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Online since: September 2008
Authors: Satish Nagarajaiah, Jerome P. Lynch, Shirley Dyke, Andrew Smyth, Anil Agrawal, Michael Symans, Erik Johnson
Studies on the correlation between mechanical deformations and electronic properties of single-walled CNTs (SWCNTs) have shown that such materials can be used effectively for strain sensing.
Lynch et al.[16] have observed that the cementitious materials (e.g. fiber reinforced cementitious composites (FRCC)) are semi-conducting materials and they exhibit piezoresistive properties when mechanically loaded.
Principal Component Analysis (PCA) is a multi-variate statistical method that can help to reduce the effect of these factors when identifying structural parameters for damage detection.
This statistically-based analysis has been used to accomodate the effects of environmental factors that affect the behavior of the structure [40].
Wu: Mechanical Systs. and Sgnl.
Online since: October 2010
Authors: C.H. Chen, J.J. Kai, F.R. Chen, Y. Katoh
At the high-temperature environment, both of the mechanical properties and the lifetime of the composites degrade.
Hence the temperature effect is one of the major factors to the bubble formation.
Also, it induces the coarsening of helium bubbles to but decreasing the number density. 3) The excess Si2+ ions may form interstitials and recombine with vacancy clusters, and therefore affect the growth of helium bubbles.
Online since: August 2011
Authors: Xiao Ting Xiao, Hai Yan Zhu, Zhu Heng Zhang
Introduction Polymer rheology which is under stress is produced by elastic,plastic and viscous deformation behavior,it is the relationship with the various factors in the basic polymer forming process parameters,selection and use of raw materials,the best forming process conditions,molding equipment,mold design and improving the quality of products has an important role.Therefore, the relationship between blends rheological-morphology-performance on the preparation of high-performance material blends has a very important role[1].In the rheological properties of polymer materials,the polymer melt viscosity is the most important measure of the flow behavior [2].Because low viscosity resin, then the product will increase the hardness,if hardness increases too larger can lead to products larger brittleness and toughness decreases.At the same time the resin viscosity drops to a certain extent, products will be vulnerable by external forces, leaving the role of stress and others to cost products
viscosity model Most plastic melt is a non-Newtonian fluid,non-Newtonian fluids generally realized as "shear thinning" flow characteristics,namely,the melt shear viscosity increases as shear rate decreased.The accuracy of the viscosity directly affect the injection rate,pressure and time,related to the accuracy of the results of CAE software analysis.Therefore,the viscosity become the most important measure, which is characterized the melt to resist external forces bring in the melt flow and deformation capacity[5].There are three of viscosity model with a representative present:Power law model,Cross-Exp viscosity model,Cross-WLF viscosity equation.
[5] Bingyan Jiang,Jingjing Xu,Lei Xie.Mechanical Science and Technology.
Online since: June 2014
Authors: Frederic de Geuser, Alexis Deschamps, Christopher R. Hutchinson, Seung Won Lee, Zen Ji Horita
In addition, it can be performed in-situ during thermal, and thermo-mechanical treatments.
The context is the study of age-forming process, where combining a forming operation with ageing of the material can drastically reduce the amount of internal stress in the formed part, which is then beneficial for properties such as fatigue resistance and dimensional stability.
It is shown to be larger by a factor of about 6-7 as compared to an un-strained sample aged at the same temperature.
SPD has been shown before to affect strongly precipitation in many ways, but there is a lack of quantitative data on this subject, due to the difficulty to characterize precipitates in a SPD microstructure.
This acceleration factor can therefore be considered to be the one linked to pipe diffusion at the dislocations in this case of dislocation density and temperature.
Online since: March 2024
Authors: Petr Štěpánek, František Girgle, Vojtěch Kostiha, Juraj Lagin
With an increasing bending radius of the rebar, this factor naturally decreases.
This factor results in higher deformations of the element and additional loading of the rebar due to bending moments.
The results confirm the findings from the experimental part of the research, which assert that the anchoring length chosen as 12 times the diameter of the rebar is sufficient and that its increase no longer significantly affects the rebar's tensile strength.
[4] Lagiň, J., Prokeš, J., Girgle, F., Kostiha, V., Vašátko, D., Bezděk, O., Sedláček, O., Štěpánek, P. (2023), The effect of the bent of FRP rebar on its short-term mechanical properties; https://doi.org/DOI:10.1088/1742-6596/2568/1/012006 [5] America Committee Institute. (2012).
