MORE THAN EVER, history courses are crossing boundaries. For example, the college-level African Diaspora course I have been teaching is a case in point: it surveys interactions linking the African continent and its Atlantic diaspora over the past 500 years. Other examples of old and new boundary-crossing courses include surveys of world history, Western Civilization, and such thematic courses a...

In this paper, we discuss a direct measure for aperiodic energy and periodic energy in speech signals. Most measures for aperiodicity have been indirect, such as zero crossing rate, highfrequency energy and the ratio of high-frequency energy to lowfrequency energy. Such indirect measurements will usually fail in situations where there is both strong periodic and aperiodic energy in the speech s...

The expected value for the weighted crossing number of a randomly weighted graph is studied. A variation of the Crossing Lemma for expectations is proved. We focus on the case where the edge-weights are independent random variables that are uniformly distributed on [0, 1].

Abstract Waves in the sea have a random shape, where height, length, and direction of waves change during observation time. Due to unpredictable nature with certain patterns, statistical probability approach is needed analyzing waves. Before carrying out analysis, it necessary extract wave parameters from data. There are two methods commonly used parameters: first individual analysis method, us...

The identification of migration routes, wintering grounds and stopover sites are crucial issues for the understanding of the Palearctic-African bird migration system as well as for the development of relevant conservation strategies for trans-Saharan migrants. Using miniaturized light-level geolocators we report a comprehensive and detailed year round track of a granivorous trans-Saharan migran...

STUDY OBJECTIVE The aim of this study is to identify risk factors for asthma prevalence and chronic respiratory illnesses in Buffalo's neighbourhoods after previous studies reported increased levels of asthma among residents on Buffalo's west side. DESIGN Cross sectional surveys. SETTING Buffalo neighbourhoods along a US-Canada border crossing point. SUBJECTS A systematic random survey of...

October 2008 Preliminary version Please do not quote! Abstract. This paper examines the patterns of educational assortative mating in East and West Germany. In the literature it is well known that individuals do not mate randomly according to social and cultural traits. Marrying within a socio-economic group can lead to polarization and exacerbating economic inequality. In the US, there is a co...

This study investigated differences in simulated driver risk-taking behavior among U.S., Spanish, and West German subjects. The task consisted of performing a simulated intersection crossing on a video display. Subjects were shown an intersection with moving traffic on a horizontal road, and they were asked to attempt (under time pressure) a fixed number of crossings with a car moving verticall...