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Online since: May 2017
Authors: Ivailo Terzijski, Lukáš Zvolánek
Input Data for Ageing Coefficient c Calculation.
Thus, the input data for residual stress prediction, i.e. shrinkage and modulus of elasticity development, were measured experimentally.
The concrete mixture labelled as C2 was proposed with respect to reduction of residual stresses due to shrinkage.
Therefore, the C2 contains shrinkage reduction admixture and expansion admixture at the dosage of 3 % and 5 % (by weight of cement content), respectively.
Thus, the input data for residual stress prediction, i.e. shrinkage and modulus of elasticity development, were measured experimentally.
The concrete mixture labelled as C2 was proposed with respect to reduction of residual stresses due to shrinkage.
Therefore, the C2 contains shrinkage reduction admixture and expansion admixture at the dosage of 3 % and 5 % (by weight of cement content), respectively.
Online since: October 2006
Authors: Glenn M. Beheim, Laura J. Evans
This etch rate reduction can be largely attributed to
the 21% reduction in the proportion of process time devoted to etching.
In a separate experiment, using 200-nm-thick evaporated Ni masks, the selectivity to the Ni mask (i.e., ratio of SiC and Ni etch rates) was found to be reduced from 120 to 65 when platen power was increased from 50 to 100 W, at 17-mT (a) (b) Platen power [W] Platen power [W] Pressure [mT] Pressure [mT] Etch rate [µm/min] Etch rate in µm/min Fig. 1 - SiC etch rate as a function of platen power and pressure with a 9-s passivation time: (a) response surface and experimental data points; (b) contour plot of response surface.
If somewhat rougher sidewalls were acceptable, then high platen power, pressure and short passivation time (100 W, 17 mT, 9 s) could be used to obtain the same anisotropy with a higher etch (a) (b) Pressure [mT] Slope [degree] Platen power [W] Platen power [W] Pressure [mT] Slope in degrees Fig. 3 - Sidewall slope as a function of platen power and pressure with a 17-s passivation time: (a) response surface and experimental data points; (b) contour plot of response surface.
In a separate experiment, using 200-nm-thick evaporated Ni masks, the selectivity to the Ni mask (i.e., ratio of SiC and Ni etch rates) was found to be reduced from 120 to 65 when platen power was increased from 50 to 100 W, at 17-mT (a) (b) Platen power [W] Platen power [W] Pressure [mT] Pressure [mT] Etch rate [µm/min] Etch rate in µm/min Fig. 1 - SiC etch rate as a function of platen power and pressure with a 9-s passivation time: (a) response surface and experimental data points; (b) contour plot of response surface.
If somewhat rougher sidewalls were acceptable, then high platen power, pressure and short passivation time (100 W, 17 mT, 9 s) could be used to obtain the same anisotropy with a higher etch (a) (b) Pressure [mT] Slope [degree] Platen power [W] Platen power [W] Pressure [mT] Slope in degrees Fig. 3 - Sidewall slope as a function of platen power and pressure with a 17-s passivation time: (a) response surface and experimental data points; (b) contour plot of response surface.
Online since: November 2012
Authors: Chen Zhang, Santha Santha, Fauziah Shahul Hamid
Therefore, the required data from a FM landfill (Landfill A) and a local landfill site (Landfill B) is to analyze the efficiency of different waste disposal options in Malaysia.
The landfill managers can also benefit from the internal power generation and the reduction in the operational cost.
Indirect benefits are not presented in the data gathering.
It is know that proper closure of landfill sites can gain significant benefits including reduction of the risks to environment and public health, though it is impossible to be quantified.
The landfill managers can also benefit from the internal power generation and the reduction in the operational cost.
Indirect benefits are not presented in the data gathering.
It is know that proper closure of landfill sites can gain significant benefits including reduction of the risks to environment and public health, though it is impossible to be quantified.
Online since: October 2014
Authors: Bian Peng Wu, Ting Feng Tan, Li Gang Bai, Yan Xia Li, Ming Jie Zhang
Compound 3a was obtained at 80°C reflux temperature for 8h by zinc reduction of compound 2a.
Compound 3b was obtained by reduction of 2b using zinc with good yields in 73.63%.
Their absorption and fluorescence emission data in DMF are summarized in Table 1.
Table 1 The absorption and fluorescence emission data in DMF of the compounds 1a, 1b, 2a, 2b, 3a, 3b Compound Absorption lmax [nm] e [L×mol-1×cm-1] lem [nm] Fluoroscence indensity 1a 270 18989 338 217.50 1b 284 14670 339 2937.74 2a 328 21478 - - 2b 298 18939 345 90.56 3a 352 29716 398 2236.23 3b 317 29390 402 3257.75 As shown in Fig. 2 (3a and 3b), a new emission band at 402 nm is newly formed and the fluorescence intensity is gradually enhanced.
Compound 3b was obtained by reduction of 2b using zinc with good yields in 73.63%.
Their absorption and fluorescence emission data in DMF are summarized in Table 1.
