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The main materials of the company are woods, which are uncertain because the quantity of woods depends on environment, rainfall and sources of supply.
From Fig. 4, it can be seen that the availability of materials is extremely fluctuated comparing with demand, which causes unavailability in some period.
Ramer, in: Backorder fuzzy inventory model under function principle, Information Sciences Vol. 95 (1996), pp. 71–79 [6] D.
Mirko, in: Fuzzy models for the newsboy problem, International Journal of Production Economics Vol. 45 (1996), pp. 435–441 [7] T.K.
Tang, in: Optimization of the electrical discharge machining process based on the Taguchi method with fuzzy logics, Journal of Materials Processing Technology Vol. 102 (2000), pp. 48-55 [13] D.

[3] Weidong Guo, and Ranga Narayanan, Onset of Rayleigh–Marangoni convection in a cylindrical annulus heated from below, Journal of Colloid and Interface Science, vol 314, 2007, pp 727–732
Teamah, Numerical simulation of double diffusive laminar mixed convection in a horizontal annulus with hot, solutal and rotating inner cylinder, International Journal of Thermal Sciences, Volume 46, Issue 7, 2007, pp 637-648
Yahiaoui, Natural Convection of a Two-Component Fluid in Porous Media Bounded by Tall Concentric Vertical Cylinders, Journal of Applied Mechanics, Vol.73, 2006, pp 26-33
Roslan, Natural Convection Heat Transfer in Two-Square Duct Annuli Filled with a Nanofluid, Applied Mechanics and Materials, Vols. 773-774, 2015, pp. 299-303,
Corcione, Natural Convection of Nanofluids in Enclosures Heated Laterally and Underneath, Applied Mechanics and Materials, Vol. 737, 2015, pp. 301-312.

The blankholder is made of the material Toolox 33 from the company Hasco.
The surface of the sheet material was characterized before forming.
A separate calibration-curve is required for all material-lubricant combinations.
Groche, Advanced Friction Model for Cold Forging Processes, in: Steel research journal (2012), pp. 1003-1006, [18] J.
Ludwig, On the correlation between crytallographic grain size and surface evolution in metal forming processes, in: International Journal of Mechanical Sciences 52 (2010), 523-530 [21] I.

Fig. 1 Sampling Sites in Yellow River Delta Materials and methods Samplings collection After conducting a field survey during the mid November of 2009, 24 sampling sites were set in the areas with little human disturbance (Fig. 1).
The ANOVA method is widely used in sociological, experimental science and ecological field.
Journal of Geo-information Science 11 (1):91-97 [10] DeLoach CJ, Lewis PA, Herr JC, Carruthers RI, Tracy JL, Johnson J (2003).
Science Press, Beijing [38] Saito Y, Wei H, Zhou Y, Nishimura A, Sato Y, Yokota S (2000).
Journal of Anhui Agriculture Science 36 (13):5424-5426 [45] Elmore AJ, Mustard JF, Manning SJ (2003).

Enzinger1,c 1Graz University of Technology, Institute for Materials Science and Welding Kopernikusgasse 24, Graz 8010, Austria 2Stirzone OG, Plüddemanngasse 39, Graz 8010, Austria 3Graz University of Technology, Institute for Electron Microscopy and Fine Structure Research (FELMI), Steyrergasse 17, Graz 8010, Austria achristian.pfeiffer@stirzone.at, bthomas.weinberger@stirzone.at, cNorbert.Enzinger@tugraz.at, dhartmuth.schroettner@felmi-zfe.at, estefan.mitsche@felmi-zfe.at Keywords: FSW, friction stir welding, steel, stop action technique, microstructure Abstract Especially for aluminium and its alloys friction stir welding (FSW) has become an established welding process.
At the beginning of the development, research was mainly focused on low melting materials like aluminium alloys.
Because of the constant improvements and the advantages compared to conventional fusion welding processes, FSW has already been applied in the industrial production of aluminium parts and structures [2-4] These results led to increased efforts to use the process also for high melting materials.
H., and DebRoy T., Critical assessment: friction stir welding of steels, in Science and Technology of Welding and Joining. (2009), 14, pp. 193-196. 6 Sadrawetz F.
Journal of Materials Processing Technology. 2004, pp. 1681-1689.

