150 research outputs found
Using a temporal symmetry model to assess population change and recruitment in the Preble's meadow jumping mouse (Zapus hudsonius preblei)
No full textThe Preble's meadow jumping mouse (Zapus hudsonius preblei [PMJM]) is a rare rodent of southeastern Wyoming and central Colorado that has been the center of debates regarding subspecies' genetic identity and the application of the Endangered Species Act. I analyzed a 7-year PMJM mark-recapture data set using a temporal symmetry model (Pradel model) to estimate apparent survival (u), recruitment ( f ), population change (k), and vital rate influence on k. Deer mouse (Peromyscus maniculatus) captures depressed u, suggesting that competition for resources may decrease PMJM survival. Vole-mediated habitat changes or voles' affinity for quality riparian habitats may explain why PMJM u and f increased with meadow vole (Microtus pennsylvanicus) captures. Based on early-summer and late-summer sampling from 2000 to 2006, k estimates were 0.87 6 0.06 SE and 0.87 6 0.11 SE, respectively, and f had a greater influence on k than did u. This PMJM population is losing connectivity to eastern, northern, and southern tributaries from habitat degradation and storm-water and municipal runoff erosion. The loss of the adjoining habitat and the PMJMs that were supported by this habitat prevents new recruitment via immigration. Because of the importance of recruitment to PMJM population stability, tributaries and the riparian habitat along these tributaries are vital to PMJM conservation. Scaleappropriate habitat sampling, assessments of reproductive success, and detailed demographic studies to estimate vital demographic parameters will help identify how particular habitat components impact fecundity and immigration
Thornbrough, Mary E. (Death, 1895-02-15)
No full textAddress: Kemper LaneAge at death: 52 yrs.Pg 17/1895/282/F W S/Ind./Dr. E. Schwab/C.M. Epply/New Paris, Preble, Co. OhioOriginal record filed in drawer labeled 'THOMPSON-TIMMERN'
Hersey Hall, Westbrook Junior College, 1951
No full textWestbrook Junior College\u27s Hersey Hall residents pose for their Tower yearbook photo in this 1951 black and white photograph by Jackson-White Studio, Portland, Maine.
Back row: B. Sherman, D. Smith, S. Herman, S. Haskins, P. Goodwin, M. Massey, N. Babson, P. Hitchcock, L. McCue. Third row: P. Richardson, B. Black, N. Jaegger, S. Bray, B. Walker, B. Bailey, P. Martin, B. Hessler, E. Gurwitz, D. Berry, C. McIntyre, B. Doliff, P. Thomas, P. Bean. Second row: N. Greenleaf, C. Preble, E. Forsberg, J. Tubman, J. Westaway, B. Haworth, K. Spry, J. Owen, B. May, A. Constantine, J. Corson, E. Bailey, S. Kruse. First row: A. Bridle, J. Smith, F. Bartlett, J. Mansfield, P. Rinderman, K. Connors, C. Perry, M. Rochford, J. Mulholland, J. Downton, B. Webber, K. Tsomides, P. Harrington, C. Breau.https://dune.une.edu/wchc_photos_students1950s/1114/thumbnail.jp
Landscape Structure and Nutrient Budgets in an Agricultural Watershed, Southwest, Ohio
No full textAuthor Institution: Department of Geography, Miami UniversityManaging for uncultivated lands in agricultural watersheds may be a cost effective way to improve surface water quality. For this study, landscape structure and nutrient (N, P) budgets were compared in seven first-order basins of Marshall's Branch watershed, Preble County, OH. Row crops were the dominant land use in all basins. Three basins had greater than 25% of stream buffers forested and nitrate concentrations below average. Four basins had higher pasture and residential land use proportions and phosphorus concentrations higher than average. Growing season precipitation in 1994 was low, resulting in low nutrient transport. Although no basins had net export of nutrients, trends exist that point out relationships between landscape structure and nutrient storage. Of particular importance is the strong effect small changes in forested stream buffers had on nitrogen flows in the basins, suggesting small land use changes in targeted areas can affect positive changes in basin-wide nutrient dynamics
Developing African art : innovation and tradition seen through the work of two artists; Lamidi Fakeye and Ahmed Shibrain
No full textThe dissertation explores the work of two African artists: Lamidi O.
Fakeye a Yoruba wood carver, and Ahmed M. Shibrain a Sudanese painter, as
an exemplary development within African art during the second half of the 20th
century. It examines their works through the sense of "tradition" as it is seen
within the context of their cultures and their histories. It considers their works to
be a reflection of their time, a hybrid art and a new tradition emerging within
their respective cultures as a result of change in their societies. It argues against
the notion that separates their art from their traditions and their histories based
on the artificial barriers of "authenticity" in the literature on African art and the
various categories that are related to it. It ponders on the contradictions and
complexity that this situation has created and demonstrated that these categories
negate historical realities.
The dissertation is in two parts. The first part describes and analyses
some of Lamidi's Christian and secular carvings. His work is placed in its
appropriate historical perspective by revealing its close relationship to the
carvings of his predecessors in terms of themes, design, content and clients.
Innovation and change in his work through time and space is revealed.
In the second part, the dissertation defines the connectivity of Shibrain's
work to his tradition and its history, and that of his fellow artists who
contributed to the development of a new trend in Sudanese art. It discusses their
work on the basis of the 'idea' of art in Islam, their training and their heritage of
decorative art and Arabic calligraphy. It argues that innovation, influence,
borrowing and adaptation, are part of progress in art through the ages
Indirect transitions of a signal interacting with a moving refractive index front
No full textThis research was supported by the German Research Foundation DFG (EI 391/12-2).The dynamic manipulation of light can be achieved by the interaction of a signal pulse propagating through or reflected from a refractive index front. Both the frequency and the wave vector of the signal are changed in this case, which is generally referred to as an indirect transition. We have developed a theory to describe such transitions in integrated photonic crystal waveguides. Through indirect transitions, the following effects can be envisaged: large frequency shifts and light stopping and order of magnitude pulse compression and broadening without center frequency shift. All effects can be potentially realized with a refractive index modulation as small as 0.001. For the experimental realization, we have used slow light photonic crystal waveguides in silicon. The refractive index front was obtained by free carriers generation with a switching pulse co-propagating with the signal in the same slow light waveguide. The group velocities of the signal and the front could be varied arbitrarily by choosing the right frequencies of the signal and switching pulses. The indirect transition was unambiguously demonstrated by considering two situations: a) the front overtaking the signal and b) the signal overtaking the front. In both cases, a blue shift of the signal frequency was observed. This blue shift can only be explained by the occurrence of the expected indirect transition and not by a direct transition without wave vector variation
Nonlinearities in silicon optical fibers
No full textThe nonlinear propagation characteristics in a hydrogenated amorphous silicon core optical fiber are investigated to demonstrate ultra-fast all-optical switching by cross-absorption modulation
An Optical Modulator in Unmodified, Commercially-Available CMOS Technology
No full text11/04/13 Meb. Accepted version, OK to pub.Here we present a method and structures for mid-infrared, free-space optical communication using unmodified, commercially available complementary metal-oxide semiconductor integrated circuits. The modulator is based on
the free carrier absorption in parasitic PN junction structures under reverse bias. Measured results demonstrate the proof-of-concept with speeds of 100bps (1.55um wavelength), but at least two orders of magnitude improvement can be achieved. This technology will enable non-galvanic chip-to-chip and chip-to-package communication as an alternative to wirebonding in applications that benefit from a planar top chip surface, such as chemical sensing lab-on-chip systems as well as general sensors
and mid-infrared communication
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