Table 1 The absorption and fluorescence emission data in DMF of the compounds 1a, 1b, 2a, 2b, 3a, 3b Compound Absorption lmax [nm] e [L×mol-1×cm-1] lem [nm] Fluoroscence indensity 1a 270 18989 338 217.50 1b 284 14670 339 2937.74 2a 328 21478 - - 2b 298 18939 345 90.56 3a 352 29716 398 2236.23 3b 317 29390 402 3257.75 As shown in Fig. 2 (3a and 3b), a new emission band at 402 nm is newly formed and the fluorescence intensity is gradually enhanced.
Online since: January 2012
Authors: Ju Guo Zhang, Hong Bin Zhu
The results is shown in Table 1
Table 1 Corrosion data of different concentrations of zinc sulfate
Percent of Zinc sulfate (g/L)
0
1
3
5
6
Corrosion potential (v)
-1.75
-1.53
-1.41
-1.32
-1.33
As it can be seen from the above data, the concentration of zinc sulfate in the corrosion inhibitor is 0, the corrosion potential is -1.75, with increasing the concentration , the corrosion potential is -1.36.
It can neutralize acid in water, reduce the hydrogen ion concentration, increase over potential of hydrogen precipitation, so that hydrogen ions in the metal surface reduction was blocked, corrosion was slown down; and also slow speed of response, air bubbles was turned large into intensive small, which prevent foam and boiling phenomenon.
So usually you need to adjust the bath or adjust the concentration ,the concentration is directly related to the relative density or exchange polishing liquid[6]. 3 Summary Using smokeness chemical polishing process to polishe aluminum parts which very close to the three acid polishing.Besides ,polishing cost reduction 5 to 10% than three acid, which is a major feature of this process.
It can neutralize acid in water, reduce the hydrogen ion concentration, increase over potential of hydrogen precipitation, so that hydrogen ions in the metal surface reduction was blocked, corrosion was slown down; and also slow speed of response, air bubbles was turned large into intensive small, which prevent foam and boiling phenomenon.
So usually you need to adjust the bath or adjust the concentration ,the concentration is directly related to the relative density or exchange polishing liquid[6]. 3 Summary Using smokeness chemical polishing process to polishe aluminum parts which very close to the three acid polishing.Besides ,polishing cost reduction 5 to 10% than three acid, which is a major feature of this process.
Wind-Induced Vibration Control and Analysis of Super High-Rise Structure Using Viscous Damping Walls
Online since: January 2014
Authors: Wen Fu He, Yan Guo, Wen Guang Liu, Jian Zhang
Table 3 Structural natural period
Vibration mode
1
2
3
4
5
6
Period (s)
6.57
6.29
3.5
1.98
1.76
1.28
Vibration form
Translation
Translation
Torsion
Translation
Translation
Torsion
Supposing structural maximum acceleration meets the characteristics of stationary random process, extract acceleration time-history data at various points in time, and select the fractile under a certain guaranteed ratio as the maximum acceleration().is peak acceleration, and the maximum value of acceleration time-history data is called maximum instantaneous acceleration.
(a) maximum instantaneous acceleration (b) inter-story displacement Fig. 7 Curve of structural Y-direction maximum instantaneous acceleration and inter-story displacement Table 4 Comparison of structural Y-direction maximum peak acceleration(units: m/s²) Floor number Damping structure Original structure Vibration reduction ratio Floor number Damping structure Original structure Vibration reduction ratio 73 0.241 0.315 23.4% 33 0.075 0.105 28.7% 63 0.179 0.237 24.4% 23 0.046 0.067 31.6% 53 0.143 0.192 25.2% 13 0.022 0.035 38.4% 43 0.109 0.148 26.3% 3 0.004 0.009 57.5% Summary The wind-induced vibration control and analysis of a super high-rise structure located in the area of strong typhoon with viscous damping walls is studied.
(a) maximum instantaneous acceleration (b) inter-story displacement Fig. 7 Curve of structural Y-direction maximum instantaneous acceleration and inter-story displacement Table 4 Comparison of structural Y-direction maximum peak acceleration(units: m/s²) Floor number Damping structure Original structure Vibration reduction ratio Floor number Damping structure Original structure Vibration reduction ratio 73 0.241 0.315 23.4% 33 0.075 0.105 28.7% 63 0.179 0.237 24.4% 23 0.046 0.067 31.6% 53 0.143 0.192 25.2% 13 0.022 0.035 38.4% 43 0.109 0.148 26.3% 3 0.004 0.009 57.5% Summary The wind-induced vibration control and analysis of a super high-rise structure located in the area of strong typhoon with viscous damping walls is studied.
Online since: December 2010
Authors: Wen Sheng Li, Yi Heng He
Influence factors of in-service RC flexural member’s reliability mainly include three categories: safety, durability and applicability, each factor can be subdivided into multiple initial quantitative indicators, such as carbonation depth, concrete strength, cover thickness, etc. which mainly be assessed through on-site testing data, and according to certain criteria to determine its level.
Reference [5 ~ 8] studies have shown that, when steel corrosion section loss ratio is greater than 5%, the performance of reinforcement and component’s bearing capacity both have a large degree of reduction, then the component’s bearing capacity reduction coefficient has reached the serviceability limit states of durability.
