Metropolitan area growth: a test of export base concepts

Regional economics ; Federal Reserve Bank of St. Louis

Aeroacoustic and aerodynamic applications of the theory of nonequilibrium thermodynamics

Recent developments in the field of nonequilibrium thermodynamics associated with viscous flows are examined and related to developments to the understanding of specific phenomena in aerodynamics and aeroacoustics. A key element of the nonequilibrium theory is the principle of minimum entropy production rate for steady dissipative processes near equilibrium, and variational calculus is used to apply this principle to several examples of viscous flow. A review of nonequilibrium thermodynamics and its role in fluid motion are presented. Several formulations are presented of the local entropy production rate and the local energy dissipation rate, two quantities that are of central importance to the theory. These expressions and the principle of minimum entropy production rate for steady viscous flows are used to identify parallel-wall channel flow and irrotational flow as having minimally dissipative velocity distributions. Features of irrotational, steady, viscous flow near an airfoil, such as the effect of trailing-edge radius on circulation, are also found to be compatible with the minimum principle. Finally, the minimum principle is used to interpret the stability of infinitesimal and finite amplitude disturbances in an initially laminar, parallel shear flow, with results that are consistent with experiment and linearized hydrodynamic stability theory. These results suggest that a thermodynamic approach may be useful in unifying the understanding of many diverse phenomena in aerodynamics and aeroacoustics

Querying a regulatory model for compliant building design audit

The ingredients for an effective automated audit of a building design include a BIM model containing the design information, an electronic regulatory knowledge model, and a practical method of processing these computerised representations. There have been numerous approaches to computer-aided compliance audit in the AEC/FM domain over the last four decades, but none has yet evolved into a practical solution. One reason is that they have all been isolated attempts that lack any form of standardisation. The current research project therefore focuses on using an open standard regulatory knowledge and BIM representations in conjunction with open standard executable compliant design workflows to automate the compliance audit process. This paper provides an overview of different approaches to access information from a regulatory model representation. The paper then describes the use of a purpose-built high-level domain specific query language to extract regulatory information as part of the effort to automate manual design procedures for compliance audit

International aspects of the nitrate situation

This item was digitized by the Internet Archive. Thesis (M.B.A.)--Boston Universityhttps://archive.org/details/internationalasp00bri

No longer an orphan: evidence for appositive attachment from sentence comprehension

In this paper, we investigate the comprehension of appositive relative clauses and nominal appositives. First, we present experimental evidence that suggests that nominal appositives and appositive relative clauses behave like other adjunct phrases with respect to ambiguity resolution (Experiment 1). Second, we show that an ambiguous nominal appositive can modify a distant syntactic head as easily across an appositive relative clause as across a restrictive relative clause (Experiment 2). Last, we show that syntactic repair is as successful across an appositive relative clause or parenthetical as it is across an at-issue restrictive relative clause (Experiment 3). Taken together, our results suggest that i) appositive relative clauses and nominal appositives are syntactically sited in a fashion comparable to restrictive relative clauses and ii) appositive phrases do not substantially reduce the availability of the syntactic material that precedes the appositive phrase as might have been expected if processing an appositive involved shifting attention to a higher structure, away from local preceding constituents. These results constitute an argument from sentence comprehension for a local syntactic attachment of appositive relative clauses and nominal appositives (cf. Jackendoff 1977; Potts 2005; de Vries 2006), and against so-called orphan analyses of appositive content (e.g. Ross 1967; Haegeman 1988)