共查询到20条相似文献,搜索用时 31 毫秒
1.
Continuity and change in commuter partnerships: avoiding or postponing family migration 总被引:1,自引:0,他引:1
Marjolijn van der Klis 《GeoJournal》2008,71(4):233-247
While most people in post-industrial societies, such as The Netherlands, continue to live as nuclear families, new household
arrangements have emerged in which couples no longer commit to living in one shared residence. One such household arrangement
is the commuter partnership, in which one partner lives near work part of the time. The objective in this article was to gain
a better understanding of the sustainability of commuter partnerships and to contribute to uncovering the function that this
household arrangement can have in the coordination of parallel careers of different household members over time. The study
draws on in-depth interviews with both individual partners in 30 commuter partnerships with at least one residence located
in The Netherlands, and a follow-up survey of the same commuter couples several years later. Our findings indicate that, for
most couples, the commuter partnership should not be regarded as a prelude to family migration, but rather as a household
arrangement by which family migration is avoided altogether, either for a limited period, or as a long-term alternative to
the nuclear family. The findings further indicate that, when couples look on their commuter partnership as the result of their
individual choice, they generally envision the future duration of their commuter partnership quite accurately. When their
choice is guided by the external circumstances of job contracts, couples appear to be less accurate in predicting the future
duration of their commuter partnerships.
相似文献
Marjolijn van der KlisEmail: |
2.
Spatial and temporal knowledge representation 总被引:1,自引:1,他引:0
Antony Galton 《Earth Science Informatics》2009,2(3):169-187
Knowledge Representation (KR) originated as a discipline within Artificial Intelligence, and is concerned with the representation
of knowledge in symbolic form so that it can be stored and manipulated on a computer. This article surveys that part of KR
that is concerned with the representation of space and time, with particular reference to the use of such representations
in geographical information science.
相似文献
Antony GaltonEmail: |
3.
Dorian Speakman 《Natural Hazards》2008,44(1):111-127
A vulnerability index for the Fire Service in the UK has been designed to identify vulnerable locations during episodes of
severe floods. Taking recent case studies with the UK Fire Service, the patterns of vulnerability, in terms of demand on time
and resources, can be explained by investigating the environmental causes and their interaction with the adaptive capacity
of the response agencies.
相似文献
Dorian SpeakmanEmail: |
4.
Melt inclusion formation mechanisms and compositional effects in high-An feldspar and high-Fo olivine in anhydrous mafic silicate liquids 总被引:1,自引:1,他引:0
Important aspects of melt inclusion formation and potential compositions effects have been addressed through a series of experiments using anorthite/fosterite saturated anhydrous mafic liquids. Experimental charges were cooled from 1,300 to 1,230 and 1,210°C at rates of 1–10°/min followed by 0–24 h isothermal periods. Hopper and skeletal crystal morphologies with variable degrees of completeness developed during the cooling period. Planar overgrowth of these textures during isothermal periods led to the formation of inclusions, the majority of which formed after 6 h of isothermal run time. We suggest that the change in morphologies is related to a decrease in growth rates and changes in dominant growth mechanisms. In general, inclusion compositions were uniform and similar to the host glass, indicating that with the isothermal times required for most inclusions to form, a boundary layer was not entrapped that could be detected within the limits of our analyses.
相似文献
Edward KohutEmail: Phone: +1-541-7373023Fax: +1-541-7371200 |
Roger L. NielsenEmail: Phone: +1-541-7371235 |
5.
This study seeks to gauge how far China’s container-related dynamics between 1990 and 2005 fit into the wider perspective
about transport and development within developing countries. In particular, attention is focussed on the role of specific
modes to determine the extent of the penetration of containers within China. Before addressing these key issues extant models
relating to an understanding of port and transport evolution in less-developed countries are recalled, synthesized and used
as a base upon which an appropriate review of China’s case can be conducted. Applying them to China’s northern, central and
southern port ranges not only helps assess the efficacy of these models but also highlights the contribution of individual
modes.
相似文献
Claude ComtoisEmail: |
6.
Indigenous people often exclusively depend on the natural resources available within the ecosystems where they live, and commonly
manage their resources sustainably. They have developed, and continue to develop indigenous knowledge systems which encompass
sustainable management of natural resources. This study compares indigenous knowledge of natural resource management developed
by two different communities in two different environments—Maori in the temperate environment in New Zealand and Dusun in
the tropical environment in Brunei Darussalam, and comparatively evaluates the role of indigenous knowledge in sustainable
resource management in three categories of knowledge such as spatial and seasonal distribution of natural resources, sustainable
harvesting, and habitat management. The comparison reveals that despite the differences in environment and the great geographical
distance between the two communities, there are remarkable similarities between the two knowledge systems in concepts, principles,
strategies and technologies used in natural resource management.
相似文献
Rohana UlluwishewaEmail: |
7.
