Maximum Post-Glacial Marine Submergence in Northern Melville Peninsula

Maps the shore line during the peninsula's maximum submergence, from 1957-1958 field observations north of approx. 68 N. The limit of the post-glacial sea was determined by the highest altitudes at which marine shells and strandlines were found in various localities, and the lowest altitudes of undisturbed ground moraines and perched boulders; locations and altitudes for each of these criteria are mapped and tabulated. The sea rose to an altitude of about 450 ft over most of the region; it covered the low headlands and islands along the west coast (which approximated its present shape), the islands and Proterozoic lowland along the north coast, and the east coast to the steep scarp west of Hall Lake. On the northeast coast, altitudes averaged 100 ft lower than elsewhere, possibly due to the presence of residual ice. The marine limit on the peninsula lower than that (approx. 600 ft.) on Southampton is explained by a lingering ice mass centered over Foxe Basin. The area studied was depressed at least 1,100 ft under this ice mass and should rise another 650 ft

Maximum Postglacial Marine Submergence in Southern Melville Peninsula, N.W.T.

In a recent article the author discussed the limit of postglacial marine submergence in the northern part of Melville Peninsula. It was suggested that the marine limit in the area, as determined by a number of observations using four different criteria, varied between 450 and 500 feet. Of these four criteria only two, the lowest altitude at which undisturbed ground moraine and perched boulders occurred, were found to be particularly useful. Similar techniques were used during the summer of 1959 to determine the limit of postglacial submergence in the southern part of the peninsula. The observations there are limited to four altitudes in the Prince Albert Hills east of Lefroy Bay and to seven altitudes on the shores of the peninsula between Haviland Bay and Gore Bay. Two additional altitudes, one obtained by Burns near the mouth of Jenness River (the only observation on the east coast south of 68°N.) and the other by Mathiassen between Gore and Haviland bays, comprise all the available information. The location and altitude of each observation is plotted on the map, Fig. 1. ..

Measuring and Modeling of Urban Growth and Its Impacts On Vegetation and Species Habitats in Greater Orlando, Florida

Urban growth is widely regarded as an important driver of environmental and social problems. It causes the loss of informal open space and wildlife habitats. Timely and accurate assessments of future urban growth scenarios and associated environmental impacts are crucial for urban planning, policy decision, and natural resource management. In this study, five distinct scenarios ( no constraints , compact development , transit-oriented development , agriculture protection and environmental protection scenarios) were tested on Greater Orlando, Florida, along with conservation objectives and projections for future land use/cover from development demands. The study examined the consequences of alternative scenarios of urban growth on potential habitat loss for a suite of species and vegetation habitats. As a result, the maximum impact is projected in no constraints scenario while minimum impact occurred in Scenario 5 ( environmental protection ) across almost all vegetation and species habitats. The results indicated that the big challenge is how to manage compact growth to protect ecosystems. Florida has one of the biggest land acquisition programs in the US and a tradition in implementing sustainable development through growth management. The big challenge is how to allocate the fast-growing new population in the future along with these sustainable development objectives

mRUBiS: An Exemplar for Model-Based Architectural Self-Healing and Self-Optimization

Self-adaptive software systems are often structured into an adaptation engine that manages an adaptable software by operating on a runtime model that represents the architecture of the software (model-based architectural self-adaptation). Despite the popularity of such approaches, existing exemplars provide application programming interfaces but no runtime model to develop adaptation engines. Consequently, there does not exist any exemplar that supports developing, evaluating, and comparing model-based self-adaptation off the shelf. Therefore, we present mRUBiS, an extensible exemplar for model-based architectural self-healing and self-optimization. mRUBiS simulates the adaptable software and therefore provides and maintains an architectural runtime model of the software, which can be directly used by adaptation engines to realize and perform self-adaptation. Particularly, mRUBiS supports injecting issues into the model, which should be handled by self-adaptation, and validating the model to assess the self-adaptation. Finally, mRUBiS allows developers to explore variants of adaptation engines (e.g., event-driven self-adaptation) and to evaluate the effectiveness, efficiency, and scalability of the engines

Evolving the best-response strategy to decide when to make a proposal

Abstract-This paper designed and developed negotiation agents with the distinguishing features of 1) conducting continuous time negotiation rather than discrete time negotiation, 2) learning the response times of trading parties using Bayesian learning and, 3) deciding when to make a proposal using a multi-objective genetic algorithm (MOGA) to evolve their best-response proposing time strategies for different negotiation environments and constraints. Results from a series of experiments suggest that 1) learning trading parties' response times helps agents achieve more favorable trading results, and 2) on average, when compared with SSAs (Static Strategy Agents), BRSAs (Best-Response proposing time Strategy Agents) achieved higher average utilities, higher success rates in reaching deals, and smaller average negotiation time

Nucleotide Excision Repair Genes are Upregulated by Low-Dose Artificial Ultraviolet B: Evidence of a Photoprotective SOS Response?

Nucleotide excision repair is a major mechanism of defense against the carcinogenic effects of ultraviolet light. Ultraviolet B causes sunburn and DNA damage in human skin. Nucleotide excision repair has been studied extensively and described in detail at the molecular level, including identification of many nucleotide excision repair-specific proteins and the genes encoding nucleotide excision repair proteins. In this study, normal human keratinocytes were exposed to increasing doses of ultraviolet B from fluorescent sunlamps, and the effect of this exposure on expression of nucleotide excision repair genes was examined. An RNase protection assay was performed to quantify transcripts from nucleotide excision repair genes, and a slot blot DNA repair activity assay was used to assess induction of the nucleotide excision repair pathway. The activity assay demonstrated that cyclobutane pyrimidine dimers were removed efficiently after exposure to low doses of ultraviolet B, but this activity was delayed significantly at higher doses. All nucleotide excision repair genes examined demonstrated a similar trend: ultraviolet B induces expression of nucleotide excision repair genes at low doses, but downregulates expression at higher doses. In addition, we show that pre-exposure of cells to low-dose ultraviolet protected keratinocytes from apoptosis following high-dose exposure. These data support the notion that nucleotide excision repair is induced in cells exposed to low doses of ultraviolet B, which may protect damaged keratinocytes from cell death; however, exposure to high doses of ultraviolet B downregulates nucleotide excision repair genes and is associated with cell death