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Online since: October 2010
Authors: Jo Dweck, André H. Rosa, Leonardo F. Fraceto, V. Campos, Pedro M. Büchler, Leandro Cardoso de Morais
Sludge combustion enjoys a combination of several advantages that are not found in other treatment alternatives, including a large reduction of sludge volume to a small stabilized ash, which accounts for only 10% of the volume of mechanically dewatered sludge, and thermal destruction of toxic organic constituents [4].
In Kissinger model, which was originally developed for DTA curve data concerning to reactions of the type solida à solidb + gas, of any order n, the maximum reaction rate temperature is characterized by the DTA peak temperature, which corresponds to the maximum heat effect of the decomposing reaction.
Thus the DTG peaks occurring between 780 and 920oC are probably due to a reduction reaction (N5) of the residual sulphates by the carbonaceous residue and/or by residual sulphides, with simultaneous release of SO2 [19, 20].
From DTA data, the activation energy of step N1 was 108 kJ/mol.
In Kissinger model, which was originally developed for DTA curve data concerning to reactions of the type solida à solidb + gas, of any order n, the maximum reaction rate temperature is characterized by the DTA peak temperature, which corresponds to the maximum heat effect of the decomposing reaction.
Thus the DTG peaks occurring between 780 and 920oC are probably due to a reduction reaction (N5) of the residual sulphates by the carbonaceous residue and/or by residual sulphides, with simultaneous release of SO2 [19, 20].
From DTA data, the activation energy of step N1 was 108 kJ/mol.
Online since: July 2017
Authors: Shamil Mukhtarov, Vener Valitov, Farid Z. Utyashev, Marsel Nagimov, Artem Ganeev, Ruslan Shakhov
Critical factors that reduce costs and fabricating time by superplastic roll forming are metal utilization factor increase up to 0.8, reduction of the labor cost and metal consumption for tools manufacturing.
A significant reduction in the deformation load is an undoubted advantage of roll forming process over isothermal closed die forging.
Mechanical testing results show in Table 3 a significant increase in tensile strength and toughness in comparison with data of material specification.
Superplastic roll forming provides processing precise complex shape components with uniform structure and strength properties which are 15-20% higher than those of material specification data after conventional heat treatment. 2.
A significant reduction in the deformation load is an undoubted advantage of roll forming process over isothermal closed die forging.
Mechanical testing results show in Table 3 a significant increase in tensile strength and toughness in comparison with data of material specification.
Superplastic roll forming provides processing precise complex shape components with uniform structure and strength properties which are 15-20% higher than those of material specification data after conventional heat treatment. 2.
Implementation and Monitoring of Higroregulated Wall Base Ventilation Systems to Control Rising Damp
Online since: July 2015
Authors: V.P. de Freitas, A.S. Guimarães, João M.P.Q. Delgado
Wall base ventilation increases evaporation, which leads to a reduction in the level achieved by the damp front.
Each ventilation subsystem had two relative humidity and temperature probes and two transmitters, a control module and a data acquisition system for the ventilation device operation, registration and control (Freitas et al., 2011).
The data acquisition system stores the values collected by the probes, for posterior evaluation of the solution effectiveness.
This new working scenario presents a substantial reduction of system interruption periods, where potentially condensations occur inside, and a consequent larger amount of water withdrawn.
Each ventilation subsystem had two relative humidity and temperature probes and two transmitters, a control module and a data acquisition system for the ventilation device operation, registration and control (Freitas et al., 2011).
The data acquisition system stores the values collected by the probes, for posterior evaluation of the solution effectiveness.
This new working scenario presents a substantial reduction of system interruption periods, where potentially condensations occur inside, and a consequent larger amount of water withdrawn.
Online since: May 2016
Authors: Kazutoshi Kojima, Johji Nishio, Keiichi Yamada, Kentaro Tamura, Hirokuni Asamizu, Chiaki Kudou, Keiko Masumoto
Introduction
The reduction of the silicon carbide (SiC) wafer off-angle effectively lowers production costs by decreasing material loss when slicing wafers from a single SiC ingot.
Moreover, increasing demands for chip cost reduction per area and large-size chip production have led to a shift in mainstream SiC wafer size from 100 to 150 mm.
These data were collected for 61 triangular defects observed on three 3-inch wafers with a 5-μm-thick epitaxial layer.
The SBH estimate is in good agreement with reported data for Ni/4H-SiC diodes [7].
Moreover, increasing demands for chip cost reduction per area and large-size chip production have led to a shift in mainstream SiC wafer size from 100 to 150 mm.
