12,819 research outputs found
The Relationships Among Recruiter Characteristics and Pre-and Post-hire Recruitment Outcomes
Previous research on recruiter characteristics has generally focused on recruitment outcomes related to generating applicants and maintaining their interest. The current study expanded previous research by examining recruitment outcomes at pre- and post-hire stages of the recruitment process. These outcomes included time to fill position, job offer acceptance rate, job fit, job satisfaction, and retention. Findings indicate that recruiter conscientiousness compared to extraversion is most consistently associated with pre-hire outcomes such as time to fill position and accepting hiring recommendations. Conscientiousness was also related to note-taking in the interview. Recruiter informativeness and personableness were associated with hiring managers\u27 and new hiresâ satisfaction with the hiring process. Finally, recruiter informativeness was related to new hiresâ post-hire attitudes
Empirical Limits on Radial Velocity Planet Detection for Young Stars
We report initial results from our long term search using precision radial
velocities for planetary-mass companions located within a few AU of stars
younger than the Sun. Based on a sample of >150 stars, we define a floor in the
radial velocity scatter, sigma_RV, as a function of the chromospheric activity
level R'_{HK}. This lower bound to the jitter, which increases with increasing
stellar activity, sets the minimum planet mass that could be detected. Adopting
a median activity-age relationship reveals the astrophysical limits to planet
masses discernable via radial velocity monitoring, as a function of stellar
age. Considering solar-mass primaries having the mean jitter-activity level,
when they are younger than 100 / 300 / 1000 Myr, the stochastic jitter
component in radial velocity measurements restricts detectable companion masses
to > 0.3 / 0.2 / 0.1 M_Jupiter. These numbers require a large number -- several
tens -- of radial velocity observations taken over a time frame longer than the
orbital period. Lower companion mass limits can be achieved for stars with less
than the mean jitter and/or with an increased number of observations.Comment: 5 pages, to appear the 18th Cambridge Workshop on Cool Stars, Stellar
Systems, and the Sun proceedings edited by G. van Belle & H. Harri
An Evidence Based Protocol for the User of Mindfulness for Young Adults with Eating Disorders
The student researchers used evidence based literature as well as a professional opinion from a practicing CTRS to summarize how to run a successful mindfulness program for young adults with eating disorders
Age, growth, mortality, and radiometric age validation of gray snapper (Lutjanus griseus) from Louisiana
The gray snapper (Lutjanus griseus) is a temperate and tropical reef fish that is found along the Gulf of Mexico and Atlantic coasts of the southeastern United States. The recreational fishery for gray snapper has developed rapidly in south Louisiana with the advent of harvest and seasonal
restrictions on the established red snapper (L. campechanus) fishery. We examined the age and growth of
gray snapper in Louisiana with the use of cross-sectioned sagittae. A total of 833 specimens, (441 males, 387
females, and 5 of unknown sex) were opportunistically sampled from the recreational fishery from August 1998 to August 2002. Males ranged in size from 222 to 732 mm total length (TL) and from 280 g to 5700 g total weight (TW) and females ranged from 254 to 756 mm TL and from 340 g to 5800 g TW. Both edge analysis and bomb radiocarbon analyses were used to validate otolith-based age estimates. Ages were estimated for 718 individuals; both males and females ranged
from 1 to 28 years. The von Bertalanffy growth models derived from TL at age were Lt = 655.4{1âe[â0.23(t)]}
for males, Lt = 657.3{1âe[â 0.21(t)]} for females, and L t = 656.4{1âe[â 0.22 (t)]} for all specimens of known sex. Catch curves were used to produce a total mortality (Z) estimate of 0.17. Estimates of M calculated with various
methods ranged from 0.15 to 0.50; however we felt that M= 0.15 was the most appropriate estimate based on our estimate of Z. Full recruitment to the gray snapper recreational fishery began at age 4, was completed by age
8, and there was no discernible peak in the catch curve dome
Perturbations of Spatially Closed Bianchi III Spacetimes
Motivated by the recent interest in dynamical properties of topologically
nontrivial spacetimes, we study linear perturbations of spatially closed
Bianchi III vacuum spacetimes, whose spatial topology is the direct product of
a higher genus surface and the circle. We first develop necessary mode
functions, vectors, and tensors, and then perform separations of (perturbation)
variables. The perturbation equations decouple in a way that is similar to but
a generalization of those of the Regge--Wheeler spherically symmetric case. We
further achieve a decoupling of each set of perturbation equations into
gauge-dependent and independent parts, by which we obtain wave equations for
the gauge-invariant variables. We then discuss choices of gauge and stability
properties. Details of the compactification of Bianchi III manifolds and
spacetimes are presented in an appendix. In the other appendices we study
scalar field and electromagnetic equations on the same background to compare
asymptotic properties.Comment: 61 pages, 1 figure, final version with minor corrections, to appear
in Class. Quant. Gravi
