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Online since: May 2007
Authors: Yun Lai Deng, Qi Ping Hu, Yong Zhang
Deformation microstructures and micro-orientations of columnar grains with different
orientations in a polycrystalline high purity Al cold-rolled up to 65% (thickness reduction) were
investigated using electron backscatter diffraction (EBSD) technique.
The deformation was carried out to a total engineering reduction of 65% (r = 65% ) at room temperature using an irreversible mill with two φ130 × 400 mm rollers.
Orientation mapping involving automatic beam scanning was used with step sizes of 1-3 µm, Orientations of the pixels were represented using three Euler angles (ϕ1, φ, ϕ2) of Bunge's notation system, orientation data analysis was performed using OIM analysis for windows.
Orientation maps from EBSD data are shown in Fig.2.It can be seen that the boundaries with 5~15 deg angles and greater than 15 deg angles were imposed using fine and coarse lines, respectively.
Fig2.a shows the region remote from prior boundary (inner part) in grin GA, Fig2.b displays the transition zone from grain GA to GB except the inner part of grain GB, and Fig2.c consists of the inner part of grain GC and the transition zone from grain GB to GC, representing the differences in respect of grain subdivisions of the three investigated grains after a total thickness reduction of 65%.
The deformation was carried out to a total engineering reduction of 65% (r = 65% ) at room temperature using an irreversible mill with two φ130 × 400 mm rollers.
Orientation mapping involving automatic beam scanning was used with step sizes of 1-3 µm, Orientations of the pixels were represented using three Euler angles (ϕ1, φ, ϕ2) of Bunge's notation system, orientation data analysis was performed using OIM analysis for windows.
Orientation maps from EBSD data are shown in Fig.2.It can be seen that the boundaries with 5~15 deg angles and greater than 15 deg angles were imposed using fine and coarse lines, respectively.
Fig2.a shows the region remote from prior boundary (inner part) in grin GA, Fig2.b displays the transition zone from grain GA to GB except the inner part of grain GB, and Fig2.c consists of the inner part of grain GC and the transition zone from grain GB to GC, representing the differences in respect of grain subdivisions of the three investigated grains after a total thickness reduction of 65%.
Online since: April 2015
Authors: Yoki Yulizar, Harjono Harjono
The TEM Image that was shown in Fig. 1 corresponds to their particle size distribution data of AgNPs at different periods of irradiation time in Fig. 4.
Data from the PSA measurement showed that the synthesis of silver nanoparticles by microwave irradiation of more than 210 seconds tend to produce large-sized silver nanoparticles presumably due to the agglomeration process.
Dimensional data of synthesized AgNPs measured by Particle Size Analyzer (PSA) Irradiation times (s) Dx10 (nm) Dx50 (nm) Dx90 (nm) D[4,3] (nm) 145 13.8 24.5 46.6 40.8 180 13.8 24.7 47.1 28.0 210 13.1 22.2 42.9 25.5 215 14.5 27.5 55.1 31.6 240 13.7 24.3 46.0 41.2 Based on data on Fig. 4, Table 1 provides further information about the size of silver nanoparticles based on data from Particle Size Analyzer (PSA).
All the data showed a relative narrow size in all parameters of PSA, indicating the existence of AgNPs with well controlled size.
These results are consistent with the data shown in the UV-vis spectra in Fig. 1 that the optimum absorbance value (2.61) is achieved at a maximum wavelength 419 nm.
Data from the PSA measurement showed that the synthesis of silver nanoparticles by microwave irradiation of more than 210 seconds tend to produce large-sized silver nanoparticles presumably due to the agglomeration process.
Dimensional data of synthesized AgNPs measured by Particle Size Analyzer (PSA) Irradiation times (s) Dx10 (nm) Dx50 (nm) Dx90 (nm) D[4,3] (nm) 145 13.8 24.5 46.6 40.8 180 13.8 24.7 47.1 28.0 210 13.1 22.2 42.9 25.5 215 14.5 27.5 55.1 31.6 240 13.7 24.3 46.0 41.2 Based on data on Fig. 4, Table 1 provides further information about the size of silver nanoparticles based on data from Particle Size Analyzer (PSA).
All the data showed a relative narrow size in all parameters of PSA, indicating the existence of AgNPs with well controlled size.
