We cross-correlate the galaxies brighter than mB = 18 in the Virgo cluster with the radio sources in the NVSS survey (1.4 GHz), resulting in 180 radio-optical identifications. We determine the radio luminosity function of the Virgo galaxies, separately for the earlyand late-types. Late-type galaxies develop radio sources with a probability proportional to their optical luminosity. In fact their...

The purpose of this paper is to analyze the patterns and determinants of the extent and duration of breastfeeding in Jordan. Data is from a national sample of women surveyed by the Government of Jordan in 1976 as part of the World Fertility Survey program. Women's level of education appears to have the expected negative impact on the decision to ever breastfeed the child or not. Having other...

BACKGROUND Studies involving the built environment have typically relied on US Census data to measure residential density. However, census geographic units are often unsuited to health-related research, especially in rural areas where development is clustered and discontinuous. OBJECTIVE We evaluated the accuracy of both standard census methods and alternative GIS-based methods to measure rur...

t Milton Friedman's sixtieth birthday conference, in 1972, George Stigler, the dinner speaker and Milton's friend and colleague, discussed econo-mists' or academics' influence, particularly Milton Friedman's influence. As I recall the lecture after more than thirty years, Stigler began by noting that Mil-ton Friedman was among the most influential of all economists. Then he asked how influentia...

In this article, we provide the nontechnical reader with a fundamental understanding of the components of virtual reality (VR) and a thorough discussion of the role VR has played in social science. First, we provide a brief overview of the hardware and equipment used to create VR and review common elements found within the virtual environment that may be of interest to social scientists, such a...

BACKGROUND Caesarean deliveries are on the increase in Greece and around the world. The objective of the present study was to assess the frequency of planned and emergency caesarean deliveries and their socio-demographic predictors in women with singleton pregnancies followed-up from early pregnancy to delivery. METHODS The mother-child cohort in Crete examines a population sample of pregnant...

When I arrived in Lancaster County, in May of 1989, every acre of land seemed to be for sale. The county's farmland preservation program that I was to head had saved only 5,600 acres, less than one percent of the entire county. Comments Reprinted from Planning, January 2000, pages 14-17. This journal article is available at ScholarlyCommons: http://repository.upenn.edu/cplan_papers/27 Copyright...

This article contributes to the nascent literature on the health of urban Aboriginal people by comparing the health status and determinants of health of the urban Aboriginal and urban non-Aboriginal population in Canada. Data for the research were taken from the 2001 Aboriginal Peoples Survey (APS) and the 2000–2001 Canadian Community Health Survey (CCHS) Cycle 1.1. Framed within a population h...

There would seem to be many students who really want to learn, who have a huge appetite to learn, but who constantly struggle with their work. They just have not been prepared to be independent learners who can think and solve problems. A recent but promising area of applying IHS (Intelligent Hybrid Systems) is focused on intelligent tutoring systems. These intelligent tutoring systems, based o...

This technical paper lays out the methodology used to develop a hedonic price model to measure price trends around The 606, a newly established linear park system on the northwest side of Chicago. Two pricing models were required to understand how the housing market responded to the development of the trail. First, in order to analyze the project’s impact by time and geographical area, the Inst...