May it Please Your Honor : Letters of Petition as Historical Evidence in an African Colonial Context

This paper presents some preliminary conclusions drawn from an ongoing project which aims to collect and collate letters of petitions in colonial Nigeria as primary source for historians and other scholars. The goal is to show the potential use of petitions as a foundation for gauging African reactions and responses to colonialism focusing on the petitions that emerged during the Second World War in colonial Eastern Nigeria. The paper is based on the collection of petitions located at the National Archives of Nigeria at Enugu written by people living in the rural and urban areas in colonial Eastern Nigeria during the Second World War. Mainly addressed to District Officers in Colonial Eastern Nigeria from within the region, they reflect the concerns of individuals and groups as they relate to the crisis engendered by the Second World War and the policies and controls imposed by officials to bolster the British war effort

Development of an explicit multigrid algorithm for quasi-three-dimensional viscous flows in turbo-machinery

A rapid quasi three-dimensional analysis was developed for blade-to-blade flows in turbomachinery. The analysis solves the unsteady Euler or thin layer Navier-Stokes equations in a body-fitted coordinate system. It accounts for the effects of rotation, radius change, and stream-surface thickness. The Baldwin-Lomax eddy-viscosity model is used for turbulent flows. The equations which are solved by a two-stage Runge-Kutta scheme made efficient by use of vectorization, a variable time-step, and a flux-based multigrid scheme, are described. A stability analysis is presented for the two-stage scheme. Results for a flat-plate model problem show the applicability of the method to axial, radial, and rotating geometries. Results for a centrifugal impeller and a radial diffuser show that the quasi three-dimensional viscous analysis can be a practical design tool

Evil and Superstition in Sub-Saharan Africa: Religious Infanticide and Filicide

A distinct category of women has been identified in different parts of Sub-Saharan Africa, those who commit extreme forms of violence and murder against their children in order to fulfil their religious obligations or to protect themselves from perceived magico-spiritual harms from their children. The whole of Africa is currently witnessing a heightened level of witch-hunting. Historically, some African witch-hunting incidents are triggered by witch-doctors who are keen to protect their clients from any perceived diabolical effects of witches while others are triggered by mere gossips or rumours from neighbours. However, dramatized preaching on witchcraft by revivalist Christian prophets and prophetesses whose major occupations are the ‘sale’ of exorcisms to the bewitched has become the latest trend in the region. These prophets and prophetesses are keen to teach their followers the importance of the ‘Thou shalt not suffer a witch to live’ biblical passage in their lives as well as how ‘the Kingdom of God suffereth violence’. By means of case study analysis, this paper presents a new pattern of evil that is perpetrated in the form of abandonment, torture, mutilation and murders of children by their mothers, those women who should protect their children from such evils. It also presents the cases of another group of women (prophetesses) who preach and deliver prophecies purportedly from God about particular children who are the alleged witches. This latter category also decides the nature of evil to be committed against such children – all in the name of fulfilling their religious obligations

Hadron production in high energy neutrino interactions

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Hypercharge exchange reactions in a triggered bubble chamber

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Comparison of two- and three-dimensional flow computations with laser anemometer measurements in a transonic compressor rotor

Two and three dimensional inviscid solutions for the flow in a transonic axial compressor rotor at design speed are compared with probe and laser anemometers measurements at near-stall and maximum-flow operating points. Experimental details of the laser anemometer system and computational details of the two dimensional axisymmetric code and three dimensional Euler code are described. Comparisons are made between relative Mach number and flow angle contours, shock location, and shock strength. A procedure for using an efficient axisymmetric code to generate downstream pressure input for computationally expensive Euler codes is discussed. A film supplement shows the calculations of the two operating points with the time-marching Euler code

Finite element analysis of inviscid subsonic boattail flow

A finite element code for analysis of inviscid subsonic flows over arbitrary nonlifting planar or axisymmetric bodies is described. The code solves a novel primitive variable formulation of the coupled irrotationality and compressible continuity equations. Results for flow over a cylinder, a sphere, and a NACA 0012 airfoil verify the code. Computed subcritical flows over an axisymmetric boattailed afterbody compare well with finite difference results and experimental data. Interative coupling with an integral turbulent boundary layer code shows strong viscous effects on the inviscid flow. Improvements in code efficiency and extensions to transonic flows are discussed