19,841 research outputs found
Quartz (4 cm) - Bennett Q.
No full textQuartz (4 cm) - Bennett Q.https://digitalmaine.com/mgs_geologic_field_photos/6928/thumbnail.jp
Slide: Bennett, “Colt's Neck Hi-Rise Apartments, architectural elevation, color,” April 1974
No full textSlide: color, photograph, 2” x 2” (5.08 cm x 5.08 cm)Slide by Bennett entitled “Colt's Neck Hi-Rise Apartments, architectural elevation, color” dated April 1974. This is Bennett elevation’s of Colt’s Neck Apartments. These apartments are located in Reston, Virginia. This image shows the 13 stories of the apartment complex. Planned Community Archives Collection, 595.1
Smokey Quartz Crystal - Bennett Q. - 20 cm long.
No full textSmokey Quartz Crystal - Bennett Q. - 20 cm long.https://digitalmaine.com/mgs_geologic_field_photos/6927/thumbnail.jp
Cassiterite Crystal (12 x 6 cm overall) - Bennett Q. - Mined 1996
No full textCassiterite Crystal (12 x 6 cm overall) - Bennett Q. - Mined 1996https://digitalmaine.com/mgs_geologic_field_photos/6933/thumbnail.jp
Smokey Quartz Crystal (10 x 9 cm) - Bennett Q. - Donated to MGS.
No full textSmokey Quartz Crystal (10 x 9 cm) - Bennett Q. - Donated to MGS.https://digitalmaine.com/mgs_geologic_field_photos/6935/thumbnail.jp
Morganite Crystal (13 x 11 x 6.5 cm) - Bennett Q. - Found May 1993.
No full textMorganite Crystal (13 x 11 x 6.5 cm) - Bennett Q. - Found May 1993.https://digitalmaine.com/mgs_geologic_field_photos/6891/thumbnail.jp
High-resolution measurements of scattering in wheat canopies-implications for crop parameter retrieval
No full textPolarimetric X- and C-band measurements by the University of Sheffield ground-based synthetic aperture radar(GB-SAR)indoor system provide three-dimensional images of the scattering processes in wheat canopies, at resolutions of around a wavelength (3–6 cm). The scattering shows a pronounced layered structure, with strong returns from the soil and the flag leaves, and in some cases a second leaf layer. Differential attenuation at horizontal (H) and vertical (V) polarization, due to the predominantly vertical structure of the wheat stems, gives rise to marked effects. At both C and X bands, direct return from the canopy exceeds the soil return at large incidence angles for VV polarization, but is comparable to or less than the soil return in all other cases. At HV, the apparent ground return is probably due to a double-bounce mechanism, and volume scattering is never the dominant term. Direct sensing of the crop canopy is most effective at X band, VV, and large incidence angles, under which conditions the return is dominated by the flag leaf layer. Field measurements with the outdoor GB-SAR system suggest, however, that for sensitivity to biomass and reduced susceptibility to disturbances by rainfall, a two-channel C-band system operating at a medium range of incidence angles is preferred
Cowpox virus infection in natural field vole Microtus agrestispopulations: significant negative impacts on survival
No full text1. Cowpox virus is an endemic virus circulating in populations of wild rodents. It has been implicated as a potential cause of population cycles in field voles Microtus agrestis L., in Britain, owing to a delayed density-dependent pattern in prevalence, but its impact on field vole demographic parameters is unknown. This study tests the hypothesis that wild field voles infected with cowpox virus have a lower probability of survival than uninfected individuals. 2. The effect of cowpox virus infection on the probability of an individual surviving to the next month was investigated using longitudinal data collected over 2 years from four grassland sites in Kielder Forest, UK. This effect was also investigated at the population level, by examining whether infection prevalence explained temporal variation in survival rates, once other factors influencing survival had been controlled for. 3. Individuals with a probability of infection, P(I), of 1 at a time when base survival rate was at median levels had a 22.4% lower estimated probability of survival than uninfected individuals, whereas those with a P(I) of 0.5 had a 10.4% lower survival. 4. At the population level, survival rates also decreased with increasing cowpox prevalence, with lower survival rates in months of higher cowpox prevalence. 5. Simple matrix projection models with 28 day time steps and two stages, with 71% of voles experiencing cowpox infection in their second month of life (the average observed seroprevalence at the end of the breeding season) predict a reduction in 28-day population growth rate during the breeding season from λ = 1.62 to 1.53 for populations with no cowpox infection compared with infected populations. 6. This negative correlation between cowpox virus infection and field vole survival, with its potentially significant effect on population growth rate, is the first for an endemic pathogen in a cyclic population of wild rodents
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