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Articles 961 - 990 of 5573
Full-Text Articles in Physical Sciences and Mathematics
Geologic Map Of The Golden Throne Quadrangle, Wayne And Garfield Counties, Utah, Daniel H. Martin
Geologic Map Of The Golden Throne Quadrangle, Wayne And Garfield Counties, Utah, Daniel H. Martin
Theses and Dissertations
The Golden Throne Quadrangle is located within Capitol Reef National Park, south-central Utah. Geologic mapping of this 1:24,000 scale 7.5 minute quadrangle began in 2003 as the National Parks Service desired to have geologic maps at this scale produced within the park. Stratigraphically, ten bedrock formations and ten Quaternary deposits are exposed within the Golden Throne Quadrangle. Geologic formations range in age from Permian to Jurassic. This map contains details not included on previous geologic maps including; the members of the Carmel, Chinle, and Moenkopi Formations. Additionally, the Page Sandstone is herein mapped as an independent unit. Structurally the Golden …
Structure Elucidation Of Bioactive Compounds Isolated From Endophytes Of Alstonia Scholaris And Acmena Graveolens, Nicholas James Hundley
Structure Elucidation Of Bioactive Compounds Isolated From Endophytes Of Alstonia Scholaris And Acmena Graveolens, Nicholas James Hundley
Theses and Dissertations
Alstonia scholaris is an evergreen tree native to Southeast Asia and Australia. It is commonly used as a medicinal plant throughout these regions. In the present study, an endophyte of the genus Xylaria was isolated from a stem of Alstonia scholaris, its mycelia and exudate extracted, and the extract assayed for growth inhibition of HeLa cancer cells in vitro. Several known compounds were isolated and identified based on NMR, infrared, and mass spectral data. The compounds identified are 19,20-epoxycytochalasin C; 19,20epoxycytochalasin D; and xylobovide. Two other compounds, fusaric acid and dehydrofusaric acid, were discovered in an endophyte of the Hypocreales …
An Acyl Radical Cascade Model For The Total Synthesis Of Lyconadin A, Seth W. Grant
An Acyl Radical Cascade Model For The Total Synthesis Of Lyconadin A, Seth W. Grant
Theses and Dissertations
Lyconadin A (1) is a structurally unique Lycopodium alkaloid with antitumor properties, isolated from the club moss Lycopodium complanatum. We are developing a synthetic route to 1 based on a novel 7-exo-trig/6-exo-trig acyl radical cascade cyclization. The synthesis of model acyl radical cascade precursor 23 will be presented. Key features of this synthesis include the suppression of competing elimination during the alkylation of a hindered phenethyl bromide and the use of a lactone as a precursor to a compound bearing two differentially protected primary alcohols. An account of our studies on the model acyl radical cascade cyclization (23 to 24 …
Discover Mojave Outdoor World ~ Forever Earth, Public Lands Institute
Discover Mojave Outdoor World ~ Forever Earth, Public Lands Institute
Presentations (DM)
Program goals:
- Introduce economically disadvantaged urban youth, ages 8-12, to outdoor recreation and education
- Foster a belief that outdoor recreation plays an important and positive role in the health and fitness of America’s youth
Test-Driven Development:Concepts, Taxonomy,And Future Direction, David S. Janzen, Hossein Saiedian
Test-Driven Development:Concepts, Taxonomy,And Future Direction, David S. Janzen, Hossein Saiedian
Computer Science and Software Engineering
Test-driven development creates software in very short iterations with minimal upfront design. Poised for widespread adoption, TDD has become the focus of an increasing number of researchers and developers.
Tracing Requirements To Defect Reports: An Application Of Information Retrieval Techniques, Suresh Yadla, Jane Huffman Hayes, Alex Dekhtyar
Tracing Requirements To Defect Reports: An Application Of Information Retrieval Techniques, Suresh Yadla, Jane Huffman Hayes, Alex Dekhtyar
Computer Science and Software Engineering
To support debugging, maintenance, verification and validation (V&V) and/or independent V&V (IV&V), it is necessary to understand the relationship between defect reports and their related artifacts. For example, one cannot correct a code-related defect report without being able to find the code that is affected. Information retrieval (IR) techniques have been used effectively to trace textual artifacts to each other. This has generally been applied to the problem of dynamically generating a trace between artifacts in the software document hierarchy after the fact (after development has proceeded to at least the next lifecycle phase). The same techniques can also be …
Revisiting The Semantics Of Interval Probabilistic Logic Programs, Alex Dekhtyar, Michael I. Dekhtyar
Revisiting The Semantics Of Interval Probabilistic Logic Programs, Alex Dekhtyar, Michael I. Dekhtyar
Computer Science and Software Engineering
Two approaches to logic programming with probabilities emerged over time: bayesian reasoning and probabilistic satisfiability (PSAT). The attractiveness of the former is in tying the logic programming research to the body of work on Bayes networks. The second approach ties computationally reasoning about probabilities with linear programming, and allows for natural expression of imprecision in probabilities via the use of intervals.
