2,390 research outputs found
The University of New Hampshire Engaged Scholars Academy: Instilling in Faculty Principles of Effective Partnership
Over the last decade, the University of New Hampshire (UNH) has promoted mutually beneficial partnerships between faculty and community partners vis-Ă -vis the Engaged Scholars Academy (ESA), a faculty development program aimed at enhancing faculty understanding of the principles of partnership and engaged scholarship. This research seeks to determine whether and how the ESA has impacted faculty-community partnerships around engaged scholarship. Findings suggest that Engaged Scholar Academy participants â as compared to non-participants â have a deeper understanding of the principles of partnership, are more likely to feel their scholarship is enhanced, spend more time with partners, engage their partners throughout the process of inquiry, and focus more on sustaining partnership outcomes
Submillimeter polarisation and magnetic field properties in the envelopes of proto-planetary nebulae CRL 618 and OH 231.8+4.2
We have carried out continuum and line polarisation observations of two
Proto-planetary nebulae (PPNe), CRL 618 and OH 231.8+4.2, using the
Submillimeter Array (SMA) in its compact configuration. The frequency range of
observations, 330-345 GHz, includes the CO(J=3-2) line emission. CRL 618 and OH
231.8+4.2 show quadrupolar and bipolar optical lobes, respectively, surrounded
by a dusty envelope reminiscent of their AGB phase. We report a detection of
dust continuum polarised emission in both PPNe above 4 sigma but no molecular
line polarisation detection above a 3 sigma limit. OH 231.8+4.2 is slightly
more polarised on average than CRL 618 with a mean fractional polarisation of
4.3 and 0.3 per cent, respectively. This agrees with the previous finding that
silicate dust shows higher polarisation than carbonaceous dust. In both
objects, an anti-correlation between the fractional polarisation and the
intensity is observed. Neither PPNe show a well defined toroidal equatorial
field, rather the field is generally well aligned and organised along the polar
direction. This is clearly seen in CRL 618 while in the case of OH 231.8+4.2,
the geometry indicates an X-shaped structure coinciding overall with a
dipole/polar configuration. However in the later case, the presence of a
fragmented and weak toroidal field should not be discarded. Finally, in both
PPNe, we observed that the well organised magnetic field is parallel with the
major axis of the 12CO outflow. This alignment could indicate the presence of a
magnetic outflow launching mechanism. Based on our new high resolution data we
propose two scenarios to explain the evolution of the magnetic field in evolved
stars.Comment: 11 pages, 8 figures and 1 table. Accepted for publication in the
Monthly Notices of the Royal Astronomical Societ
Establishment of the Minimum Biological Capacity for Nitrogen Excretion in Pigs
To determine the minimum biological capacity for nitrogen (N) excretion for pigs, dietary regimens were created and fed that were designed to eliminate fecal excretion of undigested feed N, minimize endogenous N secretions and minimize intakes of nitrogenous compounds (amino acids) above those of the pigs biological needs. Excretion of undigested fecal N was eliminated by feeding ingredients containing highly digestible (â100%) sources of nitrogen and by eliminating compounds that bind N. Endogenous secretions were minimized by eliminating antinutritional factors from the diet and by minimizing enteric bacterial populations. Intakes of amino acids above the animal\u27s needs were minimized by providing a pattern of amino acids that closely matched that needed by the pig. Furthermore, dietary amino acids were provided to the pigs in amounts above, at, and below their biological needs based on the amounts of urea N excreted in the urine and the amounts of N accrued in the body. From two-slope breakpoint analysis, apparent digestible N intake resulting in maximum N retention (2.58gâ
kg-1BW.75â
d-1) was determined to be 3.66gâ
kg-1BW.75â
d-1. When daily apparent digestible nitrogen intakes were below the pigs\u27 determined need, the amount of digestible N (mgâ
kg-1BW.75â
d-1) lost for body maintenance processes was estimated as .239 in urine and .080 in feces. The amount lost in urine as unusable for body N accretion was .206 gâ
kg-1BW.75â
d-1 of each gram of digestible N consumed above body maintenance needs. When daily apparent digestible N intakes were above the pigs determined need, .900 g of each gram of additional N consumed above that needed for body N accretion was excreted. The minimum biological capacity for N excretion in pigs, defined as total (urinary plus fecal) obligatory losses of N, is estimated to be .287gâ
kg-1BW.75â
d-1 to support pigs at N maintenance and 1.11 gâ
kg-1BW.75â
d-1 for pigs at maximum body N accretion.
