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Online since: January 2014
Authors: Mei Yu, Chun Juan Fu, Rong Bao Ma, Rui Yang Wang, Jian Hua Liu
After the samples were immersed in the NaCl 3.5% for 1 hour, a Tafel-type fit of the data was performed to estimate the corrosion rate.
Fig.2, Polarization curves for different aged samples Table 4, Electrochemical parameters for different aged samples Sample No. jcorr/V icorr/( A·cm-2) AT1 -0.78 5.012×10-6 AT2 -0.76 3.981×10-6 AT3 -0.8 10-5 AT4 -0.77 6.310×10-6 Rpo Rt Rs Cdl Cm Fig.3, Nyquist impedance diagram for different aged samples and the proposed equivalent circuit Table 5, Electrochemical impedance data of electrical elements proposed in the equivalent circuit Sample No.
The data for the electrical elements of different aged samples are listed in Table 5.
Generally speaking, decrease in the Cdl value shows the increase thickness of the film, conversely, an increase in the Cdl value indicates the reduction of the film thickness.
Fig.2, Polarization curves for different aged samples Table 4, Electrochemical parameters for different aged samples Sample No. jcorr/V icorr/( A·cm-2) AT1 -0.78 5.012×10-6 AT2 -0.76 3.981×10-6 AT3 -0.8 10-5 AT4 -0.77 6.310×10-6 Rpo Rt Rs Cdl Cm Fig.3, Nyquist impedance diagram for different aged samples and the proposed equivalent circuit Table 5, Electrochemical impedance data of electrical elements proposed in the equivalent circuit Sample No.
The data for the electrical elements of different aged samples are listed in Table 5.
Generally speaking, decrease in the Cdl value shows the increase thickness of the film, conversely, an increase in the Cdl value indicates the reduction of the film thickness.
Online since: September 2013
Authors: Qiang Wang, Qi Zhong, Gang Zhou, Yang Zhang, Kai Yang
The SO2 emission has an observable reduction and even the SO2 emission of some sources is lower than 50ppm.
The measurement data of all the instruments were recorded once in five minutes and ten group data were obtained for comparison.
According to the data shown in Fig.1~Fig.5, the performance of three analyzers is much better than the reference technical indicators given in Table.4.
The measurement data of all the instruments were recorded once in five minutes and ten group data were obtained for comparison.
According to the data shown in Fig.1~Fig.5, the performance of three analyzers is much better than the reference technical indicators given in Table.4.
Online since: January 2012
Authors: Huai Ping Feng, Chao Liang Ye, Yao Jun Liu
Table 2 The data statistics of heavy DPT (N/10cm)
piles
number
Maximum value
Minimium value
average
Standard deviation
Design value
250#
62
66
22
44.7
12.07
20
409#
75
54
20
36.5
9.83
20
529#
85
79
25
39.4
15.67
20
609#
46
83
23
40.5
12.4
20
642#
52
53
20
34.4
12.1
20
933#
84
89
21
40.7
19.23
20
The density of piles
Table 2 shows the data of piles by using of heavy DPT.
The experiment show that this method is more appropriate, and the data of discrete small, short time.
Uplift behavior around piles During construction of gravel pile in the pile head, due to the reduction of lateral pressure and vertical pressure from the cover, soil will uplift.
The experiment show that this method is more appropriate, and the data of discrete small, short time.
Uplift behavior around piles During construction of gravel pile in the pile head, due to the reduction of lateral pressure and vertical pressure from the cover, soil will uplift.
Online since: April 2013
Authors: Bernd-Arno Behrens, Richard Krimm, Thomas Nitschke
Currently, this effect will be compensated with help of:
• Mechanical energy storages (electrically coupled flywheel)
• Electrical energy storages (array of capacitors) [9, 10, 11]
Both types of energy storage systems allow buffering of electric energy and a thus reduction of AC power peaks in the electricity grid.
The geometric data of the virtually designed eccentric drive based on real data from an existing eccentric press.
The obtained data are the basis for the implementation and optimization of the novel drive concept.
The geometric data of the virtually designed eccentric drive based on real data from an existing eccentric press.
The obtained data are the basis for the implementation and optimization of the novel drive concept.
Online since: December 2013
Authors: Krishnan Jayaraman, Nawawi Chouw, Li Bo Yan
Readings of the strain gauges and LVDTs were taken using a data logging system.
