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Articles 2311 - 2340 of 7616
Full-Text Articles in Physical Sciences and Mathematics
Canopy Cover Prediction From Stand Density Attributes: Stocking, Crown Width, And Overlap Functions, Andrew Gray, Anne Mcintosh, Steve Garman
Canopy Cover Prediction From Stand Density Attributes: Stocking, Crown Width, And Overlap Functions, Andrew Gray, Anne Mcintosh, Steve Garman
North American Forest Ecology Workshop
The goals for a wide range of forest management objectives are often stated in terms of the amount and layering of canopy cover. However, measuring canopy cover is labor intensive and different techniques provide widely different estimates. Several approaches have been developed to predict cover from common tree or stand-level density attributes, with varying results. This study used line-intercept measured tree cover from 1,424 Forest Inventory and Analysis (FIA) plots across Oregon to build predictive models from estimates of tree stocking, crown width, and other stand attributes (mean diameter, stand height, SDI, etc.). A variety of adjustments were applied to …
Influence Of Coarse Woody Material (Cwm) On Soil Microarthropods In Black Spruce-Feather Moss Forests Of Western Quebec, Enrique Doblas-Miranda, Timothy T. Work
Influence Of Coarse Woody Material (Cwm) On Soil Microarthropods In Black Spruce-Feather Moss Forests Of Western Quebec, Enrique Doblas-Miranda, Timothy T. Work
North American Forest Ecology Workshop
Increasing demands for biofuels have opened the possibility for an overall decrease in the amount of residual coarse woody material (CWM) in forests. While CWM is known to be an important resource for saproxylic species that reside within downed logs, the relative importance of CWM for organisms residing beneath, in the soil is poorly understood. In this context, CWM likely modifies conditions as well as nutrient levels for soil communities that lie beneath. The relative importance of CWM for underlying soil communities may be accentuated in the black-spruce clay-belt region of Western Québec where soil nutrients are extremely limited by …
Effects Of Regeneration Practices On The Growth In Loblolly Pine Plantations From The Perspective Of Hierarchy Theory, Thomas Dean, D.Andrew Scott, Gorden Holley
Effects Of Regeneration Practices On The Growth In Loblolly Pine Plantations From The Perspective Of Hierarchy Theory, Thomas Dean, D.Andrew Scott, Gorden Holley
North American Forest Ecology Workshop
The long-term effects of high-production harvesting and subsequent site-preparation practices are typically evaluated from a limiting resource perspective. Machines used in the harvesting compact the soil reducing aeration and uptake of water and nutrients. Moving the entire tree from the site removes organic matter and parts of the forest floor. Models translate these effects into direct consequences on tree growth and ultimately productivity. Trees response often conflicts with model predictions in many cases. Hierarchy theory does not require organisms to behave deterministically to account for behavior, but it does require a different approach. Our proposed talk will present an application …
Forest Ecosystem Dynamics In A Non-Linear World, Sybille Haeussler
Forest Ecosystem Dynamics In A Non-Linear World, Sybille Haeussler
North American Forest Ecology Workshop
Forest ecosystems across North America are under increasing stress from the accelerating pace of global change which involves simultaneous changes in resource availability (temperature, moisture, nutrients), disturbance regimes (fire, insects, diseases, extreme weather, logging, urbanization) and (3) species distributions (invasive organisms, threatened species). Interactions among the agents of global change can generate emergent or unexpected ecosystem behaviour. Complex systems science provides a strong theoretical foundation for understanding these factor interactions and provides many new mathematical and simulation modeling tools that can generate complex, non-linear behaviour and provide improved understanding of ecosystem response to global change. I present an updated version …
