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Online since: April 2006
Authors: B.K. Chen, S.Y. Tsay, C.P. Chen
All of the spectroscopic data obtained were in good agreement with the proposed structure.
The increase in Tg can be attributed to the strong interaction between the polymer and silicate surfaces because the nm size restricted segmental motion near the organic-inorganic interface.[5] These data indicate that these PI-clays have fairly high thermal stability.
Therefore, the efficiency of clay for modification of the mechanical properties is primarily determined by the degree of its dispersion in the matrix as demonstrated by XRD data.
The extent of CTE reduction depends on the clay dispersion and the amount of intercalation.
Conclusion The XRD and TEM data indicate that the MMT clay was dispersed in the polymer matrix at a nanometer scale.
Online since: October 2013
Authors: Lei Qiao, Chen Wang, Jun Qiang Bai, Jun Hua
Comparison between experimental data and predicted skin friction coefficient of T3A test could be found in Fig.  2 above.
Transition prediction of Menter’s transition model that embedded in RANS method has good agreement with experimental data.
At the trailing edge, the flattened pressure gradient appeared in experimental data indicating a turbulent separation.
It is clearly visible that the TDDES result is in good agreement with measured data and TDES over predicted the trailing edge separation.
The eddy viscosity reduction can make the TDES model fail to capture the transition onset on T3A plate.
Online since: April 2015
Authors: Eun Hye Kim, Davi Bastos Martins de Oliveira
The SHPB consisted of a gas gun, a laser module, an oscilloscope, a projectile (striker), two long steel rods (bars), strain gages, amplifiers, and a data acquisition system (Fig. 1).
The wave transformations were recorded in a data acquisition system and assisted with amplifiers, using an AC power supply.
SHPB tests for Red sandstone were performed at 20 m/sec of impact velocity, equivalent to ~100 psi of gas gun pressure, whereas for Buff sandstone tests were conducted at 15 m/sec of impact velocity (~75 psi) to minimize noise of data, because mechanical strength of Buff sandstone is significantly weaker than Red sandstone.
Outliers of the experiments, which were higher by two times or more than average values, were not included in the data analyses.
The reduction of maximum stress and maximum strain rate by hydration was almost identical regardless of the porosity of sandstones.
Online since: August 2016
Authors: Xiu Xin Wang, Zheng Gang Lu
The reduction in calcium ions is usually attributed to the presence and the condition of fly ash.
Considering the above factors, the formula in literature[8] is adopted to calculate the apparent activation energy of cement: (3) Where T0 is the datum temperature(=-10℃), w/b the water-binder ratio, β the ratio of ultimate degree of hydration at temperature T to ultimate degree of hydration at reference temperature Tr, which can be approximated by β=1.1-0.004T.
By using the data optimization schedule in Matlab software, a two-parameter fitting was carried out upon the experimental data, and the best-fitting results are listed in Table 3.
Fig.3 The adiabatic temperature rise of concrete based on equivalent age Table 3 θu and M values of the concrete No 1 2 3 4 5 6 7 8 θu /℃ 33.78 32.26 31.55 31.25 29.94 28.49 26.39 25.45 M/d 2.02 2.77 2.79 2.06 2.91 3.12 3.31 3.37 As shown in Table 3, M gradually reduces with the decrease of w/b ratios, which illustrates that the adiabatic temperature rise based on equivalent age will be accelerated with the reduction of w/b ratio.
The analysis of the experiment data shows that concrete with lower water-binder ratio has smaller heat release coefficient, while the addition of fly ash can lead to a significant decrease in the rate of heat release.
Online since: December 2011
Authors: Apu Sarkar, J.K. Chakravartty
We compare our results with experimental data and find that they are in good agreement with the available experimental evidence.
Simulation on Magnesium with random texture Magnesium alloys have attracted great attention in recent years due to their potential application in the automobile industry for improving fuel efficiency through vehicle weight reduction.
In this work we have used these data to model the deformation characteristics of Mg.
We have activated these four different deformation modes to match the simulated stress-strain curve with the experimental data.
It can be seen that the simulated curves match very well the experimental data.
Online since: February 2014
Authors: Bin Tao, Xiao Han Yao, Jin Hong Ma
According to the production data of a rolling H-beam factory, the FE model of hot continuous rolling process of H-beam is built.
In which ——Datum deformation resistance, that is resistance in condition of =1000℃, and s-1 ——the degree of deformation (logarithmic strain); ——the deformation speed; , ——the regression coefficient, whose value depends on the steel grade For the 25 steel, =150.6MPa, , , , , , .
On the other hand, at same reduction rate, the larger the flange thickness, longer the deformation zone is, consequently, greater the longitudinal deformation resistance, the greater the flange spread is according to the least resistance rule.
Online since: February 2015
Authors: Li Zhao, Shi Gang Cui, Li Guo Tian, Fan Liang, Jia Jia Xie
● Read The Serial Data The environmental data collection module achieves serial communication with Android software, and sends sensor data to the serial port.
Android application reads serial data(i.e.
,all environmental data).
The sensors collect data once per 10 seconds.
The environmental data and video data could be received by the server and stored in the database.
Online since: December 2006
Authors: Bong Tae Han, Seung Min Cho, Yuri Lee, Samson Yoon
The comparison reveals that a low ramp rate of typical accelerated thermal cycling (ATC) tests causes significant reduction in the maximum level of elastic energy in the package assembly.
The reduction of the bending displacement was caused by stress relaxation within the flex substrate and the underfill layer during cooling.
This process set a reference datum (apparent null field) at the replication temperature
Online since: July 2011
Authors: De Xin Zhang, Wei Guang An, Zuo Xiang Fan, Lei Liu
In order to make the resistance underwater as small as possible, the shape of cavitator has been studied, and supercavitation resistance and drag reduction which related to the foreign experimental results is discussed.
The results obtained from the current curve and the theoretical data have some gaps.
Online since: February 2013
Authors: H. Çimenoğlu, Fared Seahjani, Meltem Ipekci
In addition, nitriding provided a reduction in friction coefficient and an enhancement in wear resistance against an alumina ball under dry sliding conditions.
During wear tests, the frictional force data was constantly recorded.
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