Physical Sciences and Mathematics Commons^™

Development And Validation Of An Outdoor Leader Experience Use History Instrument, Shayne Galloway

Research in Outdoor Education

This abstract describes the con­ceptualization, development, and validation of an instrument designed to measure the personal and professional experience levels of outdoor leaders - ­the Outdoor Leader Experience Use History (OLEUH). The OLEUH represents one method to generate empirical measurement in what has his­torically been an intuitive arena.

The Awareness Activation Model For Transfer Of Learning In Experiential Settings, Ron Ramsing, Karen P. Hurtes

Research in Outdoor Education

An individual applying her or his newfound knowledge and transferring the information, through action to a new setting is a valued out­come for experiential education practitioners. At the most basic level, the notion of transfer of knowledge appears so simple and commonsensical that it may only subconsciously serve as the focal point of initiative/rope course activities. Yet, transfer facilitated with intention may very well make any new knowledge acquired through experience more efficacious, applicable, and enduring for an individual. Intentional facµitation, including isomorphic framing, may be the "trigger" that activates one's sense of mindfulness toward long-term use or even a …

Youth Development Outcomes Of Adventure Program Perceptions, Marge Scanlin

Research in Outdoor Education

The research will encompass 100 camps randomly selected from various strata of ACA's accredited camps. A total of at least 5000 campers will complete three sets of surveys in 2002/03. Several youth develop­ment outcomes will be measured through pre-; post-, and follow-up surveys of camp­ers and their parents, staff observational checklists, and focus groups with a sample of participating camps. The outcomes under study include increased positive identity ; improved social skills; increased positive values; and learning new skills including cognitive, and psycho-motor skills.

A Multivariate Model Of Adventure Program Perceptions, Jim Sibthorp, Eddie Hill

Research in Outdoor Education

Continued interest in ·program evaluation· and improvement has led to calls for additional multivariate research, better measurement tools, and more complex research designs (Roberts & Yerkes, 2000; Ewert & Sibthorp, 2000). Through multivariate studies, researchers and practitioners can better discern which components of adventure programs have the greatest explanatory power regarding program outcomes, and which variables interact to facilitate or im­pede the learning of programmatic objectives. Recently, new instrumentation has been de­veloped to better address the needs of adventure education research and evaluation. The Life Effectiveness Questionnaire (LEQ) was de­signed to measure eight domains that are pos­sible outcomes for adventure …

Cosmology With Negative Potentials, Gary Felder, Andrei Frolov, Lev Kofman, Andrei Linde

Physics: Faculty Publications

We investigate cosmological evolution in models where the effective potential V(f) may become negative for some values of the field f. Phase portraits of such theories in the space of variables (f,f˙ ,H) have several qualitatively new features as compared with phase portraits in the theories with V(f).0. Cosmological evolution in models with potentials with a ‘‘stable’’ minimum at V(f),0 is similar in some respects to the evolution in models with potentials unbounded from below. Instead of reaching an AdS regime dominated by the negative vacuum energy, the universe reaches a turning point where its energy density vanishes, and then …

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A Recommendation For Determining The Efficacy Of Weight Removal Estimates For The Pacific Cod Longline Cdq Fishery, Anna L. Furniss

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

In January 2000, the Alaska Department of Community and Economic Development contacted the National Marine Fisheries Service (NMFS) regarding concerns over the methods used to determine catch estimates for the Pacific Cod Community Development Quota (CDQ) fishery. Currently, NMFS determines catch estimates for the Pacific Cod CDQ fishery based on the data collected by observers from the North Pacific Groundfish Observer Program (NPGOP).

Observer estimates for catch are based on the random sampling methods for a longline fishing vessel as described in the North Pacific Groundfish Observer Manual. These sampling methods provide an official total catch (OTC) estimate for each …

The Classification Of Low Dimensional Nilpotent Lie Algebras, Kimberli C. Tripp

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

Nilpotent Lie algebras are the fundamental building blocks for generic (not semi-simple) Lie algebras. In particular, the classification of nilpotent algebras is the first step in classifying and identifying solvable Lie Algebras. The problem of classifying nilpotent Lie algebras was first studied by Umlauf [9] in 1891. More recently, classifications have been given up to dimension six using different techniques by Morosov (1958) [7], Skjelbred and Sund (1977) [8], and up to dimension five by Dixmier (1958) [2]. Using Morosov's method of classification by maximal abelian ideals, Winternitz reproduced the Morosov classification obtaining different canonical forms for the algebras. The …

Cooper Pair Islanding Model Of Insulating Nanohoneycomb Films, Shawna M. Hollen, J M. Valles Jr.

