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Acknowledgements This work was supported by the Hebei soft science plan program (12457202D-51), Hebei Natural Science Foundation (G2013208162), and Humanity and Social Science Youth foundation of Ministry of Education of China (12YJC630038).
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Silicon nitride ceramic is a wave-transparent materials with the best combination in the structural ceramics, it suitable for fabricating elevated temperature antenna window materials for their excellent properties, including high-temperature strength, high hardness, excellent dielectric properties, low coefficient of thermal expansion, etc [1,2].
Porous silicon nitride ceramic with low density, with dielectric constant between 2.5 and 8, dielectric loss <0.008, sufficient mechanical strength, is regarded as the most promising new wave-transparent materials, it has been fabricated by different methods, such as adding the fugitive pore-forming method [3], gelcasting[4], freeze-casting[5], silica reaction sintering, etc.
However, the pore-forming agents while preparing porous silicon nitride used to be excluded in oxidizing atmosphere, and this method will increase the oxygen content of silicon nitride powder surface, at the same time, the pore-forming agent is difficult to eliminate, the carbon remained in samples affects the electrical properties of materials.
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Smart characterization of magnetic materials is also critical for sensor design and development [6-10].
The present study attempts to shed light to the nucleation and growth mechanisms during solid state processes which influence the resulting microstructure and properties of these materials [1,2,13,19,21-25].
The ribbons preparation and the measurements took place in Slovak Academy of Sciences (Institute of Physics).
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Karagianni, Sensor Lett. 11, 4, p. 670, 2013 [25] Saci Messaadi, Mosbah Daamouche, Abderrahim Guittoum, Hadria Medouer, Noureddine Fenineche, Ibtissem Zidani, Key Engineering Materials, 495, p.1-4, 2012 [26] Malek J., Kinetic analysis of crystallization processes in amorhous materials.

Material Properties Sandwich panels are made from various materials while many of researchers used different materials for wythe and core to identify its structural properties.
These included foam concrete, steel, timber, insulation materials and others.
Wiley Series in Polymer Science.
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Acknowledgment This project is supported by the Natural Science Foundation of Guangdong Province (No. 06025546).
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Introduction In Korea, structural steels have been used as an important construction materials for not only middle level, but high rise buildings.
This is because it has lots of merits, such as faster construction period as well as higher and longer space in the building than other traditional structural materials.
Fire Engineering Method and Material Databases at High Temperatures Fire resistance of structural materials and frames can be determined by the prescriptive method or the fire engineering method [2].
Generally, the fire protective materials thickness has been evaluated by a specific way defined in a standard.
Kwon, "A Study on the properties of SM 400 for evaluation of structural stability at high temperature", Journal of Korean Institute of Fire Science and Engineering, Vol. 27 No. 4, pp. 7-12 (2013)

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Such materials can absorb water molecules from the iron powder.
We also thank the Editor of this Journal.
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