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Online since: April 2013
Authors: Qing Bo Yu, Qin Qin, Jiu Chong Li, Kun Wang
The reduction and oxidation processes were repeated three times.
The experimental procedure diagram of TGA Results and discussion Reactivity data were obtained through analyzing the weight variations during the reduction and oxidation reactions.
The weight changes during 5 cycles of reduction and oxidation reactions.
The reduction and oxidation all have stages of high reaction rates.
For reduction, the temperatures are from 850 to 950℃.
The experimental procedure diagram of TGA Results and discussion Reactivity data were obtained through analyzing the weight variations during the reduction and oxidation reactions.
The weight changes during 5 cycles of reduction and oxidation reactions.
The reduction and oxidation all have stages of high reaction rates.
For reduction, the temperatures are from 850 to 950℃.
Online since: October 2008
Authors: Guadalupe Valverde-Aguilar, Víctor Rentería-Tapia, Jorge A. García-Macedo
The reduction process was monitored by UV-vis
absorption spectroscopy.
The results indicate that it is necessary to consider the presence of oxidized metal particles in order to have a good fit to the experimental data.
This reduction process was monitored by UV-Vis absorption spectroscopy.
The position of the diffraction peaks in the film is in good agreement with those given in ASTM data card (# 40-1054) for silver oxide, and ASTM data card (# 01-1167) for metallic silver.
An excellent fit was obtained by using the experimental data from size-distribution histograms of Fig. 9.
The results indicate that it is necessary to consider the presence of oxidized metal particles in order to have a good fit to the experimental data.
This reduction process was monitored by UV-Vis absorption spectroscopy.
The position of the diffraction peaks in the film is in good agreement with those given in ASTM data card (# 40-1054) for silver oxide, and ASTM data card (# 01-1167) for metallic silver.
An excellent fit was obtained by using the experimental data from size-distribution histograms of Fig. 9.
Online since: February 2014
Authors: Jin Suo Zhang, Wei Zhang, Jian Xu
Energy data and computing method
Carbon emission is mainly come from Fossil energy consumption.
Currently, the carbon emission is mainly computed by macro statistic data of fossil energy consumption.
Most of the data used in the article are from Shaanxi Statistic Almanac.
The other data are completed by Almanac of China Energy Statistic.
Compared the data ,it is found that the yearly decreasing rate of carbon emission intensity of Shaanxi province is less than yearly increasing rate of GDP.
Currently, the carbon emission is mainly computed by macro statistic data of fossil energy consumption.
Most of the data used in the article are from Shaanxi Statistic Almanac.
The other data are completed by Almanac of China Energy Statistic.
Compared the data ,it is found that the yearly decreasing rate of carbon emission intensity of Shaanxi province is less than yearly increasing rate of GDP.
Online since: October 2010
Authors: Xiao Gang Li, Kui Xiao, Qian Liu, Chaofang Dong
The formation and the reduction of CuO or Cu2O were irreversible.
The data in Table 1 as well reveals that either in the lowest concentration or in the highest concentration, there is a passivity region.
The reverse scan shows a cathodic peak was recorded at −0.137 V, which is due to the reduction of copper ions.
And another cathodic peak at −0.726 V corresponds to the electro-reduction of the dissolved oxygen
Moreover, the formation and the reduction of CuO or Cu2O were irreversible.
The data in Table 1 as well reveals that either in the lowest concentration or in the highest concentration, there is a passivity region.
The reverse scan shows a cathodic peak was recorded at −0.137 V, which is due to the reduction of copper ions.
And another cathodic peak at −0.726 V corresponds to the electro-reduction of the dissolved oxygen
Moreover, the formation and the reduction of CuO or Cu2O were irreversible.
Online since: August 2011
Authors: Ola Nilsen, Helmer Fjellvåg, Bengt Gunnar Svensson, Lasse Vines, Mari Alnes, Vincent Quemener, Eduard Monakhov
A reduction of the interface defects correlates with an improvement of the crystal
structure of the ZnO film with a preferred orientation along the c-axis.
However, heat treatment at 500�C results in a reduction of the (002) peak, which indicate a degradation of the crystal orientation along the c-axis.
Annealing at 500�C results in a degradation of the Schottky behavior with a reduction of the rectification and an increase of the series resistance (∼45kΩ).
For ZnO/p-Si samples (Fig. 2b), the heat treatment causes a reduction of the rectifying behavior and treatment above 300�C results in an Ohmic behavior.
A clear relation exists between the I-V measurements and the DLTS data, where the reduction of E(0.07) correlates with the improvement of the Schottky behavior.
