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Online since: August 2013
Authors: Xiao Yan Song, Qiang Hua Ji, Yuan Yuan Li
Introduction
Energy conservation, emission reduction, environmental protection and sustainable development are hot issues of common concern of all countries in the world.
As seen from the data in Table 2, there are no changes in PG grade before and after adding warm-mix agent to SBS modified asphalt, so that warm-mix agent has little influence on PG grade.
Table 5 Rutting test data of SBS modified asphalt mixture Mixture type Average dynamic stability (time/mm) AC-13 SBS modified asphalt HMA 4183 WMA 5006 As seen from Table 5, the dynamic stability of the warm-mix SBS modified asphalt mixture is higher than that of the ordinary hot-mix SBS modified asphalt mixture
Table 6 Data of beam bending failure test of SBS modified asphalt mixture Mixture type Anti-flexural-tensile strength (MPa) Flexural-tensile strain (με) Flexural-tensile stiffness modulus (MPa) AC-13 SBS modified asphalt HMA 8.6 2524 3407 WMA 10.3 2544 4048 As seen from Table 6, the destruction flexural-tensile strain of the warm-mix SBS modified asphalt mixture is equivalent to the corresponding hot-mix asphalt mixture.
Table 7 Data of water stability test of SBS modified asphalt mixture Mixture type Residual stability ratio (%) Residual strength ratio (%) AC-13 SBS modified asphalt HMA 92.5 93.2 WMA 93.3 95.6 The analysis of the data in above table shows: the residual stability ratio and freeze-thaw splitting strength ratio of the warm-mix SBS modified asphalt mixture can meet the specification requirements.
As seen from the data in Table 2, there are no changes in PG grade before and after adding warm-mix agent to SBS modified asphalt, so that warm-mix agent has little influence on PG grade.
Table 5 Rutting test data of SBS modified asphalt mixture Mixture type Average dynamic stability (time/mm) AC-13 SBS modified asphalt HMA 4183 WMA 5006 As seen from Table 5, the dynamic stability of the warm-mix SBS modified asphalt mixture is higher than that of the ordinary hot-mix SBS modified asphalt mixture
Table 6 Data of beam bending failure test of SBS modified asphalt mixture Mixture type Anti-flexural-tensile strength (MPa) Flexural-tensile strain (με) Flexural-tensile stiffness modulus (MPa) AC-13 SBS modified asphalt HMA 8.6 2524 3407 WMA 10.3 2544 4048 As seen from Table 6, the destruction flexural-tensile strain of the warm-mix SBS modified asphalt mixture is equivalent to the corresponding hot-mix asphalt mixture.
Table 7 Data of water stability test of SBS modified asphalt mixture Mixture type Residual stability ratio (%) Residual strength ratio (%) AC-13 SBS modified asphalt HMA 92.5 93.2 WMA 93.3 95.6 The analysis of the data in above table shows: the residual stability ratio and freeze-thaw splitting strength ratio of the warm-mix SBS modified asphalt mixture can meet the specification requirements.
Online since: July 2015
Authors: Guang Jian Zheng, Shu Juan Yu, Jin Ying Pang, Dong Huang, Wan Li Lu, Guo Wei Mo
The data show that the Al2O3-2SiO2 powders with the high alkali-activation reactivity are of high content of 5-coordinated Al and the peaks attributed to 5-coordinated Al are strengthened with the rise of calcination temperature of the powders.
Therefore, the reduction of water quantity favors the reduction of the gelation time.
These data show that there is no strength developed in the product calcined at 200 ℃ and below.
As shown from all above data, calcination temperature has the biggest effects on the alkali-activation reactivity of the powders, compared to other preparation conditions.
These data in Fig. 1 is in agreement with the view suggested by Rocha and Klinwowski.
Therefore, the reduction of water quantity favors the reduction of the gelation time.
These data show that there is no strength developed in the product calcined at 200 ℃ and below.
As shown from all above data, calcination temperature has the biggest effects on the alkali-activation reactivity of the powders, compared to other preparation conditions.
These data in Fig. 1 is in agreement with the view suggested by Rocha and Klinwowski.
Online since: December 2013
Authors: Suzairin Md Seri, Mohd Faizal Mohideen Batcha, Zainal Ambri Abdul Karim, Vijay R. Raghavan
The numerical work consisted of 2-dimensional unsteady numerical simulation which was validated against the experimental data.
Good agreement between these sets of data can be seen for all four rows.
Comparison of local pressure coefficient distribution between experimental and numerical data for plain tube at Re = 15950.