In this paper we construct precise semantics for one PSAT-based formalism for reasoning with inteval probabilities, probabilistic logic programs (p-programs), orignally considered by Ng and Subrahmanian. We show that the probability ranges of atoms and formulas in p-programs cannot …
Forms Of Expression For Designing Visual Languages For Animation, Richard Christopher Davis, James A. Landay
Forms Of Expression For Designing Visual Languages For Animation, Richard Christopher Davis, James A. Landay
Research Collection School of Computing and Information Systems
We present further steps in our research into visual languages for animation. Animation is a rich mode of communication that is currently accessible to few, because animation systems are complex. Some systems try to make animation simple but put severe limits on users’ creative expression. Our field studies are demonstrating that would-be animators need to express animation in a wide variety of ways. We are developing a taxonomy of forms of expression for animation that will help the designers of visual languages for animation to determine which expressive forms to support. Our end goal is to build animation sketching systems …
Final Report: Evaluation Of The Morphoedaphic Index And Sediment Diatoms For Inference Of Pre-European Settlement Total Phosphorus Concentration In Epa Region 10 Lakes, Rich Miller, Aaron Hook, Richard Petersen, Mark D. Sytsma
Final Report: Evaluation Of The Morphoedaphic Index And Sediment Diatoms For Inference Of Pre-European Settlement Total Phosphorus Concentration In Epa Region 10 Lakes, Rich Miller, Aaron Hook, Richard Petersen, Mark D. Sytsma
Center for Lakes and Reservoirs Publications and Presentations
Water quality in many Northwest lakes has declined over the past century due, in part, to increased anthropogenic nutrient loading (Edmonson and Lehman, 1981). Under the Clean Water Act, resource managers such as the Washington Department of Ecology, Oregon Department of Environmental Quality, and tribes are responsible for restoring and protecting the integrity of these waters. Targets for restoration or criteria for impairment are not well defined, however, and may naturally vary by geology, hydrology, morphometry, and climate.
One way to determine whether lakes are impaired and to identify restoration targets is to assess lake reference conditions (EPA 2000). Reference …
Discrete Approximations Of Differential Inclusions In Infinite-Dimensional Spaces, Boris S. Mordukhovich
Discrete Approximations Of Differential Inclusions In Infinite-Dimensional Spaces, Boris S. Mordukhovich
Mathematics Research Reports
In this paper we study discrete approximations of continuous-time evolution systems governed by differential inclusions with nonconvex compact values in infinite-dimensional spaces. Our crucial result ensures the possibility of a strong Sobolev space approximation of every feasible solution to the continuous-time inclusion by its discrete-time counterparts extended as Euler's "broken lines." This result allows us to establish the value and strong solution convergences of discrete approximations of the Bolza problem for constrained infinite-dimensional differential/evolution inclusions under natural assumptions on the initial data.
Presidential Report To The Congress: Net Benefit Analysis Of Us/Soviet Arms Control, David W. Hafemeister
Presidential Report To The Congress: Net Benefit Analysis Of Us/Soviet Arms Control, David W. Hafemeister
Physics
A net assessment of the benefits/losses of arms control treaties in terms of military significance was required in response to the START Resolution of Ratification. The response by the Executive Branch belabored smaller issues, avoided accomplishments and didn't carry out the net assessment.
Proposals For Community Discussion : A Quality Future For The Recreational Marron Fishery : A Five-Year Draft Strategy To Ensure The Long-Term Sustainability Of The Marron Fishery, Recreational Freshwater Fisheries Stakeholder Sub-Committee
Proposals For Community Discussion : A Quality Future For The Recreational Marron Fishery : A Five-Year Draft Strategy To Ensure The Long-Term Sustainability Of The Marron Fishery, Recreational Freshwater Fisheries Stakeholder Sub-Committee
Fisheries management papers
While some of the factors threatening the future of the marron fishery can be managed via traditional fisheries controls, many fall outside of the Department of Fisheries’ jurisdiction and require a ‘whole of Government’ approach to management. To help ensure a quality future for the recreational marron fishery, the Recreational Freshwater Fisheries Stakeholder Sub-committee (RFFSS) has now developed a set of draft management proposals designed to form the basis of a five-year management plan for the fishery.
