The Experts below are selected from a list of 252 Experts worldwide ranked by ideXlab platform
Paul Alan Cox - One of the best experts on this subject based on the ideXlab platform.
-
Competitive exclusion of Cyanobacterial species in the Great Salt Lake
Extremophiles, 2009Co-Authors: Hillary C. Roney, Gary M. Booth, Paul Alan CoxAbstract:The Great Salt Lake is separated into different salinity regimes by rail and vehicular Causeways. Cyanobacterial distributions map salinity, with Aphanothece halophytica proliferating in the highly saline northern arm (27% saline), while Nodularia spumigena occurs in the less saline south (6–10%). We sought to test if cyanobacterial species abundant in the north are competitively excluded from the south, and if southern species are excluded by the high salinity of the north. Autoclaved samples from the north and south sides of each causeway were inoculated with water from each area. Aphanothece, Oscillatoria, Phormidium , and Nodularia were identified in the culture flasks using comparative differential interference contrast, fluorescence, and scanning electron microscopy. Aphanothece halophytica occurred in all inocula, but is suppressed in the presence of Nodularia spumigena . N. spumigena was found only in inocula from the less saline waters in the south, and apparently cannot survive the extremely hypersaline waters of the northern arm. These data suggest that both biotic and abiotic factors influence cyanobacterial distributions in the Great Salt Lake.
Hugh Gladwin - One of the best experts on this subject based on the ideXlab platform.
-
hurricane evacuation route choice of major bridges in miami beach florida
Transportation Research Record, 2015Co-Authors: Arif Mohaimin Sadri, Pamela Murraytuite, Satish V. Ukkusuri, Hugh GladwinAbstract:Evacuation is a typical recourse to prevent loss of life if a high storm surge occurs, especially in hurricane-prone regions. Bridges are the key locations of bottlenecks. Because of the specific geographic shape and roadway network of Miami Beach, Florida, residents need to evacuate over one of the six major bridges or Causeways: MacArthur Causeway, Venetian Causeway, Julia Tuttle Causeway, John F. Kennedy Causeway, Broad Causeway, and Haulover Bridge. A mixed logit model is presented to identify the determining factors for evacuees from Miami Beach in selecting one of these bridges during a major hurricane. The model was developed by using data obtained from a survey that included a hypothetical Category 4 (major) hurricane scenario to reveal the most likely plans for evacuees from this area. The estimation findings suggest that the preference over a given bridge involves a complex interaction of variables, such as distance to reach the evacuation destination, evacuation-specific characteristics (evacuation day, time, mode, and destination), and evacuee-specific characteristics (gender, race, evacuation experience, and living experience). The normally distributed random parameters in the model account for the existence of unobserved heterogeneity across different observations. The findings of this study will help emergency officials and policy makers to develop efficient operational measures and better evacuation plans for a major hurricane by determining different fractions of people taking each of the six bridges.
Hillary C. Roney - One of the best experts on this subject based on the ideXlab platform.
-
Competitive exclusion of Cyanobacterial species in the Great Salt Lake
Extremophiles, 2009Co-Authors: Hillary C. Roney, Gary M. Booth, Paul Alan CoxAbstract:The Great Salt Lake is separated into different salinity regimes by rail and vehicular Causeways. Cyanobacterial distributions map salinity, with Aphanothece halophytica proliferating in the highly saline northern arm (27% saline), while Nodularia spumigena occurs in the less saline south (6–10%). We sought to test if cyanobacterial species abundant in the north are competitively excluded from the south, and if southern species are excluded by the high salinity of the north. Autoclaved samples from the north and south sides of each causeway were inoculated with water from each area. Aphanothece, Oscillatoria, Phormidium , and Nodularia were identified in the culture flasks using comparative differential interference contrast, fluorescence, and scanning electron microscopy. Aphanothece halophytica occurred in all inocula, but is suppressed in the presence of Nodularia spumigena . N. spumigena was found only in inocula from the less saline waters in the south, and apparently cannot survive the extremely hypersaline waters of the northern arm. These data suggest that both biotic and abiotic factors influence cyanobacterial distributions in the Great Salt Lake.
Diane Z. Chase - One of the best experts on this subject based on the ideXlab platform.
-
Interpreting Ancient Maya Society Through Neighborhoods:
2015Co-Authors: Arlen F. Chase, Diane Z. ChaseAbstract:The 2013 season of the Caracol Archaeological Project constituted the second field season of a three-year settlement sub-program designed to analyze an ancient Maya neighborhood. This research builds on a long-standing research interest by the project on Maya residential settlement at Caracol, Belize. However, unlike settlement studies in the Maya area that have sought to sample the widely dispersed residential remains found at most Maya sites through the use of test-pits (e.g., Sabloff 1990), the recent Caracol settlement work combines test excavations with more intensive investigation focused on providing an assessment of the temporal, functional, and spatial dimensions of past social interactions. Previous research on Caracol’s residential groups began with sampling techniques that were similar to those used in most other Maya settlement studies (Puleston 1983; Rice and Rice 1990; Tourtellot 1988). The first settlement work by the current project at the site was undertaken from 1987 through 1989; a sample of residential units was investigated, primarily with test-pits, along the sides of the Conchita Causeway (Jaeger 1987, 1991, 1994). These data were augmented by the investigation of additional residential groups located between the Conchita and Pajaro-Ramonal Causeways, again primarily through the use of test excavations (A. Chase and D. Chase 1989; D. Chase and A. Chase 2002). Following this research, another focused settlement sub-program was undertaken in the northeastern sector of Caracol
-
ANCIENT MAYA Causeways AND SITE ORGANIZATION AT CARACOL, BELIZE
Ancient Mesoamerica, 2001Co-Authors: Arlen F. Chase, Diane Z. ChaseAbstract:Statements concerning the function of intrasite Maya Causeways often focus on inferred ritual purposes or on symbolic kinship alliances rather than on the more practical roles that such roads may have served. Data collected on an extensive intrasite causeway system at Caracol, Belize, demonstrate that the primary role of its sacbe s lay in facilitating the administrative control of people, goods, and services. An estimated 75 km of roads not only served intrasite communication and transport; they also affected the political and economic integration of this huge center.
Alasdair Kennedy - One of the best experts on this subject based on the ideXlab platform.
-
In search of the ‘true prospect’: making and knowing the Giant's Causeway as a field site in the seventeenth century
The British Journal for the History of Science, 2007Co-Authors: Alasdair KennedyAbstract:AbstractThe phenomenon of the Giant's Causeway in the north of Ireland has attracted much attention over five centuries. This essay recounts the formative years between 1688 and 1708 of the Giant's Causeway as a field site and ‘philosophical landscape’ in the light of recent research on the historical geographies of scientific knowledge. This research has provided new perspectives on field science, emphasizing the spatial character of the field and its discursive formation in different spaces. A view of the field as a self-contained unit in which science is practised is rendered problematic. Instead, it is seen as part of a network of intersecting locales within which scientists and science circulate. This essay draws upon this work, exploring and mapping the spaces and techniques used by late seventeenth-century natural philosophers in London and Dublin to generate observational and conceptual knowledge of the Giant's Causeway. In doing so, the paper contributes to an understanding of the spaces of natural philosophy in the seventeenth century, of the knowledge networks within which the virtuosi operated and of the earth science field site.