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An Analysis Of Printed Circuit Boards During Reflow Soldering., Paul Barry
An Analysis Of Printed Circuit Boards During Reflow Soldering., Paul Barry
Theses
Electronic manufacturing is currently one of the fastest growing industrial areas. This is due to the rapid advances in the computer and telecommunications sectors. Due to these advances, new surface mount devices have been developed to achieve greater miniaturisation at lower costs. As a result, a new surface mount technology has been developed to mount these devices onto printed circuit boards. However, problems exist with aspects of this process, principally open solder joints which result from circuit board warpage. The aim of this thesis is to undertake a) both an experimental and theoretical investigation of the reflow solder process and …
The Electrodynamic Levitation Of A Collar : Analysis, Experimentation And Simulation, Philip Nixon
The Electrodynamic Levitation Of A Collar : Analysis, Experimentation And Simulation, Philip Nixon
Theses
This dissertation describes various methods of maintaining a collar levitated in a vertical axis, using the well-known principle of electromagnetic induction between two circuits. The advantages of closing the magnetic loop around the collar, to obtain large radial flux cutting the collar and, therefore, large lifting forces for a given induced current, are considered in depth.
The ideal magnetic circuit and the equivalent electrical circuit are used in developing a model for two topologies of core (both an open and closed-circuit core) levitating a nonmagnetic conducting collar above a coil. Various affects that degrade the performance of the levitation rig …
The Treatment Of Vegetable Processing Waste Water Using A Pilot Scale Sequencing Batch Reactor Activated Sludge Process, Peter Hassett
The Treatment Of Vegetable Processing Waste Water Using A Pilot Scale Sequencing Batch Reactor Activated Sludge Process, Peter Hassett
Theses
The SBR process is a discontinuous, unsteady state process and has developed popularity in many countries assisted by reliable control technology for example programmable logic control. A typical SBR installation achieves equalisation, aeration and clarification of batches of wastewater on a timed sequence in one basin. This is in contrast to a volume sequenced process such as the conventional continuous stirred tank reactor where individual treatment objectives are met in separate basins. Advantages include, flexability, minimum energy input, consistent effluent quality and inhibition of filament organism growth by properly controlling substrate concentration and aeration sequences. Nitrification, denitrification and Bio-P removal …