Readings of the load, strain gauges and LVDT were taken using a data logging system.
This data indicates that the two different types of FFRP confinements increase the ductility of the concrete cylinder remarkably.
The reduction in ultimate strength of FFRP-wrapped PC and CFRC are 15.0% (from 62.2 MPa to 52.9 MPa) and 16.3% (from 58.2 MPa to 48.7 MPa), respectively.
Readings of the load, strain gauges and LVDT were taken using a data logging system.
This data indicates that the two different types of FFRP confinements increase the ductility of the concrete cylinder remarkably.
The reduction in ultimate strength of FFRP-wrapped PC and CFRC are 15.0% (from 62.2 MPa to 52.9 MPa) and 16.3% (from 58.2 MPa to 48.7 MPa), respectively.
Online since: March 2013
Authors: Robert Starosta
By computer program ‘Elfit - corrosion polarization data fitting program’ the value of corrosion current density was made calculation [5-6].
In an environment of sulfuric acid solution, it was found that 45% of alumina caused a reduction in the average value of the potential corrosion (Ecorr) coatings to from about -103 mV to -192 mV for the alloy coating (Fig. 3).
The equivalent circuit used for modelling the recorded data Table 1.
Resistances of plasma sprayed coatings(values) Coating Rs [Wcm2] Rct [Wcm2] Average Average Standard deviation Environment: 0.01 M H2SO4 Ni-Al 7 1500 157 Ni-Al-15%Al2O3 8 1321 98 Ni-Al-30%Al2O3 7 1254 121 Ni-Al-45%Al2O3 6 1105 138 Environment: 3.5% NaCl Ni-Al 1 1954 380 Ni-Al-15%Al2O3 0,42 2058 177 Ni-Al-30%Al2O3 28 4242 575 Ni-Al-45%Al2O3 5 4280 457 Data were analysed using the equivalent circuit shown in Fig. 2.
In an environment of sulfuric acid solution, it was found that 45% of alumina caused a reduction in the average value of the potential corrosion (Ecorr) coatings to from about -103 mV to -192 mV for the alloy coating (Fig. 3).
The equivalent circuit used for modelling the recorded data Table 1.
Resistances of plasma sprayed coatings(values) Coating Rs [Wcm2] Rct [Wcm2] Average Average Standard deviation Environment: 0.01 M H2SO4 Ni-Al 7 1500 157 Ni-Al-15%Al2O3 8 1321 98 Ni-Al-30%Al2O3 7 1254 121 Ni-Al-45%Al2O3 6 1105 138 Environment: 3.5% NaCl Ni-Al 1 1954 380 Ni-Al-15%Al2O3 0,42 2058 177 Ni-Al-30%Al2O3 28 4242 575 Ni-Al-45%Al2O3 5 4280 457 Data were analysed using the equivalent circuit shown in Fig. 2.
Online since: February 2012
Authors: Cătălin Alexandru
Introduction
Important publications reveal a growing interest in analysis methods for multi-body systems (MBS) that may facilitate the self-formulating algorithms, having as a main goal the reduction of the processing time in order to make possible real time simulation [1,2].
Optimization Algorithm In the virtual prototyping concept, the steps to create the digital model of a mechanical system mirror the same steps to create the physical model, as follows: build (modeling parts, constrain the parts, create forces), test (measure characteristics, perform simulation, review animation), validate (import test data, superimpose test data), refine (add friction, add flexible components - compliant parts and joints, add automatic systems that control the operating performance), and optimize.
Constraints can involve the simulation results, or they can constrain overall size, weight, and other factors that depend only on model data.
Optimization Algorithm In the virtual prototyping concept, the steps to create the digital model of a mechanical system mirror the same steps to create the physical model, as follows: build (modeling parts, constrain the parts, create forces), test (measure characteristics, perform simulation, review animation), validate (import test data, superimpose test data), refine (add friction, add flexible components - compliant parts and joints, add automatic systems that control the operating performance), and optimize.
Constraints can involve the simulation results, or they can constrain overall size, weight, and other factors that depend only on model data.
Online since: March 2012
Authors: Xin Chen, Jun Long Zhou
After solving, time-domain of 9 monitoring points pressure were got and then through FFT transformation, spectral data of each monitoring point can be obtained.
In the data of monitoring points 1/2/3(Fig. 5/6/7), we can find that whether in low-frequency or in high-frequency, sound pressure level of up-raised rearview are higher than the down- raised type both in point 1 and point 2.
