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Articles 1 - 28 of 28
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Self-Assembled In0.5Ga0.5As Quantum Dots On Gap, Yuncheng Song, Paul J. Simmonds, Minjoo Larry Lee
Self-Assembled In0.5Ga0.5As Quantum Dots On Gap, Yuncheng Song, Paul J. Simmonds, Minjoo Larry Lee
Paul J. Simmonds
We demonstrate the growth and luminescence of coherently strained In0.5Ga0.5As self-assembled quantum dots on GaP. Cross-sectional and planar-view transmission electron microscopy confirmed the dislocation-free nature of the In0.5Ga0.5As quantum dots and GaP cap layers. Intense photoluminescence from the quantum dots was measured at 80 K and was visible to the unaided eye in ambient lighting. The photoluminescence results show that emission energy can be controlled by varying the In0.5Ga0.5As deposition thickness. In combination with recent advances in the growth of GaP on Si, the In0.5Ga0.5 …
Too Little, Too Late: How The Tidal Evolution Of Hot Jupiters Affects Transit Surveys Of Clusters, John H. Debes, Brian Jackson
Too Little, Too Late: How The Tidal Evolution Of Hot Jupiters Affects Transit Surveys Of Clusters, John H. Debes, Brian Jackson
Brian Jackson
The tidal evolution of hot Jupiters may change the efficiency of transit surveys of stellar clusters. The orbital decay that hot Jupiters suffer may result in their destruction, leaving fewer transiting planets in older clusters. We calculate the impact tidal evolution has for different assumed stellar populations, including that of 47 Tuc, a globular cluster that was the focus of an intense Hubble Space Telescope search for transits. We find that in older clusters, one expects to detect fewer transiting planets by a factor of 2 for surveys sensitive to Jupiter-like planets in orbits out to 0.5 AU, and up …
Transforming Learning: Using A Multi-User Virtual Environment For Simulation, Michelle Honey, Kelley Connor
Transforming Learning: Using A Multi-User Virtual Environment For Simulation, Michelle Honey, Kelley Connor
Kelley Connor
Simulations are well known in education, including health professional education. Traditionally simulations have included role plays and demonstration rooms where skills can be practiced and more recently high-fidelity mannequins have lifted the level of simulation. The use of the Internet has allowed synchronous learning that permits sharing experiences and social interactivity. One specific option that has emerged which has the potential to transform health professional clinical education is the use of multi-user virtual environments for simulated learning. A pilot using Second Life, a web-based virtual environment, to teach haemorrhage management to undergraduate nurses is described. Findings include that with pre-simulation …
Tensile Strained Island Growth At Step-Edges On Gaas(110), Paul J. Simmonds, M. L. Lee
Tensile Strained Island Growth At Step-Edges On Gaas(110), Paul J. Simmonds, M. L. Lee
Paul J. Simmonds
We report the growth of tensile strained GaP islands on a GaAs(110) surface. Three-dimensional island formation proceeds via a step-edge nucleation process. To explain the dislocation-free nature of these islands, we consider the kinetics of strain relief within the context of a model for dislocation glide as a function of surface orientation and sign of strain.
