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On the other hand, a number of studies have been carried out to improve the densification and piezoelectric properties of NKN ceramics by adoption of doping elements as modified NKN ceramics [11-23].
Zhang, Ferroelectric and piezoelectric properties of fine-grained Na0.5K0.5NbO3 lead-free piezoelectric ceramics prepared by spark plasma sintering, J.

Recycled aggregates (from construction, demolition and excavation waste) are increasingly used as partial replacements of natural aggregates, while a number of manufactured aggregates, including air-cooled blast furnace slag and bottom ash are also permitted.
These very fine-grained materials are added to the concrete mix to improve the properties of concrete (mineral admixtures), or as a replacement for Portland cement (blended cements).

The Heat and Metallurgic Affected Zone (HMAZ) near the copper junction appears as the zone where the grains morphology is completely different from the microstructure of the initial metal sheet.
The maximum value of the time step is computed as where w denotes the width of the test part, NoS the number of steps considered, and ws the velocity of the welding-brazing torch.

Experimental Process All the specimens was checked the name and number packets, and checked the machining accuracy and measurements before measured.
The specimen color, grain, bedding, joints, cracks, degree of weathering, moisture status and processing problems was described.

Acknowledgment The authors gratefully acknowledge financial support by the Malaysia fundamental research grants scheme R/FRGS under grant number of A1300/01367A/006/2018/00566.
T Fang, Effect of copper‐rich secondary phase at the grain boundaries on the varistor properties of CaCu3Ti4O12 ceramics, J.

Besides, nano-SiO2 can react with Ca(OH)2 generated at the early stage at an extremely rapid rate, and it can efficiently refine the grain of Ca (OH)2.
It can be found that the number of large holes and micro holes inside the concrete were declined significantly under electron microscope with the usage of nano modification agent.

Fig.5 was surface morphology of anode oxidation film layer after wearing, seen form Fig.5 (a), there were a large number of furrows grinding worn shades along movement direction on the wear surface, abrasive dust was strip material and hard phase particles, showing the wear mechanism was particle attrition.
Alumina film was brittle film [9], its carrying capacity was limited, when the load exceeded strength of oxide film, the deformation failure of oxide film would occur, the fragment that fall off from material became hard grind grain that leaded to strong particle attrition and speed up the oxide film wear process.

Beryllium also has the important characteristics, such as the low atomic number, and high strength.
Results[1~2] showed that the methods could control the crystallizing process of weld metal and refine weld metal grain, as well as improve the structural properties of the welding joint.

Table 1 Three kinds of surface treatment for experimental study Sample Numbering Testing Material Treatment Process 1 TiN Physical vapor deposition 2 Nickel tungsten Brushing electroplating 3 hard chromium electroplating 4 SKD61 No coating Figure 1 stripping performance testing platform Figure 2 stripping performance histogram 3.2 Surface topography analysis of coatings For the purpose of mastering the surface microstructure and topography’s effect on stripping performance between coatings and molten PC, we observed by SEM surface topography, microstructure and 3D shape of the second phase between brushing plating nickel-tungsten and electroplating hard chromium respectively in figure 3 and figure 4.
Hard chrome plating apparently held rough micro-structure, coarse grains, and overall peaks and troughs, which caused a larger flow resistance for PC and poor stripping performance between them.

This results in a variety of crystal defects such as dislocations, vacancies, stacking faults and an increased number of grain boundaries.