These data were collected for 61 triangular defects observed on three 3-inch wafers with a 5-μm-thick epitaxial layer.
The SBH estimate is in good agreement with reported data for Ni/4H-SiC diodes [7].
Online since: March 2025
Authors: Erwin Oliver V. Fundador, Blezzie Desales, Khent Ivan Duerme, Noreen Grace V. Fundador
The phenolic compounds present in plants are responsible for the reduction of Ag+ to Ag0.
The phenolic compounds found on the surface of AgNPs provide more active sites for the reduction of silver ions and help in stabilizing the mixture [12].
Data on EDX analysis provides the elemental composition of AgNPs.
On the other hand, DLS analysis (data not shown) revealed that AgNPs had an average hydrodynamic size of 140 nm.
The phenolic compounds found on the surface of AgNPs provide more active sites for the reduction of silver ions and help in stabilizing the mixture [12].
Data on EDX analysis provides the elemental composition of AgNPs.
On the other hand, DLS analysis (data not shown) revealed that AgNPs had an average hydrodynamic size of 140 nm.
Online since: January 2012
Authors: Qi Fen Wang, Mei Jie Yu, Cheng Guo Wang, Wen Bo Lu, Xiu Ying Hu
The corresponding data of Lc and C are listed in Table 1 (“N” and “Y” designate the fibers before and after ultrasonic etching respectively).
The Lc and C values of fibers heated at 255°C, 265°C and 275°C fall sharply after ultrasonic etching, and the fibers heated at 255°C have the largest reduction.
Fig.1 XRD patterns of the fibers heated at different temperatures before and after ultrasonic etching a-195°C, b-205°C, c-225°C, d-235°C, e-245°C, f-255°C, g-265°C, h-275°C, i-275°C, j-275°C Table 1 XRD data based on figuer 1 Stabilized temperatures of the fibers Lc (100) [nm] C [%] N Y N Y 195 °C 10.923 10.287 0.431 0.405 205 °C 12.581 9.909 0.423 0.427 225 °C 13.591 8.868 0.436 0.404 235 °C 12.583 9.304 0.412 0.368 245 °C 12.201 9.258 0.406 0.375 255 °C 10.036 1.863 0.384 0.164 265 °C 6.737 1.717 0.324 0.238 275 °C 5.760 3.246 0.105 0.098 275 °C 4.338 1.829 0.099 -- 275 °C 1.930 -- 0.069 -- The Effect on the Fibrillar Structure.
The Lc and C values of fibers heated at 255°C, 265°C and 275°C fall sharply after ultrasonic etching, and the fibers heated at 255°C have the largest reduction.
The Lc and C values of fibers heated at 255°C, 265°C and 275°C fall sharply after ultrasonic etching, and the fibers heated at 255°C have the largest reduction.
Fig.1 XRD patterns of the fibers heated at different temperatures before and after ultrasonic etching a-195°C, b-205°C, c-225°C, d-235°C, e-245°C, f-255°C, g-265°C, h-275°C, i-275°C, j-275°C Table 1 XRD data based on figuer 1 Stabilized temperatures of the fibers Lc (100) [nm] C [%] N Y N Y 195 °C 10.923 10.287 0.431 0.405 205 °C 12.581 9.909 0.423 0.427 225 °C 13.591 8.868 0.436 0.404 235 °C 12.583 9.304 0.412 0.368 245 °C 12.201 9.258 0.406 0.375 255 °C 10.036 1.863 0.384 0.164 265 °C 6.737 1.717 0.324 0.238 275 °C 5.760 3.246 0.105 0.098 275 °C 4.338 1.829 0.099 -- 275 °C 1.930 -- 0.069 -- The Effect on the Fibrillar Structure.
The Lc and C values of fibers heated at 255°C, 265°C and 275°C fall sharply after ultrasonic etching, and the fibers heated at 255°C have the largest reduction.
Online since: April 2010
Authors: Adolf Schöner, Sergey A. Reshanov, Carl Mikael Zetterling, Romain Esteve
We have recently reported that in the case of 3C-SiC the implementation of wet conditions during
oxidation/post-oxidation steps results in a significant decrease of the interface trap density, in a
reduction of fixed charges in the oxide, and in an increased breakdown field [4].
The main goal with this study is the drastic reduction of mobile and fixed charges present in the oxide and at the SiO2/3C-SiC interface, respectively.
More interesting data are presented in the Weibull plots of Fig. 5.
