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Online since: October 2011
Authors: Tao Xu, Hui Zhang, Ge Yan Fu, Ai Qin Xu, Chen Wang
Hardness value of T10 steel specimen becomes smaller with the increase of impact times, but after 8000 times, it significantly increases along with the increase of the number of impact .At point5, that is after 16000 times, hardness value tends to rising steadily.
XRD map analysis of Specimens Fig 5 Original XRD mapping of T10 steel specimen Fig 6 Static load XRD mapping of T10 steel specimen Fig 7 Impact load XRD mapping of T10 steel specimen Compared Fig 5, Fig 6 and Fig 7,we know that the specimen, before and after the experiment ,are different in peak position and number of peak .Crystalline phase index is also different, and its ratio follows: 1:2:3:4:5:6:8:9:10:, 1:2:3:4:5:6:8without 7,both complying with simple cubic crystalline structure types.
Table 1 Parameter values when the diffraction intensity I = 100% Parameter character of load, 2θ[Prague diffraction Angle] Average grain size[nm] Micro strain[nm] Faces spacing[nm] Crystal area[nm2] original 44.57 29 -0.1076 0.20363 1462 Static 44.561 29.4 -0.1253 0.20316 1345.8 Impact 44.603 29.6 -0.1273 0.20349 1335.5 Interplanar spacing and crystal area are smaller, yet crystal size and microscopic strain are getting bigger after static load or impact load.
XRD map analysis of Specimens Fig 5 Original XRD mapping of T10 steel specimen Fig 6 Static load XRD mapping of T10 steel specimen Fig 7 Impact load XRD mapping of T10 steel specimen Compared Fig 5, Fig 6 and Fig 7,we know that the specimen, before and after the experiment ,are different in peak position and number of peak .Crystalline phase index is also different, and its ratio follows: 1:2:3:4:5:6:8:9:10:, 1:2:3:4:5:6:8without 7,both complying with simple cubic crystalline structure types.
Table 1 Parameter values when the diffraction intensity I = 100% Parameter character of load, 2θ[Prague diffraction Angle] Average grain size[nm] Micro strain[nm] Faces spacing[nm] Crystal area[nm2] original 44.57 29 -0.1076 0.20363 1462 Static 44.561 29.4 -0.1253 0.20316 1345.8 Impact 44.603 29.6 -0.1273 0.20349 1335.5 Interplanar spacing and crystal area are smaller, yet crystal size and microscopic strain are getting bigger after static load or impact load.
Online since: March 2004
Authors: S.H. Chen, Hua Li Zhang, Bin Lin, W.J. Guo, Q.H. Yuan, J.G. Zhang
Heat source model
Fig.1 Illustration of the grinding zone heat source Journal Title and Volume Number (to be inserted by the publisher) 255
When t
� � , the process of heat conduction reaches its quasi-steady state in the moving coordinate.
The reason is that with an increase of the feed speed, the cutting thickness of each abrasive grain augments correspondingly, so the grinding force and energy rise notably.
It can be obtained from the Fig.6b that the adoption of an appropriate and higher feed speed of worktable makes the temperature field of Journal Title and Volume Number (to be inserted by the publisher) 257 workpiece more homogeneous and improves the surface quality of workpiece.
The reason is that with an increase of the feed speed, the cutting thickness of each abrasive grain augments correspondingly, so the grinding force and energy rise notably.
It can be obtained from the Fig.6b that the adoption of an appropriate and higher feed speed of worktable makes the temperature field of Journal Title and Volume Number (to be inserted by the publisher) 257 workpiece more homogeneous and improves the surface quality of workpiece.
Online since: August 2014
Authors: Monna Rozana, Zainovia Lockman, Mustaffa Ali Azhar, Ehsan Ahmadi, Dede Miftahul Anwar, Abdul Razak Khairunisak, Kuan Yew Cheong, Mabel de Cunha
This is parallel to the findings of Grimes et al whereby heat treatment of TNTs at high temperature results in the oxidation of the underlying Ti foils accompanied by grains growth, destroying the nanotubes structure completely [6].
Anatase peaks are 25.2o, 37.8o 48o and 53.8o with ICDD number of 00-021-1272.
It will reduce the number of charge carriers reaching the electrode.
Anatase peaks are 25.2o, 37.8o 48o and 53.8o with ICDD number of 00-021-1272.
It will reduce the number of charge carriers reaching the electrode.
