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Online since: October 2015
Authors: Ku Halim Ku Hamid, Kamariah Noor Ismail, Siti Aminah Md Ali
Temperature programmed reduction (TPR-H2) analysis was used to evaluate the reduction properties of the synthesized NiCo/SiO2 catalyst using Auto Chem II 2920 (Micromeritics).
The reaction data were collected at reduction condition of 350ºC, 1bar, total GHSV 30,000mL/gcat.h, H2/CO2=4:1.
This can be ascribed to the reduction of Co3O4 to CoO.
This peak was suggested to the reduction of CoO to Co and NiO to Ni [9,15].
This can be supported with the decreased in reduction temperature of α and β peaks.
The reaction data were collected at reduction condition of 350ºC, 1bar, total GHSV 30,000mL/gcat.h, H2/CO2=4:1.
This can be ascribed to the reduction of Co3O4 to CoO.
This peak was suggested to the reduction of CoO to Co and NiO to Ni [9,15].
This can be supported with the decreased in reduction temperature of α and β peaks.
Online since: November 2010
Authors: Cheng Guang Zhang, Juan Miao, Kong Zhao Li
An earlier report on pulse deposited ZnSe films presented data on the ZnSe films deposited at different duty cycles [8].
So it promotes the reduction of the ZnSe films.
The position of Zn2+ adsorption is occupied by other substance (such as H2SeO3), Zn2+ reduction is fewer than HSeO3- reduction, so it advantageously forms Se groups.
So the reduction of selenium would decrease and the reduction of zinc would increase.
Therefore, it promotes the Zn2+ adsorption and the Se reduction, promotes the co-deposition of ZnSe.
So it promotes the reduction of the ZnSe films.
The position of Zn2+ adsorption is occupied by other substance (such as H2SeO3), Zn2+ reduction is fewer than HSeO3- reduction, so it advantageously forms Se groups.
So the reduction of selenium would decrease and the reduction of zinc would increase.
Therefore, it promotes the Zn2+ adsorption and the Se reduction, promotes the co-deposition of ZnSe.
Online since: June 2011
Authors: John A. Taylor
The issue of dross reduction has been on the agenda of cast houses for many years but it remains a poor cousin to the reduction, carbon and casting processes and therefore progress has been generally slow.
There are some major problems preventing serious attention to dross reduction.
Despite a plethora of data obtained through this means, there has to date been no oxidation rate model generated that can be readily used to predict the amounts of oxide (and hence dross) that might occur during normal industrial melt handling scenarios.
It was found using this experimental data combined with other sourced data that the overall oxidation rate (OOR) at a mean of 800°C (750-850°C range) is governed by a power law relationship of the form, OOR = a·tb (g m-2 s-1) where t is holding time (seconds) and a, b are fitting constants.
It was therefore considered little wonder that these weight gains were not measurable using the installed load cells and data gathering equipment.
There are some major problems preventing serious attention to dross reduction.
Despite a plethora of data obtained through this means, there has to date been no oxidation rate model generated that can be readily used to predict the amounts of oxide (and hence dross) that might occur during normal industrial melt handling scenarios.
It was found using this experimental data combined with other sourced data that the overall oxidation rate (OOR) at a mean of 800°C (750-850°C range) is governed by a power law relationship of the form, OOR = a·tb (g m-2 s-1) where t is holding time (seconds) and a, b are fitting constants.
It was therefore considered little wonder that these weight gains were not measurable using the installed load cells and data gathering equipment.
Online since: January 2024
Authors: Ratchagaraja Dhairiyasamy, Vetrivel Kumar Kandasamy, Silambarasan Rajendran
The specific goals include defining an experimental methodology, studying physicochemical properties, and analyzing data correlations.
Data collection adhered to technical standards and instrument manufacturer guidelines.
Thermocouples placed at different points within the generator set were linked to a data acquisition system.
The recorded temperature averages at ten-second intervals facilitated data transfer to a microcomputer.
Data Availability: The author commits to providing data upon request to support the findings of the work.
Data collection adhered to technical standards and instrument manufacturer guidelines.
Thermocouples placed at different points within the generator set were linked to a data acquisition system.
The recorded temperature averages at ten-second intervals facilitated data transfer to a microcomputer.
Data Availability: The author commits to providing data upon request to support the findings of the work.
