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The high temperature strength and enhanced resistance to grain growth of dispersion-strengthened copper composite could provide spot welding electrodes with longer lifetime [1].
Results & discussion Composite Properties Fig. 1 shows the typical microstructure of compacts forged at different pressures, which clearly indicates the effectiveness of increasing forging pressure in reducing the thickness of oxide layer at the copper grain boundaries.
(b) (c) (a) WC Cu grain Fig. 1 Optical micrographs of Cu-15vol%WC forging pressed at various pressure (a) 130 MPa, (b) 200 MPa and (c) 270 MPa etched in hydrogen peroxide From Table 1, it appears that an increase in forging pressure from 130 to 270 MPa resulted in an increase in density.
Acknowledgement The author is grateful to Universiti Sains Malaysia for the Science Fund Grant provided by the Ministry of Science, Technology and Innovation, Malaysia (project number 03-01-05-SF0374), References [1] H.

In brief, seeds were immersed in distilled water for 2 d after being cleaned by pure water, and then transferred into each Petri dish (diameter, 75 mm) with one piece of filter paper in (10 grains per dish) and about 1 cm distance between each seed.
In the equation, N represents the number of germinated seeds in per each dish, each point represents the average of three replicates.
Cultivation conditions: volume of MG, 5 mL; rice seeds, 10 grains per dish; temperature, 25 °C in the dark; The values were given as mean±SD (standard deviation) of triplicate samples.
Cultivation conditions: concentration of MG, 1000 mg L-1; volume of mixture (MG and HA), 5 mL; rice seeds, 10 grains per dish; temperature, 25 °C in the dark; The values were given as mean±SD (standard deviation) of triplicate samples.

The fibers obtained from boracic acid are regular in diameter , the surface of BN fiber is smooth and without defects.Fig. 3 (a)shows across-sectional FE-SEM image of the BN fiber.The matrix of fiber is composed of fine grains which have between 20 to 50 nm in size.
The growth of grain is good and the voids of grains are fewer.The fibers had high crystallinity after high temperature treatment .
Fig. 3 FE-SEM micrographs of surface and cross section of the BN fibers Fig. 4 XPS of BN fibres; a) general survey, b) B1s peak, c) N1s peak Table 1 Tensile strengths of the obtained BN fibers Sample number 1 2 3 4 5 6 7 8 9 10 T (cN) 3.3 3.5 3.6 4.0 4.1 3.7 3.4 4.2 3.9 3.4 D (µm) 5.5 5.8 5.7 6.1 6.2 5.8 5.6 6.2 6.0 5.5 Tensile strength (GPa) 1.36 1.30 1.38 1.34 1.33 1.37 1.35 1.36 1.35 1.40 The obtained BN fibers were white and having good continuity with lengths of far greater than 500 m, as shown in Fig. 5.

A number of parameters, such as the size, shape, aspect ratio and distribution of the reinforcement particles, affect the properties of the composite.
Tensile strength decreases with particle size for temperatures up to nearly 80 ºC, but afterwards it seems to be independent of grain size.
For the tests using silica as abrasive, however, abrasion occurs mainly in the matrix, leaving the filler grains standing out relative to the surface, Fig. 5a).
Conclusions The tests performed on the three materials indicate that fracture toughness is improved by the presence of filler, and that it increases with grain size for temperatures below 60ºC.

Experimental we determined the superior limit of grain size, maximum 0.15 mm.
Extrusion pressure variation, on Oerlikon EP10 line, function grain size, is presented in the diagram in figure 1.
Ag145 powder extrusion pressure variation, p, function grain size, g The coating coefficients recommended in scientific literature [4] are presented in table 1.
Acknowledgements: „This work was supported by a grant of the Romanian National Authority for Scientific Research, CNDI– UEFISCDI, and project number PN-II-PT-PCCA-2011-3.2 - 0918”.

SiC particles reinforcement was optimized using fine grain to enhance the anti-wear and self-lubricating properties of the alloy matrix.
The graphite mainly exists at the grain boundaries of Cu alloy and forms a homogeneous dispersion in the copper alloy matrix, which facilitated the lubricating function of the graphite.
The surface of the samples without SiC particles is smooth, but the furrows formed by friction are the most in number and deepest as shown in Fig. 4 (a), which proves that the wear loss and friction coefficient are lower in the sample without SiC particles, but the surface deformation resistance in this sample is poor.

SA Structure to Aerodynamics Orbital module and interstage length AT Aerodynamics to Trajectory Aerodynamic coefficients TA Trajectory to Aerodynamics Mach number, Angle of attack, Reynolds number, Stage number TABLE II.
The six design modules are motor configuration design, optimum nozzle profile design, grain design, case design, insulation and igniter design.
The three analysis modules are nozzle performance analysis, grain regression analysis, and case and grain structure analysis.
These tables present coefficient values relative to Mach number, Reynolds number and angle of attack.
Optimization results parameters Description Initial pointa best known solution by SA X1(m) First stage diameter 2 1.55 X2(m) Second stage diameter 1.884 1.300 X3(kN) First stage thrust 1590.61 1500 X4(kN) Second stage thrust 233.648 233.0 X5(sec) First stage burning time 60 60 X6(sec) Second stage burning time 162.263 114.5 X7(deg) maximum angle of attack during first stage maneuver 8 8 X8(deg) final pitch angle -2.943 -9.4 X9(sec) course time 22.762 11.3 Objective function SSPLV gross weight(kg) 49933 46173 n Number of function evaluation <160 >1500 a. best known solution by gradient-base methods[6] References [1] Blair J.

It does not require any statistical information about the history of grain storage and expertise knowledge, result of a finite number of temperature sensors is enough.
The system is accurate and reliable; guarantee the quality and efficiency of the grain storage.
And summation the weight of each sensor is equal to the number of sensors.
Using a number of sensors cover the whole block can extend the spatial coverage.
Temperature Measurement System in Grain Depot Based on Multi-sensors Data Fusion [J].

Enriching: There are a number of ways to enrich refills.
According to the standards, the amount of weak grains of rubble should not exceed 10%, but very often they have equal strength.
Therefore, if we shake the granule of different strengths but of the same size, the grains will be stratified, the weights will go down, and the light ones will rise up.
The number of breaking stages depends on the degree of crushing of the rock.
If the crusher operates in a steady state with different hardness rocks, the lower is the rock hardness, higher the product will be fine-grained.

It accounted for about 25% of the national food crop acreage; Annual production was up to about 127 million tons and accounted for about 27% of the national total grain [1].
Using metal roll combination, peeling rate was high, but corn grain crushing rate was also high [3].
If the spiral ribs is machined on the cast iron roll surface, it can make the cluster move better and the adjacent ribs between the grooves good for gripping the bracts, but at the same time corn ear injury rates and falling rate of grain is increasing[5].
Fallen seed rate, broken rate and peeling net rate determination method was defined as following: Testing method of fallen seed rate η1：η1= WL / WZ×100％ (1) In above formula, WL: quality of fallen seed; WZ: total mass of corncob on the discharge port; Testing method of broken rate η2: η2= WS / WZ×100 (2) In above formula, WS: quality of damaged grain; Testing method of peeling net rateη3: After testing, referencing to inspection reports of other types corn peeling machine [6], picking out corncob with equal to or more than 2 leaves from tested totality n1 and recorded as n2.
The text set the total number of tests for two.