A week-end off: the first extensive number-theoretical computation on the ENIAC

The first extensive number-theoretical computation run on the ENIAC, is reconstructed. The problem, computing the exponent of 2 modulo a prime, was set up on the ENIAC during a week-end in July 1946 by the number-theorist D.H. Lehmer, with help from his wife Emma and John Mauchly. Important aspects of the ENIAC's design are presented-and the reconstruction of the implementation of the problem on the ENIAC is discussed in its salient points

Introduction - Professor Jim Rhodes, Founding Editor

This special edition of the Journal comprises the collection of papers presented at a conference held at the University of Strathclyde, Glasgow, to celebrate the work of Professor Jim Rhodes. The conference theme, Thin Walled Structures, encapsulates the technical field in which Professor Rhodes has been at the forefront for over 40 years. Indeed, it is appropriate that the conference bore the same name as the present Journal, which Professor Rhodes founded in 1983. The special event, held over 2 days, focussed on five specific technical themes, which Professor Rhodes has contributed to over the years, namely Cold Formed Steel (6 papers)-Chaired by Dr. Martin MacDonald, Glasgow Caledonian University; Buckling and Thin Walled Systems (7 papers)-Chaired by Professor Joe Loughlan, Loughborough University; Impact and Dynamical Systems (5 papers)-Chaired by Dr. Marcus Wheel, University of Strathclyde; Composites (5 papers)-Chaired by Professor William M. Banks, University of Strathclyde; Plates and Shells (9 papers)-Chaired by Dr. David Nash, University of Strathclyde

The context of the Local Volume: structures and motions in the nearby universe

The 6dF Galaxy Survey (6dFGS) and the 2MASS Redshift Survey (2MRS) provide the most complete maps of the large-scale structures and motions in the nearby universe. These maps have been used to reconstruct the density field in the local volume, and to predict the corresponding velocity field and the dipole of the Local Group motion.Comment: 4 pages, to appear in "Galaxies in the Local Volume", 2008, eds B. Koribalski and H. Jerjen, Springer Astrophysics and Space Science Series (proceedings of conference held in Sydney on 8-13 July 2007

AUTOMATIC DOOR DAM PROTOTYPE BASED MICROCONTROLLER ATMEGA 16

Writing of this final project aims to build a prototype system that functions to control the process of opening and closing dam’s door automatically. Making these tools also to provide information on water levels in the dam. Automatic door dam prototype based microcontroller and atmega 16 is a tool that designed specifically to simulate automatically dam doors. This tool will work in accordance with the conditions of the water level. When the water level go up, the door dam will open automatically dam the door will close when the water level drops. The method used in constructing the dam door prototype based automated ATmega 16 using the method of design that consists of several stages: (1) identification of requirements, (2) Needs Analysis, (3) design of hardware and software, (4) tool-making, (5) Testing Tool and (6) Operational Equipment. The hardware consists of (1) The minimum ATmega16 as the main controller, (2) water level sensor (water level control) as the water level detector, (3) and infrared light sensor photodiode as a detector height of the dam doors, (4) DC motors as driver door dam and (4) LCD as the viewer height and the height of the dam door. Based on the results of testing that has been done, it can be concluded that a prototype tool based automatic door ATmega 16 dams can work well in accordance with the working principles designed. The performance of the tool is observed by looking at the condition of the sensor exposed to water. If the condition of the water in the dam go up to the maximum condition, then the motor will move "open" the door dam in stages according to water conditions in the tank. If the condition of the water in the dam down to the minimum, then the motor will move "close" the door dam in stages according to water conditions in the tank and the high information and high water doors will be displayed on the LCD. There is an average percentage error of 0.15%. Keywords: Door dam, water level sensor, LCD, ATmega1

The Potential of Critical E-Applications for Engaging SMEs in E Business: A Provider Perspective

YesAgainst a background of the low engagement of SMEs in e-business this paper investigates the emergence of, and potential for, critical e-applications defined as `an e-business application, promoted by a trusted third party, which engages a significant number of SMEs by addressing an important shared business concern within an aggregation.¿ By a review of secondary data and empirical investigation with service providers and other intermediaries the research shows that such applications can facilitate the e-business engagement of SMEs. There are three key findings, namely: the emergence of aggregation specific e-business applications; the emergence of collaboratively based `one to many¿ business models; and the importance of trusted third parties in the adoption of higher complexity e-business applications by SMEs. Significantly this work takes a deliberately provider perspective and complements the already considerable literature on SME IT adoption from a user and network perspective. In terms of future research the importance of a better conceptual understanding of the impact of complexity on the adoption of IT by SMEs is highlighted

Output feedback control of linear multipass processes

An error actuated output feedback controller for a sub-class of linear multipass processes designated as 'differential unit memory' is defined. Further, the design of this controller for closed-loop stability is considered. In particular, a recently developed computationally feasible stability tesits used to present some preliminary work on this problem

Modelling the impact of alternative fare structures on train overcrowding

The Strategic Rail Authority (SRA) provides the backbone to rail regulation in Great Britain. As part of its responsibilities, the SRA monitors overcrowding on trains which it measures in terms of the proportion of passengers on trains in excess of the seat capacity for longer distance services, and with an allowance for standing passengers on shorter journeys of less than 20 minutes. Overcrowding on Britain’s railways fell during the early 1990s but has been on the increase since 1996 with particularly acute problems in the morning peak for services travelling to London. In a study conducted on behalf of the SRA we developed the PRAISE rail operations model to include penalties for overcrowding based upon journey purpose, journey time and degree of overcrowding. Using demand, fares and timetable information for an actual case study route, we examine how fares and ticketing restrictions can be set to manage demand throughout the day without significantly reducing the overall demand for rail travel

Modelling the influence of non-minimum phase zeros on gradient based linear iterative learning control

The subject of this paper is modeling of the influence of non-minimum phase plant dynamics on the performance possible from gradient based norm optimal iterative learning control algorithms. It is established that performance in the presence of right-half plane plant zeros typically has two phases. These consist of an initial fast monotonic reduction of the L2 error norm followed by a very slow asymptotic convergence. Although the norm of the tracking error does eventually converge to zero, the practical implications over finite trials is apparent convergence to a non-zero error. The source of this slow convergence is identified and a model of this behavior as a (set of) linear constraint(s) is developed. This is shown to provide a good prediction of the magnitude of error norm where slow convergence begins. Formulae for this norm are obtained for single-input single-output systems with several right half plane zeroes using Lagrangian techniques and experimental results are given that confirm the practical validity of the analysis

m6a RNA methylation: the implications for health and disease

The recent resurgence of interest in m6a has been spurred by some intriguing findings detailing the effects and dynamics of this epigenetic modification. The m6a modification is a highly reactive and fluid modification which can respond rapidly to a broad variety of stimuli, and translate these signals into cellular activity. The little information that has been established on its functional capacity has opened up many new avenues of research and has tremendous implications for several fields of study. Here we outline the breakthroughs which have led to the resurgence of interest in this modification and discuss the effects and potential they represent in terms of control in the immune system, viral replication and infection, as well as the occurrence and progression of cancer