Carbon and Oxygen in Nearby Stars: Keys to Protoplanetary Disk Chemistry
We present carbon and oxygen abundances for 941 FGK stars-the largest such
catalog to date. We find that planet-bearing systems are enriched in these
elements. We self-consistently measure C/O, which is thought to play a key role
in planet formation. We identify 46 stars with C/O \geq 1.00 as potential hosts
of carbon-dominated exoplanets. We measure a downward trend in [O/Fe] versus
[Fe/H] and find distinct trends in the thin and thick disks, supporting the
work of Bensby et al. Finally, we measure sub-solar C/O = 0.40+0.11 - 0.07, for
WASP-12, a surprising result as this star is host to a transiting hot Jupiter
whose dayside atmosphere was recently reported to have C/O \geq 1 by
Madhusudhan et al. Our measurements are based on 15,000 high signal-to-noise
spectra taken with the Keck 1 telescope as part of the California Planet
Search. We derive abundances from the [O I] and C I absorption lines at
{\lambda} = 6300 and 6587 {\AA} using the SME spectral synthesizer.Comment: 108 pages (including appendix), 16 figures, 6 table
Multi-isotopic (δ2H, δ13C, δ15N) tracing of molt origin for European starlings associated with U.S. dairies and feedlots
Introduced bird species can become invasive in agroecosystems and their management is inhibited if their origin and movements are not well understood. Stable isotope measurements of feathers can be used to infer molt origins and interstate movements in North America. We analyzed stable-hydrogen (δ2H), carbon (δ13C) and nitrogen (δ 15N) isotope ratios in feathers to better understand the molt origin of European starlings (Sturnus vulgaris) collected at dairies and feedlots throughout the United States. Primary feathers were used from 596 adult and 90 juvenile starlings collected during winter at dairies and feedlots that experience starling damages in Arizona, California, Colorado, Idaho, Illinois, Iowa, Kansas, Minnesota, Missouri, Nebraska, Nevada, New Hampshire, New Mexico, New York, North Carolina, Oregon, Texas, Vermont, Washington and Wisconsin. The best-fit model indicated that the combination of feather δ2H, δ13C and δ15N values best predicted the state where samples were collected and thus supported use of this approach for tracing molt origins in European starlings. Interestingly, molt origins of starlings collected at dairies and feedlots generally west of â90Ë longitude (i.e. 11 of 15 states west of the Mississippi River, including Wisconsin) were assigned to the collection state and/or the state adjacent to the collection state. In contrast, molt origins of starlings collected generally east of â90Ë longitude (four of five eastern states) were not assigned to the collection state and/or the state adjacent to the collection state. Among all starlings (N = 686), 23% were assigned to the collection state and 19% were assigned to the state adjacent to the collection state. Among all males (N = 489) and all females (N = 197), 23% and 26% were assigned to the collection state and 19% and 13% were assigned to the state adjacent to the collection state, respectively. We observed a greater proportion (88%) of juvenile starlings assigned to states other than their collection state (i.e. potentially a result of natal dispersal) than that proportion (76%) in adult starlings. This study included an unprecedented sample of feather isotopes from European starlings throughout the United States. As a novel contribution to the ecology and management of invasive and migratory passerines, we demonstrate how such feather isoscapes can be used to predict molt origin and, potentially, interstate movements of European starlings for subsequent ecological and management investigations
Spatial and depthâdependent variations in magma volume addition and addition rates to continental arcs: Application to global CO_2 fluxes since 750 Ma
Magma transfer from the mantle to the crust in arcs is an important step in the global cycling of elements and volatiles from Earth's interior to the atmosphere. Arc intrusive rocks dominate the total magma mass budget over extrusive rocks. However, their total volume and rate of addition is still poorly constrained, especially in continental arcs. We present lateral (forearc to backarc) and depthâdependent (volcanics to deep crust) magma volume additions and arcâwide magma addition rates (MARs) calculated from three continental arc crustal sections preserving magma flareâup periods. We observe an increase in volume addition with depth and less magma added in the forearc (~15%) and backarc (~10% to 30%) compared to the main arc. Crustalâwide MARs for each section are remarkably similar and around 0.7â0.9 km^3/km^2/Ma. MARs can be used to estimate CO_2 fluxes from continental arcs. With initial magma CO_2 contents of 1.5 wt.%, global continental arc lengths, and MARs, we calculate changes in C (Mt/year) released from continental arcs since 750 Ma. Calculated presentâday global C fluxes are similar to values constrained by other methods. Throughout the Phanerozoic, assuming equal durations of flareâup and lull magmatism, calculated continental CO_2 flux rates vary between 4 and 18 Mt C/year with highest values in the Mesozoic. These fluxes are considered minima since the intake of mantle and/or crustal carbon is not considered. Magmatic episodicity in continental arcs and changes in arc thickness and width are critical to consider when calculating MARs through time
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