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Online since: March 2013
Authors: Qing Jun Ding, Fa Zhou Wang, Jun Fu, Lu Han
This paper refers to domestic and foreign standard and research data, shear rivet construction cost, technology and economy.The arrangement spacing of calculate shear connector are 300mm, 400mm, 500mm.Counting and analysis thedesign indicators of bridge pavement, the result as shown in Fig. 3 and Fig. 4.
According to the existing domestic and foreign data, and the surface vibration construction requirements.The shear rivet height is the shear connector height of calculation.
The results as shown in Figure 8-9, the data indicate that the alterative shear rivet diameter and maximum lateral tensile stress of paving layer surface, maximum lateral shear stress of paving layer surface, maximum longitudinal tensile stress of paving layer surface, shear stress between lightweight concrete and steel plate, partial deflection to span ratio of reinforcing rib present a linear relationship, but there are less affected to it; shear rivet diameter increase from 8mm to 12mm, the maximum stress of paving layer surface decreased from 0.244MPa to 0.195MPa, the maximum shear stress betweenlightweight concrete and steel plate is only increased by 0.01MPa, its influence is almost negligible.The increasing of shear rivet height is benefit tothe reducingof partial deflection to span ratio of reinforcing rib.Comprehensive considering the existing specification, the requirements of welding steel box and the requirement of economy,based on this, the diameter of 10mm is more appropriate
Fig.8Shear rivet diameter effect on stress Fig.9Shear rivet diameter effect on partial deflection to span of reinforcing rib Analysis of lightweight concrete thickness effect on pavement project.In the pavement project, the thickness of lightweight concrete and SMA 13 apparently has some influence on performance, SMA 13 is mainly used as the top layer to provide stable travelling, skid resistance, noise reduction and other functional indexes, according to existing specification generally taken for 40mm; but the lower layer thickness of ordinary concrete generally taken 50-80mm, pavement thickness of lightweight concrete need comprehensively consider existing specification and economic property in the project.
The results as shown in Fig. 9-10, data indicates that, maximum lateral tensile stress of paving layer and maximum longitudinal tensile stress of surface is reducedwith the increasing of concrete pavement thickness, but the change is very little.
According to the existing domestic and foreign data, and the surface vibration construction requirements.The shear rivet height is the shear connector height of calculation.
The results as shown in Figure 8-9, the data indicate that the alterative shear rivet diameter and maximum lateral tensile stress of paving layer surface, maximum lateral shear stress of paving layer surface, maximum longitudinal tensile stress of paving layer surface, shear stress between lightweight concrete and steel plate, partial deflection to span ratio of reinforcing rib present a linear relationship, but there are less affected to it; shear rivet diameter increase from 8mm to 12mm, the maximum stress of paving layer surface decreased from 0.244MPa to 0.195MPa, the maximum shear stress betweenlightweight concrete and steel plate is only increased by 0.01MPa, its influence is almost negligible.The increasing of shear rivet height is benefit tothe reducingof partial deflection to span ratio of reinforcing rib.Comprehensive considering the existing specification, the requirements of welding steel box and the requirement of economy,based on this, the diameter of 10mm is more appropriate
Fig.8Shear rivet diameter effect on stress Fig.9Shear rivet diameter effect on partial deflection to span of reinforcing rib Analysis of lightweight concrete thickness effect on pavement project.In the pavement project, the thickness of lightweight concrete and SMA 13 apparently has some influence on performance, SMA 13 is mainly used as the top layer to provide stable travelling, skid resistance, noise reduction and other functional indexes, according to existing specification generally taken for 40mm; but the lower layer thickness of ordinary concrete generally taken 50-80mm, pavement thickness of lightweight concrete need comprehensively consider existing specification and economic property in the project.
The results as shown in Fig. 9-10, data indicates that, maximum lateral tensile stress of paving layer and maximum longitudinal tensile stress of surface is reducedwith the increasing of concrete pavement thickness, but the change is very little.
Online since: December 2018
Authors: Wen Ming Zhang, Yun Hua Zhao, Qiu Hua Gao, Qi Chang He
When voltage is applied between the electrodes, the electric field-induced Maxwell stress results in thickness reduction and area expansion, which can be used for actuation.
All measured signals were collected by a data acquisition card (DONGHUA, DH5902).
