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Online since: February 2013
Authors: Fei Chen, Jun Yan Wu, Qiang Shen, Lian Meng Zhang
Introduction As an important member of transparent conducting oxides (TCOs), antimony-doped tin oxide (ATO) has been widely studied not only because of its unique combination of transparency in the visible range and high electric conductivity but also its chemical, mechanical and environmental stabilities [1-4].
The properties of as-synthesized ATO nanoparticles with different citric acid content are given in Table 1.
Properties of ATO nanoparticles with different citric acid content citric acid content in precursor (CA: metal) Sb Content in ATO Nanoparticles [at.%] Particle Size [nm] specific surface area [m2g-1] as determined via EDX as determined via XPS as determined via XRD as determined via TEM 1 3.62 4.43 11.4 5-10 38.4 1.5 6.43 7.02 20.1 10-15 30.1 2 9.73 11.06 26.8 20-25 25.5 3 9.20 14.76 34.9 25-30 20.6 Fig.2 Morphology, size, and Sb content of 10at.% ATO nanoparticles prepared as the citric acid content is CA: metal = 2.
Properties of ATO nanoparticles with different Sb content and same citric acid content Sb content in precursor solution [at.%] Sb Content in ATO Nanoparticles [at.%] Particle Size [nm] Molar ratio of Sb5+ and Sb3+ ( Sb5+/Sb3+) as determined via EDX as determined via XPS as determined via XRD as determined via TEM 1 1.2 0.7 15.6 10-15 1.363 5 5.78 7.02 20.1 15-20 2.35 10 9.73 11.06 26.8 20-25 1.958 15 16.76 17.3 23.4 15-20 1.688 20 21.5 24.5 25.7 20-25 1.293 30 27.82 25 20.4 20-25 1.022 Properties of ATO nanoparticles with different Sb content and citric acid content of CA: metal = 2 is illustrated as Table 2.
The change of particle size has been affected by two factors: (1) With the Sb content increasing, the content of Sb3+ with an ionic radius (0.76Å) larger than Sn4+ (0.69Å) increases, which indicates that the cell parameter of ATO also increases. (2) With the Sb content increasing, the condition around the Sn4+ in the solution changes, which affects the final size of ATO particle.
Online since: October 2007
Authors: Tong Xiang Fan, Cong Fa Zhang, Di Zhang, Wei Cao
Since creep properties are relevant to BLR, an approach to predicting BLR behaviors from creep curves is briefly introduced.
Since creep properties are more readily available than BLR, efforts are made to correlate BLR with creep properties.
The instrumented bolts were calibrated by loading them with a well-defined weight, and the scale factors in the data acquisition program were set in order to record the bolt load signals in Newtons.
Mechanical Model of BLR.Since creep properties are more readily available than BLR, efforts are made to correlate BLR with creep properties.
Several approaches relating bolt-load retention properties to creep behaviors have been proposed by Webster [10] and Arimond [11].
Online since: November 2012
Authors: E.S. Gorkunov
.), as well as to the decohesion of the matrix and inclusions due to a difference in their elastic properties.
Discussion A number of factors have an effect on magnetization reversal.
As was previously shown, magnetization reversal is influenced by a number of factors, which often differ in their effect on the magnetic properties thus making it difficult to estimate the effect of each above-mentioned mechanism on magnetic behaviour.
Malek, A study of the influence of dislocation on some of the magnetic properties of permalloy alloys, Czechosl.
Tanner, The magnetic properties of pearlitic steels as a function of carbon content, J.
Online since: November 2018
Authors: Tomosato Ida, Shin Ichi Furusawa
However, the performance of an ion-conducting device is greatly affected by the physical properties of the ionic conductor.
In particular, since the ionic conduction in the solid occurs by the migration of mobile ions in the crystalline framework, deformation of the crystal when compressive or tensile stress is applied will directly affect performance.
The mechanical error of the X-ray diffractometer was corrected based on the result of XRD measurement of the standard Si powder before and after the XRD measurement of the sample.
(4) Here, the pre-exponential factor σ0 is a function of the carrier number density, charge of the carrier, hopping distance, attempt frequency and correlation factor, and Δ is the activation energy.
The estimated activation energy D and pre-exponential factor σ0 were plotted as a function of the extension ratio (Fig. 8).
Online since: May 2014
Authors: Min Xian Du, Ke Liang Chen, Yong Gang Xiong
Introduction High purity alumina is featured with excellent optical, magnetic, electrical, thermal and mechanical properties [1].
And the core process of this method is the synthesis of ammonium hydroxide carbonate, which will directly affect performance and quality of ultrafine Alumina products and their burning products. 2.4 Activation hydrolysis of high purity aluminum Liu Jianliang et al [13] coldly atomize aluminum to produce active powder, and then with Al-H2O as the action system, activate the hydrolysis reaction and maintain the reaction; the hydrolysis reaction equation is expressed as follows: After calcinations, hydrolyzed products can obtain high-purity ultrafine Al2O3 powders.
