Two-Stage Cryogenic HEMT Based Amplifier For Low Temperature Detectors

To search for dark matter candidates with masses below $\mathcal{O}$(MeV), the SPLENDOR (Search for Particles of Light dark mattEr with Narrow-gap semiconDuctORs) experiment is developing novel narrow-bandgap semiconductors with electronic bandgaps on the order of 1-100 meV. In order to detect the charge signal produced by scattering or absorption events, SPLENDOR has designed a two-stage cryogenic HEMT-based amplifier with an estimated charge resolution approaching the single-electron level. A low-capacitance ($\sim$1.6 pF) HEMT is used as a buffer stage at $T=10\,\mathrm{mK}$ to mitigate effects of stray capacitance at the input. The buffered signal is then amplified by a higher-capacitance ($\sim$200 pF) HEMT amplifier stage at $T=4\,\mathrm{K}$. Importantly, the design of this amplifier makes it usable with any insulating material - allowing for rapid prototyping of a variety of novel detector materials. We present the two-stage cryogenic amplifier design, preliminary voltage noise performance, and estimated charge resolution of 7.2 electrons.Comment: 4 pages, 3 figures, 1 table, conference proceedings for LTD2

Reproductive health and lifestyle factors associated with health-related quality of life among perinatally HIV-infected adolescents in Uganda

Background With increased survival of perinatally HIV - infected adolescents due to antiretroviral therapy (ART), the focus of HIV care has shifted to health-related quality of life (HRQoL) as a measure of disease progression, effects of ART co-morbidity and prognosis. We assessed factors associated with better HRQoL in perinatally HIV -infected adolescents in Uganda by determining the associations between sexual and reproductive health (SRH) or lifestyle experiences on HRQoL. Methods In a cross-sectional study, data on SRH, lifestyle experiences, socio demographic factors, communication with parents on sexuality and satisfaction of SRH services in ART clinics were collected from 614 HIV perinatally infected adolescents aged 10–19 using an interviewer-administered survey questionnaire. HRQoL data were collected using the Medical Outcomes Study HIV Health Survey instrument (MOS-HIV). Factors associated with better HRQoL were analysed using multiple logistic regression. Results The mean age was 16.2 ± 2.1 years, 362 (58.8 %) were females and 210 (34.2 %) were sexually active. Adolescents on ART were twice likely to present with better physical health (AOR = 2.07, 95 % CI: 1.24–3.46) and four times more likely to present with better mental health (AOR = 3.9, 95 % CI: 2.22–6.92) than those who were not on ART. There were no statistically significant associations between SRH (ever had sex, ever been pregnant, condom use, contraceptive use) or life style factors and physical health or mental health. Those with secondary or tertiary education were more likely to present with a better mental health (AOR = 5.3, 95 % CI: 1.86–15.41) compared those who had attained primary or no education. Participants who desired to have a child in future more likely (AOR 1.7, 95 % CI: 1.05–3.00) to present with a better mental health. Lack of communication with guardians on sexuality (AOR = 0.6, 95 % CI: 0.40–0.89), or dissatisfaction with SRH services (AOR 0.34, 95 % CI: 0.18–0.62) were associated with poorer mental health. Conclusion Among perinatally HIV-infected adolescents in Uganda, being on ART was associated with better physical and mental health while lack of communication with guardians on sexuality or dissatisfaction with SRH services was associated with poor mental health. Adolescents with pregnancy intentions were more likely to have a better mental health

Performance of the ATLAS electromagnetic calorimeter end-cap module 0

The construction and beam test results of the ATLAS electromagnetic end-cap calorimeter pre-production module 0 are presented. The stochastic term of the energy resolution is between 10% GeV^1/2 and 12.5% GeV^1/2 over the full pseudorapidity range. Position and angular resolutions are found to be in agreement with simulation. A global constant term of 0.6% is obtained in the pseudorapidity range 2.5 eta 3.2 (inner wheel)

Construction, assembly and tests of the ATLAS electromagnetic barrel calorimeter

The construction and assembly of the two half barrels of the ATLAS central electromagnetic calorimeter and their insertion into the barrel cryostat are described. The results of the qualification tests of the calorimeter before installation in the LHC ATLAS pit are given

Not letting the disease get the upper hand over life: strategies of teens with asthma

Adolescence is a period when teens normally revolt against being dependent. For teens with asthma this period may be even more difficult to deal with, as they also have to deal with their illness. Since few studies describe this phenomenon, the aim of this study was to provide a theoretical understanding of how teens with asthma manage their everyday life in relation to their disease. A grounded theory research design, according to Glaser, was used to uncover the phenomenon. The study was undertaken at a camp for teenagers with asthma during the summer of 2003. Twelve girls and 11 boys with moderate to severe asthma participated in the study. Participant observations and interviews were used, and the first author collected the data and participated in the activities. The findings reveal a theoretical model which shows that teens' core concern is not to let the disease get the upper hand over life. To manage this core concern the teens were found to use three strategies: keeping a distance to the disease, challenging the disease and taking the disease into consideration. Boys mainly kept a distance to the disease while girls mainly kept the disease into consideration. Challenging the disease seemed to be a strategy used by both girls and boys. The teens' strategies were not studied close to their everyday life, but a conclusion drawn from our study was that the provisional theory in many respects can be transferred to their everyday life, even though further research is needed to develop this provisional theory in other settings

Transnational migration, changing care arrangements and left-behind children's responses in South-east Asia

The authors are grateful to the Wellcome Trust, UK, for funding the CHAMPSEA project [GR079946/B/06/Z and GR079946/Z/06/Z], Asia Research Institute for funding the conference ‘Inter-Asia Roundtable 2010 – Transnational Migration and Children in Asian Contexts' where this paper was first presented and Singapore Ministry of Education Academic Research Fund Tier 1 (R-109-000-156-112) for supporting the work behind the publication of this paper.Recent increases in the volume of labour migration from South-east Asia – and in particular the feminisation of these movements – suggest that millions of children are growing up in transnational families, separated from their migrant parents. Drawing on both quantitative and qualitative data collected in Indonesia, the Philippines, Thailand and Vietnam, the study seeks to elucidate care arrangements for left-behind children and to understand the ways in which children respond to shifts in intimate family relations brought about by (re)configurations of their care. Our findings emphasise that children, through strategies of resistance, resilience and reworking, are conscious social actors and agents of their own development, albeit within constrained situations resulting from their parents’ migration.Publisher PDFPeer reviewe

"The good child": anthropological perspectives on morality and childhood (Introduction to Special Issue)

Currently, there is no clearly delineated field that could be described as ‘the anthropology of morality’. There exists, however, an increasingly visible and vocal interest in issues of morality among anthropologists. Although there has been a lack of explicit study, it has become clear that anthropologists have, in fact, been concerned with issues of moralities all along. The purpose of this special issue is to bring this interest to ethnographic studies of childhood, and explore how and why children or young people act in a particular way and are making certain choices, how these are valued or contested by their families, peers, and communities. The papers in this special issue highlight the contestations that arise as multiple moralities collide, and the effects this may have for the persons involved. Collectively, the papers illustrate a notion of moralities as multiple, contested, and mobile, and the consequences this may have in a globalising world