Experimental work has been done to obtain pressure coefficient data in order to validate the numerical work.
Validated numerical data has been obtained by using transition k-kl-omega model.
Good agreement between these sets of data can be seen for all four rows.
Comparison of local pressure coefficient distribution between experimental and numerical data for plain tube at Re = 15950.
Experimental work has been done to obtain pressure coefficient data in order to validate the numerical work.
Validated numerical data has been obtained by using transition k-kl-omega model.
Online since: September 2019
Authors: Tung Sheng Yang, Fu Nong Hsu
Finally, the forging force and product shape are compared between the experimental data and the simulation results.
Because of friction anisotropy, the factors could not be determined directly with flat ground platens because the data was beyond the range of calibration curves.
The reduction ratios of height and inner diameter are calculated.
Flow stress curve is the input data of forging process simulation.
The load predicted by finite element simulation is close to the experimental data of initial billet temperature of 200 ℃and 300℃ .
Because of friction anisotropy, the factors could not be determined directly with flat ground platens because the data was beyond the range of calibration curves.
The reduction ratios of height and inner diameter are calculated.
Flow stress curve is the input data of forging process simulation.
The load predicted by finite element simulation is close to the experimental data of initial billet temperature of 200 ℃and 300℃ .
Online since: April 2010
Authors: Magda Pereira Pinto, Vera M. Lessa Catalão
Table 2 shows the electric energy waste reduction achieved by students after having been trained by
Procel, highlighting the participation of 10 Brazilian Universities/Institutes.
These data envisage the energy saved and the role of education both in domestic and formal basis.
Load Factor 11,271,382 0,6 TToottaall 993399,,663355,,880033 22..885533 What one can notice, starting from the presented data, is that there is efficiency in the programs developed by the Brazilian Government; once their proposals, above all, warn the society about the value and economical feasibility of the actions taken to combat energy wasting and to enhance the energetic efficiency of equipments, processes and end use of the energy.
In that sense, the following results are highlighted: in April, 2008, the Aneel (Brazilian Electric Energy National Agency) approved 279 programs presented by 61 distribution companies, involving investments up to R$ 261 million, which allowed the yearly reduction of 369 GWh. hence, the total consumption reduction achieved with those programs since 1998 was 5,597 GWh per year.
The EE can promote the transformation of behavior and attitudes addressed to consume reduction and the environmental impacts of our civilization.
These data envisage the energy saved and the role of education both in domestic and formal basis.
Load Factor 11,271,382 0,6 TToottaall 993399,,663355,,880033 22..885533 What one can notice, starting from the presented data, is that there is efficiency in the programs developed by the Brazilian Government; once their proposals, above all, warn the society about the value and economical feasibility of the actions taken to combat energy wasting and to enhance the energetic efficiency of equipments, processes and end use of the energy.
In that sense, the following results are highlighted: in April, 2008, the Aneel (Brazilian Electric Energy National Agency) approved 279 programs presented by 61 distribution companies, involving investments up to R$ 261 million, which allowed the yearly reduction of 369 GWh. hence, the total consumption reduction achieved with those programs since 1998 was 5,597 GWh per year.
The EE can promote the transformation of behavior and attitudes addressed to consume reduction and the environmental impacts of our civilization.
Online since: March 2011
Authors: Mathias Liewald, Eugen Oswald, Oliver Stephan
Regarding on lightweight construction, a reduction of weight in conjunction with high component stiffness is required.
Compared to conventional finite element analysis, beside of information about e.g. material property, applied loads or mounting, further data have to be defined.
Fig. 3 shows significant geometric data of the baseplate with corresponding measures, seats of particular tools and ribbing structures.
Fig. 4 shows a sectional view of the design space mesh including relevant mesh data.
According to the predefined design space, this value corresponds approximately to 15% weight reduction of the standard ribbed baseplate.
Compared to conventional finite element analysis, beside of information about e.g. material property, applied loads or mounting, further data have to be defined.
Fig. 3 shows significant geometric data of the baseplate with corresponding measures, seats of particular tools and ribbing structures.
Fig. 4 shows a sectional view of the design space mesh including relevant mesh data.
According to the predefined design space, this value corresponds approximately to 15% weight reduction of the standard ribbed baseplate.
Online since: August 2021
Authors: Gintaris Kaklauskas, Domas Valiukas, Ronaldas Jakubovskis
As it turns out, the considered model shows a good correlation with experimental data at different loading levels, and the most important factor describing the effectiveness is the geometry of ribs.
