1,317 research outputs found

    Optical detection of surface vibrations /

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    Maintaining peer-based faculty evaluation: a case study involving student surveys of teaching

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    Bargaining regarding faculty evaluation is challenging in an environment in which administrators throughout higher education have successfully imposed corporate-style forms of evaluation and supervision that many have come to accept as normal, despite their incompatibility with principles of academic freedom and peer-review. Student surveys of teaching are increasingly central to this management strategy, despite the growing body of evidence indicating bias against historically marginalized groups in student survey results. This paper presents a case study of contract negotiations undertaken in 2016 at Dutchess Community College (SUNY) in Poughkeepsie, New York. During these negotiations the college administration sought to expand the use of “student evaluations of teaching” (SET) despite significant evidence that student feedback provides limited meaningful evaluative content concerning teaching and is shaped by gender, racial, and ethnic bias, as well as bias against academic rigor. We describe our effort to maintain a peer-based evaluation of student survey data, including the published research we used during negotiations and our experience with interest-based bargaining. We also analyze the strengths and weaknesses of our approach and results. These results include a successful effort to maintain the practice of limiting review of qualitative student feedback to peer-based review between faculty and department chairs within academic departments, although there was a limited but significant expansion of administrative oversight of some quantitative student survey data. Additionally, we were able to restrict the role of student feedback with contract language that limits the use of student survey results in faculty evaluation and requires that all consideration of these data be undertaken with evidence-based insight that student feedback is an important but limited vehicle for understanding the effectiveness of an individual’s teaching. Finally, an all-faculty committee of full-time and part-time faculty charged with evaluating the survey form and process was contractually established

    MARTA East Line Tunnels under I-285, Atlanta, Georgia

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    The Metropolitan Atlanta Rapid Transit Authority combined three new technologies − microtunneling, jet grouting, and rock-socketed minipiles − to successfully construct twin rail tunnels under an eight-lane highway with as little as 4-1/2 feet of cover. Geotechnical parameters, tunneling method selection, and construction methods are discussed. Ground response and monitoring are summarized

    Map of Plasmid pRAL1.

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    Map of Plasmid pRAL1

    Living aloft: Human requirements for extended spaceflight

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    Human psychological and social adjustment to space is investigated. Studies and experiences bearing on human performance capability, psychological well being, and social organization, as they relate to space, were identified and assessed, and suggestions offered as to where further research could ease the Earth/space transition. Special emphasis was given to the variables of crew size, crew diversity, and mission duration, all of which can be expected to increase in future spaceflight. By providing a conceptual framework in which issues and related information can be integrated, the hope is to aid in discovering those conditions under which future space travelers can flourish

    Autoradiographic Localization of [3H]-Nisoxetine Binding Sites in the CNS of Male and Female Japanese Quail

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    Background In the central nervous system of mammals, transporters localized on the presynaptic nerve terminals regulate the reuptake of neurotransmitters. These transporters are selective for a specific neurotransmitter such as dopamine (DA) and norepinephrine (NE). Specifically in the synapse, the dopamine transporter (DAT) reuptakes DA and the norepinephrine transporter (NET) reuptakes NE. However previous research has found that avian species do not have a gene for DAT, and therefore, birds may be using the NET to clear both NE and DA from the synapse. The current study aimed to extend this finding by localizing NET expression in male and female Japanese quail (Coturnix japonica) brains using [3H]Nisoxetine, a selective NET blocker. Results High densities of binding sites were observed in the olfactory tubercle (OTu), the medial striatum (MSt), and the lateral striatum (LSt). Lower densities of binding sites were detected in the amygdala (AMY) and hypothalamus (Hyp), and low binding was found in the medial preoptic area (mPOA) and the pallium. Conclusion The areas with the highest densities of NET are also areas that previous research has shown to have high levels of DA activity but low levels of NE innervation (e.g. striatum). The distribution of this reuptake transporter is consistent with the theory that NET acts to clear both DA and NE from the synapse

    Spring Triticale Forage Yield and Nutritive Value as Affected by Location and Maturity in Wisconsin