Seven-Year Results Of Testing Paper Mill Residual Sludge As A Soil Ameliorant Of Iron Mine Tailings, M. Bridgen
Seven-Year Results Of Testing Paper Mill Residual Sludge As A Soil Ameliorant Of Iron Mine Tailings, M. Bridgen
North American Forest Ecology Workshop
Paper mill residual solids, extracted from a settling pond in Newton Falls, NY, were tested for their efficacy as a site ameliorant. The test site was a twenty-five-year-old sand tailings, created by a former iron mining operation. Sludge was applied in trenches, as either 20% or 40% solids. Black locust, hybrid poplar, and willow seedlings were planted over the site to establish near forest-like vegetation. Seven years after establishment, overall survival is about 80%. The entrenched sludge provided increased soil moisture retention, deeper root development, increased nutrient availability and retention, and larger leaf sizes. Sludge applications resulted in greater above-ground …
Aspen Ecology In The United States: Recent Advances And Future Needs, Paul C. Rogers
Aspen Ecology In The United States: Recent Advances And Future Needs, Paul C. Rogers
North American Forest Ecology Workshop
This presentation (along with a similar Canadian perspective) will offer a context for subsequent papers in the Advances in North American Aspen Ecology session. Collectively, we hope to outline major areas of research in North America, especially as they relate to perceived management needs. There is a long and rich history of ecological research in aspen systems of the United States. Probably the most striking long-term change, from a managerial perspective, has been a shift toward biological benefits of aspen as opposed to past avoidance, or even active denudation, of these systems in favor of more commercial species. This talk …
Incorporating Fairness Motives Into The Impulse Balance Equilibrium And Quantal Response Equilibrium Concepts: An Application To 2x2 Games, Alessandro Tavoni
Incorporating Fairness Motives Into The Impulse Balance Equilibrium And Quantal Response Equilibrium Concepts: An Application To 2x2 Games, Alessandro Tavoni
Alessandro Tavoni
Substantial evidence has accumulated in recent empirical works on the limited ability of the Nash equilibrium to rationalize observed behavior in many classes of games played by experimental subjects. This realization has led to several attempts aimed at finding tractable equilibrium concepts which perform better empirically; one such example is the impulse balance equilibrium (Selten, Chmura, 2008), which introduces a psychological reference point to which players compare the available payoff allocations. This paper is concerned with advancing two new, empirically sound, concepts: equity-driven impulse balance equilibrium (EIBE) and equity-driven quantal response equilibrium (EQRE): both introduce a distributive reference point to …
On The Preorganization Of The Active Site Of Choline Oxidase For Hydride Transfer And Tunneling Mechanism, Osbourne Quaye
On The Preorganization Of The Active Site Of Choline Oxidase For Hydride Transfer And Tunneling Mechanism, Osbourne Quaye
Chemistry Dissertations
Choline oxidase catalyzes the two-step oxidation of choline to glycine betaine, one of limited osmoprotectants, with the formation of betaine aldehyde as an enzyme bound intermediate. Glycine betaine accumulates in the cytoplasm of plants and bacteria as a defensive mechanism to withstand hyperosmolarity and elevated temperatures. This makes the genetic engineering of relevant plants which lack the property of salt accumulation of economic interest, and the biosynthetic pathway of the osmolyte a potential drug target in microbial infections. The reaction of alcohol oxidation occurs via a hydride ion tunneling transfer from the substrate donor to a flavin acceptor within a …
Hadronic Parity Violation And Effective Field Theory, Br Holstein
Hadronic Parity Violation And Effective Field Theory, Br Holstein
Barry R Holstein
The history and phenomenology of hadronic parity violation is reviewed and a new modelindependent approach based on effective field theory is developed. Possible future developments are discussed.
