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Online since: March 2012
Authors: Peng Jun Cao, Hai Dong Wu, Ji Ling Dong
Stamatakis pointed out that to attenuate the 300~400nm ultraviolet ray the optimal grain size of the spherical TiO2 is 50~120nm, which is close to our calculation result.
Table 6 The thickness of topcoat Mass fraction (%) of nano-TiO2 Serial number 1 2 3 4 5 0 0.98 2.1 3 46µm 43 µm 48µm 45 µm 42 µm 45µm 42µm 46 µm 43 µm 45 µm 41µm 45 µm 43µm 46 µm 43 µm 42µm 44 µm 43 µm 45 µm 46 µm Adhesion force.
Table 8 The resisting impact strength of topcoat Mass fraction (%) of nano-TiO2 Serial number 1 2 3 4 5 0 0.98 2.1 3 0.50J 0.50J 0.50J 0.50J 0.50J 0.50J 0.50J 0.50J 0.50J 0.50J 0.50J 0.50J 0.50J 0.50J 0.50J 0.40J 0.40J 0.40J 0.40J 0.40J Hardness.
Table 9 The hardness of topcoat Mass fraction (%) of nano-TiO2 Serial number 1 2 3 4 5 0 0.98 2.1 3 0.52 0.54 0.51 0.55 0.52 0.56 0.58 0.55 0.60 0.58 0.59 0.60 0.62 0.63 0.61 0.62 0.64 0.63 0.65 0.64 Water fastness.
Table 10 The water fastness of topcoat Mass fraction (%) of nano-TiO2 Serial number 1 2 3 4 5 0 0.98 2.1 3 <120h <120h <120h <120h <120h >120h >120h >120h >120h >120h >120h >120h >120h >120h >120h >120h >120h >120h >120h >120h Aging resistance.
Table 6 The thickness of topcoat Mass fraction (%) of nano-TiO2 Serial number 1 2 3 4 5 0 0.98 2.1 3 46µm 43 µm 48µm 45 µm 42 µm 45µm 42µm 46 µm 43 µm 45 µm 41µm 45 µm 43µm 46 µm 43 µm 42µm 44 µm 43 µm 45 µm 46 µm Adhesion force.
Table 8 The resisting impact strength of topcoat Mass fraction (%) of nano-TiO2 Serial number 1 2 3 4 5 0 0.98 2.1 3 0.50J 0.50J 0.50J 0.50J 0.50J 0.50J 0.50J 0.50J 0.50J 0.50J 0.50J 0.50J 0.50J 0.50J 0.50J 0.40J 0.40J 0.40J 0.40J 0.40J Hardness.
Table 9 The hardness of topcoat Mass fraction (%) of nano-TiO2 Serial number 1 2 3 4 5 0 0.98 2.1 3 0.52 0.54 0.51 0.55 0.52 0.56 0.58 0.55 0.60 0.58 0.59 0.60 0.62 0.63 0.61 0.62 0.64 0.63 0.65 0.64 Water fastness.
Table 10 The water fastness of topcoat Mass fraction (%) of nano-TiO2 Serial number 1 2 3 4 5 0 0.98 2.1 3 <120h <120h <120h <120h <120h >120h >120h >120h >120h >120h >120h >120h >120h >120h >120h >120h >120h >120h >120h >120h Aging resistance.
Online since: September 2008
Authors: Kiyohide Wada, Yong Liu
It was proposed that the amount
of retained martensite increases with increased number of training and thereby promotes the TWME
[6].
We have conducted a large number of strain-temperature measurements which encompass the stress-assisted two-way memory effect (SATWME) and TWME.
Increase in the number of training cycles resulted in the progressive increase of Ms, while showing progressive decrease of As-temperature.
These dislocations tangles and the density increases with increased number of training cycles.
Deforming the specimen beyond the stress-plateau region causes further detwinning and reorientation of martensite, accompanied by a high density of dislocations forming at the grain boundaries (Fig. 12(a)).
We have conducted a large number of strain-temperature measurements which encompass the stress-assisted two-way memory effect (SATWME) and TWME.
Increase in the number of training cycles resulted in the progressive increase of Ms, while showing progressive decrease of As-temperature.
These dislocations tangles and the density increases with increased number of training cycles.
