With an increasing demand for forest-based products, there is a growing interest in introducing fast-growing non-native tree species in forest management. Such introductions often have unknown consequences for native forest biodiversity. In this study, we examine epiphytic lichen species richness and species composition on the trunks of non-native Pinus contorta and compare these to the native ...

Streamside management zones (SMZs) in the Ouachita Mountains of Arkansas and Oklahoma are frequently established along headwater ephemeral and intermittent streams to protect water quality, provide wildlife habitat, and increase landscape diversity. To better understand the function of these riparian forest corridors, we characterized the tree density and composition, forest floor mass, and dow...

Microsoft stands accused of an illegal defense of its dominant position in the desktop operatingsystem market. According to the charge, exclusionary contracts and predatory conduct dealing primarily with the Internet browser prevented the browser from evolving into a rival for Microsoft’s operating system, Windows. Earlier, the government negotiated a consent decree with Microsoft limiting excl...

On 17 November 2002, Prof. Marco Somalvico passed away suddenly and prematurely. We are past the fifth anniversary, but Marco has never ceased to be a major influence, indeed a cherished human presence as well in one’s memories, for his disciples, collaborators, and colleagues who knew him. Some of these have undertaken the initiative of several commemorative issues, hosted in a number of journ...

co2 is the main greenhouse gas which urban forests have a high potential to absorb and sequestrate it. the air pollution of tehran is one of the most important environmental problems of the iran. to do this research 40 years old stands of robinia pseudoacacia and fraxinus rotundifolia and the surrounding barren land ( as blank) were selected in chitgar forest park of tehran and the amount of ca...

9 10 Abstract 11 12 Declining red pine, Pinus resinosa (Aitman), stands in the Great Lakes region appear to arise from a complex of biotic and 13 abiotic factors. We monitored stem and root colonizing beetles in declining and healthy plantations in Wisconsin from 1997 to 14 1999. We also conducted systematic field excavations and laboratory isolations of various root pathogens. Multiple funnel ...

Avicennia and Rhizophora are globally occurring mangrove genera with different traits that place them in different parts of the intertidal zone. It is generally accepted that the oxidizing capacity of Avicennia roots is larger than that of Rhizophora roots, which initiates more reduced conditions in the soil below the latter genus. We hypothesize that the more reduced conditions beneath Rhizoph...

Every day planners and dispatcher in airports deal with different decisions related to the movement of aircraft. These decisions usually involve the use of fixed resources like runways, stands (parking positions), and passenger gates. Due to the increasing flow of passengers, these resources are becoming scarce and some airports have experimented a degradation of the services offered. One clear...

Recent research in mobile robot navigation make it feasible to utilize autonomous robots in service fields. But, such applications require more than just navigation. To operate in a peopled environment, robots should recognize and act according to human social behavior. In this paper, we present the design and implementation of one such social behavior: a robot that stands in line much as peopl...