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The growth rate and size of PLA grain are different in the different heat-treatment conditions.
The size of the grain will affect the PLA properties.
When the grain size is larger than 100 μm, it will reduce the PLA mechanical properties.
That is, the larger the size of grain is, the lower the bend load can withstand [10].
The project number is MOST-105-2221-E-150-014.

The films were made up of big grains with inhomogeneous size, the maximum size beyond 400nm while the minimal size was several decade nm.
When the bias voltage rise to 200V, the films surface melt, it is hard to recognize single grain.
When the bias voltage reaches 250V, the interface amid grains is obvious, and grain size growing bigger tendency appears renewed.
If the bias voltage was excessively high, on one side the number of deposited atoms may decrease affected by the strengthened sputtering effectiveness of bombardment of particles, on the other side, bombard power lead to temperature of bulk material arose, made the atoms diffusion ratio in films changed, tend to high temperature integral diffusion, recrystallization tendency appear in films, grain with more obvious border tend to grow bigger and bond compactly.
The films with fine surface crystal grains, high plainness and high bond strength possess perfect wear-resistant properties, but have no correspondence changing tendency with phase structure changing tendency.

.% Al alloy transforms to a fine-grained two-phase equiaxed structure which exhibits optimum superplastic properties at approximately 250°C.
Astanin et al. [12] has suggested that a mechanism of cooperative grain boundary sliding conditions these phenomenon.
In this study, incorporation of the ceramic particles reduced the percentage elongation as has been observed for a number of metal matrix composites.
In their study they determined that in 1 µµµµm 50 µµµµm the temperature range where grain boundary sliding controlled plastic flow, the strength of the composite was lower than the unreinforced matrix alloy even after compensating for grain size and threshold stress.
PerezPrado et al. [18] discuss the relative contributions of grain boundary sliding and crystallographic slip in some detail.

The system designed was fabricated and then test-ran with dry dust laden air stream in order to determine its cleaning efficiency with respect to variation in fan speed and dust grain size.
It was observed that the cleaning efficiency of the machine was high at a higher fan speed and low grain sizes.
In this model gas spins through a number of revolutions Ne in the outer vortex.
According to [17], Ne may be expressed numerically as: (8) Where Ne = number of turns made outer vortex H = height of inlet duct Lb = height of cyclone body Lc = cyclone cone section height The air residence time in the outer vortex: (9) Where t = time spent by gas during spiralling descent (sec) Dc = cyclone body diameter Vi = volumetric flow to cyclone Figure 1.
Results and Discussion Tests were carried out on granite stone dust of different grain sizes, with a varied fan speed so as to compute the various values for corresponding pick–up time, suction and cleaning power of the equipment.

Hence, the TiO2 grain growth is enhanced because the oxides tend to segregate in the boundaries and therefore, altering the electrical characteristics.
This may be caused by too much resistivity in the grains.
The effective breakdown voltage is proportional to the number of grain boundaries and inversely is proportional to the grain size.
Low breakdown voltage was achieved because of the large grain size which can be seen in Fig. 4.

The results indicate the introduction of coarse grain size limestone powder into concrete is unfavorable to Cl- penetration resistance, which gradually deteriorates with increasing of limestone powder.
For common cement whose average grain diameter is in the range of 20µm~30µm, the addition of more fine limestone powder (average grain diameter below 7.5µm) can fill pores and interspaces among cement grains and increase compactability of concrete.
Air-entraining agent can produce a large number of micro pores (below 200µm), it can cut capillary channel.
Fig.5 Influence of air entrainer amount on Cl- diffusion coefficients of concrete Fig.4 Influence of air entrainer on Cl- diffusion coefficients of concrete Conclusions The introduction of coarse grain size limestone powder is unfavorable to Cl- penetration resistance of concrete, but it can improve Cl- penetration resistance by using super fine limestone.

On the Fig. 1 large grains of titaniferous magnetite and smaller grains (white) of metal iron are visible.
On the Fig. 3 large grains of titaniferous magnetite, smaller grains (light) of ilmenite and the smallest grains (white) of metal iron are visible.
The shooting mode was step-by-step with interval ΔB = 0.05 T, the exposure value for each field was 2 seconds, the number of measurements (points) on each value of the field was 5, scan the field was ± 2 T, the sample temperature was 300K.

The sensitivity value is influenced by a number of factors, among which first and foremost design and technology.
Experiment and Discussions In this article the experiment to determine the impact of process parameters on the magnetron deposition rate and the grain size in films of FeNi 20:80 was conducted.
It is shown the substrate temperature significantly influent on the average grain size in the film of permalloy at a constant magnetron power of 150 W and a working gas pressure of 0.5 Pa.
Other magnetron deposition parameters affect the average grain size and output signal of AMR sensors much weaker.
Pushkina, Effects of average grain size on the magnetic properties of permalloy films, EPJ Web of Conferences. 185 (2018) 01003

To produce refractory olivine bricks, finely ground magnesia is added to the olivine grains to convert the SiO2 and the FeO of the decomposed fayalite into forsterite and MF-spinel [1].
The presence of free periclase restrained the grain boundary motion and produced a dense, small-grained spinel body [6].
The total porosity increase slightly addition of the sintered magnesia due to powder fills in spaces among the olivine grains.
The Kümaş fine sintered magnesia is agreeable to bind the dunite grains.
Acknowledgments The authors acknowledge the financial supports of Dokuz Eylül University Research Fund (Project number: 0908.01.06.05).

Up to early 19 th century, most of the world's farmers reaped and threshed grain with hand or animal power.
The crop factors are moisture content of the grain, variety of crop, method of drying after harvest, density and specific gravity, shape and size of the grains and strength of the grains.
The cleaner performance is most affected by grain angle of repose, chaff friction, density, and chaff mean length./2/ It is also observed that the separator performance was most affected by grain angle of repose, straw density and grain density.
A performance study of grain combines with barley reported that increasing grain to MOG (material other than grain) ratio severely increased shoe loses while rack losses were affected /6/.
Ten trails were carried out and calculated as follows: 
 X X ∑= Where X = angle of friction N = number of measurements ΣΧ = sum total of measured angles A combination of feed rate (F) at 2 levels (24kg/hr and 48kg/hr); crop varieties (V) at 2 levels (B301 and C70); and cylinder Speed (S) at 3 levels (65, 70, 75 rpm); were selected.