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Online since: November 2014
Authors: Jie Yang, Wen Yuan Zhang, Chang Ling Zhou, Rui Xiang Liu, Xue Ye Sui, Chong Hai Wang
K1 respectively stands for the factors of A, B and C and the first level of effect on the voltage breakdown.
The effect of C factors (the quality of the sodium fluoride) on the voltage breakdown is the largest.
Factors also can be seen from table1 C of the three levels of voltage breakdown of the third level corresponds to the average value maximum, so C factors was picked up third level.
[9] Chung Hyunsoo, Lee Jonghwae, Jang Won bong, Thermal Properties of Polyimide Thin Films Depending on Different Curing Process.
Hascieek, Electrical properties of High Temperature Insulation Coating by the Sol-Gel Method for magnet Technolgy.
The effect of C factors (the quality of the sodium fluoride) on the voltage breakdown is the largest.
Factors also can be seen from table1 C of the three levels of voltage breakdown of the third level corresponds to the average value maximum, so C factors was picked up third level.
[9] Chung Hyunsoo, Lee Jonghwae, Jang Won bong, Thermal Properties of Polyimide Thin Films Depending on Different Curing Process.
Hascieek, Electrical properties of High Temperature Insulation Coating by the Sol-Gel Method for magnet Technolgy.
Online since: May 2011
Authors: Yu Liang Qiu, Xiao Yong Hu, Xiao Xu Zhang, Wei Hua Dong, Bao Wen Kou
Based on the simplified model, seismic waves are applied at the bottom of bedrock, with the dynamic properties of soil and the interaction between ground and tunnel are considered.
Soil spring stiffness values are determined according to the survey report and experience, considering foundation treatment and rock properties of different tubes as well.
Free-field boundary field provides the same effect with the infinite region, which is to“enforce”the free-field motion in such a way that boundaries retain their non-reflecting properties-i.e., outward waves originating from the structure are properly absorbed.
From the perspective of internal forces, flexible foundation can improve the mechanical properties of the tunnel; however, the decrease of the foundation stiffness will inevitably lead to increases of the deformation of tunnel.
(4) Transverse Dynamic analysis of tunnel shows that, the connection parts of floor, wall and the connection parts of roof and wall are the most disadvantageous position during the earthquake, so, as one of the controlling factors in tunnel design these parts’ design strength should be strengthened and deformation control should be taken.
Soil spring stiffness values are determined according to the survey report and experience, considering foundation treatment and rock properties of different tubes as well.
Free-field boundary field provides the same effect with the infinite region, which is to“enforce”the free-field motion in such a way that boundaries retain their non-reflecting properties-i.e., outward waves originating from the structure are properly absorbed.
From the perspective of internal forces, flexible foundation can improve the mechanical properties of the tunnel; however, the decrease of the foundation stiffness will inevitably lead to increases of the deformation of tunnel.
(4) Transverse Dynamic analysis of tunnel shows that, the connection parts of floor, wall and the connection parts of roof and wall are the most disadvantageous position during the earthquake, so, as one of the controlling factors in tunnel design these parts’ design strength should be strengthened and deformation control should be taken.
Online since: July 2012
Authors: Zu Liang Liu, Xiao Dong Xing, Hai Tao Fan, Man Hu, Li Xia Li
The properties of the gel were subsequently investigated by DSC, UV-vis, and gravimetry.
In all the stimulus factors, light has been taken into account as an external stimulus to induce the phase separation because of its ready accessibility and chemical purity.
The properties of the hydrogel were subsequently studied carefully.
The studies result showed that a small amount of M was enough to make the gel light-sensitive, which will obviously less affect the main properties attributed to NIPAm units of the gels.
Irie, Properties and applications of photoresponsive.
In all the stimulus factors, light has been taken into account as an external stimulus to induce the phase separation because of its ready accessibility and chemical purity.
The properties of the hydrogel were subsequently studied carefully.
The studies result showed that a small amount of M was enough to make the gel light-sensitive, which will obviously less affect the main properties attributed to NIPAm units of the gels.
Irie, Properties and applications of photoresponsive.
