In this paper both piecewise linear and piecewise uniform approximation of probability density function are performed. For th e probability density function approximated in these ways, a compressor function is formed. On the basis of compressor function formed in this way, piecewise linear and piecewise uniform companding quantizer are designed. Design of these companding quantizer models is pe...

We present a new graph compressor that works by recursively detecting repeated substructures and representing them through grammar rules. We show that for a large number of graphs the compressor obtains smaller representations than other approaches. Specific queries such as reachability between two nodes or regular path queries can be evaluated in linear time (or quadratic times, respectively),...

An unsteady two-dimensional finite-volume solver was developed based on Van Leer’s flux splitting algorithm in conjunction with “Monotonic Upstream Scheme for Conservation Laws (MUSCL)” limiters to improve the order of accuracy and the two-layer Baldwin-Lomax turbulence model was also implemented. Two test cases were prepared to validate the solver. The computed results were compared with the e...

Online compressor washing is a promising method of preventing/ recovering the effects fouling on blades. However, proper strategies need to be implemented for online effective since it conducted when engine in operation. This study presents an experimental investigation wash fluid preheating effectiveness suction wind tunnel cascade. Crude oil was uniformly applied cascade blade surfaces using ...

The paper describes the design concept of a small, oilfree, reciprocating high pressure compressor which was particularly developed for NGV-applications (NGV = Natural Gas for Vehicles). It is field proven in several thousand installations in various parts of the world. The compressor head is also used in a small hermetically sealed compression unit for technical gases like N2, Air, Ar, He, H2,...

Geometric programming is a new optimization technique developed to solve nonlinear engineering design problems subject to either linear or nonlinear constraints. This paper outlines the procedure and illustrates its use with a series of examples. These examples include a compressor design, and a compressor transmission line problem. Geometric programming solutions not only yield optimal design ...