The significance of insecure attachment and disorganization in the development of children's externalizing behavior: A meta-analytic study

This study addresses the extent to which insecure and disorganized attachments increase risk for externalizing problems using meta-analysis. From 69 samples (N = 5,947), the association between insecurity and externalizing problems was significant, d = 0.31 (95% CI: 0.23, 0.40). Larger effects were found for boys (d = 0.35), clinical samples (d = 0.49), and from observation-based outcome assessments (d = 0.58). Larger effects were found for attachment assessments other than the Strange Situation. Overall, disorganized children appeared at elevated risk (d = 0.34, 95% CI: 0.18, 0.50), with weaker effects for avoidance (d = 0.12, 95% CI: 0.03, 0.21) and resistance (d = 0.11, 95% CI: −0.04, 0.26). The results are discussed in terms of the potential significance of attachment for mental health

Intergenerational transmission of attachment: A move to the contextual level

Wetensch. publ. non-refereedFaculteit der Sociale Wetenschappe

Adult attachment and the break-up of romantic relationships

Wetensch. publ. refereedFaculteit der Sociale Wetenschappe

Scattering amplitudes of massive Nambu-Goldstone bosons

Massive Nambu-Goldstone (mNG) bosons are quasiparticles whose gap is determined exactly by symmetry. They appear whenever a symmetry is broken spontaneously in the ground state of a quantum many-body system, and at the same time explicitly by the system's chemical potential. In this paper, we revisit mNG bosons and show that apart from their gap, symmetry also protects their scattering amplitudes. Just like for ordinary gapless NG bosons, the scattering amplitudes of mNG bosons vanish in the long-wavelength limit. Unlike for gapless NG bosons, this statement holds for any scattering process involving one or more external mNG states; there are no kinematic singularities associated with the radiation of a soft mNG boson from an on-shell initial or final state.Comment: 12 pages; v2: added discussion of the double-soft limit in response to the referee report; matches version published in PR

Measurement of vibroacoustical energy flow through straight pipes

The measurement of vibroacoustical energy flow through straight pipes has been investigated. At frequencies below the cut-on of n=3 shell waves the energy propagates in a limited number of waves. The stnicture-borne energy in these waves can be determined from acceleration measurements on the pipe surface, provided that appropriate accelerometer configurations are chosen to separate the different waves. The energy flow in each wave can then be determined using a two-channel cross-spectral density method. It appears to be impossible to determine the fluid-borne energy flow from acceleration measurements, due to the transverse axis sensitivity of the accelerometers. Experiments on a cooling water pipe of a shipboard diesel engine indicate that energy flow measurements are feasible, although further investigations are necessary to achieve a practicable and reliable method