Lecture 2, Shuangge Ma
Scholarship In The Digital Age: Blurring The Boundaries Between The Sciences And The Humanities (Keynote), Christine L. Borgman
Scholarship In The Digital Age: Blurring The Boundaries Between The Sciences And The Humanities (Keynote), Christine L. Borgman
Christine L. Borgman
As the digital humanities mature, their scholarship is taking on many characteristics of the sciences, becoming more data-intensive, information-intensive, distributed, multi-disciplinary, and collaborative. While few scholars in the humanities or arts would wish to be characterized as emulating scientists, they do envy the comparatively rich technical and resource infrastructure of the sciences. The interests of all scholars in the university align with respect to access to data, library resources, and computing infrastructure. However, the scholarly interests of the sciences and humanities diverge regarding research practices, sources of evidence, and degrees of control over those sources. This talk will explore the …
How Best Should We Manage Hybrid Poplar Plantations? Interactions Of Site Preparation, Vegetation Control And Fertilization, Simon Bilodeau-Gauthier, David Pare, Christian Messier
How Best Should We Manage Hybrid Poplar Plantations? Interactions Of Site Preparation, Vegetation Control And Fertilization, Simon Bilodeau-Gauthier, David Pare, Christian Messier
North American Forest Ecology Workshop
The silviculture of hybrid poplars is a promising solution to reduce the pressure on natural forests while maintaining the wood supply to industries. However, hybrid poplars are sensitive to competing vegetation and to inadequate soil conditions and fertility. Possible management tools include mechanical site preparation (MSP), vegetation control, and fertilization. We present here the results after five years of growth for eight formerly forested sites (40 hectares total) on Podzols in the province of Quebec, Canada. The experimental design combines four MSP treatments (harrowing, scarifying, mounding, and no preparation) with four frequencies of plant competition control by brushing (from never …
Spatial Patterns In Forest Understories: Relationships To Overstory Thinning Intensity And Understory Plant Diversity, Paul Satterthwaite, Lisa M. Ganio, Klaus J. Puettmann
Spatial Patterns In Forest Understories: Relationships To Overstory Thinning Intensity And Understory Plant Diversity, Paul Satterthwaite, Lisa M. Ganio, Klaus J. Puettmann
North American Forest Ecology Workshop
Amount, spatial distribution, and species composition of understory plant communities have been shown to respond to changes in overstory structure. While response of the amount and composition of understory vegetation to thinning has been investigated in several ecosystems, spatial distributions have received less attention. We investigated spatial statistical techniques to examine associations of patch size of clonal shrubs and annual ruderals as they relate to overstory conditions after thinnings. We assessed the interpretation of empirical semivariograms in describing spatial pattern and whether semivariogram parameters can be useful when comparing impacts of different thinning regimes. We simulated vegetation patterns to test …
Landscape Assessment And Monitoring Of Mountain Pine Beetle Mortality In Greater Yellowstone Ecosystem Whitebark Pine, W.Wallace Macfarlane, B. Gordon, Jesse A. Logan, Louisa Willcox
Landscape Assessment And Monitoring Of Mountain Pine Beetle Mortality In Greater Yellowstone Ecosystem Whitebark Pine, W.Wallace Macfarlane, B. Gordon, Jesse A. Logan, Louisa Willcox
North American Forest Ecology Workshop
Since 2000, USDA Forest Service Aerial Detection Surveys (ADS) and ground-based surveys indicate mountain pine beetle (MPB) outbreaks have caused catastrophic loss of whitebark pine (WBP) in the Greater Yellowstone Ecosystem (GYE). However, the full extent of the damage is unknown because of limitations to the traditional survey methods. We describe a new method aimed at quickly and cost-effectively documenting landscape conditions. The method utilizes low-flying airplane overflights, Global Positioning System (GPS), and Geographic Information System (GIS) technologies along with digital photography to categorize MPB outbreaks based on a new landscape classification scheme. We conducted a pilot study consisting of …
Competitive Effects And Equivalence Of Woody And Herbaceous Vegetation In A Young Boreal Mixedwood Stand, Hongan Yan, Phil G. Comeau, D. G. Pitt
