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Protactinium, Pa, was a nuclide which has the same characteristic such standard BP materials.
Hence, BP materials which added to fuel must have special characteristics.
First, the number of cross section absorption of BP materials must higher than fuel so BP materials could absorb faster from fuel burn up.
Protactinium, Pa, has the same characteristics such standard BP materials.
Materials composition in reactor core Figure 2.

The failure of self-lubricating bearings is primarily caused by the wear of self-lubricating materials, which lose its self-lubricating function finally.
The materials of the bearing are listed in Table 1.
Table 1 Materials of the spherical plain bearings Item Inner ring Outer ring Liner Material GCr15 20 steel PTFE/copper grid a b Fig.2 Structure of a spherical plain bearing The laboratory environment is room temperature and atmospheric pressure.
Li, Friction and wear behavior of a new 40Cr steel-PTFE fabric composite under heavy loads, Materials Science and Engineering 483-484 (2008) 365–368
Wasilczuk, Wear measurements of self-lubricating bearing materials in small oscillatory movement, Wear 263 (2007) 458-462

Swift ions create a defect profile penetrating deep into a solid compared to the sampling range of typical slow positron beams, which may consequently study a homogeneous zone of defected materials.
Positron annihilation (PA) spectroscopy has been extensively used to study implantation-induced defects in semiconductors and other materials.
Triftshauser, Materials Science Forum 262- 365 (2001) 529
Schaefer, Materials Science Forum 105-110 (1992) 1005
Schaefer, Materials Science Forum 175-178 (1995) 461

Micropitting failure is commonly observed in materials with high surface hardness and it is characterised by the removal of surface roughness asperities and the formation of cavities.
Details of gear parameters, material properties, lubricant properties are given in Al-Tubi and Long (2012) [14].
Errichello, Morphology of micropitting, The Journal of Gear Technology. (2012) 74-81
Luo, Modeling and analysis of transient contact stress and temperature of involute gears, Chinese Journal of Mechanical Engineering, 40 (8)(2004) 24-29
Long, Prediction of wind turbine gear micropitting under variable load and speed conditions using ISO/TR 15144-1: 2010, Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 227 (9) (2013) 1898-1914

Introduction Sewage diffusion is a new material which is used to marine environmental protection.
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Hydraulic journal.1993,6
Marine environmental Science. 2000,19（4）：41-45
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Introduction Electrical Discharge machining (EDM) is a non-conventional machining process to machine electric conductive materials independently of their mechanical properties.
Solid carbide WC-6Co was chosen as the workpiece material and copper was chosen as the electrode material.
Czelusniak et al., Materials used for sinking EDM electrodes: a review, J Braz.
Chakradhar, Failure detection and control for wire EDM process using multiple sensors, CIRP Journal of Manufacturing Science and Technology, vol. 33, pp. 315–326, (2021), doi: 10.1016/j.cirpj.2021.04.009
Yap, Supervised and Unsupervised Learning for Data Science.

Electrochemical machining (ECM) is well suited for materials that are difficult to machine.
Where η, I, F, and A are regarded as constant for the material.
Acknowledgements This study is supported by the National Science Council, contract NSC 101-2221-E-152 -002.
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Pa: Journal of Materials Processing Technology, Vol. 532-533 (2006), p. 965.

Materials and Methods Apatite powders were produced at pH 10 and pH 12 in order to allow the production of calcium phosphate with different hydroxyapatite to tricalcium phosphate ratio.
Gil, Journal of the European Ceramic Society (2005) v.25, p. 375-383
Thierry (1999), Journal of Materials Science: Materials in Medicine v. 10, p. 111- 120 [6] S.

Acknowledgments The authors are thankful to the Education Department of Henan Province of China for supporting this research under grant Science Research Project 2010A460012.
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Hsu: Journal of Materials Processing Technology Vol. 139(2003), p.127 [3] Y.
Guo: Key Engineering Materials, Vol. 359-360 (2008), p. 210 [6] X.
Yang: Applied Mechanics and Materials Vol. 10-12 (2008) , p. 621 [7] J.G.

Introduction With the rapid development of engineering and material science, the requirements of material performance have become more and more high.
The carbon fiber composite materials because of its unique and excellent performance, is widely applied in aerospace and other fields [1, 2]. 3D woven carbon fiber is the rapid development of a new type of fabric structure and is a kind of the whole fiber reinforced skeleton interwoven by the continuous fiber in three-dimensional space according to certain rule and form [3].
Mechanics of Materials, 2013, 62(14-31
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Textile Research Journal, 1999, 69(6): 389.