3,119 research outputs found
A Computerized Mapping System for Forest Resource Management Planning
Large volumes of inventory data are collected and analyzed with the idea of developing resource management schemes for the future. Unless this inventory information is easily accessible, is of the type needed to make management decisions in accordance with current policy, and has a readily available updating system, the entire management plan often becomes a seldom, if ever, used document.
This study deals with the application of several inventory collection and display techniques to assist in making rapid and accurate resource management decisions on a continuing basis. The objective of the study is to develop a comprehensive forest resource management plan for the U.S. Department of the Army, Corps of Engineers Philpott Reservoir Complex located on the Piedmont geomorphic province near Bassett, Virginia. Specifically the management plan is focused on increasing the value of the lands primarily for recreation and wildlife with the inclusion of other compatible uses where appropriate. A healthy and vigorous forest system is required in order to withstand the stresses imposed by man and nature. Therefore, a forest complex capable of supporting the planned recreation, wildlife, scenic attractiveness and other project uses must be maintained so as to yield the maximum social benefit and insure the ecologic integrity of the system
Congenital pseudarthrosis of the tibia : treatment with free vascularised fibular grafts
CITATION: Smith, C. S. F., Zeeman, V. R. B. J. & Wade, W. J. 1993. Congenital pseudarthrosis of the tibia : treatment with free vascularised fibular grafts. South African Medical Journal, 83:750-752.The original publication is available at http://www.samj.org.zaCongenital pseudarthrosis is uncommon. We report on a series of 4 patients treated by means of free vascularised fibular grafts. Complications encountered were graft fracture, delayed union and angulation deformities. Modifications in the surgical technique improved later results. We recommend wide excision of pathological bone, bridging of the defect by free vascularised fibular grafts and rigid fixation.Publisher’s versio
The magnetic Bp star 36 Lyncis, I. Magnetic and photospheric properties
This paper reports the photospheric, magnetic and circumstellar gas
characteristics of the magnetic B8p star 36 Lyncis (HD 79158). Using archival
data and new polarised and unpolarised high-resolution spectra, we redetermine
the basic physical properties, the rotational period and the geometry of the
magnetic field, and the photospheric abundances of various elements.}{Based on
magnetic and spectroscopic measurements, we infer an improved rotational period
of d. We determine a current epoch of the longitudinal
magnetic field positive extremum (HJD 2452246.033), and provide constraints on
the geometry of the dipole magnetic field (i\geq 56\degr, G, unconstrained). We redetermine the effective
temperature and surface gravity using the optical and UV energy distributions,
optical photometry and Balmer line profiles ( K,
), and based on the Hipparcos parallax we redetermine the
luminosity, mass, radius and true rotational speed ( \kms). We
measure photospheric abundances for 21 elements using optical and UV spectra,
and constrain the presence of vertical stratification of these elements. We
perform preliminary Doppler Imaging of the surface distribution of Fe, finding
that Fe is distributed in a patchy belt near the rotational equator. Most
remarkably, we confirm strong variations of the H line core which we
interpret as due to occultations of the star by magnetically-confined
circumstellar gas.Comment: Accepted by Astronomy and Astrophysic
Revisiting the Rigidly Rotating Magnetosphere model for sigma Ori E. I. Observations and Data Analysis
We have obtained 18 new high-resolution spectropolarimetric observations of
the B2Vp star sigma Ori E with both the Narval and ESPaDOnS
spectropolarimeters. The aim of these observations is to test, with modern
data, the assumptions of the Rigidly Rotating Magnetosphere (RRM) model of
Townsend & Owocki (2005), applied to the specific case of sigma Ori E by
Townsend et al. (2005). This model includes a substantially offset dipole
magnetic field configuration, and approximately reproduces previous
observational variations in longitudinal field strength, photometric
brightness, and Halpha emission. We analyze new spectroscopy, including H I, He
I, C II, Si III and Fe III lines, confirming the diversity of variability in
photospheric lines, as well as the double S-wave variation of circumstellar
hydrogen. Using the multiline analysis method of Least-Squares Deconvolution
(LSD), new, more precise longitudinal magnetic field measurements reveal a
substantial variance between the shapes of the observed and RRM model
time-varying field. The phase resolved Stokes V profiles of He I 5876 A and
6678 A lines are fit poorly by synthetic profiles computed from the magnetic
topology assumed by Townsend et al. (2005). These results challenge the offset
dipole field configuration assumed in the application of the RRM model to sigma
Ori E, and indicate that future models of its magnetic field should also
include complex, higher-order components.Comment: 13 pages, 8 figures. Accepted for publication in MNRA
No detection of large-scale magnetic fields at the surfaces of Am and HgMn stars
We investigate the magnetic dichotomy between Ap/Bp and other A-type stars by
carrying out a deep spectropolarimetric study of Am and HgMn stars. Using the
NARVAL spectropolarimeter at the Telescope Bernard Lyot (Observatoire du Pic du
Midi, France), we obtained high-resolution circular polarisation spectroscopy
of 12 Am stars and 3 HgMn stars. Using Least Squares Deconvolution (LSD), no
magnetic field is detected in any of the 15 observed stars. Uncertaintiies as
low as 0.3 G (respectively 1 G) have been reached for surface-averaged
longitudinal magnetic field measurements for Am (respectively HgMn) stars.
