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Online since: January 2018
Authors: Pavel Sadchikov, Tatyana Zolina
This mathematical model is based on the statistical analysis of earthquake effects and enables to assess the expected damage through comparison the statistical data with initial seismic protection expenditures.
Additional stiffness Reduction in displacement of the nominal design points [%] The part above the crane Side transverse stiffening diaphragms available At the level of crane-supporting girders At cladding level 20% increase not considered 8, 4 1, 9 considered 30, 2 30, 8 1, 5 (half) as much not considered 9, 8 2, 4 considered 36, 3 40, 6 Twice as much not considered 18, 4 4, 9 considered 72, 8 96, 8 The suggested structural solutions enabled to achieve significant reduction in horizontal transverse deformation of frame structures, namely: 1.
These data are approximate to a considerable degree, since at almost all the stages of calculation the authors had to use averaging and assumptions related to peculiar design features.
Additional stiffness Reduction in displacement of the nominal design points [%] The part above the crane Side transverse stiffening diaphragms available At the level of crane-supporting girders At cladding level 20% increase not considered 8, 4 1, 9 considered 30, 2 30, 8 1, 5 (half) as much not considered 9, 8 2, 4 considered 36, 3 40, 6 Twice as much not considered 18, 4 4, 9 considered 72, 8 96, 8 The suggested structural solutions enabled to achieve significant reduction in horizontal transverse deformation of frame structures, namely: 1.
These data are approximate to a considerable degree, since at almost all the stages of calculation the authors had to use averaging and assumptions related to peculiar design features.
Online since: July 2014
Authors: Cong Xin Chen, Kai Zong Xia, Yuan Bin Dong, Ping Lu Huang, Xiu Min Liu
According to the relevant data and field survey, the general golf is about 126800 m2 in Jinghua gypsum mine.
According to survey data, take =24 KN/m3; =1; =27.6Mpa; =40~119m.
Relevant research results show that the strength of saturated gypsum mine will be greatly reduced, softening coefficient is about 0.8, strength reduction factor due to the rheological is 0.66, thus the average long-term safety factor range is from 0.7 to 2.1, the minimum safety factor is 0.4.
Relevant research results show that the strength of saturated gypsum mine will be greatly reduced, softening coefficient is about 0.8, strength reduction factor due to the rheological is 0.66, thus the average long-term safety factor range is from 1.1 to 1.3, the minimum safety factor is 1.0.
According to survey data, take =24 KN/m3; =1; =27.6Mpa; =40~119m.
Relevant research results show that the strength of saturated gypsum mine will be greatly reduced, softening coefficient is about 0.8, strength reduction factor due to the rheological is 0.66, thus the average long-term safety factor range is from 0.7 to 2.1, the minimum safety factor is 0.4.
Relevant research results show that the strength of saturated gypsum mine will be greatly reduced, softening coefficient is about 0.8, strength reduction factor due to the rheological is 0.66, thus the average long-term safety factor range is from 1.1 to 1.3, the minimum safety factor is 1.0.
Online since: July 2014
Authors: Zheng Yi Jiang, Fei Li, Jing Wei Zhao, Meng Yu, Yong Qiang Wang, Ke Zhi Linghu
The performance of the model has been verified by data obtained from a 1850 mm CVC cold rolling mill.
The entry thickness of incoming material is 5.4 mm, exit thickness is 1.96 mm, width is 1246 mm and total reduction is 63.7%.
Table 4 5-pass rolling schedule of 6-high CVC rolling mill No. of pass Entry Thickness (mm) Exit Thickness (mm) Bending of WR (KN) Bending of IMR (KN) Shifting of IMR (mm) Entry Tension (KN) Exit Tension (KN) Reduction Of Pass (%) 1 5.400 4.085 696.1 1267.8 -112.8 242.6 546.5 24.344 2 4.085 3.111 641.6 1169.9 -134.1 546.5 475.7 23.832 3 3.111 2.458 547.8 1171.8 -137.3 475.7 422.7 21.013 4 2.458 2.048 401.2 1159.5 118.75 422.7 404.5 16.657 5 2.048 1.966 2.8 78.2 -142.5 404.5 107.0 2.368 4.1.
The comparison between the simulated results and measured data is shown in Fig. 5.It can be seen that the average absolute error across the transection of the strip between the simulated and measured values is less than 10 µm, and average relative error is less than 1%. 4.3 Control capability of strip profile (quartic and quadratic crown) Fig. 6 show the schematic trans-sectional profile of strip.
The entry thickness of incoming material is 5.4 mm, exit thickness is 1.96 mm, width is 1246 mm and total reduction is 63.7%.
