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Online since: August 2014
Authors: Guang Quan Chen, Wen Quan Liu, Xing Yong Xu, Qiao Su
ArcGIS software is applied involving in data collection, data management, data analysis and evaluation process expressing.
The primary detrimental effects of Seawater intrusion are reduction in the available freshwater storage volume and contamination of production wells, whereby less than 1% of seawater (250 mg/l chloride) renders freshwater unfit for drinking.
Fig2 Information value accumulated curve Fig3 Hazard evaluation and evaluation test The precision of the model was validated by the monitoring data of the mean concentration of Cl- from 2011.6 to 2011.10,which are acquired from 18 automatic monitoring stations.
According to the standard of seawater intrusion evaluation, the data of the 18 well can be divided into 3 kinds: no intrusion well(Cl- < 250 mg/L), intrusion well(250 mg/L < Cl- < 1000 mg/L) and serious intrusion well> 1000 mg/L).
The primary detrimental effects of Seawater intrusion are reduction in the available freshwater storage volume and contamination of production wells, whereby less than 1% of seawater (250 mg/l chloride) renders freshwater unfit for drinking.
Fig2 Information value accumulated curve Fig3 Hazard evaluation and evaluation test The precision of the model was validated by the monitoring data of the mean concentration of Cl- from 2011.6 to 2011.10,which are acquired from 18 automatic monitoring stations.
According to the standard of seawater intrusion evaluation, the data of the 18 well can be divided into 3 kinds: no intrusion well(Cl- < 250 mg/L), intrusion well(250 mg/L < Cl- < 1000 mg/L) and serious intrusion well> 1000 mg/L).
Online since: October 2014
Authors: Kai Zheng, Wei Ben Yang, Yu Hua Han, Hong Yi Li
The data of scanning electron microscope spectrogram (SEM) showed that coating was made from 16 percents Ni and 84 percents Zn.
The anti-corrosion performance of the coating was also studied by analyzing electrochemical impedance spectroscopy (EIS) data.
Moreover, the corrosion performance of coating in anaerobic environment was studied by investigating the data from polarization curve and EIS curve.
The data of the charge transfer resistance, Rct, and the capacity of the double layer (Cdl) were calculated using both the Nyquist and Bode plots of the impedance spectrum.
The equivalent circuit model used in the fitting of impedance data of (a) semicircle with Warburg tail and (b) semicircle without Warburg tail was showed in Fig.5.
The anti-corrosion performance of the coating was also studied by analyzing electrochemical impedance spectroscopy (EIS) data.
Moreover, the corrosion performance of coating in anaerobic environment was studied by investigating the data from polarization curve and EIS curve.
The data of the charge transfer resistance, Rct, and the capacity of the double layer (Cdl) were calculated using both the Nyquist and Bode plots of the impedance spectrum.
The equivalent circuit model used in the fitting of impedance data of (a) semicircle with Warburg tail and (b) semicircle without Warburg tail was showed in Fig.5.
Online since: September 2013
Authors: Albert Albers, Alexander Schwarz, Matthias Behrendt, Rolf Hettel
Besides the conventional modeling methods, also models, which are parameterized with the help of test data, can be used.
The following alternatives can be used to obtain the necessary test data: · testdata from other measurements In the ideal case, data from other tests are available, which can be used for the identification
These test data can be used to identify the model and then re-sort the remaining maneuver
· identification maneuver Alternatively to the first two possibilities, test data for modeling can be identified, too.
Model structure Verification To verify the model, the test data is simulated with identificated model.
The following alternatives can be used to obtain the necessary test data: · testdata from other measurements In the ideal case, data from other tests are available, which can be used for the identification
These test data can be used to identify the model and then re-sort the remaining maneuver
· identification maneuver Alternatively to the first two possibilities, test data for modeling can be identified, too.
Model structure Verification To verify the model, the test data is simulated with identificated model.
Online since: February 2011
Authors: Lei Tan, Xi Jun Liu, Ming Qiao Zhu
Guo [30] conducted tests on shear strength of two types of CFRP-concrete imposed to 120 wet-dry cycles, in which the structures experienced the reduction by 25% and 48% in shear strength, respectively.
Shear strength had a more significant reduction after 100 freeze-thaw cycles.
Subjected to the corrosion of acid and alkali, properties of concrete, resin and fiber may be degraded, thus leading to the reduction of structural strength.
Structure.In designing reinforced structures, on the one hand, reasonable reduction factors of mechanical properties should be proposed on the basis of extensive accelerated tests, on the other hand, taking into comprehensive consideration for designing, in which characteristics of deformation or failure of structures due to deterioration and failure of materials should be fully aware of, besides strengthening the expected weaken parts.
Standards of testing durability of FRP reinforced structures need to be established based on the advanced testing methods so as to offer reliable experimental data for numerical simulation.
Shear strength had a more significant reduction after 100 freeze-thaw cycles.
Subjected to the corrosion of acid and alkali, properties of concrete, resin and fiber may be degraded, thus leading to the reduction of structural strength.