Online since: September 2013
Authors: Tian Hui Ma, Ai Shan Li, Liao Yuan Zhang, Jian Qiu Sun, Bo Huang
These damaged cells are dispersed,initially.With the number of broken cells increased,the ruptured cells gathered gradually,micro-fracture led to micro-cracks`s generation.And micro- cracks,with the hydraulic pressure`s increase,extends along the horizontal direction substantially to form a horizontal macro-cracks. rock samples are not instability and failure, although the macroscopic crack has been generated.That is the wall of pore began to crack under hydraulic pressure ,does not mean samples are damaged all along or unstable propagation of crack.
We can read from the figures, the general direction of macroscopic crack`s extension does not change much, but remain level.High water pressure and high stress areas moves along crack tip, hydraulic pressure distribution becomes oval,because of the increased number of adjacent destroyed cells.Increased stress area transfer to the crack tip to promote crack propagation.Due to the non-uniformity of the rock material, it could be found in figures that the size, length, extending direction of two crack is not identical.
Observations of intergranular stress corrosion cracking in a grain-mapped polycrystal[J].
We can read from the figures, the general direction of macroscopic crack`s extension does not change much, but remain level.High water pressure and high stress areas moves along crack tip, hydraulic pressure distribution becomes oval,because of the increased number of adjacent destroyed cells.Increased stress area transfer to the crack tip to promote crack propagation.Due to the non-uniformity of the rock material, it could be found in figures that the size, length, extending direction of two crack is not identical.
Observations of intergranular stress corrosion cracking in a grain-mapped polycrystal[J].
Online since: February 2014
Authors: Aam Hamdani, Heru Yuwono, Dadi Rusdiana, Lilik Hasanah, Budi Mulyanti, Ida Hamidah
The potential approximation will approach the true potential when the number of segments increased.
All materials in solid form was previously crushed for 3 hours in order to obtain refined grains, and then shaken manually for 1 hour to produce precursors.
It is because when an increase in bias voltage, the number of electrons that goes through n-p heterojunction will increase as well.
All materials in solid form was previously crushed for 3 hours in order to obtain refined grains, and then shaken manually for 1 hour to produce precursors.
It is because when an increase in bias voltage, the number of electrons that goes through n-p heterojunction will increase as well.
Online since: January 2015
Authors: Shu Bin Gu, Cheng Chen, Hong Chen
A large number of experiments show that polynomial (1) is in a chaotic state in the following situation:
α=10, β=14.87, m0=-0.27, m1=0.32, x(0)=0.2, y(0)=0.2, z(0)=0.2 (2)
All this paper’s experiments are in this situation.
It shows a large number of information related to speeches’ characteristics.
Spectrums of signal encrypted by chaos before and after UPT Different shades of grains in the speech spectrogram are called “voiceprint”.
It shows a large number of information related to speeches’ characteristics.
Spectrums of signal encrypted by chaos before and after UPT Different shades of grains in the speech spectrogram are called “voiceprint”.
Online since: February 2006
Authors: An Xian Lu, Z.B. Ke, G.F. Huang
In principle, a number of glass-ceramic systems could be used to give the characteristics
required for sealing to metals and alloys.
Materials from the Li2O-ZnO-Al2O3-SiO2 system do, however offer a number of distinct advantages over other candidates.
The spherical grains with a size of 0.2-0.5um and close similar microstructure can be observed from Fig. 3(c) and (d), which shows the microstructure of the glass-ceramics obtained by treating K0 and K3 at 820°C for 2h respectively.
Materials from the Li2O-ZnO-Al2O3-SiO2 system do, however offer a number of distinct advantages over other candidates.
The spherical grains with a size of 0.2-0.5um and close similar microstructure can be observed from Fig. 3(c) and (d), which shows the microstructure of the glass-ceramics obtained by treating K0 and K3 at 820°C for 2h respectively.
Online since: August 2014
Authors: Jozef Melcer
The properties of the road profile are described by Power Spectral Density function (PSD) in the form
, (7)
where Ω in [rad/m] denotes the wave number, Ω0 = 1 rad/m is the reference wave number and the waviness k = 2.
h = 140 mm E = 4800 MPa I = 2.2866×10-4 m4 k @ 156.04549 MPa MGMA; 40 mm; E = 5500 MPa; υ = 0.33 AC; 50 mm; E = 6000 MPa; υ = 0.30 CG; 50 mm; E = 3050 MPa; υ = 0.33 SC; 150 mm; E = 2000 MPa; υ = 0.22 GS; 150 mm; E = 400 MPa; υ = 0.30 S; ¥; E = 60 MPa; υ = 0.35 º Fig. 2 Pavement computing model, MGMA – medium grained mastic asphalt, AC – asphalt concrete, CG – coated gravel, SC – soil cement, GS – gravel sand, S – subgrade The layers, No. 4 – 6, are taken into calculation as Winkler elastic foundation.
