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All the following example study three-span continuous bridge beam, physics geometric parameters of the beam are: modulus of elasticity E=2x1011N/m2, material density r=7800kg/m3, beam spans length l1=l2=l3=l=30m, height and width of cross section h=1m;b=0.3m.
Pierre, Natural modes of Bernoulli-Euler beams with symmetric cracks, Journal of Sound and Vibration (1990) 138(l), 115-134
DIMAROGONAS, A continuous cracked beam vibration theory, Journal of Sound and Vibration (1998) 215(1),17-34 [8] E.
DIMAROGONAS, Vibration of a beam with a breathing crack, Journal of Sound and Vibration (2001) 239(1), 57-67 [10] H.
Chang, Free vibration analysis of multi-span beams with intermediate flexible constraints, Journal of Sound and Vibration 281 (2005) 155–169 [12] Hai-Ping Lin, Shun-Chang Chang, Forced responses of cracked cantilever beams subjected to a concentra ted moving load, International Journal of Mechanical Sciences 48 (2006) 1456 – 1463 [13] N.

Materials and Methods Materials.
IOP Conference Series: Materials Science and Engineering. 872 (2020) 012087
Materials Today: Proceedings. 44 (2021) 987-993
Materials Science & Engineering R-reports - Mat Sci Eng R. 49 (2005) 61-87
[9] Gros, X., Current and Future Trends in Non-Destructive testing of Composite Materials.

Introduction Composite is a combination of two or more materials that helps to increase the properties [1].
Therefore, more rational uses of wasted sugarcane are recommended for instance, reinforcing sugarcane in composite materials.
Experimental Method Materials.
Wada, Wax, policosanol, and long‐chain aldehydes of different sugarcane (Saccharum officinarum L.) cultivars, European Journal of Lipid Science and Technology, 114(5) (2012) 583-591
Nordin, K.A Halim, Sugarcane Bagasse Reinforced Polyester Composites: Effects of Fiber Surface Treatment And Fiber Loading on The Tensile And Flexural Properties, InIOP Conference Series: Materials Science and Engineering, 957(1) (2020) 012032

Materials and methods 2.1Experimental setup The study of this WWTP locates in the south China with a service area of 20km2 and serves population of 240 thousand.
China Science Press, Beijing, 2010.6 (in Chinese) [4] Huihuang Shao, Xianjin Fang.
Chinese Journal of Environmental Engineering, Vol.2(2008),p.1053-1056(in Chinese) [10] Carlos Mu˜noza, Daniel Rojasa.
Chemical Engineering Journal, Vol. 145(2009),p.453–460 [11] C.M.Chung,K.W.Cho,Y.J.Kim.
Bioprocess Bisoys Eng, Vol. 35(2012),p.503-511 [12] Mao-cai LI.Journal of Kunming University of Technology, Vol.34(2009),p.75~78(in Chinese)

The basic data of index calculation is mainly got from Marine Statistical Yearbook of China (2002-2012) [11], Fishery Statistics Yearbook of China (2002-2012) [12], Communique of State Oceanic Administration and Statistical Yearbook of Shandong (2002-2012) [13], as well as statistical yearbooks of 7 coastal cities [14] and related literature materials.
Evaluation of Marine Resources and Environment Basis of Marine Economy in Coastal Cities of Zhejing.Journal of Zhejiang Ocean University (Natural Science).
Journal of Applied Statistics and Management .Vol.30(1), (2011),p.98-106 [5]Olivier Thébaud, Luc Doyen and James Innes.
Comparing Several Methods of Assuring Weight Vector in Synthetical Evaluation.Journal of Hebei University of Technology.
Study on Assessment Model of Coastal Zone Sustainable Development and Its Application :A Case Study of Guangdong Province, South China[D].Guangdong Province: Chinese Academy of Sciences.(2007) [16]Zhang Weimin.

However, with the development of science and technology, people re-examine aluminum for the harm to human body, after the domestic and foreign scholars on the toxicity of aluminum in-depth research, concluded that: the toxicity of aluminum can not be ignored [5].
Materials and Methods A.Samples All samples were collected by authors as a consumer, and came from canteens, bread houses and the breakfast shop, a certain sand supermarket, a certain supermarket, a certain base stores, certain department stores around schools.
Nusrat, et al, “Evaluation of aluminum contents in different bakery foods by electrothermal atomic absorption spectrometer,” Journal of Food Composition and analysis, vol. 20, pp. 226-231, 2007
Zhang, “The toxicity of Aluminum (review)”, Chinese Journal of Food Hygiene, vol. 10, no. 4, pp. 31, 1998
Yamada, “Comparative hepatotoxicity of aluminum administered with maltol and kojic acid to mice,” Japanese Journal of Toxicology and Environmental Health, vol. 42, pp. 241-247, 1996

In standard of GB/T 15706 (equal to ISO 12100) machinery is defined as: assembly of linked parts or components, at least one of which moves, with the appropriate machine actuators, control and power circuits, jointed together for a specific application, in particular for the processing, treatment, moving or packaging of a material.
Security research focuses on the impact of the accident of the structure, function and material characteristics of the product, but not combine of person and management on the accident.
China Safety Science Journal, 2004, (5):96-98
China Safety Science Journal, 2010, (1):77-83
China Safety Science Journal, 2004, (4):58-60

C Girder type C Distance from coast N Girder material C Acid rain C Pier type C Avg. yearly rainfall N Pier material C Peak monthly rainfall N Pier foundation C Avg. rainy days per year N Abutment type C Max. rainy days in a month N Abutment foundation type C Soil profile C traffic factors Traffic volume N 1.2 Code conversion of factors 1.2.1 Code conversion of categorical factors There are many discrete factors in the bridge damage factors.
Acknowledgements This paper is supported by the National Natural Science Foundation of China (No.50908184) and China Postdoctoral Science Foundation (No.20100480887), which are gratefully acknowledged.
International Journal of Computing and Information Science. 1982. 11:341-346
Journal of Vibration and Shock.2008, 27(3): 50-56.
Journal of computer applications, 2009, 4:1102-1105.

Materials and methods In this research, an assessment model based on EF and EC was used to detect the trend of urbanization in Tangshan city.
[2]M.Ma, Z.Lu, Y.Sun: International Journal of Sustainable Development & World Ecology Vol.15(2008),p.326-330
[4]M.Wackernagel, N.B.Schulz, D.Deumling: Proceedings of the national Academy of Sciences Vol.99( 2002),p.9266-9271
[6]M.Zhang, F.Tan, Z.Lu: International Journal of Sustainable Development & World Ecology Vol.21(2014),p. 465-470
[7]J.Zhao, L.Xiao,L.Tang: International Journal of Sustainable Development & World Ecology Vol.21(2014),p.361-368.

Materials and Method Extraction of Volatile Compounds.
Baharun, Study on suitable habitat for swiftlet farming, Journal of Civil Engineering, Science and Technology 1(1) (2009) 1-7
Zukefli, A comprehensive review of edible bird nests and swiftlet farming, Journal of integrative medicine 14(6) (2016) 415-428
Ismida, Overview of technologies used in swiftlet housing, Malaysian, Journal of Veterinary Research 10 (2019) 51-55
Marchlewska-Koj, Adrenal-mediated endogenous metabolites inhibit puberty in female mice, Science 231(4739) (1986) 722-725