Competitive Effects And Equivalence Of Woody And Herbaceous Vegetation In A Young Boreal Mixedwood Stand, Hongan Yan, Phil G. Comeau, D. G. Pitt
North American Forest Ecology Workshop
Mixedwood stands of white spruce (Picea glauca [Moench] Voss) and trembling aspen (Populus tremuloides Michx.) are the major forest type in the boreal forests of western Canada. They contribute significantly to Canada’s wood supply and play important ecological services. Bluejoint grass (Calamagrostis canadensis (Michx.) Beauv.) is also a prominent component of boreal mixedwood ecosystems and can impede natural regeneration of white spruce and negatively affect the development of white spruce and aspen mixedwood stands. Several studies have shown that spruce growth declines with increasing aspen abundance. Hence, competition control is often required to achieve acceptable survival and growth of spruce. …
Overstory And Understory Vegetation Dynamics In Response To Thinning In Coniferous Stands In Western Oregon, Adrian Ares, Andrew R. Neill, Klaus J. Puttmann
Overstory And Understory Vegetation Dynamics In Response To Thinning In Coniferous Stands In Western Oregon, Adrian Ares, Andrew R. Neill, Klaus J. Puttmann
North American Forest Ecology Workshop
Thinning even-aged coniferous stands in the Pacific Northwest is aimed at accelerating development of late-successional features, while maintaining long-term forest productivity. We examined effects of thinning on overstory and understory vegetation 11 years after harvest in 40- to 60-year old forests dominated by Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) on three sites in western Oregon. Each site contained an unthinned control (238-1446 tpha) and three thinning treatments selected to enhance overstory structural diversity by decreasing densities, and enhance spatial variability within stands (high density = 120 tpha; moderate density = 80 tpha; variable thin with 120, 80 and 40 tpha with …
Whitebark Pine As A Foundation And Keystone Species: Functional Roles And Community Interactions, Diana Tomback
Whitebark Pine As A Foundation And Keystone Species: Functional Roles And Community Interactions, Diana Tomback
North American Forest Ecology Workshop
Whitebark pine (Pinus albicaulis), a non-commercial five-needle white pine (Family Pinaceae, Subgenus Strobus), and the only North American stone pine (Subsection Cembrae), inhabits upper subalpine and treeline zones throughout the western United States and Canada. The most northerly in distribution of western North American white pines, it occurs across 18∞ of latitude and 21∞ of longitude, and comprises diverse community types--successional, climax, and treeline, mesic to xeric, and pure to mixed associations. Studies within the last three decades have elucidated a unique ecology for whitebark pine, derived in part from obligate seed dispersal by Clarkís nutcrackers, but also from its …
Forest Histories & Forest Futures, Cathy Whitlock
Forest Histories & Forest Futures, Cathy Whitlock
North American Forest Ecology Workshop
The climate changes projected for the future will have significant consequences for forest ecosystems and our ability to manage them. It is reasonable to ask: Are there historical precedents that help us understand what might happen in the future or are historical perspectives becoming irrelevant? What synergisms and feedbacks might be expected between rapidly changing climate and land–use in different settings, especially at the wildland–urban interface? What lessons from the past might help us plan for a changing world? Information on forest history comes from a variety of sources, including pollen and charcoal preserved in lake sediments spanning millennia, variations …
Aerogel Waveplates, Pradeep Bhupathi, Jungseek Hwang, Rodica Martin, Jackson Blankstein, Lukas Jaworski, Norbert Mulders, David B. Tanner, Yoonseok Lee
Aerogel Waveplates, Pradeep Bhupathi, Jungseek Hwang, Rodica Martin, Jackson Blankstein, Lukas Jaworski, Norbert Mulders, David B. Tanner, Yoonseok Lee
Department of Physics and Astronomy Faculty Scholarship and Creative Works
Optical transmission measurements were made on 98% porosity silica aerogel samples under various degrees of uniaxial strain. Uniaxially compressed aerogels exhibit large birefringence, proportional to the amount of compression, up to the 15% strain studied. The birefringence is mostly reversible and reproducible through multiple compression-decompression cycles. Our study demonstrates that uniaxially strained high porosity aerogels can be used as tunable waveplates in a broad spectral range.
