Search results

Electronically graphene shows unusual properties.
Most of these properties stem from the electronic band structure of graphene.
Since these layers share many of the same physical properties as graphene obtained by mechanical exfoliation of highly oriented pyrolitic graphite (HOPG) they are aptly referred to as epitaxial graphene.
In view of this, we performed a comparative investigation of electrical properties of the graphene/4H-SiC(0001) interface and its subsequent effect on the local transport properties in graphene.
Results and discussion Electrical properties of the graphene/4H-SiC(0001) interface.

The structural design of nozzle in outer mixing mode for preparing superfine particles by SCF technology Yan Liu 1,2,a, Yanpeng Qu1,2,b, and Weiqiang Wang1,2,c 1School of Mechanical Engineering, Shandong University, Jinan, China , 250061 2Shanda-Lunan Research Institute of Supercritical Fluid Technology, Shandong University, Jinan, China , 250061 aliuyan_2006@sdu.edu.cn, bdania_QYP@sdu.edu.cn, cWqwang@sdu.edu.cn Keywords:Nozzle, Supercritical fluid, Micro-particle, Numerical simulation Abstract.
The numerical simulation of the flow field through the nozzle The parameters change of the flow and state through the nozzle is a key factor to affect the formation of every superfine particles.
Geometry model of primary nozzle Boundary conditions and relevant process parameters. we use Fluent v. 6.2 to accomplish the simulations , and should set the correct boundary conditions ,then need input the physical properties of fluids and some flow parameters.
The physical properties of materials are inputted such as density of solution, specific heat, viscosity, thermal conductivity.
The two streams we use in the simulation are supercritical CO2 and acetone solution, as the solute content in solution is relatively slight in the practical experiments, we ignore the solute's influence to the properties of solution.

Possible causes: opening rate is an important factor affecting the pressure of the distribution plate and determining the fluid distribution.
Moreover, the catalytic properties of the fixed-bed process decrease rapidly.
Microstructure, properties and temperature evolution of electro-pulsing treated functionally graded Ti–6Al–4V alloy strip, J.
Effect of electropulsing treatment on the microstructure,texture and mechanical properties of cold-rolled Ti–6Al–4V alloy, J.

Introduction Ceramics is an important group of engineering materials because it has high hardness, thermal stability and corrosion resistant properties.
The microstructure and properties of composites depend on the parameters of processing, especially temperature and atmosphere of sintering is considered important.
Both of them affect the formation of a new product due to formation of a spinel phase.
In composites with alumina matrix existence of spinel phase influence the mechanical properties, especially can affect the crack propagation and change the fracture toughness [6-8].
The factor that may control the formation of spinel phase is the partial pressure of oxygen during the sintering process [9] and even can eventually reduce it back to nickel [10].

Structure and Properties of Boride Coatings Synthesized from Thermo-reactive Powders during Electron-beam Surfacing N.K.
The physico-mechanical properties of the coatings can vary in a wide range depending on the proportion and sizes of initial components in the fused mixture.
The degree of the melt mixing depends on many factors, including the size of initial components.
Obviously, changes in the granulometric composition of the fused powder would greatly affect the crystallization rate and completeness of phase transformations at electron beam surfacing, thus defining the microstructure, phase composition and service properties of deposited coating.
The lubricant application in the friction zone greatly enhanced the tribological properties of all the coatings.

But some complex optical-electro-mechanical systems are required to separate the monochromatic radiation energies of two wavelengths from the same radiation signal [8].
The correction factors in Eq. (2) relate to grating efficiency and losses in the fiber-optic cable and are derived from calibration using the blackbody furnace detailed below.
(ii) Get the corrected radiation intensity profile according to the correction factor discussed below.
(iv) Determine the wavelength range that meets the gray property from the emissivity profile.
The characteristic correction profiles at the different temperatures are consistent with each other, so the characteristic correction factors are independent of temperature.

Residual stresses affect the fatigue behavior of machined components by changing the mean stress and stress amplitude.
Thermal residual stress-relaxation is not only affected by the applied annealing temperature and time, the residual stress state itself, but also by the material properties [7].
On the other hand, the larger compressive residual stresses reveal that most of the mechanical-induced compressive residual stresses remain after 3000 h thermal exposure.
It shows that the thermal exposure has slight effect on relaxing the compressive residual stresses produced by the mechanical impact during the broaching.
Vohringer, Relaxation of residual stresses by annealing or mechanical treatment, Pergamon Press, Adv.

At present, various models are used to determine the shear moduli of unidirectional and layered CMs from the properties of reinforcement, binder, their volume content, and the location of reinforcing fibers in them [1-5].
Experimental studies were first carried out on steel beams, because their characteristics have been well investigated and reliable methods for determining their shear properties are known.
The latter, as shown above, is also determined by a combination of other factors (see Tables 1, 2).
All the methods considered are based on the fact that the main factor influencing the deflection is the transverse force, which affects the rotation angle of specimen cross sections.
Hill: Theory of mechanical properties of fibre-strengthened materials.

Abstract: Industrial applications of titanium alloys especially in aerospace, marine and offshore industries have grown significantly over the years primarily due to their high strength, light weight as well as good fatigue and corrosion-resistance properties.
The material properties defined for the cutting tool were those of tungsten carbide; the tool was discretized with 23440, 4-noded tetrahedral elements with approx. 5500 nodes belonging to element in the region with a high mesh density in the tool tip-workpiece contact area (Figure 2).
The material properties of the modelled alloy are E = 87 GPa, ν = 0.3, ρ = 4900 kg/m3, where E, ν and ρ are the Young’s modulus, Poisson's ratio and density of the material, respectively.
However, a further increase in the amplitude from 30 µm to 40 µm did not affect the cutting forces significantly causing only a 2% reduction in cutting forces. 3.3 Effect of Vibration Frequency.
The temperature in UAT is higher then in CT, the possible causes for this are the effect of the additional factor linked to dissipation of the vibration energy [6].

King [7] continued to highlight that, in correlation with age, the bodily area most strongly affected by discomfort are the joints.
Although softer floors provide less muscle fatigue and more comfort especially for lower back and other lower extremities, it should be noted that floor material that is too soft could also affects the level of standing stability, hence, may increase muscle demands [9].
Prat founded that viscoelastic material for shoe in-soles had been found to have the best long-term ability to maintain a cushioning effect since the material’s shock attenuating properties performed well after 1 year of usage [19].
Kroemer-Elbert, Engineering Physiology: Bases of Human Factors/Ergonomics, Von Nistrand Reinhold (second edition), 1990
Chaffin, Influence of flooring on standing fatigue, Human Factors 37 (3) (1995) 570-581, cited in J.