Deforming the specimen beyond the stress-plateau region causes further detwinning and reorientation of martensite, accompanied by a high density of dislocations forming at the grain boundaries (Fig. 12(a)).
Online since: March 2007
Authors: Mitsuo Niinomi, Hisao Fukui, Toshikazu Akahori, Michiharu Ogawa
An average diameter
of beta grain is around 20 μm.
Plain fatigue properties in air: Maximum cyclic stress-fatigue life (the number of cycles to failure) curves, i.e., S-N curves, obtained from plain fatigue tests on TNTZST and TNTZCR conducted with various thermomechanical treatments in air are shown in Fig. 2, along with ranges of fatigue limits of hot-rolled and cast Ti-6Al-4V ELI and Ti-6Al-7Nb [12].
in air. 300 400 500 600 700 800 900 300 400 500 600 700 800 900 Maximum Cyclic Stress,σmax/MPa Number of Cycles to Failure,Nf 105 106 107 104 Fati gue Limit Range of Ti-6Al-4V ELI Fati gue Limit Range of Ti-6Al-7Nb TNTZST TNTZST Aged at 598 K TNTZST Aged at 673 K TNTZST Aged at 723 K TNTZCR Aged at 598 K TNTZCR Aged at 673K TNTZCR TNTZCR Aged at 723 K Non Failure at 107 Cycles High Cycle Fatigue Life Region Low Cycle Fati gue Li fe Region with that of TNTZST and TNTZCR in both the low-(less than 10 5 cycles) and high-cycle (more than 105 cycles) fatigue life regions.
The notch fatigue strengths of aged TNTZST and TNTZCR at stress concentration 10 104 105 106 107 108 3 200 300 400 500 600 700 Maximum Cyclic Stress, σmax/MPa Number of Cycles to Failure, Nf TNTZST TNTZST Aged at 598 K TNTZST Aged at 673 K TNTZST Aged at 723 K TNTZCR Aged at 598 K TNTZCR Aged at 673K TNTZCR TNTZCR Aged at 723 K Fig. 3 S-N curves of TNTZ subjected to various thermo-mechanical treatments obtained from notchfatigue tests at (a) stress concentration factors of 2 and (b) 6 in air. 100 200 300 400 500 10 104 105 106 107 108 3 Maximum Cyclic Stress, σmax/MPa Number of Cycles to Failure, Nf (a) (b) 10 104 105 106 107 108 3 200 300 400 500 600 700 Maximum Cyclic Stress, σmax/MPa Number of Cycles to Failure, Nf TNTZST TNTZST Aged at 598 K TNTZST Aged at 673 K TNTZST Aged at 723 K TNTZST TNTZST Aged at 598 K TNTZST Aged at 673 K TNTZST Aged at 723 K TNTZCR Aged at 598 K TNTZCR Aged at 673K TNTZCR TNTZCR Aged at 723 K
TNTZCR Aged at 598 K TNTZCR Aged at 673K TNTZCR TNTZCR Aged at 723 K Fig. 3 S-N curves of TNTZ subjected to various thermo-mechanical treatments obtained from notchfatigue tests at (a) stress concentration factors of 2 and (b) 6 in air. 100 200 300 400 500 10 104 105 106 107 108 3 Maximum Cyclic Stress, σmax/MPa Number of Cycles to Failure, Nf (a) (b) factors of 2 and 6 decrease by 30% to 40% and 50% to 60%, respectively, as compared with the plain fatigue strengths in the low-fatigue life region (Fig. 2).
Plain fatigue properties in air: Maximum cyclic stress-fatigue life (the number of cycles to failure) curves, i.e., S-N curves, obtained from plain fatigue tests on TNTZST and TNTZCR conducted with various thermomechanical treatments in air are shown in Fig. 2, along with ranges of fatigue limits of hot-rolled and cast Ti-6Al-4V ELI and Ti-6Al-7Nb [12].
in air. 300 400 500 600 700 800 900 300 400 500 600 700 800 900 Maximum Cyclic Stress,σmax/MPa Number of Cycles to Failure,Nf 105 106 107 104 Fati gue Limit Range of Ti-6Al-4V ELI Fati gue Limit Range of Ti-6Al-7Nb TNTZST TNTZST Aged at 598 K TNTZST Aged at 673 K TNTZST Aged at 723 K TNTZCR Aged at 598 K TNTZCR Aged at 673K TNTZCR TNTZCR Aged at 723 K Non Failure at 107 Cycles High Cycle Fatigue Life Region Low Cycle Fati gue Li fe Region with that of TNTZST and TNTZCR in both the low-(less than 10 5 cycles) and high-cycle (more than 105 cycles) fatigue life regions.