Associated with the results obtained previously for Ap/Bp stars, our study
confirms the existence of a magnetic dichotomy among A-type stars. Our data
demonstrate that there is at least one order of magnitude difference in field
strength between Zeeman detected stars (Ap/Bp stars) and non Zeeman detected
stars (Am and HgMn stars). This result confirms that the
spectroscopically-defined Ap/Bp stars are the only A-type stars harbouring
detectable large-scale surface magnetic fields.Comment: 6 pages, 3 figures, accepted for publication in A&
NGC 1624-2: A slowly rotating, X-ray luminous Of?cp star with an extraordinarily strong magnetic field
This paper presents a first observational investigation of the faint Of?cp
star NGC 1624-2, yielding important new constraints on its spectral and
physical characteristics, rotation, magnetic field strength, X-ray emission and
magnetospheric properties. Modeling the spectrum and spectral energy
distribution, we conclude that NGC 1624-2 is a main sequence star of mass M
{\simeq} 30 M{\odot}, and infer an effective temperature of 35 {\pm} 2 kK and
log g = 4.0 {\pm} 0.2. Based on an extensive time series of optical spectral
observations we report significant variability of a large number of spectral
lines, and infer a unique period of 157.99 {\pm} 0.94 d which we interpret as
the rotational period of the star. We report the detection of a very strong -
5.35 {\pm} 0.5 kG - longitudinal magnetic field , coupled with probable
Zeeman splitting of Stokes I profiles of metal lines confirming a surface field
modulus of 14 {\pm} 1 kG, consistent with a surface dipole of polar
strength >~ 20 kG. This is the largest magnetic field ever detected in an
O-type star, and the first report of Zeeman splitting of Stokes I profiles in
such an object. We also report the detection of reversed Stokes V profiles
associated with weak, high-excitation emission lines of O iii, which we propose
may form in the close magnetosphere of the star. We analyze archival Chandra
ACIS-I X-ray data, inferring a very hard spectrum with an X-ray efficiency log
Lx/Lbol = -6.4, a factor of 4 larger than the canonical value for O-type stars
and comparable to that of the young magnetic O-type star {\theta}1 Ori C and
other Of?p stars. Finally, we examine the probable magnetospheric properties of
the star, reporting in particular very strong magnetic confinement of the
stellar wind, with {\eta}* {\simeq} 1.5 {\times} 10^4, and a very large Alfven
radius, RAlf = 11.4 R*.Comment: 17 pages, MNRAS accepted and in pres
Model Based Definition: Finally, the Engineering Drawing Killer?