These results are consistent with the data shown in the UV-vis spectra in Fig. 1 that the optimum absorbance value (2.61) is achieved at a maximum wavelength 419 nm.
Online since: October 2008
Authors: Masanobu Kamitakahara, Ikuho Yonezawa, Koji Ioku, Tohru Ikeda, Takatoshi Okuda, Yoshinori Gonda, Yasuaki Shibata, Hisashi Kurosawa, Giichiro Kawachi
These data suggested that the spherical β-TCP
granules stimulated osteogenesis and osteoclast activity of the unloaded bone.
In this study, we analyzed osteoconductivity and bioresorbability of spherical β-TCP granules composed of rod-shaped particles in the bone with reduction in osteogenic potential induced by mechanical unloading [5].
In the operated right femur, regeneration of the non-critical sized bone defect in the unloaded bone was apparently delayed compared to the loaded bone (data not shown).
Greater numbers of tartrate-resistant acid phosphatase-positive cells were present around the implant than those in the other portions of the bone and in the control bone (data not shown).
These data suggested that the spherical β-TCP granules stimulated osteogenesis and osteoclast activity in the unloaded bone.
In this study, we analyzed osteoconductivity and bioresorbability of spherical β-TCP granules composed of rod-shaped particles in the bone with reduction in osteogenic potential induced by mechanical unloading [5].
In the operated right femur, regeneration of the non-critical sized bone defect in the unloaded bone was apparently delayed compared to the loaded bone (data not shown).
Greater numbers of tartrate-resistant acid phosphatase-positive cells were present around the implant than those in the other portions of the bone and in the control bone (data not shown).
These data suggested that the spherical β-TCP granules stimulated osteogenesis and osteoclast activity in the unloaded bone.
Online since: June 2013
Authors: Jie Huang, Kai Chai, Mei Jun Zhang, Hao Chen
Acquisition bearing 4 typical state of vibration signal of a total of 400 group sample data respectively is normal, ball fault, inner circle fault and outer ring fault.
Random each state of 50 groups sample data is in this study.
Fig.1 Bearing time domain waveform Fig.2 The time domain waveform after noise reduction Improved EEMD threshold noise reduction.In order to improve classification accuracy of combination improve EEMD with SVM,Signal threshold noise reduction by the improved EEMD outstands sample characteristics and eliminate random noise interference, Fig.2 is bearing 4 typical state of time domain waveform after signal noise reduction.
The 20 group sample data from four state in random each sample constitute training set.The 80 group training sample in all and9Dcharacteristic vector show in fig.6.
Advances in Adaptive Data Analysis, Vol.1(2009),p1-41 [4] M.J.
Random each state of 50 groups sample data is in this study.
Fig.1 Bearing time domain waveform Fig.2 The time domain waveform after noise reduction Improved EEMD threshold noise reduction.In order to improve classification accuracy of combination improve EEMD with SVM,Signal threshold noise reduction by the improved EEMD outstands sample characteristics and eliminate random noise interference, Fig.2 is bearing 4 typical state of time domain waveform after signal noise reduction.
The 20 group sample data from four state in random each sample constitute training set.The 80 group training sample in all and9Dcharacteristic vector show in fig.6.
Advances in Adaptive Data Analysis, Vol.1(2009),p1-41 [4] M.J.
Online since: October 2011
Authors: Jing Sheng Qiao, Wei Hua Ma, Qing Juan Meng
In order to reduce the noise affect in the process of the dynamic strain gauge collecting, respectively deal the measurement data with the low-pass filter.
In the paper, the data except in special indicate, all is conversed based on similarity ratio.
隔振沟两侧0.1米处布设加速度传感器 模拟隔振沟宽2.5米,长5米,深度分别为2.5米,3.75米,5米, 距夯击点12.5米,隔振沟两侧2.5米处布设压力传感器和加速度传感器 Vibration isolation ditch 0.1 meters wide, 0.2 meters long, 0.1m deep, filling with the mixture of sand and stone, 0.5 m from tamping point, acceleration sensors placed in isolation ditch of 0.1 meters on both sides. 0.5m米 0.5m米 0.5m米 Tamping point 0.5m米 1004 1006 1005 1007 1008 1009 1010 1011 acceleration sensor Figure 2 Vibration isolation ditch arrangement Test results and analysis The horizontal acceleration transfer law under different ramming energy The acceleration schedule of each point was measured in the test, by means of picking the maximum point of the acceleration schedule, the relevant data was obtained in table 2.