The Roles Of Tidal Evolution And Evaporative Mass Loss In The Origin Of Corot-7 B, Brian Jackson, Neil Miller, Rory Barnes, Sean N. Raymond, Jonathan J. Fortney, Richard Greenberg
The Roles Of Tidal Evolution And Evaporative Mass Loss In The Origin Of Corot-7 B, Brian Jackson, Neil Miller, Rory Barnes, Sean N. Raymond, Jonathan J. Fortney, Richard Greenberg
Brian Jackson
CoRoT-7 b is the first confirmed rocky exoplanet, but, with an orbital semimajor axis of 0.0172 au, its origins may be unlike any rocky planet in our Solar system. In this study, we consider the roles of tidal evolution and evaporative mass loss in CoRoT-7 b's history, which together have modified the planet's mass and orbit. If CoRoT-7 b has always been a rocky body, evaporation may have driven off almost half its original mass, but the mass loss may depend sensitively on the extent of tidal decay of its orbit. As tides caused CoRoT-7 b's orbit to decay, they …
Recent Transits Of The Super-Earth Exoplanet Gj 1214b, Pedro V. Sada, Drake Deming, Brian Jackson, Donald E. Jennings, Steven W. Peterson, Flynn Haase, Kevin Bays, Eamon O'Gorman, Alan Lundsford
Recent Transits Of The Super-Earth Exoplanet Gj 1214b, Pedro V. Sada, Drake Deming, Brian Jackson, Donald E. Jennings, Steven W. Peterson, Flynn Haase, Kevin Bays, Eamon O'Gorman, Alan Lundsford
Brian Jackson
We report recent ground-based photometry of the transiting super-Earth exoplanet GJ 1214b at several wavelengths, including the infrared near 1.25 μm (J band). We observed a J-band transit with the FLAMINGOS infrared imager and the 2.1 m telescope on Kitt Peak, and we observed several optical transits using a 0.5 m telescope on Kitt Peak and the 0.36 m Universidad de Monterrey Observatory telescope. Our high-precision J-band observations exploit the brightness of the M dwarf host star at this infrared wavelength as compared with the optical and are significantly less affected by stellar activity and limb darkening. We fit the …
Physical Basis Of The Inducer-Dependent Cooperativity Of The Central Glycolytic Genes Repressor/Dna Complex, Denis Chaix, Matthew L. Ferguson, Cedric Atmanene, Alain Van Dorsselaer, Sarah Sanglier-Cianférani, Catherine A. Royer, Nathalie Declerck
Physical Basis Of The Inducer-Dependent Cooperativity Of The Central Glycolytic Genes Repressor/Dna Complex, Denis Chaix, Matthew L. Ferguson, Cedric Atmanene, Alain Van Dorsselaer, Sarah Sanglier-Cianférani, Catherine A. Royer, Nathalie Declerck
Matthew L. Ferguson
The Central glycolytic genes Repressor (CggR) from Bacillus subtilis belongs to the SorC family of transcription factors that control major carbohydrate metabolic pathways. Recent studies have shown that CggR binds as a tetramer to its tandem operator DNA sequences and that the inducer metabolite, fructose 1,6-bisphosphate (FBP), reduces the binding cooperativity of the CggR/DNA complex. Here, we have determined the effect of FBP on the size, shape and stoichiometry of CggR complexes with full-length and half-site operator sequence by small-angle X-ray scattering, size-exclusion chromatography, fluorescence cross-correlation spectroscopy and noncovalent mass spectrometry (MS). Our results show that CggR forms a compact …
Agolohymena Aspidocauda Nov. Gen., Nov. Spec., A Histophagous Freshwater Tetrahymenid Ciliate In The Family Deltopylidae (Ciliophora, Hymenostomatia), From Idaho (Northwest U.S.A.): Morphology, Ontogenesis And Molecular Phylogeny, William A. Bourland, Michaela C. Strüder-Kypke
Agolohymena Aspidocauda Nov. Gen., Nov. Spec., A Histophagous Freshwater Tetrahymenid Ciliate In The Family Deltopylidae (Ciliophora, Hymenostomatia), From Idaho (Northwest U.S.A.): Morphology, Ontogenesis And Molecular Phylogeny, William A. Bourland, Michaela C. Strüder-Kypke
William Bourland
