The cytotoxicity of various ball-milled UICC amosite samples toward mouse peritoneal macrophages in vitro was examined. On increased ball milling, the cytotoxicity of the amosite samples fell. This decreased biological activity seemed to correlate best with number of fibers longer than 4 micron/micrograms dust, rather than total number of fibers or the electrophoretic mobility of the amosite sa...

This chapter describes the state of technology for studying Internet crimes against children, specifically and . We begin by presenting a survey of relevant research articles that are related to the study of . This survey includes a discussion of our work on the classification of chat logs that contain or . Many commercial enterprises have developed to monitor these behaviors, and the latest ve...

A main challenge for the design and building of green and smart cities is the redevelopment of existing built environments. This research investigates the usefulness of urban district sustainability evaluation systems in informing and guiding urban redevelopment projects. The German DGNB Urban District (DGNB UD) sustainability assessment and certification system has been chosen among others due...

This paper looks at parking policy in dense urban districts (“downtown”), where spatial competition between parking garages is a key feature. The paper has four parts. The first looks at the “parking garage operator’s problem”. The second derives the equilibrium in the parking garage market when there is no on-street parking, compares the equilibrium to the social optimum, and examines parking ...

Noise pollution is a major problem for the quality of life in urban areas. The present study was conducted to determine the noise levels of road traffic at central area of Tehran. It focused on one of the busy and crowded square along with its 7 connecting streets, which had a heavy traffic and located in the downtown of the city. Total of 115 measuring points were selected along the roads, pav...

Abstract Urban geology analyses natural risks and promotes geoheritage in urban areas. In the cities, characterized by a high cultural value, hypogean artificial cavities, often present downtown, offer unique opportunity to show geological substratum. Moreover, these places could be point of interest trekking with abiotic component landscape as topic (geotourism). To investigate areas, rigorous...

This paper quantifies the repeatability of largescale signal variations in an urban propagation environment. We propose a model and use field measurements taken in downtown San Francisco to quantify how similar the received signals appear when a mobile receiver revisits the same general area. The results establish bounds for repeated measurements within a given street that are taken on differen...