Space Physics Interactive Data Resource—SPIDR 总被引:1,自引:0,他引:1
Mikhail Zhizhin Eric Kihn Rob Redmon Dmitry Medvedev Dmitry Mishin 《Earth Science Informatics》2008,1(2):79-91
SPIDR (Space Physics Interactive Data Resource) is a standard data source for solar-terrestrial physics, functioning within
the framework of the ICSU World Data Centers. It is a distributed database and application server network, built to select,
visualize and model historical space weather data distributed across the Internet. SPIDR can work as a fully-functional web-application
(portal) or as a grid of web-services, providing functions for other applications to access its data holdings.
相似文献
Mikhail ZhizhinEmail: |
8.
Some observations on the prediction of the dynamic parameters of debris flows in pyroclastic deposits in the Campania region of Italy 总被引:1,自引:0,他引:1
Over the last 20 years, many tools have been developed for the prediction of the post-failure behaviour of rapid landslides.
However, as pointed out by several researchers, knowledge may be improved by the performance of back-analyses using different
models and the evaluation of their reliability. This paper reports the back-analysis, conducted using numerical models, of
57 rapid landslides that have occurred in the Campania region. The back-analysis has been performed using the 2-D DAN_W code
(version 2003) with two different rheological models: the Voellmy and the frictional models. The latter has been immediately
discarded because it did not match the observed data. Instead, using the Voellmy model, the best-fit values of the parameters
(friction μ and turbulence ξ) for different types of flow (channelled, un-channelled and mixed flows) have been researched.
With these values a parametric study has been carried out on four representative slope profiles of the Campania region, enabling
the prediction of runout, velocity and depth of flow (dynamic parameters) of potential debris flows.
相似文献
Anna Scotto di SantoloEmail: |
9.
This paper describes an application of the geographic information system (GIS) technology to a ground stability assessment
in the karst area of Dzerzhinsk, Russia. In the stability analysis, the groundwater level changes in the karst aquifer could
cause suffosion sinkholes when the gravitational force was greater than the soil strength. The GIS technology was used to
combine various data and to delineate the zones of potential gravitational collapse and suffosion collapse in the area.
相似文献
V. V. TolmachevEmail: |
10.
The aim of this paper is to use an economic framework to derive decision making rules for river basin management with a focus on groundwater resources. Using an example from northern Nigeria, the paper provides an example of how decision making for sustainable water resources management may be facilitated by comparing net benefits and costs across a river basin. It is argued that economic tools can be used to assess the value of water resources in different uses, identify and analyze management scenarios, and provide decision rules for the sustainable use and management of surface and ground water resources in the region.
相似文献
Gayatri AcharyaEmail: |
11.
The advent of the Virtual Observatory has begun an evolution in the space physics data environment. A number of nascent and
discipline specific Virtual Observatories have started to emerge with an emphasis on data search and retrieval. As this new
data environment takes shape an emphasis will be placed on interdisciplinary communication in attempts to address large scale
and global problems. To this end we formulate the development of a query language to facilitate Virtual Observatory to Virtual
Observatory communication. Furthermore, we outline the goals of such a language, how it would work and how existing community
efforts can be leveraged to speed the development of this query language.
相似文献
T.W. NarockEmail: |
12.
Predicting environmental conditions to minimise salt damage at the Tower of London: a comparison of two approaches 总被引:1,自引:0,他引:1
Clifford A. Price 《Environmental Geology》2007,52(2):369-374
The paper compares the results of two studies of salt damage at the Wakefield Tower, Tower of London. The first, in 1993,
was based on semi-quantitative salt analysis and hygroscopicity measurements. The second was based on quantitative analysis
and a thermodynamic model, ECOS. Both studies aimed to predict environmental conditions that would minimise salt damage to
the interior stonework. Their predictions are markedly different, and this paper examines the reasons for the differences.
It is shown that hygroscopicity alone is not a reliable indicator of crystallisation from mixed salt solutions.
相似文献
Clifford A. PriceEmail: |
13.
Airline data for global city network research: reviewing and refining existing approaches 总被引:5,自引:0,他引:5
Information on air passenger flows is potentially a prime data source for assessing spatial patterns in the global city network,
but previous analyses have been hampered by inadequate and/or partial data. The ensuing analytical deficiencies have reduced
the overall value of these analyses, and this paper examines how some of these deficiencies may be rectified. First, we review
the rationale for using airline data to analyse the global city network. Second, we assess the data problems encountered in
previous research. Third, we elaborate on the construction of datasets that may circumvent some of these problems. The proposed
refinements include the omission of the hub function of major airports and ways to extract relevant business flows from the
data.
相似文献
Jon BeaverstockEmail: |
14.
