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Online since: January 2012
Authors: Da Kang Zhong, Nan Sheng Qiu, Ya Sheng Wu, Xiao Ying Zhang
With the increasing number of wells and improved quality of seismic data, oil and gas resources have been found in fault basins in recent years[8-9].
The steep slope zone mainly develops nearshore subaqueous fan characterized by coarse grain and random distribution.
Grain size is upward-fining.
The steep slope zone mainly develops nearshore subaqueous fan characterized by coarse grain and random distribution.
Grain size is upward-fining.
Online since: March 2011
Authors: Chuan Sheng Wang, Ping Fu, Shan Hu Li
Powder and grain material conveying and weighing often uses the screw conveyor in rubber production, such as entity of helical blade, no hanging bearings, single head fixed horizontal screw conveyor of change pitch, shown in figure 1.
Tab. 1 Material parameter Lumpiness Grinding Example φ Type of spiral face K A Powder No Grinding Half-Grinding Graphite, Lime 0.30-0.40 Entity of helicoid 0.0415 75 Powder Grinding Cement, Gesso 0.25-0.3 Entity of helicoid 0.0565 35 Granular No Grinding Half-Grinding Grain, Saw Dust, Peat 0.25-0.35 Entity of helicoid 0.0490 50 Granular Grinding Sand, Slag 0.25-0.30 Entity of helicoid 0.0600 30 a<60mm No Grinding Half-Grinding Coal, Limestone 0.25-0.30 Entity of helicoid 0.0537 40 a<60mm Grinding Sandstone, Slag 0.20-0.25 Entity of helicoid Belth of elicoid 0.0645 25 a>60mm No Grinding Half-Grinding Lump coal, Massive lime 0.20-0.25 Entity of helicoid Belth of elicoid 0.0600 30 a>60mm Grinding Dry clay, Sulphur ore, Coke 0.125-0.20 Entity of helicoid Belth of elicoid 0.0795 15 Solidity Viscosity, Agglomerate Sugar , Starch 0.125-0.20 Belth of elicoid 0.0710 20 Tab. 2 Inclined conveying index Inclined angle/° 0 ≤5 ≤10 ≤15 ≤20 ≤30 ≤40 ≤50 ≤60 ≤70 ≤80 ≤90 Inclined conveying
In the conveying process, cell body and helical blade can produce serious wear easily, so in manufacturing of screw conveyer should pay attention to the following points: The molding of helical blades: First, process a certain number of single blade according to the requirements of the drawing, then cut one side of blade and weld them in group.
Tab. 1 Material parameter Lumpiness Grinding Example φ Type of spiral face K A Powder No Grinding Half-Grinding Graphite, Lime 0.30-0.40 Entity of helicoid 0.0415 75 Powder Grinding Cement, Gesso 0.25-0.3 Entity of helicoid 0.0565 35 Granular No Grinding Half-Grinding Grain, Saw Dust, Peat 0.25-0.35 Entity of helicoid 0.0490 50 Granular Grinding Sand, Slag 0.25-0.30 Entity of helicoid 0.0600 30 a<60mm No Grinding Half-Grinding Coal, Limestone 0.25-0.30 Entity of helicoid 0.0537 40 a<60mm Grinding Sandstone, Slag 0.20-0.25 Entity of helicoid Belth of elicoid 0.0645 25 a>60mm No Grinding Half-Grinding Lump coal, Massive lime 0.20-0.25 Entity of helicoid Belth of elicoid 0.0600 30 a>60mm Grinding Dry clay, Sulphur ore, Coke 0.125-0.20 Entity of helicoid Belth of elicoid 0.0795 15 Solidity Viscosity, Agglomerate Sugar , Starch 0.125-0.20 Belth of elicoid 0.0710 20 Tab. 2 Inclined conveying index Inclined angle/° 0 ≤5 ≤10 ≤15 ≤20 ≤30 ≤40 ≤50 ≤60 ≤70 ≤80 ≤90 Inclined conveying
In the conveying process, cell body and helical blade can produce serious wear easily, so in manufacturing of screw conveyer should pay attention to the following points: The molding of helical blades: First, process a certain number of single blade according to the requirements of the drawing, then cut one side of blade and weld them in group.