In the vicinity of primary cracks, those struts undergo bending due to higher reinforcement deformation, which results in a reduction of transferred forces, thus reduction in bond (this is called bond deterioration zone).
The model in question, is callibrated with the test data obtained by testing three identical RC prisms with lengths of 270mm.
Fig. 1 Experimental data: a) RC prism under tension; b) typical scheme of strain gauges in the specimens; c) composition of steel rebars The specimens were tested 28 days after casting using a hydraulic machine with displacement control (Fig. 1a).
After the comparison of numerical and experimental data, the following conclusions were drawn : 1.
In the vicinity of primary cracks, those struts undergo bending due to higher reinforcement deformation, which results in a reduction of transferred forces, thus reduction in bond (this is called bond deterioration zone).
The model in question, is callibrated with the test data obtained by testing three identical RC prisms with lengths of 270mm.
Fig. 1 Experimental data: a) RC prism under tension; b) typical scheme of strain gauges in the specimens; c) composition of steel rebars The specimens were tested 28 days after casting using a hydraulic machine with displacement control (Fig. 1a).
After the comparison of numerical and experimental data, the following conclusions were drawn : 1.
Online since: June 2013
Authors: Juan San José, Ángela Mangas, Maite Santos, Garbiñe Atxaga, Olatz Adarraga, Jose Ignacio Zarazua
The other input data for simulation are listed next.
The other input data for simulation are listed next.
The other input data for simulation are listed next.
This data is usually related to the oven temperature.
These data are available in next table: Table1.
The other input data for simulation are listed next.
The other input data for simulation are listed next.
This data is usually related to the oven temperature.
These data are available in next table: Table1.
Online since: December 2013
Authors: Andrey V. Benin, S.G. Semenov, Artem S. Semenov
The comparison of obtained FE results with experimental data is presented and discussed for the pulling ribbed bars out of concrete blocks, the spalling of concrete cover at the automobile bridge and cracking of ballastless deck at the railway bridge.
The comparison of obtained numerical results with experimental data has been presented in Fig. 1.
The volume of corrosive material is about 2.0…2.5 times of the reduction of the bar cross-section; respectively, high pressure on the concrete is generated resulting in origination of cracks and their propagation through the concrete cover.
Crack propagation under progressive corrosion. a is the length of horizontal crack The obtained crack opening width d = 44mm on free surface for the reinforcement radius losses of D=40 mm demonstrate a satisfactory agreement with experimental data d ≈ 50mm [5].
However, practical realization of this approach demands considerable computational effort and additional experimental data for mechanical properties of concrete.
The comparison of obtained numerical results with experimental data has been presented in Fig. 1.
The volume of corrosive material is about 2.0…2.5 times of the reduction of the bar cross-section; respectively, high pressure on the concrete is generated resulting in origination of cracks and their propagation through the concrete cover.
Crack propagation under progressive corrosion. a is the length of horizontal crack The obtained crack opening width d = 44mm on free surface for the reinforcement radius losses of D=40 mm demonstrate a satisfactory agreement with experimental data d ≈ 50mm [5].
However, practical realization of this approach demands considerable computational effort and additional experimental data for mechanical properties of concrete.
Online since: January 2013
Authors: Milan Brandt, Aleksandar Subic, Mohammad Babaee, Martin Leary
Additive Manufacture
The ASTM [1] defines Additive Manufacture as the "process of joining materials to make objects from 3D model data, usually layer upon layer, as opposed to subtractive manufacturing methodologies, such as traditional machining.”
Robust (left), Compromised (centre), Failed (right) Based on this experimental data, the minimum build angle fmin, versus orientation angles α1 and α2, data for the polyhedra of interest (Figs. 9-12) can be presented in terms of the associated FDM integrity.
This data will be of interest to researchers and practitioners who will may, under certain circumstance, allow a geometry that includes some surface defects, but is nonetheless self-supporting.
The combination of FDM integrity data and charts of minimum build angle allows the feasibility of for self-supporting geometry to be presented.
This data can be utilised in the design of tessellated geometries with known build orientations
Robust (left), Compromised (centre), Failed (right) Based on this experimental data, the minimum build angle fmin, versus orientation angles α1 and α2, data for the polyhedra of interest (Figs. 9-12) can be presented in terms of the associated FDM integrity.
This data will be of interest to researchers and practitioners who will may, under certain circumstance, allow a geometry that includes some surface defects, but is nonetheless self-supporting.
The combination of FDM integrity data and charts of minimum build angle allows the feasibility of for self-supporting geometry to be presented.
This data can be utilised in the design of tessellated geometries with known build orientations