Search results

Great renewable wastes left after rice production have long been a concern for many researchers all over the world as the source of fibrous materials and a number of chemicals.
The main mineral component of rice production waste (husk, straw), as distinct from other grain crops, is amorphous silica.
IR-spectrum of amorphous silica from rice husk (numbers as per Table 1) Conclusion It was found out that from the black liquor produced from pulping of rice husk may be obtained amorphous silica dioxide of various quality.

The effects of point defect (impurity cluster) and surface defect (grain boundary) have been studied [4-6].
Molecular dynamic analysis In molecular dynamic simulation the motion of a large number of atoms is described by Newton's law: t m i 2 ii ∂ ∂ == r af (1) where f is the force on the atom, m the mass, a the acceleration, r the position of the atom, t the time and i represents the ith atom.
The force fi is calculated by the differentiating the potential function (E), namely i N 21 i ),,,(E r rrr f ∂ ∂ −= L (2) where N is the number of the atoms.

Sand Filling and Pouring Silica sand (SiO2) of grain fineness number (GFN) of 40 to 60 is used as mechanical support to the permeable mould [7].
Improper venting was due to the slurry coating thickness has increased when the number dipping process is repeated.

And the application of AWJ is based on the hypothesis such as time mean and special grain shape, their application is limited in studying the rule of gas-solid-liquid three-phase flow.
Re is the Reynolds number, CD is the drag coefficient, v r, s is the terminal velocity correlation for the solid phase.
In this model, 24 eDf C R= (5) where, f is the value of the drag function, C D is the drag coefficient, Re is the Reynolds number.� Model and Parameters Setting During the process of setting up the model inside and outside the abrasive water jet nozzle, the diameter of high pressure water inlet and abrasive inlet is initialized as 2mm, the diameter of three-phase flow outlet is set as 6mm, and the maximal diameter of mixing tube is 16mm., the exterior size of the nozzle is 50mm in diameter and 100mm in length.

This is because that the high concentration of Ferrite/Bainite, Ferrite/tempered martensite inter-phase boundaries, and grain boundaries can be the preferential sites for crack nucleation and propagation [6].
This is because that microstructure of P110 steel is closely full tempered martensite, and the ferrite also includes much dislocation besides a large number of fine carbide particles, both of them form dimples by the manner of the growth and coalescence of microvoids, which results in appearing of a large number of smaller dimples on the impact fracture surface of P110 steel.

In general, however, carbide distributes inhomogeneously in the grain boundaries and on the dislocations.
On the basis of the wave length, the wave number of the modulated structure, ( 2 )mm  , is obtained.
Following Cahn's spinodal theory [2, 3], the square of the observed wave number, 2 m , decreases linearly with increasing temperature (T) and the temperature at 2 0m  gives the critical temperature (Ts) occurring the spinodal decomposition.

The number of measurement has a positive effect on the finial result, which can improve the measurement precise, however, the number of measurement also increases the measurement time.
And the grain features were readily observed.

The number of cracks had influence to the electrodes’ electricity catalytic activity and corrosion resistance.
The increase of the cracks’ number could enlarge the electrode effective area, and then improved the electrodes’ activity.
The average diameters were obtained by means of the Scherrer equation (d = ka/bcosθ, where β is the line broadening (β=βs–β0, where βs and β0 are the half-widths of the XRD peaks of the sample and of the bulk material), k is related to the crystallite shape (k=0.89), and α and θ are the radiation wavelength and Bragg angle, respectively).The Coating grain size of the Homemade electrode is 5nm by the Scherrer equation.

Introduction The refractory metals and their nitrides were mostly polycrystalline structure, the grain boundary between the polycrystalline was become the rapid diffusion path to Cu atoms.
When the substrate temperature increased, the surface diffusion of the adsorbed particles were increased, the number of the particle nucleation was enhanced, which were speeded up the deposition rate of the film.
While increasing the substrate temperature was also raised the number of surface absorption and bonding capacity, which enhanced the film growth rate.

The conditions input to null the freedom degree of the system were: - Pressure: 1.105 Pa - Temperature: 500-1400°C - Number of mol for the system: 1 - Components: Cr, Nb, Mo and Ti; with the following composition: ________________________________________________________________________________ W(Cr) = 0.1839 W(Fe) = 0.1887 W(Mo) = 3.01e-2 W(Al) = 4.8e-3 W(Ti) = 9.5e-5 W(Co) = 2.3e-3 W(Nb) = 5.05e-2 ______________________________________________________________________________ Figure 1 presents the heat treatment applied on Inconel 718, the high solid solution temperature was chosen to optimize the creep behavior, followed by two aging steps: first at 955ºC and then a second aging step of 720ºC/620ºC, to promote precipitation of additional quantities of γ’ and γ”.
Each line number along the graphics corresponds to a phase or state of matter, as follow: 1-fcc matrix, 2-Ni3Nb, 3-Ni3Ti, 4-Sigma, 5-Liquid, 6-bcc, 7-Phase r Figure 2: Stability of phases over temperature range.
The precipitate is located on the grain boundary.