The red circles represent the experimental data and the solid curve represents the fit determined by the analytical model with shear modulus and material constant .
The pink squares and solid line respectively represent experimental data and simulation of the proposed DEA where initial magnet distance is taken as .
While blue empty squares represent corresponding experimental data with the same voltage as the pink filled squares.
All measured signals were collected by a data acquisition card (DONGHUA, DH5902).
The red circles represent the experimental data and the solid curve represents the fit determined by the analytical model with shear modulus and material constant .
The pink squares and solid line respectively represent experimental data and simulation of the proposed DEA where initial magnet distance is taken as .
While blue empty squares represent corresponding experimental data with the same voltage as the pink filled squares.
Online since: May 2013
Authors: Qi Hong Zhu, Hong Xia Xia
Results and analysis
2.1 The regression equation
Using DPS data processing system fit the experiment data by the way of quadratic regression and orthogonal rotation combination test counting.The regression equation as follows:
Y=77.06250-4.69914X1+3.43848X2 -2.31875X12+4.38125X22 -2.25000X1X2 (1)
2.2 Significance test for quadratic-regression model
In order to verify the effectiveness of regression equation, it followed the testing procedures, F1= fit mean square / error mean square, F2= regression mean square /residual mean square, F3= regression mean square / error mean square.
F2 was extremely significant at 0.01 level (F0.01(5,10)=5.64<F 2=12.575), showing that the cooperation of equation and experimental data was applicable, and it could be employed to establish the model.
Table 2 Test results and variance analysis variation sources square sum degrees of freedom mean square ratio F P value regression 488.0657 5 97.6131 F2=12.575 0.0060 surplus 77.6236 10 7.7624 lack of fit 57.1648 3 19.0549 F1=6.520 0.0102 error 20.4588 7 2.9227 summation 565.6894 15 According to Table2,regression equation after be reduced on the α=0.10 level of significance except indistinctive item as follow: Y= 77.06250-4.69914X1+3.43848X2-2.31875X12 +4.38125X22 (2) The correlation coefficient between the removal rate of P in the sewage and the diameter as well as the thickness R2= regression quadratic sum /total sum of square =0.8628, showing that the influences of the two factors in this mathematical model on the removal rate of P was about 86.28%, while both the influences of other factors and error occupied 13.72%. 2.4 Effect analysis 2.4.1 Effect analysis for main factors Any factor was fixed at the zero level with “reduction
Conclusion (1) With the theory and method of regression design, the experiment condition was optimized through the DPS data processing system: the diameter was 10.94mm, while the filling thickness was 100.45mm.
F2 was extremely significant at 0.01 level (F0.01(5,10)=5.64<F 2=12.575), showing that the cooperation of equation and experimental data was applicable, and it could be employed to establish the model.
Table 2 Test results and variance analysis variation sources square sum degrees of freedom mean square ratio F P value regression 488.0657 5 97.6131 F2=12.575 0.0060 surplus 77.6236 10 7.7624 lack of fit 57.1648 3 19.0549 F1=6.520 0.0102 error 20.4588 7 2.9227 summation 565.6894 15 According to Table2,regression equation after be reduced on the α=0.10 level of significance except indistinctive item as follow: Y= 77.06250-4.69914X1+3.43848X2-2.31875X12 +4.38125X22 (2) The correlation coefficient between the removal rate of P in the sewage and the diameter as well as the thickness R2= regression quadratic sum /total sum of square =0.8628, showing that the influences of the two factors in this mathematical model on the removal rate of P was about 86.28%, while both the influences of other factors and error occupied 13.72%. 2.4 Effect analysis 2.4.1 Effect analysis for main factors Any factor was fixed at the zero level with “reduction
Conclusion (1) With the theory and method of regression design, the experiment condition was optimized through the DPS data processing system: the diameter was 10.94mm, while the filling thickness was 100.45mm.
Online since: February 2022
Authors: Ghaitaoui Touhami, Tahar Touahri, Arama Fatima Zohra, Laribi Slimane
The physical parameters of the equation governing these characteristics was determined by the effective iteration method using only the information in the data sheet.
The analyzes of the characteristics of these modules, as well as the values of their degradation factors, showed a marked reduction in their performances, in particular, the maximum powers and the form factors.
