Physical Sciences and Mathematics Commons^™

Modeling Englacial Radar Attenuation At Siple Dome, West Antarctica, Using Ice Chemistry And Temperature Data, Joseph A. Macgregor, Dale P. Winebrenner, Howard Conway, Kenichi Matsuoka, Paul Andrew Mayewski, Gary D. Clow

Earth Science Faculty Scholarship

The radar reflectivity of an ice-sheet bed is a primary measurement for discriminating between thawed and frozen beds. Uncertainty in englacial radar attenuation and its spatial variation introduces corresponding uncertainty in estimates of basal reflectivity. Radar attenuation is proportional to ice conductivity, which depends on the concentrations of acid and sea-salt chloride and the temperature of the ice. We synthesize published conductivity measurements to specify an ice-conductivity model and find that some of the dielectric properties of ice at radar frequencies are not yet well constrained. Using depth profiles of ice-core chemistry and borehole temperature and an average of the …

Reliability Of Krylov Subspace Methods - A Practical Perspective, M. Naumov, M. Manguoglu, C. C. Mikkelsen, A. Arsenieva, Ahmed Sameh

Department of Computer Science Technical Reports

No abstract provided.

Infrastructure Hardening: A Competitive Co-Evolutionary Methodology Inspired By Neo-Darwinian Arms Races, Travis Service, Daniel R. Tauritz, William M. Siever

Computer Science Faculty Research & Creative Works

The world is increasingly dependent on critical infrastructures such as the electric power grid, water, gas, and oil transport systems, which are susceptible to cascading failures that can result from a few faults. Due to the combinatorial complexity in the search spaces involved, most traditional search techniques are inappropriate for identifying these faults and potential protections against them. This paper provides a computational methodology employing competitive coevolution to simultaneously identify low-effort, high-impact faults and corresponding means of hardening infrastructures against them. A power system case study provides empirical evidence that our proposed methodology is capable of identifying cost effective modifications …

Tuning The Ferromagnetism Of One-Dimensional Fe ∕ Pt ∕ Fe Multilayer Barcode Nanowires Via The Barcode Layer Effect, Puspamitra Panigrahi, Ranjit Pati

Department of Physics Publications

Using first-principles density functional theory, we have predicted equilibrium structures and electronic and magnetic properties of one-dimensional ferromagnetic Fe∕Pt∕Fe multilayer barcode nanowires. By increasing the thickness of the Pt layer and consequently reducing the thickness of the Fe layer in the nanowire in the ferromagnetic configuration, we found that the average magnetic moment per iron atom, μ_av, increases monotonically with an ∼1∕N(Fe) dependence, where N(Fe) is the number of Fe layers. The monotonic increase in average magnetic moment is attributed to the change in magnetic moment at the Fe-Pt interface, and a simple model is …

Centre Canadien Cooperatif De La Sante De La Faune: Rapport Annuel 2006-2007

Canadian Cooperative Wildlife Health Centre: Newsletters and Publications

À propos du CCCSF
Nos activités
Surveillance des maladies de la faune
Services d’information
Formation
Points saillants de la réponse aux maladies de la faune et de leur gestion
Publications et rapports: Exemples de publications du personnel du CCCSF
Rapport financier 2006-2007– État des revenus et dépenses
Personnel et associés du CCCSF - 2006-2007
Conseil d’administration du CCCSF - 2006-2007

Exohedral Silicon Fullerenes: SiNPtN/2 (20≤N≤60), Yong Pei, Yi Gao, Xiao Cheng Zeng

Xiao Cheng Zeng Publications

Using density functional theory method we show that hollow silicon fullerene cages, Si_N(20≤N≤60), can be fully stabilized by exohedrally coated platinum atoms (Pt_N/2), denoted as Si_NPt_N/2. The exohedral coating Pt_N/2 passivates the dangling bonds of the silicon cages, thereby making the silicon cages Si_N to retain the symmetry and structure of homologous carbon fullerenes C_N. In particular, the I_h symmetrical, 60-atom silicon buckminsterfullerene cage (Si60) can be fully stabilized by exohedrally coated 30 Pt atoms. Properties of Si_NPt_{N/2 …}

A Censored Multinomial Regression Model For Perinatal Mother To Child Transmission Of Hiv, Charlotte C. Gard, Elizabeth R. Brown