The Weibull function applied to the collected TZDB data of the postoxidized PECVD oxide (sample #2) demonstrate a steep curve slope and a high maximum breakdown electric field value, while the thermally grown oxide (sample #1) and the post-oxidized LPCVD oxide (sample #3) have a lower maximum breakdown electric field and less steep curve slopes.
The main goal with this study is the drastic reduction of mobile and fixed charges present in the oxide and at the SiO2/3C-SiC interface, respectively.
More interesting data are presented in the Weibull plots of Fig. 5.
The Weibull function applied to the collected TZDB data of the postoxidized PECVD oxide (sample #2) demonstrate a steep curve slope and a high maximum breakdown electric field value, while the thermally grown oxide (sample #1) and the post-oxidized LPCVD oxide (sample #3) have a lower maximum breakdown electric field and less steep curve slopes.
Online since: September 2003
Authors: S.Yu. Karpov, E.N. Mokhov, M.S. Ramm, A.D. Roenkov, A.S. Segal, Yu.A. Vodakov, Heikki Helava, Yu.A. Makarov
We attribute the growth rate reduction
to increasing of the mean gap between the source and
the seed during the growth.
At high gradients (referred to in Fig. 4 as non-optimal conditions), the powder sublimation occurs primarily on the periphery, leading to a gradual reduction in the powder charge diameter (see Fig. 5) and, hence, to a larger mean gap between the source and the seed.
Symbols are experimental data, lines are computations based on the model [8].
Comparison of the lattice constants extracted from the XRD data, � = 0.31152 nm and � = 0.49816 nm, with the literature ones [10] shows that the grown crystals are slightly compressed in a-direction.
At high gradients (referred to in Fig. 4 as non-optimal conditions), the powder sublimation occurs primarily on the periphery, leading to a gradual reduction in the powder charge diameter (see Fig. 5) and, hence, to a larger mean gap between the source and the seed.
Symbols are experimental data, lines are computations based on the model [8].
Comparison of the lattice constants extracted from the XRD data, � = 0.31152 nm and � = 0.49816 nm, with the literature ones [10] shows that the grown crystals are slightly compressed in a-direction.
Online since: September 2013
Authors: Amir Z.A. Kahar, Shaharudin Ahmad, Aidah Jumahat, Mohd Shahneel Saharudin
Their properties including high strength and stiffness to weight ratio, improved corrosion and environmental resistance, design flexibility, improved fatigue life, potential reduction of processing cost and many more have made them superior and popular than any other materials [3-5].
During impact, the materials degrade via reduction of structural stiffness that lead to growth of damage and fracture [6-7].
The velocity and load data are recorded and used to calculate the impact energy.
This data also supported by previous result in the impact energy.
During impact, the materials degrade via reduction of structural stiffness that lead to growth of damage and fracture [6-7].
The velocity and load data are recorded and used to calculate the impact energy.
This data also supported by previous result in the impact energy.
Online since: December 2010
Authors: Fang Min Quan, Lei Dai, Yuan Jie Zuo, Wen Qiang Sun, Jiu Ju Cai
Due to the longer heating time, the heat load of stainless steel has a certain reduction compared with carbon steel, causing that the combustion space is probably not full of the resulting flue gas.
In order to detect the actual temperature in rolling process, these data include the steel centre temperature of the last pass of rough rolling, rolling force of the last pass of rough rolling and deformation energy of roughing mill need to be detected.
Interval of discharging is calculated by Eq. (1) by data in Tables 2 and 3.
Table 4 Temperature reduction of every zone in furnace before rolling stopped zone predicted rolling downtime [min] less than 15 15-30 30-60 60-90 90-120 more than 120 soaking zone [°C] 10 10 20 45 90 reduced to 900 heating zone [°C] 20 30 50 80 120 preheating zone [°C] NA 30 50 80 120 burner closed Note: NA represents not available.
In order to detect the actual temperature in rolling process, these data include the steel centre temperature of the last pass of rough rolling, rolling force of the last pass of rough rolling and deformation energy of roughing mill need to be detected.
Interval of discharging is calculated by Eq. (1) by data in Tables 2 and 3.
Table 4 Temperature reduction of every zone in furnace before rolling stopped zone predicted rolling downtime [min] less than 15 15-30 30-60 60-90 90-120 more than 120 soaking zone [°C] 10 10 20 45 90 reduced to 900 heating zone [°C] 20 30 50 80 120 preheating zone [°C] NA 30 50 80 120 burner closed Note: NA represents not available.