Online since: August 2011
Authors: Wolfgang Goes, Franz Schanovsky, Ben Kaczer, Tibor Grasser, Hans Reisinger
Over the last few decades convincing evidence has been collected demonstrating that the oxide reliability is most seriously affected by hole trapping into defects.
This speculation has been supported by a number of similarities in the defect properties [6, 10].
However, it differs from defect to defect, implying that it is related to certain defect properties.
For instance, the McWhorter model [1] extends the SRH approach by a WKB factor in order to account for the tunneling effect.
Defects with this property are held responsible for tRTN.
Online since: November 2012
Authors: Shu Kui Ding
The CBTC system adopted in the Yizhuang line has the independent intellectual property rights, its performance indicators have reached the international advanced level, and has passed the certification of highest security level SIL4 by an internationally independent third party.
"Combined transmission" mode was adopted in the CBTC system of Subway Yizhuang Line.When the train-ground wireless transmission scheme of the signal demonstration project of the Yizhuang metro line was formulated, according to the characteristics of the said wireless transmission technologies and the metro lines, with the purpose of minimizing the external wireless interference effects, the cost factors were comprehensively considered.
Exploratory practice of the three kinds of management concepts Be user demand-oriented to enhance cooperation between "government, enterprises, universities, research institutes and users".The urban rail transit is the technology-intensive industry that relates to the civil, mechanical, electrical, electronics and communications industries, the technology and equipment levels of the urban rail system reflect the national industrialization level.
The company has made the use of the CBTC system core technology that has an independent intellectual property rights, and under the government guidance and user management.
Conclusions The train-ground wireless transmission technology is a key technology to ensure the stable transmission of various data information, video information and control information between the station and the trains, its transmission quality directly affects the normal work of the daily operation and the feeling of the passengers.
Online since: October 2006
Authors: Lih Juann Chen, Wen Wei Wu, C.H. Liu
In most cases, the final properties depend significantly on the size and spatial distribution of clusters.
The backside of the SOI wafer was removed by a mechanical and chemical polishing which stops at the backside of the oxide.
The behavior of fluids at the microscale can differ from macroscopic behavior in that factors such as surface tension and energy dissipation may dominate the system.
The surface structure and interface stability of liquid Au-Si droplets on Si shall affect the shape and movement of the droplets.
Online since: August 2013
Authors: Hua Zhang, Xue Hong Zhang, Yi Nian Zhu, Shou Rui Yuan
The liquid/solid phases were maintained in contact, under mechanical agitation, at ambient temperature for 12 h; (2) The impregnated sample was carbonized/activated in a muffle furnace at 500oC for 4h to get the ZnCl2-impregnated sorbent (GPC, hereafter); (3) After the activation, The products were washed sequentially with 0.1M HCl, hot water and finally cold distilled water to remove residual organic and excess zinc chloride, then dried at 85 ℃ for 12 h.
The increase in metal removal with the adsorbent dosage can be attributed to increased surface area and availability of more adsorption sites [[]Zhao, N.Q.; Wei, N.; Li, J.J.; Qiao, Z.J.; Cui, J.; He, F., Surface properties of chemically modified activated carbons for adsorption rate of Cr (VI).
Previous studies have indicated that the solution pH greatly affected adsorption behavior of heavy metals, because the surface charge density of the adsorbent and the metallic species depend on the pH [[] Selvi, K.; Pattabhi, S.; Kadirvelu, K., Removal of Cr (VI) from aqueous solution by adsorption onto activated carbon.
The essential characteristics of Langmuir isotherm can be expressed in term of a dimensionless parameter RL, also known as the separation factor, which is defined by [13]: RL=1/(1+ KL C0) (5) where KL is the Langmuir constant and Co is the initial Cr(VI) concentration (mg/L).
The correlation coefficients (R2) were found to be 0.9871, 0.9658 and 0.9198 for the adsorption at pH 4.0, 6.0 and 8.0, respectively. 1/n is the heterogeneity factor and can be used as a measure of the deviation from linearity of the adsorption [[]Crini, G., Kinetic, equilibrium studies on the removal of cationic dyes from aqueous solution by adsorption onto a cyclodextrin polymer.
Online since: April 2025
Authors: Anna Ilina, Oksana Chernyakova, Valentyna Ilina
The intensive development of industry and agriculture is accompanied by significant disruptions to the properties of the natural environment.
But at the moment, there is no single methodological support that would take into account the full range of diverse factors that affect the level of comfort of greening facilities in urbanized areas.
Satisfactory – trees are healthy, but with signs of stunted growth, with an unevenly developed crown, few leaves on the branches, minor mechanical damage and small hollows.
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