Search results

Saline playa is mainly composed of loose lacustrine salt-rich sediments in fine grain form [5,6].
In this period, blown by strong wind, the saline sediments were seriously eroded and the number of salt dust storm days would increase in consequence.
Li, The influence of dry lakebeds, degraded sandy grasslands and abandoned farmland in the arid inlands of northern China on the grain size distribution of East Asian aeolian dust, Environ Geol. 53 (2008) 1767–1775

The wear resistance of Al-Si alloys depends on a number of material related parameters, i.e., size, shape, composition and distribution of micro-constituents, in addition to service conditions [2,3].
However, the primary Si particles formed in the hypereutectic Al-Si alloys produced by casting methods, even though modified to refine them, are larger, and the Si particles themselves are hard and brittle, which causes the serious disseverance to the matrix and stress concentration at the tips or edges of the primary Si particles, leading to the cracking at the grain boundary or in primary silicon particles oneself, thereby, the mechanical properties, especially the elongation are significantly reduced [4].
It is important that the CDS method accomplishes the same task efficiently without the additional cost of grain refiners.

For example, egg shell membrane, plant leaves, insect wings, bacterial, DNA, and flower pollen grains have been selected as template to produce various advanced biomimetic inorganic oxide[9-15].
The BJH (Barret-Joyner-Halenda) calculation revealed a narrow distribution for the sample centered at 1-4 nm, proving that biomorphic TiO2 contains large numbers of mesopores, which agrees with TEM test.
Mann, Morphosynthesis of complex inorganic forms using pollen grain templates, Chem.

It consists in causing grains of metal powder to adhere to the surface of expanded polystyrene balls, using an organic binder by using a fluidized bed and then using a thermal sintering technique on a set of the spheres once they have been brought into contact.
Only one step is needed to eliminate the organic components (polystyrene and binder), densify the shells by sintering with grains of powder and assemble the spheres together.
As a indeterminated number of hollow spheres are open because of defect in their shell or because of the sample cutting, the exposed surface of the samples is difficult to determine precisely, the results are given in terms of a simple mass rather than a mass per unit surface.

The cultivation of grain is a dominant industry of agriculture in Latvia.
The total production of grain reached 2.7 million tonnes in the year 2019 of which buckwheat amounted to 28.3 thousand tonnes.
The catalyst with a larger surface area and smaller crystallite size has a larger number of active sites are available.

., no grain boundary porosity exists and still have a few micro-particles in the texture.
With decrease of bi-layer thickness, the four Bragg reflection peaks shifted to higher single angle side, respectively, by mutual diffraction interference due to the grain size decrease from 2.43 down to 1.15 nm, resulting in the superlattice coating formed as show a high resolution TEM in Fig. 1. 30 40 50 60 70 80 TiN CrN 116 nm 95 nm 42 nm 18 nm 8 nm 6 nm 5 nm 4 nm 3 nm 2 nm CrN(311) TiN(311) CrN(220) TiN(220) CrN(200) TiN(200) CrN(111) TiN(111) Intensity (a.u) 2 Theta Fig. 1 Typical SEM cross-section and HRTEM image of a nanoscaled TiN/CrN multilayer structure (S9).
Acknowledgments The authors gratefully acknowledge the National Science Council, Taiwan for funding support under contract number NSC 94-2745-E-451-008-URD.

Furthermore, high decomposition temperature of sulfate inhibits grain growth resulting in small particle size and less agglomeration [17,18].
YAG powders agglomeration can be attributed to too fast grain growth, which is detrimental to the densification of YAG ceramic [24].
For YAG-1.5 there are a large number of fine particles around the coarse particles.

Initial time 196 [min] Setting time 267 [min] Specific surface 377 [m2/kg] Average grain size 20 [µm] Density 3110 [kg/m3] Bulk density 980 [kg/m3] Table 2.
Density 2120 [kg/m3] Specific surface 225 [m2/kg] Average grain size 87 [µm] Before adding to concrete mix, nanosilica had to be treated in the ultrasonic bath Bandelin Sonorex Super RK 106.
Similar results were shown by a number of authors, e.g.

The specimens were etched to show the grain boundaries in the microstructure using the (NH4OH+H2O2+H2O) etchant [16].
Nearly equiaxed grain morphologies are generated, and Be addition modifies the Cu-Zn-Al alloys' structural characteristics. 4.
[18] J L Olajide F J Zannu, O O Daramola, A S Ogunbadejo, E A Okotete, E R Sadiku and K K Alaneme, Morphological characterization, in vitro biomedical corrosion and corrosion behaviour of As-Cast Cu-Zn-Al-FeMn alloys in selected intravenous and industrial fluids, Materials Research Express, Volume 6, Number 9, 2019.

The latter method allows to obtain nanocrystalline/amorphous, amorphous or polycrystalline materials and to control the grain size of the obtained Ni-Mo coatings from several to hundreds of nanometers.
It should be stressed that independently on the type of the plating bath used, with the increase in the Mo content in electrolyte, the grain size of the electrodeposited Ni-Mo coatings decreases.
Number of these micro-spheres is dependent on the electrochemical conditions of deposition.