Integrated Fisheries Management Report Abalone Resource., Department Of Fisheries
Integrated Fisheries Management Report Abalone Resource., Department Of Fisheries
Fisheries management papers
This report includes information on sustainability and sustainable harvest levels for Western Australian abalone stocks as required under the IFM policy. It also contains additional information on the current state of knowledge of the abalone resource, which provides a broader context for considering allocations. In particular, detailed information is provided on the Roe’s abalone resource in the Perth metropolitan area (commercial Area 7/recreational West Coast Zone).
Rose Productivity And Physiological Responses To Different Substrates For Soil-Less Culture, C. Samartzidis, Tala Awada, E. Maloupa, K. Radoglou, H.-I. A. Constantinidou
Rose Productivity And Physiological Responses To Different Substrates For Soil-Less Culture, C. Samartzidis, Tala Awada, E. Maloupa, K. Radoglou, H.-I. A. Constantinidou
School of Natural Resources: Faculty Publications
Cultivation of roses in various soil-less media was studied with the aim to identify the optimum soil condition for rose production. Madelon roses grafted on rootstock of Rosa indica var. major were transplanted to polyethylene bags containing zeolite and perlite (at ratios of 25z:75p, 50z:50p, 75z:25p and 100z:0p, v/v) in a climate-controlled greenhouse. Net photosynthesis (Anet), stomatal conductance (gs) and water use efficiency (WUE) of roses were followed for 5 months. Flower production and quality were recorded in three flowering flushes during a 5-month period. Analysis of variance of repeated measurements showed that even …
Divergence, Recombination And Retention Of Functionality During Protein Evolution, Yanong O. Xu, Randall W. Hall, Richard A. Goldstein, David D. Pollock
Divergence, Recombination And Retention Of Functionality During Protein Evolution, Yanong O. Xu, Randall W. Hall, Richard A. Goldstein, David D. Pollock
Collected Faculty and Staff Scholarship
We have only a vague idea of precisely how protein sequences evolve in the context of protein structure and function. This is primarily because structural and functional contexts are not easily predictable from the primary sequence, and evaluating patterns of evolution at individual residue positions is also difficult. As a result of increasing biodiversity in genomics studies, progress is being made in detecting context-dependent variation in substitution processes, but it remains unclear exactly what context-dependent patterns we should be looking for. To address this, we have been simulating protein evolution in the context of structure and function using lattice models …
The Probe, Issue 240 – September/October 2005
The Probe, Issue 240 – September/October 2005
The Probe: Newsletter of the National Animal Damage Control Association
The Times, They Are A-Changing: A Rebuttal to Dexter Oliver -- Nicole Frey, Treasurer, NADCA
From the President -- Art Smith, President, NADCA
The Probe Archives
Call for Nominations
In Memoriam: Gary Oldenburg
Multiscale Life-Cycle Assessment, T. E. Graedel, T. Lanzano, W. Pott, R. J. Araujo
Multiscale Life-Cycle Assessment, T. E. Graedel, T. Lanzano, W. Pott, R. J. Araujo
Yale School of the Environment Publications Series
No abstract provided.
Can The Anchor Hold? Rethinking The United Nations Environment Programme For The 21st Century, Maria Ivanova
Can The Anchor Hold? Rethinking The United Nations Environment Programme For The 21st Century, Maria Ivanova
Yale School of the Environment Publications Series
No abstract provided.