Structure.In designing reinforced structures, on the one hand, reasonable reduction factors of mechanical properties should be proposed on the basis of extensive accelerated tests, on the other hand, taking into comprehensive consideration for designing, in which characteristics of deformation or failure of structures due to deterioration and failure of materials should be fully aware of, besides strengthening the expected weaken parts.
Standards of testing durability of FRP reinforced structures need to be established based on the advanced testing methods so as to offer reliable experimental data for numerical simulation.
Online since: April 2014
Authors: Yi Hui Guo, Ming Tu Ma, Yi Sheng Zhang, Dian Wu Zhou, Lei Feng Song
Introduction
Along with increasingly severe issues on energy and environment, energy conservation and emission reduction facing the automotive industry has become the vital development tendency.
Automobile lightweight, as one of important means in energy conservation and emission reduction, has been valued by an increasing number of researchers [1].
Thermal-mechanical analysis is adopted with requirement of inputting the material stress-strain curve at different temperature, Fig.2 shows the stress versus strain data as a function of temperature for 22MnB5 steel at a strain of 0.1 s-1.The main Thermal-mechanical material properties used for this model are presented in Table 1.
Fig.3 shows the computed results, the results show the thinning distribution of the component in Fig.3 (a).The reduction of thickness of the component in most positions is between 1.7% and 10 %, the reduction of the thickness in the both end of the slot can reach up to 20 %.
Automobile lightweight, as one of important means in energy conservation and emission reduction, has been valued by an increasing number of researchers [1].
Thermal-mechanical analysis is adopted with requirement of inputting the material stress-strain curve at different temperature, Fig.2 shows the stress versus strain data as a function of temperature for 22MnB5 steel at a strain of 0.1 s-1.The main Thermal-mechanical material properties used for this model are presented in Table 1.
Fig.3 shows the computed results, the results show the thinning distribution of the component in Fig.3 (a).The reduction of thickness of the component in most positions is between 1.7% and 10 %, the reduction of the thickness in the both end of the slot can reach up to 20 %.
Online since: May 2014
Authors: E.A. Aguilar-Reyes, C.A. León-Patiño, D. Ramírez-Vinasco
A similar behavior was found by Hafizpour et al. [6] who report a reduction in the relative density of Al/SiC composites from 0.96 to 0.80 with the increase of SiC from 0 to 30%; concentration of hard particles made necessary high compaction pressures to deform the soft metal particles.
Similarly, Gan and Gu [2] showed a reduction in the green density of Cu/SiC compacts from 93% to 83% due to hardening of the matrix and morphological changes of the aggregates formed that affect the packing characteristics after mechanical milling.
It was found that by adding higher volumes of SiC, the milled powders became more irregular in shape, with a simultaneous reduction in size.
After 2h milling, a reduction in particle size was observed (D50=10.0 μm).
A good linear correlation coefficient was obtained when densification and pressure data are fitted by these models.
Similarly, Gan and Gu [2] showed a reduction in the green density of Cu/SiC compacts from 93% to 83% due to hardening of the matrix and morphological changes of the aggregates formed that affect the packing characteristics after mechanical milling.
It was found that by adding higher volumes of SiC, the milled powders became more irregular in shape, with a simultaneous reduction in size.
After 2h milling, a reduction in particle size was observed (D50=10.0 μm).
A good linear correlation coefficient was obtained when densification and pressure data are fitted by these models.
Online since: October 2015
Authors: Horst Meier, Tobias Husmann, Simon Husmann
In the oppositely arranged axial rolling gap, the upper axial roll moves towards the stationary lower axial roll, which causes a reduction of the ring’s height.
By the reduction of the wall thickness and the height of the ring the material flows primarily tangentially in the circumferential direction, which results in an increase of the diameter.
When the ring passes this rolling gap and experiences a high axial reduction an effect of lateral expansion occurs, the so-called beads [10].
Although ring rolling is a forming process and therefore without any loss of material, the manufacturing steps before the ring rolling process, e.g. the piercing and the removal of oxide scale after the heating, lead to a reduction of the billets’ volume.
The combination of both data gained will allow for a prediction of the ring’s geometry in cold state.
By the reduction of the wall thickness and the height of the ring the material flows primarily tangentially in the circumferential direction, which results in an increase of the diameter.
When the ring passes this rolling gap and experiences a high axial reduction an effect of lateral expansion occurs, the so-called beads [10].
Although ring rolling is a forming process and therefore without any loss of material, the manufacturing steps before the ring rolling process, e.g. the piercing and the removal of oxide scale after the heating, lead to a reduction of the billets’ volume.
The combination of both data gained will allow for a prediction of the ring’s geometry in cold state.
Online since: August 2016
Authors: Koichi Nakamura, Mohamed Kamal Gouda, Mohamed Abdel Hady Gepreel
Existed phases were determined by X-ray diffraction using a diffractometer (XRD-6100, Shimadzu, Japan) operating at 30 kV and 30 mA in a 2θ range of 29–80 degree, and recording data at 0.2 degrees with steps at a speed of 1.0 degrees/min.
