434 research outputs found

    An Intervention Model For Homeless Youth

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    Youth homelessness has become a more visible problem in recent years, and is exacerbated by changes in the central city economy, schooling, and the family. This article describes the Street Youth Employment Program, a program designed by sociological practitioners to intervene into the lives of homeless street youth through a collaborative effort between a socio-medical clink and an urban university. Program elements included (1) Stabilizing the living conditions of homeless youth, (2) Providing immediate part-time employment for participants on subsidized work projects, (3) Ensuring participation by youth in program policy and operation, and (4) Providing education and on-the-job training for youth. Of the youth who participated in the program (N = 16), the majority (70%) successfully moved away from living on the street to more stable involvement in work or school. The limited success of the intervention was attributed primarily to the linkage of meaningful employment with stable living arrangements, and attention to medical and mental health needs. It was noted that direct job creation is a more appropriate intervention strategy for homeless youth man pre-employment and job readiness services alone

    An Evaluation of Columbia Villa/Tamaracks Community Service Intervention Project

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    The Community Service Intervention Program (CSlP) is a unique public agency response to a multifaceted set of problems confronting low income residents living in Oregon \u27s largest public housing project. The primary goals of the CSIP are to reduce crime, reduce the fear of crime among residents, and to improve the quality of life of the families living in Columbia Villa/Tamaracks. The evaluation of the CSIP combined a number of different research methods, on different analytical levels, to provide a summary assessment. Data were collected from individuals, from agencies, and from police records in a post facto analysis of the CSIP. Recommendations include: a higher profile by the County to coordinate, plan, manage, and evaluate services according to a set of carefully chosen set of objectives; a longitudinal evaluation of CSIP efforts; greater involvement by Columbia Villa/Tamaracks residents; greater job opportunities and job training for Columbia Villa/Tamaracks residents; additional participation in the CSIP by the Fire Department, Tri-Met, Metro (Solid Waste), and DEQ

    Diagnostic and Imaging Approaches to Chest Wall Lesions

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    Chest wall lesions are relatively uncommon and may be challenging once they are encountered on images. Radiologists may detect these lesions incidentally at examinations performed for other indications, or they may be asked specifically to evaluate a suspicious lesion. While many chest wall lesions have characteristic imaging findings that can result in an accurate diagnosis with use of imaging alone, other entities are difficult to distinguish at imaging because there is significant overlap among them. The interpreting radiologist should be familiar with the imaging features of both "do not touch" benign entities (which can be confidently diagnosed with imaging only, with no need for biopsy or resection unless the patient is symptomatic) and lesions that cannot be confidently characterized and thus require further workup. CT and MRI are the main imaging modalities used to assess the chest wall, with each having different benefits and drawbacks. Chest wall lesions can be classified according to their predominant composition: fat, calcification and ossification, soft tissue, or fluid. The identification or predominance of signal intensities or attenuation for these findings, along with the patient age, clinical history, and lesion location, can help establish the appropriate differential diagnosis. In addition, imaging findings in other organs, such as the lungs or upper abdomen, can at times provide clues to the underlying diagnosis. The authors review different chest wall lesions classified on the basis of their composition and highlight the imaging findings that can assist the radiologist in narrowing the differential diagnosis and guiding management

    The connectome of the adult Drosophila mushroom body provides insights into function

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    Making inferences about the computations performed by neuronal circuits from synapse-level connectivity maps is an emerging opportunity in neuroscience. The mushroom body (MB) is well positioned for developing and testing such an approach due to its conserved neuronal architecture, recently completed dense connectome, and extensive prior experimental studies of its roles in learning, memory, and activity regulation. Here, we identify new components of the MB circuit in Drosophila, including extensive visual input and MB output neurons (MBONs) with direct connections to descending neurons. We find unexpected structure in sensory inputs, in the transfer of information about different sensory modalities to MBONs, and in the modulation of that transfer by dopaminergic neurons (DANs). We provide insights into the circuitry used to integrate MB outputs, connectivity between the MB and the central complex and inputs to DANs, including feedback from MBONs. Our results provide a foundation for further theoretical and experimental work

    Search for heavy lepton resonances decaying to a ZZ boson and a lepton in pppp collisions at s=8\sqrt{s}=8 TeV with the ATLAS detector

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    A search for heavy leptons decaying to a ZZ boson and an electron or a muon is presented. The search is based on pppp collision data taken at s=8\sqrt{s}=8 TeV by the ATLAS experiment at the CERN Large Hadron Collider, corresponding to an integrated luminosity of 20.3 fb−1^{-1}, Three high-transverse-momentum electrons or muons are selected, with two of them required to be consistent with originating from a ZZ boson decay. No significant excess above Standard Model background predictions is observed, and 95% confidence level limits on the production cross section of high-mass trilepton resonances are derived. The results are interpreted in the context of vector-like lepton and type-III seesaw models. For the vector-like lepton model, most heavy lepton mass values in the range 114-176 GeV are excluded. For the type-III seesaw model, most mass values in the range 100-468 GeV are excluded

