The impact of cessation or continuation of family violence on children

Children exposed to family violence are at risk for developing long-lasting problems. Family violence is a pervasive problem, however, studies comparing continuation with cessation of family violence are limited. Understanding the cessation or continuation of family violence on child development is a prerequisite to prevent enduring problems and develop interventions. This study compares posttraumatic stress and delinquent behavior of children aged between eight and eighteen years for whom severe violence continues to children for whom violence diminishes or ceases. Children (N = 162, 43% boys, mean age 12 years) and their parents reported to child protection services (CPS) with severe violence were included. Levels of family violence, posttraumatic stress and delinquent behavior were re-assessed after 18 months. Most families (74%) still experienced severe family violence at the second assessment despite involvement of CPS. Structural equation modelling was applied. In the group where violence diminished or stopped, delinquent behavior decreased. A decrease of posttraumatic stress only occurred when violence diminished but surprisingly no decrease was observed when violence stopped completely. The findings demonstrate that overall family violence is persistent. Differing paths can be discerned for delinquent behavior and posttraumatic stress, indicating different developmental and recovery pathways after cessation of family violence. Nonetheless, it is fair to state that specialized and long-term care is crucial

The local density of optical states of a metasurface

While metamaterials are often desirable for near-field functions, such as perfect lensing, or cloaking, they are often quantified by their response to plane waves from the far field. Here, we present a theoretical analysis of the local density of states near lattices of discrete magnetic scatterers, i.e., the response to near field excitation by a point source. Based on a pointdipole theory using Ewald summation and an array scanning method, we can swiftly and semi-analytically evaluate the local density of states (LDOS) for magnetoelectric point sources in front of an infinite two-dimensional (2D) lattice composed of arbitrary magnetoelectric dipole scatterers. The method takes into account radiation damping as well as all retarded electrodynamic interactions in a self-consistent manner. We show that a lattice of magnetic scatterers evidences characteristic Drexhage oscillations. However, the oscillations are phase shifted relative to the electrically scattering lattice consistent with the difference expected for reflection off homogeneous magnetic respectively electric mirrors. Furthermore, we identify in which source-surface separation regimes the metasurface may be treated as a homogeneous interface, and in which homogenization fails. A strong frequency and in-plane position dependence of the LDOS close to the lattice reveals coupling to guided modes supported by the lattice

The impact of cessation or continuation of family violence on children

Children exposed to family violence are at risk for developing long-lasting problems. Family violence is a pervasive problem, however, studies comparing continuation with cessation of family violence are limited. Understanding the cessation or continuation of family violence on child development is a prerequisite to prevent enduring problems and develop interventions. This study compares posttraumatic stress and delinquent behavior of children aged between eight and eighteen years for whom severe violence continues to children for whom violence diminishes or ceases. Children (N = 162, 43% boys, mean age 12 years) and their parents reported to child protection services (CPS) with severe violence were included. Levels of family violence, posttraumatic stress and delinquent behavior were re-assessed after 18 months. Most families (74%) still experienced severe family violence at the second assessment despite involvement of CPS. Structural equation modelling was applied. In the group where violence diminished or stopped, delinquent behavior decreased. A decrease of posttraumatic stress only occurred when violence diminished but surprisingly no decrease was observed when violence stopped completely. The findings demonstrate that overall family violence is persistent. Differing paths can be discerned for delinquent behavior and posttraumatic stress, indicating different developmental and recovery pathways after cessation of family violence. Nonetheless, it is fair to state that specialized and long-term care is crucial

Sticky prices in the euro area: a summary of new micro-evidence

This paper summarises the vast evidence on micro price-setting recently obtained for euro area countries. We consider studies with micro data on consumer and producer prices, as well as survey information. The main findings are: (1) prices in the euro area are sticky and stickier than in the US; (2) downward price rigidity is only slightly more marked than upward price rigidity; (3) heterogeneity and asymmetries are observed in price-setting; and (4) the relevance of theories that explain price stickiness, such as implicit or explicit contracts, marginal costs, and coordination failure, is confirmed, whereas menu costs, pricing thresholds, and costly information explanations are judged much less relevant by firms. (JEL: C25, D40, E31

Population difference study of few-cycle laser pulse propagating in near-resonant two-level atom medium

We have theoretically studied the propagation of few-cycle laser pulse in near-resonant two-level atom medium by solving Maxwell-Bloch equations with a predictor-corrector finite-difference time-domain method. Hyperbolic secant pulses with area 2π, 4π and 6π are adopted as the initial inputs. For large pulse area, the carrier-wave Rabi flopping occurs in the faster split 2π pulse and causes spectra broadening which subsequently increases the induced population difference. Combined with the contribution of periodically varying carrier-envelop phase, the maximum of population difference gives rise to an interesting phenomenon

Determining the internal quantum efficiency of shallow-implanted nitrogen-vacancy defects in bulk diamond

It is generally accepted that nitrogen-vacancy (NV) defects in bulk diamond are bright sources of luminescence. However, the exact value of their internal quantum efficiency (IQE) has not been measured so far. Here we use an implementation of Drexhage's scheme to quantify the IQE of shallow-implanted NV defects in a single-crystal bulk diamond. Using a spherical metallic mirror with a large radius of curvature compared to the optical spot size, we perform calibrated modifications of the local density of states around NV defects and observe the change of their total decay rate, which is further used for IQE quantification. We also show that at the excitation wavelength of 532 nm, photo-induced relaxation cannot be neglected even at moderate excitation powers well below the saturation level. For NV defects shallow implanted 4.5 ± 1 and 8 ± 2 nm below the diamond surface, we determine the quantum efficiency to be 0.70 ± 0.07 and 0.82 ± 0.08, respectively