The notch fatigue strengths of aged TNTZST and TNTZCR at stress concentration 10 104 105 106 107 108 3 200 300 400 500 600 700 Maximum Cyclic Stress, σmax/MPa Number of Cycles to Failure, Nf TNTZST TNTZST Aged at 598 K TNTZST Aged at 673 K TNTZST Aged at 723 K TNTZCR Aged at 598 K TNTZCR Aged at 673K TNTZCR TNTZCR Aged at 723 K Fig. 3 S-N curves of TNTZ subjected to various thermo-mechanical treatments obtained from notchfatigue tests at (a) stress concentration factors of 2 and (b) 6 in air. 100 200 300 400 500 10 104 105 106 107 108 3 Maximum Cyclic Stress, σmax/MPa Number of Cycles to Failure, Nf (a) (b) 10 104 105 106 107 108 3 200 300 400 500 600 700 Maximum Cyclic Stress, σmax/MPa Number of Cycles to Failure, Nf TNTZST TNTZST Aged at 598 K TNTZST Aged at 673 K TNTZST Aged at 723 K TNTZST TNTZST Aged at 598 K TNTZST Aged at 673 K TNTZST Aged at 723 K TNTZCR Aged at 598 K TNTZCR Aged at 673K TNTZCR TNTZCR Aged at 723 K
TNTZCR Aged at 598 K TNTZCR Aged at 673K TNTZCR TNTZCR Aged at 723 K Fig. 3 S-N curves of TNTZ subjected to various thermo-mechanical treatments obtained from notchfatigue tests at (a) stress concentration factors of 2 and (b) 6 in air. 100 200 300 400 500 10 104 105 106 107 108 3 Maximum Cyclic Stress, σmax/MPa Number of Cycles to Failure, Nf (a) (b) factors of 2 and 6 decrease by 30% to 40% and 50% to 60%, respectively, as compared with the plain fatigue strengths in the low-fatigue life region (Fig. 2).
Online since: August 2004
Authors: Ian G. Wright, R.C. John, A.L. Young, A.D. Pelton, W.T. Thompson
uncorroded
alloy
total
penetration
internal
penetration
external scale
internal
corrosion
products corroded grain
boundaries
Figure 1.
uncorroded alloy total penetration internal penetration external scale internal corrosion products corroded grain boundariesDetermination of the total metal penetration is a good assessment of an alloy's suitability for engineering application in a particular set of exposure conditions.
The progressive accumulation of this data over time is illustrated in Fig. 2 in terms of the total number of exposure hours represented by the data.
Most of the penetration occurred by internal oxidation along grain boundaries and internal to the grains.
uncorroded alloy total penetration internal penetration external scale internal corrosion products corroded grain boundariesDetermination of the total metal penetration is a good assessment of an alloy's suitability for engineering application in a particular set of exposure conditions.
The progressive accumulation of this data over time is illustrated in Fig. 2 in terms of the total number of exposure hours represented by the data.
Most of the penetration occurred by internal oxidation along grain boundaries and internal to the grains.
Online since: January 2011
Authors: Lei Shi, Qing Feng Sun, Jiang Deng
Get the disks and logs marked the south and north direction and numbered.
Table1 Basic information of Trees Numbers tree-age (Y) height of tree (m) clear length (m) DBH(diameter at breast height) (cm) Moisture content of green wood (%) elevation (m) Soil class male and female face S1 7 10.9 4.5 11.5 80.3 320 red earth sunny side S2 7 11.3 5.8 12.6 82.2 320 red earth sunny side S3 7 13.2 5.3 13.3 81.1 320 red earth sunny side S4 7 12.7 4.8 12.7 84.9 320 red earth sunny side S5 7 12.4 5.7 11.2 80.5 320 red earth sunny side Test method Anatomic property.Make wooden slice according to the regular method of closing dissection and observe the structure of the sample wood through optical microscope.