Fig. 2, A layer of reinforced concrete frame structure Table 7, The measured values of component reliability index component evaluation of quantitative indicators Capacity attenuation coefficient carbonation depth (mm) concrete strength the cover thickness (mm) steel cross-section loss ratio /% steel corrosion rate %/year crack width (mm) component deformation (mm) KL1 0.980 15.6 21.8 22.3 1.2 0.07 0.12 19 According to the assessment model of RC flexural member′s reliability based on attribute mathematical theory, For KL-1, the classification standard matrix is According to Table 7, the measurement data matrix to determine KL-1 as follows: Thus come to its single-index measure evaluation matrix: According to the actual measured values of the reliability evaluation index of KL-1 to determine the contribution ratio of the component reliability for evaluation index, and according to the formula in reference [12] to calculate the weight coefficient of evaluation index of KL-1, as
Reference [5 ~ 8] studies have shown that, when steel corrosion section loss ratio is greater than 5%, the performance of reinforcement and component’s bearing capacity both have a large degree of reduction, then the component’s bearing capacity reduction coefficient has reached the serviceability limit states of durability.
Fig. 2, A layer of reinforced concrete frame structure Table 7, The measured values of component reliability index component evaluation of quantitative indicators Capacity attenuation coefficient carbonation depth (mm) concrete strength the cover thickness (mm) steel cross-section loss ratio /% steel corrosion rate %/year crack width (mm) component deformation (mm) KL1 0.980 15.6 21.8 22.3 1.2 0.07 0.12 19 According to the assessment model of RC flexural member′s reliability based on attribute mathematical theory, For KL-1, the classification standard matrix is According to Table 7, the measurement data matrix to determine KL-1 as follows: Thus come to its single-index measure evaluation matrix: According to the actual measured values of the reliability evaluation index of KL-1 to determine the contribution ratio of the component reliability for evaluation index, and according to the formula in reference [12] to calculate the weight coefficient of evaluation index of KL-1, as
Online since: June 2015
Authors: Calambras Pulgarin Heidi, Albano Maria Patricia, Garrido Liliana Beatriz
Colloidal processing is an alternative route to ensure a uniform microstructure with a reduction in porosity and grain size leading to significant improvements in the ceramic.
Fig. 4: ln (ln (1/ (1-x))) vs. ln t using experimental data of Fig. 3.
The calculated results using experimental data of sample sintered at 1400 ºC are shown by a line in Fig. 4.
The samples sintered at 1500 ºC exhibited a reduction in the slope ( i.e.
Fig. 4: ln (ln (1/ (1-x))) vs. ln t using experimental data of Fig. 3.
The calculated results using experimental data of sample sintered at 1400 ºC are shown by a line in Fig. 4.
The samples sintered at 1500 ºC exhibited a reduction in the slope ( i.e.
Online since: September 2004
Authors: J.F. Orr, N.J. Dunne
The
most notable condition which has characterised the development of mixing systems has been
reduction of pressure below ambient (0 to -86kPa) with the aim of reducing porosity, however it has
been reported that the resulting increase in apparent density of the PMMA causes increased
volumetric shrinkage up to 7.3% [5].
Modulus values were determined to be in the range 2.11-2.65GPa, depending on pressure reduction during mixing, which concur with previous published results [9].
The system records displacements of recognised surface features, in this case enhanced by sputtered points of black paint, and the data is subsequently differentiated to yield strains [13].
Initial results are encouraging, with indications of forces imposed by curing rings of cement being of the order predicted from earlier strain measurements, however strains are known to vary with radial distance from the interface, so the best data which may be inferred from these measurements are the contact stresses normal to the contacting surfaces.
Modulus values were determined to be in the range 2.11-2.65GPa, depending on pressure reduction during mixing, which concur with previous published results [9].
The system records displacements of recognised surface features, in this case enhanced by sputtered points of black paint, and the data is subsequently differentiated to yield strains [13].
Initial results are encouraging, with indications of forces imposed by curing rings of cement being of the order predicted from earlier strain measurements, however strains are known to vary with radial distance from the interface, so the best data which may be inferred from these measurements are the contact stresses normal to the contacting surfaces.
Online since: March 2010
Authors: Fadi K. Abu-Farha, Mohammed A. Nazzal
For example, the utilization of magnesium (Mg) alloys in
automotive components will yield a significant weight reduction which has a positive effect on fuel
consumption and carbon dioxide emission levels.
The advantages include reduction in tooling cost, improved ductility, ability to form intricate sections, and less secondary operations.
The strength coefficient (k) and strain rate sensitivity (m) were determined by fitting the model to the experimental data of Abu Farha et al. [8] obtained for Mg AZ31 sheets and shown in Fig. 1b.
The reason for doing so is the lack of experimental data on Mg AZ31 tubes.
The advantages include reduction in tooling cost, improved ductility, ability to form intricate sections, and less secondary operations.
The strength coefficient (k) and strain rate sensitivity (m) were determined by fitting the model to the experimental data of Abu Farha et al. [8] obtained for Mg AZ31 sheets and shown in Fig. 1b.
The reason for doing so is the lack of experimental data on Mg AZ31 tubes.