Morphology, ontogeny and the molecular phylogeny of Agolohymena aspidocauda nov. gen., nov. spec., a new freshwater tetrahymenid ciliate from Idaho, U.S.A, are described. The ontogeny and histophagous mode of nutrition are similar to those of Deltopylum rhabdoides Fauré-Fremiet and Mugard, 1946. The new genus is placed with Deltopylum in the resurrected family Deltopylidae Song & Wilbert, 1989. We emend the diagnostic features of the family to include division by polytomy, right and left somatic kineties extending into the preoral suture, crook-shaped or sigmoid adoral membranelles 1 and 2, markedly reduced adoral membranelle 3 and a tetrahymenid silverline pattern. The main …
Tensile Strained Iii-V Self-Assembled Nanostructures On A (110) Surface, Minjoo L. Lee, Paul J. Simmonds
Tensile Strained Iii-V Self-Assembled Nanostructures On A (110) Surface, Minjoo L. Lee, Paul J. Simmonds
Paul J. Simmonds
The vast majority of research on epitaxial quantum dots use compressive strain as the driving force for self-assembly on the (001) surface, with InAs/GaAs(001) and Ge/Si(001) being the best-known examples. In this talk, I will discuss our work on determining the feasibility of growing coherent, tensile-strained III-V nanostructures on a (110) surface. GaP on GaAs(110) was chosen as an initial test system. It is hoped that our efforts on self-assembled, tensile-strained dots on a (110) surface will lead the way to new devices exploiting the fundamental differences between the (110) and (001) surfaces. Furthermore it is anticipated that this work …
Making Space For The “Nuances Of Truth”: Communication And Uncertainty At An Environmental Journalists’ Workshop, Jen Schneider
Making Space For The “Nuances Of Truth”: Communication And Uncertainty At An Environmental Journalists’ Workshop, Jen Schneider
Jen Schneider
In 2008, the Society of Environmental Journalists listed nearly 50 science or science immersion workshops for environmental journalists. Yet relatively little is known about the content of these workshops and their impact on participants. This ethnographic study, conducted at a science immersion workshop for environmental journalists, aims to fill this void in our knowledge. Relying on participant observation and depth interviews, the study suggests that such workshops are useful for participating journalists: Reporters feel they leave the workshop better understanding the scientific method and scientific uncertainty. But the findings also reveal that “metacommunication”—communication about communication—is equally as important as science …
Texting: Leveraging The Statistics To Your Advantage, Amy E. Vecchione
Texting: Leveraging The Statistics To Your Advantage, Amy E. Vecchione
Amy E. Vecchione
No abstract provided.
Sources Of Non-Conformity In Phonology: Variation And Exceptionality In Modern Hebrew Spirantization (Dissertation), Michal Temkin Martinez
Sources Of Non-Conformity In Phonology: Variation And Exceptionality In Modern Hebrew Spirantization (Dissertation), Michal Temkin Martinez
Michal Temkin Martinez
This dissertation investigates the integration of two sources of non-conformity – exceptionality and variation – in a single phonological system. Exceptionality manifests itself as systematic non-conformity, and variation as partial or variable non-conformity. When both occur within the same phenomenon, this is particularly challenging for the linguistic system. Modern Hebrew spirantization provides an apt case study for the investigation of the interaction of these two sources of non-conformity where exceptional (non-alternating) segments are frequent, and variation in alternating segments has been reported (Adam 2002). This dissertation makes contributions in the forms of both data and analysis. Its goals are to …
Idaho Bird Observatory: Research, Education, Conservation - 24/7, Elise Faike
Idaho Bird Observatory: Research, Education, Conservation - 24/7, Elise Faike
Jay D. Carlisle
The Idaho Bird Observatory’s Lucky Peak bird monitoring station atop the foothills overlooking Boise is unique. During fall migration, it’s the only place in western North America that hosts some form of songbird or raptor research all day and all night—for downright fun 24/7!
