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Online since: December 2012
Authors: Wen Da Wu, Yang Liu Li
However the accuracy of on-line DGA results acquired by those on-line equipment needs to be increased, and there is no coherent standard for on-line DGA results [3].As on-line DGA results can be influenced by many factors in which the temperature influence must be considered, for the reason that on-line system is running for the filed tests [4,5].
The transport properties of gases for a plane membrane selected in this work were determined by a nonlinear least-square regression of the exponential growth function [6]: Ci=Cimax[1-exp(-bt)]
These tests were done to establish the permeation transport properties of the membrane and the gas cell, or b which is the slope of the portion of the curve corresponding to the steady-state permeation rate and t99, which is the time taken by each gas to reach 99% of its equilibrium concentration[8].
So, the concentrations of gas need to be re-estimated with many factors.
Conclusions Accuracy of on-line DGA results can be affected by certain circumstance in the filed tests, where temperature, no matter oil temperature or ambient temperature, is a major influencing factor.
Online since: September 2011
Authors: Li Liu, Yue Shun Chen
Statistical Characteristics Analysis of Critical Corrosive Ratio For the factors suffered during service have randomness [9,10], so the durability of the structure is a random process, then use of reliability methods to describe the durability of concrete structures is reasonable.
For the statistical parameters in critical corrosive ratio model (7), its statistical properties can be reflected by standard deviation.
Analysis of Main Factors. (1) Thickness of concrete cover As the protective layer thickness will be affected by the positioning technology of reinforced bar and human operations and other factors, so there are some errors.
Table 1 Concrete mix proportion Cement Sand Gravel Water FDN C20 1 1.9 3.39 0.55 C40 1 1.19 2.53 0.42 0.8% Cement The galvanostatic polarization accelerated corrosion method has been used on reinforced bars corrosion, where the power current density has been set as 0.01mA/mm2, at the same time the bending tensile strain of concrete has been test referring to the mechanical properties test method standards of normal concrete (GB/T50081-2002), and the measured first crack bending tensile strain of C20 and C40 concrete on 28d were 207and 227respectively.
Zheng,Time-Dependent Reliability Method to Assess the Serviceability of Corrosion-Affected Concrete Structures,Journal of Structural Engineering.131(2005)1674-1680
Online since: January 2022
Authors: Jian Xu, Md Azmot Ullah Khan, Naheem Olakunle Adesina
Recently emerged two-dimensional (2D) materials possess distinctive and uncommon properties such as changeable bandgap, layer-dependent mobility, high aspect ratio, quantum confinement due to atomically thin layer [5, 6].
It has the properties of high absorption coefficient, good thermal conductivity, ultrafast photo-response, exceptional carrier mobility, wide absorption range (ultraviolet to infrared), and layer-dependent transparency [12].
The choice of semiconductor material for the solar cell application depends on its properties like bandgap, effective mass, doping level, and fabrication facility.
Simulation Results The photovoltaic properties of our proposed structure have been simulated to assess its performance under light illumination and do further optimization.
Conclusion A numerical method such as NEGF has distinct advantages to calculate and predict the outcome of any emerging devices such as photovoltaic properties of a solar cell at nanoscale dimension.
Online since: June 2010
Authors: Yong Tian Wang, Xia Hui Gui, Jiong Tian Liu, Xiu Xiang Tao, Yi Jun Cao
Introduction Medicaments applied in coal preparation technology are mainly collecting agent and foam beater, and regulators is seldom used, but during the process of high-ash-difficult-to-separate coal slime flotation, carried fine slime is key factor affecting concentrate coal quality.
This thesis, during the study in the laboratory, studies the impact of adding appropriate amount of dispersants on coal flotation based on the special coal quality that mechanical carrying resulting from large content of coal samples slime affecting concentrate coal quality.
Inhibitory effect and synergistic inhibition of cornstarch to silicate minerals are closely related to the chemical properties of mineral crystals.
Exposed surface ion activity, surface electrical properties, surface hydrophobicity after dissociation of silicate minerals with different structures directly affect its absorbtion characteristics on mineral surfaces.
All these mentioned factors causes the result.
Online since: January 2012
Authors: Yoshimasa Funakawa, Kaneharu Okuda, Kazuhiro Seto, Yoshihiko Ono
It is well known that the Hall-Petch coefficient, ky, significantly affects YP through grain refinement, and it is suggested that the segregation of solute carbon in the grain boundary could affect to ky[8,9].
These facts indicate that the grain boundary affects aging behavior in some specific aging conditions and could be one of the essential factors of strain aging, however, its detailed effect and hardening mechanism have not been clarified.
Table1 Mechanical properties of the steel sheets before aging BH:Increase in upperYP after aged at 170oC for 20min against 2%pre-strained stress A.I.
Table1 shows the mechanical properties of the as-received and the subsequently annealed specimens.
Each property of the as-received specimen is the same level to that of commercially produced steels.
Online since: July 2017
Authors: Ion Bogdan Codorean, Eduard Cernat, Stefania Tanase, Dragos Popescu, Alexandru Cirlan, Stefan Mitulescu, Florin Diaconu
They have shown to have a high biocompatibility, but they can not be used due to their rigid geometrical structure and mechanical properties.
