374 research outputs found
Wildlife management guide for the Chuck Swan Wildlife Management Area
The purpose of this management guide was to point out management techniques applicable to the wildlife species found on the Chuck Swan Wildlife Management Area, Union and Campbell counties, Tennessee. These techniques were discussed in two ways. First, programs designed for individual species were reviewed to allow those in charge of the administration of the area the opportunity to consider specific manage-ment programs for one or more of the game species inhabiting the area. The second approach involved the review of habitat management techniques without mentioning particular game species. The information presented originated from three sources. Published literature was reviewed to locate applicable management techniques for the game species hunted on the area. Published and unpublished data on file in the offices of the Tennessee Game and Fish Commission were reviewed to determine past and present programs. The third source of information was based on the experiences of the author on the area while employed by the Commission as a game biologist. Results of these reviews indicated that more wildlife-oriented management can be performed on the management area than is now being done. This management improvement involves smaller and more scattered timber sales while employing a more varied program of timber management to increase yields of timber and wildlife. The agricultural program should also be altered to include the development of non-agricultural crops. The distribution of the openings should also involve a more random and scattered pattern. Opportunities are available for developing complementary recrea-tional outlets on the management area. Such areas include picnicking and camping areas, caves, and historical sites consisting of remains of early settlements. Trails, helpful in providing hunter access into the more remote areas, can also provide access into and from these potential visitor-use centers. These developments are secondary to the primary use of the area- wildlife management and associated wildlife recreational activities such as photography, nature study, and hunting. Because of the possibility of conflicts between the management programs of wildlife and forestry management, there is an important need for frequent meetings between the Game and Fish Commission and the Division of Forestry to discuss management programs. During these meet-ings, programs can be explained and evaluated in order to gain the most advantage of each program for the agencies involved
Dynamic Determination of the Air Content in High Pressure Fluid Systems Through Sonic Velocity Measurement
Mechanical Engineerin
Internet Predictions
More than a dozen leading experts give their opinions on where the Internet is headed and where it will be in the next decade in terms of technology, policy, and applications. They cover topics ranging from the Internet of Things to climate change to the digital storage of the future. A summary of the articles is available in the Web extras section
Improving regional ozone modeling through systematic evaluation of errors using the aircraft observations during the International Consortium for Atmospheric Research on Transport and Transformation
During the operational phase of the ICARTT field experiment in 2004, the regional air quality model STEM showed a strong positive surface bias and a negative upper troposphere bias (compared to observed DC-8 and WP-3 observations) with respect to ozone. After updating emissions from NEI 1999 to NEI 2001 (with a 2004 large point sources inventory update), and modifying boundary conditions, low-level model bias decreases from 11.21 to 1.45 ppbv for the NASA DC-8 observations and from 8.26 to −0.34 for the NOAA WP-3. Improvements in boundary conditions provided by global models decrease the upper troposphere negative ozone bias, while accounting for biomass burning emissions improved model performance for CO. The covariances of ozone bias were highly correlated to NOz, NOy, and HNO3 biases. Interpolation of bias information through kriging showed that decreasing emissions in SE United States would reduce regional ozone model bias and improve model correlation coefficients. The spatial distribution of forecast errors was analyzed using kriging, which identified distinct features, which when compared to errors in postanalysis simulations, helped document improvements. Changes in dry deposition to crops were shown to reduce substantially high bias in the forecasts in the Midwest, while updated emissions were shown to account for decreases in bias in the eastern United States. Observed and modeled ozone production efficiencies for the DC-8 were calculated and shown to be very similar (7.8) suggesting that recurring ozone bias is due to overestimation of NOx emissions. Sensitivity studies showed that ozone formation in the United States is most sensitive to NOx emissions, followed by VOCs and CO. PAN as a reservoir of NOx can contribute to a significant amount of surface ozone through thermal decomposition
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Analysis Methods for Milky Way Dark Matter Satellite Detection
The Gamma Ray Large Area Space Telescope (GLAST) Large Area Telescope (LAT) Dark Matter and New Physics Working group has been developing approaches for the indirect detection of in situ annihilation of dark matter. Our work has assumed that a significant component of dark matter is a new type of Weakly Interacting Massive Particle (WIMP) in the 100GeV mass range. The annihilation of two WIMPs results in the production of a large number of high energy gamma rays (>1GeV) that can be well measured by the GLAST LAT. The cold dark matter model implies a significant number of as yet unobserved dark matter satellites in our galaxy. The spectra of these galactic satellites are considerably harder than most, if not all, astrophysical sources, have an endpoint at the mass of the WIMP, and are not power laws. We describe a preliminary feasibility study for the indirect detection of dark matter satellites in the Milky Way using the GLAST LAT
Main-Belt Comet P/2012 T1 (PANSTARRS)
We present initial results from observations and numerical analyses aimed at
characterizing main-belt comet P/2012 T1 (PANSTARRS). Optical monitoring
observations were made between October 2012 and February 2013 using the
University of Hawaii 2.2 m telescope, the Keck I telescope, the Baade and Clay
Magellan telescopes, Faulkes Telescope South, the Perkins Telescope at Lowell
Observatory, and the Southern Astrophysical Research (SOAR) telescope. The
object's intrinsic brightness approximately doubles from the time of its
discovery in early October until mid-November and then decreases by ~60%
between late December and early February, similar to photometric behavior
exhibited by several other main-belt comets and unlike that exhibited by
disrupted asteroid (596) Scheila. We also used Keck to conduct spectroscopic
searches for CN emission as well as absorption at 0.7 microns that could
indicate the presence of hydrated minerals, finding an upper limit CN
production rate of QCN<1.5x10^23 mol/s, from which we infer a water production
rate of QH2O<5x10^25 mol/s, and no evidence of the presence of hydrated
minerals. Numerical simulations indicate that P/2012 T1 is largely dynamically
stable for >100 Myr and is unlikely to be a recently implanted interloper from
the outer solar system, while a search for potential asteroid family
associations reveal that it is dynamically linked to the ~155 Myr-old Lixiaohua
asteroid family.Comment: 15 pages, 4 figures, accepted for publication in ApJ Letter
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