Online since: May 2012
Authors: Sheng Jie Deng, Yong Feng Chen, Ce Xu, Jian Yuan Liao, Zhen Chen, Chang You Li, Feng Ying Xu
To learn about banana microstructure changes on affecting moisture dehydration performance and its quality during oven drying process, this experiment chose scanning electron microscopy to observe the microstructure changes on outer surface, inner surface and cross section of banana peel and its flesh during drying process, in order to examine the relationship between dehydration performance and its microstructure shape and microstructure pore structures changes.
Introduction Drying is a process with material moisture evaporating by thermal action, this process is often associated with material physical and chemical properties changes[1].
Banana (Musa paradisiaca ) drying process can reduce mechanical damage for fresh fruit, easy for storage and transportation.
Some researchers studied on dehydration performance and quality changes during banana drying process on temperatures, they found banana flesh microstructure changed obviously during drying, all these researches mainly focus on fruit dry product microstructure contrast [6-7], while pay less attention to microstructure changes affecting moisture evaporating resistance or drying quality relationship research[8-9], so still needs to be further study.
This was mainly factor that lead to peel and flesh moisture dehydration performance and quality decreased on drying.
Introduction Drying is a process with material moisture evaporating by thermal action, this process is often associated with material physical and chemical properties changes[1].
Banana (Musa paradisiaca ) drying process can reduce mechanical damage for fresh fruit, easy for storage and transportation.
Some researchers studied on dehydration performance and quality changes during banana drying process on temperatures, they found banana flesh microstructure changed obviously during drying, all these researches mainly focus on fruit dry product microstructure contrast [6-7], while pay less attention to microstructure changes affecting moisture evaporating resistance or drying quality relationship research[8-9], so still needs to be further study.
This was mainly factor that lead to peel and flesh moisture dehydration performance and quality decreased on drying.
Online since: January 2021
Authors: Seetharaman Sivaprasad, Swapna Dey, Indranil Chattoraj, Nityananda Das
Hydrogen promoted degradation is one of the limiting factors to the structural integrity of the pipelines in long term service.
Therefore, it is essential to assess the hydrogen diffusion rate in the pipeline steels to predict their mechanical properties in service life.
The diffusion of hydrogen in steels is also affected by the microstructure of the steel.
The effect of different microstructures on the efficiency of hydrogen trapping in X65 pipeline steel was investigated by Park et al. [13] and reported that microstructures affecting both hydrogen trapping and hydrogen diffusion behavior and the trapping efficiency increases from pearlite to bainite followed by acicular ferrite.
The permeation current provides significant factors of hydrogen diffusion and trapping, viz.
Therefore, it is essential to assess the hydrogen diffusion rate in the pipeline steels to predict their mechanical properties in service life.
The diffusion of hydrogen in steels is also affected by the microstructure of the steel.
The effect of different microstructures on the efficiency of hydrogen trapping in X65 pipeline steel was investigated by Park et al. [13] and reported that microstructures affecting both hydrogen trapping and hydrogen diffusion behavior and the trapping efficiency increases from pearlite to bainite followed by acicular ferrite.
The permeation current provides significant factors of hydrogen diffusion and trapping, viz.
Online since: May 2016
Authors: Jariah Mohd Juoi, Muharniza Azinita Musa, M.R. Zulkifli, Norashidah Masrom
Among the key factors that affect the formation of metal oxides, which consequently influence the performance of thin film prepared via sol-gel method, are: pH of the reaction solution, hydrolysis ratio, type of solvent and reaction temperature.
Pongpom, Sol-gel preparation and properties study of TiO2 thin film for photocatalytic reduction of chromium (VI) in photocatalysis process, Sci.
Søgaard, Sol-gel reactions of titanium alkoxides and water: influence of pH and alkoxy group on cluster formation and properties of the resulting products, J.
Mohammadizadeh, Simultaneous improvement of photocatalytic and superhydrophilicity properties of nano TiO2 thin films, Chem.
Dionysiou, A comparative study on physicochemical properties and photocatalytic behavior of macroporous TiO2-P25 composite films and macroporous TiO2 films coated on stainless steel substrate, Appl.
Pongpom, Sol-gel preparation and properties study of TiO2 thin film for photocatalytic reduction of chromium (VI) in photocatalysis process, Sci.
Søgaard, Sol-gel reactions of titanium alkoxides and water: influence of pH and alkoxy group on cluster formation and properties of the resulting products, J.
