Fabrication of free-standing ordered fluorescent polymer nanofibres by electrospinning

The authors are grateful to the Engineering and Physical Sciences Research Council for financial support.We demonstrate a static fabrication approach to make free-standing ordered arrays of fluorescent nanofibres through control of the transverse electrospinning field. The alignment and the density of the nanofibre arrays are optimised by careful design of both the source and collector electrode geometries which can control the transverse electric field over the full path of the jet. In doing so, we fabricate suspended fluorescent nanofibres with an aspect ratio of 10(4), and with a substantially increased density and order parameter (by a factor of similar to 10 compared to random deposition). Electrostatic modelling suggests that the field distribution of the component is the main contribution to the ordering between the plates. This method offers increased efficiency for the creation of ordered fibres collected over a small area and the characterisation of their photoluminescent properties.Publisher PDFPeer reviewe

Due Process Hearing Officers: Characteristics, Needs, and Appointment Criteria

This is the publisher's version, also found here: http://sped.org/Characteristics and training needs of due process hearing officers in North Carolina were surveyed. It was found that current regulations governing appointments of hearing officers are insufficient to ensure appointment of qualified and impartial persons. Criteria were analyzed and suggestions for training and appointments are made

Signature of nearly icosahedral structures in liquid and supercooled liquid Copper

A growing body of experiments display indirect evidence of icosahedral structures in supercooled liquid metals. Computer simulations provide more direct evidence but generally rely on approximate interatomic potentials of unproven accuracy. We use first-principles molecular dynamics simulations to generate realistic atomic configurations, providing structural detail not directly available from experiment, based on interatomic forces that are more reliable than conventional simulations. We analyze liquid copper, for which recent experimental results are available for comparison, to quantify the degree of local icosahedral and polytetrahedral order

Procedural Due Process: The Two-edged Sword That the Untrained Should Not Unsheath

The issue of procedural due process is examined in this article by first analyzing the associated legal requirements of P.L. 94-142 and then identifying the "triggers" which professionals and parents can use to initiate a due process hearing. Problems and unresolved issues associated with interpreting and applying due process safeguards in terms of initiating, conducting, and governing the hearing and hearing officer are discussed. The concluding section of the article identifies specific training implications and creeds of due process hearing officers