the present paper describes the designing of a thermally and economically optimum mechanical draft counter-flow wet cooling tower. the design model allows the use of a variety of packing materials in the cooling tower toward optimizing heat transfer. once the optimum packing type is chosen, a compact cooling tower with low fan power consumption is modelled within the known design variables. mor...

In designing a mechanical system, a designer uses various models of a design object . Each of the models represents a specific aspect of the design object, e.g., aspects of dynamics, hydraulics, controlling, oscillation, strength, etc. The designer refines the design object by adding properties to the models, and evaluates behaviors by calculation using the models. At the same time, since the m...

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In contrast to the classical discrete choice experiment, the respondent in a rank-order discrete choice experiment, is asked to rank a number of alternatives instead of the preferred one. In this paper, we study the information matrix of a rank order nested multinomial logit model (RO.NMNL) and introduce local D-optimality criterion, then we obtain Locally D-optimal design for RO.NMNL models in...

Traditionally database design has been taught using Entity Relationship (ER) modelling. In this paper we set out some of the problems that learners experience with the ER approach. We argue that Object Role Modelling (ORM), a design method taught at the University of Wolverhampton helps overcome these problems.

Even if Computer-Aided Geometric Design modelers are now based on powerful mathematical models for curves and surfaces, there are important needs for tools to create, analyze and modify these objects. Designing product shapes with free-form curves and surfaces is still a tedious task and modifying the shape obtained is even more difficult and, most of the time, needs recreating a part up to the...