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Articles 331 - 360 of 3030
Full-Text Articles in Physical Sciences and Mathematics
Determination Of Cabergoline By Electrospray Ionization Tandem Mass Spectrometry: Picogram Detection Via Column Focusing Sample Introduction, Bruce A. Kimball, Thomas J. Deliberto, John J. Johnston
Determination Of Cabergoline By Electrospray Ionization Tandem Mass Spectrometry: Picogram Detection Via Column Focusing Sample Introduction, Bruce A. Kimball, Thomas J. Deliberto, John J. Johnston
United States Department of Agriculture Wildlife Services: Staff Publications
An electrospray ionization tandem mass spectrometric method was developed for low-picogram detection of an ergot alkaloid, cabergoline, in coyote plasma extracts. Cabergoline is under investigation as an abortifacient in canid species. Central to the successful development of this method was the ability to introduce relatively large sample volumes into the mass spectrometer. This was achieved by focusing the analyte on a conventional high-performance liquid chromatography guard column prior to elution into the spectrometer. Volumes up to at least 900 μL could be injected onto the guard column using a 100% aqueous mobile phase. Cabergoline retained on the column was eluted …
Seawater Temperature Trends At Usa Tide Gauge Sites, George A. Maul, Andria M. Davis, Jeffrey W. Simmons
Seawater Temperature Trends At Usa Tide Gauge Sites, George A. Maul, Andria M. Davis, Jeffrey W. Simmons
Ocean Engineering and Marine Sciences Faculty Publications
Seawater temperatures have been measured at United States tide gauges throughout most of the 20th century. All available records have been digitized, and the longest 14 have been analyzed by linear least-square regression. The largest positive trend is from Boston MA (+3.6 ± 0.4°C per century), and the largest negative trend is at Charleston SC (-0.1 ± 0.3°C per century). No consistent latitudinal or eastcoast vs. west-coast patterns are discernable, but air temperature trends are typically greater than seawater changes.
Mapping Of The Bethe Surface In Single-Ionization Ion-Atom Collisions, Ronald E. Olson, J. Fiol
Mapping Of The Bethe Surface In Single-Ionization Ion-Atom Collisions, Ronald E. Olson, J. Fiol
Physics Faculty Research & Creative Works
The three-body Coulomb problem is explored using classical-trajectory Monte Carlo and continuum distorted-wave methods that include all interactions, including the nuclear-nuclear term. Calculations for low-energy electron emission as a function of projectile deflection, the Bethe surface, are compared with experiment for single ionization of He by 100 MeVu-1 C6+ and 3.6 MeV u-1 Au53+. Good agreement is realized for the C6+ system. For Au53+ poor agreement with experiment is obtained, indicating that the proposed lack of the nuclear-nuclear interaction is not the source of the discrepancy. The calculations further show that significant cross sections …
Oral History Interview With Donald D. Chamberlin, Philip L. Frana
Oral History Interview With Donald D. Chamberlin, Philip L. Frana
Philip L Frana
Don Chamberlin is a research staff member at IBM Almaden Research Center in San Jose, California. In this oral history Chamberlin recounts his early life, his education at Harvey Mudd College and Stanford University, and his work on relational database technology. Chamberlin was a member of the System R research team and, with Ray Boyce, developed the SQL database language. Chamberlin also briefly discusses his more recent research on XML query languages.