Data processing.Use the software SPSS12.0 to do statistical analysis on the eigenvalue of the anatomic construction number and physical and mechanical properties of timber.
The number of vessels is small and it is visible via naked eyes with more or less same size, evenly distributed, diffuse porous wood; there is a lot of axial parenchyma, which is visible by naked eyes and shaped as apotracheal band and terminal; the number of wood ray ranges from moderate to utmost and from extremely fine to less fine, obvious under magnifier.
The ray tissue always lays in single row or separated rows and the number of former is small, while the latter is large.
Table1 Basic information of Trees Numbers tree-age (Y) height of tree (m) clear length (m) DBH(diameter at breast height) (cm) Moisture content of green wood (%) elevation (m) Soil class male and female face S1 7 10.9 4.5 11.5 80.3 320 red earth sunny side S2 7 11.3 5.8 12.6 82.2 320 red earth sunny side S3 7 13.2 5.3 13.3 81.1 320 red earth sunny side S4 7 12.7 4.8 12.7 84.9 320 red earth sunny side S5 7 12.4 5.7 11.2 80.5 320 red earth sunny side Test method Anatomic property.Make wooden slice according to the regular method of closing dissection and observe the structure of the sample wood through optical microscope.
Data processing.Use the software SPSS12.0 to do statistical analysis on the eigenvalue of the anatomic construction number and physical and mechanical properties of timber.
The number of vessels is small and it is visible via naked eyes with more or less same size, evenly distributed, diffuse porous wood; there is a lot of axial parenchyma, which is visible by naked eyes and shaped as apotracheal band and terminal; the number of wood ray ranges from moderate to utmost and from extremely fine to less fine, obvious under magnifier.
The ray tissue always lays in single row or separated rows and the number of former is small, while the latter is large.
Online since: May 2014
Authors: Ahmad Jabbarzadeh, Roger I. Tanner, Abouzar Moshfegh
Introduction
About twenty years ago, the coarse-grained Dissipative Particles Dynamics (DPD) simulation method was proposed by Hoogerbrugge and Koelman [1] as a faster rival to Molecular Dynamics (MD).
Three pairwise-additive major DPD forces known as conservative (FijC), dissipative (FijD) and random (FijR) forces are applied via: FijC=Aij1-rijRcrijrij , FijD=-γ ωDrij rij⋅vij rijrij2 , FijR=σ ωRrij ξijdt rijrij (2) ξijt=0 and ξijt ξklt'=(δikδjl+δilδjk) δt-t' , ξij≈12 (θij-0.5) (3) Where Aij is repulsion parameter, Rc is the cutoff radius (or particle effective diameter), ωDrij and ωRrij are the weight functions, γ is the damping factor or drag coefficient, vij is the relative absolute velocity between two particles, σ is the noise amplitude for randomly generated numbers (ξij) with Gaussian white-noise statistics, zero mean and unit variance.
In this paper we adopt Mersenne Twister pseudorandom numbers generator [7] to yield double precision equidistributed uniform numbers (θij) between 0 and 1.
(DPD settings: σ=3, ρ=3, Box=(10 Rc)3, Aii=25, dt=0.01, Nt=50,000, kBT=1.0) Here, Vshear is the velocity whereby the shear planes are driven via Lees-Edwards boundary condition [8], ρ is the number density of particles, Nt is the number of total time steps, and kBT stands as system target equilibrium temperature.
Nishimura, Mersenne twister: a 623-dimensionally equidistributed uniform pseudo-random number generator.
Three pairwise-additive major DPD forces known as conservative (FijC), dissipative (FijD) and random (FijR) forces are applied via: FijC=Aij1-rijRcrijrij , FijD=-γ ωDrij rij⋅vij rijrij2 , FijR=σ ωRrij ξijdt rijrij (2) ξijt=0 and ξijt ξklt'=(δikδjl+δilδjk) δt-t' , ξij≈12 (θij-0.5) (3) Where Aij is repulsion parameter, Rc is the cutoff radius (or particle effective diameter), ωDrij and ωRrij are the weight functions, γ is the damping factor or drag coefficient, vij is the relative absolute velocity between two particles, σ is the noise amplitude for randomly generated numbers (ξij) with Gaussian white-noise statistics, zero mean and unit variance.
