Abstract Purpose To assess changes in self-reported intimate partner violence (IPV) experience from adolescence through young adulthood. To examine whether individual change in indicators of ...relationship context—qualities and dynamics of the relationship, changes in partners, and relationship type (dating, cohabiting, and married)—were associated with change in self-reports of IPV. Methods Drawing on longitudinal population-based data, the Toledo Adolescent Relationships Study, we used fixed-effects models to estimate within-person change in associations between features of respondents' intimate relationships and the proportion of relationships with IPV from adolescence through young adulthood. Analyses focused on 1,146 young men and women ages 13–29 years (51% female). Items measuring IPV were from the Conflict Tactics Scale. Results More than half of respondents (53%) experienced discontinuity in IPV across relationships. Among those reporting violence, the vast majority (87%) did not experience violence in all of their relationships. Age-related patterns were similar for men and women with IPV peaking in young adulthood. Infidelity, frequency of disagreements, and partner continuity were associated with a higher proportion of relationships with IPV. Improvements in the nature and character of romantic relationships were associated with a lower accumulation of IPV experiences. Conclusions IPV, although prevalent, does not represent a consistent experience. As young adults develop higher quality relationships they move toward desistance from IPV. Yet, variability in these experiences is observed, supporting previous calls for programs that promote the development of healthy relationships among adolescents and young adults.
Context. The ESO public survey VISTA variables in the Vía Láctea (VVV) started in 2010. VVV targets 562 sq. deg in the Galactic bulge and an adjacent plane region and is expected to run for about ...five years. Aims. We describe the progress of the survey observations in the first observing season, the observing strategy, and quality of the data obtained. Methods. The observations are carried out on the 4-m VISTA telescope in the ZYJHKs filters. In addition to the multi-band imaging the variability monitoring campaign in the Ks filter has started. Data reduction is carried out using the pipeline at the Cambridge Astronomical Survey Unit. The photometric and astrometric calibration is performed via the numerous 2MASS sources observed in each pointing. Results. The first data release contains the aperture photometry and astrometric catalogues for 348 individual pointings in the ZYJHKs filters taken in the 2010 observing season. The typical image quality is ~ \hbox{$0\farcs9{-}1\farcs0$} 0 . ″ 9 − 1 . ″ 0 . The stringent photometric and image quality requirements of the survey are satisfied in 100% of the JHKs images in the disk area and 90% of the JHKs images in the bulge area. The completeness in the Z and Y images is 84% in the disk, and 40% in the bulge. The first season catalogues contain 1.28 × 108 stellar sources in the bulge and 1.68 × 108 in the disk area detected in at least one of the photometric bands. The combined, multi-band catalogues contain more than 1.63 × 108 stellar sources. About 10% of these are double detections because of overlapping adjacent pointings. These overlapping multiple detections are used to characterise the quality of the data. The images in the JHKs bands extend typically ~4 mag deeper than 2MASS. The magnitude limit and photometric quality depend strongly on crowding in the inner Galactic regions. The astrometry for Ks = 15−18 mag has rms ~35−175 mas. Conclusions. The VVV Survey data products offer a unique dataset to map the stellar populations in the Galactic bulge and the adjacent plane and provide an exciting new tool for the study of the structure, content, and star-formation history of our Galaxy, as well as for investigations of the newly discovered star clusters, star-forming regions in the disk, high proper motion stars, asteroids, planetary nebulae, and other interesting objects.
Studies of teen dating violence have focused heavily on family and peer influences, but little research has been conducted on the relationship contexts within which violence occurs. The present study ...explores specific features of adolescent romantic relationships associated with the perpetration of physical violence. Relying on personal interviews with a sample of 956 adolescents, results indicate that respondents who self-report violence perpetration are significantly more likely than their non-violent counterparts to report higher levels of other problematic relationship dynamics and behaviors such as jealousy, verbal conflict, and cheating. However, we find no significant differences in levels of love, intimate self-disclosure, or perceived partner caring, and violent relationships are, on average, characterized by longer duration, more frequent contact, sexual intimacy and higher scores on the provision and receipt of instrumental support. Finally, violence is associated with the perception of a relatively less favorable power balance, particularly among male respondents. These findings complicate traditional views of the dynamics within violent relationships, add to our understanding of risk factors, and may also shed light on why some adolescents remain in physically abusive relationships.
