Sustainable transportation and mobility are key components and central to sustainable development. This research aims to reveal the macro-level social, economic, and environmental impacts of alternative vehicle technologies in the U.S. The studied vehicle technologies are conventional gasoline, hybrid, plug-in hybrid with four different all-electric ranges, and full battery electric vehicles (B...

In a recent paper in the journal, Calbet (2001) describes the analysis of data on primary production and mesozoo-plankton grazing from a wide variety of marine ecosystems. The somewhat surprising result of Calbet's analysis is that, ''The slope of the log-log relationship between ingestion rates and PP was significantly Ͻ1, indicating a decline of relative importance of mesozooplankton grazing ...

The main objective of this cross-sectional study was to determine the validity of the silhouette rating scale and reported values of height and weight in assessing weight status in a group of adolescents. 245 adolescents, students of the Belgrade elementary school, aged 11-14 (12.33 +/- 0.50), were involved. Weight status was assessed by anthropometry, self-reported height and weight and by fig...

This paper covers the use of technology to support three aspects of Alternative Assessment: Observations of Student Learning, Performance Assessments, and Electronic Portfolios. Discussion includes the differences between Performance Assessments and Portfolios, definition of electronic portfolios, the benefits of electronic portfolios, along with the author's five-stage and fivelevel electronic...

Based on imperfect data and theory, agencies such as the United States Environmental Protection Agency (USEPA) currently derive "reference doses" (RfDs) to guide risk managers charged with ensuring that human exposures to chemicals are below population thresholds. The RfD for a chemical is typically reported as a single number, even though it is widely acknowledged that there are significant un...

This paper investigates the world economic implications of climate change policy strategies, especially the evaluation of impacts by an implementation of Clean Development Mechanisms, Joint Implementation and Emissions trading with a world integrated assessment model. Of special interest in this context are the welfare spill over and competitiveness effects that result from diverse climate poli...

Trails are a primary recreation resource facility on which recreation activities are performed. They provide safe access to non-roaded areas, support recreational opportunities such as hiking, biking, and wildlife observation, and protect natural resources by concentrating visitor traffic on resistant treads. However, increasing recreational use, coupled with poorly designed and/or maintained t...