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Calculation of Sound Radiation Power at Two Ends of Duct System Tao Fenga, Jing Wangb, Bin Liuc, Xue Wud and Nan Lie School of Material and Mechanical Engineering, Beijing Technology and Business University, Beijing, China,100048 afengtao@th.btbu.edu.cn, b wangj@th.btbu.edu.cn, cliubin@th.btbu.edu.cn, dwuxue@th.btbu.edu.cn, elinan@th.btbu.edu.cn, Keywords: calculation; sound radiation power; end of duct.
Acknowledgements The work described in this paper was supported by the National Natural Science Foundation of China (10974217) and the Research and Development Program of Science and Technology of Beijing Municipal Commission of Education (KM201010011008).
Zbroja: Journal of fluids and structures, Vol. 14 (2000), p. 529 [5] Ke Liu, Tao Feng: Proceedings of the inter-noise 2007, p. 146

Other metallic materials are unable to match this combination of properties at high temperatures.
These high temperature materials can be applied for the production of turbine blades and vanes castings for turbo-jets and stationary power plants.
Orlov: Deformation & Fracture of Materials Vol. 6 (2008), p. 43
Journal Plasticity Vol. 22 (2006), p. 2301
Kommel: Materials Science (Medžiagotyra) Vol. 15, No2. (2009), (In press)

Materials and methods Raw materials One kind of cement and three lithium admixtures are used for this investigation.
Construction and Building Materials, 24(2010) 1418-1423
Construction and Building Materials, 42(2013) 64-77
Effect of LiF on the performance of Cement Based Materials [J].
Journal of materials science and engineering, 23(2005) 120-123.

[9] ESD,EuropeanStrong-motion Database, http://www.isesd.cv.ic.ac.uk/ESD/frameset.htm [10] Cancellara, D., De Angelis, F., Pasquino, V., Displacement based approach for the seismic retrofitting of a RC existing building designed for only gravitational loads, Applied Mechanics and Materials, Vol. 166-169, pp. 1718-1729, 2012
Journal for Multiscale Computational Engineering, Vol. 5, n. 2, pp. 105-116, 2007
[14] De Angelis, F., Multifield potentials and derivation of extremum principles in rate plasticity, Materials Science Forum, Vol. 539-543, pp. 2625-2630, 2007
[15] De Angelis, F., Evolutive laws and constitutive relations in nonlocal viscoplasticity, Applied Mechanics and Materials, Vol. 152-154, pp. 990-996, 2012
[19] De Angelis, F., Cancellara, D., Implications due to different loading programs in inelastic materials, Advanced Material Research, Vol. 422, pp. 726-733, 2012

The keystone of ERP of the papermaking corporation is the logistic management, and the raw materials, finished product quality and quality traceability should fulfill very high management requirements, and the system should follow from the finished goods to semi finished articles and to material suppliers, so the ERP system must effectively help the corporation to follow the quality responsibility, and offer strong quality management and following function, and allow the corporation to follow the quality from the finished goods to raw materials.
Conclusions Nowadays, many problems such as small scale, numerous corporate quantity, shortage of raw materials, large resource and energy consumption, low technology, low production efficiency and serious pollution still puzzle the Chinese pulp and paper industry, and the critical reason is that the technology is lagged.
Acknowledgement This work was financially supported by the Key Laboratory of Pulp and Paper Science & Technology of Ministry of Education of China open foundation (KF2011006).
Journal of Northeastern University. (1999) Vol.20, No.2, P.137-139
Applied Mechanics and Materials, (2011) Vol.44-47, P.237-241

Materials and Methods The Table 1 shows the chemical composition of the specimen.
This introduces better properties of the material at the surface.
Series Materials Science and Engineering. 521 (2019) doi: 10.1088/1757-899X/521/1/012003 [3] R.
CheHaron, Machining-induced grain refinement of AISI 4340 alloy steel under dry and cryogenic conditions, Journal of Materials Research and Technology. 8 5 (2019) 4347-4353
Zhao, Influence of cutting velocity on gradient microstructure of machined surface during turning of high-strength alloy steel, Materials Science and Engineering A, 819 (2021) https://doi.org/10.1016/j.msea.2021.141354 [6] S.M.

Experimental Procedure Materials.
To prepare epoxy thermosets and test hardenability of the materials, ESO and commercial epoxy resin RenLam M were cured with maleic anhydride and hardener Ren HY-956, respectively.
American Society for Testing and Materials. 2011
Journal of Materials Science Vol.26 (1991), p. 839
Materials Science and Engineering: an Introduction. 4th ed.

Materials and Methods The rectangular flat samples of commercially pure titanium alloy (20×20×1 mm) were used for research.
Sakaki, Positron annihilation study of lattice defects induced by hydrogen absorption in some hydrogen storage materials, J.
Prokop’ev, Positron annihilation spectroscopy in materials structure studies, Phys.
Lider, Application of automated complex Gas Reaction Controller for hydrogen storage materials investigation, Adv.
Kansy, A new version of LT program for positron lifetime spectra analysis, Materials Science Forum. 1073, 666 (2010) 138-141

Introduction Iron and steel are important materials in this modern era as they are widely used in various industrial sector.
Materials and Method The raw materials used in this study are empty fruit bunch (EFB), collected at Malaysian Palm Oil Board (MPOB), Bangi and low-grade iron ore, collected from Pahang.
Y., Pyrolysis of Empty Fruit Bunches : Influence of Temperature on The Yields and Composition of Gaseous Product, American Journal of Applied Sciences. 11(4) (2014) 606–610
S., & Zakiyuddin, A., Phase Change of Iron Ore Reduction Process using EFB as Reducing Agent at 900-1200 ° C, IOP Conference Series: Materials Science and Engineering. 342 (2018) 1–7
Materials Chemistry and Physics. 101 (2007) 235-240.

Materials Today: Proceedings .43(2021) 2810-2813
Materials Letters.161(2015) 694-697
Materials Science in Semiconductor Processing.21(2014) 7-13
Materials Today: Proceedings, 52: 1733-1738(2022)
Journal of Materials Science: Materials in Electronics, 33(20), pp.16136-16143