New evidence for specialised ceramic production and exchange in the southeast Arabian Iron Age

Results from a programme of PIXE-PIGME analysis of Iron Age ceramics from southeastern Arabia are presented. Compositional analysis indicates the existence of two discrete Iron Age II ceramic assemblages. A combination of geological and archaeological evidence suggests that one of these was produced in the inland oasis of al-Ain. Geological evidence in combination with previously published data on the elemental composition of southeast Iranian ceramics suggests Iran as a possible source for the other group.     

Satisfaction with Sunbelt Migration

Migration to non-metropolitan areas of high environmental amenity and low population is a lifestyle choice made by a small percentage of people on or about the age of retirement from the workforce Although the proportion of older people involved is low, their numbers are significant to host towns. An aspect of retirement migration which has received little attention by researchers in Australia is the extent to which such moves realise hoped for benefits for the migrants. This paper reports results of interviews undertaken in 1986 with 146 people who had migrated, on or about retirement, to the New South Wales north coast town of Port Macquarie. Several indicators of life and place satisfaction were used They all showed high absolute and relative levels of satisfaction. Although there was tittle dissatisfaction with the results of moves, search behaviour undertaken prior to moving and a number of personal characteristics of migrants, are analysed to explain some variance in satisfaction levels.     

TORSIONAL EFFECTS IN THE PUSHOVER-BASED SEISMIC ANALYSIS OF BUILDINGS

The general trends of the inelastic behaviour of plan-asymmetric structures have been studied. Systems with structural elements in both orthogonal directions and bi-axial eccentricity were subjected to bi-directional excitation. Test examples include idealised single-storey and multi-storey models, and a three-storey building, for which test results are available. The response in terms of displacements was determined by nonlinear dynamic analyses. The main findings, limited to fairly regular and simple investigated buildings, are: (a) The amplification of displacements determined by elastic dynamic analysis can be used as a rough, and in the majority of cases conservative estimate in the inelastic range, (b) Any favourable torsional effect on the stiff side, which may arise from elastic analysis, may disappear in the inelastic range. These findings can be utilised in the approximate pushover-based seismic analysis of asymmetric buildings, e.g. in the N2 method. It is proposed that the results obtained by pushover analysis of a 3D structural model be combined with the results of a linear dynamic (spectral) analysis. The former results control the target displacements and the distribution of deformations along the height of the building, whereas the latter results define the torsional amplifications. The proposed approach is partly illustrated and evaluated by test examples.     

A NON-PARAMETRIC APPROACH TO ATTENUATION RELATIONS

Abstract

A non-parametric multidimensional regression method is proposed for the prediction of seismic ground motion parameters. The main features which distinguish the method from standard regression procedures are: (1) The relationship between the input and output variables is not selected a priori by a prediction law, (2) an arbitrary number of input variables Can be taken into account, provided that an appropriate data base exists, and (3) the computational procedure is very simple. The results can be easily updated when new information becomes available. The method has been applied for the derivation of attenuation relations by using a combination of databases compiled by other researchers. In the majority of the cases discussed in this paper, the method was used for the prediction of horizontal peak ground acceleration as a function of magnitude and distance. In some cases, ground conditions were also taken into account. Some results on the attenuation relations of peak ground velocity and displacement, as well as Arias intensity, are also presented.