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Online since: October 2014
Authors: J.L. Zhou, Shu Qian Wu, G.Q. Wu
Comparison of the top structure of the noise reduction effect of sound barrier, while taking into account the sound-absorbing material is added in the structure based on the common.
In the test of the same kind of structure by using different sound barrier sound absorbing materials were tested to obtain data, sound absorption properties of different absorption materials; insertion loss by replacing the top structure to test different, get the curves of different structure influence on insertion loss.
And the measured data and the front of the theoretical calculation results are compared, validate the theoretical results.
Time-domain Numerical of Noise Reduction by Diffraction and Finite Impedance of Barriers.
Skirts and Barriers for Reduction of Wayside Noise From Railway Vehicles-an Experimental Investigation with Application to the BR185 Locomotive.
In the test of the same kind of structure by using different sound barrier sound absorbing materials were tested to obtain data, sound absorption properties of different absorption materials; insertion loss by replacing the top structure to test different, get the curves of different structure influence on insertion loss.
And the measured data and the front of the theoretical calculation results are compared, validate the theoretical results.
Time-domain Numerical of Noise Reduction by Diffraction and Finite Impedance of Barriers.
Skirts and Barriers for Reduction of Wayside Noise From Railway Vehicles-an Experimental Investigation with Application to the BR185 Locomotive.
Online since: August 2013
Authors: Aminuddin Saat, Ali Abuelnuor Abdeen Abuelnuor, Seyed Ehsan Hosseini, Mohsin M. Sies, Ahmed G. Dairobi, Mazlan Abdul Wahid, M. Kabashi Elbasheer, H.A. Mohammed, A.N. Darus
However, its potential needs to be validated using experimental data, especially when new combustion regimes are investigated, as in the case of flameless combustion.
In addition, Mancini et al. have performed the steady state numerical simulations operated in flameless combustion mode and compared with experimental data.
Conclusion Flameless combustion offers a practical solution for the reduction of pollutant emission such as NOX.
In this work, a short review of the numerical work in flameless combustion was summarized and the reduction of NOX emissions were discussed.
Studies showed that most of the numerical results are in agreement with experimental results in term of reduction of NOX emission.
In addition, Mancini et al. have performed the steady state numerical simulations operated in flameless combustion mode and compared with experimental data.
Conclusion Flameless combustion offers a practical solution for the reduction of pollutant emission such as NOX.
In this work, a short review of the numerical work in flameless combustion was summarized and the reduction of NOX emissions were discussed.
Studies showed that most of the numerical results are in agreement with experimental results in term of reduction of NOX emission.
Online since: June 2017
Authors: In Hwan Yeo, Jae Hong An, Ki Ho In, Ki Soo Jeon
Of them, 500°C isotherm method has been applied, relatively easy applicable and the simple method being able to use data by a test.
The estimate on the strength reduction ratio and loading ratio of the doubly reinforced concrete beam exposed to a high temperature has been limited only to the general strength concrete.
For a result of the fire resistance test for 180 minutes, the effective cross section area and effective cross sectional area ratio have been also listed up as per 500°C Isotherm method based on measured temperature data as shown in Table 3.
For the fire resistance performance, maximum 38% strength reduction factor has been also confirmed as per the effective sectional area
In other words, the strength reduction factor of reinforcement has an impact on flexural capacity of beams and also the section is correlated to an variation of the reinforcement temperature.
The estimate on the strength reduction ratio and loading ratio of the doubly reinforced concrete beam exposed to a high temperature has been limited only to the general strength concrete.
For a result of the fire resistance test for 180 minutes, the effective cross section area and effective cross sectional area ratio have been also listed up as per 500°C Isotherm method based on measured temperature data as shown in Table 3.
For the fire resistance performance, maximum 38% strength reduction factor has been also confirmed as per the effective sectional area
In other words, the strength reduction factor of reinforcement has an impact on flexural capacity of beams and also the section is correlated to an variation of the reinforcement temperature.
Online since: October 2013
Authors: Vladimir V. Voronkov, Robert Falster
Numerous experimental data on LID phenomena have been collected, but often these data seem to be controversial.
Most reported data refer to a relatively low injection level, normally n/p0 = 0.1.
More data on LID dependence on p0 and [B] Fig.2 Re-plotted data on the saturated effective concentration Rsat of SRC in Si samples co-doped with B, P and Ga (after ref. [13]).
Recently an extended data set on LID in various materials co-doped with B, Ga and P was presented [13].
We now re-plot these data using the reported Rsat values [13] normalized by [B] [O]2 combination.
Most reported data refer to a relatively low injection level, normally n/p0 = 0.1.
More data on LID dependence on p0 and [B] Fig.2 Re-plotted data on the saturated effective concentration Rsat of SRC in Si samples co-doped with B, P and Ga (after ref. [13]).
Recently an extended data set on LID in various materials co-doped with B, Ga and P was presented [13].
