Organic Geochemistry of Fatty Acids

The aims of organic geochemistry included the investigation of the distribution of specific classes of organic compounds and the rigorous identification of the individual components interred in geological materials. Assuming that the organic matter present in a rock is of biological origin, it is of particular interest to investigate classes of compounds which are present in biological systems and which have been preserved in sediments. A number of workers have isolated and identified alkanes and fatty acids in sediments; this thesis is concerned with the examination of sedimentary fatty acids

Synapse: automatic behaviour inference and implementation comparison for Erlang

In the open environment of the world wide web, it is natural that there will be multiple providers of services, and that these service provisions — both specifications and implementations — will evolve. This multiplicity gives the user of these services a set of questions about how to choose between different providers, as well as how these choices work in an evolving environment. The challenge, therefore, is to concisely represent to the user the behaviour of a particular implementation, and the differences between this implementation and alternative versions. Inferred models of software behaviour – and automatically derived and graphically presented comparisons between them – serve to support effective decision making in situations where there are competing implementations of requirements. In this paper we use state machine models as the abstract representation of the behaviour of an implementation, and using these we build a tool by which one can visualise in an intuitive manner both the initial implementation and the differences between alternative versions. In this paper we describe our tool Synapse which implements this functionality by means of our grammar inference tool StateChum and a model-differencing algorithm. We describe the main functionality of Synapse, and demonstrate its usage by comparing different implementations of an example program from the existing literature

Opportunism in buyer-supplier exchange: a critical examination of the concept and its implications for theory and practice

Claims that opportunism is widespread in the process of buyer–supplier exchange are commonplace, but direct supporting evidence for such claims is largely absent from the relevant literature. This article offers a critique of the treatment of opportunism in supply chains by re-establishing the importance of guile in the concept and investigates existing published, empirical measures of buyer and supplier opportunistic behaviour. This article offers evidence that, despite the frequency with which the concept is discussed in the literature and applied in research and the emphasis given to the risks it generates for management, opportunism with guile between buyers and suppliers appears to be rare in practice. This article is the first critical assessment of the concept’s treatment in the Operations Management field, and it argues that practitioners are currently being poorly advised with respect to the phenomenon, as well as drawing conclusions for both practitioners and researchers that differ radically from the prevailing consensus on the subject

User-centered design in brain–computer interfaces — a case study

The array of available brain–computer interface (BCI) paradigms has continued to grow, and so has the corresponding set of machine learning methods which are at the core of BCI systems. The latter have evolved to provide more robust data analysis solutions, and as a consequence the proportion of healthy BCI users who can use a BCI successfully is growing. With this development the chances have increased that the needs and abilities of specific patients, the end-users, can be covered by an existing BCI approach. However, most end-users who have experienced the use of a BCI system at all have encountered a single paradigm only. This paradigm is typically the one that is being tested in the study that the end-user happens to be enrolled in, along with other end-users. Though this corresponds to the preferred study arrangement for basic research, it does not ensure that the end-user experiences a working BCI. In this study, a different approach was taken; that of a user-centered design. It is the prevailing process in traditional assistive technology. Given an individual user with a particular clinical profile, several available BCI approaches are tested and – if necessary – adapted to him/her until a suitable BCI system is found