74 research outputs found
Research Project No. 8, Estimating the Cubic Foot Volume of Individual Slash Pine Trees Planted in East Texas
Equations are presented to estimate the cubic foot content of the wood and berk in tile stern and branches of individual slash pine trees Planted on site-prepared land in East Texas. Taper functions are also developed
Fusiform Rust Trends in East Texas: 1969-1987
Five surveys of pine plantations in East Texas over an 18-year period (1969-1987) indicated that fusiform rust (Cronartium quercuum [Berk.] Miyabe ex Shirai f. sp. fusiforme Birdsall and Snow) infection rates have increased to current levels of about 50% on slash pine (Pinus elliottii Engelm.) and are continuing to increase on loblolly pine (Pinus taeda L.) to 10-15% levels. South. J. Appl. For. 12(4):259-26
Research Report No. 22, A Computer Program in Basic for Estimating Yield of East Texas Pine Plantations
A computer program for estimating per acre yield for lob lolly and slash pine plantations in East Texas ls presented. The program, DIADISD.BAS, ls written in BASIC and is designed to run on IBM (and compatible) PC computers. An option in DIADISD.BAS allows the user to impose mortality rates on the pine plantations for both fusiform rust infected tree stems Md disease-free stems
Research Report No. 19, Estimating Survival for East Texas Pine Plantations
Equations to estimate the expected number of trees per acre at future points within a rotation are presented for planted lob lolly pine ( Pinus taeda L. ) and slash pine ( Pinus elliottii Engelm ) trees on non-old-fields in East Texas. Separate functions are presented for fusiform rust infected trees and uninfected trees
Research Report No. 18, Fusiform Rust Occurrence in East Texas Pine Plantations, 1969-1987
Information from five surveys of slash pine ( Pinus ellioitti Engelm. ) and loblolly ( Pinus taeda L. ) pine plantations in East Texas between 1969 and 1987 indicated that infection rates for fusiform rust ( Cranatlium quercuum (Berle) Miyabe ex Shirai f. sp. fusiforme) have increased to about 50~ for slash pine and are continuing to increase for loblolly pine to current levels of 10- I 5:t
Tree Content and Taper Functions for Loblolly and Slash Pine Trees Planted on Non-Old-Fields in East Texas
Equations are presented to estimate total or partial stem content in cubic feet and pounds (green or dry) for loblolly pine (Pinus taeda L.) and slash pine (Pinus elliotti Engelm.) trees planted on non-old-fields in East Texas. Equations are included to estimate the content of the complete tree (stem and branches). In addition, a set of compatible stem taper functions are described. South. j. Appl. For. 11(3):147-15
Prospectus, April 26, 1977
VOTE TODAY-TOMORROW: FOUR VIE FOR PRES. IN STU-GO ELECTION; Remus, Mayeda run for V.P.; Albert Dodson unopposed; Activities Day May 3; Letters to the editor: Pres. Praises carnival, Mayeda warns of lies, Cartoon good…but, Stu-Go made many contributions: Onley; Editorial: Trouble for athletics; Hackett vs. Slack for convo., Cox opposes Stoeber for IOC; Unopposed: Propeck runs alone for secretary; Thursday set for wheel chair awareness; State provides funding for food sanitation course; Law Enforcement Club sponsors Mk\u27t Place fair; Markland: bigger not better for Twin City police force; Energy saving tips: Ripple effect causes waste; Police Chief Dye: \u27Recruitment-lifeline of police dep\u27t.\u27; Bike race today; Blooming Idiots come out of woodwork for IOC Carnival; Workshop set for Saturday: Puppetmaster Schmidt displays at PC; Afro American Theatre Workshop starts at PC; \u27Alcohol, sophisticated, sexy?\u27; Bike tour Sunday, May 1; Classifieds; Bat girls provide needed help for baseball team; Cobras expand record with 3rd no-hitter; Lincolnland doubleheader tomorrow: Women\u27s softball season nears end; June 7-10: Mudrock headed to JC golf nationalshttps://spark.parkland.edu/prospectus_1977/1018/thumbnail.jp
Pervasiveness of Parasites in Pollinators
Many pollinator populations are declining, with large economic and ecological
implications. Parasites are known to be an important factor in the some of the
population declines of honey bees and bumblebees, but little is known about the
parasites afflicting most other pollinators, or the extent of interspecific
transmission or vectoring of parasites. Here we carry out a preliminary
screening of pollinators (honey bees, five species of bumblebee, three species
of wasp, four species of hoverfly and three genera of other bees) in the UK for
parasites. We used molecular methods to screen for six honey bee viruses,
Ascosphaera fungi, Microsporidia, and
Wolbachia intracellular bacteria. We aimed simply to detect
the presence of the parasites, encompassing vectoring as well as actual
infections. Many pollinators of all types were positive for
Ascosphaera fungi, while Microsporidia were rarer, being
most frequently found in bumblebees. We also detected that most pollinators were
positive for Wolbachia, most probably indicating infection with
this intracellular symbiont, and raising the possibility that it may be an
important factor in influencing host sex ratios or fitness in a diversity of
pollinators. Importantly, we found that about a third of bumblebees
(Bombus pascuorum and Bombus terrestris)
and a third of wasps (Vespula vulgaris), as well as all honey
bees, were positive for deformed wing virus, but that this virus was not present
in other pollinators. Deformed wing virus therefore does not appear to be a
general parasite of pollinators, but does interact significantly with at least
three species of bumblebee and wasp. Further work is needed to establish the
identity of some of the parasites, their spatiotemporal variation, and whether
they are infecting the various pollinator species or being vectored. However,
these results provide a first insight into the diversity, and potential
exchange, of parasites in pollinator communities
Aerodynamic Optimisation of Non-planar Lifting Surfaces
A novel population structured genetic algorithm (sGA) with embedded potential flow
vortex ring panel method (VRM) has been developed to minimise induced and parasitic
drag subject to constraints on lift, root bending moment, and longitudinal static stability.
The optimisation architecture can activate up to four independent wing segments allowing
up to 28 design variables. Minimum drag of wing tip extensions and winglet configurations
are compared using the non-linear stochastic optimisation method. The optimiser identified
joined box wings as offering the greatest induced efficiency followed by C-wings. With span
and root bending moment constraints winglets offered best total drag reduction. C-wings
are further investigated for potential to enhance longitudinal static stability performance
by staggering the horizontal extension of the winglet to balance moments around the wing’s
centre of gravity. Preliminary results suggest that while longitudinal static stability can be
reached it would be very poor. Inclusion of more design constraints and additional analysis
of the structural dynamics of C-wings, especially effecting the torsional mode, is necessary
Self-Regulation and Social Welfare: The Political Economy of Corporate Environmentalism
- …