Reproducibility Of Soil Moisture Ensembles When Representing Soil Parameter Uncertainty Using A Latin Hypercube–Based Approach With Correlation Control, Alejandro N. Flores, Dara Entekhabi, Rafael L. Bras
Reproducibility Of Soil Moisture Ensembles When Representing Soil Parameter Uncertainty Using A Latin Hypercube–Based Approach With Correlation Control, Alejandro N. Flores, Dara Entekhabi, Rafael L. Bras
Alejandro N. Flores
Representation of model input uncertainty is critical in ensemble-based data assimilation. Monte Carlo sampling of model inputs produces uncertainty in the hydrologic state through the model dynamics. Small Monte Carlo ensemble sizes are desirable because of model complexity and dimensionality but potentially lead to sampling errors and correspondingly poor representation of probabilistic structure of the hydrologic state. We compare two techniques to sample soil hydraulic and thermal properties (SHTPs): (1) Latin Hypercube (LH) based sampling with correlation control and (2) random sampling from SHTP marginal distributions. A hydrology model is used to project SHTP uncertainty onto the soil moisture state …
Growth Of Metamorphic Ingap For Wide-Bandgap Photovoltaic Junction By Mbe, John Simon, Stephanie Tomasulo, Paul J. Simmonds, Manuel J. Romero, Minjoo Larry Lee
Growth Of Metamorphic Ingap For Wide-Bandgap Photovoltaic Junction By Mbe, John Simon, Stephanie Tomasulo, Paul J. Simmonds, Manuel J. Romero, Minjoo Larry Lee
Paul J. Simmonds
Metamorphic triple-junction solar cells can currently attain efficiencies as high as 41.1%. Using additional junctions could lead to efficiencies above 50%, but require the development of a wide bandgap (2.0-2.2eV) material to act as the top layer. In this work we demonstrate wide bandgap InyGa1-yP grown on GaAsxP1-x via solid source molecular beam epitaxy. Unoptimized tensile GaAsxP1-x buffers grown on GaAs exhibit asymmetric strain relaxation, along with formation of faceted trenches 100-300 nm deep in the [01-1] direction. Smaller grading step size and higher substrate temperatures minimizes the facet trench …
Point-Of-Contact, Dna-Based Amplifier For Detecting Cancer-Related Micro-Rna In Blood Serum, Elton Graugnard, Amber Cox, Jeunghoon Lee, Cheryl Jorcyk, Bernard Yurke, William L. Hughes
Point-Of-Contact, Dna-Based Amplifier For Detecting Cancer-Related Micro-Rna In Blood Serum, Elton Graugnard, Amber Cox, Jeunghoon Lee, Cheryl Jorcyk, Bernard Yurke, William L. Hughes
Elton Graugnard
No abstract provided.
Research Consortium Scholar Lecture: Off The Couch And Into The Gym—Women And Physical Activity, Lynda B. Ransdell
Research Consortium Scholar Lecture: Off The Couch And Into The Gym—Women And Physical Activity, Lynda B. Ransdell
Lynda Ransdell
Researchers have made progress identifying women’s physical activity participation levels and preferences. However, we have a long way to go to develop programs that stimulate women’s long-term participation in physical activity. The primary focus of Dr. Lynda Ransdell’s 2010 Research Consortium Scholar Lecture is to trace key recommendations for increasing physical activity in women across the age spectrum. In addition, she will compare and contrast the experiences of sedentary women with active and athletic women. Specifically, this presentation will examine sedentary, active, and athletic females across the developmental spectrum (from the adolescent to the older adult) and discuss strategies for …
Optimized Stochastic Resonance Method For Signal Detection And Image Processing, Hao Chen, P. K. Varshney, J. H. Michels
Optimized Stochastic Resonance Method For Signal Detection And Image Processing, Hao Chen, P. K. Varshney, J. H. Michels
Hao Chen
Apparatus and method for improving the detection of signals obscured by noise using stochastic resonance noise. The method determines the stochastic resonance noise probability density function in non-linear processing applications that is added to the observed data for optimal detection with no increase in probability of false alarm. The present invention has radar, sonar, signal processing (audio, image and video), communications, geophysical, environmental, and biomedical applications.