Online since: January 2010
Authors: A. Mohanta, D. Yadav, A. Kushwaha, Raj K. Thareja
At low laser fluence the formation
of C2 molecules is due to the collision of electrons with clusters of higher numbers of carbon atoms,
whereas at higher fluence, excitation resulting from electron-ion and ion-ion recombination is
responsible for C2 swan band emissions [12].
The film is crack free and grains are tightly packed.
The size of the irregular grains varies from 50 to 100 nm.
The film is crack free and grains are tightly packed.
The size of the irregular grains varies from 50 to 100 nm.
Online since: January 2005
Authors: Tamaz Eterashvili, M. Vardosanidze
Although, a number of papers [1-9] are dealing
with the methods of determination of size and shape of plastic zone, many questions regarding its
internal structure, shape and ways of evolution, still require attention.
The distances from these places to the microcrack tips were measured, and subsequently the polished surfaces were chemically etched in order to reveal austenite grains.
Moreover, taking into account all the above, the shape of plastic zone will alter depending on crystallography (slip and twinning) of the considered area of grain; mainly in polycrystalline materials.
The distances from these places to the microcrack tips were measured, and subsequently the polished surfaces were chemically etched in order to reveal austenite grains.
Moreover, taking into account all the above, the shape of plastic zone will alter depending on crystallography (slip and twinning) of the considered area of grain; mainly in polycrystalline materials.
Online since: October 2012
Authors: Wen Cui, Qin Luo
The major technical measures of construction were as follows:
(1)Axis, elevation, reinforced, templates, steel strand, position and number of the preformed hole must be checked
The same strength grade mortar which have a little stone were poured 0.02m thick in the meet Cha of the wall so as to ensure the meet Cha close-grained compacted.
Mechanical vibration was used of in the construction to ensure the concrete close-grained.
The same strength grade mortar which have a little stone were poured 0.02m thick in the meet Cha of the wall so as to ensure the meet Cha close-grained compacted.
Mechanical vibration was used of in the construction to ensure the concrete close-grained.
Online since: August 2013
Authors: Zhi Hong Qie, Xin Miao Wu, Juan Wang
I.Introduction
In recent years, with the development of highway construction in China, the number of highway and bridge have reached 284000, about 10.65 million meters long.
Table 2 Fault diagnosis result and remedy measures Fault phenomena Fault diagnosis result Remedy measure The cracks (>3mm) in tensile area of girder, mainly in middle part of girder Big bending stress value owing to Vehicle overloading (1) Increase section on every side of girder (2) Make reinforced concrete cover (3) Make steel hoop and then apply wire mesh cement on it Longitudinal cracks along the girder Rust of reinforcing steel bar Make grooves along the cracks, filling cement mortar epoxy grout in grooves Unevenness, honeycomb cavity and steel bar appearance on structure surface Construction quality problems (1) Screed with same grade cement mortar (2) Chisel off the protrudent aggregate grain, rinsing this part with pressure water, and then fill this part with grain size 10~20mm pea gravel concrete.
Table 2 Fault diagnosis result and remedy measures Fault phenomena Fault diagnosis result Remedy measure The cracks (>3mm) in tensile area of girder, mainly in middle part of girder Big bending stress value owing to Vehicle overloading (1) Increase section on every side of girder (2) Make reinforced concrete cover (3) Make steel hoop and then apply wire mesh cement on it Longitudinal cracks along the girder Rust of reinforcing steel bar Make grooves along the cracks, filling cement mortar epoxy grout in grooves Unevenness, honeycomb cavity and steel bar appearance on structure surface Construction quality problems (1) Screed with same grade cement mortar (2) Chisel off the protrudent aggregate grain, rinsing this part with pressure water, and then fill this part with grain size 10~20mm pea gravel concrete.
