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Munirova, Mechanical modelling of the universal superplastic curve, Journal of Materials Science 35 (2000) 2455 – 2466
Khraisheh, A new combined experimental–numerical approach to evaluate formability of rate dependent materials, International Journal of Mechanical Sciences 66 (2013) 55-66
Chang, Material Models for Simulation of Superplastic Mg Alloy Sheet Forming, Journal of Materials Engineering and Performance 19(4) (2010) 488-494
Liew, Three-dimensional modeling and simulation of superplastic forming, Journal of Materials Processing Technology 150 (2004) 76–83
Jun, A Mechanical Analysis of the Superplastic Free Bulging of Metal Sheet, Materials Science and Engineering 84 (1986), 111-125

The theoretical basis for solving this urgent problem is the transdisciplinary science of geonics (geomimetics).
Volodchenko, Development composition of thermal insulation materials autoclave curing based on clay raw materials, Bulletin of BSTU named after V.G.
Nakhaev, Composite Binders with the Use of Fine Raw Materials of Volcanic Origin, International journal of environmental & science education. 11 (18) (2016) 12711-12716 [7] N.I.
Suleymanov, The influence of technological factors on the basic properties of vibropressed concrete paving slabs, Research Journal of Applied Sciences. 9 (11) (2014) 874-878 [9] A.A.
Zagorodnjuk, Improving the efficiency of wall materials for «green» building through the use of aluminosilicate raw materials, International Journal of Applied Engineering Research. 10 (24) (2015) 45142-45149

[3] Bajaj, P., Fire-retardant materials, Bulletin of Materials Science, 15 (1992) 67-76
Kumar, Structural, thermal, dielectric studies on sol–gel derived MgO from non-alkoxide route, Materials science and technology, 22 (2006) 1249-1254
Wilkie, Fire retardancy and morphology of layered double hydroxide nanocomposites: a review, Journal of Materials Chemistry, 22 (2012) 18701
[60] Maitra, S., et al., Effect of compaction on the kinetics of thermal decomposition of dolomite under non-isothermal condition, Journal of Materials Science, 40 (2005) 4749-4751
Levchik, A review of current flame retardant systems for epoxy resins, Journal of fire sciences, 22 (2004) 25-40

Therefore, clinical materials science, among other things, studies the interaction of materials and the human body (a patient and a doctor).
These materials are called biocompatible.
Types of dental biocompatible materials: 1.
Journal of Traumatology and Orthopedics. 2003.
Osteoinductive molecules in orthopaedics // Basic science and clinical studies. 2002. № 395.

Planting groups with weight of added materials and seeds No.
Fig. 5. pH values before and after adding materials.
EC measurements before and after adding materials.
Concentration of SO4 before and after adding materials.
Wittayakun, Synthesis and characterization of zeolite LSX from rice husk silica, Suranaree Journal of Science and Technology. 14 (2007) 367

As we know, bush-burning is one of the main forms of the engine failure or even damage due to the Inadequate supply or partial lack of oil between crankshaft main journal and crankshaft bearing as well as the rod journal and rod bearing in a high temperature and high speed working environment.
Using the default solver of FLUENT, and setting the operating pressure to a standard atmospheric pressure, without considering the acceleration of gravity, choosing engine oil from FLUENT material library as the fluid, setting the initial temperature to 25℃, taking the energy equation into consideration and based on SIMPLE algorithm, then conduct the flow field simulation.
Compared to the flow field of the clearance between rod journal and bearing shell, the effective flow cross-sectional area is enlarged because of the tank between the crankshaft main journal and bushing, so that the overall average oil flow velocity becomes larger, majority of the oil flows directly along the tank with little from the major arc.
Acknowledgements The authors gratefully acknowledge the financial support from the National Natural Science Foundation of the P.
[4] Yong Li, Zhiyou Liu and Yijie An: submitted to Journal of Hydrodynamics, 2001, 16(2): 254-258, in Chinese.