We now re-plot these data using the reported Rsat values [13] normalized by [B] [O]2 combination.
Online since: March 2017
Authors: Muhammad Farooq, Anita Ramli
Hydrogen Temperature-Programmed Reduction Analysis.
The low temperature reduction peak at 548 oC is attributed to the reduction of highly dispersed Mo species (Mo6+ to Mo4+) [8, 9].
The first reduction peak in the TPR profile of each catalyst was due to the reduction of highly dispersed Mo6+ species into the Mo species of lower oxidation states.
The reduction peak at higher temperature is attributed to the reduction of Mo species formed in the first reduction step such as Mo4+→Mo and Mo species strongly bonded to the support along with the partial reduction of the support species [6, 13].
The TPR data shows that the reduction temperature peak maxima increases with increasing the CeO2 loading into the γ-Al2O3 support, indicating strong metal-support interaction as compared to the Mo/γ-Al2O3 catalyst.
The low temperature reduction peak at 548 oC is attributed to the reduction of highly dispersed Mo species (Mo6+ to Mo4+) [8, 9].
The first reduction peak in the TPR profile of each catalyst was due to the reduction of highly dispersed Mo6+ species into the Mo species of lower oxidation states.
The reduction peak at higher temperature is attributed to the reduction of Mo species formed in the first reduction step such as Mo4+→Mo and Mo species strongly bonded to the support along with the partial reduction of the support species [6, 13].
The TPR data shows that the reduction temperature peak maxima increases with increasing the CeO2 loading into the γ-Al2O3 support, indicating strong metal-support interaction as compared to the Mo/γ-Al2O3 catalyst.
Online since: October 2025
Authors: Salasi Wasis Widyanto, Husna Ardian, Sasongko Pramonohadi, Wahyu Wilopo
Data Collection
Data on electricity consumption (Category R-2/TR, 3,500-5,500 VA, with a rate of Rp 1,699.53 per kWh), solar energy generation, and meteorological conditions were collected over 7 months.
Data on electricity expenses before and after PV system installation was gathered for comparative analysis.
The output data is then utilized to compute two critical performance indicators: the Performance Ratio (PR) and Capacity Utilization Factor (CUF).
Data on electricity consumption was gathered for a comparative analysis.
Additionally, thanks are given to the PVGIS web application for offering the resources needed to perform input data simulations.
Data on electricity expenses before and after PV system installation was gathered for comparative analysis.
The output data is then utilized to compute two critical performance indicators: the Performance Ratio (PR) and Capacity Utilization Factor (CUF).
Data on electricity consumption was gathered for a comparative analysis.
Additionally, thanks are given to the PVGIS web application for offering the resources needed to perform input data simulations.
Online since: May 2012
Authors: Man Li Ou, Wei Jun Cao, Long Min Jiang
The measured data of the coupling reflection of the concrete specimens cube compressive strength and the coupling of temperature and standing time are shown in (Table 1) and (Table 2).
Table 1 Cube compressive strength under natural cooling condition fcuTR(MPa) Standing time 100˚C 300˚C 500˚C 600˚C 700˚C 800˚C One day 23.975 (0.685) 23.555 (0.673) 20.440 (0.584) 16.975 (0.485) 12.425 (0.355) 11.130 (0.318) Three days 20.825 (0.595) 19.530 (0.558) 17.675 (0.502) 9.730 (0.278) 4.725 (0.135) 4.025 (0.115) (Data in the brackets indicate the compressive strength reduction factor fcuTR/fcu ) Table 2 Cube compressive strength of the state under water cooling fcuTR(MPa) Standing time 100˚C 300˚C 500˚C 600˚C 700˚C 800˚C One day 21.42 (0.612) 20.65 (0.590) 19.18 (0.548) 16.03 (0.458) 9.450 (0.270) 7.77 (0.222) Three days 26.425 (0.755) 24.22 (0.692) 21.245 (0.607) 14.455 (0.413) 6.79 (0.194) 5.32 (0.152) (Data in the brackets indicate the compressive strength reduction factor fcuTR/fcu) For the compressive strength of concrete specimens under water cooling condition, when less than 500 ˚C, the compressive strength of one day is lower than that of three
The compressive strength under natural cooling and the compressive strength reduction factor under water cooling see (Figure 6) .
(a) (b) Fig. 6: (a) The compressive strength reduction factor under natural cooling (b) The compressive strength reduction factor under water cooling Water cooling of concrete compressive strength is lower than the natural cooling, mainly because the concrete meets water and is suddenly cooled down under high temperature, which the temperature inside and outside the concrete is uneven, resulting in internal structural damage of concrete, producing a large number of cracks.