Regional-Scale Mid-Jurassic To Late Cretaceous Unroofing From The Adirondack Mountains Through Central New England Based On Apatite Fission-Track And (U-Th)/He Thermochronology, Mary K. Roden-Tice, Steven J. Tice
Regional-Scale Mid-Jurassic To Late Cretaceous Unroofing From The Adirondack Mountains Through Central New England Based On Apatite Fission-Track And (U-Th)/He Thermochronology, Mary K. Roden-Tice, Steven J. Tice
Mary K. Roden-Tice
Apatite fission-track (AFT) ages of 178 to 70 Ma for 108 samples from the Adirondack Mountains and eastern New York State, Vermont, western Massachusetts and Connecticut, and western New Hampshire indicate that widespread unroofing occurred throughout the region during the Middle Jurassic to Late Cretaceous. Additionally, (U-Th)/He ages of 167 to 85 Ma were determined on nine of those samples and support cooling rates of 1.8°-2.2°C/m.yr. from 100° to 65°C during the Middle Jurassic to Late Cretaceous. Assuming a geothermal gradient of 25°C/km, unroofing rates for the region were estimated to be, on average, ∼0.07-0.08 km/m.yr. The AFT age discontinuities …
Usability Over Time, Valerie Mendoza, David G. Novick
Usability Over Time, Valerie Mendoza, David G. Novick
David G. Novick
Testing of usability could perhaps be more accurately described as testing of learnability. We know more about the problems of novice users than we know of the problems of experienced users. To understand how these problems differ, and to understand how usability problems change as users change from novice to experienced, we conducted a longitudinal study of usability among middle-school teachers creating Web sites. The study looked at the use both the use of documentation and the underlying software, tracking the causes and extent of user frustration over eight weeks. We validated a categorization scheme for frustration episodes. We found …
Mixture Cure Survival Models With Dependent Censoring, Yi Li, Ram C. Tiwari, Subharup Guha
Mixture Cure Survival Models With Dependent Censoring, Yi Li, Ram C. Tiwari, Subharup Guha
Harvard University Biostatistics Working Paper Series
A number of authors have studies the mixture survival model to analyze survival data with nonnegligible cure fractions. A key assumption made by these authors is the independence between the survival time and the censoring time. To our knowledge, no one has studies the mixture cure model in the presence of dependent censoring. To account for such dependence, we propose a more general cure model which allows for dependent censoring. In particular, we derive the cure models from the perspective of competing risks and model the dependence between the censoring time and the survival time using a class of Archimedean …
Semiparametric Normal Transformation Models For Spatially Correlated Survival Data, Yi Li, Xihong Lin
Semiparametric Normal Transformation Models For Spatially Correlated Survival Data, Yi Li, Xihong Lin
Harvard University Biostatistics Working Paper Series
There is an emerging interest in modeling spatially correlated survival data in biomedical and epidemiological studies. In this paper, we propose a new class of semiparametric normal transformation models for right censored spatially correlated survival data. This class of models assumes that survival outcomes marginally follow a Cox proportional hazard model with unspecified baseline hazard, and their joint distribution is obtained by transforming survival outcomes to normal random variables, whose joint distribution is assumed to be multivariate normal with a spatial correlation structure. A key feature of the class of semiparametric normal transformation models is that it provides a rich …
Inference On Survival Data With Covariate Measurement Error - An Imputation-Based Approach, Yi Li, Louise Ryan
Inference On Survival Data With Covariate Measurement Error - An Imputation-Based Approach, Yi Li, Louise Ryan
Harvard University Biostatistics Working Paper Series
We propose a new method for fitting proportional hazards models with error-prone covariates. Regression coefficients are estimated by solving an estimating equation that is the average of the partial likelihood scores based on imputed true covariates. For the purpose of imputation, a linear spline model is assumed on the baseline hazard. We discuss consistency and asymptotic normality of the resulting estimators, and propose a stochastic approximation scheme to obtain the estimates. The algorithm is easy to implement, and reduces to the ordinary Cox partial likelihood approach when the measurement error has a degenerative distribution. Simulations indicate high efficiency and robustness. …
The Optimal Discovery Procedure For Large-Scale Significance Testing, With Applications To Comparative Microarray Experiments, John D. Storey, James Y. Dai, Jeffrey T. Leek
The Optimal Discovery Procedure For Large-Scale Significance Testing, With Applications To Comparative Microarray Experiments, John D. Storey, James Y. Dai, Jeffrey T. Leek
UW Biostatistics Working Paper Series
As much of the focus of genetics and molecular biology has shifted toward the systems level, it has become increasingly important to accurately extract biologically relevant signal from thousands of related measurements. The common property among these high-dimensional biological studies is that the measured features have a rich and largely unknown underlying structure. One example of much recent interest is identifying differentially expressed genes in comparative microarray experiments. We propose a new approach aimed at optimally performing many hypothesis tests in a high-dimensional study. This approach estimates the Optimal Discovery Procedure (ODP), which has recently been introduced and theoretically shown …
Phase Error Compensation For A 3-D Shape Measurement System Based On The Phase-Shifting Method, Song Zhang, Peisen S. Huang
Phase Error Compensation For A 3-D Shape Measurement System Based On The Phase-Shifting Method, Song Zhang, Peisen S. Huang
Song Zhang
This paper describes a novel phase error compensation method for reducing the measurement error caused by non-sinusoidal waveforms in the phase-shifting method. For 3D shape measurement systems using commercial video projectors, the non-sinusoidal nature of the projected fringe patterns as a result of the nonlinear gamma curve of the projectors causes significant phase measurement error and therefore shape measurement error. The proposed phase error compensation method is based on our finding that the phase error due to the non-sinusoidal waveform of the fringe patterns depends only on the nonlinearity of the projector's gamma curve. Therefore, if the projector's gamma curve …
Prepare Your Mind For Learning, Deborah K. Smith, Trevor T. Moores, Jerry Cha-Jan Chang
Prepare Your Mind For Learning, Deborah K. Smith, Trevor T. Moores, Jerry Cha-Jan Chang
Management, Entrepreneurship and Technology Faculty Publications
The learning process must evolve and expand throughout one's IT career. Most would agree that's often easier said than done. Here are some ways professionals can overcome mental blocks that may prevent learning.
