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Online since: September 2005
Authors: Andrei Butsen, Ilona Yakutik, Gvidona Shevchenko, Nikolai Tarasenko
Silver nanoparticles of size 10-30 nm were prepared in a gelatin stabilized AgNO3 solution under reduction with K-Na-tartrate.
This paper presents the results of work on the laser irradiation of silver colloids prepared by the chemical reduction method.
Experimental Silver colloids were prepared by the reduction of a gelatin stabilized ammonia-containing AgNO3 solution with K-Na-tartrate.
Electron diffraction data evidence shows that these structures are not compact but are made up of a great many small silver particles.
Online since: November 2016
Authors: Keun Yeong Oh, Kang Min Lee, Jae Hyuk So, Kwan Sik Park
Therefore, the objective of this study is to investigate reduction of initial clamping force in high-strength bolted connection under fatigue load.
The objective of this study is to investigate reduction of initial clamping force in high-strength bolted connection under fatigue load.
The data used in the test was conducted by applying the analysis.
Test and analysis result of induced 110% axial force specimen showed similar curve and reduction of axial stress.
Online since: September 2016
Authors: Francesco Tondolo, Giuseppe Mancini, Alessandro Cesetti
Moreover, every corroded specimens was demolished in order to extract the reinforcement for a clean and weight procedure in agreement with of G1-90 Standard [7] and for comparison purpose with theoretical data.
The reduction of bond stresses after the peak load is more evident for the unconfined specimens; in particular, they had a bond reduction rate larger then the confined specimens.
Observing the data from 0 to 5% of corrosion for unconfined specimens it can be assumed that initially bond strength, due to the increase of lateral pressure exerted by the rust along the embedment length, takes advantages from it, but when corrosion level exceeds a certain value (between 2% and 5%) bond strength becomes smaller due to the formation of the first crack along the bar.
The electrochemical corrosion method used a low level of current density so as to obtain reliable data for application to real structures.
However, a sudden reduction is showed when higher level of corrosion is reached and corrosion cracks appear; then only very small bond strength is obtained from that level of corrosion onward.
Online since: October 2012
Authors: Feng Zou, Jian Wu Wang
From Eq. 4, it is thus clear that the marginal spectrum is the integration of time-frequency spectrum on the time axis, which reflects the amplitude distribution in every frequency point, and also reflects the accumulative amplitude of the amplitude with the probability meaning in the entire data span.
Extraction Method of Rotor System Fault Feature The extraction method steps of Hilbert marginal spectrum feature of the rotor system vibration signal are shown as follows: (1) The integrated EMD noise reduction disposal is made on the rotor system vibration signal [4], gaining the relatively independent IMF{…}
Application in Extraction of Rotor System Fault Feature In the rotor experiment table, the typical fault experiment of rotor system is conducted, and the data sample of data is gained.
Firstly, the integrated EMD noise reduction is made on the vibration signal, to eliminate the high frequency noise and burr interference.
For the IMF component after the noise reduction, apply the validity check method of mechanical vibration mode, select the vibration mode IMF which can reflect the rotor vibration characteristics, and eliminate the false IMF component.
Online since: September 2013
Authors: Xi Ping Bai
The deformation degree of the cold extruded height The deformation degree of the cold extruded height is shown by high reduction ratio.
According to the data [4],the high reduction ratio is: εh—the reduction ratio of the cold extruded height H0—the original height before the cold extrusion blank changed.
H1—the height after the cold extrusion blank changed = Check the data [5], the allowable degree of deformation of the 20steel cold extrusion is εhmax=65~70%。
The calculation of the extrusion pressure According to the data [6],the extrusion force calculated by the following equation: Type: P-the maximum extrusion pressure F- the compression area after the extrusion is ended 5.The design of the mold structure 5.1.
Online since: July 2013
Authors: Hong Bin Wang, Da Wang, Yi Na Cai, Pu Yong Feng, Xue Fei Peng, Guang Zhi Han
PH suspend solid mg/L Median diameter μm total mineralization mg/L SRB cell/mL TGB cell/mL FB cell/mL mixed injection 6.7 10.482 8.70 8520 130 70 110 D11 6.7 70.744 18.31 7303 600 110 130 Well water 7 6.290 3.20 9505 25 12 36 Table 1 experimental data shows that the suspend solid of well water is basically reach the standards, but mixed water and D11 water are seriously non-compliance.
