Search results

The decrease in optical transmission can be related to the loss of light due to oxygen vacancies and scattering at grain boundaries.
Excitonic peaks likely to appeared for undoped ZnO which indicates the number of defects is reduced and the quality of the films is improved.

- intergranular fracture, as its name implies, occurs when the grain boundaries are the preferred fracture path in the material [5].
The SEM images were obtained in the backscattering electron mode, whose main mechanism of contrast is related to differences in average atomic number between the phases present.

Welding an aluminum possesses a number of properties that make it different compared to welded steels which are: (i) high thermal conductivity, (ii) high thermal expansion coefficient, (iii) low melting temperature, and (iv) the absence of color change as temperature approaches the melting point.
Fine grain oxide was found to develop in protective parent metal and non protective flake-like oxide was found covered the entire area of fusion metal.

Haydite Shale Grain size [mm] 1h bibulous water Cylinder pressure strength(mm) Coefficient of softness packing density [kg/m3] 5--15 1.43% 8.7 95.8% 840 Concrete Design.
Concrete Design(water-cement ratio 0.35 for example) [ ㎏/m³] Number Light-weight Aggregate Cement Water Sands Shale Gravel A 0% 500 175 880 0 1085 B 20% 500 175 880 136 868 C 40% 500 175 880 272 651 D 60% 500 175 880 408 434 E 80% 500 175 880 544 217 F 100% 500 175 880 680 0 Test Method.

Over the past decades, a large number of researchers have been trying titanium alloys in an attempt to combine most of their advantages, such as high specific yield strength, good corrosion resistance and excellent fatigue property by casting route [1].
The γ-single phase TiAl alloys are sensitive to unacceptable grain growth effects during hot-working and subsequent heat treatment [2].

In reaction, the formation of a large number of nuclei in a very short time through a well-known "Ostwald ripening process"[1] and then crystals grow comparatively slowly.
This result reveals that the capacitance is co-decided by the process of oxidation and the speed of nuclear growth. 75 °C may be more suitable to forming a dandelion-like manganese dioxide with high specific surface area and medium grain size, which has the optimum performance.

To improve the reaction kinetics and diffusion properties, a reduction of the grain size and the addition of various catalysis have been investigated [4, 5].
In our previous study, we reported the pressure-composition (PC) isotherm of Mg/Pd laminate composites (Mg/Pd=13.7 and 6) at 573K, where (Mg/Pd) means the ratio of number of Mg to Pd, have plural hydrogen pressure plateaux during hydrogen absorption and desorption [7].

Although the Face-Central-Tetragonal (FCT) structure of TiAl is very similar to the Face-Central-Cubic (FCC) structure, the number of independent slip system in the former is far less than in the latter, since the c/a=1.02 in TiAl[2, 3].
(a) RT (b) 650℃ Fig. 4 Microstructure of NG TiAl deformed under quasi-static loadings (a) 320s-1 350℃ (b) 1350s-1 650℃ Fig. 5 Microstructure of NG TiAl deformed under high strain rate loadings In TiAl, as the strain rate increases, resistance to dislocation motion increases and the grains tend to twin [17].

The interfaces are thought to prevent grain boundary sliding and dislocation propagation and, thus, contribute to the found significant enhancement in the hardness[4-5] ;On the contrary, the “incorrect” interfaces will reduce the interface binding force and reduce the hardness obviously[6].
(a) (b) Fig.3 The variation of bond lengths of TiN(111)/BN/TiN(111) (a) and TiN(001)/BN/TiN(001) (b), a number represents a specific layer.

Accordingly, the similarity in the XRD traces (Fig. 1(a) and (b)) between the synthetic composite hybrids and natural bone suggested that the grain of inorganic phase formed in the composite hybrids is nanometer-grade in size.
In addition to the rough cross-sectioned surface, a large number of fibrous substances (collagen) existed in the synthetic hybrids and formed a network matrix.