of the microballoons.
Kishore, Ravi Shankar et al investigated the effect microballoons’ size distribution on the mechanical properties of syntactic foams [12], and they found that compressive strength of syntactic foams which having microballoons with narrower size distribution and smaller size is higher.
Because of the different properties of the epoxy resin and glass, the deformation of the matrix and glass microballoons is differed.
Syntactic foams are quite different from the conventional foams for they have a close cell structure, which can gain better mechanical performance and controllable property [7-8].
The volume percentage of the microballoons in the syntactic foams had been proved to be an important factor to the mechanical properties of the syntactic foams [9].It is observed that, the density and strength of the syntactic foams decreases with an increasing volume fraction of the microballoons.
Kishore, Ravi Shankar et al investigated the effect microballoons’ size distribution on the mechanical properties of syntactic foams [12], and they found that compressive strength of syntactic foams which having microballoons with narrower size distribution and smaller size is higher.
Because of the different properties of the epoxy resin and glass, the deformation of the matrix and glass microballoons is differed.
Online since: November 2013
Authors: Ming Chen, Zhen Zhang, Yang Xu, Tao Wang
Reasonable design of oil tank and study of oil tank fire extinguishing introducing new method are very important to property safety and social stability.
Vehicle safety monitoring is studied and we analyze and summarize the many factors that affect vehicle safety, and practicality of extracting a representative vehicle safety monitoring technology, analytics implementations.
Mao: Mechanical properties of Jintan mine rock salt under complex stress paths, International Journal of Rock Mechanics and Mining Sciences, Vol.56(2012), p.54-61
Vehicle safety monitoring is studied and we analyze and summarize the many factors that affect vehicle safety, and practicality of extracting a representative vehicle safety monitoring technology, analytics implementations.
Mao: Mechanical properties of Jintan mine rock salt under complex stress paths, International Journal of Rock Mechanics and Mining Sciences, Vol.56(2012), p.54-61
Online since: July 2011
Authors: Ying Zhang, Xian Jiao Xie, Jin Yu He, De Fu Li, Wen Sheng Sun, Mao Peng Geng, Shui Sheng Xie, Guo Rui Jia
The wide range between the solidus and liquidus makes the shrinkage porosity prone to happen during solidification, thus affecting the casting quality seriously.
Besides, it can also help to analyse the relationship between the factors and indicators, find how the factors influence the indicators, find the main factor and secondary factor, and find the optimized combination of all the factors investigated.
During casting Process, many factors have impact on the generation of Shrinkage porosity, orthogonal L 9 (3 4)t was selected in this paper , Three different factors were discussed, casting temperature, mold temperature and mold preheating heat transfer coefficient with the surrounding environment, three values for each factor were selected for simulation..
Fig. 1 Perspective pictures of shrinkage porosity in the zinc alloy ingots Conclusion It could be concluded From the intuitive factor table: the range of the transfer coefficient was maximum, preheating temperature was the second, followed by casting temperature, and the range of heat transfer coefficient is much larger than the value of the other two factors, suggesting that In this study, the heat transfer coefficient was the main influencing factor for shrinkage of zinc-aluminum alloy ingot, their important order was: heat transfer coefficient, pouring temperature and mold preheating temperature.
Engineering Properties of Zinc Alloys.
Besides, it can also help to analyse the relationship between the factors and indicators, find how the factors influence the indicators, find the main factor and secondary factor, and find the optimized combination of all the factors investigated.
During casting Process, many factors have impact on the generation of Shrinkage porosity, orthogonal L 9 (3 4)t was selected in this paper , Three different factors were discussed, casting temperature, mold temperature and mold preheating heat transfer coefficient with the surrounding environment, three values for each factor were selected for simulation..
Fig. 1 Perspective pictures of shrinkage porosity in the zinc alloy ingots Conclusion It could be concluded From the intuitive factor table: the range of the transfer coefficient was maximum, preheating temperature was the second, followed by casting temperature, and the range of heat transfer coefficient is much larger than the value of the other two factors, suggesting that In this study, the heat transfer coefficient was the main influencing factor for shrinkage of zinc-aluminum alloy ingot, their important order was: heat transfer coefficient, pouring temperature and mold preheating temperature.
Engineering Properties of Zinc Alloys.
Online since: August 2008
Authors: Claudinei dos Santos, M.A. Lanna, Cosme Roberto Moreira Silva, A.M. Abrão, F. Levy Neto
Keywords: Ceramic; Cutting Tools; Composites; SiAlON;
Introduction
There is a significant increase on use of silicon nitride (Si3N4) based ceramics as structural materials
as a result of their excellent mechanical and chemical properties [1-2].
However, the secondary intergranular phase is detrimental to the high temperature mechanical properties due to softening.
Carbon Fiber Reinforced Carbon (CFRC) composites are widely employed in aerospace and nuclear industries, as a result of their excellent thermo-mechanical properties in non-oxidizing atmospheres, high chemical inertness and relatively low density [6].
Mechanical Properties The average hardness of sintered ceramic cutting tool was 20 GPa, and this value is related to the high volume fraction of extremely hard α-SiAlON particles.