The cold workability of the alloys in this study was investigated through applying cold rolling with reduction rate of 0.5% at roller speed equal to 25 rpm with keeping the rolling direction constant and without intermediate annealing.
The cold workability of the alloys are measured as a function of the maximum reduction in thickness by cold rolling before the appearance of major crack that leads to failure.
The results showed that the Ti-8Mn alloy with low Mn-content has limited cold workability as the percentage of cold rolling thickness reduction is less than 15% before that appearance of major cracks.
However, further increasing in Mn-content, at 18% Mn-content, the workability decreases drastically to reach less than 8% reduction ratio and no cold workability at 20% Mn-content.
The cold workability of the alloys in this study was investigated through applying cold rolling with reduction rate of 0.5% at roller speed equal to 25 rpm with keeping the rolling direction constant and without intermediate annealing.
The cold workability of the alloys are measured as a function of the maximum reduction in thickness by cold rolling before the appearance of major crack that leads to failure.
The results showed that the Ti-8Mn alloy with low Mn-content has limited cold workability as the percentage of cold rolling thickness reduction is less than 15% before that appearance of major cracks.
However, further increasing in Mn-content, at 18% Mn-content, the workability decreases drastically to reach less than 8% reduction ratio and no cold workability at 20% Mn-content.
Online since: September 2013
Authors: Shao Rong Wang, Hong Zhao, Fen Zhou, Zeng Sheng Chen, Xiang Lei, Yan Li
Input the raw data of the power distribution network, and access to the distribution network node and branch information.
Comparison of the optimal solutions of different methods Optimum location Optimum Capacitor size(kvar) Active Power loss(kW) Reduction in loss(%) Without Cap With Cap This paper 29 1000 202.68 135.84 32.98 10 510 Literature [2] 29 1020 202.68 137.80 32.01 24 310 12 400 The results obtained for the optimal placement of Capacitor has been compared with the results of reference [2].In ref [2] modified particle swarm optimization algorithm has been used to obtain the results.
Use the algorithm in this paper to identify the compensation point nodes 29 and 10, algorithm in ref [2] to identify the compensation point nodes 29, 24and12.The reduction in active power loss with capacitor is 32.98% for test system used in this paper is better than that in ref [2].
The node voltage Figure before and after compensation of IEEE33 node test system Conclusion A methodology is presented in this paper to optimally locate and size capacitor simultaneously for power loss reduction.
[11] Mesut E B,Wu Felix F.Network reconfiguration in distributionsystems for loss reduction and load balancing[J].IEEE Trans onPower Delivery,1989,4(2):1401-1407
Comparison of the optimal solutions of different methods Optimum location Optimum Capacitor size(kvar) Active Power loss(kW) Reduction in loss(%) Without Cap With Cap This paper 29 1000 202.68 135.84 32.98 10 510 Literature [2] 29 1020 202.68 137.80 32.01 24 310 12 400 The results obtained for the optimal placement of Capacitor has been compared with the results of reference [2].In ref [2] modified particle swarm optimization algorithm has been used to obtain the results.
Use the algorithm in this paper to identify the compensation point nodes 29 and 10, algorithm in ref [2] to identify the compensation point nodes 29, 24and12.The reduction in active power loss with capacitor is 32.98% for test system used in this paper is better than that in ref [2].
The node voltage Figure before and after compensation of IEEE33 node test system Conclusion A methodology is presented in this paper to optimally locate and size capacitor simultaneously for power loss reduction.
[11] Mesut E B,Wu Felix F.Network reconfiguration in distributionsystems for loss reduction and load balancing[J].IEEE Trans onPower Delivery,1989,4(2):1401-1407
Online since: December 2014
Authors: Qi Bao Wang, Kai Jun Wang, Feng Min Chang
With the adsorption of sludge-based char, the increase of SCOD concentration on sludge-based surface, mass transfer power reduction, the rate of SCOD adsorption slows down, desorption rate increases.
From the test data can be seen, the average removal rate of TN increased about 10% (form 40.6% to 50.3%) after added the sludge-based char.
The application of sewage sludge-based char for fuel About half of the carbon in dried sludge was left into solid products namely sludge-based char in sewage sludge pyrolysis process, and dried sludge reduction rate is more than 50%, so the calorific value of sludge-based char and the dried sludge is basically the same [10].
The O element is the energy consumption, therefore, although the H element content reduction, the O element content also reduction, the C element content is basically the same, so the heating value of sludge-based char should be same as the dried sludge.
From the test data can be seen, the average removal rate of TN increased about 10% (form 40.6% to 50.3%) after added the sludge-based char.
The application of sewage sludge-based char for fuel About half of the carbon in dried sludge was left into solid products namely sludge-based char in sewage sludge pyrolysis process, and dried sludge reduction rate is more than 50%, so the calorific value of sludge-based char and the dried sludge is basically the same [10].
The O element is the energy consumption, therefore, although the H element content reduction, the O element content also reduction, the C element content is basically the same, so the heating value of sludge-based char should be same as the dried sludge.