NG-migration into double-base inhibitors. II. Diffusion

The maximum sorption of nitroglycerine (NG) in polymeric material was measured in Part I. The results of the sorption is used to determine the average diffusion coefficient for each polymer, utilizing Fick's second law. These values are compared to the chlorine content in the polymer backbone to ascertain whether the chlorine has any influence in lowering the diffusion coefficient.Articl

NG-migration into double-base inhibitors. I. Sorption

Double-base propellants are inhibited with polymeric material to restrict the burning surface. The energetic plasticizer may migrate out of the propellant into the inhibitor. This may then cause the inhibitor to deteriorate. Thus, the measurement of the amount of energetic plasticizer that migrates into the inhibitors is important. Sorption measurements are done using a 'sandwich' test. The data obtained are used in an empirical formula to calculate the maximum amount of energetic plasticizer that will be absorbed by a particular polymer. The validity of the formula is confirmed.Articl

Sedimentary development and correlation of Late Quaternary terraces in the Kyrenia Range, northern Cyprus, using a combination of sedimentology and optical luminescence data

This study focuses on the younger of a series of Quaternary terraces along the flanks of the Kyrenia Range in northern Cyprus, specifically the Kyrenia (Girne) and the Koupia terraces. The Kyrenia (Girne) terrace is tentatively correlated with oxygen isotope stage 5 (125 Ka), and the Koupia terrace with oxygen isotope stage 3 (<50 Ka). Along the northern flank of the range, the Kyrenia (Girne) terrace deposits (5–20 m above modern sea level) typically begin with a basal lag conglomerate and then pass upwards into shallow-marine calcarenites and then into variable aeolianites, paleosols and fluvial deposits (up to 20 m thick). In contrast, the Koupia terrace (<2 m above modern sea level) consists of aeolianites and shallow-marine calcarenites (up to 8 m thick). The equivalent deposits along the southern flank of the range are entirely non-marine fluvial mud, sands and conglomerates. The marine to continental terrace systems can be tentatively correlated based on mapping, height above modern sea level and sedimentary facies. However, variable preservation and patchy exposure require such correlations to be independently tested. To achieve this, a portable optically stimulated luminescence (OSL) reader was used to determine the luminescence characteristics of the two terrace systems. Luminescence profiles show major differences in luminescence characteristics between the two terrace depositional systems, which can be related to sedimentary processes, provenance and age. These features allow sections in different areas to be effectively correlated. Individual sections show luminescence properties that are generally consistent with an expected up-sequence decrease in age. However, the younger Koupia terrace deposits show higher luminescence intensities compared with the older Kyrenia (Girne) terrace deposits. This can be explained by multiple phases of reworking of the Kyrenia (Girne) terrace deposits, which changed the luminescence characteristics of the sediment. The use of the portable OSL reader is therefore an effective means of correlating Late Quaternary terrace deposits in northern Cyprus and probably also elsewhere

Insights on topography development in the Vasilikós and Dhiarizos valleys, Cyprus, from integrated OSL and landscape studies

Given the long history of human occupation on Cyprus, and the intensely disturbed and eroded nature of its landscape, the present-day topography has been linked to 102-3 years of human settlement and land use. Luminescence dating methods provide a chronological framework to interpret landscape processes and human-environmental interactions over this timescale, and coupled with landscape studies in the Vasilikós and Dhiarizos valleys, the means to test this assumption. The first case study examines the landscape in the Vasilikós valley, populated and exploited with regard to its natural resources since the Neolithic. The second case study examines the landscape around the Chalcolithic settlement of Souskiou-Laona where the underlying geology, geomorphology and environment contributed to the choice of site. The luminescence chronologies reported herein suggest that modifications in the first-order catchment hydrology occurred over timescales in excess of 10^3 years. It is shown that the present-day topography in Cyprus was initiated in the latest Pliocene-Pleistocene, as a result of pronounced uplift of the island and the environmental conditions which prevailed, and that only minor modifications to this first-order topography have occurred since,with the re-working, and re-deposition of Early - Middle Pleistocene sediments over timescales of both 10^2-3 and 10^4-5 years

Monitoring hospital services An application of Diagnosis Related Groups to hospital discharge data in England and Wales

SIGLEAvailable from British Library Document Supply Centre- DSC:q89/16331(Monitoring) / BLDSC - British Library Document Supply CentreGBUnited Kingdo