In this paper, we study the following nonlinear fractional Schrödinger-Poisson system (-) s u + V(x)u + φu = K(x)f (u), x ∈ R 3 , (-) t φ = u 2 , x ∈ R 3. (0.1) where s ∈ (3 4 , 1), t ∈ (0, 1), V, K : R 3 → R are continuous functions verifying some conditions about zero mass. By using the constraint variational method and the quantitative deformation lemma, we obtain the existence of least energy sign-changing solution to this system.

Several urban agglomerrations have formed in China in different size recently, with China's population and ecnomic activities shifting to big cities at large scale, becoming important driving force of economic development. Yangtze River Delta, Pearl River Delta and Beijing-Tianjin-Tangshan Area in terms of high speed of economic development and economic contribution rate are called China's three major urban agglomerations.This article aims to illustrate construction of three major agglomerations and in particular the main advantages and weaknesses.Keywords: Urban agglomeration, Advantages, Weaknesses The construction of three major urban agglomerationsYangtze River Delta, Pearl River Delta and Beijing-Tianjin-Tangshan Area are three areas with economic development at fast speed. Yangtze River Delta includes Shanghai, Nanjing, Hangzhou, Ningpo, Wuxi, Suzhou, and Zhenjiang, among which Shanghai is the core city and play the most important role. Pearl River Delta is composed of Guangzhou, Shenzhen, Zhuhai, Fuoshan, etc. Beijing-Tianjin-Tangshan Area comprises Beijing, Tianjin, Tangshan and the middle region of Liaoning, Hebei, Shandong ,Inner Mongolia provinces. Advantages of three major major urban agglomerationsYangtze River Delta, Pearl River Delta and Beijing-Tianjin-Tangshan Area, with its competitive position, achieve impressive economic aggregates comparing to other regions, especially in the field of industrial production,foreign direct investment,volume of importation and exportation,and total number of retail of consumer goods. Common adavantages of major three major urban agglomerations 2.1.1Advanced infrastructure and traffic networkIn Yangtze River Delta, Many high speed roads which connect Shanghai and Ningpo,Shang hai and Hangzhou,Ningpo and Hangzhou have been estabished and been used.Besides, Yangtze River Delta is closed with some international shipping deepwater ports of East Oceon,Yellow Ocean and Yangtze River,together with other ordinary ports nearby,forming a developed distribution and transportation system with fast speed and professional coordination.At the same time,better strategy for infrastructure construction in Pearl River Delta has been formulated.That is the establishment of high speed road network centered by Guangzhou. Beijing-Tianjin-Tangshan Area is featured with more than forty ports with different scale.All of its ports have made up of a port agglomeration with sound function,cargo throughput of which account for 40% of the total aggregate in China. Skillful talent and high technologyA great number of outstanding universities and high technological institutions make sufficient professional and skillful experts available.They have successed in many essential researchs and brought with high qualified technical productions,particularly,they pioneer in the areas of microelectronic system,optical fibre,bio-engineering and new material. Beijing-Tianjin-Tangshan Area is also an important region of science and technology research.,providing favorable conditions for developing t...

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