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Online since: February 2012
Authors: Jian Hua Li, Zhen Xi
However, the calculation workload is too large to process data for large area.
Discrete liner transformation of potential field data [J].
Geophysics, 1989, 54(4): 497-507. ] advanced this method, but data of large area is always difficult to be solved.
The data were gridded and then upward continued 25 meters.
The resulting data and error estimates were inverted with standard inversion parameters.
Discrete liner transformation of potential field data [J].
Geophysics, 1989, 54(4): 497-507. ] advanced this method, but data of large area is always difficult to be solved.
The data were gridded and then upward continued 25 meters.
The resulting data and error estimates were inverted with standard inversion parameters.
Online since: February 2012
Authors: Guo Guang Liu, Wen Ying Lv, Long Li Lin
The result showed that the coexistence of Cu(Ⅱ) and citric acid was favourable to the photocatalytic oxidation and reduction.
Table 2 Percentage content of major Cu(Ⅱ) species Sample Cu2+ CuL CuHL CuH2L Cu(OH)L Cu2+ 100 - - - - Cu2+-Cit 18.71 - - 81.21 - 3.Results and Discussion 3.1 Changes of the suspension pH Table 3 contains data on the suspension pH after experiment.
The reduction reaction kinetics is thus found to follow the zero order with respect to Cu(Ⅱ) concentration.
(b) Cu(Ⅱ) was more feasible in photocatalytic reduction in the presence of citric acid.
Fig.1 Cu(Ⅱ) photocatalytic reduction (molar ratio of Cu(Ⅱ) : citric acid was 1:1). 3.3.
Table 2 Percentage content of major Cu(Ⅱ) species Sample Cu2+ CuL CuHL CuH2L Cu(OH)L Cu2+ 100 - - - - Cu2+-Cit 18.71 - - 81.21 - 3.Results and Discussion 3.1 Changes of the suspension pH Table 3 contains data on the suspension pH after experiment.
The reduction reaction kinetics is thus found to follow the zero order with respect to Cu(Ⅱ) concentration.
(b) Cu(Ⅱ) was more feasible in photocatalytic reduction in the presence of citric acid.
Fig.1 Cu(Ⅱ) photocatalytic reduction (molar ratio of Cu(Ⅱ) : citric acid was 1:1). 3.3.
Online since: September 2013
Authors: Bing Nan Ren, Qiao Wen Yang
Then the catalyst was characterized by BET, TEM and XPS, and the catalytic activity of the catalyst for selective catalytic reduction (SCR) of NO at low-temperature was investigated.
The NO conversion was improved with reduction temperature increase under 250℃, increased slowly over 250℃.
Table 1 BET specific surface area and pore structure analysis of carbon nano tubes Samples SBET [m2/g] Pore volume [cm3/g] Mean pore size [nm] CNTs after purification 145.1517 0.776334 23.7064 2#Mn/CNTs catalyst 111.8898 0.576013 23.1726 3#Mn/CNTs catalyst 96.4381 0.490601 21.2062 It can be found that the specific surface area, pore volume, and mean pore size of catalyst all slightly decreased, but decreased significantly when compared with carrier (CNTs after purification) by making comparisons of data in Table 1, which illustrated that the metallic oxide loaded on the surface of carrier after impregnation allowed the carrier confront with severe pore blocking phenomenon leading to the specific surface area, pore volume, and mean pore size all decreased.
During the process of the experiment, within the temperature scope of 150~200℃, the consumption of NH3 was mainly for NO reduction reaction, and NO conversion rate increased rapidly.
Mn-Ce/ZSM as a new superior catalyst for NO reduction with NH3.
The NO conversion was improved with reduction temperature increase under 250℃, increased slowly over 250℃.
