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PLA can not only be synthesized from petroleum, but also be made from plant resources, such as corn, wheat, grain, beet, etc.
In this method, PLA fiber will be rapidly decomposed through the existence of a large number of bacterium.

Introduction With the development of cities’ construction, in the pile foundations of construction, there is an increasing number of using the technology of underground works such as cast-in place pile, diaphragm wall, and slurry shield.
Different geological structures and different mud systems have different viscosity, density, solid concentration as well as grain fineness distribution.

Numerical prediction of this effect is thus very important but complex due to the numerous parameters involved: material properties, number of cutting steps, paths geometry, etc.
For example, in this context the development of more accurate constitutive material model (grain size modeling) can improve the bulk stress prediction in the forged component after the heat treatments.

The microstructures of these alloys are characterised by a number of features, including the identity and volume of intermetallic, the amount of solute in solution and the eutectic morphology.
From microstructural investigations into the eutectic, it is apparent that the intermetallic phase in the MgLa alloys is more or less continuous along the grain boundaries and the lamellar structure is consequently more or less surrounded by the intermetallic.

The soil-water characteristic curve is calculated based on Grain Size advanced by Arga.L.M and J.F.Paris [9] , as in Fig. 1; Because the penetration coefficient of the unsaturated soil varies with the water content, the penetration coefficient is also the function related to the suction of the soil.
The unit divided is 788, and the joint number is 847.

The calcite content of clay minerals is relatively low, but in those cases when calcite grains are ground finely, size smaller than 1 mm, spottiness caused by enrichment of free lime cannot be expected.
Composition of the prepared samples 1. 100.0 % 0.0 % 2. 97.5 % 2.5 % 3. 95 % 5 % 4. 92.5 % 7.5 % 5. 90 % 10 % 6. 87.5 % 12.5 % 7. 85 % 15 % 8. 82.5 % 17.5 % 9. 80 % 20 % Sanded clay Clay 1 Number of mixture Composed mixes were ground in a pan mill for 20 minutes as it is usual in industrial practice.

Their evaluation can facilitate the resolution of a number of key engineering problems, such as stress relief cracking.
Each reflection is produced from a different family of grains, which are oriented such that a specific hkl plane diffracts to the detector.

Fig.3 Specimen 2 Fig.4 Section appearance chart of specimen 2 In Fig.2, we can find a great number of holes in the specimen 1,which are smaller than 100μm and distributed evenly.
Table 1 Performance parameter of specimen 1 and specimen 2 specimen Crystalline phase Crystalline ratio (%) Grain size (μm) Density (g/cm3) Expansion rate(%) Porosity (%) Impact toughness (KJ/m2) 1 gehlenite, Low nepheline 77.75 <8 1.610 25.0 23.69 12.9891 2 gehlenite, Low nepheline, akermanite 80.62 <14 2.126 1.3 17.48 1.2317 Take another glass-ceramic sample 1, place it in a hydraulic press with pressure of 20Mpa for 24h and we can get specimen 3. 2.2 Friction and Wear Test Friction and wear properties of glass ceramic are evaluated by M-200 fraction and wear tester. 

Introduction An increasing number of demand for the simulatability of prosthesis, the aesthetic effect of dental all-ceramic materials have gradually become the research hotspot.
Table1 Crystalline phase parameter of 4 kinds of core materials Major crystalline phase Crystal grain size [mm] Refractive index Pocelain matrix － － 1.50 Zenostar Zirconia 1-5 1.76 Lava Zirconia Zirconia 1-5 1.76 Upcera Zirconia Zirconia 1-5 1.76 IPS e.max press Lithium disilicate 0.4-5 1.55 Table2 Tukey’s multiple-comparison test of transmittance(t)of 4 kinds of core materials (r<0.01) Core materials Mean±SD[%] Tukey grouping Vita Alpha Opaque A1(0.5mm) 9.475±0.194 a Vita Alpha dentine A1(0.8mm) 10.651±0.085 b Vita Alpha Opaque C4(0.5mm) 5.530±0.233 c Vita Alpha dentine C4(0.8mm) 6.686±0.178 d IPS e.max press LT (0.5mm) 6.750±0.212 d IPS e.max press MO (0.5mm) 6.113±0.191 e Zenostar pure (0.5mm) 2.117±0.154 f Zenostar intense (0.5mm) 1.578±0.161 g Lava Zirconia FS1 (0.5mm) 2.135±0.199 f Lava Zirconia FS7 (0.5mm) 1.604±0.103 g upcera Zirconia ST (0.5mm) 1.265±0.202 h upcera Zirconia HT (0.5mm) 0.995±0.194 i Discussion Modern dental all-ceramic core materials can meet the need of

From the optical microscopy images (Fig.6), it can be seen that a large number of Al60V40 master alloy particles with sizes in the range of 25 to 50 mm and residual pores with sizes in the range of 1 to 10 mm are present in the sample produced by forging the compact of powder mixture without holding.
The microstructure of sample produced by forging the compact of MA powder without holding consists of equiaxed alpha grains (Fig. 6(d)).