768 research outputs found

    The ‘quiet hunt’: the significance of mushroom foraging among Russian-speaking immigrants in New York City

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    Urban foraging provides city dwellers with numerous ecosystem services, but this human- nature interaction is largely missing from the urban ecosystem services scholarship. This exploratory study aims to address this gap in the literature and examines the benefits and values associated with foraging in New York City, United States. We focus on Russian- speaking mushroom foragers, a previously unstudied community. Data from 10 interviews reveals that for some groups, foraging is primarily about cultural ecosystem services, with a provisioning attribute. Foraging supports multiple benefits, most notably contributions to social relations, cultural heritage, and recreational experiences; these nonmaterial contribu-tions often intertwine with material benefits. Our findings further demonstrate the mutual exchange of benefits between humans and nature, including services to ecosystems and species. Participants reported engagement in multiple stewardship practices and actively maintained and enhanced ecosystem services. We encourage future ecosystem services assessments to recognize foraging as an urban activity and consider the bi-directional exchange of benefits between humans and ecosystems. To some participants, foraging was an integral part of their relationship with the natural world, intertwined with relational values of connection to nature, kinship, love, and care. Our results suggest that relational values can be central for understanding the value of ecosystem services. Our study further illustrates that some ecosystem services may be associated with practices, rather than places, and future work should examine these links in more detail. Environmental stewardship; human-nature connectedness; relational values; urban greenspaces; well-beingpublishedVersio

    The Academic Effects of Chronic Exposure to Neighborhood Violence

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    We estimate the causal effect of repeated exposure to violent crime on test scores in New York City. We use two distinct empirical strategies; value-added models linking student performance on standardized exams to violent crimes on a student’s residential block, and a regression discontinuity approach that identifies the acute effect of an additional crime exposure within a one-week window. Exposure to violent crime reduces academic performance. Value added models suggest the average effect is very small; approximately -0.01 standard deviations in English Language Arts (ELA) and mathematics. RD models suggest a larger effect, particularly among children previously exposed. The marginal acute effect is as large as -0.04 standard deviations for students with two or more prior exposures. Among these, it is even larger for black students, almost a 10th of a standard deviation. We provide credible causal evidence that repeated exposure to neighborhood violence harms test scores, and this negative effect increases with exposure

    The Value of the Vestibular/Ocular Motor Screening (VOMS) in Evaluating Adolescent Patients with Concussions

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    OBJECTIVE To determine the VOMS can differentiate between typical and protracted recoveries in adolescent patients

    Comparative evaluation of the hygienic efficacy of an ultra-rapid hand dryer vs conventional warm air hand dryers

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    AIMS: To compare an ultra-rapid hand dryer against warm air dryers, with regard to: (A) bacterial transfer after drying and (B) the impact on bacterial numbers of rubbing hands during dryer use. METHODS AND RESULTS: The Airblade™ dryer (Dyson Ltd) uses two air 'knives' to strip water from still hands, whereas conventional dryers use warm air to evaporate moisture whilst hands are rubbed together. These approaches were compared using 14 volunteers; the Airblade™ and two types of warm air dryer. In study (A), hands were contaminated by handling meat and then washed in a standardized manner. After dryer use, fingers were pressed onto foil and transfer of residual bacteria enumerated. Transfers of 0-10(7) CFU per five fingers were observed. For a drying time of 10 s, the Airblade™ led to significantly less bacterial transfer than the other dryers (P 0·05, range 0·1317-0·4099). In study (B), drying was performed ± hand rubbing. Contact plates enumerated bacteria transferred from palms, fingers and fingertips before and after drying. When keeping hands still, there was no statistical difference between dryers, and reduction in the numbers released was almost as high as with paper towels. Rubbing when using the warm air dryers inhibited an overall reduction in bacterial numbers on the skin (P < 0·05). CONCLUSIONS: Effective hand drying is important for reducing transfer of commensals or remaining contaminants to surfaces. Rubbing hands during warm air drying can counteract the reduction in bacterial numbers accrued during handwashing. SIGNIFICANCE AND IMPACT OF THE STUDY: The Airblade™ was superior to the warm air dryers for reducing bacterial transfer. Its short, 10 s drying time should encourage greater compliance with hand drying and thus help reduce the spread of infectious agents via hands

    Subjective experiences of compulsory treatment from a qualitative study of early implementation of the Mental Health (Care and Treatment)(Scotland) Act 2003

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    Compulsory psychiatric treatment is highly contested, and little research has focused specifically on direct experiences. The Mental Health (Care & Treatment) (Scotland) Act, 2003 introduced new roles and provisions including community treatment orders, and was designed to increase participation, ensure treatment was beneficial and was the ‘least restrictive’ alternative. This article draws on findings from semistructured interviews with 49 individuals who had experienced compulsion under this new legislation during 2007-08, that were part of a broader cohort study. Interviews with service users were conducted at two stages with 80% agreeing to be interviewed twice. The sample included people on a variety of compulsory orders from four Health Board areas, some of whom had been detained for the first time, while others reported ‘revolving door’ experiences. Peer researchers who were mental health service users carried out the interviews with professional researchers. The findings suggest that legislation had a limited impact on participation in the process of compulsion. Consensus was that although service users felt there was increased opportunity for their voices to be heard, this was not matched by having increased influence over professional decision-making, especially in relation to drug treatments. According to people's direct experiences, the passing of the legislation in itself had done little to change the dominant psychiatric paradigm. While providing a foundation for improving the process of compulsion, the findings suggest that as well as legislative reform, fundamental shifts in practice are needed both in terms of the nature of therapeutic relationships, and in embracing more holistic and recovery perspectives

    Impedance Bridge Network Problem as Solved by Relaxation Method

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    Here it is shown how the relaxation method con be advantageously used to solve the problems of A. C. networks containing complex circuit constant. This has been done in the solution of impedance bridge network problem in which many useful information are obtained at a time. The results so obtained ate compared with those calculated by the conventional method

    A Comprehensive Spectroscopic Analysis of DB White Dwarfs

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    We present a detailed analysis of 108 helium-line (DB) white dwarfs based on model atmosphere fits to high signal-to-noise optical spectroscopy. We derive a mean mass of 0.67 Mo for our sample, with a dispersion of only 0.09 Mo. White dwarfs also showing hydrogen lines, the DBA stars, comprise 44% of our sample, and their mass distribution appears similar to that of DB stars. As in our previous investigation, we find no evidence for the existence of low-mass (M < 0.5 Mo) DB white dwarfs. We derive a luminosity function based on a subset of DB white dwarfs identified in the Palomar-Green survey. We show that 20% of all white dwarfs in the temperature range of interest are DB stars, although the fraction drops to half this value above Teff ~ 20,000 K. We also show that the persistence of DB stars with no hydrogen features at low temperatures is difficult to reconcile with a scenario involving accretion from the interstellar medium, often invoked to account for the observed hydrogen abundances in DBA stars. We present evidence for the existence of two different evolutionary channels that produce DB white dwarfs: the standard model where DA stars are transformed into DB stars through the convective dilution of a thin hydrogen layer, and a second channel where DB stars retain a helium-atmosphere throughout their evolution. We finally demonstrate that the instability strip of pulsating V777 Her white dwarfs contains no nonvariables, if the hydrogen content of these stars is properly accounted for.Comment: 74 pages including 30 figures, accepted for publication in the Astrophysical Journa
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