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Size effect, referring to mechanical properties of materials change with the geometry changes, is the basic characteristic of brittle and quasi-brittle materials.
Introduction Size effect[1-2] means the mechanical properties of the material is no longer a constant, changing with the geometry changes, For concrete materials, compressive strength and tensile strength decrease with the sections size increases, on the contrary, the fracture energy increases.
Size Effect Theory of the Concrete The strength of concrete, composed of several materials with different strength, is determined by the proportional relationship between the strength of several materials.
Zhang: Journal of Hohai University, Vol. 32(3) (2004), P.291.
Saleh: Journal of Engineering and Applied Science, Vol. 54(3) (2007), P.303

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Many researches indicate that an obvious difference exists between the fracture properties of concrete materials and metal materials, i.e. for concrete materials, a micro-crack zone will emerge at the macro-crack tip during structure loading, that is the fracture process zone, and the macro-cracks have propagated to some extent before the structure loses stability.
It is clear that the original critical curve is on the conservative side and too strict with engineering materials.
Crack extension resistance and fracture properties of quasi-brittle softening materials like concrete based on the complete process of fracture, International Journal of fracture, 1998, 92:71-99
Mixed-mode fracture toughness testing of concrete beams in three-point bending, Materials and Structures,1988,37:385-406
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Poly(Lactic Acid)-Polybutylene Succinate-Activated Carbon Composite Foams Kittimasak Ketkul1,a, Poonsub Threepopnatkul1,b*, Darunee Aussawasathien2,c, and Kittipong Hrimchum2, d 1Department of Materials Science and Engineering, Faculty of Engineering and Industrial Technology, Silpakorn University, NakhonPathom, 73000, Thailand 2National Metal and Materials Technology Center (MTEC), KhlongNueng, KhlongLuang, PathumThani, 12120, Thailand akittimasak_k@yahoo.com, b*poonsubt@yahoo.com, cdaruneea@mtec.or.th, dkittipoh@mtec.or.th Keywords: Poly(lactic acid), Polybutylene succinate, Activated carbon, Foam.
Foam packagings are generally porous materials which have high surface area, high permeability, and light weight, leading to lower cost of processing.
Acknowledgements The authors gratefully acknowledge the financial support from National Metal and Materials Technology Center (MTEC), a member of National Science and Technology Development Agency (NSTDA) under the project code of P1550631.
Watada, Ethylene absorbent to maintain quality of lightly processed fruits and vegetables, Journal of Food Science. 56 (1991) 1589-1592
Li, Mechanical properties of PLA/PBS foamed composites reinforced by organophilic montmorillonite, Journal of Applied Polymer Science. 131 (2014) 40773-40780

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Zhang: Journal of hazardous materials, Vol. 186 (2011) No.2-3, p.1392
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Badamshinad 1Institute of Problems of Chemical Physics of Russian Academy of Sciences,1 Ac.
Dong, Preparation and Properties of Two-Component and Double-Crosslinking Waterborne Polyurethane-Acrylic Dispersions, Open Journal of Organic Polymer Materials, 3 (2013) 27-33
Lee, Waterborne polyurethanes and their properties, Journal of Polymer Science: Part A:Polymer Chemistry,34-6 (1996) 1095-1104
Zhong, Synthesis and adhesion properties of waterborne polyurethane dispersions with long-branched aliphatic chains, Journal of Applied Polymer Science,132-12 (2015)
[9] ASTM D2572-97 “Standard Test Method for Isocyanate Groups in Urethane Materials or Prepolymers”, 2010

Introduction Multiferroics are the multifunctional materials which exhibits coexistence of at least two of ferroelectricity, ferromagnetism and ferroelasticity in a certain temperature range[1].
Especially for the new information storage, the magnetoelectric coupling in multiferroics can overcome the effect of fatigue properties in polarization reversion of multiferroic materials, and provide more flexibility and freedom of structural design[2-3].
Raman spectroscopy has been demonstrated to be a very useful technique in studying phase transitional characteristics and local structure modulation in ferroelectric materials.
Das: Journal of Applied Physics, Vol. 119 (2016) No.23, p. 234102
Awan: Progress in Natural Science: Materials International, Vol. 23 (2013) No. 5, p.487

Introduction During the last decade tellurite glass has been an interesting research subject in science and technology.
Abbas Ahmed, New tellurite glass: Optical properties, Materials Chemistry and Physics.109 (2008) 291-296
Indonesian Journal of Applied Physics 2 (2012) 151-153
Reactive Index and Optical Properties, Journal of Optoeletronics and Advanced Materials 6 (2004) 747-753
Wan-Yusof, Optical Properties of Bismuth Tellurite Based Glass, International Journal of Molecular Sciences 13 (2012) 4623-4631.

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