50 research outputs found

    Driving for Fun? - A Comparison of Weekdays and Weekend Travel

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    Focusing on individual motorists in car-owning households in Germany, this paper econometrically investigates the determinants of automobile travel with the specific aim of quantifying the effects of fuel prices and person-level attributes on travel conducted over a five-day week and weekend. Our analysis is predicated on the notion that car use is an individual decision, albeit one that is dependent on intra-household allocation processes, thereby building on a growing body of literature that has identified the importance of socioeconomic factors such as employment status, gender, and the presence of children in determining both access to the car and distance driven. To capture this two-stage decision process, we employ the Two-Part Model, which consists of Probit and OLS estimators, and derive elasticity estimates that incorporate both the discrete and continuous choices pertaining to car use.With fuel price elasticity estimates ranging between -0.42 and -0.48, our results suggest raising prices via fuel taxes to be a promising energy conservation and climate protection measure

    SEASTAR: a mission to study ocean submesoscale dynamics and small-scale atmosphere-ocean processes in coastal, shelf and polar seas

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    High-resolution satellite images of ocean color and sea surface temperature reveal an abundance of ocean fronts, vortices and filaments at scales below 10 km but measurements of ocean surface dynamics at these scales are rare. There is increasing recognition of the role played by small scale ocean processes in ocean-atmosphere coupling, upper-ocean mixing and ocean vertical transports, with advanced numerical models and in situ observations highlighting fundamental changes in dynamics when scales reach 1 km. Numerous scientific publications highlight the global impact of small oceanic scales on marine ecosystems, operational forecasts and long-term climate projections through strong ageostrophic circulations, large vertical ocean velocities and mixed layer re-stratification. Small-scale processes particularly dominate in coastal, shelf and polar seas where they mediate important exchanges between land, ocean, atmosphere and the cryosphere, e.g., freshwater, pollutants. As numerical models continue to evolve toward finer spatial resolution and increasingly complex coupled atmosphere-wave-ice-ocean systems, modern observing capability lags behind, unable to deliver the high-resolution synoptic measurements of total currents, wind vectors and waves needed to advance understanding, develop better parameterizations and improve model validations, forecasts and projections. SEASTAR is a satellite mission concept that proposes to directly address this critical observational gap with synoptic two-dimensional imaging of total ocean surface current vectors and wind vectors at 1 km resolution and coincident directional wave spectra. Based on major recent advances in squinted along-track Synthetic Aperture Radar interferometry, SEASTAR is an innovative, mature concept with unique demonstrated capabilities, seeking to proceed toward spaceborne implementation within Europe and beyond

    Save your blushes and stop routine thrombus aspiration during primary pci

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    This editorial refers to \u27Myocardial blush and microvascular reperfusion following manual thrombectomy during percutaneous coronary interventions for ST elevation myocardial infarction: insights from the TOTAL trial\u27(dagger), by V. Sharma et al., on page 1891

    Save your blushes and stop routine thrombus aspiration during primary pci

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    This editorial refers to 'Myocardial blush and microvascular reperfusion following manual thrombectomy during percutaneous coronary interventions for ST elevation myocardial infarction: insights from the TOTAL trial'(dagger), by V. Sharma et al., on page 1891

    Piezoelectric coefficient of aluminum nitride and gallium nitride

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    Author name used in this publication: C. M. LuengAuthor name used in this publication: C. Surya2000-2001 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe
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