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As seen in Fig. 1, elongated grains are observed in the extruded material, which suggests that recrystallization did not occur during or after the hot extrusion.
The vertical and lateral forces Fz and Fy are determined using Eq. 1 when these forces are at a maximum during straight skating: Fy = Fz = X xW/n (1) where, X is the body weight ratio, n is the number of wheels in front or rear positions (= 2), and W is the body weight.

Introduction Zn- Al- Cu alloys are characterized by a number of advantageous properties: low melting point , good castability , high strength and hardness, good fatigue strength, low density, good tribological properties [13-14].
Phase T' is formed both in interdendritic spaces and at grain boundaries.

Pavement Small Test Before The first surface layer with two copies of slurry and prep polymer Sort by production batch, and then sampled in plastic test as well as grain silk into a plastic test according to the on-site environmental conditions.
This method is abroad has a large number of new construction technology, which avoids the defects of particles with a polyurethane adhesive of the surface layer is not stronger, than with conventional processes, it does not easily fall off.

They are characterized by a tight construction of the matrix-aggregate contact zone and the regular shape of grains of artificial aggregates.
In the framework of the research program, two concrete mixtures marked with numbers C-1 and C-2 were made (Table 1).

A simple model for abrasive wear can be demonstrated by using Archard’s equation; V = k1PLH-1 (1) Where, V is volume of material removed by wear (mm3), K1is dimensionless wear coefficient or wear rate, P is applied normal load (N), L is sliding distance (m), and H is Vickers hardness number of the material.
Preferential binder removal with some damage of WC grains was observed for the HVOF coatings in Fig. 3 (a) and (b).

In the initial state this type of catalyst looks like extruded articles from alumina, with a diameter of 1.2 - 1.6 mm, about 5 mm long, with pour grains density of 0.62-0.66 g/cm3, and a specific surface of 200-250 sq.m/g.
The number of the remained carbonaceous deposits, % on the surfaces of the catalyst when annealing in the environment enriched with oxygen Annealing time, [h] Annealing temperature [°С] 500 550 600 650 700 750 1 32.6 13.4 14.2 4.6 0.5 0 2 17.3 14.1 2.8 0.4 0 The process of annealing was carried out at variation of temperature from 500 to 750 °C, isothermal holding was 1 and 2 hours, oxygen was supplied from a cylinder at the rate of 2 l/min.

Considering the concurrent action of the nucleation, diffusional growth, motions of the PPDs and the convections of the matrix liquid, the microstructure evolution may be described by a size distribution function , which is so defined that gives the number of minority phase droplets (PPDs) per unit volume at position and time in a size class from to . obeys the following continuity equation during solidification [11]:
Roven, Dispersion of soft Bi particles and grain refinement of matrix in an Al-Bi alloy by equal channel angular pressing, Int.

The grain size distribution was studied using laser scattering technique (Cilas 1064).
Furthermore, the higher surface area of the smaller particles, for alloy prepared with NbH (C+M), increases the number of bonds among the particles and promotes more efficient solid-state diffusion processes [15].

Introduction Electron beam welding (EBW) has a number of undeniable advantages for application in space environment.
A typical cast weld structure and a fine-grained Fig. 3.

Introduction With the information construction is booming, the major companies and universities, the number of applications running huge, more frequent exchanges between the various application systems, increasingly urgent demand for data exchange.
• Data privileges storage and data access authentication module: Data authority in order to ensure the storage data security and consistency, through the verification of the data permissions restrictions, System can control the fine-grained (field level) control to data access, User role allows only the appropriate permissions to access