Transition and Resilience in the Kansas Flint Hills

The tallgrass prairie has persisted in the Flint Hills of east-central Kansas for both biophysical and socioeconomic reasons, and has been one of the key elements in the development of the region. A population boom in the latter part of the 19th century and the subsequent increase in cattle in the 1860s-1870s were key factors in the transition of this landscape into a major cattle grazing region by the turn of the 20th century. At various points in the past 150 years, this social ecosystem has exhibited remarkable resilience in episodes of both drought and over-grazing. The resilience of the bluestem pastures had implications for stability in the rural economy. Yet, the land use regimes have undergone change since Euro-American arrival, thus the human signature on the land is by no means static. We approach the human-environment relationship as an ecological dialogue that includes both biophysical and social elements mutually shaping each other, and driven by human interests as much as biophysical factors. Current threats to the tallgrass prairie, including fragmentation and invasive species are discussed

study on the validation of ring filament winding methods for unidirectional preform ply manufacturing

AbstractRing filament winding enables processing of continuous fibers for manufacturing unidirectional non-crimp unidirectional preform plies on straight-, curved-, or closed-mandrel geometries. However, unidirectional processing of tows can lead to increased lateral tow slippage. The objective of the present study is thus to validate unidirectional winding methods for ring filament winding, performing geodesic and non-geodesic trajectories analytically and experimentally. Implementation of geodesic paths investigates the influence of the tensile force and take-up velocity on the winding angle reproducibility. Non-geodesic winding paths are conducted here dependent on winding methods, slippage coefficients, and the mandrel's surface materials, evidencing the occurrence of lateral tow slippage by measurements of nip-point forces. Findings indicate an excellent reproducibility of geodesic paths independent of the process velocity. Non-geodesic paths were partially validated because of the occurrence of late..

Climate Change Challenges for Extension Educators: Technical Capacity and Cultural Attitudes

We surveyed Extension educators in the southern Great Plains about their attitudes and beliefs regarding climate change, their interactions with constituents surrounding climate change, and challenges they face in engaging constituents on the topic of climate change. Production-oriented and sociocultural challenges in meeting constituents\u27 information needs exist. Educators reported (a) lacking capacity for addressing climate change issues and (b) needing information, especially regarding drought and extreme or unseasonable weather events and related management practices. Educators also identified a need for more educational resources, including print materials and online decision aids. Implications are relevant to educators working beyond the study area and in any agricultural production system

Reconstruction of Network Evolutionary History from Extant Network Topology and Duplication History

Genome-wide protein-protein interaction (PPI) data are readily available thanks to recent breakthroughs in biotechnology. However, PPI networks of extant organisms are only snapshots of the network evolution. How to infer the whole evolution history becomes a challenging problem in computational biology. In this paper, we present a likelihood-based approach to inferring network evolution history from the topology of PPI networks and the duplication relationship among the paralogs. Simulations show that our approach outperforms the existing ones in terms of the accuracy of reconstruction. Moreover, the growth parameters of several real PPI networks estimated by our method are more consistent with the ones predicted in literature.Comment: 15 pages, 5 figures, submitted to ISBRA 201

Transition and Resilience in the Kansas Flint Hills

The tallgrass prairie has persisted in the Flint Hills of east-central Kansas for both biophysical and socioeconomic reasons, and has been one of the key elements in the development of the region. A population boom in the latter part of the 19th century and the subsequent increase in cattle in the 1860s-1870s were key factors in the transition of this landscape into a major cattle grazing region by the turn of the 20th century. At various points in the past 150 years, this social ecosystem has exhibited remarkable resilience in episodes of both drought and over-grazing. The resilience of the bluestem pastures had implications for stability in the rural economy. Yet, the land use regimes have undergone change since Euro-American arrival, thus the human signature on the land is by no means static. We approach the human-environment relationship as an ecological dialogue that includes both biophysical and social elements mutually shaping each other, and driven by human interests as much as biophysical factors. Current threats to the tallgrass prairie, including fragmentation and invasive species are discussed

How do we integrate skills and content in classics? An inquiry into students’ use of sources

Engagement with primary sources is a key feature of arts and humanities subjects, particularly classics and ancient history. Recent instructional trends emphasise integrating skills with content, particularly in the first year of higher education. We investigate how successfully first-year university students used a variety of sources in an integrated skills and content course, through analysis of 84 final essays. Most students used four to nine sources in a 1500 word essay, but only one type of ancient source. The findings express the need to move from debates about whether to integrate skills or not, to greater discuss how key discipline-specific skills are integrated into content-based courses. Cognitive apprenticeship theory, and a thematic approach used in museum education, are used to reflect on the findings and discuss how teachers might better support students in this key aspect of the discipline

Network Archaeology: Uncovering Ancient Networks from Present-day Interactions

Often questions arise about old or extinct networks. What proteins interacted in a long-extinct ancestor species of yeast? Who were the central players in the Last.fm social network 3 years ago? Our ability to answer such questions has been limited by the unavailability of past versions of networks. To overcome these limitations, we propose several algorithms for reconstructing a network's history of growth given only the network as it exists today and a generative model by which the network is believed to have evolved. Our likelihood-based method finds a probable previous state of the network by reversing the forward growth model. This approach retains node identities so that the history of individual nodes can be tracked. We apply these algorithms to uncover older, non-extant biological and social networks believed to have grown via several models, including duplication-mutation with complementarity, forest fire, and preferential attachment. Through experiments on both synthetic and real-world data, we find that our algorithms can estimate node arrival times, identify anchor nodes from which new nodes copy links, and can reveal significant features of networks that have long since disappeared.Comment: 16 pages, 10 figure