The dominant seagrass in Port Phillip Bay (PPB), Australia, Zostera nigricaulis, declined between 2000 and 2011, coinciding with the 'Millennium drought' that ended in 2009. These seagrasses are ...nitrogen-limited, underpinning the need to develop nitrogen budgets for better ecosystem management. Environmentally realistic measurements of specific uptake rates and resource allocation were undertaken to develop nitrogen budgets and test the hypothesis that the above-ground and below-ground compartments are able to re-mobilise ammonium and nitrate through uptake, translocation and assimilation to adapt to varying levels of nitrogen in the ecosystem. Uptake of
N labelled ammonium and nitrate by above- and below-ground seagrass biomass, epiphytes and phytoplankton was quantified in chambers in situ. Preferential uptake of ammonium over nitrate was observed, where the uptake rate for nitrate was about one sixth of that for ammonium. Epiphytes and phytoplankton also registered an increased affinity for ammonium over nitrate. Translocation experiments demonstrated the uptake by both the above-ground and below-ground biomass, respectively from the water column and pore water, and subsequent translocation to the opposite compartment. Acropetal translocation (below- to above-ground biomass) was more prevalent than basipetal translocation. This is a unique outcome given basipetal translocation has been widely reported for Zostera by other researchers.
Recent studies have highlighted persistent differentials in income pooling (whether couples combine their earnings or keep their money separate) between married and cohabiting couples. The theories ...guiding research on income pooling suggest that couples pool their incomes for a variety of reasons, including increasing interdependence and growing commitment, but it is also likely that couples pool their incomes to pay for intra-household needs and avoid financial difficulties and material hardship. Using the Toledo Adolescent Relationships Study (TARS) (N = 517), we examined the associations between income pooling and measures of commitment and material hardship among married and cohabiting young adults (ages 22–29). Results show that increasing levels of commitment were associated with higher odds of completely income pooling, regardless of union status. Further, the odds of complete income pooling rose with increasing material hardship. However, the married-cohabiting gap in income pooling persisted after controlling for demographic factors, employment characteristics, and relationship characteristics: married young adults had significantly higher odds of income pooling than cohabiting young adults. Standardized estimates reveal that, although there are significant differences in commitment and material hardship between married and cohabiting young adults, these compositional differences do not drive the married-cohabiting income pooling gap. Instead, there are differences in role of commitment and material hardship for these young couples. Overall, results suggest that income pooling behavior is both an indicator of commitment and a strategy to manage economic hardship among married and cohabiting young adults in the U.S. These findings provide new insights into how young adults may navigate commitment and financial concerns within their intimate relationships.
Reductions in the extent of seagrass Zostera nigricaulis coverage in Port Phillip Bay (PPB), Australia, between 2000 and 2011 coincided with a prolonged period of drought (1997 to 2009) characterized ...by decreases in freshwater and nutrient inputs. This led us to hypothesize that patterns of seagrass expansion and decline in PPB may be linked to nutrient availability. Seagrasses in PPB can make use of a range of different nitrogen (N) sources depending on their relative availability. Accordingly, there is a need to identify the origin of the N utilised by seagrasses in order to understand how changes in the availability of nutrients from various sources may influence seagrass growth. This study used stable isotope analysis to estimate the contribution of different sources of N to seagrass growth in different parts of PPB. Source modelling indicated that regional patterns of N source utilisation matched changes in seagrass extent from 2000 to 2011. Regions in which seagrass declined contained a similar array of sources, including significant contributions from the catchment area, whereas regions where seagrass areas remained unchanged were largely dependent on a single N source (either fixation/recycled or sewage-derived). We propose that reductions in N from the catchment during the drought may have contributed to the decline of seagrasses in regions where N from the catchment is an important source. This finding is likely to have implications for the growth, distribution and resilience of Z. nigricaulis seagrass in PPB as well as in other parts of its range in southern Australia.
The UKIDSS Galactic Plane Survey Lucas, P. W.; Hoare, M. G.; Longmore, A. ...
Monthly Notices of the Royal Astronomical Society,
11/2008, Letnik:
391, Številka:
1
Journal Article
Recenzirano
Odprti dostop
The UKIDSS Galactic Plane Survey (GPS) is one of the five near-infrared Public Legacy Surveys that are being undertaken by the UKIDSS consortium, using the Wide Field Camera on the United Kingdom ...Infrared Telescope. It is surveying 1868 deg2 of the northern and equatorial Galactic plane at Galactic latitudes −5° < b < 5° in the J, H and K filters and a ∼200-deg2 area of the Taurus–Auriga–Perseus molecular cloud complex in these three filters and the 2.12 μm (1–0) H2 filter. It will provide data on ∼2 × 109 sources. Here we describe the properties of the data set and provide a user's guide for its exploitation. We also present brief Demonstration Science results from DR2 and from the Science Verification programme. These results illustrate how GPS data will frequently be combined with data taken in other wavebands to produce scientific results. The Demonstration Science comprises six studies. (1) A GPS-Spitzer-GLIMPSE cross-match for the star formation region G28.983−0.603 to identify YSOs. This increases the number of YSOs identified by a factor of 10 compared to GLIMPSE alone. (2) A wide-field study of the M17 nebula, in which an extinction map of the field is presented and the effect of source confusion on luminosity functions in different subregions is noted. (3) H2 emission in the ρ Ophiuchi dark cloud. All the molecular jets are traced back to a single active clump containing only a few protostars, which suggests that the duration of strong jet activity and associated rapid accretion in low-mass protostars is brief. (4) X-ray sources in the nuclear bulge. The GPS data distinguishes local main-sequence counterparts with soft X-ray spectra from nuclear bulge giant counterparts with hard X-ray spectra. (5) External galaxies in the zone of avoidance. The galaxies are clearly distinguished from stars in fields at longitudes l > 90°. (6) IPHAS-GPS optical–infrared spectrophotometric typing. The (i′−J) versus (J−H) diagram is used to distinguish A–F type dwarfs, G dwarfs, K dwarfs and red clump giants in a field with high reddening.