Flight Experiments On The Effects Of Contamination On Electron Emission Of Materials, John R. Dennison, Joshua L. Hodges, Jeff Duce, Amberly Evans
Flight Experiments On The Effects Of Contamination On Electron Emission Of Materials, John R. Dennison, Joshua L. Hodges, Jeff Duce, Amberly Evans
All Physics Faculty Publications
We report on a study of the effects of prolonged exposure to the space environment and of chargeenhanced contamination on the electron emission and resistivity of spacecraft materials. The State of Utah Space Environment & Contamination Study (SUSpECS) was deployed on the International Space Station (ISS) in March 2008 onboard the MISSE-6 payload during STS-123. The Materials International Space Station Experiment (MISSE-6) program is designed to characterize the performance of candidate new space materials over the course of its ~17 month exposure to the LEO environment, with a target return date of August 2009 on STS-127. Approximately 165 samples are …
Reference: Multiple Imputation, Shuangge Ma
Observational Evidence For Tidal Destruction Of Exoplanets, Brian Jackson, Rory Barnes, Richard Greenberg
Observational Evidence For Tidal Destruction Of Exoplanets, Brian Jackson, Rory Barnes, Richard Greenberg
Brian Jackson
The distribution of the orbits of close-in exoplanets shows evidence for ongoing removal and destruction by tides. Tides raised on a planet's host star cause the planet's orbit to decay, even after the orbital eccentricity has dropped to zero. Comparison of the observed orbital distribution and predictions of tidal theory shows good qualitative agreement, suggesting tidal destruction of close-in exoplanets is common. The process can explain the observed cutoff in small semimajor axis values, the clustering of orbital periods near three days, and the relative youth of transiting planets. Contrary to previous considerations, a mechanism to stop the inward migration …
A Third Giant Planet Orbiting Hip 14810, Jason T. Wright, Debra A. Fischer, Eric B. Ford, Dimitri Veras, Ji Wang, Gregory W. Henry, Geoffrey W. Marcy, Andrew W. Howard, John Asher Johnson
A Third Giant Planet Orbiting Hip 14810, Jason T. Wright, Debra A. Fischer, Eric B. Ford, Dimitri Veras, Ji Wang, Gregory W. Henry, Geoffrey W. Marcy, Andrew W. Howard, John Asher Johnson
Information Systems and Engineering Management Research Publications
We present new precision radial velocities and a three-planet Keplerian orbit fit for the V = 8.5, G5 V star HIP 14810. We began observing this star at Keck Observatory as part of the N2K Planet Search Project. Wright et al. announced the inner two planets to this system, and subsequent observations have revealed the outer planet and the proper orbital solution for the middle planet. The planets have minimum masses of 3.9, 1.3, and 0.6 MJup and orbital periods of 6.67, 147.7, and 952 day, respectively. We have numerically integrated the family of orbital solutions consistent with the data …
Improving The Separability Of A Reservoir Facilitates Learning Transfer, David Norton, Dan A. Ventura
Improving The Separability Of A Reservoir Facilitates Learning Transfer, David Norton, Dan A. Ventura
Faculty Publications
We use a type of reservoir computing called the liquid state machine (LSM) to explore learning transfer. The Liquid State Machine (LSM) is a neural network model that uses a reservoir of recurrent spiking neurons as a filter for a readout function. We develop a method of training the reservoir, or liquid, that is not driven by residual error. Instead, the liquid is evaluated based on its ability to separate different classes of input into different spatial patterns of neural activity. Using this method, we train liquids on two qualitatively different types of artificial problems. Resulting liquids are shown to …
Analytic Description Of The High-Energy Plateau In Harmonic Generation By Atoms: Can The Harmonic Power Increase With Increasing Laser Wavelengths?, M. V. Frolov, N. L. Manakov, T. S. Sarantseva, M. Yu. Emelin, M. Yu. Ryabikin, Anthony F. Starace
Analytic Description Of The High-Energy Plateau In Harmonic Generation By Atoms: Can The Harmonic Power Increase With Increasing Laser Wavelengths?, M. V. Frolov, N. L. Manakov, T. S. Sarantseva, M. Yu. Emelin, M. Yu. Ryabikin, Anthony F. Starace
Anthony F. Starace Publications
A closed-form analytic formula for high-order harmonic generation (HHG) rates for atoms (that generalizes an HHG formula for negative ions [M.V. Frolov et al., J. Phys. B 42, 035601 (2009)]) is used to study laser wavelength scaling of the HHG yield for harmonic energies in the cutoff region of the HHG plateau. We predict increases of the harmonic power for HHG by Ar, Kr, and Xe with increasing wavelength λ over atom-specific intervals of λ in the infrared region, λ ~ (0.8–2.0) μm.
