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Online since: May 2011
Authors: Yuan Xun Zheng, Ying Chun Cai, Ya Min Zhang
But as a kind of temperature susceptibility material, its mechanical properties change with temperatures, and different temperature conditions would lead to various damage forms, such as low-temperature crack, high-temperature rut et al.
Besides, fatigue life of pavement is also affected by temperature [1-5].
For these reasons, it is irrational to estimate asphalt mixtures properties and design pavement structure without thinking about the effect of temperature.
Thinking about air temperature is the key influence factor to pavement temperature filed, and the rangeability of other climatic properties such as wind speed ,humidity and etc are slight during experiment period in Zhengzhou area, so in this paper just thinking about the air temperature influence to asphalt concrete pavement temperature field.
To further verify the universal property of the model and at the same time to compare to BELLS2 for precision, two prediction model were used to predicted asphalt pavement in different seasons, various structures depth and so on for more than 5,000 estimated sample values respectively, and predicted results were compared and analyzed , the results were shown as Fig.3.
Besides, fatigue life of pavement is also affected by temperature [1-5].
For these reasons, it is irrational to estimate asphalt mixtures properties and design pavement structure without thinking about the effect of temperature.
Thinking about air temperature is the key influence factor to pavement temperature filed, and the rangeability of other climatic properties such as wind speed ,humidity and etc are slight during experiment period in Zhengzhou area, so in this paper just thinking about the air temperature influence to asphalt concrete pavement temperature field.
To further verify the universal property of the model and at the same time to compare to BELLS2 for precision, two prediction model were used to predicted asphalt pavement in different seasons, various structures depth and so on for more than 5,000 estimated sample values respectively, and predicted results were compared and analyzed , the results were shown as Fig.3.
Online since: December 2010
Authors: Guo Xiang Yang, Jin Yu Dong, Fa Quan Wu, Ji Hong Yang, Dong Wang
Stability of these high cutting slopes influences safety of people’s life and property.
From the perspective of rock mechanics and mineralogy, Lu feng etc. studied the failure mechanism of high cutting slope with Jurassic, the mechanism was generalized into three geological model[1]; Yin Yueping had defined the slope structure type as bedding slope, slope with horizontal soft-hard strata, accumulation slope of slump-mass, solution-collapse breccia slope and layered cataclastic slope[2]; Zhu Jiewang put forward that the influencing factors on failure mechanism of high cutting slope in Wanzhou are the composition materials of slope and the properties, the hydrological and meteorological conditions, slope shape and treatment time etc., and according to these factors, failure modes of slope was classified into collapse failure, superficial weathering failure, differential weathering failure and collapse and sliding failure of soil body[3].
This paper analyzed the influencing factors of stability and failure modes of the high cutting slope with horizontal soft-hard rock.
Conclusions Association characters of soft and hard rock, differential weathering, water and the special geomorphic are the main factors that influence sliding mode of high cutting slope in Three Gorges area.
Mechanical model and failure mechanism of layered slope[J].
From the perspective of rock mechanics and mineralogy, Lu feng etc. studied the failure mechanism of high cutting slope with Jurassic, the mechanism was generalized into three geological model[1]; Yin Yueping had defined the slope structure type as bedding slope, slope with horizontal soft-hard strata, accumulation slope of slump-mass, solution-collapse breccia slope and layered cataclastic slope[2]; Zhu Jiewang put forward that the influencing factors on failure mechanism of high cutting slope in Wanzhou are the composition materials of slope and the properties, the hydrological and meteorological conditions, slope shape and treatment time etc., and according to these factors, failure modes of slope was classified into collapse failure, superficial weathering failure, differential weathering failure and collapse and sliding failure of soil body[3].
This paper analyzed the influencing factors of stability and failure modes of the high cutting slope with horizontal soft-hard rock.
Conclusions Association characters of soft and hard rock, differential weathering, water and the special geomorphic are the main factors that influence sliding mode of high cutting slope in Three Gorges area.
