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Study on the secondary city, spatial expansion model of unifying adjacent cities Zhouchao1,2,a 1 Huaiyin Institute of Technology, School of Civil Engineering, Huai’an Jiangsu, 223001, China; 2 Department of Urban and Resource，Northwest University，Xi’an 710069, China; azhouchaokk@163.com KEY WORDS: Unifying adjacent cities; The secondary city; Spatial expansion; Model ABSTRACT: Urban spatial structure that is a comprehensive reflection of the interaction between human activities and natural factors, is the internal driving force mechanism for sustainable urban development.
In the city of the neighboring cities, the secondary city' scale effect expand and its space expand outwards, because of some features of the main city of the transfer, but often there are some limiting factors, such as natural geographic environment system, the urban economic development, urban internal structure, the restrictions of administrative divisions, etc, constitute to the secondary city's space expand threshold, limit its space expansion outward to a certain extent; Geographical constraints--Restricting Spatial effect: Natural and geographical restrictions conditions of the city is an important element of the threshold line of urban expansion, although the scientific and technological advances have greatly this threshold line may be a breakthrough, but require substantial economic investment, high resource-consuming; Restriction administrative divisions--Hinder the development and construction of the secondary City: In the city of, the main city is always in the leading position
Southern Forum, 02. 32-38, (2010), In chinese

It is necessary to take the interaction of welding induced residual stresses and external loads into account to assess the integrity of an engineering structure, because the interaction can have significant effects on the susceptibility of a material to cold cracking, stress corrosion cracking and fatigue failure [2].
[6] Kannengiesser, T., et al., Residual stresses and in-situ measurement of phase transformation in low transformation temperature (LTT) welding material, 2009, Advances in X-Ray Analysis, p. 755-762
[13] Kromm, A., et al., In-situ observation of phase transformations during welding of low transformation temperature filler material, 2010, Materials Science Forum, Vol. 638-642, p. 3769-3774

In Tangail, Kushtia, Cox's Bazar, and other locations, the Local Government Engineering Department (LGED) has also installed a number of 27ft high wind pumps with a power of 0.5hp (385W) at a wind speed of 4m/s.
The authors also discuss recent advances in solar energy technology and future prospects for the industry [15].
Modeling the Potential Impact of Climate Change on the Natural Resources of the Coastal Region of Sundarban Ecosystem in Bangladesh, Proceedings on 17th CTWF September 17-19, 2018 in China CAS-TWAS-WMO Forum, (2018)
International journal of precision engineering and manufacturing-green technology, 1, (2014) 157-173
International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering, 4(12), (2015) 506-9512.

Introduction Glasses are extensively studied due to their special properties such as hardness, good thermal and mechanical strength, high transparency, high corrosion resistance, etc. that make them potential candidates for various applications, especially in technological and engineering fields.
El-Diasty, One-photon band gap engineering of borate glass doped with ZnO for photonics applications, J.
Culea, FTIR spectroscopic study of Gd2O3-Bi2O3-B2O3 glasses, Journal of Optoelectronics and Advanced Materials. 10(9) (2008) 2416 – 2419
Babilas, Preparation Structure and properties of Fe-based bulk metallic glasses, Journal of Achievements in Materials and Manufacturing Engineering. 40(2) (2010) 123-130
Poulain, Glass forming ability criterion, Materials Science Forum. 19 (20)(1987) 11-18

A DCT-based Blind Watermarking Algorithm for Vector Digital Maps WANG Xun1, a, HUANG Ding-jun1, b, ZHANG Zhi-yong1, c 1 College of Computer Science & Information Engineering, Zhejiang Gongshang University, Hangzhou, China a wx@mail.zjgsu.edu.cn, bhuangdingjun@163.com, czzy@mail.zjgsu.edu.cn Keywords: vector map; digital watermarking; DCT; Double Error Estimation Abstract.
To fine control the watermarking distortion, a new error estimation method is designed to predict the distortion in advance, which eliminates watermarking distortion that is bigger than the preset threshold.
Takahashi, A frequency-domain approach to watermarking 3D shapes, Computer Graphics Forum 21(3), pp.1-10, 2002 [10] VOIGT M, YANG B ,BUSCH C.

In: Knowledge Engineering and Management Advances in Intelligent and Soft Computing[C] Volume 123, 2011, 427-434
Topic Detection over Online Forum[A].

Pivsa-Art in: A study of shelf-life of commercial bioplastics in real weather condition, 12th Eco-Energy and Materials Science and Engineering Symposium, [3] Rattikarn Khankrua, Sommai Pivsa-Art, Hamada Hiroyuki, Supakij Suttiruengwong, Effect of chain extenders on thermal and mechanical properties of poly(lactic acid) at high processing temperatures: Potential application in PLA/Polyamide 6 blend, Polymer Degradation and Stability, Volume 108, 2014, Pages 232-240, [4] Khankrua, R., Pongpanit, T., Paneetjit, P., Boonmark, R., Seadan, M., & Suttiruengwong, S. (2019).
Materials Science Forum, 1015, 89–93
Huang, et al., New insights into the role of chitosan oligosaccharide in enhancing growth performance, antioxidant capacity, immunity and intestinal development of weaned pigs, RSC Advances. (2017), 10.1039/c7ra00142h [8] C.S.

Analytical and Experimental Evaluation of the Stress-Strain Curves of Sheet Metals by Hydraulic Bulge Tests Lucian LĂZĂRESCU1, a, Dan-Sorin COMŞA1,b and Dorel BANABIC1,c 1Technical University of Cluj-Napoca, Department of Manufacturing Engineering, B-dul Muncii nr. 103-105, 400641 Cluj-Napoca Romania alucian.lazarescu@tcm.utcluj.ro, bdscomsa@tcm.utcluj.ro, cbanabic@tcm.utcluj.ro Keywords: Hydraulic bulge test, analytical approach, flow stress.
The development of the computers and data acquisition systems made possible important advances in the field of sheet metal testing.
Banabic: Material Science Forum Vol. 442-443 (2004), p. 139

Forum Vol. 587-588 (2008), p. 966-970 [3] L.G.
Warnecke in: Advances in ultrahard materials application technology, edited by P.
Friemuh: Cutting Principles, Wear and Applications of Diamond Tools in the Stone and Civil Engineering Industry, in Proc. of the Int.

Advances in Colloid and Interface Science. 209 (2014) 172-184
Journal of Environmental Chemical Engineering. 5 (2017) 391-399
Materials Science Forum. 898 (2017) 1885-1891