Online since: December 2011
Authors: Jui Chang Lin, Wei Shin Lin, Yuan Chuan Hsu, Bean Yin Lee
The simulate result found that, the larger the reduction ratio, the higher the forming load.
However, the effect of reduction ratio on spring back is not that remarkable.
The wire diameter D in this study was selected as 0.9, 1.18 and 1.575 mm, and the thickness reduction ration would be 33.33 % for 0.9mm, 15.24% for 1.18 mm and 11.11% for 1.575 mm.
When the diameter of wire is 0.9 mm, due to its biggest reduction ratio, which needs the biggest forming load, its deflection of roller is also the biggest.
Hsieh ‘s assistance of computer simulation and data processing.
However, the effect of reduction ratio on spring back is not that remarkable.
The wire diameter D in this study was selected as 0.9, 1.18 and 1.575 mm, and the thickness reduction ration would be 33.33 % for 0.9mm, 15.24% for 1.18 mm and 11.11% for 1.575 mm.
When the diameter of wire is 0.9 mm, due to its biggest reduction ratio, which needs the biggest forming load, its deflection of roller is also the biggest.
Hsieh ‘s assistance of computer simulation and data processing.
Online since: October 2010
Authors: Sheng Zhi Li, Lan Wei Hu, Wen Hua Meng, Bo Ding, Jian Min Zheng, Jian Cong Zheng
The Fomichev plug is of characteristic producing equal unit-reduction of wall thickness along its perforation section during seamless tube piercing.
Li Shengzhi in paper [4] showed a 2-D coupled thermal-mechanical simulation of center-crack occurrence during 2-roll rotary rolling process assisted by FE code MSC.SuperForm, and obtained the critical percentage of diameter reduction by comparing the simulation results with experimental data.
Differences between the Fomichev plug and conventional plug The Fomichev plug is of characteristic producing equal unit-reduction of wall thickness aiming to make metal deformation well-distributed along its perforation section, and reduce the drag resistance to longitudinal flow of the metal at the inner surface of the workpiece.
The perforation section generatrix of the novel Fomichev plug discussed in this paper is represented by formula (1): (1) where Rp(x) is plug diameter of the point x in axial coordinate; R(x) is the roll opening at the point x in axial coordinate; SHE is the ideal wall thickness of hollow shell at the intersection between perforating and smoothing section of the plug; Cav is the average reduction ratio of wall thickness.
This kind of plug is somewhat universal, but its flaw is that the wall-thickness reduction of workpiece focuses on one part of the plug in piercing.
Li Shengzhi in paper [4] showed a 2-D coupled thermal-mechanical simulation of center-crack occurrence during 2-roll rotary rolling process assisted by FE code MSC.SuperForm, and obtained the critical percentage of diameter reduction by comparing the simulation results with experimental data.
Differences between the Fomichev plug and conventional plug The Fomichev plug is of characteristic producing equal unit-reduction of wall thickness aiming to make metal deformation well-distributed along its perforation section, and reduce the drag resistance to longitudinal flow of the metal at the inner surface of the workpiece.
The perforation section generatrix of the novel Fomichev plug discussed in this paper is represented by formula (1): (1) where Rp(x) is plug diameter of the point x in axial coordinate; R(x) is the roll opening at the point x in axial coordinate; SHE is the ideal wall thickness of hollow shell at the intersection between perforating and smoothing section of the plug; Cav is the average reduction ratio of wall thickness.
This kind of plug is somewhat universal, but its flaw is that the wall-thickness reduction of workpiece focuses on one part of the plug in piercing.
Online since: April 2012
Authors: M.A.G. Figueiredo, G.V. Estrela, W.C. Souza, G.V. Azevedo, H.L. Corrêa
Generated mainly by the burning of fossil fuels, their reduction can be achieved by changes in the conditions of refining processes, capable of adapting the legal specifications of fuel sulphur and nitrogen, or by treatment of gases exhausted.
About the reduction of NOx indices generated in diesel engines, it is possible to choose the technologies related to fixed bed treatment for removal of nitrogen compounds [2], injection systems much more efficient and improvement of combustion chambers and finally, the treatment of gases exhausted.
The main reactions involved in the process of reduction are described by Equations 1 and 2
(1) (2) As the gases exhausted from diesel contains quantities of NOx greater than 90%, the main reaction that occurs in the SCR (Selective Catalytic Reduction) is described by Equation 1, where ammonia and nitrogen monoxide are in the stoichiometric quantities of 1: 1.
