Materials handling with application to a foundry

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Methods for stabilizing high Reynolds number Lattice Boltzmann simulations

The Lattice Boltzmann Method (LBM) is a simple and highly efficient method for computing nearly incompressible fluid flow. However, it is well known to suffer from numerical instabilities for low values of the transport coefficients. This dissertation examines a number of methods for increasing the stability of the LBM over a wide range of parameters. First, we consider a simple transformation that renders the standard LB equation implicit. It is found that the stability is largely unchanged. Next, we consider a stabilization method based on introducing a Lyapunov function which is essentially a discrete-time H-function. The uniqueness of an H-function that appears in the literature is proven, and the method is extended to stabilize some of the more popular LB models. We also introduce a new method for implementing boundary conditions in the LBM. The hydrodynamic fields are imposed in a transformed moment space, whereas The non-hydrodynamic fields are shifted over from neighboring nodes. By minimizing population gradients, this method exhibits superior numerical stability over other widely employed schemes when tested on the widely-used benchmark of incompressible flow over a backwards-facing step

NEEMIS : text of governors presentation of October 6, 1975

Prepared in association with the Alfred P. Sloan School of ManagementThis is the text of a presentation given to the six New England governors on November 7, 1975. The presentation focused on explaining how the New England Energy Management Information System (NEEMIS) has helped the region, what it is, how it will continue to help the region, what unique technology made it possible, what shall be done in the future, and a demonstration of one application

Speech act theory and the teaching of literature

Speech act theory is a relatively recent subject of study in the philosophy of language and in the philosophy of the mind. The movement appears to have commenced in 1962 with J.L. Austin's How to do Things with Words. The impetus, however, came with the writings of John Searle, beginning with Speech Acts in 1969. -- To philosophers who study this phenomenon, the notion of intentionality is seen as a major component of any work of language used for human communication. Common background experiences and knowledge of speech acts of the common culture are other items of importance in the interpretation of an utterance. -- Because a literary work is a work in language, and since the purpose of language is communication, the literary work is viewed as discourse, and thereby subject to interpretation using speech act theory. The literary text becomes the mediary between writer and reader. The reader completes the speech act with his interpretation of the writer's utterance made manifest by the text. -- The major purpose of this paper has been to argue that a theory of speech acts is tenable as an approach to the interpretation and analysis of literary works at the classroom level. To that end, an overview of speech act theory is attempted, as well as a positing of literature as discourse. The conclusion proposed is that prior to any analysis of a literary work, along the lines of the New Criticism for instance, there must be an understanding of the utterance, and this is best accomplished from the point of view of speech act theory

Chaotic maps and pattern recognition - the XOR problem

In this report, we describe a novel application of the Baker's map. We demonstrate that the chaotic properties of this map can be used to implement basic operations in Boolean logic. This observation leads naturally to the possibility of new computational models and implementations for conventional computational systems. Here we show that by considering the variation of the fractal dimension of its attractor, and using varying parameter values as inputs, the generalised Baker's map can be used as a natural exclusive OR (XOR) gate. Further, this map can also be used to create other logical functions such as the AND gate. The efficacy of our results are demonstrated by means of a concrete application; namely by designing, to the best of our knowledge, for the frst time, a half-adder that is constructed entirely by utilising chaotic dynamics