When the volume of mixed injection is 500ml (38PV), permeability reduction 60.7%; injection volume reached 2500ml (180PV), permeability decrease by 98.4%.
When D11 injection volume is 500ml (38PV), permeability reduction 68.9%; injection volume reached 2500ml (180PV), permeability decreased by 98.6%.
When the injection volume of well water is 500ml (38PV), permeability reduction 21.3%; injection volume reached 2500ml (180PV), permeability decreased only 62.2%.
Conclusions and suggestions Based on the analysis of the above experimental data, the mainly reasons of Suizhong 36-1 oilfield injection well plugging is the intrusion of suspended substances.
Online since: April 2014
Authors: Hong Yan, Jun Luo, En-Hou Han, Rongshi Chen
Mg-2Zn-0.3Gd sheets processed by large strain hot rolling with one pass of 80% reduction at 200°C and 250°C were selected to investigate the rolling temperature effect on the microstructure, texture and mechanical properties of Mg-2Zn-0.3Gd sheets after rolling and subsequent annealing.
Three specimens were used for each test condition to ensure the reproducibility of the data.
Actually, during the multi-pass small reduction hot rolling process Mg alloy usually deformed with basal slipping and tensile twinning due to their lower CRSS.
This microstructure difference is an obvious characterization for Mg-2.0Zn-0.3Gd alloy produced by traditional multi-pass small reduction hot rolling process and large strain hot rolling.
And it can be conclude that the above mentioned microstructure difference most probably related to the element Gd addition and large reduction performed.
Online since: February 2011
Authors: Bo Ding, Yuan De Yin, Wen Hua Meng, Peng Zhan Wang, Sheng Zhi Li, Lan Wei Hu
The novel Fomichev plug described in this paper is of characteristic producing equal unit-reduction of wall thickness along its perforation section during seamless tube piercing, which designed on the base of the roll opening of Julong piercer, taking into account for both feed angle and toe angle of a cone type piercer.
The material model of steel grade P91 is built using the data from a Gleeble test program.
The perforation section generatrix of the novel Fomichev plug discussed in this paper is represented by formula (1): , (1) where RLr(x) is plug diameter at the point x in axial coordinate; R(x) is the roll opening at the point x in axial coordinate; SHE is the ideal wall thickness of hollow shell at the intersection between perforating and smoothing section of the plug; Cav is the average reduction ratio of wall thickness.
This kind of plug is somewhat universal, but its flaw is that the wall-thickness reduction of workpiece focuses on one part of the plug in piercing.
The new plug is of characteristic producing equal unit-reduction of wall thickness along its perforation section during seamless tube piercing without excessive concentration of metal deformation.
Online since: May 2014
Authors: Chao Tian, Jia Liu, Zhao Meng Peng
Testing the optimized system on the same evaluation set, we achieve real-time rate of 0.39, a relative reduction of 45.8%.
However in some off-line applications, which we can get all the speech data instead of just streaming speech,large-size batching method is very effective.
We computed the acoustic probabilities of all the frames in large batch size, and the size depends on the data size and memory size of the system.
And with the optimization methods, the real-time rate of the CD-DNN-HMM system has been improved from 0.72 to 0.39, a relative reduction of 45.8%.
Liu, Improving deep neural network acoustic models using unlabeled data, in Signal and Information Processing (ChinaSIP), 2013 IEEE China Summit & International Conference on. pp. 137–141, IEEE, 2013
Online since: August 2013
Authors: Phillip B. Blankenship, R. Michael Anderson, Kamyar C. Mahboub, Alireza Zeinali
Several mathematical models have been proposed for determining the flow number of a mixture from the test data.
The test temperature was 54°C and three replicate specimens were tested for each data point.
Flow Number Test Data The linear regression analysis was conducted on the flow number data for each mixture to determine the significance and magnitude of the effect that the density of the mixtures had on their resistance to rutting.
The fatigue test data showed that: 1.
Compactibility of the mixtures was evaluated using the compaction data from a Superpave gyratory compactor.
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