Mechanical model and failure mechanism of layered slope[J].
Online since: May 2011
Authors: Xin Wei Ma, Li Xiong Yang, Yu Yan Ji
Changing the arrangement of holes in the blocks will greatly affect the thermal conductivity of blocks [4].
Therefore, lightweight concrete has superior properties such as lightness in weight, and good thermal insulation, but has a disadvantage of low mechanical properties which makes them suitable only as non-load-bearing walls The mixture proportion of the concrete for the shell is shown in table 1.
The thermal conductivity of an insulating material does not only depend on its density and temperature, but also depends on moisture content and other factors [8].
Research on improving the heat insulation and preservation properties of small-size concrete hollow blocks.
Measurements of thermal properties of insulation materials by using transient plane source technique.
Therefore, lightweight concrete has superior properties such as lightness in weight, and good thermal insulation, but has a disadvantage of low mechanical properties which makes them suitable only as non-load-bearing walls The mixture proportion of the concrete for the shell is shown in table 1.
The thermal conductivity of an insulating material does not only depend on its density and temperature, but also depends on moisture content and other factors [8].
Research on improving the heat insulation and preservation properties of small-size concrete hollow blocks.
Measurements of thermal properties of insulation materials by using transient plane source technique.
Online since: May 2015
Authors: Irina Beşliu, Laurenţiu Slătineanu, Margareta Coteaţă, Maria Cristina Morar
As factors able to influence the dimensions of the groove, they considered the incident power, the scanning speed and the spot diameter.
Riveiro et al. noticed that due to the different properties between carbon fibers and the epoxy matrix, significant difficulties appear during laser beam cutting of carbon fiber reinforced plastic composite [5].
They succeeded to find adequate processing parameters so that the thickness of heat affected zone was minimal and there were not delaminations or protruding fibers.
The main properties of technical interest [6] of Plexiglas are the good mechanical properties, easy processing and relatively low cost.
Phenomena in Plexiglas test sample under the action of the laser beam The laser beam is composed of subatomic particles (photons) found in motion in a beam having specific properties (monochromaticity, directivity, coherence, intensity etc.).
Riveiro et al. noticed that due to the different properties between carbon fibers and the epoxy matrix, significant difficulties appear during laser beam cutting of carbon fiber reinforced plastic composite [5].
They succeeded to find adequate processing parameters so that the thickness of heat affected zone was minimal and there were not delaminations or protruding fibers.
The main properties of technical interest [6] of Plexiglas are the good mechanical properties, easy processing and relatively low cost.
Phenomena in Plexiglas test sample under the action of the laser beam The laser beam is composed of subatomic particles (photons) found in motion in a beam having specific properties (monochromaticity, directivity, coherence, intensity etc.).
Online since: October 2007
Authors: M. Kogawara, Michiharu Narazaki, A. Sugianto
Computer simulation can be utilized to predict the property and quality of heat-treated
products.
However, this technique has a detrimental effect on the non-uniform cooling that is believed to be a contributing factor to the non-uniform distortion.
Peak of HTC derived from S45C cylinder is higher than that from SUS304 cylinder, mainly due to the difference in the thermal property between them.
Different employed HTC will affect on the total strain causing different radial distortion.
By analyzing each strain data, the most contributing factors to the distortion are transformation plastic strain and plastic strain.
However, this technique has a detrimental effect on the non-uniform cooling that is believed to be a contributing factor to the non-uniform distortion.
Peak of HTC derived from S45C cylinder is higher than that from SUS304 cylinder, mainly due to the difference in the thermal property between them.
Different employed HTC will affect on the total strain causing different radial distortion.
By analyzing each strain data, the most contributing factors to the distortion are transformation plastic strain and plastic strain.
Online since: October 2012
Authors: Yu Long Chen, Xiao Fei Jing, Zhi Yong Cai, Wei Zhong Zhang
But with the increasing of dam quantities, the tailings dam collapsing in flood which are among the most dangerous hazards that affect mountainous and rural areas in a wide range of environments become more and more.