UW Biostatistics Working Paper Series

In studies designed to estimate rates of perinatal mother to child transmission of HIV, HIV assays are scheduled at multiple points in time. Still infection status for some infants at some time points is often unknown, particularly when interim analyses are conducted. Logistic regression and Cox proportional hazards regression are commonly used to estimate covariate-adjusted transmission rates, but their methods for handling missing data may be inadequate. Here, we propose using censored multinomial regression models to estimate cumulative and conditional rates of HIV transmission. Through simulation, we show that the proposed methods perform better than standard logistic models in terms …

Interview With Kathy & Matt Unger, Unger Farms, 2007 (Audio), Kathy Unger, Matt Unger

All Sustainability History Project Oral Histories

Interview of Kathy and Matt Unger by Alix Lefler at Cornelius, Oregon on July 25th, 2007.

The interview index is available for download.

An Example Of How To Write The Statistical Section Of A Bioequivalence Study Protocol For Fda Review, William F. Mccarthy

COBRA Preprint Series

This paper provides a detailed example of how one should write the statistical section of a bioequivalence study protocol for FDA review. Three forms of bioequivalence are covered: average bioequivalence (ABE), population bioequivalence (PBE) and individual bioequivalence (IBE). The method of analysis is based on Jones and Kenward (2003) and a modification of their SAS Macro is provided.

Semantic Web: Promising Technologies And Current Applications In Health Care & Life Sciences, Amit P. Sheth

Kno.e.sis Publications

No abstract provided.

Bedrock Channel Geometry Along An Orographic Rainfall Gradient In The Upper Marsyandi River Valley In Central Nepal, William Craddock, Douglas Burbank, Bodo Bookhagen, Emmanuel Gabet

Faculty Publications

Pronounced rainfall gradients combined with spatially uniform exhumation of rocks at Quaternary timescales and uniform rock strength make the upper Marsyandi River valley in central Nepal a useful natural laboratory in which to explore variations in bedrock channel width. We focus on small catchments (0.6–12.4 km2) along a more than tenfold gradient in monsoon rainfall. Rainfall data are gathered from a dense weather network and calibrated satellite observations, the pattern of Quaternary exhumation is inferred from apatite fission track cooling ages, and rock compressive strength is measured in the field. Bedrock channel widths, surveyed at high scour indicators, scale as …

Relaxin As A Diagnostic Tool For Pregnancy In The Coyote (Canis Latrans), Debra A. Carlson, Eric M. Gese

United States Department of Agriculture Wildlife Services: Staff Publications

The diagnosis of pregnancy in the domestic dog (Canis familiaris) often employs specialized equipment, experienced staff, and the cooperation of the bitch. These procedures can be challenging when the subject is a wild canid, particularly in a field setting. In addition, reproductive hormone assays are unreliable as a diagnostic tool because the estrous profiles of pregnant and pseudopregnant canines are similar. However, research has demonstrated that the hormone relaxin can be detected in maternal blood after embryonic implantation, but remains negligible in non-pregnant females. We investigated the use of relaxin as a diagnostic marker of pregnancy in the …

Bette And Will White Oral History Interview With Spencer Fleury And Todd Chavez, July 25, 2007, Elizabeth L. White (Interviewee), William B. White (Interviewee), Spencer Fleury (Interviewer), Todd Chavez (Interviewer)

Environmental Sustainability Oral Histories

The Drs. White take turns discussing how they became interested in karst science. They reflect on the days when public opinion marginalized karst science and offer what they perceive as the historical factors which have allowed it to become established as a stand-alone scientific discipline. They then discuss students who have worked with them on various karst projects. Dr. Will White tells the story of the haunted telephone from Crystal Cave in Kentucky. The interviewees then discuss the relationship between professional karst scientists and the amateur, recreational caving community. They also discuss the future of karst science specifically with relation …

Polarization Control Of Direct (Non-Sequential) Two-Photon Double Ionization Of He, Evgeny A. Pronin, N. L. Manakov, S. I. Marmo, Anthony F. Starace

Anthony F. Starace Publications

An ab initio parametrization of the doubly-differential cross section (DDCS) for two-photon double ionization (TPDI) from an s² subshell of an atom in a ¹S₀-state is presented. Analysis of the elliptic dichroism (ED) effect in the DDCS for TPDI of He and its comparison with the same effect in the concurrent process of sequential double ionization shows their qualitative and quantitative differences, thus providing a means to control and to distinguish sequential and non-sequential processes by measuring the relative ED parameter.

