996 research outputs found

    Reconciling Techno-simplicity and Eco-complexity for future food security

    Get PDF
    Ecological intensification has been proposed as a paradigm for ensuring global food security while preserving biodiversity and ecosystem integrity. Ecologicalintensification was originally coined to promote precise site-specific farming practices aimed at reducing yield gaps, while avoiding negative environmental impacts (techno-simplicity). Recently, it has been extended to stress the importance of landscape complexity to preserve biodiversity and ecosystem services (eco-complexity). While these perspectives on ecological intensification may seem distinct, they are not incompatible and should be interwoven to create more comprehensive and practical solutions. Here, we argue that designing cropping systems to be more diverse, across space and time would be an effective route to accomplish environmentally-friendly intensification of crop production. Such a novel approach will require better integration of knowledge at the landscape level for increasing agro-biodiversity(focused on interventions outside fields) with strategies diversifying croppingsystems to manage weeds and pests (focused on interventions inside fields).Fil: Poggio, Santiago Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura; Argentina. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Producción Vegetal. Cátedra de Producción Vegetal; ArgentinaFil: Macfadyen, Sarina. CSIRO; AustraliaFil: Bohan, David A.. Institut National de la Recherche Agronomique; Franci

    Frequentist Guarantees of Distributed (Non)-Bayesian Inference

    Full text link
    Motivated by the need to analyze large, decentralized datasets, distributed Bayesian inference has become a critical research area across multiple fields, including statistics, electrical engineering, and economics. This paper establishes Frequentist properties, such as posterior consistency, asymptotic normality, and posterior contraction rates, for the distributed (non-)Bayes Inference problem among agents connected via a communication network. Our results show that, under appropriate assumptions on the communication graph, distributed Bayesian inference retains parametric efficiency while enhancing robustness in uncertainty quantification. We also explore the trade-off between statistical efficiency and communication efficiency by examining how the design and size of the communication graph impact the posterior contraction rate. Furthermore, We extend our analysis to time-varying graphs and apply our results to exponential family models, distributed logistic regression, and decentralized detection models

    Building Stronger Nonprofits Through Better Financial Management: Early Efforts in 26 Youth-Serving Organizations

    Get PDF
    Outlines the Financial Management in Out-of-School Time initiative to improve nonprofits' long-term financial management capacity and reform funding practices that weaken it, challenges participating nonprofits faced, progress to date, and early lessons

    Nineteenth Century Rosa Parks? Assessing Elizabeth Jennings\u27 Legacy as a Teacher and Civil Rights Pioneer in Antebellum America

    Get PDF
    Elizabeth Jennings should be recognized as more than a Rosa Parks figure in Antebellum New York City history. Both Jennings\u27 and Parks\u27 experiences with segregation on public transportation are similar, but they are not the same. Jennings\u27 ejection from a New York streetcar was not deliberately planned, nor did her removal from the streetcar lead to mass protests or boycotts in New York City or throughout the country. Similarly though, as many African Americans endured violence during the Civil Rights movement of the 1950s and 1960s, Elizabeth Jennings also survived the New York City Draft Riots in 1863. Overall, both women deserve their own respective place in United States history because they were emblematic of the socio-political issues of their time - Jennings in the Antebellum Era and Parks in the post-World War II civil rights movement

    More than a feeling: Tracing the progressive era origins of historical empathy in the social studies curriculum, 1890–1940s

    Get PDF
    Understanding historical empathy is a bourgeoning subfield of social studies education research. Students demonstrate historical empathy by analyzing sources 1) to determine historical context, 2) identify perspectives of historical figures, and 3) make affective connections to historical content. Therefore, the purpose of this research is to examine primary sources from educational leaders and organizations during the Progressive Era in American public school education in order to trace the origins of historical empathy as an implicit goal in the social studies curriculum. Our guiding research question is “How does the work of Progressive Era organizations and educational leaders impact how Americans viewed historical empathy?” We purposefully selected documents from Progressive Era organizations and certain leaders whose work formed a strong foundation of social studies education history. We conclude with an examination of the importance of historical empathy today in order to demonstrate the importance of historical empathy as a curricular aim of social studies education