Context. A new challenging adaptive optics (AO) system, called multi-object adaptive optics (MOAO), has been successfully demonstrated on-sky for the first time at the 4.2 m William Herschel ...Telescope, Canary Islands, Spain, at the end of September 2010. Aims. This system, called CANARY, is aimed at demonstrating the feasibility of MOAO in preparation of a future multi-object near infra-red (IR) integral field unit spectrograph to equip extremely large telescopes for analysing the morphology and dynamics of high-z galaxies. Methods. CANARY compensates for the atmospheric turbulence with a deformable mirror driven in open-loop and controlled through a tomographic reconstruction by three widely separated off-axis natural guide star (NGS) wavefront sensors, which are in open loop too. We compared the performance of conventional closed-loop AO, MOAO, and ground-layer adaptive optics (GLAO) by analysing both IR images and simultaneous wave-front measurements. Results. In H-band, Strehl ratios of 0.20 are measured with MOAO while achieving 0.25 with closed-loop AO in fairly similar seeing conditions (r0 ≈ 15 cm at 0.5 μm). As expected, MOAO has performed at an intermediate level between GLAO and closed-loop AO.
VLT-MAD observations of the core of 30 Doradus Campbell, M. A.; Evans, C. J.; Mackey, A. D. ...
Monthly notices of the Royal Astronomical Society,
06/2010, Letnik:
405, Številka:
1
Journal Article
Recenzirano
Odprti dostop
We present H- and Ks-band imaging of three fields at the centre of 30 Doradus (30 Dor) in the Large Magellanic Cloud, obtained as part of the Science Demonstration programme with the Multiconjugate ...Adaptive optics Demonstrator (MAD) at the Very Large Telescope. Strehl ratios of 15–30 per cent were achieved in the Ks band, yielding near-infrared images of this dense and complex region at unprecedented angular resolution at these wavelengths. The MAD data are used to construct a near-infrared luminosity profile for R136, the cluster at the core of 30 Dor. Using cluster profiles of the form used by Elson et al., we find the surface brightness can be fit by a relatively shallow power-law function (γ∼ 1.5–1.7) over the full extent of the MAD data, which extends to a radius of ∼40 arcsec (∼10 pc). We do not see compelling evidence for a break in the luminosity profile as seen in optical data in the literature, arguing that cluster asymmetries are the dominant source, although extinction effects and stars from nearby triggered star formation likely also contribute. These results highlight the need to consider cluster asymmetries and multiple spatial components in interpretation of the luminosity profiles of distant unresolved clusters. We also investigate seven candidate young stellar objects reported by Gruendl & Chu from Spitzer observations, six of which have apparent counterparts in the MAD images. The most interesting of these (053839.24−690552.3) appears related to a striking bow-shock-like feature, orientated away from both R136 and the Wolf–Rayet star Brey 75, at distances of 19.5 and 8 arcsec (4.7 and 1.9 pc in projection), respectively.
While current evidence indicates that the United States did not experience a baby boom during the pandemic, few empirical studies have considered the underlying rationale for the American baby bust. ...Relying on data collected during the pandemic (
= 574), we find that pandemic-related subjective assessments (e.g., self-reported stress, fear of COVID-19 and relationship struggles) and not economic indicators (e.g., employment status, income level) were related to levels of fertility motivations among individuals in relationships. Analysis of within-person changes in fertility motivations shows that shifts in the number of children, increases in mental health issues and increases in relationship uncertainty, rather than changes in economic circumstances, were associated with short-term assessments of the importance of avoiding a pregnancy. We argue for broadening conceptual frameworks of fertility motivations by moving beyond a focus on economic factors to include a cognitive schema that takes subjective concerns into account.
PDF