    Measurement of distributions sensitive to the underlying event in inclusive Z-boson production in pp collisions at √s = 7 TeV with the ATLAS detector

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    A measurement of charged-particle distributions sensitive to the properties of the underlying event is presented for an inclusive sample of events containing a TeX -boson, decaying to an electron or muon pair. The measurement is based on data collected using the ATLAS detector at the LHC in proton–proton collisions at a centre-of-mass energy of TeX TeV with an integrated luminosity of TeX fb TeX . Distributions of the charged particle multiplicity and of the charged particle transverse momentum are measured in regions of azimuthal angle defined with respect to the TeX -boson direction. The measured distributions are compared to similar distributions measured in jet events, and to the predictions of various Monte Carlo generators implementing different underlying event models

    Search for new phenomena in events containing a same-flavour opposite-sign dilepton pair, jets, and large missing transverse momentum in s=\sqrt{s}= 13 pppp collisions with the ATLAS detector

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    Two searches for new phenomena in final states containing a same-flavour opposite-lepton (electron or muon) pair, jets, and large missing transverse momentum are presented. These searches make use of proton--proton collision data, collected during 2015 and 2016 at a centre-of-mass energy s=13\sqrt{s}=13 TeV by the ATLAS detector at the Large Hadron Collider, which correspond to an integrated luminosity of 14.7 fb−1^{-1}, Both searches target the pair production of supersymmetric particles, squarks or gluinos, which decay to final states containing a same-flavour opposite-sign lepton pair via one of two mechanisms: a leptonically decaying Z boson in the final state, leading to a peak in the dilepton invariant-mass distribution around the Z boson mass; and decays of neutralinos (e.g. χ~20→ℓ+ℓ−χ~10\tilde{\chi}_2^0 \rightarrow \ell^+\ell^- \tilde{\chi}_1^0), yielding a kinematic endpoint in the dilepton invariant-mass spectrum. The data are found to be consistent with the Standard Model expectation. Results are interpreted in simplified models of gluino-pair (squark-pair) production, and provide sensitivity to gluinos (squarks) with masses as large as 1.70 TeV (980 GeV).publishedVersio

    Measurement of the muon reconstruction performance of the ATLAS detector using 2011 and 2012 LHC proton–proton collision data

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    This paper presents the performance of the ATLAS muon reconstruction during the LHC run with pp collisions at √s = 7–8 TeV in 2011–2012, focusing mainly on data collected in 2012. Measurements of the reconstruction efficiency and of the momentum scale and resolution, based on large reference samples of J/ψ → μμ, Z → μμ and ϒ → μμ decays, are presented and compared to Monte Carlo simulations. Corrections to the simulation, to be used in physics analysis, are provided. Over most of the covered phase space (muon |η| < 2.7 and 5 ≲pT ≲pT 100 GeV) the efficiency is above 99% and is measured with per-mille precision. The momentum resolution ranges from 1.7% at central rapidity and for transverse momentum pT ≃ 10 GeV, to 4% at large rapidity and pT ≃ 100 GeV. The momentum scale is known with an uncertainty of 0.05% to 0.2% depending on rapidity. A method for the recovery of final state radiation from the muons is also presented

    Search for invisible decays of the Higgs boson produced in association with a hadronically decaying vector boson in pppp collisions at s=8\sqrt{s} = 8 TeV with the ATLAS detector

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    A search for Higgs boson decays to invisible particles is performed using 20.3 fb\).{-1}\) of pppp collision data at a centre-of-mass energy of 8 TeV recorded by the ATLAS detector at the Large Hadron Collider. The process considered is Higgs boson production in association with a vector boson VV = WW or ZZ that decays hadronically, resulting in events with two or more jets and large missing transverse momentum. No excess of candidates is observed in the data over the background expectation. The results are used to constrain VHVH production followed by HH decaying to invisible particles for the Higgs mass range 115<mH<300115<m_H<300 GeV. The 95% confidence-level observed upper limit on σVH×BR(H→inv.)\sigma_{VH} \times \text{BR}(H\rightarrow \text{inv.}) varies from 1.6 pb at 115 GeV to 0.13 pb at 300 GeV. Assuming Standard Model production and including the gg→Hgg\rightarrow H contribution as signal, the results also lead to an observed upper limit of 78% at 95% confidence level on the branching ratio of Higgs bosons decays to invisible particles at a mass of 125 GeV.publishedVersio
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