Case study: Factors affecting microstructure and Properties of Silicon nitride; p. 285-304 in Materials Science of Carbides, Nitrides and Borides"; Edited by Y.G.Gogotsi, and R.A.Andreievski, Kluer Academic Publishers, Netherlands, (1999)
However, the secondary intergranular phase is detrimental to the high temperature mechanical properties due to softening.
Carbon Fiber Reinforced Carbon (CFRC) composites are widely employed in aerospace and nuclear industries, as a result of their excellent thermo-mechanical properties in non-oxidizing atmospheres, high chemical inertness and relatively low density [6].
Mechanical Properties The average hardness of sintered ceramic cutting tool was 20 GPa, and this value is related to the high volume fraction of extremely hard α-SiAlON particles.
Case study: Factors affecting microstructure and Properties of Silicon nitride; p. 285-304 in Materials Science of Carbides, Nitrides and Borides"; Edited by Y.G.Gogotsi, and R.A.Andreievski, Kluer Academic Publishers, Netherlands, (1999)
Online since: September 2013
Authors: Li Ping Pang, Ying Jie Wang, Dong Sheng Yang
Passenger thermal comfort is one significant aspect in cabin-related issues and it has become a key market competition factor for the civil airline industry.
The reduction of cabin pressure and very low RH at cruise altitude will affect several terms in the bio-heat balance equation.
We assume that the static theory of thermal comfort can be applied to the civil aircraft cabin and all the properties of the individual tissue as well as the insulation properties of garments worn are independent of the air pressure [5], air pressure and RH will mainly impact on the heat loss through skin diffusion and sweating, and heat loss by convection. 1) Heat loss through skin diffusion and sweating The evaporative heat loss from skin (Esk) is defined as [6]: (2) where w is the skin wettedness; Re is clothing water vapour resistance, m2Pa/W; pa is water vapour pressure, Pa; is the saturated water vapour pressure at the skin temperature, Pa
Such a low RH is believed to affect the basal wettedness of the skin, having a normal value of 0.06 which may drop to values as low as 0.02 in a very dry environment.
Personal factors in thermal comfort assessment: clothing properties and metabolic heat production.
The reduction of cabin pressure and very low RH at cruise altitude will affect several terms in the bio-heat balance equation.
We assume that the static theory of thermal comfort can be applied to the civil aircraft cabin and all the properties of the individual tissue as well as the insulation properties of garments worn are independent of the air pressure [5], air pressure and RH will mainly impact on the heat loss through skin diffusion and sweating, and heat loss by convection. 1) Heat loss through skin diffusion and sweating The evaporative heat loss from skin (Esk) is defined as [6]: (2) where w is the skin wettedness; Re is clothing water vapour resistance, m2Pa/W; pa is water vapour pressure, Pa; is the saturated water vapour pressure at the skin temperature, Pa
Such a low RH is believed to affect the basal wettedness of the skin, having a normal value of 0.06 which may drop to values as low as 0.02 in a very dry environment.
Personal factors in thermal comfort assessment: clothing properties and metabolic heat production.
Online since: July 2014
Authors: K.R. Balasubramanian, S.P. Sivapirakasham, Jiss Mathew
K R Balasubramanian1, a,Dr.S P Sivapirakasam2, b, Jiss Mathew3, c
1, 2, 3, 4Department of Mechanical Engineering, National Institute of Technology,
Tiruchirappalli-620 015, Tamil Nadu, India.
They offer superior insulating properties but how ageing and exposure could affect their insulation properties is a matter of concern.2 The traditional testing methods like insulation testing could only test whether the present properties are satisfactory.
The onset temperature reduced significantly with increase in both, duration of exposure and strength of exposure Exothermic Onset Temperature 0C Fig 4.2 Exothermic onset temperatures at different chemical exposures CONCLUSION Various factors contributing to insulation failures have been studied with special emphasis on insulation failures due to chemical interaction.
They offer superior insulating properties but how ageing and exposure could affect their insulation properties is a matter of concern.2 The traditional testing methods like insulation testing could only test whether the present properties are satisfactory.
The onset temperature reduced significantly with increase in both, duration of exposure and strength of exposure Exothermic Onset Temperature 0C Fig 4.2 Exothermic onset temperatures at different chemical exposures CONCLUSION Various factors contributing to insulation failures have been studied with special emphasis on insulation failures due to chemical interaction.
Online since: October 2012
Authors: Fa Shen, Yong Qi, Wen Fei Peng
Some data indicate that the presence of Weld mechanical properties of ABS products may have about the loss of 10%—30%,PMMA, PS and other products about the loss of more than 30%.
Influential factors of the weld line The functional structure of plastic products.
There are many factors such as various types of inserts, holes, grooves structures, which will produce flow branches.
As a consequence, the weld strength will be affected seriously.
Moreover, vertical gate in Fig. 3 weld lines not only affects the appearance, but also affects the strength of the product.
Influential factors of the weld line The functional structure of plastic products.
There are many factors such as various types of inserts, holes, grooves structures, which will produce flow branches.
As a consequence, the weld strength will be affected seriously.
Moreover, vertical gate in Fig. 3 weld lines not only affects the appearance, but also affects the strength of the product.