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Introduction Desulphurization gypsum products are widely used with a number of advantages as a construction material: extensive deposits of raw material and low production costs.
At the same time, Ca2+, OH–, SO42– in the system diffuse quickly to the surface of the alunite grain so that the active SiO2 and Al2O3 dissolve from the grain surface, and then form CSH and CSAH gel with other components.

However, in order to synthesize nano-sized iron oxide powders, the traditional high temperature solid state route is inappropriate, as it leads to coarsening of grains.
The crystallite size of Fe and Fe2 O3 have been calculated using Scherrer’s equation where, D is the grain size, K is a constant taken to be 0.94, λ is the wavelength of the x-ray radiation, β is the full width at half maximum and θ is the angle of diffraction.
Using the particle number and particle diameter of the particle in the TEM image the particle size has been calculated.

The liquid material is introduced into the injection machine at 650ºC, in short time the slurry is formed by temperature control and the effect of the grain refined additives.
The consequence has been obtaining components with a small number of defects and the partial reduction of porosity.
Micrographic analysis: As-cast microstructure of A356 alloy consists of primary small size grains of α-aluminium solid solution surrounded by the eutectic.

Introduction Vertebral compression fractures causing severe pain and immobility are increasing in number with the aging population.
The ZrO2 was found in the lower left part of Figs 4a and 4b as grains with large diffraction contrast.
The ZrO2 with its high density and diffraction contrast in the lower left part is easily detected whereas the CA and bone are not so easily interpreted. b) The contact zone has a high density of needle like grains, which seem to include apatite crystals. c) The EDX analysis from the contact zone indicates simultaneous presence of apatite, calcite and katoite.

Fig. 1 : As-grown [11-20] 4H-SiC: XRTT images (g = 1-101) showing in a ) screw dislocations (1) basal dislocations (2) a micropipe (3) and in b) sub-grain boundaries ; c) HRTEM image viewed along [11-20].
Some sub-grain boundaries are also detected by XRTT (Fig.1b).
Thus, we assume that the straight lines in XRTT images and Neutral plane a) b) Journal Title and Volume Number (to be inserted by the publisher) 3 the particular etched structure showed in figure 3 reveal the intersections of faulted half loops or nano-twins with the sample surface.

Commercial SiC with grain size of ~500 µm served as a growth source.
In some experiments, silicon of about the same grain size was added to the source.
The luminescence spectrum of the heterostructures studied contains a number of peaks, of which the shortest-wavelength peak (B0) lies at 2.125 eV and can be interpreted as due to radiative recombination of nitrogen-aluminum donor-acceptor pairs in 3C-SiC [5].

MODEL The frequency dependence of the average relative complex permeability µr* is explained using a model in which SiO2 grains with the relative complex permeability µr*(1-j0) are isolated in a Ni-Zn ferrite medium with relative complex permeability µ2r*.
The grain size of fine FNZ is approximately 10 nm and that of SiO2 is approximately 200 µm.
As mixing time increases the number of fine SiO2 particles generated increases, and fine chains of SiO2 particles are formed.

A Facile Preparation of Carbon-supported Nanoscale Zero-valent Iron Fibers Qingshan Kong1, 2* Corresponding author: Kong qingshan, E-mail: kongqsh@qdu.edu.cn Telephone number:0532-85954780 , Chunxiang Guo1, 2, Bingbing Wang1, 2, Quan Ji1, 2 and Yanzhi Xia1, 2 1Advanced Fibers & Modern Textile Cultivation Base for State Key Lab, Qingdao University, Qingdao 266071, China 2Department of Polymer Science, College of Chemical and Engineering, Qingdao University, Qingdao 266071, China email: kongqsh@qdu.edu.cn, 1986guochunxiang@163.com, wbbabcdefg@163.com, jiquan@188.com, xiayzh@qdu.edu.cn Keywords: Carbon-supported zerovalent iron; Ferric alginate fiber; Wet spinning; Nanoscale; thermal treatment.
The image from the cross section of fiber revealed that the metal particles having spherical nanostructures with grain sized of approximately 50-120 nm (diameter) were well dispersed over the amorphous porous carbon substrate, as shown in Fig. 1c.
Iron metal particles having spherical nanostructures with grain sized of approximately 50-120 nm (diameter) were well dispersed over the amorphous porous carbon substrate.

., has been commonly researched [3-5].At the same time, some researchers have conducted a number of studies about Boron and Nitrogen co-doped nano-TiO2 photocatalyst properties and its structure change mechanism [6].
Boron and Nitrogen ions enter the grain boundaries of TiO2 crystal, which could reduce the grain boundary.

When temperature changes from 1180℃ to 1190℃, the grain grows too large so that the internally generated a huge number of domain walls which dropped the covercivity significantly.
Since the thick films will become more compact and the grains grow larger and more uniform with the sintering temperature rises so that the remanence steady improve.