A New Pathway For Communicating The 11-Year Solar Cycle Signal To The Qbo, Eugene C. Cordero, Terrence R. Nathan
A New Pathway For Communicating The 11-Year Solar Cycle Signal To The Qbo, Eugene C. Cordero, Terrence R. Nathan
Faculty Publications, Meteorology and Climate Science
[1] The response of the equatorial quasi-biennial oscillation (QBO) to zonal-mean ozone perturbations consistent with the 11-year solar cycle is examined using a 2 1/2 dimensional model of the tropical stratosphere. Unique to this model are wave-ozone feedbacks, which provide a new, nonlinear pathway for communicating solar variability effects to the QBO. Model simulations show that for zonal-mean ozone perturbations representative of solar maximum (minimum), the diabatic heating due to the wave-ozone feedbacks is primarily responsible for driving a slightly stronger (weaker) QBO circulation and producing a slightly shorter (longer) QBO period. These results, which are explained via an analytical …
Branecode: A Program For Simulations Of Braneworld Dynamics, Martin Johannes, Gary Felder, Andrei V. Frolov, Lev Kofman, Marco Peloso
Branecode: A Program For Simulations Of Braneworld Dynamics, Martin Johannes, Gary Felder, Andrei V. Frolov, Lev Kofman, Marco Peloso
Physics: Faculty Publications
We describe an algorithm and a C++ implementation that we have written and made available for calculating the fully nonlinear evolution of 5D braneworld models with scalar fields. Bulk fields allow for the stabilization of the extra dimension. However, they complicate the dynamics of the system, so that analytic calculations (performed within an effective 4D theory) are usually only reliable for static bulk configurations or when the evolution of the extra dimension is negligible. In the general case, the nonlinear 5D dynamics can be studied numerically, and the algorithm and code we describe are the first ones of that type …
A Five Year Management Strategy For Recreational Fishing On The South Coast. The Minister For Fisheries' Decision In Response To The Final Report Of The South Coast Recreational Fishing Working Group., Jon Ford (Minister For Fisheries; The Kimberley, Pilbara And Gascoyne)
A Five Year Management Strategy For Recreational Fishing On The South Coast. The Minister For Fisheries' Decision In Response To The Final Report Of The South Coast Recreational Fishing Working Group., Jon Ford (Minister For Fisheries; The Kimberley, Pilbara And Gascoyne)
Fisheries management papers
After careful consideration of the South Coast Recreational Fishing Working Group’s recommendations and the wide range of issues raised in submissions, I have made my decisions in respect to the future management arrangements for recreational fishing in South Coast Region. I believe the new management arrangements which will be implemented in 1 January 2006 will go a long way to protecting recreational fishing quality and meeting the long term needs for the sustainable management of recreational fishing. I did note that some of the most pressing concerns raised during public meetings, and in submissions, related to the interaction between the …
The Power And Influence In Some Youden Squares And Secret Sharing, L. Fitina, Ken Russell, Jennifer Seberry
The Power And Influence In Some Youden Squares And Secret Sharing, L. Fitina, Ken Russell, Jennifer Seberry
Faculty of Informatics - Papers (Archive)
We investigate subsets of critical sets of some Youden squares in the context of secret sharing schemes. A subset C of a Youden square is called a critical set, if C can be uniquely completed to a Youden square but any subset of C cannot does not have a unique completion to a Youden square. That part of a Youden square Y which is inaccessible to subsets of a critical set C of Y, called the strongbox of C, may be thought to contain secret information. We study the size of the secret. Seberry and Street have shown how strongboxes …