An optimisation procedure for twin screw compressor design is described, which is based on an analytical algorithm for rotor profile generation combined with a differential model of the fluid flow and thermodynamic processes within the machine. Rotor profiles are generated from a rack which have both stronger female rotor lobes and higher displacement. Compressors thus designed have higher deli...

The majority of current micro-scale gas chromatography (μGC) systems focus on air sampling to detect volatile organic compounds (VOCs). However, purging the VOCs from a water sample using microsystems is an unchartered territory. Various organic compounds used in everyday life find their way to water bodies. Some of these water organic compounds (WOCs) persist or degrade slowly, threatening not...

Abstract This paper explores theoretically the formation of a system cities in which ports affect spatial location and size cities. We use complex systems economic geography approach to generate 2D cellular automata simulate landscape urban agglomerations based on different configurations port locations. The dynamics model shows emergence classical city-size distributions number their layout af...

For the problem of gas accumulation in product bunker a company’s coal processing plant, three different ventilation schemes are proposed. The first one opens rectangular air inlet louvers on wall and adds fans top for exhaust; second sets six windows evenly natural ventilation; third sends to interior through small holes distributed pipes exhaust ports wall. Finally, effect management scheme i...

For example, for problem of building a software system from modules, the components are a modules; the ports are the variables which need values or provide values; the constraints are descriptions of the number and types of values needed, or constraints about the compatibility of one module with another; and the description of the desired configuration is the user’s description of what the soft...

In very large clusters it is not possible to get Ethernet-switches that are large enough to support the whole cluster, thus a configuration with multiple switches are needed. This work seeks to evaluate the interconnection strategies for a new 300+ CPU cluster at the University of Southern Denmark. The focal point is a very inexpensive switch from D-Link which unfortunately offers only 24 Gb po...

The effects of various parameters on the hovering performance of an annular lift fan aircraft are investigated by using numerical scheme. The pitch angle, thickness, aspect ratio (chord length), number of blades, and radius of duct inlet lip are explored to optimize the figure of merit. The annular lift fan is also compared with a conventional circular lift fan of the same features with the sam...

Chromatographic separations are widespread in the fine chemicals and pharmaceutical industries for the downstream processing of complex mixtures with similar thermodynamic properties. In recent years, continuous chromatographic processes, in particular Simulated Moving Bed (SMB) processes are increasingly applied in industry. SMB processes are characterized by a counter-current movement of the ...

Status of this Memo This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind. Distribution of this memo is unlimited. Abstract The General Switch Management Protocol (GSMP), is a general purpose protocol to control an ATM switch. GSMP allows a controller to establish and release connections across the switch; add and delete leaves on...

The acoustic attenuation performance of perforated dissipative circular expansion chambers with inlet/outlet extensions is investigated. The eigenvalues and eigenfunctions of the sound field are analytically determined in the extended inlet/outlet circular ducts, upstream/downstream end annular dissipative chambers, and the central perforated dissipative expansion chamber. Utilizing the continu...