Physics & Astronomy

We first review evidence for the Cooper pair insulator (CPI) phase in amorphous nanohoneycomb (NHC) films. We then extend our analysis of superconducting islands induced by film thickness variations in NHC films to examine the evolution of island sizes through the magnetic field-driven SIT. Finally, using the islanding picture, we present a plausible model for the appearance and behavior of the CPI phase in amorphous NHC films.

3-Methoxy-1'-Phenyl-4'[Beta],5-Di­Hydro-1h-Pyrazolo­[4',3':16,17]­Estra-1,3,5(10)-Triene, Veronica Konig, Thomas R. Schneider, E. Frank, Beatrix Aukszi, Gyula Schneider, Janos Wolfling

Chemistry and Physics Faculty Articles

The regio- and stereochemistry of the title compound, C26H30N2O, has been established by X-ray analysis. The configuration of the stereogenic centre at C-16 proved to be S and the H atom at C-16 adopts the position.

Review: Clean Coastal Waters: Understanding And Reducing The Effects Of Nutrient Pollution., Jonathan Pennock

School of Marine Science and Ocean Engineering

Review of:

Clean Coastal Waters: Understanding and Reducing the Effects of Nutrient Pollution. 2000. Committee on the Causes and Management of Coastal Eutophication, National Research Council. National Academy Press, Washington, D.C. 405 pages. ISBN 0-309-06948-3. US $54.95

A Prototype Asic For Apd Array Readout Of Scintillating Plastic Fibers, John R. Macri, A L. Wintenerg, Mark Widholm, U Jagadish, J Ledoux, Mark L. Mcconnell, S Shane Frank, Hansford H. Cutlip

Space Science Center

We report on the development of custom front-end electronics for use with avalanche photodiode (APD) arrays as part of a NASA technology study for the readout of scintillating plastic fibers. APD arrays featuring 64 1 mm square pixels are used. We demonstrate that a pixel of these APD arrays coupled to relatively thin (0.25 mm) and short (15 cm) scintillating plastic fibers can be used to detect and measure the tracks of even minimum ionizing particles (MIPs). An applicationspecific integrated circuit (ASIC) implementation of the electronics is required to produce a detector sufficiently compact for practical use in a flight …

Readout And Performance Of Thick Czt Strip Detectors With Orthogonal Coplanar Anodes, John R. Macri, B Donmez, L A. Hamel, Manuel Julien, M Mcclish, Mark L. Mcconnell, R S. Miller, James M. Ryan, Mark Widholm

Space Science Center

We report progress in the study of CZT strip detectors featuring orthogonal coplanar anode contacts. The work includes laboratory and simulation studies aimed at optimizing and developing compact, efficient, high performance detector modules for 0.05 to 1 MeV gamma radiation measurements. The novel coplanar anode strip configuration retains many of the performance advantages of pixel detectors yet requires far fewer electronic channels to perform both 3-d imaging and spectroscopy. We report on studies aimed at determining an optimum configuration of the analog signal processing electronics to employ with these detectors. We report measurements of energy and spatial resolution in three …

Frame Of Reference Interaction., Matthew D. Plumlee, Colin Ware

Center for Coastal and Ocean Mapping

We present a unified set of 3D interaction techniques that demonstrates an alternative way of thinking about the navigation of large virtual spaces in non-immersive environments. Our alternative conceptual framework views navigation from a cognitive perspective—as a way of facilitating changes in user attention from one reference frame to another—rather than from the mechanical perspective of moving a camera between different points of interest. All of our techniques link multiple frames of reference in some meaningful way. Some techniques link multiple windows within a zooming environment while others allow seamless changes of user attention between static objects, moving objects, and …

The Temporal Spectrum Of The Sdb Pulsating Star Hs 2201+2610 At 2 Ms Resolution, R Silvotti, T D. Oswalt, Nicole M. Silvestri, Glenn Carlson