Table 1 Cube compressive strength under natural cooling condition fcuTR(MPa) Standing time 100˚C 300˚C 500˚C 600˚C 700˚C 800˚C One day 23.975 (0.685) 23.555 (0.673) 20.440 (0.584) 16.975 (0.485) 12.425 (0.355) 11.130 (0.318) Three days 20.825 (0.595) 19.530 (0.558) 17.675 (0.502) 9.730 (0.278) 4.725 (0.135) 4.025 (0.115) (Data in the brackets indicate the compressive strength reduction factor fcuTR/fcu ) Table 2 Cube compressive strength of the state under water cooling fcuTR(MPa) Standing time 100˚C 300˚C 500˚C 600˚C 700˚C 800˚C One day 21.42 (0.612) 20.65 (0.590) 19.18 (0.548) 16.03 (0.458) 9.450 (0.270) 7.77 (0.222) Three days 26.425 (0.755) 24.22 (0.692) 21.245 (0.607) 14.455 (0.413) 6.79 (0.194) 5.32 (0.152) (Data in the brackets indicate the compressive strength reduction factor fcuTR/fcu) For the compressive strength of concrete specimens under water cooling condition, when less than 500 ˚C, the compressive strength of one day is lower than that of three
The compressive strength under natural cooling and the compressive strength reduction factor under water cooling see (Figure 6) .
(a) (b) Fig. 6: (a) The compressive strength reduction factor under natural cooling (b) The compressive strength reduction factor under water cooling Water cooling of concrete compressive strength is lower than the natural cooling, mainly because the concrete meets water and is suddenly cooled down under high temperature, which the temperature inside and outside the concrete is uneven, resulting in internal structural damage of concrete, producing a large number of cracks.
Online since: May 2011
Authors: Jing Ping Chen, Ke Han
This article will review and discuss some data on the severe plastic deformed materials with nanostructures.
Most of the data fitting to above equation are based on the testing in one direction.
For wires, the yield strength is tested in the wire axis, whereas for the strips or sheets, the data are based in rolling direction.
The most important parts for a drawing block are a swift or capstan to hold the coil of rod ready for drawing, the die which executes the actual reduction and the drawing block which supplies the load and energy for reduction.
A modified die set employing more passes with decreased reduction per pass might solve the problem.
Most of the data fitting to above equation are based on the testing in one direction.
For wires, the yield strength is tested in the wire axis, whereas for the strips or sheets, the data are based in rolling direction.
The most important parts for a drawing block are a swift or capstan to hold the coil of rod ready for drawing, the die which executes the actual reduction and the drawing block which supplies the load and energy for reduction.
A modified die set employing more passes with decreased reduction per pass might solve the problem.
Online since: November 2012
Authors: M. Simpson, I.A. Gorlach
The results showed that the developed model achieved an average error reduction of 40%, for the X and Y axes.
However, due to the limited travel of the Z-Axis and the size of the Renishaw interferometer optics, not all geometric errors were measured, which limited the application of the kinematic model to the error reduction in the X-Y plane.
The numerical data showed that the average position error for the X-axis was reduced from approx. 0.07mm to 0.04mm, and for the Y-axis from 0.133mm to 0.08mm.
The results of the cutting tests, i.e. combined axes movements, showed that the model provided a 40% reduction in the average position errors for the X and Y axes.
However, due to the limited travel of the Z-Axis and the size of the Renishaw interferometer optics, not all geometric errors were measured, which limited the application of the kinematic model to the error reduction in the X-Y plane.
The numerical data showed that the average position error for the X-axis was reduced from approx. 0.07mm to 0.04mm, and for the Y-axis from 0.133mm to 0.08mm.
The results of the cutting tests, i.e. combined axes movements, showed that the model provided a 40% reduction in the average position errors for the X and Y axes.
Online since: March 2012
Authors: Saowaroj Chuayjuljit, Nuttapol Sukkasem
As the nano-SiO2 loadings are 7 and 9 phr, SEM images illustrate smoother surfaces, caused by the reduction in the flexibility of the plasticized PVC nanocomposites.
The data for all compounds are summarized in Table 1.
As nano-SiO2 loadings are 7 and 9 phr, the fractured surfaces of the nanocomposites appear to be less ductile and show smoother surfaces (Figs. 4(d) and (e)), caused by the reduction in flexibility of the plasticized PVC nanocomposites.
As nano-SiO2 loadings are over 5 phr (7 and 9 phr), SEM images show less ductile fractured surfaces, caused by the reduction in the flexibility of the plasticized PVC nanocomposites.
The data for all compounds are summarized in Table 1.
As nano-SiO2 loadings are 7 and 9 phr, the fractured surfaces of the nanocomposites appear to be less ductile and show smoother surfaces (Figs. 4(d) and (e)), caused by the reduction in flexibility of the plasticized PVC nanocomposites.
As nano-SiO2 loadings are over 5 phr (7 and 9 phr), SEM images show less ductile fractured surfaces, caused by the reduction in the flexibility of the plasticized PVC nanocomposites.