Table 1 BET specific surface area and pore structure analysis of carbon nano tubes Samples SBET [m2/g] Pore volume [cm3/g] Mean pore size [nm] CNTs after purification 145.1517 0.776334 23.7064 2#Mn/CNTs catalyst 111.8898 0.576013 23.1726 3#Mn/CNTs catalyst 96.4381 0.490601 21.2062 It can be found that the specific surface area, pore volume, and mean pore size of catalyst all slightly decreased, but decreased significantly when compared with carrier (CNTs after purification) by making comparisons of data in Table 1, which illustrated that the metallic oxide loaded on the surface of carrier after impregnation allowed the carrier confront with severe pore blocking phenomenon leading to the specific surface area, pore volume, and mean pore size all decreased.
During the process of the experiment, within the temperature scope of 150~200℃, the consumption of NH3 was mainly for NO reduction reaction, and NO conversion rate increased rapidly.
Mn-Ce/ZSM as a new superior catalyst for NO reduction with NH3.
Online since: March 2012
Authors: Xu Dong Yang, Dong Sun
Weight-reduction Optimization Design For Milling Planer Bed
Based on Finite Element Analysis
Dong Sun1, a, Xudong Yang1, b
1 School of Mechanical Engineering, Guizhou University, Guiyang, Guizhou, China
apilliar3660@163.com, byxd_gzu@163.com
Keywords: Milling planer bed, Weight-reduction, FEA, Static stiffness, Dynamic characteristics
Abstract.
Three-dimensional modeling method is used to calculate the exact weight of the bed and then finite element analysis is used to research the static and dynamic characteristics before and after weight-reduction.
Table 1 The preceding 10 orders natural frequencies Order 1 2 3 4 5 6 7 8 9 10 Frequency 300.1 304.0 311.9 322.6 327.5 328.7 331.9 334.4 339.2 339.5 a) b) c) Fig.4 The vibration modes a-The first vibration mode, b-The second vibration mode, c-The ninth vibration mode Weight-reduction Optimization Design Considering the variety of economic factors of the company, to minimize the rectification of the existing wood patterns, installation foundations and the corresponding drawings, the size of the outer contour remains the same in the weight-reduction optimization design and only the wall thickness is thinned.
The comparison data is shown in Table 2.
Table 2 The comparison data of milling planer and planer milling machine (Length: mm) Product Name Driving Motor for Worktable (KW) Driving Motor for Milling Head (KW) Center Distance of two guides Load on Guide Surfaces (Kg/m) Thickness of Guide Surfaces Wall Thickness Thickness and Type of Reinforcing Plates Height of Bed Reference Machine 132 15 1300 3200 40 25 20, well-shaped 770 Milling Planer 15 7.5 900 2500 50 30 25, herringbone 700 The above data shows that the workload of the milling planer is much smaller than the reference object, structure and size that meet the reference machine can meet the milling planer theoretically.
Three-dimensional modeling method is used to calculate the exact weight of the bed and then finite element analysis is used to research the static and dynamic characteristics before and after weight-reduction.
Table 1 The preceding 10 orders natural frequencies Order 1 2 3 4 5 6 7 8 9 10 Frequency 300.1 304.0 311.9 322.6 327.5 328.7 331.9 334.4 339.2 339.5 a) b) c) Fig.4 The vibration modes a-The first vibration mode, b-The second vibration mode, c-The ninth vibration mode Weight-reduction Optimization Design Considering the variety of economic factors of the company, to minimize the rectification of the existing wood patterns, installation foundations and the corresponding drawings, the size of the outer contour remains the same in the weight-reduction optimization design and only the wall thickness is thinned.
The comparison data is shown in Table 2.
Table 2 The comparison data of milling planer and planer milling machine (Length: mm) Product Name Driving Motor for Worktable (KW) Driving Motor for Milling Head (KW) Center Distance of two guides Load on Guide Surfaces (Kg/m) Thickness of Guide Surfaces Wall Thickness Thickness and Type of Reinforcing Plates Height of Bed Reference Machine 132 15 1300 3200 40 25 20, well-shaped 770 Milling Planer 15 7.5 900 2500 50 30 25, herringbone 700 The above data shows that the workload of the milling planer is much smaller than the reference object, structure and size that meet the reference machine can meet the milling planer theoretically.
