Innovation and Australian Industrial Relations by Chris Fisher, (Croom Helm,Australia, 1983) pp . 226, $24.95 [hb], $12.95 [pb]

This paper is concerned with one aspect of the assessment of a new technology — describing the temporal utilisation of the technology in use. The technologies that are considered here are barium meal radiology and fibre optic endoscopy, two major diagnostic procedures for the upper gastrointenstinal tract. The data employed relate to private fee-for-service medicine in Australia and have been collected under Australia's health insurance arrangements. Statistically significant differences in utilisation rates for these diagnostic procedures are found between the states of Australia. Also it is shown that per capita use of these procedures is rising at an annual rate of 2.4 per cent per annum. Although it is not possible from the data employed here to specify what factors have determined these utilisation rates, some possible explanations are considered. A secondary aspect of the paper is that it demonstrates how data from the Health Insurance Collection can be analysed despite the changes to health insurance arrangements introduced by the Commonwealth government since 1975–76.     

关于0/1背包问题的粒子群优化算法

背包问题作为运筹学中一个典型的组合优化难题,有着广泛的应用背景,有许多不同的求解方法。给出了基于粒子群优化算法的一种求解方法,利用遗传算法的部分思想将粒子群优化算法应用到0/1背包问题中,得到了比较满意的计算结果。     

Control over π-π stacking of heteroheptacene-based nonfullerene acceptors for 16% efficiency polymer solar cells

Nonfullerene acceptors are being investigated for use in polymer solar cells (PSCs), with their advantages of extending the absorption range, reducing the energy loss and therefore enhancing the power conversion efficiency (PCE). However, to further boost the PCE, mobilities of these nonfullerene acceptors should be improved. For nonfullerene acceptors, the π–π stacking distance between cofacially stacked molecules significantly affects their mobility. Here, we demonstrate a strategy to increase the mobility of heteroheptacene-based nonfullerene acceptors by reducing their π–π stacking distances via control over the bulkiness of lateral side chains. Incorporation of 2-butyloctyl substituents into the nonfullerene acceptor (M36) leads to an increased mobility with a reduced π–π stacking distance of 3.45 Å. Consequently, M36 affords an enhanced PCE of 16%, which is the highest among all acceptor-donor-acceptor-type nonfullerene acceptors to date. This strategy of control over the bulkiness of side chains on nonfullerene acceptors should aid the development of more efficient PSCs.