Assessing Hybrid Classes In A Flexible Learning Environment, M. Lawrence-Slater
Assessing Hybrid Classes In A Flexible Learning Environment, M. Lawrence-Slater
Faculty of Informatics - Papers (Archive)
This paper describes the development of a regime comprising a teaching platform and associated assessment processes. The objective behind these is to enable the equitable assessment of student assignments in hybrid courses. In this paper, the term hybrid refers to courses where the student body comprises both campus-based and off-campus students. Additionally, in either of these groups students may elect to undertake their studies using online resources rather than attend in person. The paper commences with a background discussion on the problem and reasons for seeking alternative approaches to teaching and assessment in hybrid courses. This is followed by a …
Structural Evidence That The Methionyl Aminopeptidase From Escherichia Coli Is A Mononuclear Metalloprotease, Nathaniel J. Cosper, Ventris M. D'Souza, Robert A. Scott, Richard C. Holz
Structural Evidence That The Methionyl Aminopeptidase From Escherichia Coli Is A Mononuclear Metalloprotease, Nathaniel J. Cosper, Ventris M. D'Souza, Robert A. Scott, Richard C. Holz
Chemistry Faculty Research and Publications
The Co and Fe K-edge extended X-ray absorption fine structure (EXAFS) spectra of the methionyl aminopeptidase from Escherichia coli (EcMetAP) have been recorded in the presence of 1 and 2 equiv of either Co(II) or Fe(II) (i.e., [Co(II)_(EcMetAP)], [Co(II)Co(II)(EcMetAP)], [Fe(II)_(EcMetAP)], and [Fe(II)Fe(II)(EcMetAP)]). The Fourier transformed data of both [Co(II)_(EcMetAP)] and [Co(II)Co(II)(EcMetAP)] are dominated by a peak at ca. 2.05 Å, which can be fit assuming 5 light atom (N,O) scatterers at 2.04 Å. Attempts to include a Co−Co interaction (in the 2.4−4.0 Å range) in the …
A Two-Dimensional Lattice Model With Exact Supersymmetry, Simon Catterall, S. Karamov
A Two-Dimensional Lattice Model With Exact Supersymmetry, Simon Catterall, S. Karamov
Physics - All Scholarship
Starting from a simple discrete model which exhibits a supersymmetric invariance we construct a local, interacting, two-dimensional Euclidean lattice theory which also admits an exact supersymmetry. This model is shown to correspond to the Wess-Zumino model with extended N=2 supersymmetry in the continuum. We have performed dynamical fermion simulations to check the spectrum and supersymmetric Ward identities and find good agreement with theory.
The Evidence Of The Mode Selectivity Of The Infrared Predissociation Reaction Of The Hydrogen Bonds In The Aniline–Water–Pyrrole Cluster Cation, Taisuke Nakanaga, Naveed Piracha, Fumiyuki Ito
The Evidence Of The Mode Selectivity Of The Infrared Predissociation Reaction Of The Hydrogen Bonds In The Aniline–Water–Pyrrole Cluster Cation, Taisuke Nakanaga, Naveed Piracha, Fumiyuki Ito
Naveed K. Piracha
The infrared spectrum of aniline–water–pyrrole cluster cation has been measured in the 3 μm region. Four strong vibrational bands were observed at 3313, 3515, 3637, and 3721cm−1, and the cluster dissociated into fragments in two reaction paths, AWP+→AW++P and AWP+→AP++W (A: aniline, W: water, P: pyrrole) when it absorbed an infrared photon. The branching ratio (AW+/AP+) has been determined to be 0.20±0.02 for the NH stretching vibration of aniline (3313cm−1, hydrogen-bonded to pyrrole) and 0.14±0.03 for the other three bands. This vibrational mode dependence should be due to the fast energy transfer from the NH to the intermolecular vibration through …
Collaborative Research: Chemical Equilibria Involving Iron And Hydrogen In Metapelites From Western Maine, Charles V. Guidotti
Collaborative Research: Chemical Equilibria Involving Iron And Hydrogen In Metapelites From Western Maine, Charles V. Guidotti
University of Maine Office of Research Administration: Grant Reports
The primary goal of this research is to evaluate the chemical equilibria involving ferrous and ferric iron and hydrogen in metapelitic rocks from western Maine and related rocks at Black Mountain, New Hampshire. We will study samples from graphite, magnetite, and hematite-bearing rocks at three different metamorphic grades: garnet, lower sillimanite, and staurolite zone. This will permit the determination of:
(1) in situ partition coefficients for Fe3+ and Fe2+ among all the Fe-bearing phases and for H among hydrous phases;
(2) the temperature and fO2 dependence of Fe3+/Fetotal and effects of Fe3+ substitution on other cation substitutions plus their implications …
The Planetary Nebula A39: An Observational Benchmark For Numerical Modeling Of Photoionized Plasmas, George H. Jacoby, Gary J. Ferland, Kirk T. Korista
The Planetary Nebula A39: An Observational Benchmark For Numerical Modeling Of Photoionized Plasmas, George H. Jacoby, Gary J. Ferland, Kirk T. Korista
Physics and Astronomy Faculty Publications