Using these estimates, the minimal biological capacity for N excretion can be calculated for pigs at various stages of growth. For example, in 60 kg pigs, minimum capacity for N excretion is estimated at .10 and .39 g/kg body weight/day in pigs in states of N maintenance and maximum body N accretion, respectively. These values are 12 and 44%, respectively, of N excretion relative to published standards (ASAE D384.1). Similarly, the N content of excreta from animals excreting N at their biological minimum was determined to be 2.57 g N/liter, or 18% of standard excreta N content (corrected for volatilization, ASAE D384.1). Based on these data, the minimum biological capacity for the excretion of N in pigs is substantially less than current estimates of N excretion and can be achieved by eliminating dietary factors that contribute to N excretion. Furthermore, dietary regimens that allow the minimum biological capacity for N excretion to be achieved are biologically capable of supporting maximum rates of body accretion (i.e., lean tissue growth) in pigs
A Global Plate Model Including Lithospheric Deformation Along Major Rifts and Orogens Since the Triassic
Global deepâtime plate motion models have traditionally followed a classical rigid plate approach, even though plate deformation is known to be significant. Here we present a global MesozoicâCenozoic deforming plate motion model that captures the progressive extension of all continental margins since the initiation of rifting within Pangea at ~240 Ma. The model also includes major failed continental rifts and compressional deformation along collision zones. The outlines and timing of regional deformation episodes are reconstructed from a wealth of published regional tectonic models and associated geological and geophysical data. We reconstruct absolute plate motions in a mantle reference frame with a joint global inversion using hot spot tracks for the last 80 million years and minimizing global trench migration velocities and net lithospheric rotation. In our optimized model, net rotation is consistently below 0.2°/Myr, and trench migration scatter is substantially reduced. Distributed plate deformation reaches a Mesozoic peak of 30 Ă 106 km2 in the Late Jurassic (~160â155 Ma), driven by a vast network of rift systems. After a midâCretaceous drop in deformation, it reaches a high of 48 x 106 km2 in the Late Eocene (~35 Ma), driven by the progressive growth of plate collisions and the formation of new rift systems. About a third of the continental crustal area has been deformed since 240 Ma, partitioned roughly into 65% extension and 35% compression. This community plate model provides a framework for building detailed regional deforming plate networks and form a constraint for models of basin evolution and the plateâmantle system
CcNav: Understanding Compiler Optimizations in Binary Code
Program developers spend significant time on optimizing and tuning programs.
During this iterative process, they apply optimizations, analyze the resulting
code, and modify the compilation until they are satisfied. Understanding what
the compiler did with the code is crucial to this process but is very
time-consuming and labor-intensive. Users need to navigate through thousands of
lines of binary code and correlate it to source code concepts to understand the
results of the compilation and to identify optimizations. We present a design
study in collaboration with program developers and performance analysts. Our
collaborators work with various artifacts related to the program such as binary
code, source code, control flow graphs, and call graphs. Through interviews,
feedback, and pair-analytics sessions, we analyzed their tasks and workflow.
Based on this task analysis and through a human-centric design process, we
designed a visual analytics system Compilation Navigator (CcNav) to aid
exploration of the effects of compiler optimizations on the program. CcNav
provides a streamlined workflow and a unified context that integrates disparate
artifacts. CcNav supports consistent interactions across all the artifacts
making it easy to correlate binary code with source code concepts. CcNav
enables users to navigate and filter large binary code to identify and
summarize optimizations such as inlining, vectorization, loop unrolling, and
code hoisting. We evaluate CcNav through guided sessions and semi-structured
interviews. We reflect on our design process, particularly the immersive
elements, and on the transferability of design studies through our experience
with a previous design study on program analysis.Comment: IEEE VIS VAST 202
Taille de la population dâAvahi laniger dans la rĂ©serve dâAmbodiriana-Manompana, Nord-est de Madagascar
Avahi laniger est le seul lĂ©murien nocturne appartenant Ă la famille des Indriidae qui habite les forĂȘts humides de lâest de Madagascar (Mittermeier et. al., 2010) dont une partie disparaĂźt chaque annĂ©e (exploitation du bois, pratique du «tavy» ou culture sur brĂ»lis) (Beaucent and Fayolle, 2011; Lehman and Wright, 2000). La fragmentation et la destruction de leur habitat ainsi que la chasse menacent la survie de
nombreuses espĂšces de lĂ©muriens incluant celle de A. laniger (Jenkins et. al., 2011; Rakotondravony and Rabenandrasana, 2011; Anderson, Rowcliffe and Cowlishaw, 2007). Nous avons rĂ©alisĂ©, entre fin Avril et Mai 2012, une Ă©tude de densitĂ© de la population de A. laniger au sein de lâaire protĂ©gĂ©e de Manompana-Ambodiriana afin dâestimer la taille de la population totale et de dĂ©terminer lâimpact du projet de conservation menĂ©e par lâAssociation de DĂ©fense de la ForĂȘt dâAmbodiriana (ADEFA) qui recherche lâĂ©volution dĂ©mographique Ă moyen terme de cette espĂšce."LABEX" TULIP: (ANR-10-LABX-41), fct fellowship: (SFRH/BD/64875/2009)
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