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Neutron Star Extreme Matter Observatory: A kilohertz-band gravitational-wave detector in the global network
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- K. Ackley, V. B. Adya, P. Agrawal, P. Altin, G. Ashton, M. Bailes, E. Baltinas, A. Barbuio, D. Beniwal, C. Blair, D. Blair, G. N. Bolingbroke, V. Bossilkov, S. Shachar Boublil, D. D. Brown, B. J. Burridge, J. Calderon Bustillo, J. Cameron, H. Tuong Cao, J. B. Carlin, S. Chang, P. Charlton, C. Chatterjee, D. Chattopadhyay, X. Chen, J. Chi, J. Chow, Q. Chu, A. Ciobanu, T. Clarke, P. Clearwater, J. Cooke, D. Coward, H. Crisp, R. J. Dattatri, A. T. Deller, D. A. Dobie, L. Dunn, P. J. Easter, J. Eichholz, R. Evans, C. Flynn, G. Foran, P. Forsyth, Y. Gai, S. Galaudage, D. K. Galloway, B. Gendre, B. Goncharov, S. Goode, D. Gozzard, B. Grace, A. W. Graham, A. Heger, F. Hernandez Vivanco, R. Hirai, N. A. Holland, Z. J. Holmes, E. Howard, E. Howell, G. Howitt, M. T. Hübner, J. Hurley, C. Ingram, V. Jaberian Hamedan, K. Jenner, L. Ju, D. P. Kapasi, T. Kaur, N. Kijbunchoo, M. Kovalam, R. Kumar Choudhary, P. D. Lasky, M. Y. M. Lau, J. Leung, J. Liu, K. Loh, A. Mailvagan, I. Mandel, J. J. McCann, D. E. McClelland, K. McKenzie, D. McManus, T. McRae, A. Melatos, P. Meyers, H. Middleton, M. T. Miles, M. Millhouse, Y. Lun Mong, B. Mueller, J. Munch, J. Musiov, S. Muusse, R. S. Nathan, Y. Naveh, C. Neijssel, B. Neil, S. W. S. Ng, V. Oloworaran, D. J. Ottaway, M. Page, J. Pan, M. Pathak, E. Payne, J. Powell, J. Pritchard, E. Puckridge, A. Raidani, V. Rallabhandi, D. Reardon, J. A. Riley, L. Roberts, I. M. Romero-Shaw, T. J. Roocke, G. Rowell, N. Sahu, N. Sarin, L. Sarre, H. Sattari, M. Schiworski, S. M. Scott, R. Sengar, D. Shaddock, R. Shannon, J. SHI, P. Sibley, B. J. J. Slagmolen, T. Slaven-Blair, R. J. E. Smith, J. Spollard, L. Steed, L. Strang, H. Sun, A. Sunderland, S. Suvorova, C. Talbot, E. Thrane, D. Töyrä, P. Trahanas, A. Vajpeyi, J. V. van Heijningen, A. F. Vargas, P. J. Veitch, A. Vigna-Gomez, A. Wade, K. Walker, Z. Wang, R. L. Ward, K. Ward, S. Webb, L. Wen, K. Wette, R. Wilcox, J. Winterflood, C. Wolf, B. Wu, M. Jet Yap, Z. You, H. Yu, J. Zhang, J. Zhang, C. Zhao, X. Zhu
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- Journal:
- Publications of the Astronomical Society of Australia / Volume 37 / 2020
- Published online by Cambridge University Press:
- 05 November 2020, e047
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Gravitational waves from coalescing neutron stars encode information about nuclear matter at extreme densities, inaccessible by laboratory experiments. The late inspiral is influenced by the presence of tides, which depend on the neutron star equation of state. Neutron star mergers are expected to often produce rapidly rotating remnant neutron stars that emit gravitational waves. These will provide clues to the extremely hot post-merger environment. This signature of nuclear matter in gravitational waves contains most information in the 2–4 kHz frequency band, which is outside of the most sensitive band of current detectors. We present the design concept and science case for a Neutron Star Extreme Matter Observatory (NEMO): a gravitational-wave interferometer optimised to study nuclear physics with merging neutron stars. The concept uses high-circulating laser power, quantum squeezing, and a detector topology specifically designed to achieve the high-frequency sensitivity necessary to probe nuclear matter using gravitational waves. Above 1 kHz, the proposed strain sensitivity is comparable to full third-generation detectors at a fraction of the cost. Such sensitivity changes expected event rates for detection of post-merger remnants from approximately one per few decades with two A+ detectors to a few per year and potentially allow for the first gravitational-wave observations of supernovae, isolated neutron stars, and other exotica.
Is body weight dissatisfaction associated with depression?
- M. Eichholzer, A. Richard, S. Rohrmann
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- Journal:
- European Psychiatry / Volume 33 / Issue S1 / March 2016
- Published online by Cambridge University Press:
- 23 March 2020, p. S174
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Introduction
Body image dissatisfaction is a risk factor for depression. Research has focused on female adolescents; yet little is known about sex and age differences.
Objectives/aimsThe aim of our study was to evaluate the association of body weight dissatisfaction, a component of body image, with depression overall, and for different sex and age-groups independent of body weight.