Galactic nebulae are the main probes for the chemical evolution of the interstellar medium. Yet, recent observations have shown that chemical abundances determined from recombination and collisionally excited emission lines can differ by as much as an order of magnitude in some planetary nebulae (PNs). Many PNs have complex geometries and morphological evidence for interactions from stellar winds, and it is not clear to what extent winds, inhomogeneities, or shocked gas affect the observed spectrum. There currently is no full explanation for this discrepancy, which brings into question whether we understand the physical state of these low-density plasmas at all. …
Keeping A Global Technology Working: A Study Into The Social And Technical Dimensions Of Broadcast Engineering In The Pacific Islands, William Tibben
Keeping A Global Technology Working: A Study Into The Social And Technical Dimensions Of Broadcast Engineering In The Pacific Islands, William Tibben
Faculty of Informatics - Papers (Archive)
This paper is primarily concerned with exploring the technical and social dimensions of problem solving undertaken by technical staff in a Pacific Island radio station. Essentially, the paper addresses the question "what influence do physical and social contexts have on engineering knowledge development?". The paper notes that the concept of context is not given significant attention when looking to dominant philosophies of engineering. This stands in contrast to the importance accorded to context in development literature, particularly in. relation to technological knowledge. Using Macdonald's research into the role of information in innovation, the paper identifies a number of factors besides …
Towards Securing 3g Mobile Phones, R. Safavi-Naini, Willy Susilo, G. Taban
Towards Securing 3g Mobile Phones, R. Safavi-Naini, Willy Susilo, G. Taban
Faculty of Informatics - Papers (Archive)
Third-generation (3G) mobile phones are capable of high data rate Internet connection and promise seamless connectivity for a free roaming user. They can provide an "always on" Internet, and make a range of services, traditionally available on desktop computers, accessible to mobile users, irrespective of their location. Providing adequate security for these phones and the services that they offer is a central concern for their acceptability and uptake. We briefly review the security of second generation mobile phones and then discuss security architecture proposed for 3G phones. The new security issues that are of importance because of the combination of …
The Cataclysmic Variable Cw 1045+525: A Secondary-Dominated Dwarf Nova?, C. Tappert, J. R. Thorstensen, W. H. Fenton, N. Bennert
The Cataclysmic Variable Cw 1045+525: A Secondary-Dominated Dwarf Nova?, C. Tappert, J. R. Thorstensen, W. H. Fenton, N. Bennert
Dartmouth Scholarship
We present spectroscopic and photometric observations of the cataclysmic variable CW 1045+525. Both the optical spectrum and the photometric lightcurve show a strong contribution of a K5V–M0V secondary. We derive an orbital period Porb = 0.271278(1) d by measuring the radial velocities of the absorption lines of the secondary. The period and spectral type of the secondary suggest a distance of 350–700 pc. There is evidence for additional sources of line- and continuum emission, but no direct evidence of an accretion disc. We discuss several scenarios for the nature of CW 1045+525 on the basis of our results, finding a …
Temporary Anion States Of Selected Amino Acids, Kayvan Aflatooni, B. Hitt, Gordon A. Gallup, Paul Burrow
Temporary Anion States Of Selected Amino Acids, Kayvan Aflatooni, B. Hitt, Gordon A. Gallup, Paul Burrow
Paul Burrow Publications
Vertical attachment energies for the formation of low-lying temporary anion states of glycine, alanine, phenylalanine, tryptophan, and proline in the gas phase are reported using electron transmission spectroscopy. Electron attachment into the empty π* orbital of the –COOH group was observed in all the compounds. Temporary anion states associated with the side groups in phenylalanine and tryptophan are found to be stabilized with respect to those in the reference compounds toluene and indole, respectively, by approximately 0.2 eV. We attribute this to electrostatic effects and explore, using simple theoretical models, the extent to which such anion states could be further …
Teaching Analytical Chemistry To The Masses: How We Went From 2 Courses To 7 Courses In 10 Years, Gary Long, Mark Anderson, Brian Tissue, John Morris
Teaching Analytical Chemistry To The Masses: How We Went From 2 Courses To 7 Courses In 10 Years, Gary Long, Mark Anderson, Brian Tissue, John Morris
Mark R. Anderson
No abstract is currently available.
Interactive Multimedia Over The Internet For Teaching Analytical Chemistry, Mark Anderson
Interactive Multimedia Over The Internet For Teaching Analytical Chemistry, Mark Anderson
Mark R. Anderson
No abstract is currently available.
