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Articles 211 - 224 of 224
Full-Text Articles in Physical Sciences and Mathematics
Cover - Table Of Contents
Journal of the Iowa Academy of Science: JIAS
No abstract provided.
Editorial Board & Iowa Academy Of Science Officers And Directors
Editorial Board & Iowa Academy Of Science Officers And Directors
Journal of the Iowa Academy of Science: JIAS
No abstract provided.
Hydrogeology Of The Devonian-Silurian Carbonate Aquifer, Northern Cedar Rapids, Iowa, Keith E. Schilling
Hydrogeology Of The Devonian-Silurian Carbonate Aquifer, Northern Cedar Rapids, Iowa, Keith E. Schilling
Journal of the Iowa Academy of Science: JIAS
The hydrogeology of the Devonian-Silurian carbonate aquifer was investigated at a hazardous waste site in northern Cedar Rapids, Iowa. Data collected at the project site included bedrock cores, specific capacity measurements in discrete packer intervals and monitoring wells, hydraulic-head measurements and groundwater samples collected from select Devonian and Silurian wells.
Conceptual Basis For An Index Of Forest Integrity For Upland Coastal Plain Ecosystems, Nicholas R. Brown, Brian Roy Lockhart, Philip A. Tappe, Lynne C. Thompson, Robert C. Weih Jr., Richard A. Williams
Conceptual Basis For An Index Of Forest Integrity For Upland Coastal Plain Ecosystems, Nicholas R. Brown, Brian Roy Lockhart, Philip A. Tappe, Lynne C. Thompson, Robert C. Weih Jr., Richard A. Williams
Journal of the Arkansas Academy of Science
Following the recent trend to manage natural resources for "sustainability," ecologists, resource managers and policymakers are beginning to think of the management of forest ecosystems in terms of "ecosystem health" or "ecosystem integrity." Biologists are increasingly recognizing that use of chemical assays in assessing the condition of an ecosystem has limited value, and that biological factors, e.g., species diversity and composition, can be useful characters in the analysis of "biotic integrity." An index of biotic integrity (IBI) has been developed for riverine ecosystems in the Midwest U.S., using fish species diversity, indicator population analysis, trophic structure assessment, and physiological abnormalities …
Energy-Loss Particle Identification In 2-D Silicon Drift Detectors, G. Douglas Maudlin, A. A. Rollefson, Wilfred J. Braithwaite
Energy-Loss Particle Identification In 2-D Silicon Drift Detectors, G. Douglas Maudlin, A. A. Rollefson, Wilfred J. Braithwaite
Journal of the Arkansas Academy of Science
A relatively new type of transducer known as the Silicon Drift Detector (SDD) has been fabricated onto thin silicon wafers. SDD operates like a miniature, high-resolution, 2-D Time-projection chamber. One of these devices can detect two dimensions of an ionizing particle's position, and its integrated electrical charge output level isproportional to the particle's energy loss through the silicon. An array ofSDD's, arranged in three coaxial cylinders, is being considered as part of an instrument surrounding the beam pipe of highly-relativistic colliding beam facility, where it would be used to simultaneously track individual paths of thousands of charged particles emerging from …
On Some Cave Minerals From Northern Norway, Bogdan Petroniu Onac, Stein-Erik Lauritzen
On Some Cave Minerals From Northern Norway, Bogdan Petroniu Onac, Stein-Erik Lauritzen
International Journal of Speleology
The present paper aims to point out the results of 31 samples from some Norwegian caves that have been analysed with respect to their mineralogical composition. Identification of the minerals was done by X-ray diffraction, thermal, infrared spectroscopy and scanning electron microscopy. Seventeen minerals were identified belonging to 4 groups: carbonates, sulphates, oxides-hydroxides and silicates.
Learning Via Queries With Teams And Anomalies, William I. Gasarch, Efim Kinber, Mark G. Pleszkoch, Carl H. Smith, Thomas Zeugmann
Learning Via Queries With Teams And Anomalies, William I. Gasarch, Efim Kinber, Mark G. Pleszkoch, Carl H. Smith, Thomas Zeugmann
School of Computer Science & Engineering Faculty Publications
Most work in the field of inductive inference regards the learning machine to be a passive recipient of data. In a prior paper the passive approach was compared to an active form of learning where the machine is allowed to ask questions. In this paper we continue the study of machines that ask questions by comparing such machines to teams of passive machines. This yields, via work of Pitt and Smith, a comparison of active learning with probabilistic learning. Also considered are query inference machines that learn an approximation of what is desired. The approximation differs from the desired result …
The Divided Information Superhighway, Robert Kuttner
The Divided Information Superhighway, Robert Kuttner
Maine Policy Review
This issue marks the introduction of the Margaret Chase Smith Essay, which will be a feature in each issue honoring Sen. Smith by focusing on issues related to citizenship, ethics in government, and integrity as a virtue of public leadership. In this first essay, economist Robert Kuttner asks some important ethical questions about the new world of electronic communications. He suggests that who plays and who pays are very important issues that have not been adequately considered in the highly technical and competitive world that will mark the 21st century. [This essay originally appeared as a column in the …
Electric Market Restructuring: Environmental Considerations, Armond Cohen
Electric Market Restructuring: Environmental Considerations, Armond Cohen
Maine Policy Review
In the past few years,Maine's electric utilities have begun to face the forces of competition.Maineis experiencing the effects of a national trend, a shift from a traditional and regulated system to a more innovative and competitive one. Armond Cohen explores the environmental impacts that are at stake in restructuring and offers some possible solutions. This article is taken from the author’s presentation at a December 1994 conference entitled ”Retail Wheeling,” sponsored by the Margaret Chase Smith Center for Public Policy's Project for the Study of Regulation and the Environment.
Evolution Of Maine’S Electric Utility Industry, 1975-1995, Carroll R. Lee, Richard C. Hill
Evolution Of Maine’S Electric Utility Industry, 1975-1995, Carroll R. Lee, Richard C. Hill
Maine Policy Review
Recent articles in Maine Policy Review have focused on the sweeping changes taking place in Maine’s electric industry. We continue the dialogue with this article by Carroll Lee, Vice President-Operations at Bangor Hydro-Electric Company and Richard Hill, retired University of Maine Professor. Lee and Hill trace the electric industry evolution back 20 years and offer a comprehensive and integrated perspective on how this industry has progressed from a monopoly to one with significant elements of competition.
Why Conservation Matters And What We Can Do About It, John C. Sawhill
Why Conservation Matters And What We Can Do About It, John C. Sawhill
Maine Policy Review
While environmental and economic needs have long been considered to be in direct opposition to one another, a new approach to environmental conservation is emerging. Called the "ecosystem" approach, it focuses not only on protecting the environment and its species, but also seeks new ways of balancing these interests with human needs. The article is drawn from a speech delivered by John C. Sawhill at the Summer Lecture Series of the College of the Atlantic,Bar Harbor,Maine, on August 2, 1994. Sawhill outlines the conservation principles that guide The Nature Conservancy and provides examples of how the ecosystem approach has led …
The Complexities Of Decision-Making Related To Health Risk Assessments, Barbara A. Knuth
The Complexities Of Decision-Making Related To Health Risk Assessments, Barbara A. Knuth
Maine Policy Review
Maine, like the nation, has focused a great deal of recent attention on determining acceptable levels of environmental and human health risk. Barbara discusses the role and uses of scientific information in risk assessment and public policy debate. Similar to Kevin Boyle's previous article (featured in the December 1994 issue of Maine Policy Review), Knuth discusses the 1992 Maine Board of Environmental Protection hearings which focused on the human consumption of fish potentially contaminated with dioxin.