Mohammadizadeh, Simultaneous improvement of photocatalytic and superhydrophilicity properties of nano TiO2 thin films, Chem.
Dionysiou, A comparative study on physicochemical properties and photocatalytic behavior of macroporous TiO2-P25 composite films and macroporous TiO2 films coated on stainless steel substrate, Appl.
Online since: April 2014
Authors: Lei Wang, Xiu Song, Yang Liu, Dan Yuan, Jia Hua Liu
The tensile properties of SA508-Ⅲ steel at different strain rate.
Fig. 2 Metallographic microstructure of SA508-III steel Fig. 3 Stress - strain curves of SA508-Ⅲ steel with different strain rates at 350 ℃ Table 3 shows the tensile properties of SA508-Ⅲ steel with different strain rates at 350 ℃, and the Fig. 4 is drawn according to the data in Table 3.
Table 3 Tensile properties of SA508-Ⅲ steel with different strain rates at 350 ℃ ,s-1 ,MPa ,MPa ,% ,% 1×10-4 401.2 558.0 23.7 77.1 6×10-4 383.6 546.9 20.8 77.5 1×10-3 404.3 554.8 20.8 75.8 1×10-2 426.9 524.3 18.3 71.9 1×10-1 366.7 506.6 20.1 77.0 Fig. 4 Tensile properties of SA508-Ⅲ steel at different strain rates: (a) yield strength; (b) tensile strength; (c) reduction in area; (d) elongation SEM photographs of the fracture surface.
There are many factors affecting the dimple size, such as the density of the second phase, the plastic deformation of matrix and the strain hardening exponent.
[2] ASME, Boiler and pressure vessel code section III, American Society of Mechanical Engineers, New York, 1989
Fig. 2 Metallographic microstructure of SA508-III steel Fig. 3 Stress - strain curves of SA508-Ⅲ steel with different strain rates at 350 ℃ Table 3 shows the tensile properties of SA508-Ⅲ steel with different strain rates at 350 ℃, and the Fig. 4 is drawn according to the data in Table 3.
Table 3 Tensile properties of SA508-Ⅲ steel with different strain rates at 350 ℃ ,s-1 ,MPa ,MPa ,% ,% 1×10-4 401.2 558.0 23.7 77.1 6×10-4 383.6 546.9 20.8 77.5 1×10-3 404.3 554.8 20.8 75.8 1×10-2 426.9 524.3 18.3 71.9 1×10-1 366.7 506.6 20.1 77.0 Fig. 4 Tensile properties of SA508-Ⅲ steel at different strain rates: (a) yield strength; (b) tensile strength; (c) reduction in area; (d) elongation SEM photographs of the fracture surface.
There are many factors affecting the dimple size, such as the density of the second phase, the plastic deformation of matrix and the strain hardening exponent.
[2] ASME, Boiler and pressure vessel code section III, American Society of Mechanical Engineers, New York, 1989
Online since: May 2012
Authors: Xiu Fen Li, Hui Qin Chen
Some points needed to consider in Experimental design
The index determination of Experimental study :
In general, cement performance measurement projects includes many [1].For insoluble residue, ignition loss quantity, magnesium oxide, sulphur trioxide and alkali content, because such factors as the nanometer kaolin than kaolin, slant kaolin purity higher and kaolinite and partial kaolin can join in cement, such index comply with cement requirements.
Water requirement is likely the important indexes which affect Nano-kaolin mixed to cement, as Nano mineral has high specific surface, contrasting nano-silica cement test, this is the important reason to increase Water requirement.
The compressive flexural strength, the anti-permeability and corrosion resistance performance of coking properties and anti-freeze properties are important index in cement industry, hereinto, compressive strength, flexural strength is the most basic index, so this paper finally determined compressive flexural strength to arrange test, and anti-permeability, corrosion resistance, resistance to the carbonization and anti-freeze properties as a follow-up tests arrangement.
Finally, this paper finally determined water demand, setting time and flexural strength as the main factors.
Nano-Kaolin’s dispersibility: Nano-kaolin scattered to cement particles need to choose a good dispersion method to better improve the distributed quality and improve the mechanical properties of scattere system[2].Considering the nano kaolin in water have very good dispersion, water is the raw material to make cement colloid, and also in cement colloid and concrete preparation process use mechanical agitation,so this paper adopt a method combed physics and chemistry, is also a kind of simple easy to implement method: First, the nano-kaolin is scattered to the water, fully mixing make nano-kaolin dispersed in water even, and then in the cement colloid fabrication process, nano-kaolin is joined in cement with the water together, and extend the cement colloid mixing time, get a good dispersion effect, make the nano-kaolin maximum limit in cement fully scattered.
