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Heldner [6] argues that intensity is a reliable correlate of focal accent in the sense that there are statistically significant differences between focal and non-focal words for all words, in all positions and for all speakers in the analyzed materials, as well as in the sense that they are useful for automatic detection.
Acknowledgements This work was financially supported by the Social Science Research Project of Guangdong Province, Grant No.
GD11CWW04, as well as the Humanity and Social Science Research Project for Colleges in Guangdong Province, Grand No. 11WYXM012.
Xu, “Phonetic realization of focus in English declarative intonation,” Journal of Phonetics, 33, 159–197. (2005) [4] A.
White, “Structural influences on accentual lengthening in English,” Journal of Phonetics, 27(2): 171–206. (1999) [5] Y.

Reverse logistics networks designed by previous literatures did not consider the reuse of recyclable materials and environmentally friendly processing of hazardous substances.
Decision variables: Xj: 1,if sorting center is opened at location j,0,otherwise; Yk: 1,if recycling plant is opened at location k,0,otherwise; Zp: 1,if harmless processing center is opened at location p,0,otherwise; xij: quantity of solid wastes shipped from recycle bin i to sorting center j; xjk: quantity of recyclable materials shipped from sorting center j to recycling plant k; xjl: quantity of solid wastes shipped from sorting center j to incineration plant l; xjm: quantity of solid wastes shipped from sorting center j to landfill m; xjn: quantity of solid wastes shipped from sorting center j to composting site n; xjp: quantity of injurant shipped from sorting center j to harmless processing center p; xkm: quantity of solid wastes shipped from recycling plant k to landfill m; xkr: quantity of useful materials shipped from recycling plant k to factory r; xlm: quantity of solid wastes shipped from incineration plant l to landfill m.
Acknowledgements This work is supported by MOE (Ministry of Education in China) Project of Humanities and Social Sciences under Grant 09YJC630152, Innovation Program of Shanghai Municipal Education Commission under Grant 13YZ138 and the Leading Academic Discipline Project of Shanghai Dianji University under Grant 10XK01.
References [1] Kai Ma: To promote the development of circular economy (People's Daily, Beijing 2004), In Chinese [2] Zhujun Ma, Ying Dai: Journal of Industrial Engineering and Engineering Management Vol. 19(2005), p. 114, In Chinese [3] Qingli Da, Zuqing Huang, Qin Zhang: Chinese Journal of Management Science Vol. 12(2004), p. 131, In Chinese [4] Weimin Di, Pei Hu: Chinese Mechanical Engineering Vol. 18(2007), p. 2840, In Chinese [5] Fleischmann M, Jacqueline M B, Dekker R, et al: European Journal of Operational Research Vol. 103(1997), p. 1 [6] Listes O, Dekker R: European Journal of Operational Research Vol. 160(2005), p. 268 [7] Bo He, Chao Yang, Hua Zhang and Yongdong Shi: Systems Engineering Vol. 24(2006), p. 38, In Chinese [8] Bo He, Chao Yang and Jun Yang: Industrial Engineering and Management Vol. 5(2007), p. 43, In Chinese [9] Zheng Huang: Systems Engineering Vol. 27(2009), p. 49, In Chinese [10] Xiaoyong Fu, Cheng Liu, Yulan Huang: Operations Research and Management
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Two pairs of tube and tubesheet materials were used in present finite element analysis.
The stress-strain curves of materials SA-803TP439 and SA-350LF2 are shown in Fig. 3.
The stress-strain curves of materials 10# and 16Mn are taken from reference [4] shown in Fig. 4.
And Table 1 shows the material properties of the above four materials.
Sang, G.E.O.Widera, Connection strength and tightness of hydraulically expanded tube-to-tubesheet joints, Journal of Materials Processing Technology,2007,194: 93–99 [5] T.Xie, XP.Huang, ZY.Fu, Determination of Expanding Pressure of Hydraulically Expanded Tube-to-Tubesheet Joint, Advanced Material Research, 2010, 97-101: 2898-2902.

