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Online since: December 2009
Authors: N.J. Al-Thani, Mariam Al-Ma'adeed
Adding PVA to the matrix of PEO lowered its thermal stability for main decomposition temperatures,
suggesting that PVA makes the blend less stable and more subjected to thermal degradation due to the
fact that PVA has lower molecular weight and even though there is an increase in the hydrogen
bonding the degradation increases which indicates that these bonding are the same for the main and
branched chains (same values of reduction in both temperatures).
The decreasing of the spherulites size confirms the reduction of the crystallinity in the blend which will be confirmed later by DSC measurements.
Table (3-1) X-ray diffraction data for various blends.
Adding PVA to the matrix of PEO reduces the effect of crosslinking at 5 kGy (PVA has lower molecular weight) as the shift to higher melting point is not noticed and also it leads to reduction in the enthalpy and change the shape of the melting peaks to a broader shape which confirm the tendency toward less crystallinity and at high doses the presence of two peaks is noticed which indicates that ionizing radiation causes the intact complex network to be altered to new fragments.
The decreasing of the spherulites size confirms the reduction of the crystallinity in the blend which will be confirmed later by DSC measurements.
Table (3-1) X-ray diffraction data for various blends.
Adding PVA to the matrix of PEO reduces the effect of crosslinking at 5 kGy (PVA has lower molecular weight) as the shift to higher melting point is not noticed and also it leads to reduction in the enthalpy and change the shape of the melting peaks to a broader shape which confirm the tendency toward less crystallinity and at high doses the presence of two peaks is noticed which indicates that ionizing radiation causes the intact complex network to be altered to new fragments.
Online since: December 2011
Authors: Dong Nyung Lee, Hyun Sik Choi, Heung Nam Han
For the electrical steel, the true rolling reduction in RD was set to be 1.1 in ln(ho/h1) with ho and h1 being the sheet thickness before and after rolling.
The overall thickness reduction was 1.43 in true strain, which is equivalent to 86% in engineering strain.
The reductions in RD and TD are equivalent to true strains of 1.1 [ln(1.5/0.5)] and 0.36 [ln(0.5/0.35)], respectively.
The calculated results are similar to the measured data (Fig. 6c).
The overall thickness reduction was 1.43 in true strain, which is equivalent to 86% in engineering strain.
The reductions in RD and TD are equivalent to true strains of 1.1 [ln(1.5/0.5)] and 0.36 [ln(0.5/0.35)], respectively.
The calculated results are similar to the measured data (Fig. 6c).
Online since: June 2003
Authors: A. Opalińska, Donats Millers, Witold Łojkowski, Larisa Grigorjeva
The average grain size (Φ) of nanocrystals was calculated
from specific surface area data and density of zirconium oxide (5.6 g/cm3), assuming that the
particles are spherical.
The luminescence intensity reduction in the smaller nanocrystals can be due to a larger contribution from the surface states - the electronic excitations at the surface can recombine nonradiatively.
This reduction of luminescence intensity might be due to cross-relaxation [13] at larger Pr concentration.
It is suggested that the luminescence intensity reduction in smaller size ZrO2 nanocrystals is due to the larger probability of electronic excitation decay at the nanocrystal surface.
The luminescence intensity reduction in the smaller nanocrystals can be due to a larger contribution from the surface states - the electronic excitations at the surface can recombine nonradiatively.
This reduction of luminescence intensity might be due to cross-relaxation [13] at larger Pr concentration.
It is suggested that the luminescence intensity reduction in smaller size ZrO2 nanocrystals is due to the larger probability of electronic excitation decay at the nanocrystal surface.
Online since: March 2010
Authors: Hui Guang Guo, Hui Qin Chen, Wen Wu He, Jian Sheng Liu
In this study,
the theoretical models were constructed by regression analysis datum and were implemented into the
finite element code.
In table.1, microstructure evolution models of Mn18Cr18N steel were obtained by regression analysis datum from the hot-compression test.
The multi-fire was employed and the percentage of each reduction is about 20%.