The acceptable error was 5% and the data obtained in the analysis of samples are presented in Table 1.
About the reduction of NOx indices generated in diesel engines, it is possible to choose the technologies related to fixed bed treatment for removal of nitrogen compounds [2], injection systems much more efficient and improvement of combustion chambers and finally, the treatment of gases exhausted.
The main reactions involved in the process of reduction are described by Equations 1 and 2
(1) (2) As the gases exhausted from diesel contains quantities of NOx greater than 90%, the main reaction that occurs in the SCR (Selective Catalytic Reduction) is described by Equation 1, where ammonia and nitrogen monoxide are in the stoichiometric quantities of 1: 1.
The acceptable error was 5% and the data obtained in the analysis of samples are presented in Table 1.
Online since: December 2013
Authors: Yan Liu, Yong Gang Wang, Jin Kai Xu, Xiao Zhou Li
Power module, controller, all kinds of sensor data acquisition and processing module are installed in the controller box.
The Task layer is composed of embedded computer, data and image acquisition card and various sensors, CCD and other components.
AT89C51 responses the control instruction of Task layer and then send the data package including the speed, angle of rotation and position data to the digital actuator to drive them.
Besides, AT89C51 receives the feedback data from the actuator and then send the data to PC104.The communication between MCU and actuator is by the MAX485.
The steering engine is a kind of motor system including DC servo motor, motor controller integrated circuit (IC), reduction gear unit and feedback potentiometer.
The Task layer is composed of embedded computer, data and image acquisition card and various sensors, CCD and other components.
AT89C51 responses the control instruction of Task layer and then send the data package including the speed, angle of rotation and position data to the digital actuator to drive them.
Besides, AT89C51 receives the feedback data from the actuator and then send the data to PC104.The communication between MCU and actuator is by the MAX485.
The steering engine is a kind of motor system including DC servo motor, motor controller integrated circuit (IC), reduction gear unit and feedback potentiometer.
Online since: December 2023
Authors: Matthias Schmidtchen, Ulrich Prahl, Max Weiner, Tilo Zienert, Jana Hubálková, Christos G. Aneziris
However, sintering behavior is heavily de- pendent on the morphology of the powder particles, since sintering progress is driven by reduction of the bound surface energy.
Morphology data are obtained from microscopic imaging by extracting the 2D contours.
Constrained freedom in movement in contact zones between particles introduces additional stresses which are influencing the generate particle group simulate particle group powder data average sintering behavior generate particle group simulate particle group generate particle group simulate particle group Fig. 2.
Therefore, it was decided to draw all sieve classes together for the description of the parameters o, hp and np to minimize the effort of data collection, since the measurement of one particle took about 10 min.
This offers the possibility to lower experimental effort for data generation.
Morphology data are obtained from microscopic imaging by extracting the 2D contours.
Constrained freedom in movement in contact zones between particles introduces additional stresses which are influencing the generate particle group simulate particle group powder data average sintering behavior generate particle group simulate particle group generate particle group simulate particle group Fig. 2.
Therefore, it was decided to draw all sieve classes together for the description of the parameters o, hp and np to minimize the effort of data collection, since the measurement of one particle took about 10 min.
This offers the possibility to lower experimental effort for data generation.
Online since: September 2014
Authors: Geun Min Choi
The basic requirements for a future integration device are minimum feature size reduction with device integration and high-speed operation with sufficient cell capacitance.
Furthermore, the amount of air exhaust from the wet system is drastically reduced, resulting in a reduction of clean air production volume.
Both in line data and final yield improvement data (0.3 to 0.5% yield up) validates the effectiveness of this cleaning step (Figure 1).
Especially, the reduction of its etch rate is critical as the film thickness decreases.
Figure 4 compares the dependence of metal particles removal efficiency with a high oxidation-reduction potential(ORP) value.
Furthermore, the amount of air exhaust from the wet system is drastically reduced, resulting in a reduction of clean air production volume.
Both in line data and final yield improvement data (0.3 to 0.5% yield up) validates the effectiveness of this cleaning step (Figure 1).
Especially, the reduction of its etch rate is critical as the film thickness decreases.
Figure 4 compares the dependence of metal particles removal efficiency with a high oxidation-reduction potential(ORP) value.