Main Thermal Insulation Materials 2.1 Obstructive insulation materials The application of the composition of low thermal conductivity is a basic form of developing obstructive insulation materials.
Currently, inorganic mineral insulation materials were low cost and widely used in barrier insulation materials.
Hemberger: International Journal of Thermal Sciences, Vol. 50(2011), p. 1838 [9] M.
Du: International Journal of Thermal Sciences, Vol.48 (2009), p. 1302 [11] Z.J.
Ng: Materials Science and Engineering: B, Vol. 132(2006), p. 209 [21] M.A.

With the greatly extended of the biodegradable polymeric materials’ application domain, the research of polymeric materials’ degradation process is getting more concerned.
Biodegradable polymeric materials degradation model is advanced under this background to simulate and forecast the polymeric materials’ degradation process, then overcome difficulties via computer-aided design.
Biodegradable Polymer Materials’ Degradation Model At present the study on polymer materials’ biodegradation process is focused on chemical hydrolysis of the polymer backbone.
Molecular degradation of polymer materials changes over degradation time.
Establishment of Parameters Optimization Model The degradation model of biodegradable polymer materials simulates the degradation process of polymer materials by computer and the simulation results should be consistent with the experimental data.

This paper summarized the research status methods and distinguishing features of fireproof materials in China which would make progress to our research on fireproof materials.
According to the literature on fireproof materials recently, the research of fireproof materials divide into three directions approximately: the classes of fireproof materials, the principle of fireproof materials and the special applications of fireproof materials in different fields[1]. 1.1 The research on class of fireproof materials classified various materials which include HPL(Pecorative high-Pressure Lcminate), fire resistant doorsets, fire-resisting wood windows, fire roller shutter, Anti-fire Glass, fireproof storage box, fire-retardant coatings and fire-proof sealing materials. 1.2 The research on the principle of fireproof materials analyzed the flameproof procedures based on principle and prevention measures for preventing even holding back fires though experimentations and theoretical analysis[2]. 1.3 The applied research of dedicated fireproof materials studied the application of fireproof materials in different situation.
The production of these materials would be green environmental.
References [1] Chao Yan.The Research Status of Fireproof Materials at Home and Abroad[J].Security and Safety Technology Magazine,2010(5) [2] Zejiang Zhang,Lun Zhou,Wenhua Zhang,Bin Lan and Feng Li.Study of sprayed fire-resistive material[J].Fire Science and Technology,2006,25(2) [3] Ruoyu Fu,Xuejun Liu,Shichao Zhang Caijun Xian and Baowen Guo.Application of Nano-SiO2 in Fire Resistive Coatings for Steel Structures[J].Journal of Materials Science and Engineering, 2005,23(2) [4] Shupeng Gao.Study on application of single fire-resisting glass plate structure system to building curtain wall[J].New Building Materials,2006(2) [5] Yintao Liu,Jian Li and Qingwen Wang.Study on the Properties of FRW Fire-retardant Plywood of Betula[J].China Forest Products Industry,2004,31(3) [6] Yu Wu.Properties Test on Fire Retardant Plywood[J].China Wood Industry,2002,16(4) [7] Fang Dong,Zhangkang Wu and Shiyou Li.Effects of Fire Retardant Treatment on Properties of Pinus kesiya var.langbianensis Plywood
[J].Journal of Southwest Forestry College,2007,27(6) [8] Hongyan Liu,Li Wang,Wei Yi,Chengfan Liu and Honglin Yu.Making Use of Calcium Carbide Slag to Synthesize Calcium Silicate Thermal Insulation Materials[J].Research and Exploration in Laboratory,2010,29(1) [9] Guowei Song and Hui Liu.Application of Red Mud in Microporous Calcium Silicate[J].

Badawia Faculty of Science, Physics Department, El-Minia University, Egypt aemadbadawi@yahoo.com Key words: 2024 Alloy, Activation Energy, Electrical Measurements, Isothermal Annealing, Positron Lifetime Technique Abstract Positron annihilation lifetime (PAL) measurement is one of the most important nuclear techniques used in materials science.
Electrical measurements are also used in materials science.
Stott: Canadian Journal of Physics, 52 (1974) 759 [8] W.
Badawi, Journal of Materials Science and Engineering, 5[3] (2011) [16] W.
Brown: Journal of Applied Physics, 22 (1951) 1012 [17] I.