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Gypsum Mortars with Different Types of Aggregates: Design and Properties Magdaléna DOLEŽELOVÁ1,a, Jitka KREJSOVÁ1,b and Alena VIMMROVÁ1,c * 1Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29 Prague, Czech Republic amagdalena.dolezelova@fsv.cvut.cz, bjitka.voborska@fsv.cvut.cz, cvimmrova@fsv.cvut.cz Keywords: Gypsum paste, gypsum mortar, fine aggregate, mixture design.
Behavior of gypsum mixture with some alternative aggregate types such as a recycled rubber particles from end-of-life tires [2], was already investigated, but the influence of type, shape and structure of common types of fine aggregate particles on gypsum properties has not yet been investigated in detail.

Acknowledgements The authors are very grateful to Boris Sukhov, Deputy Director of Institute of Chemistry (Irkutsk); Mikhail Novikov, Evgeny Titov and Vera Vokina (researchers of the laboratory of biomodelling).
Klotz. et al., Cellular responses to nanoparticles: Target structures and mechanisms, Nanotoxicology. 1 (2007) 52-71

These compounds are divers in structure (hydroxamate-type, catecholate-type, carboxylate-type, mixed-type) and their selectivity for iron as well as other metal ions.
Kong, Chemistry and biology of siderophores, Nat.

The elongated metal wires or rods on toys, such as remote control car antenna, easily result in children play eyes stabbed because the wire and rod high hardness, high structure.
Table 1 Current toy safety standards in China GB 6675－2003 National toy safety technical specification GB 19865-2005 Electric toys safety GB 5296.5-2006 Using instructions of toys GB/T 9832－2007 Plush and cloth toy GB/T 22753-2008 Coating technology of toy surface GB/T 22048-2008 Toys and children's products: determination of plasticizer of adjacent benzene two formic acid ester in plastic of PVC GB/T 22788-2008 Determination of total lead content in surface coating of toys GB 24613-2009 Limit quantity of harmful substances in toy coatings GB/T 26193-2010 Method of inductively coupled plasma mass spectrometry: determination of antimony, arsenicmigration, barium, cadmium, chromium, lead, mercury, selenium in toy materials GB/T 26175-2010 Test method of kinetic energy for ejection toys GB 26387-2011 Chemistry and related activities in toy safety GB/T 26710-2011 Age warning icon in toy safety GB/T 26701-2011 General technical requirements for products of model GB/T 27730-2011 Determination

After flocculant mixed, the particle structure of sludge was changed, which destroy the stability of colloid and clump together into a floc.
References [1] Qing Chang: Flocculating Science of water treatment(Chemistry Industry Press, Beijing) (in Chinese)

They were: chemistry analysis; particle size analysis; specific area surface; designation of the form of dust particles by optical microscopy and scanning electron microscopy; analysis by energy dispersion, and X-ray diffraction.
The optical microscopy and scanning electron microscopy were used to analyze the morphology and the internal structure of the particles of EAFD.

The significance of environmental education is to make a resource-saving and environmentally-friendly consumption structure as the basic code of conduct by younger generation, to improve their environmental consciousness.
Since 1991, environmental science began to be regarded as the First Level Discipline like mathematics, physics, and chemistry, As the first specialized core course of "Environmental Science" was carried out at universities of science and engineering, environmental education in primary and secondary schools are also required to arrange for elective courses and extra-curricular activities.

Study on Optical Properties and Structure of Sm2O3 Doped Boron-Aluminosilicate Glass.
Journal of Physics and Chemistry of Solids 61 (2000) 1535–1542

Both of these factors lead to the fact that the shape and transverse dimensions of weld beads, as well as structure and properties of the material of product, obtained by layer-by-layer synthesis, can differ significantly from layer to layer, and the product itself will not satisfy operational requirements.
Smirnova, Piotrovskaya and others, Thermodynamics of liquid–vapor equilibrium, Leningrad: Chemistry, 1989

Introduction Membrane bio-reactor(MBR) was paid more attention because its water quality, compact structure, easy management, less remaining sludge, low-power and so on [1, 2].
（in chinese） [5] Yan-ling Gao, Yue-tang Ding, Bing-nan Lv: China Water & Wastewater, Vol,23(2007),p79（in chinese) [6] Xiaoli Yang, Shihe Wang, Ning Lu : Journal of Southeast University (Natural Science Edition),Vol,35(2005),p:797（in chinese） [7] Yoon S H, Kim H S, L ee S : Process Biochemistry, Vol,39(2004),p1923 [8] Shifeng Ji, Danli Xi :Membrane Science and Technology, Vol,28(008),p19（in chinese） [9] Shifeng Ji in: Industrial Water Treatment,Vol,30(2010),p48 (in Chinese) [10] Hai-dong Zhou, Qin-ya Liu, Ye-jian Zhang :Pollution Control Technology, Vol,6(2003),p13（in chinese) [11] Li Xiong, Wen-hong Pu, Chang-zhu Yang : Chemistry & Bioengineering, Vol,1(2005).p31（in chinese)