Data shows that up-raised rearview cover is more conducive to reduce interior noise.
The noise reduction effect is very obvious.
In the data of monitoring points 1/2/3(Fig. 5/6/7), we can find that whether in low-frequency or in high-frequency, sound pressure level of up-raised rearview are higher than the down- raised type both in point 1 and point 2.
Data shows that up-raised rearview cover is more conducive to reduce interior noise.
The noise reduction effect is very obvious.
Online since: October 2006
Authors: Karin Popa, Rudy J.M. Konings, Daniel Bouëxière, A. Florin Popa, T. Geisler
Crystal data of the room temperature phase of some BaM
IV(PO4)2 compounds.
The most likely space groups can be determined based on Raman data: the number of Raman active internal PO4 vibration modes decrease from nine to six at the phase transition, which was observed around 730 K (Fig. 3a).
Group theoretical considerations for the high-temperature polymorph of BaZr(PO4)2 have shown that the reduction of the number of Raman bands is only be consistent with a trigonal structure, where the Ba and Zr atoms are located at a D3d site, the P and two O at a C3v, and six O atoms at a Cs site in the D3d factor group [8].
Analogous to BaZr(PO4)2 , we determined the crystal class and thus the most likely space groups of this polymorph based on Raman data.
The most likely space groups can be determined based on Raman data: the number of Raman active internal PO4 vibration modes decrease from nine to six at the phase transition, which was observed around 730 K (Fig. 3a).
Group theoretical considerations for the high-temperature polymorph of BaZr(PO4)2 have shown that the reduction of the number of Raman bands is only be consistent with a trigonal structure, where the Ba and Zr atoms are located at a D3d site, the P and two O at a C3v, and six O atoms at a Cs site in the D3d factor group [8].
Analogous to BaZr(PO4)2 , we determined the crystal class and thus the most likely space groups of this polymorph based on Raman data.
Online since: October 2010
Authors: Guo Jun Liu, Yong Qing Yang, Fan Guo
Introduction
In decades or even hundreds of years' service, due to loading, fatigue effect, corrosion effect, material
aging and other various unfavorable factors, the bridge will inevitably has the cumulative damages,
resistance attenuation, function reduction, even leading to unexpected incidents.
Common classifications of overall damage identification techniques are as follow: identification based on dynamic testing and damage identification based on static test methods according to the source of the data; dynamic fingerprints and model updating method according to whether the inversion occurs.
Such fingerprints are obtained through linear and nonlinear dynamic processing of time-displacement data.
References [1] Huang Shengnan, Studies on the Damage Identification of Reinforced Concrete Girder Bridges [D], Tsinghua University. (2008) [2] Jiang Hua, Research on Bridge's Damage Detection and Evaluation Based on Static Test Data [D], Southwest Jiaotong University. (2005) [3] Shan Deshan, Smart Bridge Health Monitoring and Damage Diagnosis [M], China Communications Press. (2010) [4] Ran Zhihong, Study of Dynamic Fingerprint Methodology in Damage Identification of Bridge Structures [D], Southwest Jiaotong University. (2005) [5] Wang Zhongdong, Structural Damage Detection Based on The Method of the Residual Modal Forces Analysis, Journal of Jilin University of Technology (Natural Sciences), Vol. 29, 1999, pp.61-66
Common classifications of overall damage identification techniques are as follow: identification based on dynamic testing and damage identification based on static test methods according to the source of the data; dynamic fingerprints and model updating method according to whether the inversion occurs.
Such fingerprints are obtained through linear and nonlinear dynamic processing of time-displacement data.
References [1] Huang Shengnan, Studies on the Damage Identification of Reinforced Concrete Girder Bridges [D], Tsinghua University. (2008) [2] Jiang Hua, Research on Bridge's Damage Detection and Evaluation Based on Static Test Data [D], Southwest Jiaotong University. (2005) [3] Shan Deshan, Smart Bridge Health Monitoring and Damage Diagnosis [M], China Communications Press. (2010) [4] Ran Zhihong, Study of Dynamic Fingerprint Methodology in Damage Identification of Bridge Structures [D], Southwest Jiaotong University. (2005) [5] Wang Zhongdong, Structural Damage Detection Based on The Method of the Residual Modal Forces Analysis, Journal of Jilin University of Technology (Natural Sciences), Vol. 29, 1999, pp.61-66