排序方式: 共有222条查询结果,搜索用时 15 毫秒
1.
Trigger levels for fine suspended sediment (FSS) load in streams are required to identify rainfall-runoff events that have significantly elevated FSS loads, compared with expected background loads, as a result of catchment disturbance. Stream FSS load data collected in the mine-impacted Magela Creek catchment in the wet-dry tropics were used to derive water quality management trigger levels for two approaches – a Before-After-Control-Impact Paired difference design (BACIP) and a regression relationship between observed FSS load and corresponding event discharge characteristics. The results indicate that both the BACIP and regression relationship approaches behave similarly, with similar FSS load events elevated above trigger levels. Notwithstanding this, it is recommended that in order to reliably assess the location and magnitude of a catchment disturbance on FSS load, a combination of BACIP and regression relationship approaches must be adopted. In this study, an event with a FSS load above trigger levels associated with both BACIP and the regression relationship fitted for the downstream site is considered to be significantly elevated as a result of a disturbance within the mine-impacted region. While this technique cannot conclusively determine whether the cause of the disturbance is mine-related or natural (such as fire or bank erosion), it is an efficient statistical method of identifying events that warrant further investigation and management action, if required. 相似文献
2.
《Journal of Medieval History》2012,38(4):477-497
The inns and innkeepers of medieval England form a poorly documented and neglected group of institutions and individuals. Yet at a time of growing specialism, they were a crucial part of the economic infrastructure of the country. This study is focused on the documentation for central southern England but seeks to place this in a wider perspective. There was now a regular provision of inns in accordance with the size and importance of the towns. Inns generated substantial rent and were evidently felt to be worth considerable investment. Innkeepers were among the rich and influential members of the town. Inns played a vital role in the evolving and prospering economic, social and political life of the nation in this period. 相似文献
3.
Damiaan Persyn Javier Barbero Jorge Díaz-Lanchas Patrizio Lecca Giovanni Mandras Simone Salotti 《Journal of regional science》2023,63(4):755-792
We analyze the general equilibrium effects of an asymmetric decrease in transport costs, combining a large-scale spatial dynamic general equilibrium model for 267 European NUTS-2 regions with a detailed transport model at the level of individual road segments. As a case study, we consider the impact of the road infrastructure investments in Central and Eastern Europe of the European Cohesion Policy. Our analysis suggests that the decrease in transportation costs benefits the targeted regions via substantial increases in gross domestic product (GDP) and welfare compared to the baseline, and a small increase in population. The geographic information embedded in the transport model leads to relatively large predicted benefits in peripheral countries such as Greece and Finland, which hardly receive funds, but whose trade links cross Central and Eastern Europe, generating profit from the investments there. The richer, Western European nontargeted regions also enjoy a higher GDP after the investment in the East, but these effects are smaller. Thus, the policy reduces interregional disparities. There are rippled patterns in the predicted policy spillovers. In nontargeted countries, regions trading more intensely with regions where the investment is taking place on average benefit more compared to other regions within the same country, but also compared to neighboring regions across an international border. We uncover that regions importing goods from Central and Eastern Europe enjoy the largest spillovers. These regions become more competitive and expand exports, to the detriment of other regions in the same country. 相似文献
4.
Aurora Higueras‐Milena Castellano Antonio M. Sáez Romero 《International Journal of Nautical Archaeology》2018,47(1):81-102
The area of La Caleta, north‐west of Cadiz, is a key location for studies of the relationship between the Phoenician city of Gadir and the ocean. The port channel and the small islets that characterize the area was one the busiest sectors of the city, and there are abundant underwater remains attesting to past commercial activities. The area also had an important religious role: two sanctuaries were located at the western end of the rocky promontories that surround the channel, and many items identified as offerings have been found. This article synthesizes previous research and provides an overview of the results of a recent project (2008–2010), which enables a thorough review of the development of the seascape and its use during the 1st millennium BC. 相似文献
5.
Sandra Logan 《The Seventeenth century》2018,33(4):411-426
ABSTRACTAttending to Poly-Olbion’s river dynamics, I argue that, implicitly opposing natural, inevitable unionization, Drayton demonstrates through visual and poetic means that any viable empire is forged by deliberate local choices about conjunction and affiliation. Further, I show that by reconfiguring Saxton’s maps, rejecting politically defined boundaries and perceptions, and situating three major rivers as the organizing features of the landscape and the empire, Drayton ultimately defines Britain as inherently and universally maritime. Moreover, linking Poly-Olbion to mare clausum and mare liberum debates, I reveal that Drayton situates the flow of self-aware rivers into the sea as an extension of Britain beyond its land boundaries. He thereby suggests that the eventual mixing of British waters with the larger oceans establishes the basis of Britain’s local and global maritime rights, linking regional autonomy and conjunction by choice with claims to both local offshore dominion and global freedom of navigation and trade. 相似文献
6.