An Experimental Investigation Of Variation In Modern Hebrew, Michal Temkin Martinez
An Experimental Investigation Of Variation In Modern Hebrew, Michal Temkin Martinez
Michal Temkin Martinez
This paper reports the results of an experimental rating task testing the acceptability of variation in Modern Hebrew spirantization. Modern Hebrew spirantization is manifested by the alternation of the stops [p], [b], and [k] with their fricative counterparts [f], [v], and [x], in which fricatives occur post-vocalically and root-finally, and stops occur elsewhere, as in (1). (1) /p/ to [f] /pgS/ [lifgoS] [pagaS] ‘to meet’ /b/ to [v] /bgd/ [livgod] [bagad] ‘to betray’ /k/ tp [x] /ktb/ [lixtov] [katav] ‘to write’ Due to historical sound mergers and more recent borrowings, there are acoustically identical stops and fricatives that do not …
Green Building In The Pacific Northwest: Next Steps For An Emerging Trend, Susan G. Mason, Anthony Marker, Rebecca Mirsky
Green Building In The Pacific Northwest: Next Steps For An Emerging Trend, Susan G. Mason, Anthony Marker, Rebecca Mirsky
Susan G. Mason
This report provides an understanding of why green building is important to our communities, a brief look at the emergence of green building standards, research evidence on the perceived pros and cons of green building, and original research on green building in the Pacific Northwest. The original research is an analysis of perspectives voiced in conversations, focus groups and surveys with both members of the construction industry and local government on the barriers and incentives to green building in their local communities. As nearly 500 construction industry members and just over 300 local governments participated in the research, this report …
Corot-7b: Super-Earth Or Super-Io?, Rory Barnes, Sean N. Raymond, Richard Greenberg, Brian Jackson, Nathan A. Kaib
Corot-7b: Super-Earth Or Super-Io?, Rory Barnes, Sean N. Raymond, Richard Greenberg, Brian Jackson, Nathan A. Kaib
Brian Jackson
CoRoT-7b, a planet about 70% larger than the Earth orbiting a Sun-like star, is the first-discovered rocky exoplanet, and hence has been dubbed a "super-Earth." Some initial studies suggested that since the planet is so close to its host star, it receives enough insolation to partially melt its surface. However, these past studies failed to take into consideration the role that tides may play in this system. Even if the planet's eccentricity has always been zero, we show that tidal decay of the semimajor axis could have been large enough that the planet formed on a wider orbit which received …
Grappling With Climate Change: Impacts To Heritage Resources, Lauren Meyer, Pei-Lin Yu, Randall Skeirik, Virginia Salazar-Halfmoon
Grappling With Climate Change: Impacts To Heritage Resources, Lauren Meyer, Pei-Lin Yu, Randall Skeirik, Virginia Salazar-Halfmoon
Pei-Lin Yu
17th century adobe walls collapsing at Tumacácori; historic inscriptions rapidly eroding at El Morro; ancestral pueblo field houses at Bandelier impacted by significant soil erosion. Is this deterioration and loss the result of a lack of proper maintenance, a misunderstanding of the needs of fragile site materials, the cumulative effects of 'normal' deterioration, or the result of random and unpredictable natural events and material failures? Could any (or all) of it be related to climate change? As a cultural resource manager, climate change is a difficult matter to grapple with. Can one comfortably say that a wall collapse is the …
Estimation, Training, And Effect Of Timing Offsets In Distributed Cooperative Networks, Hani Mehrpouyan, Steven D. Blostein
Estimation, Training, And Effect Of Timing Offsets In Distributed Cooperative Networks, Hani Mehrpouyan, Steven D. Blostein
Hani Mehrpouyan
Successful collaboration in cooperative networks requires accurate estimation of multiple timing offsets. When combined with signal processing algorithms, the estimated timing offsets can be applied to mitigate the resulting inter-symbol interference (ISI). This paper seeks to address timing synchronization in distributed multi-relay amplify-and-forward (AF) and decode-andforward (DF) relaying networks, where timing offset estimation using a training sequence is analyzed. First, training sequence design guidelines are presented that are shown to result in improved estimation performance. Next, two iterative estimators are derived that can determine multiple timing offsets at the destination. The proposed estimators have a considerably lower computational complexity while …
Bounds On Timing Jitter Estimation In Cooperative Networks, Hani Mehrpouyan, Steven Blostein
Bounds On Timing Jitter Estimation In Cooperative Networks, Hani Mehrpouyan, Steven Blostein
Hani Mehrpouyan
Successful collaboration and resource sharing in cooperative networks require accurate estimation of multiple timing jitters. When combined with signal processing algorithms the estimated timing jitters can be applied to mitigate the resulting inter-symbol interference (ISI) and improve performance. In this paper we seek to derive the Cramer-Rao lower bounds (CRLB) for timing jitter estimation in distributed cooperative networks. In addition to being a benchmark for judging the performance of timing jitter estimators, the CRLBs can be applied to determine the effect of the choices of training sequence and cooperative protocol on timing jitter estimation.
