ACKNOWLEDGING THE COMPLEXITY OF PROCESSES LEADING TO FOSTER CARE BREAKDOWN

Family-based solutions for children in care are the preferred option in European countries on the grounds of both cost and quality. Yet, too often, foster care placements intended to be long term are terminated unexpectedly early. Few studies have identified factors leading to unexpected breakdown and fewer still have translated such findings into practical guidance for professionals. This article outlines: (a) the ambiguity and contradictions in the use of terminology (e.g., instability, breakdown, disruption) in several international studies; (b) the adoption of a one-sided, file-based, systemic perspective in recent studies of foster care instability, breakdown, and disruption; and (c) empirical data collected from interviews with foster children. Foster care breakdown is shown to be a process that takes place on several levels. In addition to the actual breakdown event, the situation of the child before the placement, the situation during the placement, the emergence and development of the crisis and the consequences of the breakdown for all those involved are all part of the process. It is only in retrospect that the ending of a foster care process is perceived as a breakdown. Assessments of whether it was planned or unplanned, expected or unexpected, and desirable or undesirable are meaningful only from an individual perspective. Such a perspective must be clearly identified: different people experience and remember the same breakdown in different ways, and its significance for their personal biographies may vary.

Seasonal Persistence of Circulation Anomalies in the Southern Hemisphere Stratosphere and Its Implications for the Troposphere

Previous studies have highlighted an important organizing influence of the seasonal Southern Hemisphere stratospheric vortex breakdown on the large-scale stratospheric and tropospheric circulation. The present study extends this work by considering the statistical predictability of the stratospheric vortex breakdown event, using reanalysis data. Perturbations to the winter stratospheric vortex are shown to persist into austral spring and to lead to a shift in the statistics of the breakdown event during austral summer. This is interpreted as evidence for the potential for seasonal predictability of the vortex breakdown event in the stratosphere. Coupled variability between the stratosphere and troposphere is then considered. The semiannual oscillation of the tropospheric midlatitude jet is discussed, and evidence for a connection between this behavior and variations in the stratosphere is presented. Based on this connection, an argument is made for the concomitant potential for seasonal predictability in the troposphere, assuming knowledge of the stratospheric initial state. Combining these various results, a nonstationary, regime-based perspective of large-scale extratropical Southern Hemisphere circulation variability between late winter and summer is proposed. The implications of this perspective for some previous studies involving annular modes of the circulation are discussed. In particular, the long annular mode time scales during austral spring and summer should not be interpreted as an increased persistence of perturbations to some slowly varying seasonal cycle, but instead as a reflection of a phase shift of the seasonal cycle induced by stratospheric variability.

The chemistry of daytime sprite streamers – a model study

The chemical processes in daytime sprite streamers in the altitude range of 30–54 km are investigated by means of a detailed ion-neutral chemistry model (without consideration of transport). The model results indicate that ozone perturbations due to daytime sprites streamers differ considerably from the ones of nighttime events. Due to liberation of atomic oxygen there is an initial increase of ozone. In terms of relative ozone change, this effect decreases with altitude. While for nighttime conditions, reactive nitrogen produced during the electric breakdown is converted into less reactive NO2, in the sunlit atmosphere NOx causes catalytic ozone destruction. As a consequence, there is significant ozone loss in sprite streamers in the daytime atmosphere, in particular at higher altitudes. At an altitude of 54 km, ozone in the streamer column has decreased by about 15% fifteen minutes after the breakdown event.

Breakdown Characteristics of Ultra-Thin Gate Oxides Caused by Plasma Charging

ABSTRACTBreakdown characteristics of ultra-thin gate oxides caused by plasma charging were studied in this work. It is observed that as oxide thickness is scaled down to 4 nm, some traditional monitor parameters may lose their sensitivity for detecting oxide degradation induced by plasma charging damage, due to insignificant trap generation. Even the gate leakage current, although sensitive for 4 nm oxide, may no longer be sensitive enough for even thinner oxide (e.g., 2.6 nm), due to the existence of large tunneling current. Moreover, several soft-breakdown events were found to occur in ultrathin oxide before the final onset of a catastrophic hard-breakdown. Finally, an equivalent local oxide thickness is calculated using local oxide thinning model to estimate the stepwise increase of gate current after soft-breakdown event.