Table 4 5-pass rolling schedule of 6-high CVC rolling mill No. of pass Entry Thickness (mm) Exit Thickness (mm) Bending of WR (KN) Bending of IMR (KN) Shifting of IMR (mm) Entry Tension (KN) Exit Tension (KN) Reduction Of Pass (%) 1 5.400 4.085 696.1 1267.8 -112.8 242.6 546.5 24.344 2 4.085 3.111 641.6 1169.9 -134.1 546.5 475.7 23.832 3 3.111 2.458 547.8 1171.8 -137.3 475.7 422.7 21.013 4 2.458 2.048 401.2 1159.5 118.75 422.7 404.5 16.657 5 2.048 1.966 2.8 78.2 -142.5 404.5 107.0 2.368 4.1.
The comparison between the simulated results and measured data is shown in Fig. 5.It can be seen that the average absolute error across the transection of the strip between the simulated and measured values is less than 10 µm, and average relative error is less than 1%. 4.3 Control capability of strip profile (quartic and quadratic crown) Fig. 6 show the schematic trans-sectional profile of strip.
Online since: September 2016
Authors: Valentina V. Smirnova, Jin Chun Kim, Sergey V. Zmanovskiy, Vadim F. Petrunin, Alexander M. Gromov
The formation of extremely thin protective films is an advantage for preserving maximum content of metallic aluminum through reduction of oxide fraction: in the case of diffusion mechanism, the thickness of protective films amounts to 20–30 nm, and in the case of charge separation, from 2 to 10 nm.
The mass fraction of aluminum in samples was determined by volumetric analysis and calculations using DTA data.
Fig. 3.The XRD patterns of the samples and ASTM data recording According to XRD analysis, the phase composition of powders after holding at different partial pressure of saturated water vapor during 20 days was represented by two crystal phases: residual aluminum and bayerite Al(OH)3 (Fig. 3).
Hence, after receiving the studied aluminum powders, it is necessary to additionally passivate them by thermal treatment or by applying hydrophobic coatings on the surface of particles, which will ensure long storage period without significant reduction of aluminum content in the powders.
The mass fraction of aluminum in samples was determined by volumetric analysis and calculations using DTA data.
Fig. 3.The XRD patterns of the samples and ASTM data recording According to XRD analysis, the phase composition of powders after holding at different partial pressure of saturated water vapor during 20 days was represented by two crystal phases: residual aluminum and bayerite Al(OH)3 (Fig. 3).
Hence, after receiving the studied aluminum powders, it is necessary to additionally passivate them by thermal treatment or by applying hydrophobic coatings on the surface of particles, which will ensure long storage period without significant reduction of aluminum content in the powders.
Online since: August 2014
Authors: Bogdan Szybiński, Paweł Romanowicz
For such set of data the plane model (plane strain state assumption is used, which corresponds to the cross section of tube with the infinite length) of the symmetric quadrant of the cross section of the rectangle is proposed and the optimal value of is searched using the approach described in the last two sentences of the previous section.
On the base of the geometrical data and the results obtained for 2D model the 3D finite element model was created, which is shown in Fig. 3b and Fig. 3c.
Further, rather small reduction of the stress concentration was observed (Fig. 5b and Fig. 5c).
Further reduction of the stress concentration was observed.
On the base of the geometrical data and the results obtained for 2D model the 3D finite element model was created, which is shown in Fig. 3b and Fig. 3c.
Further, rather small reduction of the stress concentration was observed (Fig. 5b and Fig. 5c).
Further reduction of the stress concentration was observed.
Online since: October 2011
Authors: Yi Zhu, Li Fa Wang, Xi De Lai
Results show that the guide bearing stiffness has a significant impact on the lateral vibration characteristics of the location of the unit, which provides a reference for the reduction of vibration and the optimization of the supporting structure of the turbine unit.
Large-scale hydro-generating units are generally rigid design, and because the hydro-generating set operating speed and runaway speed is relatively low, generally lower than the first-order natural frequency of transverse vibration, and from the data in Tables 1 to 4, we can get the first-order natural frequency of transverse vibration and the relationship between the guide bearing stiffness curves in Figure 5.
Since the vibration displacement of exciter, with the reduction of the bearing stiffness, reduced first, and then increased, it explains that when the up-turbine guide bearing stiffness is too large, and it has a negative impact of the reduction of exciter’s vibration.
According to the data in Table 1 and 4, the value of the up-turbine guide bearing stiffness must be carefully chosen.
