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Online since: January 2013
Authors: Xing Pin Chen, Xue Chen, Jing Peng Zhang
Pure nickel (99.999%) was cold rolled by a 95% total reduction, and then samples were annealed at 200 °C for 1 hour and quenched for fully recovery, and finally annealed at 600 °C for 1 hour and quenched in water.
Nickel was cold rolled by a 95% total reduction in thickness and subsequently annealed.
Fig. 1 Hardness data for Ni cold-rolled to 95% after annealing at different temperatures for 1 hour Figure 1 shows the micro-hardness changes of pure nickel annealed at various temperatures, ranging from 100 °C to 800 °C.
After 95% rolling reduction, the microstructure of a cold-rolled nickel showed a typical deformed structure, the micro-texture of this material presented a typical copper-type texture (Fig. 2a), and it was easy to develop strong cube texture after annealing.
Compared with sample A, sample B had more low-angle grain boundaries (see Fig. 5), but less Σ3 grain boundaries (see Fig. 6, sample A is 29.7% and sample B is 12.1%), the sharp reduction of Σ3 grain boundary fractions can significantly low the groove depth of the substrates during high-temperature annealing process.
Online since: September 2017
Authors: E.R. Zvereva, O.S. Zueva, R.V. Khabibullina
The reduction in viscosity was observed even at low shear rates, which indicates the absence of extensive spatial structure in the oil heterogeneous system.
Addition of water-based CNT suspensions to water-oil emulsion provide reduction in viscosity only at sufficiently high concentrations of CNT (0.82 wt.%) [10].
The graph shows that the reduction of the dynamic viscosity of the samples is 12-15%.
The reduction in viscosity was observed even at low shear rates, which indicates the absence of extensive spatial structure in the oil heterogeneous system.
Boiler fuel additives for pollution reduction and energy saving, Noyes Data Corp., 1978
Online since: November 2011
Authors: Ying Xian Zhao, Bo Shen
The second order kinetic equation fits experimental data of asphaltene conversion adequately, giving the apparent activation energy to be 144 kJ/mol over the temperature range.
Integrating the Eq.1 gives (2) Fig. 2 shows the above kinetic equation fits the experimental data of asphaltene hydrocracking over NiMo/γ-Al2O3 at various temperatures adequately.
The data of Fig. 4 show that the average molecular weight of liquid product decreased insignificantly at 623 K and rapidly with increasing reaction severity.
Since the bond energy of an alkyl C-S bond is much lower than that of a paraffinic C-C bond [15], only the C-S bonds were split at temperature below 673 K, causing a small reduction of molecular weight of liquid.
The decomposition of asphaltenes were dominated by the scission of the C-C bonds above 673 K, leading to a large reduction of the molecular weight.
Online since: August 2011
Authors: Eann A Patterson, Christopher M Sebastian, Donald Ostberg
These smaller, more manageable data sets are easier to compare quantitatively.
This approach was used because initial work had shown that Tchebichef moments cannot reliably describe the discontinuities in a strain distribution that are associated with complex shapes or boundary conditions; whereas the Fourier transform is ideally suited to such distributions but does not provide any dimensional reduction in the data.
For the experimental data set, this meant the data was reduced from almost 40,000 data points to only 50 Tchebichef moments.
It provides a dimensional reduction in the data from ten of thousands of data points to fifty which allows a practical and straightforward comparison of the data sets; and at the same time preserves the information.
The method was applied to an engineering component employing data from an experiment obtained using digital image correlation and numerical data obtained using finite element analysis.
Online since: September 2014
Authors: Hai Zhou, Jin Lan Bai
With the procedure total rolling force and the distribution of rolling force per width of each pass for HC mill are calculated using sampling data obtained from actual strip rolling.
Comparing the calculation results with actual measured value, it is shown that the calculated total rolling forces are similar to actual data, and the distribution of rolling force per width is consistent with the actual status.
(1) Where, , , where is rolling force, ,are rolling force of plastic and elastic area, ,are enter and exit thickness of strip, is strip width, is influence coefficient of rolling force, is average deformation resistance, is roll flattening radius, is the Poisson ratio of strip, is Young modulus, is friction coefficient, is reduction, , are entry and delivery unit tension, and , are tension influence coefficients.