In aspect of theory calculation, the mathematical model of tailings dam break was put forward to forecast the hazard rate of debris flow from tailings dam break[2], and the main factors of tailings dam break were analyze[3].
In this model test, the model geometrical scale factor, lL, has been chosen as 1:300 (model: prototype).
(a) Point One (b) Point Three Fig.4 The displacement of key points in fine tailings dam dam Sliding Line Saturation Line Water level Fig.5 The slippage faces of fine tailings Numerical Analysis of Tailings Dam The materials were sampled and their properties were measured by laboratory testing and the results are summarized in Table 4.
Study of particle distribution characteristics and mechanical properties for tailings based on fractal theory.
In aspect of theory calculation, the mathematical model of tailings dam break was put forward to forecast the hazard rate of debris flow from tailings dam break[2], and the main factors of tailings dam break were analyze[3].
In this model test, the model geometrical scale factor, lL, has been chosen as 1:300 (model: prototype).
(a) Point One (b) Point Three Fig.4 The displacement of key points in fine tailings dam dam Sliding Line Saturation Line Water level Fig.5 The slippage faces of fine tailings Numerical Analysis of Tailings Dam The materials were sampled and their properties were measured by laboratory testing and the results are summarized in Table 4.
Study of particle distribution characteristics and mechanical properties for tailings based on fractal theory.
Online since: May 2025
Authors: Ojo Sunday Isaac Fayomi
Fayomi1,2a,*
1Department of Mechanical Engineering, Bells University of Technology, P.M.B. 1015, Ota, Ogun State, Nigeria
2Department of Mechanical Engineering Science, University of Johannesburg, Auckland Park, Kingsway Campus, Johannesburg, South Africa, P.
Most optimization models, including response surface methodology (RSM) provide insights on corrosion inhibition performance based on different factors such as degree of inhibitor concentration, temperature and time of exposure.
After drying, the peels were pulverized into fine powder using a mechanical grinder.
Design experiment with the corresponding corrosion resistance response Runs Factor 1 (A): Conc.
Jafar Mazumder, A review of green scale inhibitors: Process, types, mechanism and properties, Coatings 10 (2020) 928
Most optimization models, including response surface methodology (RSM) provide insights on corrosion inhibition performance based on different factors such as degree of inhibitor concentration, temperature and time of exposure.
After drying, the peels were pulverized into fine powder using a mechanical grinder.
Design experiment with the corresponding corrosion resistance response Runs Factor 1 (A): Conc.
Jafar Mazumder, A review of green scale inhibitors: Process, types, mechanism and properties, Coatings 10 (2020) 928
Online since: June 2014
Authors: Qi Qin, Shi Zhong Ma, Ming Wei Wang, Peng Yun Li
Introduction
Reservoir heterogeneity is refers to the basic properties of the reservoir (lithology, physical property, electric property and oiliness, etc.) on the 3D spatial distribution of heterogeneity[1-6].
Under the influence of structure, diagenesis and reservoir sedimentary environment, the interior of the reservoir physical properties and spatial distribution of non-uniform changes, which make the underground oil, gas, water sports and oil and gas recovery factor affected, so studying the reservoir heterogeneity has an important significance on oil and gas drilling and the evaluation of reservoir remaining oil.
According to mechanical analysis, the interior is divided into seven secondary rhythm (figure 1), with the thinnest 52 cm, upper and lower porosity is the rhythm of negative and positive , lower and upper permeability is the rhythm of negative and positive, secondary rhythm thin interbedded easily identified from the log.
Interlayer heterogeneity Refers to the reservoir sand body on longitudinal and physical properties of the differences between distribution characteristics, on the other hand refers to the distribution and the change of the mudstone interlayer between each group .In the layers of mudstone interlayer distribution change law is not obvious, here we focus on physical differences between the study of sand body.
