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Online since: July 2013
Authors: Andreas Kyprianou, Andreas Tjirkallis, George Vessiaris
Figure 1: 3DOF mass(mi)–spring(ki)–damper(ci) system.
Table 1.
Damaged Constant Temp. m1 = m2 = m3 [Kg] 1 1 k1 = k2 = k3 = k4 [N/m] k1 = k2 = k3 = k4 = 450 change of k2=225 c1 = c2 = c3 = c4 [Ns/m] 0.2 0.2 Initially the system under consideration is an intact system under a constant temperature, under the application of the excitation force F(t), using the system parameters, shown in Table 1.
Time response, CWT and decay lines of the WTMM at a distance of 479.19mm from the fixed-end of the cantilever beam, in intact (a,b) and damaged (c,d) states.
The time domain responses, CWT, and Decay lines of WTMM for a specific points at a distance of 479.19mm [311th pixel] from the fixed-end of the beam both for an intact and damaged case, obtained using the proposed methodology, are shown in Figure 9.
Online since: June 2017
Authors: Marek Bednar, Jan Snopko, Jana Chabronova
(Fig. 1) [1].
Five sensors were embedded in the centre of crown in each measuring profile (see Table 1).
Cracks with maximal width of less than 2.0 mm have been identified mainly in unreinforced blocks in the section of blocks No. 436–479 and sporadically in the further part of tunnel as well.
By detailed passportization, it has been found out that: - Longitudinal cracks are sporadically located among blocks No. 1 – 248, specifically in 42 blocks (concreting of secondary lining has been provided by subject No. 1) - The most notable scope of longitudinal cracks is located among blocks No. 249 – 479, in principle in all blocks besides reinforced ones and emergency niches blocks (concreting of secondary lining has been provided by subject No. 2) - Location of cracks as well as width of cracks is recorded in detail within drawings attachment No.: A011-175-103 – Blocks schema
References [1] N.
Online since: December 2010
Authors: Xi Bao Li, Gang Qin Shao, Bo Lin Wu, Jian Wang, Xiao Hua Yu, Hong Xing Gu, Shi Xi Ouyang
Three main polymorphs have been identified as α (monoclinic), β (orthorhombic) and γ (tetragonal) phases, which were stable over various temperature ranges [1-2].
After drying the mixture was heated in a platinum boat at 800 - 1450°C for 1 hour and then furnace cooling.
The heating rate was maintained at 10 °C·min-1 from room temperature to 800 °C.
References [1] G.
Vol. 479 (2009), p. 107
Online since: June 2009
Authors: Ser Tong Quek, Xiao Yan Hou, Viet Anh Tran
Invoking the orthonormal property of V, post-multiplying Eq. (2) by V on both sides gives [ ] [ ] 1 0 1 1 , ∆ ∆ = F V F V U S 0 (4) from which F∆V0 = 0.
Total number of points 1600 1600 1600 1600 1600 1600 Lost percentage (%) 22.00 23.75 24.50 23.50 19.00 23.25 Number of iterations 12 14 14 11 14 10 Number of frequencies used in the last iteration 479 467 495 367 479 343 Relative error at the last iteration (%) 0.62 0.33 0.55 0.72 0.87 0.83 Table 4 Computational details for signal reconstruction at 6 sensor nodes Note: see Fig. 4 for sensor node locations.
Set number Sensors at nodes 1 [1, 2, 3, 5, 8, 9] 1 8 2 [1, 2, 3, 5, 8] 4 5 8 12 14 3 [2, 3, 5, 8, 9] 1 4 8 12 Potential damaged elements Table 5 Damaged detection of experimental truss structure Fig. 1.
Block diagram for data loss reconstruction algorithm Column Tube Beam Beam Element 7 end 1 end 1 (2) Element 18 (7) end 2 Element 18 10m 5m 5m 5m 5m 10m 20m 4m 4m 1m 9m 12 13 199 8 4 1 2 1 95 20 14 15 16 13 21 22 10 12 17 18 10 11 7 8 6 3 4 5 6 7 2 3 1 - element number 1 - node number Column 11 Fig. 3.
Quek: Proceeding of The Twenty-first KKCNN symposium on Civil Engineering, 27-28, Oct, Singapore (2008), p. 105. 3m 1m 1m 1m 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 1m m2 1 2 3 4 5 6 7 8 9 10 1 - element number 1 - node number /2
Online since: May 2014
Authors: Li Yang Xie, Xue Hong He, Zhi Liang Hu, Xi Jie Zhai
(1) Assume the change trend of operation reliability (curve 1) is in accordance with exponential distribution, and can be expressed as , (1) where i means the i times maintenance, when i=0, it means the initial state of system, that is to say t0=0,R0=1; Set the system failure rate λ is fixed value, that is to say λ=c, (λ>0)
Therefore, in the perspective of economy, it may have not need to maintain again. 4 Application of time-variant reliability maintenance model with Weibull distribution operation reliability 4.1 Basic assumptions of the model (1)Assume the initial reliability is 1 and no minimum guarantee life, so the change trend of operation reliability (curve 1) is accordance with two parameter Weibull distribution [9], and can be expressed as , (11) where i means the i times maintenance, when i=0, it means the initial state of system, that is to say t0=0,R0=1; Set η as characteristic life and m as shape parameter, they are fixed value
Proceedings of the 7th International Conference on Properties and Applications of Dielectric Materials, June 2003, 1-5, Nagoya: 479-482
AIIE Transactions, 1994, 1(3): 221-228
Proceedings of the 7th International Conference on Properties and Applications of Dielectric Materials, June 2003, 1-5, Nagoya: 479-482
Online since: February 2020
Authors: Anişoara Băbălau
This category can in turn be divided into: real taxes (the taxes imposed on material objects) and personal taxes (which refer to the taxable subject) [1].
