Lithium ion mobility in poly(vinyl alcohol) based polymer electrolytes as determined by 7Li NMR spectroscopy

Solvent-free polymer electrolytes based on poly(vinyl alcohol) (PVA) and LiCF₃SO₃ have shown relatively high conductivities (10⁻⁸-10⁻⁴ S cm⁻¹), with Arrhenius temperature dependence below the differential scanning calorimeter (DSC) glass transition temperature (343 K). This behaviour is in stark contrast to traditional polymer electrolytes in which the conductivity reflects VTF behaviour. ⁷Li nuclear magnetic resonance (NMR) spectroscopy has been employed to develop a better understanding of the conduction mechanism. Variable temperature NMR has indicated that, unlike traditional polymer electrolytes where the linewidth reaches a rigid lattice limit near T_g, the lithium linewidths show an exponential decrease with increasing temperature between 260 and 360 K. The rigid lattice limit appears to be below 260 K. Consequently, the mechanism for ion conduction appears to be decoupled from the main segmental motions of the PVA. Possible mechanisms include ion hopping, proton conduction or ionic motion assisted by secondary polymer relaxations.

Producing the market for alcohol : the Victorian example

This article analyses three important inquiries into alcohol licensing in Victoria from 1965 to 1986. It argues that each inquiry was directed to produce a market for alcohol, but the 1986 inquiry, in particular, was directed to produce the conditions for the Night-time Economy. Since the mid-twentieth century, Victoria was considered a bell weather state in relation to alcohol licensing and this was increasingly the case when it comes to the state retreating from control over licensing conditions. From the end of six o'clock closing to the 24 hour city, the inquiries transformed the issues related to alcohol from the problems associated with alcohol consumption to the treatment of alcohol as just another consumer commodity.

Alcohol expectancies and drinking refusal self-efficacy mediate the association of impulsivity with alcohol misuse

Background: Recent work suggests that 2 biologically based traits convey risk for alcohol misuse: reward sensitivity ⁄ drive and (rash) impulsiveness. However, the cognitive mechanisms through which these traits convey risk are unclear. This study tested a model predicting that the risk conveyed by reward sensitivity is mediated by a learning bias for the reinforcing outcomes of alcohol consumption (i.e., positive alcohol expectancy). The model also proposed that the risk conveyed by rash impulsiveness (RI) is mediated by drinkers’ perceived ability to resist alcohol (i.e., drinking refusal self-efficacy).
Methods: Study 1 tested the model in a sample of young adults (n = 342). Study 2 tested the model in a sample of treatment-seeking substance abusers (n = 121). All participants completed a battery of personality, cognitive, and alcohol use questionnaires and models were tested using structural equation modeling.
Results: In both studies, the hypothesized model was found to provide a good fit to the data, and a better fit than alternative models. In both young adults and treatment-seeking individuals, positive alcohol expectancy fully mediated the association between reward sensitivity and hazardous alcohol use. For treatment seekers, drinking refusal self-efficacy fully mediated the association between RI and hazardous drinking. However, there was partial mediation in the young adult sample. Furthermore, neither trait was directly associated with the other cognitive mediator.
Conclusions: The hypothesized model was confirmed on a large sample of young adults and replicated on a sample of treatment-seeking substance abusers. Taken together, these findings shed further light on the mechanisms through which an impulsive temperament may convey risk for alcohol misuse.

The prevalence of work-related deaths associated with alcohol and drugs in Victoria, Australia, 2001 - 6

To describe the presence of alcohol, cannabis and amphetamines in work-related injury deaths in Victoria, 2001–6, an observational study of work-related deaths reported to the State Coroner's Office, Victoria, Australia was conducted. Case and postmortem forensic toxicology data were obtained from the National Coroner's Information System for work-related injury deaths with positive toxicology screens. Over 6 years there were 43 worker deaths in a total of 355 unintentional work-related injury deaths. The coroner mentioned the presence of alcohol/drugs in 22 of the 43 worker deaths with positive toxicology screens. Toxicology screens were positive for alcohol and/or drugs in 79 work-related deaths overall. Overall, alcohol was present in 26 (7%) work-related deaths and cannabis or amphetamines in 20 (6%). Incidents were mainly transport related. Alcohol and/or drugs were present in a significant portion of work-related deaths. Research is needed to determine the relative contribution of alcohol and drugs compared with other contributing factors to work-related deaths.