Residual oil is generally a lot of focus on relatively strong heterogeneity and the horizon of relatively poor physical properties.Therefore, by the property differences between layer and interlayer heterogeneity parameters, The two layer FⅠ2, FⅠ7 is the main horizon of enrichment of remaining oil, as an important horizon for oilfields to explore.
Under the influence of structure, diagenesis and reservoir sedimentary environment, the interior of the reservoir physical properties and spatial distribution of non-uniform changes, which make the underground oil, gas, water sports and oil and gas recovery factor affected, so studying the reservoir heterogeneity has an important significance on oil and gas drilling and the evaluation of reservoir remaining oil.
According to mechanical analysis, the interior is divided into seven secondary rhythm (figure 1), with the thinnest 52 cm, upper and lower porosity is the rhythm of negative and positive , lower and upper permeability is the rhythm of negative and positive, secondary rhythm thin interbedded easily identified from the log.
Interlayer heterogeneity Refers to the reservoir sand body on longitudinal and physical properties of the differences between distribution characteristics, on the other hand refers to the distribution and the change of the mudstone interlayer between each group .In the layers of mudstone interlayer distribution change law is not obvious, here we focus on physical differences between the study of sand body.
Residual oil is generally a lot of focus on relatively strong heterogeneity and the horizon of relatively poor physical properties.Therefore, by the property differences between layer and interlayer heterogeneity parameters, The two layer FⅠ2, FⅠ7 is the main horizon of enrichment of remaining oil, as an important horizon for oilfields to explore.
Experimental Investigation and Analysis on Hard Turning of AISI D2 Steel Using Coated Carbide Insert
Online since: July 2014
Authors: A. Srithar, K. Palanikumar, B. Durgaprasad
Department of Mechanical Engineering, Sri Sai Ram Institute of Technology, Chennai, TN, India.
3.
It helps to increasing MRR with higher flexibility in terms of cutting geometry [5].The expected properties of tool materials are toughness, chemical stability and hot hardness [6].
In order to improve the surface properties and hardness these tools are coated with many ceramic materials such as TiC, TiN and Al2O3.
Study of chip pattern The chip morphology is an essential factor of study in metal machining.
The result shows that the feed rate is the highly important parameter, which affects the cutting forces in machining. 6.
It helps to increasing MRR with higher flexibility in terms of cutting geometry [5].The expected properties of tool materials are toughness, chemical stability and hot hardness [6].
In order to improve the surface properties and hardness these tools are coated with many ceramic materials such as TiC, TiN and Al2O3.
Study of chip pattern The chip morphology is an essential factor of study in metal machining.
The result shows that the feed rate is the highly important parameter, which affects the cutting forces in machining. 6.
Online since: September 2003
Authors: Andreas Schönecker, L.J. Geerligs, Armin Müller
The availability and cost efficiency but, even more important, the improved
wafer quality and the understanding how to process multi-crystalline silicon wafers into highly
efficient solar cells are important factors in this development.
This should result in homogeneous wafer properties.
Further efficiency influencing factors are the formation of oxygen related recombination centers (thermal and new donors) [8, 9, 10].
Damage of the coating (e.g., by sharp edges of the feedstock chunks) can therefore strongly affect the oxygen concentration.
Schönecker, "Over 10% efficient screen printed RGS solar cells", to be published in the proceedings 3 rd WCPEC, Osaka, 2003 [12] Giso Hahn, private communications [13] Properties of Crystalline Silicon, ed.
This should result in homogeneous wafer properties.
Further efficiency influencing factors are the formation of oxygen related recombination centers (thermal and new donors) [8, 9, 10].
Damage of the coating (e.g., by sharp edges of the feedstock chunks) can therefore strongly affect the oxygen concentration.
Schönecker, "Over 10% efficient screen printed RGS solar cells", to be published in the proceedings 3 rd WCPEC, Osaka, 2003 [12] Giso Hahn, private communications [13] Properties of Crystalline Silicon, ed.