This is because the reduction at strip edge is larger due to roll bending.
Calculation results shows that calculated total rolling force is close to actual measured data, and the distribution of rolling force per width is consistent with the actual one.
Online since: May 2014
Authors: Shoichiro Yoshihara, Yuki Nakamura, Bryan J. Mac Donald, Emmet Galvin
A method to determine the optimum tightening torque based on experimental data was proposed by F.
The axial force reduction rate increased as the initial axial force increased.
The axial force reduction rate was increased by the crevice corrosion.
The axial force reduction rate increased as the corrosion potential increased.
The average mass loss influenced the reduction rate of the axial force.
Online since: January 2026
Authors: Olena Yavorska, Yevhenii Koroviaka, Taisiia Kaluzhna, Andrii Ihnatov, Olena Dmytruk
This theoretical study evaluates key parameters – pressure, temperature, chemical inhibitors, and geological conditions – using literature data.
Qualitative trend of dissociation rate as a function of pressure reduction, synthesized from literature data Temperature significantly affects degassing through thermal stimulation methods, such as hot water or steam injection.
These models are robust for assessing geological impacts but require extensive input data.
Additionally, literature data vary in quality and context, introducing potential biases.
Sudakova, Assessment of the oil and gas potential of the eastern edge of the northern Ustyurt using new geophysical data, J.
Online since: September 2013
Authors: Guo Yan Yang, Xin Guan, Yan Feng Li
In this paper, we propose a novel location-aware medium access protocol for data intensive wireless sensor networks.
MACA-P introduces a control gap between the RTS-CTS exchange and the subsequent DATA-ACK exchange, which is used for exposed nodes to transmit RTS-CTS and for the alignment of the scheduled DATA frame transmission with the current DATA frame transmission.
To schedule concurrent transmissions, exposed terminals should be identified before the current DATA frame transmission begins.
We suppose that each node has data frame to be constantly sent, i.e. the system is saturated.
ACM Workshop Data Eng[C].Chicago,2006:35-42
Online since: October 2018
Authors: Ruslan R. Safin, Elena A. Beliakova, A.R. Mukhtarova
The obtained data on changes in wood density show that at increasing the average density of the material, there is a reduction in the density of its central layers that is explained by impregnation of the surface layers of wood with wood agent.
The obtained data of changes in the average density of wood (taking into account the impregnation of the treatment agent) and the density of the inner layers of wood (excluding layers impregnated with the treatment agent) allow us to conclude that thermal modification in liquids has a direct influence on the change in wood density (Fig. 3).
The obtained data shows that with increasing treatment temperature and decreasing the density of material there are an increase of flow of volatiles at the stage of vacuum processing, resulting in a lower rate of creation of vacuum in the apparatus and the intensity of the mode of the vacuum system.
The experimental kinetic curves of steam consumption during the cooling process in the dependence on different specific surface of the material (Fig. 5) show that flow of steam is more uniform in character throughout the cooling phase with the reduction of the specific surface of the material.
Conclusion It may be concluded from the researches that: thermal modification of wood in liquids is advisable to apply for hard wood with greater density and smaller impregnation that allows us to reduce the consumption of the treatment agent and to avoid large losses of material during subsequent machining; while simultaneous heating of the liquid and the material placed in it there is the uniform heat treatment over the cross section of the material; the higher the processing temperature, the more intense reduction in the density structure of the material; the steam consumption during the cooling phase of the heat-treated wood increases with increasing specific surface of the material.
Online since: July 2014
Authors: Yan Zhao, Bhatti Imran Shaban
This reduction in mechanical performance must be considered during product design to ensure long-term structure endurance.
The reduction in mechanical properties is often due to degradation at matrix/fiber interface [7,8].
The experimental data was used to carry out the coupled mechanical-diffusion analysis. 2D and 3D models were developed in Abaqus to simulate moisture diffusion from any surface and varying moisture/ temperature conditions.
Similarly for 3D model absorption behaviour is shown in Figure 3, which is in close agreement with simulation results and with the experimental data.
Figure 2 Comparison of 2D Abaqus model with Experimental data having absorption for 112 days Figure 3 Comparison of 2D and 3D Abaqus model with In Figure 4 2D moisture diffusion across depth of specimen is deliberately calculated and shown to compare with classical Fickian diffusion.
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