Barboussestreet, Alexandru cel Bunstreet,Petuniilor street, Bucovăț street, Ecaterina Teodoroiu street, Șoimului street, 1 Maiboulevard
 - South: 1 Maiboulevard, Unirii street, Corneliu Coposustreet, Ana Ipătescustreet, Anul1848street
- Zone B is determined by the territory between the streets: - West: Eastern limit of Izvorul Rece locality, Calea Severinului, CanalHC 200, Canal HC 181/1, boundary within the city to the intersection with De 1, boundarywestern property of S.C.
References [1] Dan DROSU ŞAGUNA, Pătru ROTARU, Financial and budgetary law, Syntheses and tests, All Beck Publishing House, Bucharest, 2003
Online since: March 2015
Authors: Xiu Chen Zhao, Ying Liu, Jing Wei Cheng, Xue Chao Zhang, Bing Zheng, Ping Chen
Journal of alloys and compounds 486.1 (2009): 474-479. ] reported that the Ni addition had a positive effect on the growth of (Cu, Ni)6Sn5 layer but negative effect on the growth of Cu3Sn layer around the interface between Sn–3.8Ag–0.7Cu–xNi solder and Cu substrate during isothermal aging condition and that the IMC grains are refined with the Ni addition increasing.
Powder metallurgy route was used to synthesize the solders with compositions of Sn-1.0Ag, Sn-1.0Ag-0.2Ni (wt.%).
Thereafter solders Sn-1.0Ag, Sn-1.0Ag-0.2Ni (wt.%) were merely referred to as SA and SA-Ni respectively.
Fig. 4 Typical cross-section micrographs of BSEM of the diffusion couples Sn-1.0Ag, Sn-1.0Ag-0.025Ni, Sn-1.0Ag-0.05Ni, Sn-1.0Ag-0.1Ni, Sn-1.0Ag-0.2Ni and Cu isothermal aged at 423K (150◦C) for 360h Fig. 5 The thickness of (a) total IMC and (b) Cu3Sn in the diffusion couples Sn-1.0Ag, Sn-1.0Ag-0.025Ni, Sn-1.0Ag-0.05Ni, Sn-1.0Ag-0.1Ni, Sn-1.0Ag-0.2Ni and Cu isothermal aged at 423K (150◦C) for 360h Typical cross-section micrographs of BSEM of the diffusion couples Sn-1.0Ag, Sn-1.0Ag-0.025Ni, Sn-1.0Ag-0.05Ni, Sn-1.0Ag-0.1Ni, Sn-1.0Ag-0.2Ni and Cu isothermal aged at 423K (150◦C) for 360h are shown in Fig. 4, and the thickness of IMCs was counted in Fig. 5.
Boer, Physica B 100 (1980) 1–28. ].
Online since: November 2011
Authors: Weerapol Namboonruang, Rattanakorn Rawangkul, Wanchai Yodsudjai, Nutthanun Suphadon
1 Year Long Term on Strength Properties of Pozzolanics Local Soil Bricks W.
The significant property of fly ash is increasing the durability of materials [1,2].
Its surface is rough as shown in figure 1(a).
Figure 1(b) shows the shape and particle group of Mae-moh fly ash.
(a) (b) Fig.1.
Online since: April 2008
Authors: Chang Qi Chen, Zhong Kui Zhao, Qing Zhou Sun, Pu Qing Zhang, Chang Long Li, Xue Jiu Wang
Effect of Zinc Content on the Ageing Behavior of Al-Zn-Mg-Cu-Li Alloys ZHAO Zhongkui1,a , SUN Qingzhou1,b , ZHANG Puqing 1,c, Li Changlong1,d , WANG Xuejiu2,e and CHEN Changqi 3,f 1 Materials Science and Engineering School, Shandong Jianzhu University, Jinan 250101, P.
In this paper, Al-5.6Zn-2.8Mg-1.6Cu-0.24Cr-1.1Li, Al-8.0Zn-2.4Mg-2.4Cu-1.1Li-0.18Zr and Al-11.8Zn-2.9Mg-2.8Cu-1.1Li-0.24Zr (in wt%) alloys were artificially aged at 80,100,120,140 and 160°C for different time, respectively.
Experimental The alloys with various compositions of Al-5.6Zn-2.8Mg-1.6Cu-0.24Cr-1.1Li (alloy A), Al-8.0Zn-2.4Mg-2.4Cu-1.1Li-0.18Zr (alloy B) and Al-11.8Zn-2.9Mg-2.8Cu-1.1Li-0.24Zr (alloy C) (in wt.%) were melted in a vacuum furnace and then were cast in a water cooled mould under argon.
References [1] Zs.
Forum Vol. 475-479 (2005), p 325 [7] Z.K.
Online since: March 2016
Authors: Wei Han, Hui Ding, Wei Jin Chen, Jun Xiang, Jia Huan Xu
The total conductivities at 800oC were 3.8 × 10-3 S·cm-1 (x = 0), 8.0 × 10-3 S· cm-1 (x = 0.1), 2.5 × 10-2 S· cm-1 (x = 0.2), 1.36 × 10-2 S ·cm-1 (x = 0.3).
For x=0 sample, there appears two peaks 508 cm-1 and 415 cm-1 , which move to lower frequencies (495 cm-1,415 cm-1) in x=0.1 sample.
There is only one peak in higher dopant samples (x=0.2, 0.3) between 400-650 cm-1 and two peaks (near to 1426 cm-1, 858 cm-1).
Alloys Compd.. 479(2009) L40-L42
Alloys Compd.. 479(2009) L36- L39
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