However, this method requires a high condition; first, it should choose high-purity aluminum and pure water as raw materials to ensure the purity of the final product, and also requires high-purity aluminum in a high activity state and other limiting factors when using specific activate refining equipment. 2.5 Sol - gel method Chen Zhong et al [14] adopt an organic ligand sol - gel method, add organic ligand and metal ions in aqueous solution to form complexes, and then allow it to make hydrolysis and polymerization by adjusting pH, temperature and other conditions; by the sol - gel method, it can form a spatial structure and then after dehydration and calcination, it can receive the products.
However, the method has higher raw material requirements, for example, raw materials should be 99.996% of fine aluminum and be processed into aluminum foil around 0.1mm; the rate of the reaction process is determined based on the speed of hydrogen spillover, which is greatly influenced by human factors. 2.7 Preparation of fly ash Ji Huiming et al [15] firstly use sodium carbonate as the activator to activate alumina in the fly ash, then elute alumina and control the purity, nucleation and growth process of AL (OH)3by adding the amount and concentration of hydrochloric acid and the pH value of the dissolution, and then after calcination, alumina powder is generated.
Mechanical Engineering Materials, 2006, 03: 44 -47
Online since: December 2006
Authors: Xiao Yuan He, Wei Sun, Xiang Zheng, Meng Nie
From the mechanical point of view there are a few typical elements that usually appear in micro-mechanisms - membranes, beams, comb and flat springs.
The beams are also used to measure material properties of thin films, in particular Young's modulus and residual stress, in conjunction with the electrostatic pull-in technique.
The calibrated factor k is 0.45pixel/µm.
Vibrating shape, Q-factor and resonant frequency of the folded beams are investigated respectively.
Q-factor of the mechanical vibrating system affects the sensitivity and resolution of MEMS gyroscope sensor.
Online since: April 2014
Authors: Qing Fa Chen, Hong Sen Luo
This process is influenced by the long time external disaster-causing factors, but also has its own structure of the mutation process.
If at all hazard factors, environmental factors influence the material field uniform, null zone group structure and geometrical properties of goaf surrounding rock system plays a main role in disaster.
In addition, taking into account the current commercial application of three-dimensional numerical simulation program, mechanical calculation model needs more memory, the software itself has more difficulties in calculation process.
Free area size10m× 10m, empty area center distance 15m, model size is 140m ×140m, grid is divided into140× 140, rock mechanical parameters are shown in table 2.
But affected by several science and technology limited, the full sense of the empty area agglomeration spatial structure effect still need to be further studied.
Online since: March 2015
Authors: Aleksandr E. Volkov, Margarita E. Evard, Fedor S. Belyaev
Modeling of Deformation and Functional Properties of Shape Memory Alloys based on a Microstructural Approach Aleksandr E.
From hypotheses 1 and 2 it follows that the increments dFn  are proportional to ln : dFn = ln dj, (15) where dj is the proportionality factor.
(16) The meaning of this condition is that the micro-plastic flow can occurs then and only then when the generalized force Fnp is equal to the sum of the two opposing factors, one (Fny ) connected with the isotropic hardening and the other (Fnr ) – with the kinematic hardening.
If the applied stress exceeds some characteristic value, the microplastic flow is affected mainly by the small isotropic hardening.
The simulation shows that the vibroisolation properties depend on the phase composition of the SMA, so that the resonance frequency and the payload vibration and acceleration amplitudes are less for the pseudoelastic state with low phase yield stress (Fig. 14a) and for the martensitic state (Fig. 14b) of the SMA rather than for the austenitic state (Fig 14c).
Online since: September 2008
Authors: Jean Pierre Bonino, Daniel Monceau, Céline Viazzi, Richard Wellman, John R. Nicholls, Djar Oquab, Florence Ansart
In both the erosion and the cyclic oxidation tests it was found that the bond coat had a profound affect on the results.
This paper presents the first results concerning the mechanical characterizations of the sol-gel coatings obtained on substrates with different roughnesses.
It also appears as though the bond coat affects the erosion rate, since the sol-gel TBC on the aluminide bond coat is slightly lower that the TBC on the sprayed bond coat.
This means that the bonding of the TBC to the bond coat will play a significant role in the erosion resistance of the coating while the 'bulk' properties will have less of an effect.
This is similar to previous studies on EB PVD TBCs, where the erosion rate increased by a factor of two following aging for 100 h at 1100°C for a standard EB PVD TBC system[5].
Online since: September 2013
Authors: Siti Khadijah Alias, Salmiah Kasolang, Abdul Hakim Abdullah, Syarifah Yunus, Amirul Abd Rashid, Syazuan Abdul Latip
It is thus well known that the deterioration and the breakdown of mechanical systems were mainly caused by seizure or wear of machine elements inside an operating mechanical means [6].
In concern of the AT mechanism, it is highly vital for the wear factor to remain low so that excessive loss of material does not cause shift characteristics of the mechanism to deteriorate [7].
Each wear particle produced is mainly generated with different levels of deterioration of the mechanical components [9].
The factor concerning size estimation and shape observation meanwhile showed that the value of elongation was linearly decreased and no occurrence of irregular shape was observed.
Apparently, it can be anticipated that the occurrence of severe wear particle was insignificant which portrayed both physical and chemical properties of the ATF were not affected throughout this mission profile.
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