The Engineering drawing has stood as the universal method of translating design intent since the first standard was formalized in 1927 as BS308. Further development of national and international standards has been informed by advances in CADCAM technology and the need for transfer of complex yet unambiguous definition between organisations. The emergence of model based definition (MBD) has driven a new workflow where the engineering drawing is no longer required. Instead, the dataset includes semantic, machine readable, tolerancing of surfaces and features for integration into manufacturing and metrology procedures. Despite the advantages of MBD, it has been largely ignored in UK Higher Education. However MBD is the ideal method for teaching and learning geometrical tolerancing since it ignores the theoretically exact dimensions and housekeeping, concentrating on the functional limits. Further, it utilises the 3D workspace that students are increasingly familiar with
Determination of the basic parameters of the dwarf nova EY Cygni
High-dispersion spectroscopy of EY Cyg obtained from data spanning twelve
years show, for the first time, the radial velocity curves from both emission
and absorption line systems, yielding semi-amplitudes K_{em}=24+/- 4 km s^-1
and K_{abs}=54+/- 2 km s^-1. The orbital period of this system is found to be
0.4593249(1)d. The masses of the stars, their mass ratio and their separation
are found to be M_1 sin^3 i = 0.015+/-0.002 M_sun, M_2 sin^3 i = 0.007+/-0.002
M_sun, q = K_1/K_2 = M_2/M_1 = 0.44+/-0.02 and a sin i = 0.71+/-0.04 R_sun. We
also found that the spectral type of the secondary star is around K0,consistent
with an early determination by Kraft(1962). From the spectral type of the
secondary star and simple comparisons with single main sequence stars, we
conclude that the radius of the secondary star is about 30 per cent larger than
a main sequence star of the same mass. We also present VRI CCD photometric
observations, some of them simultaneous with the spectroscopic runs. The
photometric data shows several light modulations, including a sinusoidal
behaviour with twice the frequency of the orbital period, characteristic of the
modulation coming from an elongated, irradiated secondary star. Low and high
states during quiescence are also detected and discussed. From several
constrains, we obtain tight limits for the inclination angle of the binary
system between 13 and 15 degrees, with a best value of 14 degrees obtained from
the sinusoidal light curve analysis. From the above results we derive masses
M_1 = 1.10+/-0.09 M_sun, M_2 = 0.49+/-0.09 M_sun, and a binary separation a =
2.9+/- 0.1 R_sun.Comment: 14 pages, 14 figures, accepted for publication on A&
Trends in gastroenteritis-associated mortality in the United States, 1985–2005: variations by ICD-9 and ICD-10 codes
Abstract Background Trends in gastroenteritis-associated mortality are changing over time with development of antibiotic resistant strains of certain pathogens, improved diagnostic methods, and changing healthcare. In 1999, ICD-10 coding was introduced for mortality records which can also affect trends. We assess trends in gastroenteritis-associated mortality and changes associated with coding. Methods Trends in gastroenteritis-associated mortality rates in the United States were examined using the National Center for Health Statistics Multiple Cause-of-Death Mortality databases for 1985–2005. All deaths with the underlying cause or any contributing cause included gastroenteritis were included. Cases were selected based on ICD9 (pre-1999) and ICD10 (1999–2005) codes and all analyses were stratified by ICD usage. Annual trends in age adjusted mortality rates were assessed using linear regression spline analysis. Relative risks and 95% confidence intervals (CIs) were calculated using Poisson regression adjusted for age group, sex, race, and region. Results There were a total of 190,674 deaths related to gastroenteritis in the U.S. from 1985–2005 with an average of 9,080 per year. During this time the percent of deaths related to gastroenteritis more than tripled, increasing from 0.25% to 0.80% of all deaths. Though the time periods varied in length, we demonstrate a significant increase in slope from a 0.0054% annual increase during the period 1985–1998, when ICD-9 coding was used, to a 0.0550% annual increase during 1999–2005, when ICD-10 coding was used. For both time periods, the oldest age group (75+ years) demonstrated the highest risk of death due to gastroenteritis. Additionally, males demonstrated higher risk than females and blacks were at higher risk than whites for death due to gastroenteritis. Conclusions This analysis demonstrates the public health burden of gastroenteritis-associated mortality in the United States and changes in trends due to change from ICD-9 to ICD-10 coding. The overall rate of gastroenteritis-associated mortality has more than tripled over the 21-year period from 1985 to 2005 and the primary burden of deaths due to gastroenteritis is in the elderly population
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