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Online since: March 2004
Authors: Yun Soo Lim, Dong Bok Lee, Young Jae Lee, Jang Soon Kim, Jae Chun Lee, Yun Jung Chung, Jae Hyung Kim
The experimental data showed variations in specific surface area, microstructure by the activated carbon fibers.
An abrupt reduction of specific surface area was observed in the experiments with the ratio of 3:1 of KOH/stabilized PAN-based fiber, being dissimilar with the result of KOH/fiber ratios of 1:1 and 2:1 in the similar experiments.
The abrupt reduction of specific surface areas in the ratio of 3:1 in KOH/stabilized PAN-based fiber was different from the ratios of 1:1 and 2:1.
KOH changed to K2O at 900 � , and subsequently K2O changed to metallic K + ions by reduction process at 900 � .
The abrupt reduction of specific surface areas in the ratio of 3:1 in KOH/stabilized PAN-based fiber was different from the ratios of 1:1 and 2:1.
Online since: May 2006
Authors: Ana M. R. C. Sousa, António Maurício C. Fonseca, Gilbert Kirsch, M. Manuela M. Raposo
In agreement with the solvatochromic data and also with the electrochemical study the new donor-acceptor systems synthesized could have applications in NLO.
The structures of the thienylpyrrole azo dyes 1-2 were unambiguously confirmed by their analytical and spectral data.
For example, azopyrrole 1a display a second reduction at 2E1/2 = -1.70 V and azopyrrole 1d display a reduction at 2E1/2 = -1.83 V.
These data are in line with the conclusion of the UV-visible study, which showed a lowering of the HOMO-LUMO gap with the increase of strength of the acceptor group in the arylazo moiety and with the substitution of an alkyl group for an aryl group on the nitrogen of the pyrrole ring.
Table 3- Electrochemical data for thienyl-pyrroles 3 and pyrrole azo dyes 1-2 a.
Online since: September 2005
Authors: Nikolay Y. Zolotorevsky, Yuri Titovets, D.M. Vasiliev
Determination of the unknown stress values, σph and σor, from the best fit of the calculated curve to the experimental data
Measured lattice strains ε vs. sin2 ψ (circles) obtained for {220} and {211} reflections, and theoretical fit (full line) to the experimental data. a - e = 0.25; b - e = 2.
In the Fig. 2 experimental data obtained for the smallest and the largest drawing strains are presented together with the theoretical curves.
Results are presented in Fig. 4 together with the data by Belassel et al. for fine lamellar pearlite having interlamellar spacing 90 nm, that is similar to the mean spacing about 70 nm observed in our case after e = 2 [7].
Unfortunately, our knowledge about internal structure of the lamellae is limited by the data [11,12] mentioned above.
Online since: April 2014
Authors: Ki Pyo You, Young Moon Kim, Jang Youl You, Sun Young Paek
In addition, the experiment found that the wind velocity reduction rate is affected by the installation distance of the wind fence.
The reduction in wind velocity brings micrometeorological changes (wind velocity and wind direction) to the protected area.
The number of measurement data was 1024 each time, and measurements were made three times and the mean value used.
The wind velocity reduction effect was highest (50%) at a porosity of 40%.
Overall, the wind velocity reduction rate was higher where the wind fence was installed than where it was not.
Online since: August 2013
Authors: Jian Chin Lim, Togay Ozbakkloglu
The database consisted of 976 test data having unconfined concrete strength ranging from 6.2 to 169.7MPa.
In addition, these FRP-confined HSC models were developed based on limited experimental test data, which were often obtained only from the tests performed by the originators of the models.
This necessitates the use of a hoop rupture strain reduction factor (kε,f) for calculating the actual confining pressures at ultimate (flu,a) (Eq. 1)
(7) and (8) (9) Comparison of Model Predictions with Test Data The performances of the four existing models that are applicable to FRP-confined HSC (i.e. [2-5]) and the model presented in this paper were compared using the test results of FRP-confined HSC, with unconfined concrete strengths (f’co) greater than 55 MPa.