According to the model test data, Considering the level distance for tamping point and ramming energy two factors , the horizontal acceleration attenuation formula was fitted as follow: (1) Where a—the horizontal vibration acceleration, g.
(2) the vibration reduction effect of vibration isolation ditch is obvious, the deeper the vibration isolation ditch vibration reduction effect the more obvious, and in the guarantee vibration isolation ditch don't collapse, the vibration reduction effect of ditch full of sand and stone mixture is less than no filling.
In the paper, the data except in special indicate, all is conversed based on similarity ratio.
隔振沟两侧0.1米处布设加速度传感器 模拟隔振沟宽2.5米,长5米,深度分别为2.5米,3.75米,5米, 距夯击点12.5米,隔振沟两侧2.5米处布设压力传感器和加速度传感器 Vibration isolation ditch 0.1 meters wide, 0.2 meters long, 0.1m deep, filling with the mixture of sand and stone, 0.5 m from tamping point, acceleration sensors placed in isolation ditch of 0.1 meters on both sides. 0.5m米 0.5m米 0.5m米 Tamping point 0.5m米 1004 1006 1005 1007 1008 1009 1010 1011 acceleration sensor Figure 2 Vibration isolation ditch arrangement Test results and analysis The horizontal acceleration transfer law under different ramming energy The acceleration schedule of each point was measured in the test, by means of picking the maximum point of the acceleration schedule, the relevant data was obtained in table 2.
According to the model test data, Considering the level distance for tamping point and ramming energy two factors , the horizontal acceleration attenuation formula was fitted as follow: (1) Where a—the horizontal vibration acceleration, g.
(2) the vibration reduction effect of vibration isolation ditch is obvious, the deeper the vibration isolation ditch vibration reduction effect the more obvious, and in the guarantee vibration isolation ditch don't collapse, the vibration reduction effect of ditch full of sand and stone mixture is less than no filling.
Online since: September 2007
Authors: Lj. Milovanović, S. Milovanović, A. Šaponjić, Dj. Kosanović
The carbothermic reduction reactions proceed in three steps:
4 H3BO3 ⇒ 2 B2O3 + 6 H2O (1)
B2O3 + 3 CO ⇒ 2 B + 3 CO2 (2)
4 B + C ⇒ B4C (3)
Step 2, reduction of B2O3 with CO becomes thermodynamically feasible above 1400°C [7],
however, the reduction temperature needs to be maintained beyond 2000 °C to achieve an enhanced
rate of reduction accompanied by the formation of B4C in the third step [8].
The starting structural model for the rhombohedral crystal system was built with crystallographic data with space group: R -3 m, reported by Kwei and Morosin [9].
Fig. 5 Structural refinement patterns of boron carbide using X-ray powder diffraction data based on the rhombohedral phase.
Tick marks above the difference data indicate the reflection position.
Table 2 Structural parameters for boron carbide obtained from structural refinement using X-ray powder diffraction data at room temperature.
The starting structural model for the rhombohedral crystal system was built with crystallographic data with space group: R -3 m, reported by Kwei and Morosin [9].
Fig. 5 Structural refinement patterns of boron carbide using X-ray powder diffraction data based on the rhombohedral phase.
Tick marks above the difference data indicate the reflection position.
Table 2 Structural parameters for boron carbide obtained from structural refinement using X-ray powder diffraction data at room temperature.
Online since: October 2010
Authors: Natalya Mukhina, Boris Tsarev, Nikolai Zhuravlev, Elena V. Zabolotskaya, Dina G. Kellerman, Vadim Gorshkov
Samples were highly porous (about 40%) to ensure their efficient reduction with hydrogen.
Therefore, measured data are not absolute and are understated in comparison with that for ideal nonporous samples.
The analysis of TG data shows, that a decomposition of ammonia vanadate at temperature about 180 ºC is the first stage of process (in normal NH4VO3 melts with a decomposition at 200 ºC).
Fitting the data in terms of a Curie–Weiss law yields a Curie constant C= 4.43 emu K mol−1, a Weiss temperature Θ = −81 K and an effective moment μ=5.95 μB.
