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Online since: March 2015
Authors: De Fu Li, Sheng Li Guo, Xiang Ai Liu, Ce Feng, Sheng Pu Liu
During unloading, the stress was unable to hold together the large number of mutually repelling mobile dislocations, which made the dislocations move in opposite directions [12].
Moreover, with the increment of pre-strain, dislocations move along slip planes and easily pile up by the impediment of grain boundaries and twin boundaries.
Moreover, with the increment of pre-strain, dislocations move along slip planes and easily pile up by the impediment of grain boundaries and twin boundaries.
Online since: January 2012
Authors: Toshiyuki Takagi, Takanori Takeno, Hiroyuki Miki, Yun Luo
One can see that small tungsten
particles whose average grain size is around 5 nm are well dispersed in carbon host matrix.
The layer numbered as 3 plays a role as a sensor, and layer 2 in between them is for electrically insulating layer.
The layer numbered as 3 plays a role as a sensor, and layer 2 in between them is for electrically insulating layer.
Online since: July 2011
Authors: Qiu Sheng Yan, Jing Fu Chai, Jia Bin Lu, Min Li
When speed increases, the number of grains involved in processing increases per unit time, thus improving the material removal rate, but when the speed reaches a certain value, the centrifugal force also increases, it results in accelerating the escape of particles, so that the movement distance of a single particle diminishes, the retention time is shorter, so the roughness of the workpiece increases, the material removal rate decreases.
Online since: December 2011
Authors: Michael N. Morgan, Pitipong Benjarungroj, Steve Vaughan, X.J. Ren, P. Harrison
There are a number of different mass finishing processes.
The cullet is then sieved and subsequently graded in a manner similar to that for abrasive grinding grains.
The cullet is then sieved and subsequently graded in a manner similar to that for abrasive grinding grains.
Online since: October 2011
Authors: Shu Lin Dai, Yan Cheng
The high temperature and pressure shock instantaneous produced by blasting is so strong that it makes the rock of crushed zone extreme crushing,it is bad for expanding the blasting volume and improving the blasting efficiency,sometimes even narrow the scope of crushed zone in order to reduce energy consumption.The elastic vibration area is far from the hole so that the stress which decays to less than the strengh of the rock can not crush the rock.The rock in the rupture zone will burst because of a large number of cracks that are produced by blasting,therefore,the rupture zone is the main body of rock blasting.It can improve the quality of blasting by making the cracks of the rupture zone full expansion and extension.
Calculated as stress wave of explosion,the radius of the rupture zone is calculated by the following: (1) In which,: the tensile strength of rock,Mpa;b:scale factor of tangential stress and radial stress, ,:Poisson’s ratio;:stress wave attenuation index about topography and geological conditions of the distance between blasting point and protection,according<< Transportation and Civil Engineering Blasting Engineer Manual >>, values as following: Table 1 The relationship between lithologic and K、 K α Hard rock 50~150 1.3~1.5 medium hardness rock 150~250 1.5~1.8 Soft rock 250~350 1.8~2.0 Table 2 2﹟rock ammonia dynamite performance ps s C [kg/m3] f m 0.83 0.83 0.48 0.57 0.9 1.25 P2:the initial radial stress peak of stress wave,MPa,,:explosive density,kg/m3; D1:detonation velocity, m/s;rb:hole radius,mm;rc:grain radius,mm;n:multiple pressure, n=8~11.
Calculated as stress wave of explosion,the radius of the rupture zone is calculated by the following: (1) In which,: the tensile strength of rock,Mpa;b:scale factor of tangential stress and radial stress, ,:Poisson’s ratio;:stress wave attenuation index about topography and geological conditions of the distance between blasting point and protection,according<< Transportation and Civil Engineering Blasting Engineer Manual >>, values as following: Table 1 The relationship between lithologic and K、 K α Hard rock 50~150 1.3~1.5 medium hardness rock 150~250 1.5~1.8 Soft rock 250~350 1.8~2.0 Table 2 2﹟rock ammonia dynamite performance ps s C [kg/m3] f m 0.83 0.83 0.48 0.57 0.9 1.25 P2:the initial radial stress peak of stress wave,MPa,,:explosive density,kg/m3; D1:detonation velocity, m/s;rb:hole radius,mm;rc:grain radius,mm;n:multiple pressure, n=8~11.
Online since: April 2014
Authors: Jin Tian Huang, Yan Fei Pan, Ya Bin Li
Morphology Analysis of SEM From Fig. 3, we can see that microcrystalline cellulose after carboxylic acid, the microcrystalline cellulose grain decreases significantly and the damage of surface and internal structure appeares, what’s more, morphological structure begins to crush and surface area is also changed, but the fiber rod structure is still kept.
Another important factor is due to the particularity of cellulose micro environment (a large number of hydroxyl, carboxylic acid), and the catalytic oxidation of methyl orange is accelerated; Finally, there also exists the fiber surface adsorption.
Another important factor is due to the particularity of cellulose micro environment (a large number of hydroxyl, carboxylic acid), and the catalytic oxidation of methyl orange is accelerated; Finally, there also exists the fiber surface adsorption.
Online since: September 2015
Authors: Chun Hu Tao, Yu Li Gu
The frequency can reach several kHz and the cycle numbers can exceed 109[1-3].
The grain orientation difference distribution was studied by means of electron back-scattered diffraction(EBSD) technique.
The grain orientation difference distribution was studied by means of electron back-scattered diffraction(EBSD) technique.
Online since: January 2019
Authors: Boonsom Porntepkasemsan, Phatchada Nochit, Wutthikrai Kulsawat
Intact residue is the stalk of the rice plant that is left standing in the field after the combine has cut the top most portion of the plant that carries the grain.
Significant reduction in larval numbers can be achieved by removing crop residues through burning.
Significant reduction in larval numbers can be achieved by removing crop residues through burning.
Online since: February 2014
Authors: Shamsuddin Sulaiman, Sulaiman Suraya, Abdul Aziz Fazilah, Ali Munira
The particles are no longer isolated with the ductile aluminum alloy matrix since the number of contacts between TiC particle increases.
[11] Pio, L.Y., Sulaiman, S., Hamouda, A.M. and Ahmad, M.M.H.M, Grain refinement of LM6 Al-Si alloy sand castings to enhance mechanical properties.
[11] Pio, L.Y., Sulaiman, S., Hamouda, A.M. and Ahmad, M.M.H.M, Grain refinement of LM6 Al-Si alloy sand castings to enhance mechanical properties.
Online since: October 2010
Authors: Federica Bezzi, Claudio Mingazzini, Alida Brentari, Paride Fabbri, Emiliano Burresi, Leandro Beaulardi, Sergio Sangiorgi
The increasing of the particles content implies a higher slurry viscosity: the number of particle-particle interactions increases then the resistance to flow rises.
Two main fractions are observed: a fine fraction of elongated particles of about 1-10 mm and a coarse fraction of irregular grain with size up to 100 mm.
Two main fractions are observed: a fine fraction of elongated particles of about 1-10 mm and a coarse fraction of irregular grain with size up to 100 mm.