However, heat treatment at 500�C results in a reduction of the (002) peak, which indicate a degradation of the crystal orientation along the c-axis.
Annealing at 500�C results in a degradation of the Schottky behavior with a reduction of the rectification and an increase of the series resistance (∼45kΩ).
For ZnO/p-Si samples (Fig. 2b), the heat treatment causes a reduction of the rectifying behavior and treatment above 300�C results in an Ohmic behavior.
A clear relation exists between the I-V measurements and the DLTS data, where the reduction of E(0.07) correlates with the improvement of the Schottky behavior.
Online since: October 2014
Authors: M.A. Kalam, H.H. Masjuki, Y.H. Teoh, H.G. How
B20E5 blend shows reduction in smoke opacity, CO and NOx emissions compared to baseline diesel fuel.
Data acquisition system, 7.
Smoke opacity meter To carry out the combustion analysis, the cylinder pressure was measured with a Kistler 6058A piezoelectric sensor and its signal was recorded with a high speed data acquisition system.
At high load condition, the reduction in CO is more prominent for B20 and B20E5 with 14-15% lower CO emission.
As a result, adding ethanol to biodiesel-blend had more significant effect on the reduction of smoke emission.
Data acquisition system, 7.
Smoke opacity meter To carry out the combustion analysis, the cylinder pressure was measured with a Kistler 6058A piezoelectric sensor and its signal was recorded with a high speed data acquisition system.
At high load condition, the reduction in CO is more prominent for B20 and B20E5 with 14-15% lower CO emission.
As a result, adding ethanol to biodiesel-blend had more significant effect on the reduction of smoke emission.
Online since: August 2016
Authors: Vagner Silva Guilherme, José Adilson de Castro
The results of the simulation indicate an enlargement of the combustion front with the re-circulation of the waste gases and the possibility of existing a reduction of the solid fuel consumption.
Introduction The sintering process is used to partially melt and add the thin particles of iron ore in order to produce sinter to the reduction process in blast furnaces.
Results and Discussion A base case was used based on an industrial data set and, afterward, seven new operation scenarios were calculated (a larger conveyor belt was used).
Such as Guilherme et al., 2012, such process, as a result, increases the calcium-ferrite fraction in the sinter, improving its reduction coefficient.
In: 41° Seminar of iron ore reduction & mineral technology, Vila Velha, ES, 2011.
Introduction The sintering process is used to partially melt and add the thin particles of iron ore in order to produce sinter to the reduction process in blast furnaces.
Results and Discussion A base case was used based on an industrial data set and, afterward, seven new operation scenarios were calculated (a larger conveyor belt was used).
Such as Guilherme et al., 2012, such process, as a result, increases the calcium-ferrite fraction in the sinter, improving its reduction coefficient.
In: 41° Seminar of iron ore reduction & mineral technology, Vila Velha, ES, 2011.
Online since: September 2014
Authors: Shu Li, Lin Zhang
Multidisciplinary Optimization of Helicopter Gearbox Housing
Structural Vibration Based on ARSM
Lin Zhang 1,a, Shu Li 2,b
1Large Aircraft Advanced Training Centre, Beihang University, Beijing 100191, China
2School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China
azhanglin_buaa@163.com, blishu@buaa.edu.cn
Keywords: Vibration reduction; Frequency response; Sensitivity; Orthogonal experimental design; Adaptive response surface method.
Besides, in the process of vibration reduction, structural stress and mass have to meet the design requirements.
It can obtain an approximate expression of the system by way of data fitting.
Table 1 Shell Thicknesses of Gearbox Housing Variable t1 t2 t3 t5 t7 t9 t10 t11 t12 Original Thickness[m] 0.0120 0.010 0.035 0.020 0.008 0.012 0.010 0.008 0.030 New Thickness[m] 0.010 0.008 0.045 0.019 0.005 0.027 0.007 0.005 0.034 Variable t13 t14 t15 t16 t17 t18 t19 t20 t24 Original Thickness[m] 0.027 0.032 0.022 0.036 0.008 0.032 0.020 0.023 0.030 New Thickness[m] 0.028 0.005 0.019 0.047 0.041 0.044 0.007 0.010 0.046 Fig.7 Iteration Process of Objective Fig.8 Contrast of Maximum Nodal Response Summary This paper provides a feasible methodology for the vibration reduction of helicopter gearbox housing in engineering.
The structural vibration and element stress have been optimized in obvious reduction without weight cost.