Empirical Efficiency Maximization, Daniel B. Rubin, Mark J. Van Der Laan

U.C. Berkeley Division of Biostatistics Working Paper Series

It has long been recognized that covariate adjustment can increase precision, even when it is not strictly necessary. The phenomenon is particularly emphasized in clinical trials, whether using continuous, categorical, or censored time-to-event outcomes. Adjustment is often straightforward when a discrete covariate partitions the sample into a handful of strata, but becomes more involved when modern studies collect copious amounts of baseline information on each subject.

The dilemma helped motivate locally efficient estimation for coarsened data structures, as surveyed in the books of van der Laan and Robins (2003) and Tsiatis (2006). Here one fits a relatively small working model …

Managing Business Process Risk Using Rich Organizational Models, Moshiur Bhuiyan, M. M. Zahidul Islam, George Koliadis, Aneesh Krishna, Aditya K. Ghose

Faculty of Informatics - Papers (Archive)

Business processes represent the operational capabilities of an organization. In order to ensure process continuity, the effective management of risk becomes an area of key concern. In this paper we propose an approach for supporting risk identification with the use of higher-level organizational models. We provide some intuitive metrics for extracting measures of actor criticality, and vulnerability from organizational models. This helps direct risk management to areas of critical importance within organization models. Additionally, the information can be used to assess alternative organizational structures in domains where risk mitigation is crucial. At the process level, these measures can be used …

Integration Of Agent-Oriented Conceptual Models And Uml Activity Diagrams Using Effect Annotations, Moshiur Bhuiyan, M. M. Islam, Aneesh Krishna, Aditya K. Ghose

Faculty of Informatics - Papers (Archive)

Agent–oriented conceptual modeling notations such as i* represents an interesting approach for modeling early phase requirements which includes organizational contexts, stakeholder intentions and rationale. On the other hand, Unified Modeling Language (UML) is suitable for later phases of requirement capture which usually focus on completeness, consistency, and automated verification of functional requirements for the new system. In this paper, we propose a methodology to facilitate and support the combined use of notation for modeling requirement engineering process in a synergistic fashion. For organizational modeling/early phase requirements capturing we use the i* modeling framework that describes the organizational relationships among various …

Gis Analysis Of Lightning Strikes Within A Tornadic Environment, Richard Snow, Mary Snow, Nicole Kufa

Publications

Recent research suggests that a maximum rate of lightning strikes occurs at least 15 to 20 minutes prior to tornado formation within a supercell storm. These maxima are associated with strengthening updrafts as they appear in radar measurements. An increase in lightning rates correlates with an increase of shear in the lower part of the storm. In combination with a strong updraft or downdraft, this shear can provide the ingredients for rotation and possibly a tornado. Polarity reversal of lightning around the time of tornado touchdown also has been examined. Thus, increasing lightning flash rates and reversal of lightning strike …

Sheep Updates 2007 - Part 1, Richard Gunner, Anthony Clarke, Kevin Bell, Hugh Dove, H. M. Burrow, Kevin Goss

Sheep Updates

This session covers six papers from different authors:

PLENARY

1. Life beyond the farmgate - the meat perspective, Richard Gunner – Principal:- Richard Gunner’s Fine Meats

2. Do you need to worry about climate change?, Anthony Clark, Centre for Resource and Environmental Studies, Australian National University and Bureau of Rural Sciences.

3. Ruminant nutrition panel session - The impact of nutrition on animal health and welfare, Kevin Bell, School of Veterinary and Biomedical Studies, Murdoch University

4. Ruminant nutrition panel session - Pasture/animal interactions, Hugh Dove, Chief Research Scientist, CSIRO Plant Industry

5. Precision Cattle Breeding for …

Sheep Updates 2007 - Part 3, Andrew Ritchie, Edward Riggall, James Hall, Gus Rose, Johan Greeff, John Young, M. Alchin, M. Young, T. Johnson, John Lucy, Martin Staines, Tim Wiley, Rob Grima, Sandra Prosser, Matt Ryan, Geoff Moore, Tony Albertsen, Phil Barrett-Lennard, George Woolston, John Titerington, Sarah Knight, Brianna Peake