Two Different One-Dimensional Structural Motifs In The Same Coordination Polymer: A Novel Interpenetration Of Infinite Ladders By Bundles Of Infinite Chains, Badruz Zaman, Mark D. Smith, Hans Conrad Zur Loye
Two Different One-Dimensional Structural Motifs In The Same Coordination Polymer: A Novel Interpenetration Of Infinite Ladders By Bundles Of Infinite Chains, Badruz Zaman, Mark D. Smith, Hans Conrad Zur Loye
Faculty Publications
A coordination polymer with a novel structural motif
consisting of stacks of infinite ladders interpenetrated by
bundles of infinite chains is described; geometrical arguments
are made for the requirements that can lead to such
interpenetration as a function of ligand dimensions.
On Multiple Watermarking, Nicholas Paul Sheppard, Reihaneh Safavi-Naini, Philip Ogunbona
On Multiple Watermarking, Nicholas Paul Sheppard, Reihaneh Safavi-Naini, Philip Ogunbona
Faculty of Informatics - Papers (Archive)
Mintzer and Braudaway once asked: If one watermark is good, are more better? In this paper, we discuss some techniques for embedding multiple watermarks into a single multimedia object and report some observations on implementations of these techniques.
Computational Geometry Column 42, Joseph S. B. Mitchell, Joseph O'Rourke
Computational Geometry Column 42, Joseph S. B. Mitchell, Joseph O'Rourke
Computer Science: Faculty Publications
A compendium of thirty previously published open problems in computational geometry is presented.
Evaluation Of Chemical Repellents For Reducing Crop Damage By Dickcissels In Venezuela, M. L. Avery, E. A. Tillman, C.C. Lauker
Evaluation Of Chemical Repellents For Reducing Crop Damage By Dickcissels In Venezuela, M. L. Avery, E. A. Tillman, C.C. Lauker
United States Department of Agriculture Wildlife Services: Staff Publications
In Venezuela, lethal control of wintering Dickcissels (Spiza americana) is considered a threat to the species survival. To help farmers protect their rice and sorghum crops from depredations by Dickcissels and to minimize the killing of large numbers of these birds, alternative non-lethal crop protection measures are needed. To that end, the responses of captive Dickcissels to three bird-repellent chemicals applied to rice seed were evaluated. In one-cup feeding trials, treatments of methiocarb (0.05% g g-1, applied as Mesurol® 75% wettable powder) and anthraquinone (0.5%, applied as Flight Control® ) reduced consumption of rice by 70% …
The Origin Of A Polar Ice Sheet In East Antarctica, George H. Denton
The Origin Of A Polar Ice Sheet In East Antarctica, George H. Denton
University of Maine Office of Research Administration: Grant Reports
This award supports a study to determine the sequence and chronology of events that led to the development of the Antarctic ice sheet. A continental-scale ice sheet probably first developed in East Antarctica close to the Eocene-Oligocene boundary under temperate climatic conditions. The purpose of this project is to determine, from landscape analysis (with a numerical chronology), when (and why) these early temperate conditions gave way to a polar environment in Antarctica. From previous field work and recent photographic analysis, an extensive relict landscape (older than 17 million years) with landforms and erosional features characteristic of temperate glaciation has been …
Search For First-Generation Scalar And Vector Leptoquarks, V. M. Abazov, Gregory R. Snow, D0 Collaboration
Search For First-Generation Scalar And Vector Leptoquarks, V. M. Abazov, Gregory R. Snow, D0 Collaboration
Gregory Snow Publications
We describe a search for the pair production of first-generation scalar and vector leptoquarks in the ee j j and eν jj channels by the DO. Collaboration. The data are from the 1992–1996 pp̅ run at √s =1.8 TeV at the Fermilab Tevatron collider. We find no evidence for leptoquark production; in addition, no kinematically interesting events are observed using relaxed selection criteria. The results from the ee j j and eν jj channels are combined with those from a previous DO. analysis of the νν jj channel to obtain 95% confidence level (C.L.) upper limits on the leptoquark …
Relativistic Effects And Two-Body Currents In 2h(E⃗,E′P)N Using Out-Of-Plane Detection, Z L. Zhou, X Jiang, R Hicks, A Hotta, R Miskimen, Gerald Alvin Peterson, J Shaw
Relativistic Effects And Two-Body Currents In 2h(E⃗,E′P)N Using Out-Of-Plane Detection, Z L. Zhou, X Jiang, R Hicks, A Hotta, R Miskimen, Gerald Alvin Peterson, J Shaw
Gerald Alvin Peterson
Measurements of the 2H(e⃗,e′p)n reaction were performed with the out-of-plane magnetic spectrometers (OOPS) at the MIT-Bates Linear Accelerator. The longitudinal-transverse, fLT and fLT′, and the transverse-transverse, fTT, interference responses at a missing momentum of 210MeV/c were simultaneously extracted in the dip region at Q2 = 0.15 (GeV/c)2. In comparison to models of deuteron electrodisintegration, the data clearly reveal strong effects of relativity and final-state interactions and the importance of two-body meson-exchange currents and isobar configurations. We demonstrate that such effects can be disentangled by extracting these responses using the novel out-of-plane technique.
