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11. Simulations of earth's local particulate environment

Author

Mackay, Neil G.

Subjects
551.5, QC Physics
Abstract

Since the dawn of the space age the near earth environment has been becoming increasingly more cluttered with man made products. In recent years there has been a growing fear that the size of this population is approaching a critical threshold. If the population should pass this threshold there would follow a catastrophic series of collision related breakups resulting in a space environment too 'dirty ' to make further satellite launches feasible. The situation is further aggravated by the existence of natural cosmic dust passing through near Earth space. The broad aim of the project was to help achieve a better understanding of the near Earth cosmic dust and space debris environment. Specifically the aim was to test existing theories about the dust and debris populations by the use of modelling, experiments and of actual data taken from space exposed materials, from the Long Duration Exposure Facility (LDEF). Two independent computer models were created. The first model simulates impacts on LDEF from cosmic dust particles. The second model simulates impacts on LDEF from space debris. The models allow the researcher to vary certain parameters about debris and dust populations. The models will then predict, from the researcher's defined parameters, the quantity and distribution of impacts expected on LDEF. These predictions can then be compared with the data gathered from microscopic examination of LDEF materials. A number of possible scenarios were investigated in this manner and their strengths and weaknesses assessed in terms of how well they satisfied the LDEF data. In addition an experimental program using a light gas gun and an electrostatic accelerator to produce hypervelocity impact craters was initiated. Ways of attaining more information about individual impact events by study of the impact crater morphology were investigated.

Published
1994
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13. Simulations of earth's local particulate environment

Author

Mackay, Neil G

Abstract

Since the dawn of the space age the near earth environment has been becoming increasingly more cluttered with man made products. In recent years there has been a growing fear that the size of this population is approaching a critical threshold. If the population should pass this threshold there would follow a catastrophic series of collision related breakups resulting in a space environment too 'dirty ’ to make further satellite launches feasible. The situation is further aggravated by the existence of natural cosmic dust passing through near Earth space. The broad aim of the project was to help achieve a better understanding of the near Earth cosmic dust and space debris environment. Specifically the aim was to test existing theories about the dust and debris populations by the use of modelling, experiments and of actual data taken from space exposed materials, from the Long Duration Exposure Facility (LDEF). Two independent computer models were created. The first model simulates impacts on LDEF from cosmic dust particles. The second model simulates impacts on LDEF from space debris. The models allow the researcher to vary certain parameters about debris and dust populations. The models will then predict, from the researcher's defined parameters, the quantity and distribution of impacts expected on LDEF. These predictions can then be compared with the data gathered from microscopic examination of LDEF materials. A number of possible scenarios were investigated in this manner and their strengths and weaknesses assessed in terms of how well they satisfied the LDEF data. In addition an experimental program using a light gas gun and an electrostatic accelerator to produce hypervelocity impact craters was initiated. Ways of attaining more information about individual impact events by study of the impact crater morphology were investigated.

Published
2023
Full Text
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25. Wolf Trial

Author

Mackay, Neil and Mackay, Neil

Abstract

Umberto Eco's The Name of the Rose meets Bret Easton Ellis'American Psycho in this brilliant historical epic. Inspired by an extraordinary true case - the first ever documented account of a serial killer in world history. In the second half of the 16th century Paulus Melchior lawyer academic and enlightened rationalist travels with his young assistant Willy Lessinger to the isolated German town of Bideburg where local landowner Peter Stumpf is accused of brutally murdering dozens of people. A society still trapped in a medieval mindset the townsfolk clamour for the killer to be tried as a werewolf. If their demands are met his blameless wife and children will also be executed in the most barbaric way imaginable as agents of Satan and creatures contaminated by wolf blood. Paulus and Willy must fight superstition the cruelty of those who fear what they don't understand and a zealous church determined to retain its grip on the souls of Bideburg in this compelling utterly unforgettable shocking tour de force. Praise for The Wolf Trial:'a great storyteller'Louise Welsh'First a warning. This novel isn’t for the squeamish. Then again neither was 16th century Germany yet Neil Mackay brings its crimes and cruelties heresies and horrors to life with all the manifold skills of a natural-born story-teller. A frighteningly impressive achievement. Imagine a land in which Christianity is as bloodthirsty as Isis and where the punishments heretics face make Bosch’s nightmares look timid. That’s what Neil Mackay has done here turning back to 16th century Germany and the world’s first recorded trial of a serial killer for an impeccably crafted story that also never stops rooting out answers to the question of evil.'David Robinson author of In Cold Ink'The tale is gripping the violence extreme and the storycraft utterly superb... The Wolf Trial will be one of the landmark texts of the year without a shadow of a doubt.'Sogo Magazine

Published
2016

28. Chest: plans for building

Author

MacKay, Neil V.

Subjects
Chest -- Muscles, Weight training -- Methods, Health
Published
1997

32. All the Little Guns Went Bang, Bang, Bang

Author

Mackay, Neil and Mackay, Neil

Abstract

Pearse Furlong and May-Belle Mulholland are two normal eleven year-olds meeting one summer in small town Antrim, Northern Ireland, in the early 1980s. They have little in common except a shared experience of violent, abusive parents. They form an unl

Published
2013

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