David Havlick 《GeoJournal》2007,69(3):151-164
Since 1988, more than 20 US military bases have been redesignated as national wildlife refuges. In order to understand the
processes of these military-to-wildlife (M2W) conversions and their implications, I examine three logics that help to produce
these particular changes: Biodiversity, Brownfields, and Serendipity. These logics contribute to a broader discourse of ecological
militarization that frames military practices as compatible with and contributing to environmental protection. I focus on
the case of the Rocky Mountain Arsenal, Colorado, USA, to examine how these logics of conversion are mobilized into practice,
and what such changes mean as they bring militarism and environmental conservation together in reconfigured spaces.
相似文献
David HavlickEmail: |
15.
Remote sensing and GIS based determination of groundwater dependent ecosystems in the Western Cape, South Africa 总被引:4,自引:0,他引:4
Finding the location of groundwater dependent ecosystems (GDEs) is important in determining the extent of restrictions that
need to be placed upon the abstraction of groundwater. Remote sensing was combined with geographical information system (GIS)
modelling to produce a GDE probability rating map for the Sandveld region, South Africa. Landsat TM imagery identified the
areas indicating the probable presence of GDEs and GIS assisted in their delineation. Three GIS models were generated: a GIS
model predicting landscape wetness potential (LWP model) based on terrain morphological features; the LWP model was modified
to highlight groundwater generated landscape wetness potential (the resulting GglWP model); and a groundwater elevation model
was interpolated, combining groundwater level measurements in boreholes in the region with digital elevation model data. Biomass
indicators generated from Landsat were classified and combined with the GIS models, followed by field verification of riverine
and wetland GDEs. The LWP model provided the most accurate results of the three models tested for GDEs in this region.
相似文献
Zahn MünchEmail: |
16.
Summary The question of alternative technologies for high-speed Internet access lies at the heart of rural development problems. In
this paper, we focus on one of those technologies, the system combining satellite technologies and Wi-Fi. Based on an empirical
study carried out in three rural areas, we analyze the dynamics of the use and appropriation of that technology by the companies
and organizations participating in the experiment. Considered both from a technical and social standpoint, the technology
‘in use’ appears here in its structuring dimensions.
相似文献
Valérie FautreroEmail: |
17.
Transportation infrastructure has always played an important role in the economic fate of regions. In particular, airline
networks have dramatically decreased the geographic and temporal constraints of moving people, goods and information; all
of which are increasingly crucial inputs for the information economy. As a result, regions have become more concerned with
both the quantity and quality of airline connections. The purpose of this paper is to examine the emerging global hierarchy
of airline network connectivity. Using a proprietary database of nearly 900 airline carrier schedules from 2006, we examine
regional connectivity between 4,650 worldwide origins and destinations. Through the use of network analysis and graph theoretical
techniques, results indicate an increasingly complex web of nodal hierarchies in North America, Europe and Asia.
相似文献
Tony H. GrubesicEmail: |
18.
Igor Vojnovic 《GeoJournal》2007,69(4):271-300
Throughout the 20th century, government in the U.S. has gone through significant changes; initially responding to the disorder
of early capitalism, and later, to the economic crisis of the 1970s. This article will explore the changes in the U.S. political
landscape over the last century, as well as the recent rise of neo-liberalism. In addition, with the analysis of the model
laissez-faire municipal government, the City of Houston, the article will illustrate how the basic weaknesses of neoliberalism
at the national level are also evident at the local scale of government.
相似文献
Igor VojnovicEmail: |
19.
This article explores the impacts of floods on the economy, environment, and society and tries to clarify the rural community’s
coping mechanism to flood disasters in Central Viet Nam. It focuses on the social aspects of flood risk perception that shapes
the responses to floods. The research findings revealed that flooding is an essential element for a coastal population, whose
livelihood depend on productive functions of cyclical floods. The findings also revealed that floods, causing losses and damages,
often inhibited economic development. The surveyed communities appeared to have evolved coping mechanisms to reduce the negative
impacts of the floods, yet these coping mechanisms are under pressure due to environmental degradation. Integrated flood risk
management is considered as a suitable paradigm for coping with flood disasters.
相似文献
Phong TranEmail: |
20.
Tornado shelters and the manufactured home parks market 总被引:2,自引:2,他引:0
Manufactured or mobile homes represent a fast growing portion of the housing market but are particularly vulnerable to tornadoes.
In the US over 40% of tornado fatalities occur in mobile homes even though they comprise about 8% of US housing units. We
examine the market for tornado shelters in manufactured home parks in Oklahoma. Almost 60% of parks in the state have shelters,
with 90% of the shelters underground. Parks with shelters are not concentrated in urban areas but spread across the state,
with parks with shelters in 32 counties. We find that rents for lots in parks with shelters are 5–8% higher, which generates
sufficient revenue to approximately pay for shelters, but the point estimate is statistically significant in only one specification.
相似文献
Daniel Sutter (Corresponding author)Email: |