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131.
This paper presents an analysis of the image of seafarers in Spanish newspapers. This is done by a qualitative and quantitative analysis of the news published in six representative newspapers in the days following the shipwrecks of 24 oil tankers between 1976 and 2007. A total of 359 news items have been studied analysing the type of language used, its place in the pages of the newspapers, the comments of the journalists who wrote them, etc., arriving at the conclusion that seafarers have a bad image in the Spanish printed press. 相似文献
132.
Guido Friebel Sergei Guriev Russell Pittman Elizaveta Shevyakhova Anna Tomová 《运输评论》2013,33(3):251-271
Abstract Railways restructuring takes place under very different circumstances and with very different goals in Western Europe, Central and Eastern Europe, and Russia. There are some improvements in productivity associated with the reforms in the European Union (among others access to infrastructure and vertical separation). But they are not certain to be replicated following similar restructuring in transition economies, especially if one takes account of the much higher shadow price on government subsidies in the latter. The current and proposed reforms in the railways of Central and Eastern Europe and Russia are described in detail; the likely outcomes of reforms in the special economic, regulatory and legal environments of these countries are analysed; and an alternative proposal for restructuring in Russia is presented. 相似文献
133.
Conventional data envelopment analysis (DEA) models consider a system as a single-process ‘black box’. There are, however, DEA approaches that consider a system as composed of distinct processes or stages, each one with its own inputs and outputs and with intermediate flows among the stages. In this paper, a network DEA approach to airline efficiency assessment is presented. One conclusion of the study is that the network DEA approach has more discriminative power than the single-process DEA approach and that the computed targets, efficiency scores and rankings are more valid. This is because network DEA allows for a more fine-grained analysis that leads to a more realistic estimation of the overall system production possibility set than the one assumed by conventional DEA. In other words, compared with network DEA the conventional, single-process DEA represents an aggregated analysis that merges all system processes with their inputs and outputs and ignores their internal flows. The main drawbacks are the need for more detailed data (i.e. at the process level) and the greater complexity of the resulting models, especially if there are inputs or outputs that are shared among the processes. 相似文献
134.
Alfonso Cuevas Jiménez Jorge I. Euán Ávila Rodolfo Silva Casarín 《Coastal management》2016,44(4):333-349
Beach erosion can have important socioeconomic and environmental consequences, particularly in tropical regions where tourism is a significant source of income. Although caused by natural processes, erosion is often aggravated by disorderly anthropogenic modification of the coast and extreme events. In Yucatan, Mexico, increasing urban development and deficient coastal management strategies as well as hurricanes have affected beach stability. This has highlighted the need for adequate coastal planning and policies that ensure the protection of key coastal ecosystems, such as beaches and sand dunes. To address this, a methodology to classify the coast according to its vulnerability is presented in this work. This methodology assumes that morphological features are indicators of beach evolution and the processes driving it and that these can be associated with different levels of vulnerability. The features considered are beach width, dune vegetation, anthropogenic pressure, and shoreline orientation, which were analyzed through aerial images and a multicriteria evaluation. It was observed that the most vulnerable areas are found near the most developed parts of the coast, where narrow beaches with little dune vegetation dominate. It is expected that this index will be of use to coastal planners and decision makers, particularly in the identification of critical zones. 相似文献
135.
A time-use investigation of shopping participation in three Canadian cities: is there evidence of social exclusion? 总被引:1,自引:0,他引:1
Steven Farber Antonio Páez Ruben G. Mercado Matthew Roorda Catherine Morency 《Transportation》2011,38(1):17-44
Increasing awareness and concern about the status of mobility-disadvantaged groups in society has given rise to a wide body
of research that focuses on the social exclusion dimension of transportation. To date, much of the empirical work on this
topic is mainly spatial in nature despite recent developments that call for the inclusion of time use analyses in social exclusion
research. In this paper we attempt to fill this gap by estimating activity and trip durations to determine whether poverty,
old age, or being a single parent results in time use patterns indicative of exclusion. Given the importance of shopping and
using services for social inclusion objectives, these activities are the focus of this investigation. In terms of methods,
use of a multiple equation approach allows for the estimation of the daily duration of shopping activities and trips while
simultaneously controlling for daily durations of four broad categories of activities as well as their associated travel times.
The results indicate: that being a senior citizen increases travel durations while decreasing shopping activity durations;
that coming from a low income household decreases shopping activity durations; and single-parent status does not impact shopping
activity durations when holding income and other activity durations constant. These results highlight the feasibility and
challenges of time-use and activity analysis in social exclusion research. 相似文献