Online since: June 2014
Authors: Mohammad Alharthy, Nidal H. Abu-Hamdeh
The input data for the pilot model were; 12 teeth with module of 5, face width 50 mm, pitch diameter of 60 mm and outside diameter of 70 mm.
The stress obtained was 127.7 MPa which is about 18.7 % reduction in Von Mises stress.
A maximum of 25% reduction in maximum Von Mises stress was obtained in this analysis.
The stress obtained for this case was 108.2 MPa which yielded a 31.1 % reduction compared to the pilot case.
Brown, Gear Stress Reduction Using Internal Stress Relief Features, Journal of Mechanical Design 119 (1997) 518-521
The stress obtained was 127.7 MPa which is about 18.7 % reduction in Von Mises stress.
A maximum of 25% reduction in maximum Von Mises stress was obtained in this analysis.
The stress obtained for this case was 108.2 MPa which yielded a 31.1 % reduction compared to the pilot case.
Brown, Gear Stress Reduction Using Internal Stress Relief Features, Journal of Mechanical Design 119 (1997) 518-521
Online since: July 2011
Authors: Fang Zhou, Lei Shi, Bing Yu Chen, Zhong Ma
Previous studies of total factor productivity (TFP) mainly focus on time series data concerning economic aggregate.
Methodology and data Methodology.
Data.
The sources of capital stock data are based on the perpetual inventory method, proposed in Zhang et al (2007) [9].
The rest data come from “China Statistical Yearbook” and “China Energy Statistical Yearbook” from 1995 to 2008.
Methodology and data Methodology.
Data.
The sources of capital stock data are based on the perpetual inventory method, proposed in Zhang et al (2007) [9].
The rest data come from “China Statistical Yearbook” and “China Energy Statistical Yearbook” from 1995 to 2008.
Online since: August 2010
Authors: Toru Fujii, Takahiko Yoshi, Kazuya Okubo
Stiffness reduction of woven CFRP and CFRTP spring under ultra high
cyclic fatigue for vibration conveyor
Takahiko Yoshi
1, Kazuya Okubo
2, and Toru Fujii3
1-3
1-3, Tatara-miyakodani, Kyotanabe, Kyoto, Japan,
1
dtj0381@mail4.doshisha.ac.jp,
2
kokubo@mail.doshisha.ac.jp,
3
tfujii@mail.doshisha.ac.jp
Key words: CFRP, CFRTP, ultra high cyclic fatigue, high humidity, stiffness reduction
Abstract.
However few studies investigated the fatigue behavior of CFRP under ultra high cyclic fatigue loading at high humidity condition, while same data was shown by researchers [5].
Result and Discussion Stiffness reduction of CFRP spring under ultra high cyclic fatigue Fig. 3 shows the reduction rate of frequency as a function of number of loading cycles in the CFRP spring.
Stiffness reduction of CFRTP spring without loading To prevent the stiffness reduction accompanying with such damages which might be induced by the hydrolysis in epoxy shown in Fig. 5(a) under high humidity condition, PET film was utilized as the material of matrix for the CFRTP spring plate.
Prevention of stiffness reduction of plate spring Fig. 7 shows the reduction rate of frequency as a function of number of loading cycles in CFRTP spring.
However few studies investigated the fatigue behavior of CFRP under ultra high cyclic fatigue loading at high humidity condition, while same data was shown by researchers [5].
Result and Discussion Stiffness reduction of CFRP spring under ultra high cyclic fatigue Fig. 3 shows the reduction rate of frequency as a function of number of loading cycles in the CFRP spring.
Stiffness reduction of CFRTP spring without loading To prevent the stiffness reduction accompanying with such damages which might be induced by the hydrolysis in epoxy shown in Fig. 5(a) under high humidity condition, PET film was utilized as the material of matrix for the CFRTP spring plate.
Prevention of stiffness reduction of plate spring Fig. 7 shows the reduction rate of frequency as a function of number of loading cycles in CFRTP spring.
Online since: May 2015
Authors: Tzu Hsia Chen, Long Chang Hsieh, Hsiu Chen Tang
Based on the involute theorem, the gear data of helical spur gear pair is obtained.