Table 2 Primary parameters in the simulation of 300MW retaining ring The one-fire The two-fire Parameters Value Parameters Value Primary diameter of billet[mm] Height of billet[mm] Diameter of punch[mm] Velocity of punch[mm/s] Friction factor Primary temperature of forging[℃] Primary grain size[μm] Preheating temperature of die[℃] 870 1000 405 10 0.3 1200 359 300 Primary inner diameter [mm] Primary outer diameter [mm] Primary height[mm] Velocity of punch[mm/s] Friction factor Each reduction value[mm] Primary grain size[μm] Rotary angle per pass[°] 400 933 1100 40 0.3 30 250 10 Fig. 6 The principle and simulation map (a) principle (b) simulation of the one-fire forging Fig. 7 The photo after one-fire forging Two-Fire Forging and Simulation.
(2) With the increase of fire time and the reduction, the domain of uniform and fine grains enlarges and the grain size could be fined in the multi-fire forging process
In table.1, microstructure evolution models of Mn18Cr18N steel were obtained by regression analysis datum from the hot-compression test.
The multi-fire was employed and the percentage of each reduction is about 20%.
Table 2 Primary parameters in the simulation of 300MW retaining ring The one-fire The two-fire Parameters Value Parameters Value Primary diameter of billet[mm] Height of billet[mm] Diameter of punch[mm] Velocity of punch[mm/s] Friction factor Primary temperature of forging[℃] Primary grain size[μm] Preheating temperature of die[℃] 870 1000 405 10 0.3 1200 359 300 Primary inner diameter [mm] Primary outer diameter [mm] Primary height[mm] Velocity of punch[mm/s] Friction factor Each reduction value[mm] Primary grain size[μm] Rotary angle per pass[°] 400 933 1100 40 0.3 30 250 10 Fig. 6 The principle and simulation map (a) principle (b) simulation of the one-fire forging Fig. 7 The photo after one-fire forging Two-Fire Forging and Simulation.
(2) With the increase of fire time and the reduction, the domain of uniform and fine grains enlarges and the grain size could be fined in the multi-fire forging process
Online since: July 2015
Authors: Elisabetta Ceretti, Claudio Giardini, Luca Giorleo
.°2: Milling curve for a Ring Rolling process
As it can be observed the diameter expansion is realized by reducing the ring width and height: width reduction is controlled by the Idle roll displacement vs the Driver roll, while the ring height is reduced by the Axial rolls movement.
The software reliability was tested by the authors in a previously work where the simulation results where compared with the experimental data [11].
However, even if a milling curve optimizing the geometric and physical parameters does not exist, it is always suggested to design milling curves by imposing a high slope of the Idle roll speed law because, by the industrial point of view, ring precision is more important than loads reduction.
[7] Giorleo L., Ceretti E., Giardini C., Energy consumption reduction in Ring Rolling processes: A FEM analysis, International Journal of Mechanical Sciences. 74 (2013) 55-64
The software reliability was tested by the authors in a previously work where the simulation results where compared with the experimental data [11].
However, even if a milling curve optimizing the geometric and physical parameters does not exist, it is always suggested to design milling curves by imposing a high slope of the Idle roll speed law because, by the industrial point of view, ring precision is more important than loads reduction.
[7] Giorleo L., Ceretti E., Giardini C., Energy consumption reduction in Ring Rolling processes: A FEM analysis, International Journal of Mechanical Sciences. 74 (2013) 55-64
Online since: March 2015
Authors: Muhammad Shoaib Khalid, Xiang Ning Lin, Jin Wen Sun, Asad Waqar, Merfat Ibrahim Okba, Samir Mohammed Dawoud
In the reference [5] the authors have investigated the reduction in fuel consumption by using diesel generator and batteries in a pv hybrid microgrid using homer software.
For environmental assessment, the pollutants emission reduction and renewable fraction (RF) is investigated.
Renewable Resources The data for solar resource was obtained from the National Aeronautics and Space Administration (NASA) Surface Meteorology and Solar Energy web site [9].
A major contribution of this paper is that the COE is decreased, the fuel consumption of diesel is saved The reduction in the quantity of different air pollutants compared with diesel-only system in rural areas in Egypt.
For environmental assessment, the pollutants emission reduction and renewable fraction (RF) is investigated.
Renewable Resources The data for solar resource was obtained from the National Aeronautics and Space Administration (NASA) Surface Meteorology and Solar Energy web site [9].
A major contribution of this paper is that the COE is decreased, the fuel consumption of diesel is saved The reduction in the quantity of different air pollutants compared with diesel-only system in rural areas in Egypt.
