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"Quinn, R"
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Reconciliation(s) : transitional justice in postconflict societies
'Reconciliation(s)' considers the definition of the concept of reconciliation itself, focusing on the definitional dialogue that arises from the attempts to situate reconciliation within a theoretical and analytical framework.
Brain structure and internalizing and externalizing behavior in typically developing children and adolescents
2020
Mental health problems often emerge in adolescence and are associated with reduced gray matter thickness or volume in the prefrontal cortex (PFC) and limbic system and reduced fractional anisotropy (FA) and increased mean diffusivity (MD) of white matter linking these regions. However, few studies have investigated whether internalizing and externalizing behavior are associated with brain structure in children and adolescents without mental health disorders, which is important for understanding the progression of symptoms. 67 T1-weighted and diffusion tensor imaging datasets were obtained from 48 typically developing participants aged 6–16 years (37M/30F; 19 participants had two visits). Volume was calculated in the prefrontal and limbic structures, and diffusion parameters were assessed in limbic white matter. Linear mixed effects models were used to compute associations between brain structure and internalizing and externalizing behavior, assessed using the Behavioral Assessment System for Children (BASC-2) Parent Rating Scale. Internalizing behavior was positively associated with MD of the bilateral cingulum. Gender interactions were found in the cingulum, with stronger positive relationships between MD and internalizing behavior in females. Externalizing behavior was negatively associated with FA of the left cingulum, and the left uncinate fasciculus showed an age–behavior interaction. No relationships between behavior and brain volumes survived multiple comparison correction. These results show altered limbic white matter FA and MD related to sub-clinical internalizing and externalizing behavior and further our understanding of neurological markers that may underlie risk for future mental health disorders.
Journal Article
House of Odd
\"Transforming a ramshackle mansion into a dream house has become a nightmare for onetime Hollywood producer Nedra Nolan, whose newly purchased fixer-upper in Pico Mundo has sent a string of spooked contractors scurrying off the job, claiming the place is haunted. Who's she gonna call? Her friend recommends Odd Thomas, the mild-mannered young man with a gift for communing with ghosts who won't rest in peace. With his soul mate and sidekick, Stormy Llewellyn, in tow, Odd agrees to investigate the eerie incidents.\"--p. [4] of cover.
Increased tree carbon storage in response to nitrogen deposition in the US
by
Quinn Thomas, R.
,
Goodale, Christine L.
,
Canham, Charles D.
in
Anthropogenic factors
,
Carbon dioxide
,
Carbon sequestration
2010
Spatially extensive evidence for nitrogen-induced stimulation of forest growth has been lacking. Analysis of forest inventory data from the northeastern and north-central US collected during the 1980s and 1990s indicates that nitrogen deposition enhanced above-ground carbon storage by 61 kg per kg of nitrogen deposited.
Human activities have greatly accelerated emissions of both carbon dioxide and biologically reactive nitrogen to the atmosphere
1
,
2
. As nitrogen availability often limits forest productivity
3
, it has long been expected that anthropogenic nitrogen deposition could stimulate carbon sequestration in forests
4
. However, spatially extensive evidence for deposition-induced stimulation of forest growth has been lacking, and quantitative estimates from models and plot-level studies are controversial
5
,
6
,
7
,
8
,
9
,
10
. Here, we use forest inventory data to examine the impact of nitrogen deposition on tree growth, survival and carbon storage across the northeastern and north-central USA during the 1980s and 1990s. We show a range of growth and mortality responses to nitrogen deposition among the region’s 24 most common tree species. Nitrogen deposition (which ranged from 3 to 11 kg ha
−1
yr
−1
) enhanced the growth of 11 species and decreased the growth of 3 species. Nitrogen deposition enhanced growth of all tree species with arbuscular mycorrhizal fungi associations. In the absence of disturbances that reduced carbon stocks by more than 50%, above-ground biomass increment increased by 61 kg of carbon per kg of nitrogen deposited, amounting to a 40% enhancement over pre-industrial conditions. Extrapolating to the globe, we estimate that nitrogen deposition could increase tree carbon storage by 0.31 Pg carbon yr
−1
.
Journal Article
The adaptive value of density-dependent habitat specialization and social network centrality
by
Vander Wal, Eric
,
Webber, Quinn M. R.
,
Bonar, Maegwin
in
631/158/1745
,
631/158/856
,
Animal reproduction
2024
Density dependence is a fundamental ecological process. In particular, animal habitat selection and social behavior often affect fitness in a density-dependent manner. The Ideal Free Distribution (IFD) and niche variation hypothesis (NVH) present distinct predictions associated with Optimal Foraging Theory about how the effect of habitat selection on fitness varies with population density. Using caribou (
Rangifer tarandus
) in Canada as a model system, we test competing hypotheses about how habitat specialization, social behavior, and annual reproductive success (co)vary across a population density gradient. Within a behavioral reaction norm framework, we estimate repeatability, behavioral plasticity, and covariance among social behavior and habitat selection to investigate the adaptive value of sociality and habitat selection. In support of NVH, but not the IFD, we find that at high density habitat specialists had higher annual reproductive success than generalists, but were also less social than generalists, suggesting the possibility that specialists were less social to avoid competition. Our study supports niche variation as a mechanism for density-dependent habitat specialization.
Social behavior and habitat specialization are often linked through density-dependence and their effects on fitness. Here, the authors show that in caribou, these traits are density-dependent, but only habitat specialization has an effect on fitness.