According to the gear data, its corresponding engineering drawing is accomplished.
Based on the involute theorem, the gear data of helical spur gear pair is obtained.
Then, according to the gear data, its corresponding engineering drawing is accomplished.
According to the gear data, its corresponding engineering drawing is accomplished.
According to the gear data, its corresponding engineering drawing is accomplished.
Based on the involute theorem, the gear data of helical spur gear pair is obtained.
Then, according to the gear data, its corresponding engineering drawing is accomplished.
According to the gear data, its corresponding engineering drawing is accomplished.
Online since: February 2013
Authors: Jin Bo Song, Zhou Yu Zeng
Through the Ethernet switch conveniently and other systems for the connection and data information sharing, for the large-scale system can also set the data server and gateway server and other systems for the connection.
The method further interpretation Various types of buildings using electronic remote intelligent measuring instrument of energy consumption data ( such as electricity, water, temperature and humidity ), will realize all kinds of energy consumption data real-time acquisition and uploads to the center server.
Data transmission cable ( RJ45 LAN network port ) / wireless ( GPRS/CDMA ) for data remote transmission.
The data packet will be transmitted to the " energy saving supervision platform " in the database, a large amount of historical data is permanently stored, to facilitate future calls, analysis and reference as shown in Fig.2.
Fig.2 System hierarchical structure Internet consumption monitoring Combination of campus GIS geographic information, to the environment as the background, the building energy consumption data as the analysis object, can be intuitive for energy consumption data were analyzed, at the same time application, mobile phone, PDA and many other data terminal to implement energy detection.
The method further interpretation Various types of buildings using electronic remote intelligent measuring instrument of energy consumption data ( such as electricity, water, temperature and humidity ), will realize all kinds of energy consumption data real-time acquisition and uploads to the center server.
Data transmission cable ( RJ45 LAN network port ) / wireless ( GPRS/CDMA ) for data remote transmission.
The data packet will be transmitted to the " energy saving supervision platform " in the database, a large amount of historical data is permanently stored, to facilitate future calls, analysis and reference as shown in Fig.2.
Fig.2 System hierarchical structure Internet consumption monitoring Combination of campus GIS geographic information, to the environment as the background, the building energy consumption data as the analysis object, can be intuitive for energy consumption data were analyzed, at the same time application, mobile phone, PDA and many other data terminal to implement energy detection.
Online since: October 2013
Authors: Wen Yi Deng, Ya Xin Su, Li Ming Ren
NO reduction efficiency depends strongly on the redox process of iron/iron oxides.
Fig 2 NO reduction efficiency by iron Fig 3 Durable reaction of NO reduction by CO/CH4 in simulated flue gas at 1050 ˚C A durable test of NO reduction by iron in N2 atmosphere was conducted at 800˚C since the NO reduction efficiency was almost 100% at 800˚C (refer to Fig 2).
This showed that CO was not good reductant for NO reduction by iron in durable application.
NO reduction quickly increased to over 98% as CH4 was fed.
NO is chemically reduced to N2 by iron according to the following reaction: Fe + NO®FexOy + N2 According to the thermodynamic calculations using data from the JANAF tables (1985), it is possible for metallic iron to be completely oxidized to Fe2O3 when NO volume fraction is less than 0.05% at 700-900 ˚C.
Fig 2 NO reduction efficiency by iron Fig 3 Durable reaction of NO reduction by CO/CH4 in simulated flue gas at 1050 ˚C A durable test of NO reduction by iron in N2 atmosphere was conducted at 800˚C since the NO reduction efficiency was almost 100% at 800˚C (refer to Fig 2).
This showed that CO was not good reductant for NO reduction by iron in durable application.
NO reduction quickly increased to over 98% as CH4 was fed.
NO is chemically reduced to N2 by iron according to the following reaction: Fe + NO®FexOy + N2 According to the thermodynamic calculations using data from the JANAF tables (1985), it is possible for metallic iron to be completely oxidized to Fe2O3 when NO volume fraction is less than 0.05% at 700-900 ˚C.