Fig.3 represented a comparison between the experimental curve and UDTS-50W PV module simulation based on experimental input data (T = 40°C et G=900 w/m²).
PV UDTS-50W modules degradation analysis The evaluation of the degradation requires the external measurements conversion to the STC in accordance with the International Electro-technical Commission Standard (IEC 60891) [12], that is for comparison with the reference data (nominal data) given by the photovoltaic module manufacturer.
The analyzes of the characteristics of these modules, as well as the values of their degradation factors, showed a marked reduction in their performances, in particular, the maximum powers and the form factors.
Fig.3 represented a comparison between the experimental curve and UDTS-50W PV module simulation based on experimental input data (T = 40°C et G=900 w/m²).
PV UDTS-50W modules degradation analysis The evaluation of the degradation requires the external measurements conversion to the STC in accordance with the International Electro-technical Commission Standard (IEC 60891) [12], that is for comparison with the reference data (nominal data) given by the photovoltaic module manufacturer.
Online since: December 2012
Authors: Shang Ming Shi, Liang Zhang, Xiao Xiong Wu, Pan Zhao, Hua Bin Wei, Xue Min Bai
The exploration and utilization of the Hot Dry Rock in the deep of the northern part of Songliao Basin is very important for the energy conservation and emission reductions and the sustainable development of Daqing Oilfield which heat consumption is very higher in oil production.
The oil field produced water is the hot water formed by underground water content of crude oil after de-oil processing, usually temperature for 35 to 42 ℃, is a special type of low-temperature geothermal resources[5].The data show that the Daqing Oilfield is at its later high water-cut period with the oil output water is rising from July 2006 to June 2007.
The data of gravity inversion indicates that the Songliao Basin is one of the thinnest basins in China.
Drilling temperature measurement data in the center of the basin indicates that geothermal gradient within 1000 ~ 2000m depth is 4.8 ℃/100m, when the depth increased to below 2500m depth, the gradient dropped to 3.0 °C/100m, this is mainly due to the increase of depth, the rock density, thermal conductivity and the decrease of porosity.
The oil field produced water is the hot water formed by underground water content of crude oil after de-oil processing, usually temperature for 35 to 42 ℃, is a special type of low-temperature geothermal resources[5].The data show that the Daqing Oilfield is at its later high water-cut period with the oil output water is rising from July 2006 to June 2007.
The data of gravity inversion indicates that the Songliao Basin is one of the thinnest basins in China.
Drilling temperature measurement data in the center of the basin indicates that geothermal gradient within 1000 ~ 2000m depth is 4.8 ℃/100m, when the depth increased to below 2500m depth, the gradient dropped to 3.0 °C/100m, this is mainly due to the increase of depth, the rock density, thermal conductivity and the decrease of porosity.
Online since: March 2009
Authors: Vladimir Eremin, Elena Verbitskaya, Eija Tuominen, Zheng Li, Esa Tuovinen, Jaakko Härkönen, Panja Luukka
We show measurement
data of AC-coupled strip detectors and single pad detectors as well as experimental results of
intentional TD doping.
Data of spatial homogeneity of electrical properties, full depletion voltage and leakage current, is shown and n and p-type devices are compared.
The reduction of the thickness is, therefore, a compromise between the full depletion requirement and the number of electron hole pairs generated in silicon.
The symbols ○,∆ and × are experimental data points for irradiated MCz-Si detectors.
Data of spatial homogeneity of electrical properties, full depletion voltage and leakage current, is shown and n and p-type devices are compared.
The reduction of the thickness is, therefore, a compromise between the full depletion requirement and the number of electron hole pairs generated in silicon.
The symbols ○,∆ and × are experimental data points for irradiated MCz-Si detectors.
Online since: July 2006
Authors: M. Berta, Phil B. Prangnell
The grain sizes have been measured using the mean linear intercept
method parallel and perpendicular to the main direction of alignment of the microstructure and from
the equivalent circular diameter (ECD) after grain reconstruction from the EBSD data.
The ECD data has was also used to determine the width of the grain size distributions from the standard deviation normalised with respect to the distribution average.
Statistical data obtained from the full EBSD maps showing the fraction of HAGB area, mean boundary misorientations, and grain sizes are shown in table 1.