Segal: Materials Science and Engineering Vol.
Clausen: Materials Science and Engineering Vol.
Wang: Materials Science and Engineering Vol.
Estrin: Materials Science and Engineering Vol.
Kim: Materials Science and Engineering Vol.

Introduction Cold Spray or Supersonic particle Deposition (SPD) is a coating technology was initially developed in the mid-1980s at the Institute for Theoretical and Applied Mechanics of the Siberian Division of the Russian Academy of Science in Novosibirsk [1].Cold spray is a technology in which metal, composite or polymer powder particles in a supersonic jet of compressed gas impact a solid surface with sufficient energy to cause plastic deformation and bonding with the underlying material without the creation of heat affected zones which are typical of other deposition processes (thermal spray) and which are undesirable in many structural applications [1].
Rotor blades are made out of various materials, including aluminum, composite structure and steel or titanium with abrasion shields along the leading edge.
For propeller blade repair, if using doubler method, doubler of the same type material must be used and one gauge thicker than the surface to be repaired.
Pitt,On the use of supersonic particle deposition to restore the structural integrity of damaged aircraft structures, International Journal of Fatigue, Vol 33, (2011), pp 1257-126
[2] M.Grujicic, Z.L.Zhao, W.S. deRosset, D.Helfritch, Adiabatic Shear Instability based Mechanism for Particle/substrate bonding in the cold-gas dynamic-spray process, Materials & Design 25, (2004) pp. 681-688

Zhou: Materials Science & Engineering A, 553 (2012) 51-58
Dong: Materials Science & Engineering A, 527 (2010) 1215-1222
Kumar: Journal of Materials Processing Technology, 88 (1999) 284-294
Li: Materials & Design, 97 (2016) 118-125
Brada: Journal of Materials Processing Technology, 213 (2013) 1364-1369.

As a result of this prohibition, some of the processes in which N. flagelliforme is utilized as an indispensable material are severely baffled.
Materials and Methods Microorganisms.Colonies of Nostoc flagelliforme that naturally grew in the field were collected from the eastern side of the Helan Mountain in Yinchuan, Ningxia, China.
Ecology of the terrestrial alga Nostoc flagelliforme Berk. et Curt. in China Journal of Applied Phycology, 1991, 27(Suppl): 45
Journal of Applied Phycology, 1998 10: 37–49
Review of Nostoc flagelliforme research, Journal of Ningxia University (Natural Sciences) , 1992, 13(1):71–76 (in Chinese with English abstract)

Metallurgical and Materials Engineering 26 (1) (2012) 87-102
Thermal Science and Engineering Progress. 20(2020) 100739
Jamiatia, Effect of differentially heated tubes on natural convection heat transfer in a space between two adiabatic horizontal concentric cylinders using nano-fluid ,International Journal of Mechanical Sciences. 163(2019) 105148 [24] M.I.
Said, Effects of fins geometries, arrangements, dimensions and numbers on natural convection heat transfer characteristics in finned-horizontal annulus, International Journal of Thermal Sciences.137(2019) 121-13
Farhadi, Effect of radial fins on two-dimensional turbulent natural convection in a horizontal annulus, International Journal of Thermal Sciences. 43 (2004) 255–264.

These physical hazards are caused by the use of machinery, equipment, materials, and environmental conditions around the workplace.
For instance, painting or finishing materials containing toxic substances and irritants can lead to respiratory problems.
Further research by Kowalik et al. [37] indicates that there are two main sources of potential chemical risk directly from the materials used at the building site.
The second group comprises ready construction materials produced from potentially harmful substrates.
Balkhyour, “Occupational accidents and injuries in construction industry in Jeddah city,” Saudi Journal of Biological Sciences, vol. 27, pp. 1993–1998, 2020

Experimental Materials and mix proportion.
FDN admixture is supplied by jianbao new building materials corporation in Guangzhou province, PR China.
Peak strain is another important index that shows mechanical property of materials.
Li: New Chemical materials.
Xu: Journal of the Chinese Ceramic Society.