Journal Article
A high-mobility electron-transporting polymer for printed transistors
2009
Printed electronics is a revolutionary technology aimed at unconventional electronic device manufacture on plastic foils, and will probably rely on polymeric semiconductors for organic thin-film transistor (OTFT) fabrication. In addition to having excellent charge-transport characteristics in ambient conditions, such materials must meet other key requirements, such as chemical stability, large solubility in common solvents, and inexpensive solution and/or low-temperature processing. Furthermore, compatibility of both p-channel (hole-transporting) and n-channel (electron-transporting) semiconductors with a single combination of gate dielectric and contact materials is highly desirable to enable powerful complementary circuit technologies, where p- and n-channel OTFTs operate in concert. Polymeric complementary circuits operating in ambient conditions are currently difficult to realize: although excellent p-channel polymers are widely available, the achievement of high-performance n-channel polymers is more challenging. Here we report a highly soluble (∼60 g l
-1
) and printable n-channel polymer exhibiting unprecedented OTFT characteristics (electron mobilities up to ∼0.45–0.85 cm
2
V
-1
s
-1
) under ambient conditions in combination with Au contacts and various polymeric dielectrics. Several top-gate OTFTs on plastic substrates were fabricated with the semiconductor-dielectric layers deposited by spin-coating as well as by gravure, flexographic and inkjet printing, demonstrating great processing versatility. Finally, all-printed polymeric complementary inverters (with gain 25–65) have been demonstrated.
Printed transistors
Printed electronics devices show great potential for cheap consumer and health-care products and new applications are rapidly emerging. But device applications are limited by the fact that the plastic semiconductors currently available are almost exclusively 'hole-transporting' materials that operate via the conduction of positive charges. If an electron-transporting equivalent can be found — retaining good electrical transport properties, chemical stability and ease of processing — then it would be possible to use it in tandem with the existing plastic semiconductors to produce yet more powerful devices. Such combinations are known as 'complementary' circuitry. A team working at the Polyera Corporation labs in the United States and at BASF in Germany has produced a new material that achieves that goal. It is a highly soluble electron-transporting plastic semiconductor that exhibits unprecedented device performance, and is compatible with a broad range of printing and processing technologies.
A range of plastic semiconductors have been developed that have the combination of physical and chemical properties required to enable printable electronic circuitry, but these are almost exclusively 'hole transporting' materials. If an electron-transporting equivalent could be found, it could be combined with the existing classes of materials to produce yet more powerful devices. This paper reports the development of a such a material: the electron-transporting plastic semiconductor exhibits unprecedented device performance, and is compatible with a broad range of printing and processing technologies.
Journal Article
Detection of Perchlorate and the Soluble Chemistry of Martian Soil at the Phoenix Lander Site
2009
The Wet Chemistry Laboratory on the Phoenix Mars Lander performed aqueous chemical analyses of martian soil from the polygon-patterned northern plains of the Vastitas Borealis. The solutions contained approximately 10 mM of dissolved salts with 0.4 to 0.6% perchlorate (ClO₄) by mass leached from each sample. The remaining anions included small concentrations of chloride, bicarbonate, and possibly sulfate. Cations were dominated by Mg²⁺ and Na⁺, with small contributions from K⁺ and Ca²⁺. A moderately alkaline pH of 7.7 ± 0.5 was measured, consistent with a carbonate-buffered solution. Samples analyzed from the surface and the excavated boundary of the approximately 5-centimeter-deep ice table showed no significant difference in soluble chemistry.
Journal Article
A Multi‐Model Ensemble of Baseline and Process‐Based Models Improves the Predictive Skill of Near‐Term Lake Forecasts
by
Thomas, R. Quinn
,
Carey, Cayelan C.
,
Breef‐Pilz, Adrienne
in
Automation
,
baseline models
,
climate
2024
Water temperature forecasting in lakes and reservoirs is a valuable tool to manage crucial freshwater resources in a changing and more variable climate, but previous efforts have yet to identify an optimal modeling approach. Here, we demonstrate the first multi‐model ensemble (MME) reservoir water temperature forecast, a forecasting method that combines individual model strengths in a single forecasting framework. We developed two MMEs: a three‐model process‐based MME and a five‐model MME that includes process‐based and empirical models to forecast water temperature profiles at a temperate drinking water reservoir. We found that the five‐model MME improved forecast performance by 8%–30% relative to individual models and the process‐based MME, as quantified using an aggregated probabilistic skill score. This increase in performance was due to large improvements in forecast bias in the five‐model MME, despite increases in forecast uncertainty. High correlation among the process‐based models resulted in little improvement in forecast performance in the process‐based MME relative to the individual process‐based models. The utility of MMEs is highlighted by two results: (a) no individual model performed best at every depth and horizon (days in the future), and (b) MMEs avoided poor performances by rarely producing the worst forecast for any single forecasted period (<6% of the worst ranked forecasts over time). This work presents an example of how existing models can be combined to improve water temperature forecasting in lakes and reservoirs and discusses the value of utilizing MMEs, rather than individual models, in operational forecasts. Key Points Aggregated lake temperature forecast skill was higher for multi‐model ensemble (MME) forecasts than individual model forecasts Including baseline empirical models (day‐of‐year, persistence) with process models improved MME forecast performance MME forecasts improved forecast skill by “hedging,” as no individual model performed best at all horizons or depths
Journal Article
Evidence for Calcium Carbonate at the Mars Phoenix Landing Site
2009
Carbonates are generally products of aqueous processes and may hold important clues about the history of liquid water on the surface of Mars. Calcium carbonate (approximately 3 to 5 weight percent) has been identified in the soils around the Phoenix landing site by scanning calorimetry showing an endothermic transition beginning around 725°C accompanied by evolution of carbon dioxide and by the ability of the soil to buffer pH against acid addition. Based on empirical kinetics, the amount of calcium carbonate is most consistent with formation in the past by the interaction of atmospheric carbon dioxide with liquid water films on particle surfaces.
Journal Article