In this paper we adopt Mersenne Twister pseudorandom numbers generator [7] to yield double precision equidistributed uniform numbers (θij) between 0 and 1.
(DPD settings: σ=3, ρ=3, Box=(10 Rc)3, Aii=25, dt=0.01, Nt=50,000, kBT=1.0) Here, Vshear is the velocity whereby the shear planes are driven via Lees-Edwards boundary condition [8], ρ is the number density of particles, Nt is the number of total time steps, and kBT stands as system target equilibrium temperature.
Nishimura, Mersenne twister: a 623-dimensionally equidistributed uniform pseudo-random number generator.
Online since: July 2021
Authors: Victor V. Nosov, Egor V. Grigoriev, Sabina A. Peretyatko, Artem P. Artyushchenko
The structure of the material has a hierarchical property, and an example of structural elements can be grains or their boundaries and non-metallic inclusions in metals and their alloys as shown in Fig. 1.
Fractogram of micro-damage of weld metal at different moments of time The model of a stream of signals of AE in the form of dependence on time of t of number of Nå of impulses of AE of materials has the following general view: Nåt=V∆t, f, uФ∆t, f, ududfd∆t×C0ω0ω0+∆ωψω1--exp-0tdt'θU0,ωt'dω, (1) where each of the parameters included in (1) is presented in Table 1, has a certain physical nature and depends on various factors affecting the control suitability of destruction and strength properties of the material.
parameters included in formula (1) Formula parameter Physical meaning Scale level Θ (U0, ω(t՛) = = τ0 exp {[U0 − γσ(t՛)]/(KT)} Failure time of heterogeneity element (molecular bond or structural trace element)[30] Nano-microlevel τ0 Period of atomic oscillations Nanolevel U0 Activation energy of molecular bond breaking process Nanolevel g Activation volume Nanolevel σ Stresses on heterogeneity element Nanolevel K Boltzmann's constant Nanolevel T Absolute temperature of heterogeneity element Nanolevel ω = γσ/KT Nano-characteristic of strength of heterogeneity element Nanolevel Ф (Δt, f, u) The function of control destabilization, presented in the form of density of distribution of AE signals by duration of pauses Δt, frequency f and amplitude u, characterizes the connection of AE signals with their sources Microlevel C0 Concentration of heterogeneity elements Microlevel V Total volume of monitored object Macrolevel Acoustically active (AE controlled) volume of material Macrolevel kАЭ⋅C0 Number
At constant temperature T and period τcycle of cyclic loading, number NC of cycles till destruction is: NC=θ/τcycle=τ0/τcycleexp[(U0-γσ)/KT], at σ=0 value NC=NB, where: lgNB=lg(τ0/τcycle)+0,43U0/(KT)≈const. (4) Mapping of both mathematical expressions: YАЕ=dlnNΣuniform/dσ=γ/KT and YR=-dlnNC/dσ=γ/KT, (5) and the numerical values of the parameters YAE and YR detect their identity (YAE=YR=0,015 MPa-1) and allow us to assert the inversely proportional relationship between the number of cycles before destruction NC and the number of AE pulses NΣuniform, which are recorded at the stage of uniform destruction: NC≅A/NΣuniform. (6) This confirms the assumption that the linear damage summation hypothesis [34, 35] is consistent with the homogeneous failure stage, which allows the prediction of the residual resource.
The transition from visual control of the number of cycles to destruction of standard samples with conditionally identical defects to automated acoustic-emission control of the destruction time of representative microelements of the material of an industrial facility, which made it possible to ensure the control suitability of the damage accumulation process; 2.
Fractogram of micro-damage of weld metal at different moments of time The model of a stream of signals of AE in the form of dependence on time of t of number of Nå of impulses of AE of materials has the following general view: Nåt=V∆t, f, uФ∆t, f, ududfd∆t×C0ω0ω0+∆ωψω1--exp-0tdt'θU0,ωt'dω, (1) where each of the parameters included in (1) is presented in Table 1, has a certain physical nature and depends on various factors affecting the control suitability of destruction and strength properties of the material.