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    Spring triticale (X Triticosecale Wittm.) has a nutritional value that is like other spring cereal grain forages and presents a wide range in value and potential for ruminant feed (Emile et al. 2007). As varieties are improved, they may compete with oats as a spring forage source. A multi-location evaluation was conducted during 2021 in Wisconsin (Spooner, Marshfield and Lancaster) to evaluate spring triticale varieties harvested at two maturities (boot and mature stage) for yield and nutritive value. Treatments included six spring triticale varieties (AR-1, AR-2, AR-3, AR-4 and a local oat (WI-O) and triticale (WI-T) variety. Response variables measured included DM yield, and nutritive value constituents [crude protein (CP), digestibility (IVDMD, NDFD), carbohydrates (WSC, fructans, starch), fiber components (NDF, ADF, lignin) and minerals (P, K, Ca)]. Yield and nutritive value variables had interactions with locations (P \u3c 0.01). Yield for all treatments were higher at mid and south locations compared to the northern Spooner location (P \u3c 0.01). This work presents baseline information and discusses the trade off between yield and quality at the northern-most location with lower precipitation and growing degree days (GDD), leading to lower yield but higher nutritive value, as compared to mid and southern-most locations. The increasing extremes observed in weather patterns, in terms of precipitation and temperature, warrants future evaluations

    Pasture Management in the US Midwest – An Assessment of Current Practices and Future Opportunities

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    Managed grazing offers significant potential to improve the sustainability of livestock farms in the US Midwest, however the benefits of managed grazing are largely influenced by the management practices employed on farm. The objective of this study was to gain an understanding of current grazing practices on Midwest farms and to identify the knowledge and support needs of graziers. A total of 185 responses were received from a range of different enterprises including dairy, beef, and sheep production. Results show a substantial degree of variation in grazing management practices between respondents and highlights significant scope for improvement on farms particularly in the areas of pasture measurement and budgeting, and grazing infrastructure. Reported benefits of managed grazing included lower environmental impact, better pasture and animal performance, better animal health and welfare, and lower costs. Challenges with managed grazing included time and labor input, maintaining pasture quantity and quality during the grazing season, adverse weather conditions such as excessive rain and drought, and animal health challenges such as heat stress, parasites and in some cases coyotes. The study highlighted opportunities for research and extension providers to better support farmers with information and advice and identified knowledge gaps in areas such as pasture species selection, soil fertility, grazing infrastructure, pasture budgeting, legumes, and pasture measurement. The study successfully gained an insight into graziers in the Midwest, the outputs of which, will be valuable to a number of key stakeholders going forward, including researchers, extension agents, farmers and policy makers

    Comparison of feeding diets diluted with sorghum-sudangrass silage or low-quality grass on nutrient intake and digestibility and growth performance of Holstein dairy heifers

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    This study was carried out to evaluate the nutrient intakes and growth of dairy heifers offered an alfalfa silage– corn silage diet (CON; 14.3% crude protein, 61.1% total digestible nutrients, 47.9% neutral detergent fiber) compared with diets containing 1 of 2 types of sorghumsudangrass (SS) silages: conventional or photoperiod sensitive. The objective of the study was to determine the potential to use SS to control dry matter (DM) and nutrient intakes and weight gain. Both diets were similar in nutrient composition, with approximately 13% crude protein, 60 to 61% total digestible nutrients, and 55% neutral detergent fiber. Seventy-two Holstein heifers (16–18 mo at study initiation) were blocked by initial body weight (light = 422 ± 12.8 kg; medium = 455 ± 14.8 kg; heavy = 489 ± 16.7 kg) with 3 pens assigned to each weight block (8 heifers/pen; 24 heifers/block). The 3 diets were randomly allocated to the pens within each block and offered for 12 wk. Heifers offered the CON diet had greater DM, protein, and energy intakes compared with those offered the SS silage-based diets due to the greater neutral detergent fiber concentration of the SS diets. With lower DM and nutrient intakes, average daily gain was in the recommended range (0.8– 1 kg/d for Holstein heifers) for heifers offered the SS silage-based diets (mean of 0.92 kg/d for both SS diets vs. 1.11 kg/d for CON). Sorting behaviors for heifers offered both SS diets were more aggressive against long, medium, and short particles compared with those of heifers offered the CON diet; however, heifers sorted large particles from photoperiod-sensitive silage more aggressively than those from conventional silage. Based on this study, SS silage-based diets can control the DM and energy intakes for heifers and maintain optimum growth rates, with harvesting at a shorter chop length likely helping to alleviate sorting issues
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