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Origin-Destination surveys, which are regularly conducted in many cities (to calibrate transport models), contain indirect
information on individual time use that can be recovered through the declared trip purpose. Although this data source is very
rich, it has two limitations for the calibration of time use models: the level of disaggregation regarding time use is constrained
by the definition of trip purposes, and the information gathered on different time periods is usually obtained from different
individuals. In this paper we propose a new method to overcome the second limitation, transforming the original daily observations
into individual-weeks. For every working day observation we build Saturday and Sunday “twins” as a convex combination of observed
weekend individuals such that the distance between the attributes of the working day individual and the synthetic twin is
minimized. We applied this procedure to the Santiago OD survey, and generated a database of weekly observations particularly
rich for model calibration and segmentation. 相似文献
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拥有合适的工具和维修信息才能有效地进行故障诊断和维修。但是,哪些工具和维修信息适合于你呢? 相似文献
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作为技术人员,我们总要研究各种总成与零件,了解清楚这些总成是怎样分解成各种零件,然后又怎么装配到一起的。在工作中,我们天天看到和接触到的就是拆解、维修和组装的工作。当然,我们工作的最终目标就是把车修好。这个时候,如何读取电路图就成了我们必备的技能之一了。其实,理解电路图与我们把总成拆解成零件是同样的道理。 相似文献
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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