This paper is a study of the ventilation, cooling and refrigeration system design of the Mindola copper mine in Zambia. The challenges that were addressed varied from the restrictions imposed by an ageing infrastructure to the requirement for increasing the annual production rate, coupled to the introduction of a higher level of mechanization while maintaining acceptable conditions and limiting...

Arc motion in low voltage (240 VAC) high current (10–10 A.) current limiting-circuit breakers is dominated by arc root mobility. The mobility is influenced by the gas flow and gas composition in the contact region, but there is little experimental data on these effects. New pressure and spectral data measurement during arc movement are presented using a flexible test apparatus and an arc imagin...

We analyse the spatial clustering properties of the RASS1 Bright Sample, an X-ray flux-limited catalogue of galaxy clusters selected from the southern part of the ROSAT All-Sky Survey. The two-point correlation function ξ(r) of the whole sample is well fitted (in an Einstein-de Sitter model) by the power-law ξ = (r/r0) −γ , with r0 = 21.5 +3.4 −4.4 h −1 Mpc and γ = 2.11 −0.56 (95.4 per cent con...

A novel microprocessor interface circuit is described which can alternately emit and detect light using only an LED, two digital I/O pins and a single current limiting resistor. This technique is first applied to create a smart illumination system that uses a single LED as both light source and sensor. We then present several devices that use an LED as a generic wireless serial data port. An im...

A 5Gb/s optical receiver front-end for optical interconnection is presented in this paper. A transimpedance amplifier (TIA), limiting amplifiers (LA), output buffer and a bias circuit are integrated in deep Nwell 0.18 m CMOS technology. As the input current amplitude is 30 A, the differential output voltage is achieved to be 124 mV. The linear gain is 78.8dB and consumes 200mW under 1.8V supply...

This paper presents the design, implementation and evaluation of Limiting Greedy Connections (LGC), an active mechanism for controlling unresponsive connections and minimizing the degradation in network performance caused by bandwidth greedy applications. The primary objectives of the LGC mechanism are to limit the impact of greedy connections on a congested node, to keep a loose upper bound on...

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S of PAPERS The introductory welcome was made by Col. George M. Knauf (Patrick Air Force Base) who is also the Chairman of the Tri-Service Ad Hoc Committee on Microwave Hazards. Col. Knauf reviewed the background of the studies of these hazards and stated the arbitrary nature of the current limiting exposure rate of .01 watt/cm , Obviously, since different frequencies are absorbed by bio-

We introduce the idea of an ‘‘equi-g(r) sequence.’’ This consists of a series of equilibrium many-body systems which have different number densities r but share, at a given temperature, the same form of pair correlation function, termed ‘‘target g(r).’’ Each system is defined by a pair potential indexed by r as in ur(r). It is shown that for such a sequence a terminal density r ! exists, beyond...

The work is devoted to a numerical analysis of the MCC-type equations describing strongly nonlinear waves in a two-layer fluid. Its novelties are in adding earth rotation (Coriolis force) and an oscillating forcing imitating a tidal current over a bottom feature. Tidal forcing is represented by an oscillating bottom hill which in most cases gives a reasonable approximation for the case of a fix...