Online since: July 2015
Authors: Feng Tao, Zhi Jun Wang, Li Liu, Dong Cheng Ruan, Qi Liu, Yu Feng Sun, Zi Biao Lu
The analysis of a number of the products shows that these microsheets have an average diameter of 6.25 μm and a thickness of 90nm.
As we all know, when the infrared light acts on the sample, just only make the Er3+ and Yb3+ ions in the small thickness of the surface and low-energy state electronic can absorption infrared photon transition to the high-energy state, population to a higher level of metastable, but Er3+ and Yb3+ ions in the grain interior can not absorb infrared photons of outside radiation.
Therefore, the thicker and larger grains, the lest effectively stimulated the Er3+ and Yb3+ ions, lead to lower emission intensity inevitably [13].
As we all know, when the infrared light acts on the sample, just only make the Er3+ and Yb3+ ions in the small thickness of the surface and low-energy state electronic can absorption infrared photon transition to the high-energy state, population to a higher level of metastable, but Er3+ and Yb3+ ions in the grain interior can not absorb infrared photons of outside radiation.
Therefore, the thicker and larger grains, the lest effectively stimulated the Er3+ and Yb3+ ions, lead to lower emission intensity inevitably [13].
Online since: December 2016
Authors: Xin Cun Zhuang, Zhen Zhao, Kun Zhao, Xin Hua Pei
Saeidi et al [2] demonstrated via EBSD that most initial voids were nucleated between closely spaced martensite islands located between two large ferrite grains, where martensite islands were quite isolated.
Finally, by using software HYPERMESH, the model was generated with an edge length of 25μm and element size of 0.15μm, and the total element number was 29070.
Sharp sub-cracks in grain-scale with different sizes were ingrained on the bottom of the RVE model, simulating a microscale tensile test on a geometrically imperfect sample.
Finally, by using software HYPERMESH, the model was generated with an edge length of 25μm and element size of 0.15μm, and the total element number was 29070.
Sharp sub-cracks in grain-scale with different sizes were ingrained on the bottom of the RVE model, simulating a microscale tensile test on a geometrically imperfect sample.
Online since: February 2022
Authors: Lu Zhao, Bao Rui Du, Kai Lun Li, Jun Yao, Ruo Chen Ding
Specimen names with the features
Name
Laser power
Number of layers
Shape
Test position/ direction
S1
1800 W
1
cuboid
Section on YOZ plane
S2
2100 W
1
cuboid
Section on YOZ plane
S3
2400 W
1
cuboid
Section on YOZ plane
S4
2400 W
4
cuboid
Section on YOZ plane
S5
2400 W
4
I-shaped
X-axial, in layer 1
S6
2400 W
4
I-shaped
Y-axial, in layer 1
S7
2400 W
4
I-shaped
X-axial, in layer 2
S8
2400 W
4
I-shaped
Y-axial, in layer 2
Microstructural and mechanical characterization.
The most obvious change of this part is the coarsening of the grains and the formation of secondary Widmanstatten structure.
The grain size inclined to be lager which is have adverse effects on fracture strength.
The most obvious change of this part is the coarsening of the grains and the formation of secondary Widmanstatten structure.
The grain size inclined to be lager which is have adverse effects on fracture strength.
Online since: January 2013
Authors: Yang Huan Zhang, Dong Liang Zhao, Chen Zhao, Tai Yang, Hong Wei Shang, Haitao Wang
The enhanced hydriding kinetics is principally ascribed to the refined grains by melt spinning.
The huge number of interfaces and grain boundaries available in the nanocrystalline materials provide easy pathways for hydrogen diffusion and accelerate the hydrogen absorbing/desorbing process [4].
The huge number of interfaces and grain boundaries available in the nanocrystalline materials provide easy pathways for hydrogen diffusion and accelerate the hydrogen absorbing/desorbing process [4].