Synchronization In Cooperative Networks: Estimation Of Multiple Carrier Frequency Offsets, Hani Mehrpouyan, Steven Blostein
Synchronization In Cooperative Networks: Estimation Of Multiple Carrier Frequency Offsets, Hani Mehrpouyan, Steven Blostein
Hani Mehrpouyan
The distributed nature of cooperative networks may result in multiple carrier frequency offsets (CFOs), which make the channel time-varying and overshadow the performance gainspromised by collaborative communications. However, much of the analysis in the area of cooperative communications assumes perfect synchronization. This paper seeks to address frequency synchronization in cooperative communication systems, where CFO estimation using a training sequence is analyzed. The Cramer-Rao lower bound (CRLB) for various cooperative protocols is derived. In the next step, we propose two computationally efficient iterative estimators based on the MUltiple SIgnal Characterization (MUSIC) algorithm, that can estimate the CFOs from all the relays …
Characteristics That Enhance Training Effectiveness In Implementing Technological Change In Sales Strategy: A Field-Based Exploratory Study, Shikhar Sarin, Trina Sego, Ajay K. Kohli, Goutam Challagalla
Characteristics That Enhance Training Effectiveness In Implementing Technological Change In Sales Strategy: A Field-Based Exploratory Study, Shikhar Sarin, Trina Sego, Ajay K. Kohli, Goutam Challagalla
Shikhar Sarin
No abstract provided.
Environmental Crisis And Religious Rhetoric In Is God Green?, Jen Schneider
Environmental Crisis And Religious Rhetoric In Is God Green?, Jen Schneider
Jen Schneider
In the 2006 PBS documentary Is God Green?, Bill Moyers presents the emergence of two key contemporary trends in American political and religious life. The first is the growing popularity of an environmental movement within Christian evangelicalism called 'Creation Care'. Motivated by biblical passages that suggest humans have been 'commissioned' as stewards to care for the earth, or 'God's Body', Creation Care emerged in the late 1970s, gained momentum in the 1990s, and now 'constitutes the "fastest-growing form of Christian ministry"', according to the evangelical publication Christianity Today (Frame 1996:84, see also Psaros 2006:20-32). Is God Green? highlights what …
Inexpensive Time-Lapse Digital Cameras For Studying Transient Meteorological Phenomena: Dust Devils And Playa Flooding, Ralph D. Lorenz, Brian Jackson, Jason W. Barnes
Inexpensive Time-Lapse Digital Cameras For Studying Transient Meteorological Phenomena: Dust Devils And Playa Flooding, Ralph D. Lorenz, Brian Jackson, Jason W. Barnes
Brian Jackson
The authors describe the design and performance of inexpensive and compact time-lapse cameras suitable for field deployment in remote locations for long periods and their application to studying two time-variable meteorological phenomena in arid regions: desert dust devils and transient flooding of playa lakes. The camera units (with a total parts cost of ∼$80) are based around commercial “point and shoot” digital cameras, storing ∼1500 images on a solid-state memory card over a period between an hour to several months powered by alkaline batteries. A microcontroller can trigger image acquisition based on sensor inputs or at regular intervals. Some example …