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Online since: November 2013
Authors: Zhe Qiao, Xue Feng She, Qing Guo Xue, Jing Song Wang
All the data above shows that there is a large gap in by-product gas recovery between our country and international advanced level, and it has a large room for improvement [4][5].
Utilization of by-product gases and development of emission-reduction technology in Baosteel [J].
Utilization of by-product gases and development of emission-reduction technology in Baosteel [J].
Online since: February 2015
Authors: M.B. Maros, Alexandra Kitti Németh
Results of the strength tests on the original and modified concrete material
Here should be mentioned that prescriptions of standards for the minimum strength data and composition (namely water/cement ratio) are occasionally in contradiction [[] Troli, R., Collepardi, M.: Technical contradictions in the European Norm EN 206 for concrete durability, http://www.inti.gob.ar/cirsoc/pdf/tecnologia_hormigon/europeNorm206.pdf
].
Though a concrete with excess fine particle content can easily be transported with pump, additives that are required to compensate the accompanying strength reduction may cause significant increase in the costs.
Though a concrete with excess fine particle content can easily be transported with pump, additives that are required to compensate the accompanying strength reduction may cause significant increase in the costs.
Online since: May 2014
Authors: Zuo Ming Liu, Zi Qiang Xi, Chen Guang Yu
nonzero vector, and lag 60°in turn anticlockwise, the six nonzero vectors make the space divided into six sections Ⅰ ~Ⅵ, every sector is 60° :
Figure 2 Two level space vector diagram
Literature[3] takes the sectionⅠas an example, in corresponding with the regular sampling method which is shown in figure 1 , after analyzing the relationship between them , the equation (4) can be obtained, in which T00, T07 stand for the action time of the the two zero vectors V0 and V7 in figure 2 respectively:
(4)
then combining equation (3) we can get the unified expression of the three-phase voltage modulation in the scope of the entire 360° of the voltage space vector pulse width modulation:
(5)
In the equation(4), the value of k is in the range of 0 ~ 1, VA*, VC*, VB * are modulation wave data
The simulation results show that the discrete modulation method developing from the space vector modulation can applies in the cascade multilevel modulation, and can get similar results with the two level, such as the reduction of switching loss and harmonic distortion, and the final output line voltage waveform and its amplitude are not affected.
The simulation results show that the discrete modulation method developing from the space vector modulation can applies in the cascade multilevel modulation, and can get similar results with the two level, such as the reduction of switching loss and harmonic distortion, and the final output line voltage waveform and its amplitude are not affected.
Effect of Equal-Channel Angular Pressing Passes on Corrosion Behavior of Ultrafine-Grained Pure Iron
Online since: March 2015
Authors: Jing Hua Jiang, Liu Yan Zhang, Hui Shu Wu, Hai Bin Yu, Aibin Ma
After fitting the EIS data using Rs(QRt), the Rt values of the as-cast and UFG samples are 15.28 kohm cm2 and 22.45 kohm cm2, respectively.
The slightly larger passive current densities of the annealed ECAPed samples than those of the unannealed counterparts are caused by the reduction of dislocation density and the increase in grain size.
The slightly larger passive current densities of the annealed ECAPed samples than those of the unannealed counterparts are caused by the reduction of dislocation density and the increase in grain size.
Online since: July 2015
Authors: Igor A. Polozov, Vadim Sufiiarov, Evgenii Borisov, Anatoliy Popovich
Results and discussion
Table 2 summarizes XRD data for the initial powders and compact samples before and after heat treatment.
Analysis and simulation of the process of dendritic inhomogeneity formation in steel towards its reduction (in Russian).
Analysis and simulation of the process of dendritic inhomogeneity formation in steel towards its reduction (in Russian).
Online since: January 2012
Authors: Hu Ping Yang, Yao Xing Zhong, Wei Ling Wu
Copper-plated steel can play a good reduction in resistance.
Grounding resistance estimation By grounding resistance estimation formula: by Generation into data, less than regulations sets grounding resistance by less than 0.5 Ω.
Grounding resistance estimation By grounding resistance estimation formula: by Generation into data, less than regulations sets grounding resistance by less than 0.5 Ω.
Online since: January 2019
Authors: Jiří Zach, Jitka Hroudová, Azra Korjenic
An extreme reduction in thermal conductivity was achieved in all samples under vacuum.
The obtained data shows that sample 5 from the five materials tested exhibited the best thermal insulation properties under reduced pressure.
The obtained data shows that sample 5 from the five materials tested exhibited the best thermal insulation properties under reduced pressure.
Online since: July 2018
Authors: Daniel Barba, Roger Reed, Enrique Alabort
In order to evaluate their microstructural architecture, electron backscattered
Table 1: Experimentally measured chemical compositions compared with standard data for each titanium
alloy (wt. %)
Al V Fe C N Ti
Ti-6Al-4V
Typical (min-max) 5.5-6.5 3.5-4.5 0-0.25 0-0.08 0-0.05 Bal.
The microstrucural characteristics have an effect on this transition: an increase on the mean grain size and an strengthening of the crystallographic texture might be responsible for the reduction of the grain boundary sliding regime (region II) and an increase of the flow stress.
The microstrucural characteristics have an effect on this transition: an increase on the mean grain size and an strengthening of the crystallographic texture might be responsible for the reduction of the grain boundary sliding regime (region II) and an increase of the flow stress.
Online since: February 2013
Authors: Yong Tian Wang, Zi Gong Xue, Yuan Xun Huang, Xiao Jing Hai
The tensile data is illustrated in Fig.6.
We think that the problem may have the following reasons: firstly, it’s easy for the brittleness of the TiAl intermetallic compound to produce micro-cracks with thermal stress in the rapid melting process, reducing grain boundary cohesion, therefore, resulting in a reduction of strength; secondly, laser melting treasure is a non- equilibrium solidification process with the fine equiaxed grain produced, some of unstable brittle α2 phase have been observed in the grain boundary, which is related with the typical brittle fracture morphology feature in Figure 8.
We think that the problem may have the following reasons: firstly, it’s easy for the brittleness of the TiAl intermetallic compound to produce micro-cracks with thermal stress in the rapid melting process, reducing grain boundary cohesion, therefore, resulting in a reduction of strength; secondly, laser melting treasure is a non- equilibrium solidification process with the fine equiaxed grain produced, some of unstable brittle α2 phase have been observed in the grain boundary, which is related with the typical brittle fracture morphology feature in Figure 8.