Besides, in the process of vibration reduction, structural stress and mass have to meet the design requirements.
It can obtain an approximate expression of the system by way of data fitting.
Table 1 Shell Thicknesses of Gearbox Housing Variable t1 t2 t3 t5 t7 t9 t10 t11 t12 Original Thickness[m] 0.0120 0.010 0.035 0.020 0.008 0.012 0.010 0.008 0.030 New Thickness[m] 0.010 0.008 0.045 0.019 0.005 0.027 0.007 0.005 0.034 Variable t13 t14 t15 t16 t17 t18 t19 t20 t24 Original Thickness[m] 0.027 0.032 0.022 0.036 0.008 0.032 0.020 0.023 0.030 New Thickness[m] 0.028 0.005 0.019 0.047 0.041 0.044 0.007 0.010 0.046 Fig.7 Iteration Process of Objective Fig.8 Contrast of Maximum Nodal Response Summary This paper provides a feasible methodology for the vibration reduction of helicopter gearbox housing in engineering.
The structural vibration and element stress have been optimized in obvious reduction without weight cost.
A Study about Energy Consumption and Economic Growth in Qinghai Based on the Co-Integration Analysis
Online since: September 2013
Authors: Pei Ji Shi, Sheng Mei Li, Qiang Zhou
This study analyzed the relationship between GDP increasing and total energy consumption using co-integration method based on 20 sets of annual data during 1992-2011 in Qinghai province.
So energy conservation and emissions reduction are grim.
By far, study about the relationship between Qinghai economic growth and energy consumption of the related research was not much, therefore, this study analysis the relationship between the GDP and total energy consumption of Qinghai province based on 20 groups of Qinghai province between 1992 and 2011 annual data by using co integration.
The Fig.1 Growth rate of energy consumption and GDP and elasticity ratio of energy consumption of China and Qinghai province from 1992 to 2011 trend line estimates of with the corresponding higher fitting degree between the actual data.
Empirical analysis 2.1 The selection of variables and data Data range was from 1992 to 2011(Fig.3), the total energy consumption was a mathematical measure, and unit was tce, GDP are calculated at current prices.
So energy conservation and emissions reduction are grim.
By far, study about the relationship between Qinghai economic growth and energy consumption of the related research was not much, therefore, this study analysis the relationship between the GDP and total energy consumption of Qinghai province based on 20 groups of Qinghai province between 1992 and 2011 annual data by using co integration.
The Fig.1 Growth rate of energy consumption and GDP and elasticity ratio of energy consumption of China and Qinghai province from 1992 to 2011 trend line estimates of with the corresponding higher fitting degree between the actual data.
Empirical analysis 2.1 The selection of variables and data Data range was from 1992 to 2011(Fig.3), the total energy consumption was a mathematical measure, and unit was tce, GDP are calculated at current prices.
Safety Verification of Mechanical Properties of Reinforced Concrete Beam in the Fire by Applying CFD
Online since: January 2013
Authors: Chia Chun Yu, Te Chi Chen, Cherng Shing Lin, Shih Cheng Wang, Chian Yu Peng
And they have employed technology of fire protection engineering and quantified data of theoretical numerical model to create an even more flexible evaluation method for building’s fire protection.
Purpose of the above is to investigate elevated temperature and reduction of mechanical property, as well as verify safety of structure.
Fig. 8 Concrete Compressive strength reduction Table 5 Concrete Compressive strength reduction (kg/c) Beams suffered fire position 0 80cm 160cm 240cm Beam left side distance beam surface at 3.0cm 0 0 0 0 Beam right side distance beam surface at 3.0cm 0 0 0 0 Beam center 159.4 156.23 155.22 156.23 Steel Bars Yield Strength Simulation Discussion.
Steel bars’ reduction of strength after undergoing a fire is shown in Table 6.
The steel bars inside the beam approach the temperature threshold of strength reduction.
Purpose of the above is to investigate elevated temperature and reduction of mechanical property, as well as verify safety of structure.
Fig. 8 Concrete Compressive strength reduction Table 5 Concrete Compressive strength reduction (kg/c) Beams suffered fire position 0 80cm 160cm 240cm Beam left side distance beam surface at 3.0cm 0 0 0 0 Beam right side distance beam surface at 3.0cm 0 0 0 0 Beam center 159.4 156.23 155.22 156.23 Steel Bars Yield Strength Simulation Discussion.
Steel bars’ reduction of strength after undergoing a fire is shown in Table 6.
The steel bars inside the beam approach the temperature threshold of strength reduction.