Quiet engine program flight engine design study

The results are presented of a preliminary flight engine design study based on the Quiet Engine Program high-bypass, low-noise turbofan engines. Engine configurations, weight, noise characteristics, and performance over a range of flight conditions typical of a subsonic transport aircraft were considered. High and low tip speed engines in various acoustically treated nacelle configurations were included

Knowledge and causal attributions for mental disorders in HIV-positive children and adolescents: results from rural and urban Uganda

© 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group. Increasing availability of antiretroviral treatment (ART) has led HIV to be considered a chronic disease, shifting attention to focus on quality of life including mental wellbeing. We investigated knowledge and causal attributions for mental disorders in HIV-positive children and adolescents in rural and urban Uganda. This qualitative study was nested in an epidemiological mental health study among HIV-positive children and adolescents aged 5–17years in rural and urban Uganda. In-depth interviews were conducted with caregivers of HIV-positive children (5–11years) and adolescents (12–17years) in HIV care. Interviews were audio recorded with permission from participants and written consent and assent sought before study procedures. Thirty eightparticipants (19 caregivers, 19 children/adolescents) were interviewed. Age range of caregivers was 28–69years; majority were female (17). Caregivers hadlittle knowledge on mental disorders;only 3 related the vignette to a mental problem andattributed itto: improper upbringing, violence, poverty and bereavement. Five adolescents identified vignettes as portraying mental disorders caused by: ill-health of parents, bereavement, child abuse, discrimination, HIV and poverty. Caregivers are not knowledgeable about behavioural and emotional challenges in HIV-positive children/adolescents. Mental health literacy programmes at HIV care clinics are essential to enhance treatment-seeking for mental health

Vanishing Viscosity Limits and Boundary Layers for Circularly Symmetric 2D Flows

We continue the work of Lopes Filho, Mazzucato and Nussenzveig Lopes [LMN], on the vanishing viscosity limit of circularly symmetric viscous flow in a disk with rotating boundary, shown there to converge to the inviscid limit in $L^2$-norm as long as the prescribed angular velocity $\alpha(t)$ of the boundary has bounded total variation. Here we establish convergence in stronger $L^2$ and $L^p$-Sobolev spaces, allow for more singular angular velocities $\alpha$, and address the issue of analyzing the behavior of the boundary layer. This includes an analysis of concentration of vorticity in the vanishing viscosity limit. We also consider such flows on an annulus, whose two boundary components rotate independently. [LMN] Lopes Filho, M. C., Mazzucato, A. L. and Nussenzveig Lopes, H. J., Vanishing viscosity limit for incompressible flow inside a rotating circle, preprint 2006

Some Observations of Wake Behavior in Laminar and Turbulence Free Stream Flow

Visual observations of the sphere wake have been obtained using the flash photolysis technique. Free stream turbulence of 7 and 10% was found to progressively reduce the size of the wake but no turbulence was found in the attached shear layer nor was the position of the separation point affected. A separation bubble was identified as predicted by Son and Hanratty (1969). Evidence is presented to show that drag reduction in turbulent free streams is not due to turbulence in the attached boundary layer but to enhanced momentum transfer in the wake

Risk of major depressive disorder among older persons living in HIV-endemic central and southwestern Uganda.

: Major depressive disorder (MDD) is projected to become the second most common cause of disability by 2020 calling for a better understanding its antecedents across the lifespan and in diverse socio-cultural settings. In this paper we describe the risk factors of MDD among older people (50 years +) living in HIV-endemic central and southwestern Uganda. A cross-sectional study was undertaken among 471 respondents (50 years +) participating in the Wellbeing of Older People's Study cohort of the MRC/UVRI Uganda research Unit on AIDS in Uganda. Participants were from five strata: HIV negative, HIV positive on ART, HIV positive not on ART, having an adult child on ART, and having an adult child who died of HIV. Overall MDD prevalence was 9.2% (95% CI 6.7-12.2%) with a prevalence among males of 7.4% (95% CI 4.0-12.3%) and females of 10.3% (95% CI 7.0-14.3%). Factors significantly associated with MDD included: declining socio-economic status, increasing disability scores, decreasing mean grip strength, reported back pain, and not having hypertension. Marginally associated with MDD was being HIV infected and not on ART.<br/

Marriage, Intimacy and Risk of HIV Infection in South West Uganda

Long-term, monogamous, relationships are often portrayed as protective in HIV prevention campaigns. Focusing on marriage in a community in south west Uganda, we examine why and how people enter long term relationships, what their expectations are and what factors sustain those relationships. Qualitative data were collected using in-depth interviews with 50 men and women randomly selected from a General Population Cohort. The results showed that managing expectations to sustain marriage is challenging; however the socio-economic and cultural benefits of marriage: having children, property acquisition as well as securing societal status tend to overshadow the costs associated with risks from infidelity such as sexually transmitted infections (including HIV). Recognising the compromises that couples may make to sustain their marriage is an important step towards acknowledging that `being faithful’ may be about staying together and showing commitment, not sexual exclusivity. Keywords: marriage; long-term relationship; HIV epidemic; UgandaLes relations monogames à long terme, sont souvent dépeintes comme une protection dans les campagnes de prévention du VIH. En mettant l'accent sur le mariage dans une communauté dans le sud ouest de l'Ouganda, nous examinons pourquoi et comment les gens entrent dans des relations à long terme, quelles sont leurs attentes et quels facteurs soutiennent ces relations. Les données qualitatives ont été recueillies au moyen d'entrevues en profondeur avec 50 hommes et femmes choisis au hasard à partir d'une population générale cohorte. Les résultats ont montré que la gestion des attentes pour soutenir le mariage est difficile, mais les avantages socio-économiques et culturels du mariage: avoir des enfants, acquis de la propriété ainsi que l’obtention d’un bon état-civil dans la société, ont tendance à éclipser les coûts associés aux risques de l'infidélité telles que les infections sexuellement transmissibles (y compris le VIH). La reconnaissance des compromis que les couples peuvent faire pour soutenir leur mariage, est une étape importante vers la reconnaissance du fait que « être fidèle» peut signifier rester ensemble et de faire preuve de l'engagement, pas l'exclusivité sexuelle. Mots clés: mariage; relation à long terme; Épidémie de VIH; Ougand

Strong ellipticity and spectral properties of chiral bag boundary conditions

We prove strong ellipticity of chiral bag boundary conditions on even dimensional manifolds. From a knowledge of the heat kernel in an infinite cylinder, some basic properties of the zeta function are analyzed on cylindrical product manifolds of arbitrary even dimension.Comment: 16 pages, LaTeX, References adde