Maritime territorialisation as performance of sovereignty and nationhood in the South China Sea 总被引:2,自引:0,他引:2
下载免费PDF全文
![点击此处可从《Nations & Nationalism》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Edyta Roszko 《Nations & Nationalism》2015,21(2):230-249
The South China Sea (SCS) is a conflict‐ridden international arena of rivalry between China, the USA, India, and the other ASEAN countries over sovereignty, resources and security. In this geopolitical clash China is the dominant force and Vietnam its main challenger. While most analysts assume that the various claims to the mostly uninhabited islands are motivated by the presence of submarine mineral resources, the conflicts evoke strong nationalist feelings in Vietnam and China, fuelled by narratives of the historical presence of fisheries and navies. By analysing the tension between complex territorial claims, new technologies and forms of knowledge applied by these states to delineate their material borders on the sea and vernacular notions of social space, this paper explores how sovereignty and nationality is enacted on a day‐to‐day basis. Thus, I argue that maritime territorialisation is a paradox of treating the sea as ‘land’ produced by the performance of a socially constructed image of the state geo‐body capitalising on strong nationalistic sentiments in China and Vietnam. 相似文献
7.
Maritime Aspects of Medieval Siraf,Iran: a pilot project for the investigation of coastal and underwater archaeological remains
下载免费PDF全文
![点击此处可从《International Journal of Nautical Archaeology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Sorna Khakzad Athena Trakadas Matthew Harpster Nicole Wittig 《International Journal of Nautical Archaeology》2015,44(2):258-276
Siraf is well‐known archaeologically and historically as an ancient port in the Persian Gulf that prospered during the medieval period. Siraf played a leading role in facilitating maritime and terrestrial trade, connecting long‐distance Indian Ocean and China routes with those in the Gulf region. Despite its history, no previous research has been dedicated to the maritime infrastructure of Siraf. Through the ‘2012 Siraf pilot project’ a preliminary survey of the underwater and shoreline remains of this ancient port city was conducted. The site's location is unique in many respects to trade routes and logistical considerations; however, its maritime infrastructure is difficult to assess in light of the extensive threats to the site. 相似文献
8.
In 2000, a well‐preserved, c.21 m‐long shipwreck, Doel 1, was found upside‐down in a silted‐up creek near the river Scheldt (Belgium). An interdisciplinary research project was initiated, including 3D registration of all timbers, wood species identification, dendrochronology and archaeobotanical analysis of the caulking material. Doel 1, of which 70% is preserved, displays the construction features of a cog. Unseasoned wood was used and dated by dendrochronology to AD 1325/26. Remarkable features include the symmetrical layout of the bottom planks, the atypical arrangement of the frames to the fore, and evidence of partial dissassembly of the ship after intensive use. 相似文献
9.
Abbas Ziafati Bafarasat 《European Planning Studies》2016,24(11):2057-2075
This paper discusses three normative standpoints on conflict in strategic spatial planning: no conflict, conflict for consensus and conflict for meta-consensus on the validity of dispute. These views apply to the questions of whether and why projects, as a major source of conflict, should be identified in the process of strategic planning. In their approaches to these questions, the performance school advocates the production of general guidelines to avoid conflict, the collaborative perspective supports the identification of projects in strategic planning in order to utilize their potential in a conflict-to-consensus journey and the conflict-oriented perspective favours the identification of projects in strategic planning in order to arrive at meta-consensus on the immediate disputability of robust agreements. Reflecting on the collaborative perspective, this paper tests a hypothetical model of how conflicts created in the face of project identification can feed in making consensual strategies. Findings in the North West region of England support the model and suggest some difficulties with reviewing such consensus around which a resistance network forms. The paper puts forward some recommendations for overcoming the review challenge. 相似文献
10.
Carme Miralles-Guasch Montserrat Martínez Melo Oriol Marquet 《Gender, place and culture : a journal of feminist geography》2016,23(3):398-417
Gender differences in mobility patterns between women and men have long been acknowledged. This study analyses how these differences are reproduced in different urban and rural contexts. Using mobility data from a large travel survey taken in 2006 in Spain, we examine the differences between gender mobility through age, modal split and trip purposes. Special attention is paid to how territory shapes mobility and how these territorial settings differently affect gendered mobilities. The use of this data source allows the comparison of all trips made by the total population, including all means of transport. By taking a global view on mobility, the uneven relationships that men and women have with different means of transport become more visible. After disaggregating data by age and territorial settings, results show that women are using sustainable transport modes more often than men, and travelling for more diverse reasons. Gender is thus a fundamental variable in understanding modal split and, by extension, transport sustainability, in terms of energy consumption and the emission of greenhouse gases. From this point of view, we consider women's mobility knowledge and practices – typically related to the most sustainable means of transport – as factors with rising value that could effectively guide public policy in its way to promote more sustainable mobility patterns. 相似文献