Statistical data for the model alloys determined from the EBSD maps after deformation to a total effective strain of 10 by Route A and BC, using the 120° and 90° dies, for measurements from ~ 5000 grains.
With the statistical data, this is more convincing in the case of the 120° die, but is readily apparent from the much larger retained grain fragments observable in the EBSD maps of the Al-0.2Sc alloy (Figs. 1b & 1d) compared to the single-phase Al-0.13Mg alloy (Figs 1a & 1b).
The ECD data has was also used to determine the width of the grain size distributions from the standard deviation normalised with respect to the distribution average.
Statistical data obtained from the full EBSD maps showing the fraction of HAGB area, mean boundary misorientations, and grain sizes are shown in table 1.
Statistical data for the model alloys determined from the EBSD maps after deformation to a total effective strain of 10 by Route A and BC, using the 120° and 90° dies, for measurements from ~ 5000 grains.
With the statistical data, this is more convincing in the case of the 120° die, but is readily apparent from the much larger retained grain fragments observable in the EBSD maps of the Al-0.2Sc alloy (Figs. 1b & 1d) compared to the single-phase Al-0.13Mg alloy (Figs 1a & 1b).
Online since: December 2012
Authors: Chao Chen, Ding Huang, Kun Wang
On the average, the conversion of intrazonal grassland into cropland led soil organic carbon density (SOCD) decreased from 22.49 kg m-2 to 13.24 kg m-2, and soil total nitrogen density (STND) from 2.23 kg m-2 to 1.27 kg m-2; that is, the meadow conversion resulted in a 41-43% reduction of SOCD and STND in 0–60 cm soil depth over about 20 years.
Data analysis Each variable of the three plots was averaged for statistical analysis.
The decreasing soil quality was due to the enhanced decomposition of organic matter, erosion, as well as a reduction in C input [33,34].
Hence, the conversion of intrazonal grassland into cropland led to the reduction in soil quality in the Bashang area.
Data analysis Each variable of the three plots was averaged for statistical analysis.
The decreasing soil quality was due to the enhanced decomposition of organic matter, erosion, as well as a reduction in C input [33,34].
Hence, the conversion of intrazonal grassland into cropland led to the reduction in soil quality in the Bashang area.
Online since: January 2024
Authors: Danielle Ferreira dos Santos, Anna Cecília Moraes Martuchelli
The concept of recycling and reuse of these materials for use in civil construction can become an interesting solution for the reduction of urban solid waste that would be destined to the formation of large volumes in sanitary landfills.
The authors Mehta and Monteiro [44], discuss the reduction of concrete workability with the addition of any type of fiber, regardless of its type.
Table 2 provides data regarding the permeability test of the specimens when immersed in water.
Leung, An investigation on the performance enhancement and cost reduction of engineered cementitious composites developed with local PVA and PET fibers, Journal of Sustainable Cement-Based Materials. 30 (2022) 1277–1282
The authors Mehta and Monteiro [44], discuss the reduction of concrete workability with the addition of any type of fiber, regardless of its type.
Table 2 provides data regarding the permeability test of the specimens when immersed in water.
Leung, An investigation on the performance enhancement and cost reduction of engineered cementitious composites developed with local PVA and PET fibers, Journal of Sustainable Cement-Based Materials. 30 (2022) 1277–1282
Online since: October 2014
Authors: Jin Yuan, Wen Long Zuo, Xue Mei Liu
According to the data of the related parameters of the spray machine, variables of 3-D model were defined.
Then using excels to deal with the data, and calculating the drift rate and the average velocity component of the deposit droplets which direction is perpendicular to the ground surface.
According to the experiment data, spray particle floating loss rate is significantly higher when the nozzle is located in the upper drift of natural wind than that when the nozzle is located in the downwind.
Data Processing and Results.
CFD prototyping of an air assisted orchard sprayer aimed at drift reduction [J].
Then using excels to deal with the data, and calculating the drift rate and the average velocity component of the deposit droplets which direction is perpendicular to the ground surface.
According to the experiment data, spray particle floating loss rate is significantly higher when the nozzle is located in the upper drift of natural wind than that when the nozzle is located in the downwind.
Data Processing and Results.
CFD prototyping of an air assisted orchard sprayer aimed at drift reduction [J].