    A Reflective Study of Online Faculty Teaching Experiences in Higher Education

    Get PDF
    Despite the popularity of online course and degree offerings in higher education, a lack of data persists on the unique challenges and opportunities online faculty face. Gaining insights about these experiences is important to ensure the quality of online teaching as colleges and universities continue expanding e-learning programs. Therefore, the purpose of this study is to examine the online teaching experiences of two faculty members through the implementation of reflective study methods. Major findings show that faculty access to professional development and mentoring, isolation and connectedness to the campus community, and academic freedom and curriculum control have significant implications for online teaching and student learning. In the wake of COVID-19 as colleges across the nation suddenly are faced with moving to exclusively online learning, this study is needed more than ever

    “I Hate History”: A Study of Student Engagement in Community College Undergraduate History Courses

    Get PDF
    Many instructors seek to improve student engagement, but determining how to achieve student engagement can be complex and complicated. The authors sought to explore how the implementation of active-learning strategies in undergraduate history courses at a metropolitan community college using graphic organizers and group discussion impacted student engagement. Surveys were distributed to students in five undergraduate history courses in order to elicit student perspectives on how active-learning strategies improved student engagement. The survey data revealed that some active-learning strategies improved student engagement, whereas others did not. The authors report that a combination of implementing lecture and active-learning strategies was effective in fostering student engagement in their undergraduate history courses

    Collective behavior of squirmers in thin films

    Full text link
    Bacteria in biofilms form complex structures and can collectively migrate within mobile aggregates, which is referred to as swarming. This behavior is influenced by a combination of various factors, including morphological characteristics and propulsive forces of swimmers, their volume fraction within a confined environment, and hydrodynamic and steric interactions between them. In our study, we employ the squirmer model for microswimmers and the dissipative particle dynamics method for fluid modeling to investigate the collective motion of swimmers in thin films. The film thickness permits a free orientation of non-spherical squirmers, but constraints them to form a two-layered structure at maximum. Structural and dynamic properties of squirmer suspensions confined within the slit are analyzed for different volume fractions of swimmers, motility types (e.g., pusher, neutral squirmer, puller), and the presence of a rotlet dipolar flow field, which mimics the counter-rotating flow generated by flagellated bacteria. Different states are characterized, including a gas-like phase, swarming, and motility-induced phase separation, as a function of increasing volume fraction. Our study highlights the importance of an anisotropic swimmer shape, hydrodynamic interactions between squirmers, and their interaction with the walls for the emergence of different collective behaviors. Interestingly, the formation of collective structures may not be symmetric with respect to the two walls. Furthermore, the presence of a rotlet dipole significantly mitigates differences in the collective behavior between various swimmer types. These results contribute to a better understanding of the formation of bacterial biofilms and the emergence of collective states in confined active matter.Comment: 17 pages, 12 figure

    Dynamics of a structured slug population model in the absence of seasonal variation

    Get PDF
    We develop a novel, nonlinear structured population model for the slug Deroceras reticulatum, a highly significant agricultural pest of great economic impact, in both organic and non-organic settings. In the absence of seasonal variations, we numerically explore the effect of life history traits that are dependent on an individual's size and measures of population biomass. We conduct a systematic exploration of parameter space and highlight the main mechanisms and implications of model design. A major conclusion of this work is that strong size dependent predation significantly adjusts the competitive balance, leading to non-monotonic steady state solutions and slowly decaying transients consisting of distinct generational cycles. Furthermore, we demonstrate how a simple ratio of adult to juvenile biomass can act as a useful diagnostic to distinguish between predated and non-predated environments, and may be useful in agricultural settings

    Juvenile Dermatomyositis

    Full text link
    corecore