Large-scale hydro-generating units are generally rigid design, and because the hydro-generating set operating speed and runaway speed is relatively low, generally lower than the first-order natural frequency of transverse vibration, and from the data in Tables 1 to 4, we can get the first-order natural frequency of transverse vibration and the relationship between the guide bearing stiffness curves in Figure 5.
Since the vibration displacement of exciter, with the reduction of the bearing stiffness, reduced first, and then increased, it explains that when the up-turbine guide bearing stiffness is too large, and it has a negative impact of the reduction of exciter’s vibration.
According to the data in Table 1 and 4, the value of the up-turbine guide bearing stiffness must be carefully chosen.
Online since: February 2012
Authors: Xing Wang Chai, Dong Hui Chen, Yun Hai Ma, Bao Gang Wang, Xin Lu, Hong Xia Guo
In this paper, soil parameters and the collected data were tested and processed, and the changing trends of force with drilling depth were obtained and the maximum force applying to the working components was picked up.
Among all the extrusion heads, the vertical concave head showed the most obvious friction reduction effect, and the resistance reduced 17%.
The six bionic extruding head (upright convex shape, upright concave, concave unsmoothed, horizontal convex, horizontal concave and diagonal concave) compared with common extruding head, and the collected data were processed, the changing trends of force with drilling depth were obtained and the maximum force applying to the working components was picked up.
Among all the extrusion heads, the vertical concave head showed the most obvious friction reduction effect, and the resistance reduced 17%.
The six bionic extruding head (upright convex shape, upright concave, concave unsmoothed, horizontal convex, horizontal concave and diagonal concave) compared with common extruding head, and the collected data were processed, the changing trends of force with drilling depth were obtained and the maximum force applying to the working components was picked up.
Online since: December 2014
Authors: Rong Zhao
Data were collected from 299 university students, and the relationships between the scaffolding and the sense of community were examined by path analysis.
As to the features of scaffolding, McKenzie [5] advocated step-by-step directions, clarification of the purpose, focus on the question, sortation of information, models, indication of worthy sources, reduction of uncertainty, and channeling & focusing.
Analysis and Results In the research, SmartPLS version 2.0 was chosen for data analysis.
As to the features of scaffolding, McKenzie [5] advocated step-by-step directions, clarification of the purpose, focus on the question, sortation of information, models, indication of worthy sources, reduction of uncertainty, and channeling & focusing.
Analysis and Results In the research, SmartPLS version 2.0 was chosen for data analysis.
Online since: January 2014
Authors: Jozef Beňo, Marek Vrabel', Jozef Stahovec
It is commonly recognized that success of the products innovation depends on the reduction of product life cycle.
Five single measured lengths were used as Max–rule to evaluate roughness data by ISO 4288.
On the other hand, measured roughness data often showed lack of statistical normality.
In order to eliminate that effect, the so called Box−Cox power transformation with the optimum lambda λ has been used for the measured data as solution in MiniTab software.
Basic comparison of the milling strategies results from effect of the side step ae whereas the range of the measured data are shown in the Table 1.
Five single measured lengths were used as Max–rule to evaluate roughness data by ISO 4288.
On the other hand, measured roughness data often showed lack of statistical normality.
In order to eliminate that effect, the so called Box−Cox power transformation with the optimum lambda λ has been used for the measured data as solution in MiniTab software.
Basic comparison of the milling strategies results from effect of the side step ae whereas the range of the measured data are shown in the Table 1.
Online since: July 2017
Authors: Carlos Henrique Ataíde, Tiago José Pires de Oliveira, Wender Santana Carvalho, José Alair Santana Jr.
Therefore, analytical pyrolysis of biomass may provide useful data to improve the characteristics of bio-oil [5].
The reduction in oxygen content improves the stability of bio-oil and increases its heating value.
The data were processed based on the compounds in the NIST 05 library.
For tests at 650°C there was a reduction in formation of phenolic compounds and an increase in formation of hydrocarbons, such as 1,3-Butadiene, 2-methyl- (21,92%).
With the increase in pyrolysis temperature of sample 2 there was a reduction in formation of phenolic compounds and an increase in formation of hydrocarbons and acid compounds.
The reduction in oxygen content improves the stability of bio-oil and increases its heating value.
The data were processed based on the compounds in the NIST 05 library.
For tests at 650°C there was a reduction in formation of phenolic compounds and an increase in formation of hydrocarbons, such as 1,3-Butadiene, 2-methyl- (21,92%).
With the increase in pyrolysis temperature of sample 2 there was a reduction in formation of phenolic compounds and an increase in formation of hydrocarbons and acid compounds.