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Online since: November 2014
Authors: A.M. Abioye, Farid Nasir Ani
The microwave system consists of modified multimode domestic microwave (1 kW, 2500 MHz), fluidized bed glass quartz reactor (5 cm internal dia. x 20 cm height) with wire mesh which serves as screen support as well as distributor plate, N2 and CO2 gases, K-type thermocouple (0 – 1200 oC range) inserted into the bed region and data acquisition system linked to personal computer for continuous monitoring and recording of process temperature.
Reduction in radiation time is expected to bring about considerable reduction in cost of production as well as improvement in the pore structure.
Online since: June 2014
Authors: Andreea Cristina Petcu, Cornel Sandu, Corneliu Berbente
This can be explained by a lower cracking reaction rate of the more complex hydrocarbons contained in the camelina oil, causing a reduction in the CO residence time, and hence a smaller time interval for its further oxydation into CO2.
However, the experiments also show that camelina oil may be used, with certain penalties, as fuel, allowing for a significant reduction in the consumption of pure kerosene, which is more expensive, and also not renewable, or eco-friendly.
A series of tests at different engine speeds is scheduled for the near future, but such data is unavailable at this moment for publishing.
Online since: August 2015
Authors: Poompat Saengudomlert, Puttipong Sornplaeng, Lunchakorn Wuttisittikulkij
Recently, for optical backbone networks, mixed line rate (MLR) networks have been explored to support different rates on different channels on the same fibers to achieve cost efficiency in an optical network, and to exploit the volume discount [3] of 40 Gb/s and 100 Gb/s transponder, in the networks In an optical network [4], the failure of even a single lightpath can lead to huge data loss.
As the traffic grows, the cost reduction of MLR networks in comparison to SLR networks becomes significant.
However, the flexibility offered by the MCR approach for MLR networks, in comparison to the FCR approach, does not provide a significant cost reduction.
Online since: June 2015
Authors: Fan Li, Yogesh K. Sharma, M.R. Jennings, S.M. Thomas, Dean Hamilton, C.A. Fisher, P.A. Mawby, A. Pérez-Tomás
This problem can be overcome by using 3C- polytype. 3C-SiC epilayer can be grown on Si and potentially on 8” Si substrate which will results in a drastic reduction of the cost [5].
These results are consistent with the G-V data, Fig. 3.
Like 4H-SiC nitrided MOS-C, high-temperature N2O annealing of as –oxidized 1300oC 3C-SiC MOS-C leads to further reduction in Dit.
Online since: June 2015
Authors: Dominique Planson, Dominique Tournier, Maxime Berthou
In the future, to optimize static and dynamic characteristics of SiC MOSFETs, its gate oxide quality will be improved by reduction of interfacial trap density, thus saturation current increase due to self-heating will be minimized and short-circuit capability improved.
Reduction of the collector current during the short-circuit had little impact on the SC capability of the BJT.
Tested BJT may require design improvements to show more stable results under SC to provide comparable data.
Online since: March 2016
Authors: Miao Yong Zhu, Xing Liang Gao, Dong Xu, Bing Zheng
According to data processing on this basis, the diffusion coefficient of SCM435 steel increases as temperature increases at 900-1100℃.
Therefore, the reduction of the number of grain boundary results in the reduction of the diffusion coefficient.
Online since: December 2013
Authors: Siti Lydia Rahim, Shajahan Maidin
AM employs additive processes (may be combined with subtractive machining in future) to deliver finished goods from digital data; thereby eliminating all tooling requirement [2].
AM enables a creative design process with the advantage of faster product development time and consequential reduction in tooling cost.
AM offers increasing benefits in production schedules and flexibility for manufacturing operations due to reduction in tooling costs and design requirement [3].
Online since: January 2016
Authors: Marta Harničárová, Dušan Mitaľ, Jozef Zajac, Jan Valíček, Zuzana Hutyrová
The yield point could not be determined correctly, because any conventional values of deformation are not available for the given type of material (data from protocol – is not define standard deformation curve).
Fig. 4 Load digram – tensile test – a) sample 1 and b) sample 2 Fig. 5 Load diagram – tensile test – a) sample 3 and b) sample 4 Table 1 Values of mechanical properties after tensile testing No. of sample Tensile strength [MPa] Engineering strain [%] Reduction [%] Deformation work [mJ] 1 24 2.8 2.0 20.4 2 15 2.9 0.4 12.4 3 24 3.4 0.8 24.1 4 15 5.1 0.4 13.5 5 *defect *Probably because of the occurrence of a defect, the test sample 5 was already broken at 200 N, so the result is not mentioned.
Fig. 9 X-ray picture in the direction of rotation axis (after machining – turning) Basic statistical parameters are shown in table follows (Tab. 3) Table 3 Statistical parameters of calculated mechanical properties Statistical parameter Yield point [MPa] Elongation [%] Reduction [%] Deformation work [mJ] Bending strength [MPa] Arithmetical average 19.50 3.55 0.90 17.6 16.75 Dispersion 27.00 1.14 0.57 31.31 1.76 Standard deviation 5.20 1.07 0.76 5.60 1.33 Median 19.50 3.15 0.60 16.95 16.71 Summary Quality of the resulting machined surface is closely linked to the characteristics of the material (whether mechanical, physical, or technological ones).
Online since: January 2012
Authors: Il Heon Son, Kyung Hoon Lee
The basic concept of the multi-scale technique is to simulate the micro model including the geometry of the micro-size surface defect with an aid of the field data of the macro simulation.
It was not possible to see the overlap phenomenon because the roughing stands only have the reduction ratio (RA) of 60%.
It can be said that initial pinholes can not form the surface defects since the area reduction of the caliber rolling equals to approximately 99.9%.
Online since: August 2023
Authors: Juliana Hj Zaini, Malik Muhammad Nauman, Kamran Ali, Amir A. Abdallah, Maulid Kivambe
This section explains the identified visual defects and also provides relevant data for discussion.
It leads to inconsistency of the cells equivalent to partial shadowing effects which ultimately give rise to δPm reduction in the power output.
Due to the constant nature of this effect it is believed that the module cell active under elevated temperatures will finally encounter slow physical degradation which then results into a permanent reduction of power output [6].
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