h = 140 mm E = 4800 MPa I = 2.2866×10-4 m4 k @ 156.04549 MPa MGMA; 40 mm; E = 5500 MPa; υ = 0.33 AC; 50 mm; E = 6000 MPa; υ = 0.30 CG; 50 mm; E = 3050 MPa; υ = 0.33 SC; 150 mm; E = 2000 MPa; υ = 0.22 GS; 150 mm; E = 400 MPa; υ = 0.30 S; ¥; E = 60 MPa; υ = 0.35 º Fig. 2 Pavement computing model, MGMA – medium grained mastic asphalt, AC – asphalt concrete, CG – coated gravel, SC – soil cement, GS – gravel sand, S – subgrade The layers, No. 4 – 6, are taken into calculation as Winkler elastic foundation.
Online since: August 2014
Authors: Lei Chen, Pan Zhang
Only consider the ideal circumstances of the leakage between block bodies and floating block slot, the theoretical average flow of pump formula is possible to write:
(1)
where ——vane lift
——floating block depth
——rotational speed
——number of vanes
1——floating block thickness
2——vane thickness
——vane obliquity
R1——minimum cam radius
R2——maximum cam radius
——gap depth on uprightness in velocity of flow
——gap height
p1——high pressure of gap
p2——low pressure of gap
——gap length
——dynamical mucosity degree of oil
The simulation of power in the pump system
Based on the above analysis and the principles of pump to establish the output power equation.
Parameters selection In the light of all kinds of parameters on the VOP vane pump which was made in Dalian hydraulic component factory, the new pump parameters as follows: (1) the rotational speed from 500 to 3200 r/min, the work pressure: 6MPa; (2) maximum cam radius: 22.6mm, minimum cam radius: 19.3mm, rotor radius: 19mm, number of vanes: 10, floating block thickness: 20mm, vane thickness: 1.4mm;(3) the overall high of floating body designs about4.76 mm, the width of the top floating pieces is 5.0 mm, the high of the arc is about 0.16 mm, and then linked to the rectangle structure is about 5.0 mm width and 0.30 mm high.
Design optimization of fan impeller for dehiscing grains: Using feature-based CAD and flow solver.
Parameters selection In the light of all kinds of parameters on the VOP vane pump which was made in Dalian hydraulic component factory, the new pump parameters as follows: (1) the rotational speed from 500 to 3200 r/min, the work pressure: 6MPa; (2) maximum cam radius: 22.6mm, minimum cam radius: 19.3mm, rotor radius: 19mm, number of vanes: 10, floating block thickness: 20mm, vane thickness: 1.4mm;(3) the overall high of floating body designs about4.76 mm, the width of the top floating pieces is 5.0 mm, the high of the arc is about 0.16 mm, and then linked to the rectangle structure is about 5.0 mm width and 0.30 mm high.
Design optimization of fan impeller for dehiscing grains: Using feature-based CAD and flow solver.
Online since: December 2019
Authors: José Antonio Alves Júnior, Vitoria Gabrieli Malimpensa, João Baptista Baldo
They are composed of refractory aggregates under the appropriate grain size distribution together with special admixtures (minerals or chemicals), all bonded by a hydraulic binder.
d = Particle whose size stablishes an inferior limiting diameter in each grain size range of sieves.
The decrease is more intense for the CRC castable specimen because of its higher CaO content than that of the LCC, being as a consequence prone to develop a bigger number of different phases than the ones possible of being developed on the LCC´s.
On the other hand the deformation observed for the LCC castable formulated under q=0.22 can be credit to the real bigger ratio of matrix/coarse aggregates in this sample, which lead to a decreased hydrodynamic impediment within the liquid phase, which may be caused by the coarse grains, at the same time favoring the reactivity of the fine aggregates (in larger proportions) with the CaO content.
This hypothesis is supported by the results of the combination of high CaO content with q=0.26 grain size modulus distribution, used in the CRC castable formulation.
d = Particle whose size stablishes an inferior limiting diameter in each grain size range of sieves.
The decrease is more intense for the CRC castable specimen because of its higher CaO content than that of the LCC, being as a consequence prone to develop a bigger number of different phases than the ones possible of being developed on the LCC´s.
On the other hand the deformation observed for the LCC castable formulated under q=0.22 can be credit to the real bigger ratio of matrix/coarse aggregates in this sample, which lead to a decreased hydrodynamic impediment within the liquid phase, which may be caused by the coarse grains, at the same time favoring the reactivity of the fine aggregates (in larger proportions) with the CaO content.
This hypothesis is supported by the results of the combination of high CaO content with q=0.26 grain size modulus distribution, used in the CRC castable formulation.