parameters included in formula (1) Formula parameter Physical meaning Scale level Θ (U0, ω(t՛) = = τ0 exp {[U0 − γσ(t՛)]/(KT)} Failure time of heterogeneity element (molecular bond or structural trace element)[30] Nano-microlevel τ0 Period of atomic oscillations Nanolevel U0 Activation energy of molecular bond breaking process Nanolevel g Activation volume Nanolevel σ Stresses on heterogeneity element Nanolevel K Boltzmann's constant Nanolevel T Absolute temperature of heterogeneity element Nanolevel ω = γσ/KT Nano-characteristic of strength of heterogeneity element Nanolevel Ф (Δt, f, u) The function of control destabilization, presented in the form of density of distribution of AE signals by duration of pauses Δt, frequency f and amplitude u, characterizes the connection of AE signals with their sources Microlevel C0 Concentration of heterogeneity elements Microlevel V Total volume of monitored object Macrolevel Acoustically active (AE controlled) volume of material Macrolevel kАЭ⋅C0 Number
At constant temperature T and period τcycle of cyclic loading, number NC of cycles till destruction is: NC=θ/τcycle=τ0/τcycleexp[(U0-γσ)/KT], at σ=0 value NC=NB, where: lgNB=lg(τ0/τcycle)+0,43U0/(KT)≈const. (4) Mapping of both mathematical expressions: YАЕ=dlnNΣuniform/dσ=γ/KT and YR=-dlnNC/dσ=γ/KT, (5) and the numerical values of the parameters YAE and YR detect their identity (YAE=YR=0,015 MPa-1) and allow us to assert the inversely proportional relationship between the number of cycles before destruction NC and the number of AE pulses NΣuniform, which are recorded at the stage of uniform destruction: NC≅A/NΣuniform. (6) This confirms the assumption that the linear damage summation hypothesis [34, 35] is consistent with the homogeneous failure stage, which allows the prediction of the residual resource.
The transition from visual control of the number of cycles to destruction of standard samples with conditionally identical defects to automated acoustic-emission control of the destruction time of representative microelements of the material of an industrial facility, which made it possible to ensure the control suitability of the damage accumulation process; 2.
Online since: October 2012
Authors: You Peng Xu, Ming Jing Yu, Liu Yan Wang
Complexity of river network (CR): It is used to describe the development degree of river network’s number and length.
In network graph, degree of vertices (Di) of a certain vertex is the number of edges connecting it[3].
The higher the degree of vertices is, the fewer the number of vertices is.
From 1960s to 1980s and then in 2009, the number of edges, vertices and vertices of different Di are gradually reducing and the reduction is more obvious in the later period.
For instance, after 1950s, large acreage of lakes reclaim, and reclamation of land from lake for grain.
In network graph, degree of vertices (Di) of a certain vertex is the number of edges connecting it[3].
The higher the degree of vertices is, the fewer the number of vertices is.
From 1960s to 1980s and then in 2009, the number of edges, vertices and vertices of different Di are gradually reducing and the reduction is more obvious in the later period.
For instance, after 1950s, large acreage of lakes reclaim, and reclamation of land from lake for grain.
Online since: December 2012
Authors: Xiao Gang Liu, Xin Le Wang, Qi Liang Yang
Soil moisture status is one of the main factors affecting the coffee root activity and leaf function, so strengthening water management is the main measure to guarantee growth of root, leaf, grain, quality and high yield.
The flower numbers and yield were basically the same under different irrigation treatments (100 mm, 80 mm, and 60 mm) [9].
The results showed that the number of flower and fruit increased with increasing irrigation amount, and irrigation amount of 20 L to 25 L made flowering period shifted to an earlier date than 15 L [14].
Based on the effect of fertilization and shade on the 6-year-old coffee growth and yield, nodes number and yield of coffee increased with increasing shade, while effect of fertilization was no significant on coffee leaf and node number, the leaf area of each branch and yield [18].
The study investigated the effect of different irrigation and fractional step fertilizer on coffee plant height, diameter of main stem, corolla and the number of nodes with four irrigation levels in Minas Gerais, Brazil, and the results showed that fractional step fertilizer did not increase coffee yield, while irrigation of 120%ET0 could achieve high yield[24].
The flower numbers and yield were basically the same under different irrigation treatments (100 mm, 80 mm, and 60 mm) [9].
The results showed that the number of flower and fruit increased with increasing irrigation amount, and irrigation amount of 20 L to 25 L made flowering period shifted to an earlier date than 15 L [14].
