Modelling techniques for biological reaction systems: 1 Mathematical description and model representation

This paper is the first in a series of three which deals with modelling and numeric techniques for biological reaction systems. A matrix for­ ma rov1des a usef\11. method for model presentation. The matrix ensures clarity as to the compounds, processes, reaction terms and s01chio.metry compnsmg the model. It allows ready comparison of different models and facilitates incorporating the model in a computer slffiulauon program

Design and control of equalization tanks.

Includes bibliography.The objective of this investigation was to develop a control strategy for the operation of an equalization tank upstream of a waste water treatment plant which utilizes the available equalization hold-up volume in such a manner that it reduces, optimally, diurnal fluctuations in both influent flow and load rates. The influent to a wastewater treatment plant generally exhibits wide diurnal variations in both flow rate and concentration, and consequently in load rate (defined as the product of flow rate and concentration). Deviations of these parameters from steady state cause plant operating problems in areas such as aeration control (due to load rate fluctuations) settling tank overloading due to flow rate fluctuations) and/or over- or under-aeration which affects settling properties, and others

An examination of try scoring in rugby union: a review of international rugby statistics

The purpose of this study was to review some of the key statistics collected by the International Rugby Board (IRB) in their review of the game (2003) and to compare these findings in relation to previous statistical analysis studies. Primary objectives of Rugby Union where identified using the IRB statement of intent. Statistics collected by the IRB for these objectives were then compared to parallel research in other sports regarding recommendations for effective play. The IRB statistics for Rugby Union would appear to replicate previously discovered characteristics of football (Reep and Benjamin, 1968), and would seem to favour a 'long ball' style of play in order to maximise scoring success. This paper highlights the IRB findings and illustrates the possible benefits of comparison and cross referencing with previous research in other sports

An examination of try scoring in rugby union: a review of international rugby statistics

The purpose of this study was to review some of the key statistics collected by the International Rugby Board (IRB) in their review of the game (2003) and to compare these findings in relation to previous statistical analysis studies. Primary objectives of Rugby Union where identified using the IRB statement of intent. Statistics collected by the IRB for these objectives were then compared to parallel research in other sports regarding recommendations for effective play. The IRB statistics for Rugby Union would appear to replicate previously discovered characteristics of football (Reep and Benjamin, 1968), and would seem to favour a 'long ball' style of play in order to maximise scoring success. This paper highlights the IRB findings and illustrates the possible benefits of comparison and cross referencing with previous research in other sports

The High Time Resolution Universe Pulsar Survey I: System configuration and initial discoveries

We have embarked on a survey for pulsars and fast transients using the 13-beam Multibeam receiver on the Parkes radio telescope. Installation of a digital backend allows us to record 400 MHz of bandwidth for each beam, split into 1024 channels and sampled every 64 us. Limits of the receiver package restrict us to a 340 MHz observing band centred at 1352 MHz. The factor of eight improvement in frequency resolution over previous multibeam surveys allows us to probe deeper into the Galactic plane for short duration signals such as the pulses from millisecond pulsars. We plan to survey the entire southern sky in 42641 pointings, split into low, mid and high Galactic latitude regions, with integration times of 4200, 540 and 270 s respectively. Simulations suggest that we will discover 400 pulsars, of which 75 will be millisecond pulsars. With ~30% of the mid-latitude survey complete, we have re-detected 223 previously known pulsars and discovered 27 pulsars, 5 of which are millisecond pulsars. The newly discovered millisecond pulsars tend to have larger dispersion measures than those discovered in previous surveys, as expected from the improved time and frequency resolution of our instrument.Comment: Updated author list. 10 pages, 7 figures. For publication in MNRA

Population synthesis of radio and gamma-ray millisecond pulsars from the Galactic disk

We present results of a population synthesis of millisecond pulsars from the Galactic disk. Excluding globular clusters, we model the spatial distribution of millisecond pulsars by assuming their birth in the Galactic disk with a random kick velocity and evolve them to the present within the Galactic potential. We assume that normal and millisecond pulsars are standard candles described with a common radio luminosity model that invokes a new relationship between radio core and cone emission suggested by recent studies. In modeling the radio emission beams, we explore the relativistic effects of time delay, aberration and sweepback of the open field lines. While these effects are essential in understanding pulse profiles, the phase-averaged flux is adequately described without a relativistic model. We use a polar cap acceleration model for the gamma-ray emission. We present the preliminary results of our recent study and the implications for observing millisecond pulsars with GLAST and AGILE.Comment: 38 pages, 10 figures, accepted in ApJ - new versio