Music Recommendation And Query-By-Content Using Self-Organizing Maps, Kyle B. Dickerson, Dan A. Ventura
Music Recommendation And Query-By-Content Using Self-Organizing Maps, Kyle B. Dickerson, Dan A. Ventura
Faculty Publications
The ever-increasing density of computer storage devices has allowed the average user to store enormous quantities of multimedia content, and a large amount of this content is usually music. Current search techniques for musical content rely on meta-data tags which describe artist, album, year, genre, etc. Query-by-content systems allow users to search based upon the acoustical content of the songs. Recent systems have mainly depended upon textual representations of the queries and targets in order to apply common string-matching algorithms. However, these methods lose much of the information content of the song and limit the ways in which a user …
Formation And Size Tuning Of Colloidal Microcapsules Via Host-Guest Molecular Recognition At The Liquid-Liquid Interface, D Patra, F Ozdemir, Or Miranda, B Samanta, A Sanyal, Vm Rotello
Formation And Size Tuning Of Colloidal Microcapsules Via Host-Guest Molecular Recognition At The Liquid-Liquid Interface, D Patra, F Ozdemir, Or Miranda, B Samanta, A Sanyal, Vm Rotello
Vincent Rotello
Stimuli-responsive colloidal microcapsules have been fabricated at the oil−water interface using molecular recognition between functionalized gold nanoparticles. Water-soluble β-cyclodextrin-capped gold nanoparticles and organo-soluble adamantyl-functionalized gold nanoparticles are self-assembled at the water−toluene interface via specific host−guest molecular interactions to provide robust microcapsules. Multivalent interactions of complementary ligands on the nanoparticle surface provide stability to these capsules. Unlike covalently cross-linked microcapsules, the reversible nature of these bridging interactions can be used to manipulate the size of these capsules via introduction of competing adamantane containing amphiphilic guest molecules. Partial disruption of interfacial cross-linking allows microcapsules to coalesce with each other to form larger …
Rapid Responders To Frovatriptan In Acute Migraine Treatment: Results From A Long-Term, Open-Label Study, Egilius L.H. Spierings, Egilius L.H. Spierings, Charlotte Keywood, Jeffrey Baggish, Harvey J. Blumenthal, Roger K. Cady, David H. Cook, Seymour Diamond, Keith R. Edwards, David L. Friedgood, Ronald C. Gove, Daniel B. Hier, Robert G. Kaniecki, David Kudrow
Rapid Responders To Frovatriptan In Acute Migraine Treatment: Results From A Long-Term, Open-Label Study, Egilius L.H. Spierings, Egilius L.H. Spierings, Charlotte Keywood, Jeffrey Baggish, Harvey J. Blumenthal, Roger K. Cady, David H. Cook, Seymour Diamond, Keith R. Edwards, David L. Friedgood, Ronald C. Gove, Daniel B. Hier, Robert G. Kaniecki, David Kudrow
Chemistry Faculty Research & Creative Works
Background. the Chronic Nature of Migraine and the Reliance on Acute Treatment Constitute the Basis of the Present Long-Term, Open-Label Study. Objectives. First, Assessment of the Tolerability and Safety of Frovatriptan, 2.5-7.5 Mg Taken Orally over 24 Hours, for the Acute Treatment of Migraine, Repeatedly over a 12-Month Period. Second, Assessment of the Efficacy and Tolerability of a Second, Double-Blind Dose of 2.5-Mg Frovatriptan, Compared with Placebo, for Nonresponse at 2 Hours after Treatment of Moderate or Severe Headache with 2.5-Mg Frovatriptan. Results. with Regard to the First Attack Treated, 173 (36%) of the 486 Subjects in the Study Did …
Hydrodynamic Relaxation Of An Electron Plasma To A Near-Maximum Entropy State, D. J. Rodgers, S. Servidio, W. H. Matthaeus, D. C. Montgomery, T. B. Mitchell, T. Aziz
Hydrodynamic Relaxation Of An Electron Plasma To A Near-Maximum Entropy State, D. J. Rodgers, S. Servidio, W. H. Matthaeus, D. C. Montgomery, T. B. Mitchell, T. Aziz
Dartmouth Scholarship
Dynamical relaxation of a pure electron plasma in a Malmberg-Penning trap is studied, comparing experiments, numerical simulations and statistical theories of weakly dissipative two-dimensional (2D) turbulence. Simulations confirm that the dynamics are approximated well by a 2D hydrodynamic model. Statistical analysis favors a theoretical picture of relaxation to a near-maximum entropy state with constrained energy, circulation, and angular momentum. This provides evidence that 2D electron fluid relaxation in a turbulent regime is governed by principles of maximum entropy.
Reference: Weighted Bootstrap, Shuangge Ma