Based on the effect of fertilization and shade on the 6-year-old coffee growth and yield, nodes number and yield of coffee increased with increasing shade, while effect of fertilization was no significant on coffee leaf and node number, the leaf area of each branch and yield [18].
The study investigated the effect of different irrigation and fractional step fertilizer on coffee plant height, diameter of main stem, corolla and the number of nodes with four irrigation levels in Minas Gerais, Brazil, and the results showed that fractional step fertilizer did not increase coffee yield, while irrigation of 120%ET0 could achieve high yield[24].
Online since: November 2012
Authors: Zhi Dong Guo, Jia Liu, Cang Bo Li
Table 2 Renewable materials gradation table of different sections
Section number
Section number (mm)
31.5
26.5
19
9.5
4.75
2.36
0.6
0.075
section1
Through the quality percentage (%)
100
93
80
53
34
24
13
2
Cumulative retained percentage (%)
0
7
10
47
66
76
87
98
section2
Through the quality percentage (%)
100
96
91
75
58
36
24
99
Cumulative retained percentage (%)
4
9
25
42
64
76
1
From Table 2, milling regeneration material from representative sections 1 meets grading conditions required by the design and specification requirements, so there is no need to add a new aggregate.
Representative sections of 2 milling regenerative materials do not conform to the specification requirements and design gradation, thus still need to add the corresponding proportion of aggregate, so that more than 4.75mm’s aggregates of the sections’s mixture account for more than 65%, and ensure that the regeneration layer form skeleton close-grained structure, to meet the requirements of bearing capacity [4].
If the road width is less than 6 meters, it should choose the full width construction instead of half construction, in order to reduce the number of seams, improve construction efficiency; Overlapping width of longitudinal regeneration layer is not less than 15 centimeter, at the same time we must due to increase the dosage of cement in the joints.
Total number of feet No. of unqualified ruler Roughness average (mm) Qualified rate (%) K0+030-0+090 20 0 7 100 K1+150-1+210 20 2 6 90 K2+320-2+380 20 0 8 100 K3+230-3+290 20 1 6 95 Table 8 Sampling results of cold-recycled base bending and sinking Pile No.
The use of cold recycling process fully use of renewable resources of waste asphalt to avoid the generation of a large number of highway construction waste, to save considerable land resources, to effectively prevent soil erosion[8]. 1 kilometer and 4 meter width road can save earthwork 4.6m× 1000m×0.3m =1380m3, and avoid construction waste 1380 m3, so that more than 100 kilometers of transformed old asphalt pavement in Jixian County can be saved 414 acres of land annually (digging farming is computed as 50cm per acre) , Each year to avoid slag 138000 cubic meters, saving the special environmental governance cost of hundreds of thousands of dollars.
Representative sections of 2 milling regenerative materials do not conform to the specification requirements and design gradation, thus still need to add the corresponding proportion of aggregate, so that more than 4.75mm’s aggregates of the sections’s mixture account for more than 65%, and ensure that the regeneration layer form skeleton close-grained structure, to meet the requirements of bearing capacity [4].
If the road width is less than 6 meters, it should choose the full width construction instead of half construction, in order to reduce the number of seams, improve construction efficiency; Overlapping width of longitudinal regeneration layer is not less than 15 centimeter, at the same time we must due to increase the dosage of cement in the joints.
Total number of feet No. of unqualified ruler Roughness average (mm) Qualified rate (%) K0+030-0+090 20 0 7 100 K1+150-1+210 20 2 6 90 K2+320-2+380 20 0 8 100 K3+230-3+290 20 1 6 95 Table 8 Sampling results of cold-recycled base bending and sinking Pile No.
The use of cold recycling process fully use of renewable resources of waste asphalt to avoid the generation of a large number of highway construction waste, to save considerable land resources, to effectively prevent soil erosion[8]. 1 kilometer and 4 meter width road can save earthwork 4.6m× 1000m×0.3m =1380m3, and avoid construction waste 1380 m3, so that more than 100 kilometers of transformed old asphalt pavement in Jixian County can be saved 414 acres of land annually (digging farming is computed as 50cm per acre) , Each year to avoid slag 138000 cubic meters, saving the special environmental governance cost of hundreds of thousands of dollars.