Sheep Updates

This session covers seven papers from different authors:

PROFITABILITY

1. Benchmarking demonstrates both the potential and realised productivity gains in the sheep and wool industry, Andrew Ritchie, Edward Riggall and James Hall, ICON Agriculture, Darkan

2. Improving sheep genetics will increase farm profitability, Gus Rose, Johan Greeff Department of Agriculture and Food Western Australia, John Young Farming Systems Analysis Service, WA

3. Meat, Merinos and making money in WA Pastoral Zone, M. Alchin, M. Young and T. Johnson, Department of Agriculture and Food Western Australia,

GRAZING

4. Nitrogen - farmers' friend or foe? John Lucy and Martin Staines, Department …

Sheep Updates 2007 - Part 4, Dean Thomas, Dominique Blache, Dean Revell, Hayley Norman, Phil Vercoe, Zoey Durmic, Serina Digby, Di Mayberry, Megan Chadwick, Martin Sillence, David Masters, R. Silberstein, F. Byrne, P. G. H. Nichols, J. Young, L. Aitkins, M. G. Wilmot, A. J. Rintoul, T. Lambert, D. R. Mcclements, P. Raper, P. Ward, C. Walton, T. York, David Pethick, David Hopkins, Malcolm Mcphee, D. B. Savage, J. V. Nolan, I. R. Godwin, A. Aoetpah, T. Nguyen, N. Baillie, C. Lawler, Ken Geenty, John Smith, Darryl Smith, Tim Dyall, Grant Uphill, John Young, Michael Paton, John Dorrian

Sheep Updates

This session covers eight papers from different authors:

GRAZING

1. The impact of high dietary salt and its implications for the management of livestock grazing saline land, Dean Thomas, Dominique Blache, Dean Revell, Hayley Norman, Phil Vercoe, Zoey Durmic, Serina Digby, Di Mayberry, Megan Chadwick, Martin Sillence and David Masters, CRC for Plant-based Management of Dryland Salinity, Faculty of Natural & Agricultural Sciences, The University of Western Australia, WA.

2. Sustainable Grazing on Saline Lands - outcomes from the WA1 research project, H.C. Norman^1,2, D.G. Masters^1,2, R. Silberstein^1,2, F. Byrne^2,3, P.G.H. Nichols …

A High-Resolution Ultraviolet Absorption Spectrum Of Supernova Ejecta In Sn1006, Andrew J. S. Hamilton, Robert A. Fesen, William P. Blair

Dartmouth Scholarship

We report a high-resolution, far-ultraviolet, Space Telescope Imaging Spectrograph (STIS) E140M spectrum of the strong, broad Siii, iii and iv features produced by the ejecta of the supernova of 1006 ad (SN1006) seen in absorption against the background Schweizer–Middleditch OB subdwarf star. The spectrum confirms the extreme sharpness of the red edge of the redshifted Si ii 1260 Å feature, supporting the idea that this edge represents the location of the reverse shock moving into the freely expanding Si-rich ejecta. The expansion velocity of ejecta at the reverse shock is measured to be 7026 ± 3(relative) ±10(absolute) km s^{−1 …}

Variable Selection For Nonparametric Varying-Coefficient Models For Analysis Of Repeated Measurements, Lifeng Wang, Hongzhe Li

UPenn Biostatistics Working Papers

Nonparametric varying-coefficient models are commonly used for analysis of data measured repeatedly over time, including longitudinal and functional responses data. While many procedures have been developed for estimating the varying-coefficients, the problem of variable selection for such models has not been addressed. In this article, we present a regularized estimation procedure for variable selection for such nonparametric varying-coefficient models using basis function approximations and a group smoothly clipped absolute deviation penalty (gSCAD). This gSCAD procedure simultaneously selects significant variables with time-varying effects and estimates unknown smooth functions using basis function approximations. With appropriate selection of the tuning parameters, we have …

Secure Cryptographic Precomputation With Insecure Memory, Patrick P. Tsang, Sean W. Smith

