699 research outputs found
Second Report on a Forest Survey of Illinois. The Economics of Forestry in the State
A forest survey of Illinois was begun by the State Natural History Survey in July, 1919 when Mr. R. B. Miller was engaged for a preliminary general study of the Illinois situation and conditions and for educational and publicity work intended to open the way to active, practical studies on a larger scale. In 1921 three additional foresters, with Mr. C. J. Telford in charge, entered upon a systematic survey of Illinois woodlands with a view to their location and area, their composition and condition, their present management and utilization, and their productivity as shown by the rates of growth of important kinds of trees on various soils, in various situations, under various conditions, and in all parts of the state.published or submitted for publicationis peer reviewe
Is bigger better? The relationship between size and reproduction in female Asian elephants
The limited availability of resources is predicted to impose trade-offs
between growth, reproduction and self-maintenance in animals. However,
although some studies have shown that early reproduction suppresses
growth, reproduction positively correlates with size in others. We use
detailed records from a large population of semi-captive elephants in
Myanmar to assess the relationships between size (height and weight),
reproduction and survival in female Asian elephants, a species
characterized by slow, costly life history. Although female height gain
during the growth period overlapped little with reproductive onset in
the population, there was large variation in age at first reproduction
and only 81% of final weight had been reached by peak age of
reproduction at the population level (19 years). Those females beginning
reproduction early tended to be taller and lighter later in life,
although these trends were not significant. We found that taller females
were more likely to have reproduced by a given age, but such effects
diminished with age, suggesting there may be a size threshold to
reproduction which is especially important in young females. Because
size was not linked with female survival during reproductive ages, the
diminishing effect of height on reproduction with age is unlikely to be
due to biased survival of larger females. We conclude that although
reproduction may not always impose significant costs on growth, height
may be a limiting factor to reproduction in young female Asian
elephants, which could have important implications considering their
birth rates are low and peak reproduction is young – 19 years in this
population. © 2017 European Society For Evolutionary Biology. Journal of
Evolutionary Biology © 2017 European Society For Evolutionary Biology</p
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Technology and Discourse: A Comparison of Face-to-face and Telephone Employment Interviews
Very little research has investigated the comparability of telephone and face-to-face employment interviews. This exploratory study investigated interviewers' questioning strategies and applicants' causal attributions produced during semi structured telephone and face-to-face graduate recruitment interviews (N=62). A total of 2044 causal attributions were extracted from verbatim transcripts of these 62 interviews. It was predicted that an absence of visual cues would lead applicants to produce, and interviewers to focus on, information that might reduce the comparative anonymity of telephone interviews. Results indicate that applicants produce more personal causal attributions in telephone interviews. Personal attributions are also associated with higher ratings in telephone, but not face-to-face interviews. In face-to-face interviews, applicants who attributed outcomes to more global causes received lower ratings. There was also a non-significant tendency for interviewers to ask more closed questions in telephone interviews. The implications of these findings for research and practice are discussed
Moon Shadow by Cosmic Rays under the Influence of Geomagnetic Field and Search for Antiprotons at Multi-TeV Energies
We have observed the shadowing of galactic cosmic ray flux in the direction
of the moon, the so-called moon shadow, using the Tibet-III air shower array
operating at Yangbajing (4300 m a.s.l.) in Tibet since 1999. Almost all cosmic
rays are positively charged; for that reason, they are bent by the geomagnetic
field, thereby shifting the moon shadow westward. The cosmic rays will also
produce an additional shadow in the eastward direction of the moon if cosmic
rays contain negatively charged particles, such as antiprotons, with some
fraction. We selected 1.5 x10^{10} air shower events with energy beyond about 3
TeV from the dataset observed by the Tibet-III air shower array and detected
the moon shadow at level. The center of the moon was detected
in the direction away from the apparent center of the moon by 0.23 to
the west. Based on these data and a full Monte Carlo simulation, we searched
for the existence of the shadow produced by antiprotons at the multi-TeV energy
region. No evidence of the existence of antiprotons was found in this energy
region. We obtained the 90% confidence level upper limit of the flux ratio of
antiprotons to protons as 7% at multi-TeV energies.Comment: 13pages,4figures; Accepted for publication in Astroparticle Physic
The Kuiper Belt and Other Debris Disks
We discuss the current knowledge of the Solar system, focusing on bodies in
the outer regions, on the information they provide concerning Solar system
formation, and on the possible relationships that may exist between our system
and the debris disks of other stars. Beyond the domains of the Terrestrial and
giant planets, the comets in the Kuiper belt and the Oort cloud preserve some
of our most pristine materials. The Kuiper belt, in particular, is a
collisional dust source and a scientific bridge to the dusty "debris disks"
observed around many nearby main-sequence stars. Study of the Solar system
provides a level of detail that we cannot discern in the distant disks while
observations of the disks may help to set the Solar system in proper context.Comment: 50 pages, 25 Figures. To appear in conference proceedings book
"Astrophysics in the Next Decade
Search for direct production of charginos and neutralinos in events with three leptons and missing transverse momentum in √s = 7 TeV pp collisions with the ATLAS detector
A search for the direct production of charginos and neutralinos in final states with three electrons or muons and missing transverse momentum is presented. The analysis is based on 4.7 fb−1 of proton–proton collision data delivered by the Large Hadron Collider and recorded with the ATLAS detector. Observations are consistent with Standard Model expectations in three signal regions that are either depleted or enriched in Z-boson decays. Upper limits at 95% confidence level are set in R-parity conserving phenomenological minimal supersymmetric models and in simplified models, significantly extending previous results
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