Statistics on performances of models in predicting ultimate conditions of FRP-confined HSC Model Prediction of f’cc / f’co Prediction of εcu / εco Data AAE (%) M (%) SD (%) Data AAE (%) M (%) SD (%) Miyauchi et al. [2] 166 36.5 135.6 23.0 160 35.1 113.1 45.6 Mandal et al. [3] 166 65.6 164.7 78.5 160 197.1 285.2 295.2 Berthet et al. [5] 166 16.0 111.7 16.2 160 30.9 71.0 20.1 Xiao et al. [4] 166 25.2 123.3 18.7 160 34.7 130.7 38.4 Proposed 166 10.8 97.2 13.0 160 20.2 98.0 27.3 Conclusions This paper has presented the results of an investigation on the axial compressive behavior of FRP-confined HSC.
Online since: May 2012
Authors: Chao Yuan Cheng, Chun Yu Hsiao, Shu Wei Chung, Chun Pin Chiang, Zai Wei Chin
Arc-shaping of magnets for reduction of cogging torque inpermanent-magnet synchronous generators Chao-Yuan Cheng1,a,Chun-Yu Hsiao2,b, Shu-Wei Chung1,c, Chun-Pin Chiang1,d, Zai-Wei Chin1, e 1Department of Electrical Engineering, St.
Ansoft’s Maxwell and RMxprt were employed for data analysis.
When the thickness of the magnets exceeds a given limited, variations in cogging torque reach saturation levels at which point further reduction does not lead to observable improvements.
Thus, a reduction in cogging torque leads to a reduction in motor efficiency.
Shen, “Cogging torque reduction in permanent magnet flux-switching machines by rotor teeth axial pairing,” IET Electric Power Applications, vol. 4, pp. 500-506, 2010
Online since: July 2018
Authors: Elisabeth Zizler, Matthias Wenk, Benedikt Martens
Data collection and data pre-processing.
The measured data is read out from the PLC via OPC UA and archived in a uniform data structure in a database.
Data Acquisition in the PLC Program In order for the pre-processing unit to be able to connect autonomously to the correct data in the PLC data blocks, the control program must meet certain standards.
In these FBs, the standardized data is stored as part of this component in the corresponding instance data module.
The basic structure consists of an ID, time data, status data and energy data.
Online since: October 2014
Authors: Jing Bo Yang, Zheng Qing Chen, Xu Gang Hua
Focusing on a quadruple-circuit on the same steel tube tower, a vibration reduction test on a real-scale tower conducted.
A vibration reduction test is conducted on real-scale tower in the Pole and Tower Testing Base, and the test result shows good damping effect of the TMD.
Double cantilevers pendulous eddy current TMD on debugging frame Vibration Reduction Test and Damping Effect on a Real-scale Tower The vibration signal test system is connected to the data acquisition instrument through 3 acceleration sensors installed in the middle of the tower tip and the cross arm.
During the test, wind speed data for 3 times period are obtained and wind speed curves are plotted based on the data to provide reference for the input of random wind vibration in the corresponding period.
Typical Actual Measured Time-history Wind For environmental vibration and free attenuation response signals after unloading, a variety of data processing methods are used to identify the modal damping of transmission tower before and after the installation of the damping devices.
Online since: June 2014
Authors: Zaki Suud, Hiroshi Sekimoto, Maryam Afifah, Indah Rosidah, A. Ferhat
At the beginning we assume the power density level in each region and then we perform the burn-up calculation using the assumed data.
The burn-up calculation is performed using cell burn-up in SRAC code which then give eight energy group macroscopic cross section data to be used in two dimensional R-Z geometry multi groups diffusion calculation.
It is shown that reduction of the number of regions from 10 to 8 which directly reduces the discharge burn-up gives reduction of effective multiplication constant especially in the beginning of life.
This reduction of the number of regions with the same other parameters resulted in reduction of burn-up level from about 26,3%HM to 21.2% HM (or 263000 MWd/tohHM to 212000 MWd/ton HM).
The reduction of region from 8 to 6 with the same other parameters resulted in reduction of burn-up level from about 26,4%HM to 20.1% HM (or 264000 MWd/tohHM to 201000 MWd/ton HM).
Online since: February 2011
Authors: Jun Lin Tao, Tang Li, Qingyuan Wang
The S-N data shows continuous reduction tendency.
It was found that with the increase of test relative humidity, the fatigue properties of the alloy is decreased, the fatigue limit in 95% RH was nearly 20% reduction of that in 15% RH, only 67% of its yield strength.
Meanwhile, the S-N data is much more scattered than it in lower relative humidity.
Humidity caused the decrease in fatigue strength of the alloy and scattered the S-N data obviously.
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