A Differential Equation Model Of North American Cinematic Box-Office Dynamics, David A. Edwards, Ron Buckmire
A Differential Equation Model Of North American Cinematic Box-Office Dynamics, David A. Edwards, Ron Buckmire
Ron Buckmire
No abstract provided.
Statistics And Supermetallicity: The Metallicity Of Mu Leonis, B. J. Taylor
Statistics And Supermetallicity: The Metallicity Of Mu Leonis, B. J. Taylor
Faculty Publications
For the often-studied "SMR" giant µ Leo, Smith & Ruck (2000) have recently found that [Fe/H] approximately + 0.3 dex. Their conclusion is tested here in a "statistical" paradigm, in which statistical principles are used to select published high-dispersion µ Leo data and assign error bars to them. When data from Smith & Ruck and from Takeda et al. (1998) are added to a data base compiled in 1999, it is found that conclusions from an earlier analysis (Taylor 1999c) are essentially unchanged: the mean value of [Fe/H] approximately + 0.23 ± 0.025 dex, and values ≤ + 0.2 dex …
The Virginia Wetlands Report Vol. 16, No. 3, Virginia Institute Of Marine Science
The Virginia Wetlands Report Vol. 16, No. 3, Virginia Institute Of Marine Science
Virginia Wetlands Reports
- Diamondback Terrapin. Walter I. Priest, III
- A GIS approach for Targeting Potential Wetlands Mitigation or Restoration Sites. Marcia Berman and Tamia Rudnicky
- Bay Managers Eye Recently Permitted SAV Losses. Lyle Varnell and Jay Woodward
- Through the Years in Virginia’s Wetlands: Days in the Field. Gene M. Silberhorn
Poor Water Resources And Drought In The Gujarat/Saurashtra Regions Of India, K. K. Nathan
Poor Water Resources And Drought In The Gujarat/Saurashtra Regions Of India, K. K. Nathan
Drought Network News (1994-2001)
Inadequate water resources pose a big threat to the economy, human activities, and livelihood in the Gujarat/Saurashtra regions of India. Scanty rainfall with wide aberrations in its distribution has made the situation worse, leading to chronic drought in the state in 2001. With the exception of the Narmada and Tapi rivers, there are hardly any water resources to sustain agricultural production in the region. The gradual disappearance of forest cover in the state has further aggravated the drought situation. This has led to large-scale erosion of the topsoil, particularly near the riverside. There is apprehension that the region will soon …
Creating A Network Of Regional Drought Preparedness Networks: A Call For Action, Donald A. Wilhite
Creating A Network Of Regional Drought Preparedness Networks: A Call For Action, Donald A. Wilhite
Drought Network News (1994-2001)
Drought is a creeping, slow-onset natural hazard that is a normal part of climate for virtually all regions of the world; it results in serious economic, social, and environmental impacts. Its onset and end are often difficult to determine, as is its severity. Drought affects more people than any other natural hazard. Lessons from developed and developing countries demonstrate that drought results in significant impacts, regardless of level of development, although the character of these impacts will differ profoundly. At the Meeting on Opportunities for Sustainable Investment in Rainfed Areas of West Asia and North Africa (WANA), held in June …
Water Current, Volume 33, No. 5. October 2001
Water Current, Volume 33, No. 5. October 2001
Water Current Newsletter
• Research Indicates Sprinkler Irrigation Use Could Reduce Groundwater Nitrate Levels by Steve Ress • From the Director • Meet the Faculty • Time for Change on the Missouri River by Chad Smith • Four States Irrigation Council Tour Visits Western Kansas in July by Steve Ress • Pumpkin Creek Surface-Ground Water Dispute by J. David Aiken • Water Issues in 2001 by Tim Anderson • Water News Briefs
Sequential Searches: Proofreading, Russian Roulette, And The Incomplete Q-Eulerian Polynomials Revisited, Don Rawlings
Sequential Searches: Proofreading, Russian Roulette, And The Incomplete Q-Eulerian Polynomials Revisited, Don Rawlings
Mathematics
No abstract provided.