MethodsWe analyzed data of 15,975 individuals from the cross-sectional 2012 Swiss Health Survey. Participants were asked about their weight satisfaction. Patient Health Questionnaire (PHQ-9) was used to ascertain depression. Age was stratified in three groups (≥ 18-29; ≥ 30-59; ≥ 60 years). Body mass index (BMI) was self-reported and categorized into normal weight (BMI: 18.5-24.9 kg/m2), overweight (BMI: 25.0-29.9 kg/m2), and obesity (BMI: ≥ 30 kg/m2). The association between weight dissatisfaction and depression was assessed with logistic regression analyses and adjusted for known confounders (including BMI).
ResultsWeight dissatisfaction was associated with depression in the overall group (OR: 2.04, 95% CI: 1.66-2.50) and in men (1.85, 1.34-2.56) and women (2.25, 1.71-2.96) separately, independent of body weight (multivariable adjusted). Stratification by age groups revealed associations of weight dissatisfaction with depression in young (1.78, 1.16-2.74), middle-aged (2.1, 1.61-2.74) and old individuals (2.34, 1.30-4.23) independent of BMI. A sub-analysis in the overall group revealed statistically significant positive associations of weight dissatisfaction with depression in underweight, normal weight, overweight and obese individuals.
ConclusionBody weight dissatisfaction is associated with depression in men, women, young, middle-aged and old individuals independent of BMI.
Disclosure of interestThe authors have not supplied their declaration of competing interest.
Loneliness is adversely associated with lifestyle and physical and mental health
- A. Richard, S. Rohrmann, C.L. Vandeleur, M. Schmid, M. Eichholzer
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- Journal:
- European Psychiatry / Volume 33 / Issue S1 / March 2016
- Published online by Cambridge University Press:
- 23 March 2020, p. S82
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Introduction
Loneliness is a common emotional distress experience and there is increasing evidence of associations with unhealthy lifestyle and adverse health-related factors. Little is known about age and sex as potential effect modifiers, and about the prevalence of loneliness.
Objective/aimsTo assess the associations of loneliness with behavioral, physical and mental health factors, taking sex and age into account and to examine the prevalence of loneliness in individuals aged 15+ years.
MethodsData from 20,007 participants of the cross-sectional population-based Swiss Health Survey 2012 were analyzed. The association of loneliness with lifestyle and health-related factors were assessed with logistic regression analyses. Wald tests were used to test for age and sex differences.
ResultsLoneliness was reported by 64.1% of individuals, and was associated with smoking (OR 1.13, 95% CI 1.05–1.23), physical inactivity (1.20, 1.10–1.31), non-adherence to the 5-a-day recommendation for fruit and vegetable consumption (1.21, 1.07–1.37), and more visits to a physician within the last year (1.29, 1.17–1.42). Loneliness was also associated with high cholesterol levels (1.31, 1.18–1.45), diabetes (1.40, 1.16–1.67), self-reported chronic diseases (1.41, 1.30–1.54), impaired self-perceived health (1.94, 1.74–2.16), moderate and high psychological distress (3.74, 3.37–4.16), and depression (2.78, 2.22–3.48). Age modulated the associations in BMI, smoking, visiting a physician within the past year, and self-perceived health. Sex did generally not modulate the associations.
ConclusionLoneliness is associated with unhealthy lifestyle, and poorer physical and mental health. Associations were modulated by age, but not sex. Further longitudinal studies are needed to elucidate the causal relationships of these associations.
Disclosure of interestThe authors have not supplied their declaration of competing interest.
Monolithic Integration of III-V Microcavity Leds on Silicon Drivers using Conformal Epitaxy
- B. Gérard, X. Marcadet, P. Etienne, D. Pribat, D. Friedrich, J. Eichholz, H. Bemt, H. Hanssen, J-F. Carlin, M. Ilegems
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- Journal:
- MRS Online Proceedings Library Archive / Volume 535 / 1998
- Published online by Cambridge University Press:
- 10 February 2011, 139
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- 1998
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Conformal epitaxy is an epitaxial growth technique capable of yielding low dislocation density III-V films on Silicon. In this technique, the growth of the III-V material occurs parallel to the silicon substrate, from the edge of a previously deposited III-V seed, the vertical growth being stopped by an overhanging capping layer. As an example, conformal GaAs layers on Silicon, presenting dislocation densities below 105cm−2, have been obtained using selective vapor phase epitaxy. These layers have then been used as high quality GaAs on Si substrates for subsequent vertical MBE regrowth of active structures. In this paper, we report on the integration of surface-emitting microcavity LEDs with their silicon drivers using this conformal growth technique. The global technology concept and the design of the active structures are first presented. The compatibility of the conformal growth technique with CMOS technology is then checked: the impact of the integration process on the performances of the drivers is for example quantified. Characterisations of the high crystalline quality of the conformal layers and of the LEDs structures grown on it are then shown. The electro-optical characteristics of the LEDs on Si are finally compared to those of reference LEDs on GaAs substrates in order to prove the efficiency of the integration procedure.