As an example the data for the case of x=0.1 are plotted in the Fig. 5.
Therefore, measured data are not absolute and are understated in comparison with that for ideal nonporous samples.
The analysis of TG data shows, that a decomposition of ammonia vanadate at temperature about 180 ºC is the first stage of process (in normal NH4VO3 melts with a decomposition at 200 ºC).
Fitting the data in terms of a Curie–Weiss law yields a Curie constant C= 4.43 emu K mol−1, a Weiss temperature Θ = −81 K and an effective moment μ=5.95 μB.
As an example the data for the case of x=0.1 are plotted in the Fig. 5.
Online since: December 2025
Authors: Daniel E. Green, Yang Song, Si Chang Xu, Leo Kiawi, Gary Rankin, Eugene Ryzer
For the tested sample without fracture, thickness reduction is measured in the middle section of the specimen gauge.
An appropriate design of SFO can only be achieved by using material data from the first experiment and numerical estimations of gas pressurization.
However, the pressure oscillation inside each forming cavity could not be measured in the experiment due to the sensor uncertainties associated with the measurement range and the logging interval limitation of the data acquisition system.
The collected forming pressure data can be seen as a lowpass-filtered mean pressure that is increased without oscillation.
A suitable solution will be developed in future experiments to obtain oscillating pressure data during the GO-SPF process.
An appropriate design of SFO can only be achieved by using material data from the first experiment and numerical estimations of gas pressurization.
However, the pressure oscillation inside each forming cavity could not be measured in the experiment due to the sensor uncertainties associated with the measurement range and the logging interval limitation of the data acquisition system.
The collected forming pressure data can be seen as a lowpass-filtered mean pressure that is increased without oscillation.
A suitable solution will be developed in future experiments to obtain oscillating pressure data during the GO-SPF process.
Online since: July 2013
Authors: Duchek Michal, Kubina Tomas, Konopik Pavel
Data from plastometer tests were converted into a model compatible with the DEFORM simulation software.
Comparison between Experimental and Numerical Simulation Data Flow stress data obtained from the experimental measurement can be assessed by means of simulation.
The data can be adapted for FEM-simulation in DEFORM 2D software.
The specimen dimension and reduction in height was also equal to the test data.
The key is to obtain the accurate flow stress data that properly describes the material’s behaviour.
Comparison between Experimental and Numerical Simulation Data Flow stress data obtained from the experimental measurement can be assessed by means of simulation.
The data can be adapted for FEM-simulation in DEFORM 2D software.
The specimen dimension and reduction in height was also equal to the test data.
The key is to obtain the accurate flow stress data that properly describes the material’s behaviour.
Online since: February 2013
Authors: Hai Quan Su, Shang Hong Zeng, Ning Ding, Tian Jia Chen, Shi Yong Yu, Feng Hua Bai
The reduction profiles were collected in the 5% H2/N2 gas mixture from room temperature to 800 °C.
In all cases, the data were detected after a 16 h steady process.
TPR measurements Pure Co3O4 generally presented the reduction peaks in the range of 257-362oC and 362-512 oC, respectively, corresponding to the reduction of Co3O4 to CoO and CoO to Co [13, 14].
The reduction peaks at 287 oC and 339 oC corresponded to the two-step reduction of Co3O4, and the wide and diffuse reduction peak at 467oC was attributed to the reduction of cobalt species, which was formed via the strong interaction between active component and support.
Catalytic performance The catalytic activity of Co/ZrO2-Al2O3 catalysts was investigated in a fixed-bed reactor and the data were recorded after a 16 h steady process.
In all cases, the data were detected after a 16 h steady process.
TPR measurements Pure Co3O4 generally presented the reduction peaks in the range of 257-362oC and 362-512 oC, respectively, corresponding to the reduction of Co3O4 to CoO and CoO to Co [13, 14].
The reduction peaks at 287 oC and 339 oC corresponded to the two-step reduction of Co3O4, and the wide and diffuse reduction peak at 467oC was attributed to the reduction of cobalt species, which was formed via the strong interaction between active component and support.
Catalytic performance The catalytic activity of Co/ZrO2-Al2O3 catalysts was investigated in a fixed-bed reactor and the data were recorded after a 16 h steady process.