Chances, counterfactuals and similarity

John Hawthorne in a recent paper takes issue with Lewisian accounts of counterfactuals, when relevant laws of nature are chancy. I respond to his arguments on behalf of the Lewisian, and conclude that while some can be rebutted, the case against the original Lewisian account is strong. I develop a neo-Lewisian account of what makes for closeness of worlds. I argue that my revised version avoids Hawthorne’s challenges. I argue that this is closer to the spirit of Lewis’s first (non-chancy) proposal than is Lewis’s own suggested modification

The influence of laser hardening on wear in the valve and valve seat contact

In internal combustion engines it is important to manage the wear in the valve and valve seat contact in order to minimise emissions and maximise economy. Traditionally wear in this contact has been controlled by the use of a valve seat insert and the careful selection of materials for both the valve and the insert. More recently, due to the increasing demands for both performance and cost, alternative methods of controlling the wear, and the resulting valve recession, have been sought. Using the heating effect of a laser to induce localised phase transformations, to increase hardness and wear resistance, in materials has been used since the 1970s, however it is only in recent years that it has been able to compete with more established surface treatment techniques, particularly in terms of cost, as new laser hardware has been developed. In this work, a laser has been used to treat the valve seat area of a cast iron cylinder head. In order to optimise the laser parameters for use on the head, preliminary tests were carried out to investigate the fundamental wear characteristics of untreated cast iron and also cast iron with a range of laser treatments. Previous work has identified the predominant wear mechanism in the valve and valve seat contact as impact on valve closure. Two bespoke test machines, one for testing basic specimens and one for testing components, were used to identify the laser parameters most likely to yield acceptable results when applied to a cylinder head to be used in a fired dynamometer test. © 2009 Elsevier B.V. All rights reserved

What's metaphysical about metaphysical necessity?

I begin by contrasting three approaches one can take to the distinction between the essential and accidental properties: an ontological, a deflationary, and a mind-dependent approach. I then go on to apply that distinction to the necessary a posteriori, and defend the deflationist view. Finally I apply the distinction to modal truth in general and argue that the deflationist position lets us avoid an otherwise pressing problem for the actualist: the problem of accounting for the source of modal truth

Web Single Sign-On Authentication using SAML

Companies have increasingly turned to application service providers (ASPs) or Software as a Service (SaaS) vendors to offer specialized web-based services that will cut costs and provide specific and focused applications to users. The complexity of designing, installing, configuring, deploying, and supporting the system with internal resources can be eliminated with this type of methodology, providing great benefit to organizations. However, these models can present an authentication problem for corporations with a large number of external service providers. This paper describes the implementation of Security Assertion Markup Language (SAML) and its capabilities to provide secure single sign-on (SSO) solutions for externally hosted applications

A history of Beverly, Massachusetts (for use in junior high schools).

Thesis (Ed.M.)--Boston Universit

Wheel/Rail Contact Isolation Due to Track Contamination

An experimental study has been carried out to investigate the effect of sanding on the electrical isolation of a wheel/rail contact. Sand is applied to the wheel/rail interface to increase adhesion in both braking and traction. Train detection, for signalling purposes, can be by means of track circuits. Signalling block occupancy is triggered by the wheelset of the train ‘shorting out’ the track circuit. Sand in the wheel/rail interface means that contact between the wheelsets and the track may be compromised, inhibiting train identification. Static tests were performed using sections cut from wheels and rail and dynamic tests on a twin disc machine where rail and wheel steel discs are loaded together and driven under controlled conditions of rolling and slip. The electrical circuit used was a simplified simulation of the TI21 track circuit. The application of sand was carried out under a range of mild and severe test conditions. The results indicated that a transition exists in the amount of sand applied, below which there is a measurable, but not severe, change in voltage, but above which the contact conductance decreases by an order of magnitude. A model of electrical isolation has been developed assuming either full disc separation by a sand layer or partial disc contact with some sand present. Idealisations inherent in both test methods mean that they represent a severe case. Given these limitations, it is likely that the test methods, at their present stage of development, should be used as a means to qualitatively assess the relative effects on electrical isolation of different contaminants

Teaching and Professional Fellowship Report 2002/3: Colour and Computing

An exploration of new teaching and learning methodologies relating material colour use to digital colour and the computer's speed, control, 'sensitivity' and new possibilities to develop colour ideas of practical use in the studio

Democracy, free speech and TV: the case of the BBC and the ProLife Alliance

Freedom of political expression generally receives a very high degree of protection from the courts. Political expression in the UK’s broadcast media, by comparison, receives far lower levels of protection. This has been graphically demonstrated recently by the decision of the House of Lords in R (on the application of the ProLife Alliance) v BBC in which a majority of their Lordships upheld a refusal by the BBC and independent broadcasters to transmit a Party Election Broadcast by the ProLife Alliance, depicting an abortion, prior to the 2001 general election. It will be argued that this decision is inconsistent with the jurisprudence underlying the free speech right and with the Article 10 case law of the European Court of Human Rights. In particular it will be argued that the court failed to have due regard to the type of expression at issue in the case resulting in an inadequate assessment of the proportionality of the restriction

Identity and identification in Azouz Begag’s Le Gone du Chaâba and Béni ou le paradis privé

"Man is human only to the extent to which he tries to impose his existence on another man in order to be recognised by him [...] It is on that other being, on recognition by that other being, that his own human worth and reality depend." (Fanon 216-17)The dependence of one’s “human worth and reality” on mutual recognition, highlighted by Frantz Fanon in his seminal text Black Skin White Masks, first published in 1952, plays a central role in the construction of identity in Azouz Begag’s first two novels, Le Gone du Chaâba and Béni ou le paradis privé, published in 1986 and 1989 respectively. Using contemporary post-colonial criticism to carry out a close reading of these two texts, this article will take into account the memory of the Algerian War of Independence (1954-1962), which marked Algeria’s independence from French colonial rule, and its connection to France’s current attitude towards ethnic difference. Subsequently, the effect of these factors on considerations of contemporary Franco-Algerian selfhood will be examined, and the analysis will go on to demonstrate how an Algerian presence in France, forty-eight years after the end of the Algerian War, continues to come into conflict with the French Republic’s constitutional definition of nationhood, which favours unity of the nation by uniformity rather than an embracing of multiple identities