Among the growth factors tested were: recombinant human platelet-derived growth factor- AB, hepatocyte growth factor/scatter factor, and bone morphogenic protein-2.
The biomechanical properties of the two artificial menisci have not been fully studied.
The viscoelastic properties in both artificial constructs were different compared with the animal and human samples.
[24] Haut Donahue TL, Hull ML, Rashid MM, Jacobs CR, How the stiffness of meniscal attachments and meniscal material properties affect tibio-femoral contact pressure computed using a validated finite element model of the human knee joint, Journal of biomechanics, 36 (2003), 19-34
Online since: November 2013
Authors: Tuomas Katajarinne, Seppo Kivivuori
The novelty of the present paper is to, first, provide information on the influence of strain induced martensite on the incremental forming process and product properties.
The wall angle affects the amount of generated strain and the speed affects the heating of the specimen.
To investigate the effect of ISF and phase transformation on the tensile properties, a pyramidal test geometry was used.
The flexibility of the ISF process and its ability to form asymmetric parts may realize totally new component designs of materials with enhanced properties.
Improved strength properties required a higher forming force, though the higher martensite amount seemed to degrade the formability of these alloys (lower rupture angle).
Online since: November 2010
Authors: Babak Ebrahimian, Asadollah Noorzad
The mechanical behavior of cohesionless granular soil is described within the framework of micro-polar (Cosserat) continuum and using an elasto-plastic constitutive relation.
The mechanical properties of granular material, density, stress state, dilatancy resistance and surface roughness of structure have significant influence on development of localized shear zones, which in turn will affect the bearing capacity of system [1].
The mechanical behavior of cohesionless granular soil is described using the Lade's single hardening model enhanced by micro-rotations and couple stresses through stress invariants which allow relating the characteristic length to the mean grain size.
(1) where h3 and h4 = balancing factors between couple stress mi and stress σij; and l = characteristic length.
The balancing factors depend on contact distributions of soil grains and are assumed to be unity in the current study.
Online since: February 2015
Authors: Karla Čech Barabaszová, Frantisek Fojtik, Jana Kukutschová, Karel Frydrýšek, Oldřich Učeň, Gűnther Theisz, Vladimír Ječmínek, Vojtěch Bajtek, Kateřina Dědková
About the Verification of External Fixators Applied in Traumatology and Orthopaedics FRYDRÝŠEK Karel1,a, FOJTÍK František1,b, UČEŇ Oldřich2,c, THEISZ Gűnther1,d, JEČMÍNEK Vladimír3,e, BAJTEK Vojtěch1,f, ČECH BARABASZOVÁ Karla4,g,DĚDKOVÁ Kateřina4,h and KUKUTSCHOVÁ Jana4,i 1VŠB – Technical University of Ostrava, Faculty of Mechanical Engineering, Department of Mechanics of Materials, 17. listopadu 15/2172, 708 33 Ostrava, Czech Republic 2VŠB – Technical University of Ostrava, Faculty of Mechanical Engineering, Department of Production Machines and Design, 17. listopadu 15/2172, 708 33 Ostrava, Czech Republic 3Trauma Centre, University Hospital in Ostrava, 17. listopadu 1790, 708 52 Ostrava, Czech Republic 4VŠB – Technical University of Ostrava, Nanotechnology Centre, 17. listopadu 15/2172, 708 33 Ostrava, Czech Republic akarel.frydrysek@vsb.cz, bfrantisek.fojtik@vsb.cz, coldrich.ucen@vsb.cz, dgunther.theisz@vsb.cz, evladimir.jecminek@fno.cz, fvojtech.bajtek@vsb.cz, gkarla.barabaszova
Among the general risk factors we can include possible infections, osteoporosis, rheumatoid arthritis, treatment with corticosteroids, and naturally other diseases which may affect healing processes in patients.
New design (structure) Proper mechanical properties and reliability of structure: Stiffness of fixators, fatigue tests of the whole system, etc. are based on laboratory testing of new smart materials.
Čech Barabaszová, Antibacterial properties of nanostructured materials, Journal of Nanocomposites and Nanoceramics 3 (2012) 7-13
Online since: May 2004
Authors: Y. Karakaş, T. Boyraz, A. Kılıç, B. Ertuğ, O. Addemir, Tolga Tavşanoğlu
A bond structure forms at the metal-ceramic interface by physical, chemical, mechanical and diffusion bonding mechanisms [1-6].
Chemical and mechanical bonding, thermal coefficient of expansion, sand blasting, oxidation, bonding agents, high amount of elements present in the metal and ceramic structures, properties of metal and porcelain powder, sample preparation and firing conditions are the factors that affect the bonding strength at the metal-ceramic interface [7-12].
Experimental This study is for the characterization of the interface properties between metal-porcelain diffusion couple in porcelain teeth.
These bonds may be due to atomic diffusion of the species across the interface, chemical bond between metal and ceramic atoms, chemical reactions that occur at the interface and mechanical interlocking of two parts.
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