Aerospace, Physics, and Space Science Faculty Publications

In this article we present the results of more than 180 hours of time-series photometry on the low gravity (log g = 5.4, Teff = 29 300 K, log He/H = -3.0 by number) sdB pulsating star HS 2201+2610, obtained between September 2000 and August 2001. The temporal spectrum is resolved and shows 5 close frequencies: three main signals at 2860.94, 2824.10 and 2880.69 μHz, with amplitudes of about 1%, 0.5% and 0.1% respectively, are detected from single run observations; two further peaks with very low amplitude (<0.07%) at 2738.01 and 2921.82 μHz are confirmed by phase analysis on several independent runs. Due to the small number of detected frequencies, it is not possible to obtain a univocal identification of the excited modes and perform a detailed seismological analysis of the star. No clear signatures of rotational splitting are seen. Nevertheless, the observed period spectrum is well inside the excited period window obtained from pulsation calculations with nonadiabatic models having effective temperature and surface gravity close to the spectroscopic estimates. Due to its relatively simple temporal spectrum, HS 2201+2610 is a very good candidate for trying to measure the secular variation of the pulsation periods in time. With this purpose a long-term monitoring of the star was started. The results of the first 11 months show amplitude variations up to ∼20% on time-scales of months, which are probably real, and allow us to measure the pulsation frequencies with an unprecedented 0.02 μHz resolution.

Asteroseismology Of Rxj 2117+3412, The Hottest Pulsating Pg 1159 Star, G Vauclair, Matt A. Wood

Aerospace, Physics, and Space Science Faculty Publications

The pulsating PG 1159 planetary nebula central star RXJ 2117+3412 has been observed over three successive seasons of a multisite photometric campaign. The asteroseismological analysis of the data, based on the 37 identified ℓ = 1 modes among the 48 independent pulsation frequencies detected in the power spectrum, leads to the derivation of the rotational splitting, the period spacing and the mode trapping cycle and amplitude, from which a number of fundamental parameters can be deduced. The average rotation period is 1.16 ± 0.05 days. The trend for the rotational splitting to decrease with increasing periods is incompatible with a …

One-Sided Resonance For Quasilinear Problems With Asymmetric Nonlinearities, Kanishka Perera

Mathematics and System Engineering Faculty Publications

One-sided resonance for quasilinear problems with asymmetric nonlinearities

Resonance Problems With Respect To The Fučík Spectrum Of The P-Laplacian, Kanishka Perera

Mathematics and System Engineering Faculty Publications

We solve resonance problems with respect to the Fučík spectrum of the p-Laplacian using variational methods.

An Upper And Lower Solution Approach For A Generalized Thomas–Fermi Theory Of Neutral Atoms, Ravi P. Agarwal, Donal O'Regan

Mathematics and System Engineering Faculty Publications

An upper and lower solution theory for boundary value problems modeled from the Thomas-Fermi equation, was presented. The approach was subjected to a boundary condition corresponding to the neutral atom with Bohr radius. The boundary conditions were investigated for the neutral atoms, the ionized atoms and the isolated neutral atoms.

Asymptotic Inference For Spatial Cdfs Over Time, Jun Zhu, S N. Lahiri, Noel A. Cressie

Faculty of Informatics - Papers (Archive)

A spatial cumulative distribution function (SCDF) is a random function that provides a statistical summary of a random process over a spatial domain of interest. In this paper, we consider a spatio-temporal process and establish statistical methodology to analyze changes in the SCDF over time. We develop hypothesis testing to detect a difference in the spatial random processes at two time points, and we construct a prediction interval to quantify such discrepancy in the corresponding SCDFs. Using a spatial subsampling method, we show that our inferences are valid asymptotically. As an illustration, we apply these inference procedures to test and …

Spatial Mixture Models Based On Exponential Family Conditional Distributions, M Kaiser, Noel A. Cressie, J Lee

Faculty of Informatics - Papers (Archive)

Spatial statistical models are applied in many problems for which dependence in observed random variables is not easily explained by a direct scientific mechanism. In such situations there may be a latent spatial process that acts to produce the observed spatial pattern. Scientific interest often centers on the latent process and the degree of spatial dependence that characterizes it. Such latent processes may be thought of as spatial mixing distributions. We present methods for the specification of flexible joint distributions to model spatial processes through multi-parameter exponential family conditional distributions. One approach to the analysis of these models is Monte …

Fast, Resolution-Consistent Spatial Prediction Of Global Processes From Satellite Data, Hsin-Cheng Huang, Noel A. Cressie, John Gabrosek

Faculty of Informatics - Papers (Archive)

Polar orbiting satellites remotely sense the earth and its atmosphere, producing datasets that give daily global coverage. For any given day, the data are many and measured at spatially irregular locations. Our goal in this article is to predict values that are spatially regular at different resolutions; such values are often used as input to general circulation models (GCMs) and the like. Not only do we wish to predict optimally, but because data acquisition is relentless, our algorithm must also process the data very rapidly. This article applies a multiresolution autoregressive tree-structured model, and presents a new statistical prediction methodology …

