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Taking as the starting point an undirected source network and a set of possible new links that can be used to extend the source network, a method is proposed to determine, by simple inspection of a matrix tableau, all shortest distances in any extended network, without using a shortest path algorithm. In consequence, this method may be a useful tool for analyzing and judging network extensions. In particular, computation time can be saved in many complex network optimization methods that use shortest path algorithms. The computer experiments show that the method is feasible even when an extended network may differ from the source network by several dozens of branches.  相似文献   
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The concept of formalization has long underpinned policy interventions and measures intended to connect informal entities with state institutions or formal economic structures. However, despite the policy enthusiasm, the outcomes of formalization policies have frequently been disappointing. This article argues that this disconnect lies in the concept of formalization itself and that common approaches to formalization are often rooted in three conceptual fallacies: a binary distinction between formal and informal economic actors, a lack of appreciation for the diversity of informal economic actors and the idea that ‘becoming’ formal necessarily spurs positive externalities. These conceptual confusions pay insufficient attention to contextual complexity and the political and social dynamics that shape informality in a given context and they are frequently rooted in the practicalities and power structures that shape knowledge creation in this area. This article demonstrates this through case studies of tax registration and property titling. Thus, it argues for a new research agenda on formalization that challenges both its conventional conceptual foundations and the practices of research that engage with it.  相似文献   
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James the Great, son of Zebedee and brother of St John, was one of the three Apostles privileged to accompany Jesus on special occasions like the Transfiguration and the Agony in the Garden of Gethsemane. He was beheaded in 42 AD by order of Herod. His connection with Spain is here the subject of critical enquiry, and it is demonstrated that there is virtually no evidence at all to substantiate the belief that his mortal remains lie in Spain, at Santiago de Compostela, which became one of the most important pilgrimage centres of the medieval West; nor indeed that he ever preached in Spain or visited that country. It is only in the ninth century that sources begin to mention the discovery of James' burial-place in Spain, while from the seventh century his preaching in Spain is mentioned. From about 800 the legend of St James in Spain took root in Latin Christian tradition.  相似文献   
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This article aims to develop our understanding of Arab women's spatiality. It highlights the effect of the embedded culture and the physical environment on shaping women's urban experiences. Drawing on feminist geographic and planning theory, this article develops an analytical framework to think women's spatial options and behaviours. The remainder of the article presents empirical research on two outdoor public spaces in the city of Nablus, Palestine, and analyses the use of these spaces by Nablusi women. It is concluded that three factors – space audience, spatial opportunities and space organisation – affect their perception of space, which in turn shapes and constructs their spatial options and behaviours.  相似文献   
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