Layer misregistration in PCB and its effects on signal propagation
Layer misregistration is one of the common issues in PCB manufacturing processes. In addition to physical limitations of manufacturability (large via pad/anti-pad), it may also have impact on the electrical performance of signal lines running through via fields with anti-pad openings. In order to quantify its effects on signal propagation, comprehensive test vehicles were designed, measured, and analyzed. Significant increases in layer-to-layer crosstalk and common-to-differential mode conversion were observed, when corresponding layers were misaligned. The results helped understand the mechanisms, validate modeling methodology, and define design rules.
Constructing 3D package component broadband electrical models with correct DC values
Accurate channel simulations of package interconnections require passive and causal models that faithfully represent the full frequency response from tens of gigahertz to DC. In this paper, we propose and test a method to create accurate models extending to DC while retaining passivity and causality. The model derived by this method is suitable for transient simulations of packaging interconnect systems.
Professional support in rural New South Wales: perceptions of new graduate occupational therapists.
OBJECTIVE
To explore the experiences of professional support among new graduates working in rural New South Wales, including the current availability of professional support and the impact of support levels on professional practice.


DESIGN
Qualitative, using semistructured face-to-face or telephone interviews.


SETTING
New graduate occupational therapists employed in public and private hospitals and community health services in rural New South Wales.


SUBJECTS
Nine new graduate occupational therapists within their first year of practice.


MAIN OUTCOME
A description of participant experiences of professional support and strategies to enhance the recruitment and retention of occupational therapists in rural areas.


RESULTS
Participants reported varied experiences of professional support and emphasised the importance of having access to a wide variety of resources. Participants highlighted that professional support could assist in developing independence and other skills. However, ultimately a lack of support resulted in decreased confidence and subsequent decreased job satisfaction among participants.


CONCLUSIONS
The findings suggest that greater effort should be directed to ensuring that all new graduates have access to professional support, including structured supervision, and that strategies be explored and adopted to ensure that this occurs.