The Estimation Of Continuous Pq Disturbance Levels In Distribution Systems, Victor J. Gosbell, D A. Robinson

Faculty of Informatics - Papers (Archive)

A simple method is given for estimating the continuous PQ disturbance level at a site. It is based on determining a "Voltage Distortion Increment" (VDI) for each segment of the network and then adding the VDIs from a given site back to an upstream site where levels are taken to be zero. The VDI is conveniently expressible in the form of S(MVA) times length (km), where "length" correspond to the physical length in the case of MV overhead lines and an equivalent length for other components. The method is verified by a comparison with field survey data. The voltage distortion …

Sources Of Error In Unbalance Measurements, Victor J. Gosbell, H Herath, Sarath Perera, D A. Robinson

Faculty of Informatics - Papers (Archive)

The paper aims to assess sources of error in attempting to meet standards for the measurement and reporting of negative sequence voltage unbalance. This is of importance when making use of low performance instrumentation where three difficulties may arise: (i) rms voltages rather than the fundamental is used; (ii) the magnitude but not the phase of line-neutral voltages are available; and (iii) voltage values are averaged over a period longer than standards require. The presence of harmonics at normal levels is shown to give negligible error on unbalance calculations. When lineneutral voltages are used, and zero sequence is present, the …

Cohomology Of Buildings And Finiteness Properties Of An-Groups, Jacqueline Ramagge, Wayne W. Wheeler

Faculty of Informatics - Papers (Archive)

Borel and Serre calculated the cohomology of the building associated to a reductive group and used the result to deduce that torsion-free S-arithmetic groups are duality groups. By replacing their group-theoretic arguments with proofs relying only upon the geometry of buildings, we show that Borel and Serre's approach can be modied to calculate the cohomology of any locally nite ane building. As an application we show that any nitely presented e An-group is a virtual duality group. A number of other niteness conditions for e An-groups are also established.

Use Of Cryoelectronics To Reduce Power Losses, Christopher J. Hawley, Steve Gower, Dominic Cuiuri

Faculty of Informatics - Papers (Archive)

The operational characteristics of power electronics operating at ambient temperatures are well known. Less well known are the characteristics of these devices when operating at cryogenic temperatures. This emerging field is known as cryoelectronics. The primary driver for operation at reduced temperatures is the promise of a resultant reduction in device operation losses. The operating characteristics of Metal Oxide Silicon Field Effect Transistors (MOSFETs) and Insulated Gate Bipolar Transistors (IGBTs) at Liquid Nitrogen (LN) temperature have been experimentally analysed. The results have been used to evaluate the viability of using cryoelectronics in medium - high power applications, considering trade-offs between …

Modelling Of High Temperature Superconducting Wires And Coils, Christopher David Cook, T Hardono

Faculty of Informatics - Papers (Archive)

This paper discusses modelling techniques for high temperature superconducting (HTSC) wires and coils. Models are developed based on the behaviour of Bi-2223/Ag wires and coils. For many power-engineering applications it is necessary to form HTSC wires into coils. PSpice models for HTSC coils will be presented in this paper. The aim is to develop models for HTSC wires and coils so that they can be treated as circuit elements in PSpice. The critical current of a coil will in general be different from the wire it is manufactured from and this change in current for a HTSC coil will be …

Sensorless Force Estimation For Robots With Friction, John L. Simpson, Christopher David Cook, Zheng Li

Faculty of Informatics - Papers (Archive)

No abstract provided.

Cmos Sensor Cross-Talk Compensation For Digital Cameras, Wanqing Li, Philip Ogunbona, Yu Shi, Igor Kharitonenko

Faculty of Informatics - Papers (Archive)

This paper presents two algorithms for removing the cross-talk effect in CMOS sensor based color-imaging systems. The algorithms work on the Bayer raw data and have low computational complexity. Experimental results on Macbeth color chart and real images demonstrated that both algorithms can effectively eliminate the cross-talk effect and produce better quality images with conventional color interpolation and correction algorithms designed for CCD image sensors. Complexity of the algorithms is also analyzed.

Modelling Of Color Cross-Talk In Cmos Image Sensors, Wanqing Li, Philip Ogunbona, Yan Shi, Igor Kharitonenko

Faculty of Informatics - Papers (Archive)

This paper presents a way to model the cross-talk effect in CMOS image sensors. Two algorithms are derived from the model; both of them work on the Bayer raw data and have low computational complexity. Experiments on Macbeth color chart and real images have shown the effectiveness of the modeling to eliminate the cross-talk effect and produce better quality images with traditional color interpolation and correction algorithms designed for CCD image sensors.