Water requirement is likely the important indexes which affect Nano-kaolin mixed to cement, as Nano mineral has high specific surface, contrasting nano-silica cement test, this is the important reason to increase Water requirement.
The compressive flexural strength, the anti-permeability and corrosion resistance performance of coking properties and anti-freeze properties are important index in cement industry, hereinto, compressive strength, flexural strength is the most basic index, so this paper finally determined compressive flexural strength to arrange test, and anti-permeability, corrosion resistance, resistance to the carbonization and anti-freeze properties as a follow-up tests arrangement.
Finally, this paper finally determined water demand, setting time and flexural strength as the main factors.
Nano-Kaolin’s dispersibility: Nano-kaolin scattered to cement particles need to choose a good dispersion method to better improve the distributed quality and improve the mechanical properties of scattere system[2].Considering the nano kaolin in water have very good dispersion, water is the raw material to make cement colloid, and also in cement colloid and concrete preparation process use mechanical agitation,so this paper adopt a method combed physics and chemistry, is also a kind of simple easy to implement method: First, the nano-kaolin is scattered to the water, fully mixing make nano-kaolin dispersed in water even, and then in the cement colloid fabrication process, nano-kaolin is joined in cement with the water together, and extend the cement colloid mixing time, get a good dispersion effect, make the nano-kaolin maximum limit in cement fully scattered.
Online since: November 2012
Authors: Ying Yao, Xue Li Chen, Xiao Ling Zhu
This paper proposes a bridge health monitoring system based on wireless sensor network, which collects information of each mechanical part of the bridge.
This paper proposes a bridge health monitoring system based on wireless sensor network, which is thought to be one of the important technologies affecting human life in the future.
When a bridge happens mechanical deformation under external force, its resistance value produces corresponding change, this physical phenomenon is known as resistance strain effect of resistance wire.
It is a sensor that can convert specimens' mechanical strain change to its resistance change, that is to say the resistance strain gauge is a force-electricity convert component.
Others factors like high data throughput rate, processing power, as well as the requirement of a number of general I / O control ports must be taken into accounts when choosing the processor.
This paper proposes a bridge health monitoring system based on wireless sensor network, which is thought to be one of the important technologies affecting human life in the future.
When a bridge happens mechanical deformation under external force, its resistance value produces corresponding change, this physical phenomenon is known as resistance strain effect of resistance wire.
It is a sensor that can convert specimens' mechanical strain change to its resistance change, that is to say the resistance strain gauge is a force-electricity convert component.
Others factors like high data throughput rate, processing power, as well as the requirement of a number of general I / O control ports must be taken into accounts when choosing the processor.
Online since: January 2019
Authors: Gang Chen, Seng Peng, Xiao Bin Tang, Hao Wang, Yan Wei
Therefore, it is very important to minimize the adverse effects of wax on the flow properties of crude oil[7].
Many ways are available in practice, which include blending with lighter oil, stream heating, mechanical scraping and use of chemical additives [8].
Results and Discussion The four crude oil samples were produced from Henan Oil Field of China, and the main properties were shown in Table 2.
Effect of wax inhibitors on pour point and rheological properties of Iranian waxy crude oil.
[14] Lucas A.G., Modern petroleum technology, John Wiley and Sons, Ltd., England. (2000) [15] Manka J.S., Ziegler K.L., Factors affecting the performance of crude oil wax-control additives, SPE 67326.
Many ways are available in practice, which include blending with lighter oil, stream heating, mechanical scraping and use of chemical additives [8].
Results and Discussion The four crude oil samples were produced from Henan Oil Field of China, and the main properties were shown in Table 2.
Effect of wax inhibitors on pour point and rheological properties of Iranian waxy crude oil.
[14] Lucas A.G., Modern petroleum technology, John Wiley and Sons, Ltd., England. (2000) [15] Manka J.S., Ziegler K.L., Factors affecting the performance of crude oil wax-control additives, SPE 67326.