Introduction Nowadays, natural fibers have been used as a reinforced fiber for composite materials because they need low processing energy, and have energy and carbon-credit recoveries at the end of life [1].
Experiment Materials and Samples Preparation.
This method is also suitable for composite materials.
[3] ASTM D 3379, Standard test method for tensile strength and young’s modulus for high-modulus single-filament materials, ASTM International, 1975 (Reapproved 1989)
Ansell, Mechanical properties of alkali treated plant fibres and their potential as reinforcement materials. i. hemp fibres, Journal of Materials Science 41 (2006) 2483-2496.

In order to grind these materials easily discontinuous grinding wheel is development, which its multi-porous grooves are formed during wheel manufacturing.
It is desirable to use the wheel grinding the materials in high accuracy and high efficiency, which is impossible by using general wheel.
Grinding these materials with general wheel now available is difficult due to their mechanical properties such as low hardness and high toughness, which result in wheel loading and grinding burning.
For this reason final precision machining for this kind of materials mainly depends on precision cutting, its machining result is difficult to reach demand of higher machining accuracy and better surface roughness.
In creep feed grinding, discontinuous wheel assembled by CBN sticks [3] has been used to grind fine ceramic etc. difficult-to-machine materials in high efficiency and high accuracy.

Wear resistance of a material is commonly represented by its hardness (Rockwell hardness HRC), especially hot hardness.
As mentioned earlier, hot work die steels (such as H13) have two contradictory material property requirements.
At elevated operating temperatures, toughness of the die material is appreciably higher than the room-temperature value.
References [1] Arif A.F.M., Sheikh A.K., Qamar S.Z., al-Fuhaid K.M., Modes of Die Failure and Tool Complexity in Hot Extrusion of Al-6063, Journal of Materials Processing Technology, 134 (3), 2003, p 318-328 [2] ASM International, ASM Metals Handbook Volume 1: Properties and Selection: Irons, Steels, and High-Performance Alloys, 10th edition, ASM International, 1990 [3] Totten GE (ed) Steel Heat Treatment Handbook: Volumes I and II, 2nd edition, CRC Press, Taylor and Francis Group, 2007 [4] Bryson WE, Heat Treatment, Selection, and Application of Tool Steels, 2nd edition, Hanser Gardner Publications, 2005 [5] ASM International, ASM Handbook Volume 4: Heat Treating, ASM International, 2006 [6] Hu X., Li L., Wu X., Zhang M., Coarsening Behavior of M23C6 Carbides after Ageing or Thermal Fatigue in AISI H13 Steel with Niobium, International Journal of Fatigue, 28 (3), 2006, p 175-182 [7] Rodenburg C., Rainforth W.M., A Quantitative Analysis of the Influence of Carbides Size Distributions
on Wear Behaviour of High-Speed Steel in Dry Rolling/Sliding Contact, Acta Materialia, 55 (7), 2007, p 2443–2454 [8] Qamar S.Z., Sheikh A.K., Arif A.F.M., Pervez T., Regression-Based CVN-KIC Models for Hot Work Tool Steels, Materials Science and Engineering A, 430 (1-2), 2006, p 208-215 

The material of workpiece is aluminum alloy 7050.
Acknowledgement: This project is supported by National Natural Science Foundation of China (50435020).
ASME Journal of Engineering for Industry, 1991, Vol. 113: 169-175
Constitutive model of aviation aluminum-alloy material in metal machining.
The Chinese Journal of Nonferrous Metals, 2005, Vol. 15(6): 854-859.

Thus, it makes BST and PZT which are usually applied in FRAMs prospective materials as anti-fuse dielectric.
Dielectric materials with lower breakdown electric field make a low programming voltage easier to obtain by adjusting the thickness.
However, further experiments are still needed to investigate the breakdown processes of different types of materials.
Proceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials" July 8-12, 1991 Tokyo, Japan
"High k Gate Dielectric and Materials Si Nanotransistor" Micronanoelectric Technology, 2006(3) [5] T.