3,466 research outputs found

    Museum Services Act (1984): News Article 02

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    School Boards and Team Learning: A Phenomenological Study of the Beliefs of School Board Presidents in Central New York

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    The Boards of Education in New York State schools face formidable challenges in an educational environment characterized by accelerated and complex change. This contemporary context requires boards to function as high-performing teams to generate outcomes. Board members typically are well-intentioned yet unprepared for such challenges. This research study used a qualitative phenomenological design to examine the beliefs of school board presidents about how boards develop the capacity to work together to create results. Semi-structured interviews were conducted with school board presidents in Central New York. Interview questions were guided by the theoretical framework of team learning. The analysis revealed four major categories and conclusions: (a) school boards develop the capacity of their teams through acquisition and sharing of knowledge, balanced board composition, and board president leadership; (b) boards interact as a team through communication, adhering to governance structures, understanding of roles, and mutual respect; (c) boards are confronted with challenges to address including personal agendas, micromanagement, and time; and lastly, (d) school boards create results by establishing students as the highest priority and continually reflecting on performance. A group of individuals does not constitute a team; rather, successful teams (boards) perform as a unit and are accountable to a collective performance. The study recommends that boards be mindful of the beliefs of the board presidents captured in the research as they work together to create results that will benefit future generations of school children. Information gleaned from this study adds to the literature and understanding of school boards and informs school board learning and preparation

    Deep Multi-view Models for Glitch Classification

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    Non-cosmic, non-Gaussian disturbances known as "glitches", show up in gravitational-wave data of the Advanced Laser Interferometer Gravitational-wave Observatory, or aLIGO. In this paper, we propose a deep multi-view convolutional neural network to classify glitches automatically. The primary purpose of classifying glitches is to understand their characteristics and origin, which facilitates their removal from the data or from the detector entirely. We visualize glitches as spectrograms and leverage the state-of-the-art image classification techniques in our model. The suggested classifier is a multi-view deep neural network that exploits four different views for classification. The experimental results demonstrate that the proposed model improves the overall accuracy of the classification compared to traditional single view algorithms.Comment: Accepted to the 42nd IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP'17

    Composite Reflective/Absorptive IR-Blocking Filters Embedded in Metamaterial Antireflection Coated Silicon

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    Infrared (IR) blocking filters are crucial for controlling the radiative loading on cryogenic systems and for optimizing the sensitivity of bolometric detectors in the far-IR. We present a new IR filter approach based on a combination of patterned frequency selective structures on silicon and a thin (50 μm\mu \textrm{m} thick) absorptive composite based on powdered reststrahlen absorbing materials. For a 300 K blackbody, this combination reflects \sim50\% of the incoming light and blocks \textgreater 99.8\% of the total power with negligible thermal gradients and excellent low frequency transmission. This allows for a reduction in the IR thermal loading to negligible levels in a single cold filter. These composite filters are fabricated on silicon substrates which provide excellent thermal transport laterally through the filter and ensure that the entire area of the absorptive filter stays near the bath temperature. A metamaterial antireflection coating cut into these substrates reduces in-band reflections to below 1\%, and the in-band absorption of the powder mix is below 1\% for signal bands below 750 GHz. This type of filter can be directly incorporated into silicon refractive optical elements

    Social Change and Social Action

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    We define social action as a strategy to obtain limited social change at the intermediate or macro levels of society which is generally used in nonconsensus situations and employs both norm-adhering and norm-testing modes of intervention. In this formulation, the key concept is social change. This paper proposes to explore certain aspects of social change as they apply to social action. The discussion is divided into two parts. The first is a brief summary of pertinent social change theory, presented as background for part two in which are presented and discussed certain propositions about planned change that are critical to any social action endeavor. This treatment, obviously, will not cover every subconcept of social change that is applicable to social action. Nor does it include a direct discussion of power, crucial as this is for social action; that requires a separate treatment of its own. Only five concepts are selected and discussed: social movements, crisis, conflict, resistance to change, and legitimacy

    Effect of supervised exercise on physical function and balance in patients with intermittent claudication

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    Background The aim of the study was to identify whether a standard supervised exercise programme (SEP) for patients with intermittent claudication improved specific measures of functional performance including balance. Methods A prospective observational study was performed at a single tertiary vascular centre. Patients with symptomatic intermittent claudication (Rutherford grades 1–3) were recruited to the study. Participants were assessed at baseline (before SEP) and 3, 6 and 12 months afterwards for markers of lower-limb ischaemia (treadmill walking distance and ankle : brachial pressure index), physical function (6-min walk, Timed Up and Go test, and Short Physical Performance Battery (SPPB) score), balance impairment using computerized dynamic posturography with the Sensory Organization Test (SOT), and quality of life (VascuQoL and Short Form 36). Results Fifty-one participants underwent SEP, which significantly improved initial treadmill walking distance (P = 0·001). Enrolment in a SEP also resulted in improvements in physical function as determined by 6-min maximum walking distance (P = 0·006), SPPB score (P < 0·001), and some domains of both generic (bodily pain, P = 0·025) and disease-specific (social domain, P = 0·039) quality of life. Significant improvements were also noted in balance, as determined by the SOT (P < 0·001). Conclusion Supervised exercise improves both physical function and balance impairment

    Instability of streamwise vortices in plane channel flows

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    We present analysis and numerical experiments on the instability of streamwise vortices in 'minimal channel' flows and argue that this instability is a key feature in the observed intermittent cycle of formation, break-up, and re-formation of these structures. The base flow is a three-component, two-dimensional pair of counter-rotating rolls with axes aligned along the direction of the mean shear. While it is not a steady solution to the Navier-Stokes equations, we show numerically that this flow is unstable on a fast time scale to a secondary, three-dimensional Floquet mode. The growth of the secondary instability does not saturate in a new equilibrium, but continues until highly unstable local shear layers form and the entire flow breaks down into turbulence. Our analysis is motivated in part by the strong similarities between the intermittent turbulent cycle in minimal channel flows and one studied, both experimentally and in computations, in Couette-Taylor flow
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