Computer Science Technical Reports

Precomputation dramatically reduces the execution latency of many cryptographic algorithms. To sustain the reduced latency over time during which these algorithms are routinely invoked, however, a pool of precomputation results must be stored and be readily available. While precomputation is an old and well-known technique, how to securely and yet efficiently store these precomputation results has largely been ignored. For instance, requiring tamper-proof memory would be too expensive, if not unrealistic, for precomputation to be cost-effective. In this paper, we propose an architecture that provides secure storage for cryptographic precomputation using only insecure memory, which may be eavesdropped or even …

Qos-Aware Service Selection In P2p-Based Business Process Frameworks, S. Yuan, J. Shen

Faculty of Informatics - Papers (Archive)

With the advances and evolution of semantic Web services, service providers need to be more competitive, efficient, flexible, and integrated in the service network at different scenarios, including static and dynamic deployments and interactions. Recently, OWL-S and QoS-aware services have been distinguished due to their significance and their impact on decentralised network. JXTA and BPEL allow peers to cooperate and automate business processes and reengineer their structure, so as to rationally select and make use of all resource in decentralised environment; in addition, they increase efficiency and reduce costs. We incorporated several typical constraints to testify the possibility of the …

Towards More Flexible Internal Workflow Change: Weakly Equivalence Concept For Inter-Organizational Workflow Design, G. Liang, Sim Kim Lau

Faculty of Informatics - Papers (Archive)

Business process management system such as workflow management system has attracted increasing research attentions in e-commerce, especially from an inter-organizational workflow perspective. When designing inter-organizational workflow, it is important to consider soundness of the workflow, which identifies whether a workflow terminates properly. The principle of local criteria ensuring global soundness can be applied to allow the soundness of the entire inter-organizational workflow to be achieved without knowing the detail workflow of every participating organization. However, this principle sometime can become too restrictive when we attempt to ensure the overall workflow is sound while changes are made to the workflow. It …

Experimental Comparison Of Peer-To-Peer Streaming Overlays: An Application Perspective, Jeff Seibert, Davied Zae, Sonia Fahmy, Cristina Nita-Rotaru

Department of Computer Science Technical Reports

No abstract provided.

Greedy Signal Recovery And Uncertainty Principles, Deanna Needell, Roman Vershynin

CMC Faculty Publications and Research

This paper seeks to bridge the two major algorithmic approaches to sparse signal recovery from an incomplete set of linear measurements – L1-minimization methods and iterative methods (Matching Pursuits). We find a simple regularized version of the Orthogonal Matching Pursuit (ROMP) which has advantages of both approaches: the speed and transparency of OMP and the strong uniform guarantees of the L1-minimization. Our algorithm ROMP reconstructs a sparse signal in a number of iterations linear in the sparsity, and the reconstruction is exact provided the linear measurements satisfy the Uniform Uncertainty Principle. In the case of inaccurate measurements and approximately sparse …

Jeanne Gurnee Oral History Interview With Beth Fratesi And Todd Chavez, July 23, 2007, Jeanne Gurnee (Interviewee), Sarah Elizabeth (Beth) Fratesi (Interviewer), Todd Chavez (Interviewer)

Environmental Sustainability Oral Histories

Jeanne Gurnee, speleologist, explorer, writer, editor, conservationist, and land-use planner, discusses how she developed her lifelong interest in caving, how she met her husband Russell, and how they began their involvement with the National Speleological Society (NSS) as a professional pair. She gives an in-depth, chronological discussion of her professional involvement with caving groups and organizations, specifically the founding of fifty or more grottos, as well as her cave projects in Puerto Rico, Barbados, and Angola. Jeanne Gurnee speaks of her love of "show caves", their importance, her reception as an ecological lecturer, and her advice to young women beginning …

William Halliday Oral History Interview With Spencer Fleury And Todd Chavez, July 23, 2007, William Halliday (Interviewee), Spencer Fleury (Interviewer), Todd Chavez (Interviewer)

Environmental Sustainability Oral Histories

Dr. William Halliday, medical surgeon and karst terrain authority, relates segments of his life story back to the development of his interest in karst and caving. Dr. Halliday recounts his involvement as a charter member of the National Speleological Society (NSS), founding several grottos, and the political activism in which he participated on their behalf. He describes a few of his international caving adventures, the difference between karst and pseudo-karst, and his impressions on whether there exists an attitudinal divide between geologists and amateur sport cavers. The interview ends with Dr. Halliday's personal belief that Mars exploration should be pivotal …