We present a system for collaborative conceptual design that allows users potentially located in geographically distant areas to cooperate by sketching, exploring and modifying their ideas interactively, with immediate visual feedback. The system supports several modeling primitives and can be easily extended with user-defined objects. In this context, we introduce the notions of animated and s...

I nmymathematical youth, when I first learned of Gödel’s Theorem and computational undecidability, I was at once fascinated and strangely reassured of our limited place in the grand universe: incredibly, mathematics itself establishes limits on mathematical knowledge. At the same time, as one digs into the formalisms, this area can seem remote from most areas of mathematics and irrelevant to th...

The setting of guidelines is a key normative function of the World Health Organization. This chapter examines the development of the current water-related WHO guidelines. Within the area of water, microbiology and guideline setting there are three distinct but related areas, namely: x drinking water; x wastewater reuse; and x recreational water. The following explores the background to the curr...

water supply of green spaces in arid areas is a major challenge. a high percentage of green spacescreate lawns, which are high water consumer landscapes. due to the environmental, recreational andathletic values of lawns, they are considered as non-removable elements in urban green space development.this paper reviews and discusses strategies for efficient water usage in lawn areas using librar...

BACKGROUND The rising prevalence of diabetes and obesity in India can be attributed, at least in part, to increasing levels of physical inactivity. However, there has been no nationwide survey in India on physical activity levels involving both the urban and rural areas in whole states of India. The aim of the present study was to assess physical activity patterns across India - as part of the ...

Lead, one of the earliest metals recognized and used by humans, has a long history of beneficial use to humankind, but has now been recognized as toxic and as posing a widespread threat to humans and wildlife. The adequacy and widespread nature of lead ores (primarily in the forms of the carbonate cerussite, PbCO3, and the sulfide, galena, PbS, combined with its ease of extraction have resulted...

this study was performed in order to provide a strategic development plan for ecotourism in shahdad district of kerman province. thus cultural, historical and natural attractions of the region and its surrounding areas were studied and identified initially. by completing clawson questionnaire in the form of travel cost method (tcm), valuation and analysis of ecotourism demand index of the consi...

recreational waters should be considered as risks for enterococcal infections in regions with high utilization and long exposure periods. the aim of this study was to investigate the resistance of enterococci to selected antibiotics and some heavy metals [pb+2, fe+2, zn+2 and cr+2]. a total of 75 enterococcal isolates was obtained from 54 bathing and fishing water samples from 9 bathing and fis...

BACKGROUND Preliminary evidence suggests that recreational walking has different environmental determinants than utilitarian walking. However, previous studies are limited in their assessment of environmental exposures and recreational walking and in the applied modeling strategies. Accounting for individual sociodemographic profiles and weather over the walking assessment period, the study exa...

BACKGROUND The transition from active employment to retirement is a potentially critical period for promoting maintenance or development of recreational physical activity in older age. Park proximity and quality might be important correlates of recreational physical activity in this age group. However, research on park-physical activity relationships among mid-older aged adults is limited and i...