Online since: November 2013
Authors: C.S. Ramesh, M.L. Shreeshail, Harsha R. Gudi, Khan Zulfiqar
A uniform distribution of silicon carbide (SiC) within the matrix alloy and reduction in the size of silicon carbide particles in the hot extruded composite are observed.
This drastic reduction in the silicon carbide particle size can be attributed to the high compressive stresses during hot extrusion.
An average reduction of 30% weight loss is observed for the developed composite when compared with the matrix alloy for all the studied angle of impacts.
Harsha and Deepak Kumar Bhaskar, Solid particle erosion behaviour of ferrous and non-ferrous materials and correlation of erosion data with erosion models, Materials and Design Vol. 29, (2008) 1745–1754
This drastic reduction in the silicon carbide particle size can be attributed to the high compressive stresses during hot extrusion.
An average reduction of 30% weight loss is observed for the developed composite when compared with the matrix alloy for all the studied angle of impacts.
Harsha and Deepak Kumar Bhaskar, Solid particle erosion behaviour of ferrous and non-ferrous materials and correlation of erosion data with erosion models, Materials and Design Vol. 29, (2008) 1745–1754
Online since: February 2013
Authors: Tao Wang, Zhao Li, Yu Xin Zhao, Yong Zhang, Mai Cang Zhang, Shu Hong Fu
Strain and stress data was recorded automatically during compression.
Power dissipation map of alloy GH720Li at 50% reduction Fig. 9.
Flow instability map of alloy GH720Li at 50% reduction Hot processing map of GH720Li ingot is obtained at a strain of 50% by overlaying the flow instability area on the power dissipation map (Fig 10).
Hot processing map of alloy GH720Li at 50% reduction On the other hand, it is seen from Fig 10 that the processing map exhibits three instable areas.
Power dissipation map of alloy GH720Li at 50% reduction Fig. 9.
Flow instability map of alloy GH720Li at 50% reduction Hot processing map of GH720Li ingot is obtained at a strain of 50% by overlaying the flow instability area on the power dissipation map (Fig 10).
Hot processing map of alloy GH720Li at 50% reduction On the other hand, it is seen from Fig 10 that the processing map exhibits three instable areas.
Online since: December 2016
Authors: Tālis Juhna, Viktorija Denisova, Linda Mezule, Jurijs Ozolins
Log reduction was calculated using the following equation (Eq. 1):
Log reduction = log (N/N0)
At the beginning of electrolysis, the pH values increased till 8.7 ± 0.1 and slowly decreased after 8 minutes of electrochemical disinfection (data not shown).
During the first 5 minutes of electrochemical disinfection a mere 0.24-log reduction of E. coli was observed (Fig. 2).
At the beginning of electrolysis, the pH values increased till 8.7 ± 0.1 and slowly decreased after 8 minutes of electrochemical disinfection (data not shown).
During the first 5 minutes of electrochemical disinfection a mere 0.24-log reduction of E. coli was observed (Fig. 2).
Online since: April 2021
Authors: Marion Merklein, Fabian Knieps, Manuel Köhl
Cost reduction and sustainability aspects lead this trend.
To calibrate this model, yield strength in three directions are needed as well as Lankford coefficients and biaxial input data.
The first method to correct stress strain data in the necking zone was proposed by Zhang et al. [8] for rectangular specimens but only up to a certain aspect ratio.
To consider the multiaxial stress state in the necking zone, the approach of Paul et al. was applied to the data measured in the above described two rows of facets.
While the standard procedure to evaluate the tensile test over the complete measuring length until tensile strength only reaches elongation up to about 0.1 plastic strain (A20 in Figure 3 (a)), the local measurement is able to provide flow curve data up to 0.4 (DIC local in Figure 3 (a)).
To calibrate this model, yield strength in three directions are needed as well as Lankford coefficients and biaxial input data.
The first method to correct stress strain data in the necking zone was proposed by Zhang et al. [8] for rectangular specimens but only up to a certain aspect ratio.
To consider the multiaxial stress state in the necking zone, the approach of Paul et al. was applied to the data measured in the above described two rows of facets.
While the standard procedure to evaluate the tensile test over the complete measuring length until tensile strength only reaches elongation up to about 0.1 plastic strain (A20 in Figure 3 (a)), the local measurement is able to provide flow curve data up to 0.4 (DIC local in Figure 3 (a)).