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School of Environmental Science and Engineering, Nanjing University of Information Science & Technology,210044 Nanjing, Jiangsu 2.
Materials and methods Sample collection and processing:Sludge samples were collected from 20 sewage treatment plant of 9 cities in Jiangsu province.After the collection of samples, samples were freeze-dried, ground, and homogenized by sieving through a stainless steel 75-mesh sieve and stored in aluminum foil bags at −20◦C until extraction.
Acknowledgements The financial support of teaching reform project of Nanjing University of Information Science & Technology are gratefully acknowledged.
Li:Acta Pedologica Sinica,Vol.11(1999),p.118 (in chinese) [8]X.X .Hu,Z.H.Han,B.Y.Liu : Environmental Science and Management,Vol.1(2007),p.37 (in chinese ) [9] Q.Y.
Zheng,Y.W.Zhou ,R.X.Hao:Journal of Of Beijing University Of Technology,Vol,5(2005),p.510(in chinese) [11] C.H.

In the soil mass of breakwater, earth material usually has some water permeability.
Acknowledgements This work was financially supported by the National Science and Technology Major Project of the Ministry of Science and Technology of China (2013ZX06002001-9).
Earth Science—Journal of China University of Geosciences.
Science Press, Beijing(2006)(in Chinese) [8] Harry M.Jol.: Ground Penetrating Radar Theory and Applications.
Elsevier Science(2009) [9] Chu,D.D.: Study on 2D-Numerical Simulation and Engineering Application of GPR Detection Technique in Hydraulic Engineering.

(Accessed on 29th August 2024, https://www.usgs.gov/special-topics/water-science-school/science/water-qa-why-cant-people-drink-seawater ) [7] Mechell, J.
Journal of Marine Science and Engineering, 9(4), 356
[11] Science Learning Hub, 2010.
In IOP Conference Series: Materials Science and Engineering (Vol. 1034, No. 1, p. 012068).

Secondly, there exists cut-throat competition between urban and rural industries in energy, raw materials and technology, which results in that factors of production cannot realize optimal allocation and it is difficult for urban capital, technology, human resources, managerial expertise and other factors of production to flow to rural areas.
In essence, city is the result of high aggregation of population, material, information, capital, knowledge and other social economic factors.
It should focus on landscape agriculture, experience agriculture, science popularization agriculture and so on.
Extractive industries refer to the industries that directly exploit raw materials, fuel from nature.
Quarterly Journal of Shanghai Academy of Social Sciences No. 2 (1987), p. 24~34, in Chinese

Experimental Procedure and Results Materials.
Fig. 6 Fracture toughness KIC and σB·r0 1/2 of several materials.
The experimental data for these materials are summarized in Table I.
The toughening mechanism is available for several materials, including dense and porous materials.
Awaji: Strength of Ceramic Materials.

Acknowledgments This research project was supported by the 111 Project of China (No.B07018), National 863 project (No.2009AA04Z301 and 2009AA043102), Specialized Research Fund for the Doctoral Program of Higher Education (No.20070213027), China Postdoctoral Science Foundation (No.20090450962), authors gratefully acknowledge their support.
Solar Energy Materials & Solar Cells.
Journal of Advanced Manufacture Technology.Vol.33(2007), p.961-967 [4] P.Couty, F.Wagner and P.Hoffmann.
Advanced Materials Research.

Study on Extraction of Total Flavonoids from Licorice with Ultrasonic Assistance and Antioxidant Activity Yuhong ZOU, Qiuxia HAN， lin GUO Shandong University of Science and Technology, Qingdao, Shandong 266510, China azouyh69@126.com, bhanqx@163.com,cgllin@126.com Keywords: RADIX RHIZOMA GLYCYRRHIZAE, Total flavonoids, Ultrasonic, Optimization, Free Radicals Abstract.
Materials and methods 1.1 Materials 1.1.1 Research objects.
References [1] Wang Lijuan.Journal of Northeast Forestry University. 2006,34,(5):70-72.

Given different media and the gasification conditions, low-grade biomass can be changed into high-grade gas as much as possible, as well as provide the raw materials for the production of ethanol [1-3].
Currently, there are two ways of producing ethanol, one is made by fermentation of sugar or starch materials, and the other is petroleum cracking of ethylene and ethylene hydrate to get it[4].
Acknowledgment Financial support by Xinmiao Talents Scheme of Zhejiang Province (grant No. 2011R405025), Ningbo Natural Science Foundation (grant No. 2011A610126), and the Talent Project of Ningbo University are gratefully acknowledged.
Vol.18 (2012), p.58 [6] Y.Y.Zhu, S.R.Wang, X.L.Ge, X.B.Li, J.S.Zhou, Z.Y.Luo: Journal of Zhejiang University Vol.45(2011),p341 [7] Y.Lu，D.C.Liu，S.A.Zheng: Acta Chim.

Stress characteristics analysis on a composite wind turbine blade Peng zhan Zhou1,a, Fang Sheng Tan1,b 1Key Laboratory for power technology of renewable energy sources, Hunan Province, Changsha University of Science & Technology, China azpz0731@163.com btanfangsheng@163.com Keywords： composite; wind turbine blade; stress characteristic；finite element method Abstract.
To meet the design demand of the large scale blade, the materials, strength, stiffness, weight, and other aspect of the blade laminate structure need be considered, thus a more accurate analysis of stress characteristics on the wind turbine blade is necessary.
Mezyk: Journal of Materials Processing Technology, Vol. 167(2005), p.463-471.

We can see from the figure 2(a), the cutting force amplitude has remarkable characteristics of stochastic volatility, which is mainly because the first deformation zone in the process of cutting shear slip of discontinuity and the random distribution work hard materials.
The international journal for manufacturing science and technology.2000,(2):101-106 [2] E.P.
[4]K.Thrimurthulu.optimum part deposition orientation in fused deposition modeling[J].Machine Tools &Manufacture,2002 [5]Yongnian Yan,Renjie Zhang,Guangdong Hong,Reasearch on the Bonding of Material Paths in Melted Extrusion Modeling[J].Material anf Design,2000